Focusing module of laser welding process signal detection system and laser welding system

Abstract

The invention provides a focusable module of a laser welding process signal detection system. The focusable module comprises a shell, a lens cone is arranged in the shell, a focusing coded disc is arranged on one side of the shell, a coded disc cover plate is arranged on the outer side of the focusing coded disc, a lens cone groove is formed in the middle of the lens cone, a boss sliding in the lens cone groove is arranged on the inner side of the focusing coded disc, and the boss is eccentrically arranged; the laser welding system comprises a laser welding assembly, a laser welding system switching block, an adjustable reflector module, a laser process monitoring module, an ultraviolet monitoring module and a focus-adjustable module, and the focus-adjustable module adopts the focus-adjustable module for the laser welding process signal detection system. The focusing code disc is rotated, so that the boss rotates around the axis of the focusing code disc, the lens cone is driven to do axial reciprocating motion, the position of a focusing lens in the lens cone is adjusted, an optical path is adjusted, the stability and accuracy of the system are improved, the focus position of the optical system is adjusted, and when a signal received by a detector is maximum, the focus position is determined.

Description

Technical Field

[0001] The invention relates to the technical field related to optical equipment, and in particular to an adjustable focus module of a laser welding process signal detection system and a laser welding system. Background Art

[0002] As human society enters the information age, detection technology has been applied to almost all industries. Through corresponding detection technology, people can achieve qualitative understanding and quantitative grasp of the information contained in the object being tested. In the laser industry, the process signal detection system is used to monitor whether the welding is qualified. Inside the process signal detection system, whether the focal position of the optical system is on the surface of the detection surface determines the strength of the signal received by the detector, that is, the position of the lens inside the system must be in the position specified by the optical design. However, in practice, the machining accuracy errors of all parts and the cumulative errors of process adjustment make it difficult for the lens to be in the designed position.

[0003] At present, focusing modules generally adopt thread rotary or manual adjustment. Traditional thread rotary focusing requires one circle of thread to move the lens a certain distance. The lens is adjusted by different pitch values. Different torques are required to adjust different distances of the lens. Continuous rotation is required, which is more time-consuming. In addition, the thread rotary focusing structure is complex and requires the coordination of multiple parts. Manual focusing has large errors during operation and cannot be adjusted more accurately. Manual fixing after focusing is easy to cause errors. Summary of the invention

[0004] The present invention aims to provide a focus-adjustable module for a laser welding process signal detection system and a laser welding system, which adopts a special focus module to adjust the focusing lens to achieve adjustment of the optical path, has a simple structure, is easy to use, and the system is more accurate and stable.

[0005] To this end, the technical solution adopted by the present invention is: a focusable module of a laser welding process signal detection system, comprising a shell, a lens barrel for installing a focusing lens is arranged inside the shell, a focusing code disk for driving the lens barrel to perform axial reciprocating motion is arranged on one side of the shell, a code disk cover for fixing the focusing code disk is arranged on the outside of the focusing code disk, a lens barrel groove which is ring-shaped around the axis of the lens barrel is arranged in the middle of the lens barrel, a boss which slides in the lens barrel groove is arranged on the inner side of the focusing code disk, the boss is eccentrically arranged, the boss is inserted into the lens barrel groove, the focusing code disk is rotated, and the lens barrel is driven to perform axial reciprocating motion through the boss.

[0006] As a preferred embodiment of the above scheme, two hexagon socket head screws are arranged on the left and right sides of the code disc cover plate, and corresponding connecting holes for connecting with the hexagon socket head screws are arranged on the outer shell.

[0007] Further preferably, the code disc cover is provided with a hexagonal screw for fixing the focusing code disc.

[0008] Further preferably, a sealing groove is provided inside the focusing code disc, and a sealing ring is provided inside the sealing groove.

[0009] More preferably, sealing rings are provided at both upper and lower ends of the lens barrel.

[0010] More preferably, damping grease is coated inside the shell.

[0011] Further preferably, arrows are engraved on the outer surface of the focusing code disc by laser, and scale lines are engraved on the code disc cover by laser.

[0012] Further preferably, the outer side end of the focusing code disc is provided with a hexagonal notch for inserting a hexagonal wrench, and the code disc cover plate is correspondingly provided with a through hole.

[0013] At the same time, the present invention also discloses a laser welding system, including a laser welding assembly, a laser welding system adapter block, an adjustable reflector module, and a process signal detection system composed of a laser process monitoring module, an ultraviolet monitoring module and an adjustable focus module. The adjustable focus module adopts the adjustable focus module of the above-mentioned laser welding process signal detection system.

[0014] The beneficial effects of the present invention include: inserting the boss behind the focusing code disk into the lens barrel groove, rotating the focusing code disk to make the boss rotate around the axis of the focusing code disk, thereby driving the lens barrel to make axial reciprocating motion, and then adjusting the position of the focusing lens in the lens barrel, realizing the adjustment of the light path, improving the stability and accuracy of the system, adjusting the focal position of the optical system, and when the signal received by the detector is the maximum, it is the focal position, and the position of the focusing lens is determined at this time; using a special focusing module to adjust the focusing lens, the adjustment of the light path is realized, the structure is simple, and it is easy to use. The system is more accurate and stable, and can better judge whether the welding is qualified or whether there are defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of a laser welding system with a process signal detection system.

[0017] Figure 3 It is a structural diagram of the focusing encoder. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1-3As shown, the focusable module of the laser welding process signal detection system includes a shell 101, a lens barrel 2 for installing a focusing lens is arranged inside the shell 101, a focusing code disk 3 for driving the lens barrel 2 to make axial reciprocating motion is arranged on one side of the shell 101, a code disk cover plate 4 for fixing the focusing code disk 3 is arranged on the outside of the focusing code disk 3, a lens barrel groove 201 is arranged in the middle of the lens barrel 2, a boss 5 sliding in the lens barrel groove 201 is arranged on the inside of the focusing code disk 3, the lens barrel groove 201 is formed into a ring around the axis of the lens barrel 2, the boss 5 is eccentrically arranged, the boss 5 is inserted into the lens barrel groove 201, the focusing code disk 3 is rotated, and the lens barrel 2 is driven to make axial reciprocating motion through the boss 5.

[0020] Two hexagon socket head screws 401 are arranged on the left and right sides of the code disc cover plate 4, and corresponding connecting holes 403 for connecting the hexagon socket head screws 401 are arranged on the housing 101. The two hexagon socket head screws 401 on the code disc cover plate 4 are respectively installed in the corresponding connecting holes 403 to fix the position of the focus code disc 3 to prevent the focus code disc 3 from falling off during the working process, and the code disc cover plate 4 and the focus code disc 3 are clearance-matched, which does not affect the rotation of the focus code disc 3.

[0021] The code disc cover plate 4 is provided with a hexagonal screw 402 for fixing the focus code disc 3. By providing the hexagonal screw 402 on the code disc cover plate 4, when the focus code disc 3 is rotated to the corresponding position, the hexagonal screw 402 is tightened so that its front end is pressed against the focus code disc 3, and the focus code disc 3 is fixed to prevent it from rotating.

[0022] A sealing groove 301 is provided inside the focusing code disc 3, and a sealing ring 6 is provided inside the sealing groove 301. The sealing groove 301 is provided inside the focusing code disc 3, and the sealing ring 6 is provided inside the sealing groove 301 to prevent dust from entering the interior of the housing 101 through the gap of the focusing code disc 3, thereby playing a dustproof role.

[0023] A sealing ring 6 is arranged on the outer periphery of the lens barrel 2. The sealing ring 6 is arranged on the outer periphery of the lens barrel 2 to ensure that dust does not enter the lens barrel 2 when the lens barrel 2 makes axial reciprocating motion, and the focusing lens will not be contaminated.

[0024] Damping grease is coated inside the housing 101. Damping grease is coated inside the housing 101 to ensure stability and accuracy during focus adjustment and displacement.

[0025] The outer surface of the focus code disc 3 is laser engraved with an arrow, and the code disc cover plate 4 is laser engraved with scale lines. By laser engraving arrows and scale lines, the rotation angle and reading during the rotation of the focus code disc 3 are recorded, which makes it more convenient to rotate the focus code disc 3 and can rotate the required angle.

[0026] Insert the boss 5 at the rear of the focusing code disc 3 into the lens barrel groove 201, and rotate the focusing code disc 3 to make the boss 5 rotate around the axis of the focusing code disc 3, thereby driving the lens barrel 2 to make axial reciprocating motion, and then adjust the position of the focusing lens in the lens barrel 2, so as to adjust the light path, improve the stability and accuracy of the system, and adjust the focal position of the optical system. When the signal received by the detector is the maximum, it is the focal position, and the position of the focusing lens is determined at this time.

[0027] like Figure 2 As shown, the laser welding system includes a laser welding component 11, a laser welding system adapter block 10, an adjustable reflector module 9, and a process signal detection system composed of a laser process monitoring module 7, an ultraviolet monitoring module 8 and an adjustable focus module 1. The adjustable focus module 1 adopts the above-mentioned adjustable focus module 1 for the laser welding process signal detection system.

[0028] The laser welding assembly 11 uses a high-energy-density laser beam as a heat source for welding; the laser welding system adapter block 10 is used to connect the adjustable reflector module 9 and the laser welding assembly 11; the adjustable reflector module 9 is used to transmit and reflect the photoelectric signals generated by the workpiece being acted on by the laser during the welding process to the ultraviolet monitoring module 8 and the laser process monitoring module 7 respectively; the adjustable focus module 1 is used for optical focusing; the ultraviolet monitoring module 8 is used to detect the ultraviolet band signals in the transmitted photoelectric signals; the laser process monitoring module 7 is used to detect the visible light band, infrared band and near-infrared band signals in the reflected photoelectric signals.

[0029] During the welding process of the laser welding assembly 11, the light reflected by the laser from the welding workpiece at the working surface is received by the ultraviolet monitoring module 8 and the laser process monitoring module 7 in different bands through the optical components in the laser welding assembly 11 and the reflector in the adjustable reflector module 9. The received photoelectric signals are then processed and calculated by software and algorithms to determine whether the welding is qualified or whether there are defects.

[0030] The adjustable focus module 1 is used to adjust the position of the focusing lens. By using a hexagonal wrench to twist the hexagonal notch 302 at the focusing code disc 3 to make it rotate, the lens barrel 2 is driven to make an axial displacement, thereby adjusting the focal position of the optical system; that is, according to the reversibility of light, the reflected light generated during the welding process is focused on the target surface of the detector in the laser process monitoring module 7 through the set optical system. When the signal received by the detector is the maximum, it is the focal position, and the position of the focusing lens is determined at this time.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. The adjustable focus module of the laser welding process signal detection system is characterized by: The invention comprises a housing (101), wherein a lens barrel (2) for mounting a focusing lens is arranged inside the housing (101), a focus code disc (3) for driving the lens barrel (2) to perform axial reciprocating motion is arranged on one side of the housing (101), a code disc cover plate (4) for fixing the focus code disc (3) is arranged outside the focus code disc (3), a lens barrel groove (201) which is annularly arranged around the axis of the lens barrel (2) is arranged in the middle of the lens barrel (2), a boss (5) which slides in the lens barrel groove (201) is arranged inside the focus code disc (3), the boss (5) is arranged eccentrically, the boss (5) is inserted into the lens barrel groove (201), and the focus code disc (3) is rotated to drive the lens barrel (2) to perform axial reciprocating motion via the boss (5).

2. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: Two hexagon socket head screws (401) are arranged on the left and right sides of the code disc cover plate (4), and corresponding connecting holes (403) for connecting the hexagon socket head screws (401) are arranged on the housing (101).

3. The adjustable focus module of the laser welding process signal detection system according to claim 2, characterized in that: The code disc cover plate (4) is provided with a hexagonal screw (402) for fixing the focus code disc (3).

4. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: A sealing groove (301) is provided inside the focusing code disc (3), and a sealing ring (6) is provided inside the sealing groove (301).

5. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: Sealing rings (6) are provided at both the upper and lower ends of the lens barrel (2).

6. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: The interior of the housing (101) is coated with damping grease.

7. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: Arrows are engraved on the outer surface of the focusing code disc (3) by laser, and scale lines are engraved on the code disc cover plate (4) by laser.

8. The adjustable focus module of the laser welding process signal detection system according to claim 1, characterized in that: The outer end of the focusing code disc (3) is provided with a hexagonal notch (302) for inserting a hexagonal wrench, and a through hole is correspondingly provided on the code disc cover plate (4).

9. A laser welding system, comprising a laser welding assembly (11), a laser welding system adapter block (10), an adjustable reflector module (9), and a process signal detection system composed of a laser process monitoring module (7), an ultraviolet monitoring module (8) and an adjustable focus module (1), characterized in that: The adjustable focus module (1) adopts the adjustable focus module (1) of the laser welding process signal detection system described in any one of claims 1 to 8.

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