Laser welding head for inner wall circumferential weld

Abstract

The utility model relates to a laser welding technology, in particular to a laser welding head for an inner wall circumferential weld, which comprises a support plate, a hollow rotating shaft, a laser light source and a light channel assembly, the laser light source is fixed on the upper portion of the support plate through a shell 4, and a collimating mirror is arranged in the shell; a motor and a speed reducing mechanism are further arranged on the upper portion of the supporting plate, a vertical through hole is formed in the middle of the supporting plate, the hollow rotating shaft penetrates through the vertical through hole in the middle of the supporting plate and is rotationally connected with the supporting plate, and the upper end of the hollow rotating shaft is connected with the motor sequentially through a transmission mechanism and the speed reducing mechanism. The optical channel assembly comprises a first vertical arm, a transverse arm, a second vertical arm and a focusing arm, a focusing module is arranged in the focusing arm, and the optical axis of the focusing module inclines downwards and intersects with the rotation axis of the hollow rotating shaft. The automatic laser welding device can be installed on a large mechanical arm or a support, and high-precision automatic laser welding of circumferential welds on the inner wall of a small-diameter annular workpiece on a large component is achieved.

Description

Technical Field

[0001] This utility model relates to laser welding technology, specifically a laser welding head for inner wall circumferential welds. Background Technology

[0002] In the confined spaces of certain engineering components, it is sometimes necessary to weld some small-diameter annular workpieces (such as annular mounting bases, annular flanges, etc.). To ensure welding quality, these small-diameter annular workpieces usually require the application of outer and inner wall ring welds.

[0003] Laser welding offers excellent welding quality and efficiency. Existing laser welding equipment is largely digitally controlled, employing dual-axis linkage to weld planar circular welds. However, when laser welding the inner circumferential weld seams of small-diameter annular workpieces, if the workpiece is attached to a large component that cannot rotate, and further constrained by the narrow space at the welding location, the operating status of the CNC laser welding equipment (such as welding arm posture, angle, and stroke) cannot meet the welding requirements due to the structural influence of the component's welding area. Therefore, existing CNC laser welding equipment struggles to achieve planar circular weld seams. Manual welding, on the other hand, suffers from low efficiency and inconsistent weld quality. Utility Model Content

[0004] To address the problems raised in the background technology, the purpose of this utility model is to propose a laser welding head for inner wall circumferential welds. It adopts a combination of hollow rotation, reflector, and focusing lens after laser collimation to focus the laser onto the narrow inner wall circumferential weld. At the same time, the rotation is controlled by a deceleration mechanism to achieve laser welding of the inner wall circumferential weld. This utility model can replace existing CNC welding equipment when welding small-diameter circular workpieces, realizing high-precision automated laser welding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A laser welding head for inner wall circumferential welds includes a support plate, a hollow rotating shaft, a laser source, and an optical channel assembly. The laser source is fixed to the upper part of the support plate via a housing 4, and a collimating lens is disposed inside the housing. The upper part of the support plate also includes a motor and a reduction mechanism. A vertical through hole is provided in the middle of the support plate, and the hollow rotating shaft passes through the vertical through hole in the middle of the support plate and is rotatably connected to the support plate. The upper end of the hollow rotating shaft is connected to the motor sequentially via a transmission mechanism and a reduction mechanism. The optical channel assembly includes a first vertical arm, a horizontal arm, a second vertical arm, and a focusing arm, all of which are hollow. The structure is a square tube. The first vertical arm is connected to the lower end of the hollow rotating shaft. One end of the horizontal arm is connected to one side of the lower part of the first vertical arm. The second vertical arm is connected to the other end of the horizontal arm. The focusing arm is connected to the lower end of the second vertical arm. The lower end of the first vertical arm is equipped with a first reflector. The upper end of the second vertical arm is equipped with a second reflector. A third reflector is equipped at the connection between the second vertical arm and the focusing arm. The focusing arm is equipped with a focusing module. The optical axis of the focusing module is tilted downward and intersects the rotation axis of the hollow rotating shaft. The laser emitted by the laser source passes downward through the collimating lens, then through the hollow rotating shaft, and then sequentially through the first reflector, the second reflector, the third reflector, and the focusing module before being output.

[0007] Both the first and second reflecting mirrors are 45-degree reflecting mirrors.

[0008] The transmission mechanism includes a driving wheel and a driven wheel. The driven wheel is fixedly sleeved on the upper end of the hollow rotating shaft. The driving wheel is connected to the motor main shaft through a reduction mechanism. The driving gear and the driven gear are connected by a transmission belt.

[0009] The hollow rotating shaft is fitted with a first bearing on its upper part and a second bearing on its lower part. Both the first and second bearings are installed in the vertical through hole in the middle of the support plate. The hollow rotating shaft is connected to the vertical through hole of the support plate through the first and second bearings.

[0010] The collimating lens is a transmission collimating lens.

[0011] The focusing module includes a convex lens.

[0012] The first vertical arm is provided with a detachable first sealing plate at its lower part, the second vertical arm is provided with a second sealing plate at its upper part, and a third sealing plate at its lower part.

[0013] This invention has the following advantages: The hollow shaft is driven to rotate by the upper motor, and the hollow shaft drives the optical channel assembly to introduce the laser focus point into the narrow inner wall circumferential weld. During welding, there is no need for dual-axis linkage. Only by rotating the hollow shaft can high-precision automated laser welding of the inner wall circumferential weld of the circular workpiece be realized. This invention can be installed on a large robotic arm or bracket to realize the automation of welding small-diameter circular workpieces on large components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is the front view of the present invention.

[0016] Figure 3 This is a schematic diagram of the optical path of this utility model.

[0017] In the figure, 1-support plate, 2-hollow rotating shaft, 3-laser light source, 4-outer shell, 5-collimating lens, 6-motor, 7-reduction mechanism; 11-first vertical arm, 12-horizontal arm, 13-second vertical arm, 14-focusing arm, 15-first reflector, 16-second reflector, 17-third reflector, 18-focusing module, 19-drive wheel, 20-driven wheel. Detailed Implementation

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1-3 As shown, this utility model provides a laser welding head for inner wall circumferential welds, including a support plate 1, a hollow rotating shaft 2, a laser source 3, and an optical channel assembly. The laser source 3 is fixed to the upper part of the support plate 1 through a housing 4, and a collimating lens 5 is provided inside the housing 4. The upper part of the support plate 1 is also provided with a motor 6 and a reduction mechanism 7. The support plate 1 has a vertical through hole in the middle. The hollow rotating shaft 2 passes through the vertical through hole in the middle of the support plate 1 and is rotatably connected to the support plate 1. The upper end of the hollow rotating shaft 2 is connected to the motor 6 in sequence through a transmission mechanism and a reduction mechanism 7. The optical channel assembly includes a first vertical arm 11, a horizontal arm 12, a second vertical arm 13, and a focusing arm 14. The first vertical arm 11, the horizontal arm 12, the second vertical arm 13, and the focusing arm 14 are all hollow square tubes. The structure consists of a first vertical arm 11 connected to the lower end of the hollow rotating shaft 2, a horizontal arm 12 connected to one side of the lower part of the first vertical arm 11, a second vertical arm 13 connected to the other end of the horizontal arm 12, and a focusing arm 14 connected to the lower end of the second vertical arm 13. A first reflector 15 is provided at the lower end of the first vertical arm 11, a second reflector 16 is provided at the upper end of the second vertical arm 13, and a third reflector 17 is provided at the connection between the second vertical arm 13 and the focusing arm 14. A focusing module 18 is provided in the focusing arm 14. The optical axis of the focusing module 18 is inclined downward and intersects the rotation axis of the hollow rotating shaft 2. The laser emitted by the laser source 3 passes downward through the collimating lens 5, then through the hollow rotating shaft 2, and then sequentially through the first reflector 15, the second reflector 16, the third reflector 17, and the focusing module 18 before being output.

[0020] In one embodiment of this utility model, the laser source 3 in the above structure is fixedly installed on the upper end of the housing 5. The housing 5 can be connected to the motor housing or directly connected to the support plate 1. The housing 5 also covers the transmission mechanism inside, thus obtaining a safe and aesthetically pleasing external structure.

[0021] In use, the support plate 1 serves as a connector to an external robotic arm or bracket, enabling the welding of partial inner wall circumferential welds on large components that cannot be placed on a welding workbench. The laser source 1 utilizes a fiber laser connector to introduce the light source. The motor is also a servo motor, achieving digital control.

[0022] In this utility model, the mounting structures of the collimating mirror 5, the first reflecting mirror 15, the second reflecting mirror 16, the third reflecting mirror 17, and the focusing module 18 are all existing technologies. Among them, the third reflecting mirror 17 and the focusing module 18 both adopt an adjustable deflection angle mounting structure, which will not be described in detail here.

[0023] Both the first reflector 15 and the second reflector 16 are 45-degree reflectors.

[0024] The transmission mechanism includes a driving wheel 19 and a driven wheel 20. The driven wheel 20 is fixedly sleeved on the upper end of the hollow rotating shaft 2. The driving wheel 19 is connected to the main shaft of the motor 6 through a reduction mechanism 7. The driving wheel 19 and the driven wheel 20 are connected by a transmission belt.

[0025] The hollow rotating shaft 2 is fitted with a first bearing on its upper part and a second bearing on its lower part. Both the first and second bearings are installed in the vertical through hole in the middle of the support plate 1. The hollow rotating shaft 2 is connected to the vertical through hole of the support plate 1 through the first and second bearings.

[0026] The collimating lens 5 is a transmission collimating lens. The focusing module 18 includes a convex lens.

[0027] The first vertical arm 11 has a detachable first sealing plate at its lower part, the second vertical arm 13 has a second sealing plate at its upper part and a third sealing plate at its lower part. All of these sealing plates are detachable, which facilitates the installation and adjustment of the lens.

[0028] The parts of this utility model not described in detail are existing technologies.

Claims

1. A laser welding head for inner wall circumferential welds, comprising a support plate (1), a hollow rotating shaft (2), a laser source (3), and an optical channel assembly, characterized in that: The laser light source (3) is fixed to the upper part of the support plate (1) through the outer shell (4), and the collimating lens (5) is provided inside the outer shell (4); the upper part of the support plate (1) is also provided with a motor (6) and a reduction mechanism (7), and the middle part of the support plate (1) is provided with a vertical through hole. The hollow rotating shaft (2) passes through the vertical through hole in the middle part of the support plate (1) and is rotatably connected to the support plate (1). The upper end of the hollow rotating shaft (2) is connected to the motor (6) in sequence through the transmission mechanism and the reduction mechanism (7); the optical channel assembly includes a first vertical arm (11), a horizontal arm (12), a second vertical arm (13) and a focusing arm (14). The first vertical arm (11), the horizontal arm (12), the second vertical arm (13) and the focusing arm (14) are all hollow square tube structures. The first vertical arm (11) is connected to the lower end of the hollow rotating shaft (2), and the horizontal arm (13) is connected to the lower end of the hollow rotating shaft (2). 2) One end is connected to the lower side of the first vertical arm (11), the second vertical arm (13) is connected to the other end of the horizontal arm (12), the focusing arm (14) is connected to the lower end of the second vertical arm (13), the lower end of the first vertical arm (11) is provided with a first reflector (15), the upper end of the second vertical arm (13) is provided with a second reflector (16), the connection between the second vertical arm (13) and the focusing arm (14) is provided with a third reflector (17), the focusing arm (14) is provided with a focusing module (18), the optical axis of the focusing module (18) is tilted downward and intersects with the rotation axis of the hollow rotating shaft (2); the laser emitted by the laser source (3) passes downward through the collimating lens (5) and then through the hollow rotating shaft (2), and then outputs through the first reflector (15), the second reflector (16), the third reflector (17) and the focusing module (18) in sequence.

2. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The first reflector (15) and the second reflector (16) are both 45-degree reflectors.

3. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The transmission mechanism includes a drive wheel (19) and a driven wheel (20). The driven wheel (20) is fixedly sleeved on the upper end of the hollow rotating shaft (2). The drive wheel (19) is connected to the main shaft of the motor (6) through a reduction mechanism (7). The drive wheel (19) and the driven wheel (20) are connected by a transmission belt.

4. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The hollow rotating shaft (2) is fitted with a first bearing on the upper part and a second bearing on the lower part. Both the first and second bearings are installed in the vertical through hole in the middle of the support plate (1). The hollow rotating shaft (2) is connected to the vertical through hole of the support plate (1) through the first and second bearings.

5. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The collimating lens (5) is a transmission collimating lens.

6. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The focusing module (18) includes a convex lens.

7. A laser welded joint for internal wall girth welds according to claim 1, characterized in that: The first vertical arm (11) is provided with a detachable first sealing plate at the lower part, the second vertical arm (13) is provided with a second sealing plate at the upper part and a third sealing plate at the lower part.

Images