Laser adjusting head and laser light path adjusting method using same

Abstract

The invention discloses a laser light path adjusting method, which comprises the following steps of S1, turning on a laser, measuring the total deviation power between the actual power and the rated power of the laser, and making a light spot pattern in a laser light emitting mode; s2, the spot welding position on the laser adjusting head is determined through the light spot diagram; s3, a spot welding machine is selected for spot welding; s4, measuring a deviation power change rate; s5, the total spot welding time of the spot welding machine is determined according to the total deviation power and the deviation power change rate; and S6, spot welding is conducted again through the spot welding machine, and finally the laser focus point of the laser device is located in the center of the light spot pattern in the light emitting mode. The method has the advantages that through the steps, the laser focus point of the laser is located in the center of the light spot pattern in the light emitting mode, the actual power of the laser can be infinitely close to the rated power, and power loss is reduced.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a laser adjustment head and a laser optical path adjustment method using the same. Background Art

[0002] Lasers, especially CO2 lasers, are often used in the fields of machinery, military, medical treatment, chemical industry, etc. Their structure generally includes a gas storage tube, a discharge tube coaxial with the gas storage tube, a cooling tube sleeved on the discharge tube, electrodes at both ends of the gas storage tube, an output mirror on one side of the electrode and a tail mirror on the other side. The laser power source acts on the electrode to cause the CO2 mixed gas in the discharge tube to oscillate to form a laser. Ideally, the position of the output mirror should be parallel to and coaxial with the position of the tail mirror, and the final focus of the laser is located at the center of the spot diagram, so that the laser power can be infinitely close to the rated power.

[0003] Since gas storage tubes are mostly made of glass, the glass will deform and release stress due to thermal expansion and contraction (especially during transportation). This change will change the relative position of the output mirror and the tail mirror, that is, the laser optical path changes, affecting the accuracy of the laser.

[0004] In addition, Chinese patent document CN221226812U discloses a CO2 laser spot adjustment device and a CO2 laser device including an adjustment housing and an adjustment member, wherein an optical path is provided inside the adjustment housing, and an output mirror mounting groove is provided at one end of the optical path inside the adjustment housing, the output mirror is installed inside the output mirror mounting groove, the end of the adjustment housing where the output mirror is located is connected to the tube shell of the laser, a circle of adjustment grooves is provided around the adjustment housing, a plurality of adjustment members are connected with the adjustment grooves, the diameter of the adjustment member gradually increases from bottom to top, and the other end of the adjustment housing is a light outlet. When the spot needs to be adjusted, the adjustment member is sunk to the depth of the adjustment groove, and the adjustment groove is squeezed by the adjustment member to change the angle of the housing end face.

[0005] Although the solution mentioned in this document can adjust the light spot, it also has the following problems:

[0006] 1. The extrusion force of the adjusting part is difficult to control. If the force is too large, it is easy to penetrate the end surface of the shell, causing the laser to leak;

[0007] 2. The adjustment accuracy using adjusting parts is low, and there will be large errors during adjustment.

[0008] 3. After long-term use, the connection between the adjustment part and the groove will become loose, which will also lead to a decrease in adjustment accuracy and affect the service life of the laser. Summary of the invention

[0009] The purpose of the present invention is to provide a laser adjustment head and a laser optical path adjustment method using the same, so as to solve the above technical problems.

[0010] A laser light path adjustment method comprises the following steps:

[0011] S1. Turn on the laser, measure the total deviation power between the actual laser power and the rated power, and make a spot diagram under the laser light output mode;

[0012] S2, determining the spot welding position on the laser adjustment head through the spot diagram;

[0013] S3. Use a spot welding machine for spot welding;

[0014] S4, measuring the deviation power change rate;

[0015] S5. Determine the total spot welding time of the spot welding machine by using the total deviation power and the deviation power change rate;

[0016] S6. The spot welding machine performs spot welding again, and finally the laser focal point of the laser is located at the center of the spot diagram in the light output mode.

[0017] The beneficial effect is that through the above steps, the laser focal point of the laser is located at the center of the spot diagram in the light emission mode, the actual power of the laser can be infinitely close to the rated power, and the power loss is reduced.

[0018] In some implementations, in step S1, a laser power meter is used to measure the actual power of the laser, and the power difference between the rated power and the actual power is the total deviation power.

[0019] In some embodiments, in step S2, one end of the laser adjustment head can be connected to the electrode and the other end can be connected to the output mirror and / or the tail mirror; the laser adjustment head can allow the laser light path to pass through; the laser adjustment head is circumferentially provided with a groove, a recessed portion is provided in the groove, the recessed portion has a protrusion, and the protrusion can be spot welded by a spot welder. The thickness of the protrusion can change with the spot welding of the spot welder, and the light output angle changes accordingly, thereby being able to control the laser light path.

[0020] The beneficial effects are: the laser adjustment head is spot welded by a spot welding machine, so the laser is not prone to air leakage, the sealing performance is improved, and it is easy to transport, avoiding the loosening of the adjustment part and the groove connection part in the prior art, improving the stability of the laser in the light output mode, and extending the service life of the laser.

[0021] In some embodiments, the laser adjustment head is configured as 4J29 Kovar alloy.

[0022] The beneficial effect is that when glass is used for the gas storage tube, the expansion coefficient of the material of 4J29 Kovar alloy is very close to that of glass. Therefore, after the laser adjustment head configured with 4J29 Kovar alloy is assembled with the glass gas storage tube, the influence of thermal expansion and contraction effect on its structure can be avoided to the greatest extent, so that the laser optical path remains stable.

[0023] In some embodiments, the wall thickness of the recessed portion is 0.40-0.80 mm.

[0024] In some embodiments, in step S2, there is a laser focus point in the laser light emission mode on the spot diagram, and the direction of the line connecting the laser focus point to the center point of the spot diagram is the spot welding direction.

[0025] In some embodiments, according to the spot welding direction, spot welding is performed in the spot welding direction of the protrusion accordingly, and this position is the spot welding position.

[0026] In some embodiments, in step S4, the rated spot welding power of the spot welding machine is constant, and the change value of the laser power within a certain period of time is measured, and the ratio of the change value to time is the deviation power change rate.

[0027] In some implementations, in step S5, after the total deviation power is measured, the deviation power change rate is obtained, and the ratio of the total deviation power to the deviation power change rate is the total spot welding time.

[0028] In some embodiments, in step S3, the maximum spot welding thickness of the spot welder is less than or equal to the thickness of the protrusion.

[0029] The beneficial effect is to prevent the spot welding machine from penetrating the protrusion during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A step-by-step diagram of the laser optical path adjustment method.

[0032] Figure 2 It is a cross-sectional view of the laser adjustment head of the present invention.

[0033] Figure 3 It is a light spot diagram.

[0034] Figure 4 A cross-sectional view of the convex portion.

[0035] Description of the reference numerals in the accompanying drawings:

[0036] 1. groove; 2. depression; 21. protrusion; DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the present invention, and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "two ends", "both sides", "bottom", "top" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred elements must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "superior", "inferior", "primary", "secondary" and the like are only used for descriptive purposes and can be simply used to more clearly distinguish different components, but cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 1 As shown, a laser light path adjustment method comprises the following steps:

[0041] S1. Turn on the laser, measure the total deviation power between the actual laser power and the rated power, and make a spot diagram under the laser light output mode;

[0042] S2, determining the spot welding position on the laser adjustment head through the spot diagram;

[0043] S3. Use a spot welding machine for spot welding;

[0044] S4, measuring the deviation power change rate;

[0045] S5. Determine the total spot welding time of the spot welding machine by using the total deviation power and the deviation power change rate;

[0046] S6. The spot welding machine performs spot welding again, and finally the laser focal point of the laser is located at the center of the spot diagram in the light output mode.

[0047] The beneficial effect is that through the above steps, the laser focal point of the laser is located at the center of the spot diagram in the light emission mode, the actual power of the laser can be infinitely close to the rated power, and the power loss is reduced.

[0048] Preferably, in step S1, a laser power meter is used to measure the actual power of the laser, and the power difference between the rated power and the actual power is the total deviation power.

[0049] like Figure 2 As shown,

[0050] In step S2, one end of the laser adjustment head can be connected to the electrode, and the other end can be connected to the output mirror and / or the tail mirror; the laser adjustment head can allow the laser light path to pass through; a groove 1 is arranged circumferentially on the laser adjustment head, a recessed portion 2 is arranged in the groove 1, and the recessed portion 2 has a protrusion 21, which can be spot welded by a spot welder, and the thickness of the protrusion 21 can change with the spot welding of the spot welder, and the light output angle changes accordingly, so that the laser light path can be controlled.

[0051] The beneficial effects are: the laser adjustment head is spot welded by a spot welding machine, so there will be no air leakage, the sealing performance is improved, the loosening of the original adjustment bolt is avoided, the stability of the laser in the light output mode is improved, and the service life of the laser is extended.

[0052] Preferably, the laser adjustment head is configured as 4J29 Kovar alloy.

[0053] The beneficial effect is that when glass is used for the gas storage tube, the expansion coefficient of the material of 4J29 Kovar alloy is very close to that of glass. Therefore, after the laser adjustment head configured with 4J29 Kovar alloy is assembled with the glass gas storage tube, the influence of thermal expansion and contraction effect on its structure can be avoided to the greatest extent, so that the laser optical path remains stable.

[0054] It should be noted here that the thickness (radian) of the protrusion 21 cannot be too large. If the thickness is too large, the offset of the light spot (laser focal point) will be smaller during spot welding, and the light spot will not be easy to move to the center of the light spot diagram; at the same time, the thickness (radian) of the protrusion 21 cannot be too small. If the thickness is too small, the spot welder will easily break through the adjustment head, causing air leakage. Therefore, preferably, the wall thickness of the recessed portion 22 is 0.40~0.80mm, preferably 0.55~0.60mm, and the depth of the groove 11 (that is, the distance from the upper end surface of the groove 11 to the surface of the recessed portion 22) is preferably 3.5mm±0.01mm.

[0055] like Figure 3 As shown,

[0056] Preferably, in step S2, there is a laser focus point in the laser light emission mode on the spot diagram, and the direction of the line connecting the laser focus point to the center point of the spot diagram is the spot welding direction.

[0057] For example, when the laser focus point is located on the left side of the center point of the spot diagram, the left angle of the optical path is too large.

[0058] like Figure 4 As shown,

[0059] Preferably, according to the spot welding direction on the light spot diagram, spot welding is performed in the spot welding direction of the protrusion 21 accordingly, and this position is the spot welding position.

[0060] Preferably, in step S4, the rated spot welding power of the spot welding machine is constant, and the change value of the laser power within a certain period of time is measured, and the ratio of the change value to the time is the deviation power change rate. In this embodiment, the power supply voltage of the selected spot welding machine is 220V, and the rated current is 12A. The rated spot welding power of the spot welding machine is constant, and the pressure acting on the electrode is 20-200N. For example, when the spot welding time is 10ms, the laser has a power change value of 5w, and the deviation power change rate is 0.5w / ms.

[0061] Preferably, in step S5, after the total deviation power is measured, the deviation power change rate is obtained, and the ratio of the total deviation power to the deviation power change rate is the total spot welding time.

[0062] Preferably, in step S3, the maximum spot welding thickness of the spot welding machine is less than or equal to the thickness of the protrusion 21. In this embodiment, the maximum spot welding thickness of the spot welding machine is 0.1-0.5 mm.

[0063] The beneficial effect is to prevent the spot welding machine from penetrating the protrusion 21 during operation.

[0064] The above are only some embodiments of the present invention, which are only used to illustrate the technical solution of the present invention, rather than to limit it. It should be understood that, for those skilled in the art, without departing from the creative concept of the present invention, it is possible to make improvements or substitutions according to the above description, and all these improvements and substitutions should belong to the protection scope of the appended claims of the present invention. In this case, all details can be replaced by equivalent elements, and the materials, shapes and sizes can also be arbitrary.

Claims

1. A laser optical path adjustment method, characterized in that: The steps include: S1. Turn on the laser, measure the total deviation power between the actual laser power and the rated power, and make a spot diagram under the laser light output mode; S2, determining the spot welding position on the laser adjustment head through the spot diagram; S3. Use a spot welding machine for spot welding; S4, measuring the deviation power change rate; S5. Determine the total spot welding time of the spot welding machine by using the total deviation power and the deviation power change rate; S6. The spot welding machine performs spot welding again, and finally the laser focal point of the laser is located at the center of the spot diagram in the light output mode.

2. The laser optical path adjustment method according to claim 1, characterized in that: In step S1, a laser power meter is used to measure the actual power of the laser, and the power difference between the rated power and the actual power is the total deviation power.

3. The laser optical path adjustment method according to claim 2, characterized in that: In step S2, one end of the laser adjustment head can be connected to an electrode, and the other end can be connected to an output mirror and / or a tail mirror; the laser adjustment head can allow a laser light path to pass through; a groove (1) is provided in the circumference of the laser adjustment head, a recessed portion (2) is provided in the groove (1), the recessed portion (2) has a protrusion (21), and the protrusion (21) can be spot welded by a spot welder. The thickness of the protrusion (21) can change with the spot welding of the spot welder, and the light output angle changes accordingly, thereby being able to control the laser light path.

4. The laser optical path adjustment method according to claim 3, characterized in that: The laser adjustment head is configured as 4J29 Kovar alloy.

5. The laser optical path adjustment method according to claim 4, characterized in that: The wall thickness of the recessed portion (2) is 0.40-0.80 mm.

6. The laser optical path adjustment method according to claim 5, characterized in that: In step S2, there is a laser focus point in the laser light emission mode on the spot diagram, and the direction of the line connecting the laser focus point to the center point of the spot diagram is the spot welding direction.

7. The laser optical path adjustment method according to claim 6, characterized in that: According to the spot welding direction, spot welding is performed in the spot welding direction of the protrusion (21) accordingly, and this position is the spot welding position.

8. The laser optical path adjustment method according to claim 7, characterized in that: In step S3, the maximum spot welding thickness of the spot welding machine is less than or equal to the thickness of the protrusion (21).

9. The laser optical path adjustment method according to claim 1, characterized in that: In step S4, the rated spot welding power of the spot welding machine is constant, and the change value of the laser power within a certain period of time is measured. The ratio of the change value to time is the deviation power change rate.

10. The laser optical path adjustment method according to claim 1, characterized in that: In step S5, after the total deviation power is measured, the deviation power change rate is obtained, and the ratio of the total deviation power to the deviation power change rate is the total spot welding time.

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