Focusing lens mounting device for laser cutting head

Abstract

The utility model relates to a kind of focusing lens mounting device of laser cutting head, including first circular ring and second circular ring, the outer surface of the first circular ring has the fastening structure matched with the inner wall of the laser cutting head, by the cooperation between the fastening structure of the first circular ring and the inner wall of the laser cutting head, the second circular ring is pressed in the focusing lens described on.The focusing lens mounting device of laser cutting head of the utility model is firm and reliable, without loosening, avoids the deviation of light path, avoids abrasion;Still can be through adjustable pressure force, prevent the lens from being crushed.

Description

Technical Field

[0001] This utility model belongs to the field of CO2 laser cutting technology, specifically relating to a focusing lens mounting device for a laser cutting head. Background Technology

[0002] CO2 laser cutting technology is mainly used for processing non-metallic materials. Unlike fiber lasers, CO2 lasers can only use mirror reflection or refraction as the transmission method for optical path transmission.

[0003] The main reason CO2 lasers cannot be transmitted through optical fibers is their relatively long wavelength (10.6 micrometers), which falls into the infrared band, while optical fiber transmission has strict wavelength limitations. The transmission characteristics of optical fibers dictate that they are only suitable for short-wavelength lasers (such as visible or ultraviolet light), while the wavelength of CO2 lasers exceeds the transmission range of optical fibers. The long wavelength of CO2 lasers produces significant dispersion effects in optical fibers, leading to decreased beam quality, signal distortion, and the inability to achieve stable transmission. Therefore, transmitting CO2 lasers during motion is particularly difficult.

[0004] Currently, there are four main types of mature CO2 laser processing equipment on the market: three-axis machine tool laser cutting equipment, five-axis machine tool laser cutting equipment, externally guided light arm robotic laser cutting equipment, and internally guided light arm robotic laser cutting equipment. All of these solutions use mirror reflection for light path transmission and employ a cutting head as the final beam shaping mechanism at the actuator end, but their forms differ significantly.

[0005] In three-axis laser cutting equipment, the cutting head is mounted at the end of the Z-axis. This type of equipment can only process flat parts. The cutting head does not need to consider size and interference issues. The cutting head is fixedly installed and does not require a collision detection device. The structure is simple, similar to a CNC machine tool, and the processing accuracy is high. However, the equipment occupies a large area and can only process flat products, and cannot achieve three-dimensional cutting.

[0006] In five-axis laser cutting equipment, the cutting head is mounted at the end of the Z-axis, and two additional rotary axes, RZ and RX, are added. This allows the cutting head to rotate at small angles. However, due to the addition of two axes, the cutting head is larger in size. It can process parts with bevels, but can only cut from the front to the back. A few high-end machines have anti-collision devices, have a simple structure, are similar to CNC machine tools, and have high processing accuracy, enabling simple three-dimensional cutting. However, the equipment occupies a large area, can only perform simple three-dimensional cutting, and cannot perform complex three-dimensional cutting. The large size of the cutting head also prevents the processing of irregularly shaped small parts.

[0007] In external optical guide arm type robotic laser cutting equipment, the optical guide arm is mounted on the robot arm. The robot drives the optical guide arm to move and achieve cutting. The cutting head is the end of the external optical guide arm and is mounted at the robot's six-axis flange. An external optical guide device is still required at the robot's 4th, 5th, and 6th axis connection points. Due to the limitations of the robot's structure, high-power lasers cannot be used. Its advantage is that it superimposes the laser and the robot to achieve a wider range and more complex trajectories. Its disadvantages are that only special robot models can achieve this, a balancing crane is needed to ensure the optical guide arm is supported, the robot's range of motion is limited by the optical guide arm, it can only perform simple three-dimensional part processing, the laser head lacks anti-collision functionality, the laser power is relatively low, and the accuracy is low (limited by the robot's accuracy).

[0008] This internally guided laser arm robotic laser cutting equipment integrates the laser guide arm within the robot arm. The robot employs a hollow structure, with all motors and reducers offset. The laser transmission lens moves along the robot's axis. The robot's six-axis has been removed, and the five-axis has been redesigned, integrating the lens and water-cooling system. An anti-collision device, an independent and removable mechanism, is added between the five-axis and the cutting head. The cutting head integrates focusing, protective gas, and a replaceable cutting nozzle. Its advantages include a highly compact size, not encroaching on any external robot space, making it suitable for integration into other equipment; unrestricted robot movement range, with the laser beam reaching all within the robot's reach; and motion accuracy of ±0.01mm, suitable for complex 3D cutting. The cutting head is perfectly integrated with the robot, essentially functioning as the robot's sixth axis. The disadvantage is that currently, very few robots are suitable for this design.

[0009] For laser cutting equipment with an internal optical guide arm, the focusing lens is installed inside the cutting head and is a key component of laser cutting. The lens material is generally zinc selenide with a special coating on the surface. The focusing lens is easily scratched during installation and is prone to loosening, which can cause the optical path to deviate. Utility Model Content

[0010] To address the aforementioned problems in the prior art, this utility model provides a focusing lens mounting device for a laser cutting head.

[0011] To achieve the above objectives, the focusing lens mounting device for the laser cutting head of this utility model is characterized by comprising a first ring and a second ring. The outer surface of the first ring has a fastening structure that matches the inner wall of the laser cutting head. Through the cooperation between the fastening structure of the first ring and the inner wall of the laser cutting head, the second ring is pressed onto the focusing lens.

[0012] Preferably, the fastening structure is an external thread.

[0013] Preferably, a sealing ring is provided between the bottom of the second ring and the upper surface of the focusing lens.

[0014] Preferably, the inner wall of the laser cutting head is provided with a support boss for supporting the focusing lens, and a lower sealing ring is provided between the lower surface of the focusing lens and the support boss.

[0015] Preferably, the second ring is a smooth ring.

[0016] Preferably, the first ring is provided with several tool slots.

[0017] Preferably, the tool slot has an upper opening.

[0018] Preferably, the second ring is provided with several tool holes.

[0019] The focusing lens mounting device of this invention for the laser cutting head is firm and reliable, without loosening, preventing optical path deviation and scratches; it can also prevent the lens from being crushed by adjusting the clamping force. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the laser cutting head of this utility model.

[0021] Figure 2 This is a cross-sectional view of the laser cutting head of this utility model.

[0022] Figure 3 This is a partial exploded view of the laser cutting head of this utility model.

[0023] Figure 4 for Figure 2 A magnified view of a portion of the image. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figures 1 to 4 The image shows an embodiment of the focusing lens mounting device for the laser cutting head 8 of this utility model. The focusing lens mounting device includes a first ring 1 and a second ring 2. The outer surface of the first ring 1 has a fastening structure 3 that matches the inner wall of the laser cutting head 8. Through the cooperation between the fastening structure 3 of the first ring 1 and the inner wall of the laser cutting head, the second ring 2 is pressed onto the focusing lens 4.

[0026] Specifically, the fastening structure 3 can be an external thread. The inner wall of the laser cutting head has a matching internal thread. Through the cooperation of the external and internal threads, the second ring can be firmly and reliably pressed onto the focusing lens 4, preventing the focusing lens from loosening. Adjustable clamping force can also be provided by screwing on the first ring 1 to prevent the lens from being crushed. The second ring 2 can be a smooth ring.

[0027] like Figure 3 and Figure 4 As shown, a sealing ring 5 is provided between the bottom of the second ring 2 and the upper surface of the focusing lens 4.

[0028] like Figure 3 and Figure 4 As shown, the inner wall of the laser cutting head is provided with a support boss 7 to support the focusing lens 4, and a lower sealing ring 6 is provided between the lower surface of the focusing lens 4 and the support boss 7. The upper sealing ring 5 and the lower sealing ring 6 can prevent foreign objects from entering the focusing lens 4.

[0029] like Figure 3 and Figure 4 As shown, the first ring 1 has two symmetrically distributed tool slots 9. Each tool slot 9 has an upper opening. These tool slots facilitate the engagement of a ring wrench, making it easy to tighten the first ring.

[0030] like Figure 3 and Figure 4 As shown, the second ring 2 is provided with four symmetrically distributed tool holes 10 to facilitate the removal of the second ring. After the first ring is removed, the second ring may be tightly bound to the inner wall of the outer shell due to pressure or tension, and cannot be removed by gravity alone. The tool holes can be used to pull the ring outward with a needle-type tool.

[0031] The focusing lens mounting device of this invention for the laser cutting head is firm and reliable, without loosening, preventing optical path deviation and scratches; it can also prevent the lens from being crushed by adjusting the clamping force.

[0032] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A focusing lens mounting device for a laser cutting head, characterized in that, It includes a first ring and a second ring. The outer surface of the first ring has a fastening structure that matches the inner wall of the laser cutting head. Through the cooperation between the fastening structure of the first ring and the inner wall of the laser cutting head, the second ring is pressed onto the focusing lens.

2. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, The fastening structure is an external thread.

3. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, A sealing ring is provided between the bottom of the second ring and the upper surface of the focusing lens.

4. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, The inner wall of the laser cutting head is provided with a support boss for supporting the focusing lens, and a lower sealing ring is provided between the lower surface of the focusing lens and the support boss.

5. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, The second ring is a smooth ring.

6. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, The first ring is provided with several tool slots.

7. The focusing lens mounting device for a laser cutting head according to claim 6, characterized in that, The tool slot has an upper opening.

8. The focusing lens mounting device for the laser cutting head according to claim 1, characterized in that, The second ring is provided with several tool holes.

Images