Air blowing device for laser cutting head

Abstract

The utility model relates to a kind of gas path blowing device of laser cutting head, including auxiliary gas connector and gas path channel, the auxiliary gas connector be arranged in the upper end of the gas path channel, the gas path channel be arranged in the inside of the side wall of laser cutting head, the gas path channel extends from top to bottom, the lower end of the gas path channel as gas outlet and located the below of the focusing lens of the laser cutting head, the auxiliary gas connector is located the above of the focusing lens of the laser cutting head.The utility model's gas path blowing device of laser cutting head, gas path channel is set up in cutting head side wall, auxiliary gas connector is located focusing lens upside, gas outlet is located focusing lens downside, on the one hand, it can provide auxiliary gas, protect the focusing lens in cutting nozzle, prevent dust from entering to reduce;On the other hand, it can reduce the volume of cutting head front section, so that cutting head can use more complex parts processing.

Description

Technical Field

[0001] This utility model belongs to the field of CO2 laser cutting technology, specifically relating to a gas path blowing 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 robots with internal optical guide arms, different assist gases are required for cutting different materials. The pressure and required flow rate of the assist gas vary depending on the material and thickness being cut. Common assist gases include air, oxygen, and nitrogen, generally requiring a pressure of 0.3-0.8 MPa. When not cutting parts, the assist gas is continuously output at a low flow rate and pressure to protect the lens inside the cutting nozzle and prevent dust from entering; this is typically at a pressure of 0.05 MPa and a flow rate of 5 L / min.

[0010] Currently, the auxiliary gas connector of the cutting head is located on the lower side of the focusing lens, and the auxiliary gas is blown out from the outer surface of the focusing lens. This design results in a larger cutting head, making it difficult to adapt to the processing of more complex parts. Utility Model Content

[0011] To address the aforementioned problems in the prior art, this utility model provides an air path blowing device for a laser cutting head.

[0012] To achieve the above objectives, the gas blowing device for the laser cutting head of this utility model is characterized by comprising an auxiliary gas connector and a gas path channel. The auxiliary gas connector is disposed at the upper end of the gas path channel, and the gas path channel is disposed inside the side wall of the laser cutting head. The gas path channel extends from top to bottom, and the lower end of the gas path channel serves as a gas outlet and is located below the focusing lens of the laser cutting head. The auxiliary gas connector is located above the focusing lens of the laser cutting head.

[0013] Preferably, the gas passage includes a vertical passage and a horizontal passage, the auxiliary gas connector is connected to the upper end of the vertical passage, the lower end of the vertical passage is connected to one end of the horizontal passage, and the other end of the horizontal passage is the gas outlet.

[0014] Preferably, the end of the transverse passage extends to the outside of the laser cutting head for mounting a sensor.

[0015] Preferably, a sealing ring is provided at the joint position in the gas passage.

[0016] Preferably, the inner diameter of the air passage is 3.5 mm.

[0017] Preferably, a backup gas path is included, which is configured relative to the gas path channel.

[0018] The present invention relates to a gas delivery device for a laser cutting head. A gas channel is opened in the side wall of the cutting head, the auxiliary gas connector is located on the upper side of the focusing lens, and the gas outlet is located on the lower side of the focusing lens. On the one hand, it can provide auxiliary gas to protect the focusing lens inside the cutting nozzle and prevent dust from entering and reducing its size; on the other hand, it can reduce the volume of the front section of the cutting head, so that the cutting head can be used to process more complex parts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the laser cutting head of this utility model.

[0020] Figure 2 This is a cross-sectional view of the laser cutting head of this utility model.

[0021] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0022] Figure 4 This is a schematic diagram of the air blowing device for the laser cutting head of this utility model. Detailed Implementation

[0023] 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.

[0024] like Figures 1 to 4 The image shows an embodiment of the gas delivery device for the laser cutting head 3 of this invention, used to provide auxiliary gas to the laser cutting head. The gas delivery device includes an auxiliary gas connector 1 and a gas passage 2. The auxiliary gas connector 1 is located at the upper end of the gas passage 2 and is used to connect to a gas source. The gas passage 2 is located inside the side wall of the laser cutting head 3, which has a hollow cavity, and the gas passage 2 of this invention is located inside its side wall.

[0025] like Figure 3 As shown, the gas passage 2 extends from top to bottom, the lower end of the gas passage 2 serves as the gas outlet 4 and is located below the focusing lens 5 of the laser cutting head, and the auxiliary gas connector 1 is located above the focusing lens 5 of the laser cutting head.

[0026] like Figure 3 As shown, the gas passage 2 includes a vertical passage 7 and a horizontal passage 8. The auxiliary gas connector 1 is connected to the upper end of the vertical passage 7, and the lower end of the vertical passage 7 is connected to one end of the horizontal passage 8. The other end of the horizontal passage 8 is the gas outlet 4. The inner diameter of the gas passage is 3.5 mm.

[0027] like Figure 3 As shown, the end of the transverse passage 8 leads to the outside of the laser cutting head and is used to install a sensor 9 for detecting air pressure and / or flow rate.

[0028] like Figure 1 As shown, a sealing ring 6 is provided at the joint position in the air passage 2 to achieve an airtight seal.

[0029] like Figure 3 As shown, it may also include a backup gas path 10, which is disposed inside the side wall of the laser cutting head 3 relative to the gas path channel, and can be used for airtightness or cooling functions.

[0030] The present invention relates to a gas delivery device for a laser cutting head. A gas channel is opened in the side wall of the cutting head, the auxiliary gas connector is located on the upper side of the focusing lens, and the gas outlet is located on the lower side of the focusing lens. On the one hand, it can provide auxiliary gas to protect the focusing lens inside the cutting nozzle and prevent dust from entering and reducing its size; on the other hand, it can reduce the volume of the front section of the cutting head, so that the cutting head can be used to process more complex parts.

[0031] 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 pneumatic blowing device for a laser cutting head, characterized in that, It includes an auxiliary gas connector and a gas path channel. The auxiliary gas connector is located at the upper end of the gas path channel, and the gas path channel is located inside the side wall of the laser cutting head. The gas path channel extends from top to bottom, and the lower end of the gas path channel serves as a gas outlet and is located below the focusing lens of the laser cutting head. The auxiliary gas connector is located above the focusing lens of the laser cutting head.

2. The air blowing device for the laser cutting head according to claim 1, characterized in that, The gas passage includes a vertical passage and a horizontal passage. The auxiliary gas connector is connected to the upper end of the vertical passage, the lower end of the vertical passage is connected to one end of the horizontal passage, and the other end of the horizontal passage is the gas outlet.

3. The air blowing device for the laser cutting head according to claim 2, characterized in that, The end of the lateral passage leads to the outside of the laser cutting head and is used to mount a sensor.

4. The air blowing device for the laser cutting head according to claim 1, characterized in that, A sealing ring is installed at the joint position in the gas passage.

5. The air blowing device for the laser cutting head according to claim 1, characterized in that, The inner diameter of the air passage is 3.5 mm.

6. The air blowing device for the laser cutting head according to claim 1, characterized in that, It includes a backup gas path, which is configured relative to the gas path channel.

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