Adjustable focusing module for laser processing

Abstract

The invention relates to the technical field of laser processing, and discloses an adjustable focusing module for laser processing, which comprises a base, an air inlet seat arranged above the base and a focal length cylinder arranged above the air inlet seat, the base is provided with a position adjusting concave cavity and a through hole positioned below the position adjusting concave cavity, the position adjusting concave cavity is internally provided with a truncated cone circular ring capable of translating, and the truncated cone circular ring is provided with a through hole positioned below the through hole. A coaxial nozzle is installed at the bottom of the truncated cone ring, and an adjusting assembly used for applying force to the conical face of the truncated cone ring and finely adjusting the positions of the truncated cone ring and the nozzle is arranged on the side face of the base. The truncated cone circular ring and the adjusting assembly are selected to replace a complex fine adjustment structure, part consumables are few, and the manufacturing cost is low; during laser cutting, the position of the nozzle can be finely adjusted only by applying force to the conical surface of the nozzle through the adjusting assembly, it is ensured that the nozzle and a laser beam keep good coaxiality, and therefore the laser cutting quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and in particular to an adjustable focusing module for laser processing. Background Art

[0002] In order to improve the processing quality of laser processing, a nozzle coaxial with the focused laser beam is used during the laser rotary cutting process. The nozzle assists in blowing oxygen or assists in blowing high-pressure argon or nitrogen, compressed air. In this way, the molten material formed during the processing can be easily removed from the formed cutting channel under the action of an airflow with a certain pressure and flow rate, thereby avoiding the molten material from solidifying again to form a recast layer, burrs, etc. The gas pressure is high, the flow rate is high, and the removal effect is better.

[0003] Most of the nozzles currently available on the market are fixed in design and do not have the function of adjusting the position. However, due to the low manufacturing precision of the nozzles, the misalignment between the nozzle and the focused laser beam can only be discovered during the equipment debugging stage. Replacing the nozzle means that it is necessary to re-purchase, which is time-consuming and seriously affects the production debugging and equipment delivery of laser CNC machine tools. Although some nozzles have the function of adjusting the position, their internal structure is extremely complex and expensive, so it is necessary to develop a low-cost, easy-to-adjust adjustable focusing module.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an adjustable focusing module with a sophisticated structure and low cost suitable for laser processing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An adjustable focusing module for laser processing comprises a base, an air inlet seat arranged above the base, and a focal length barrel arranged above the air inlet seat, wherein the base is provided with a position adjustment cavity and a through hole located below the position adjustment cavity, a truncated cone ring which can be translated is provided in the position adjustment cavity, a coaxial nozzle is installed at the bottom of the truncated cone ring, and the nozzle extends downward from the through hole, and an adjustment component for applying force to the conical surface of the truncated cone ring and fine-tuning the position of the truncated cone ring and the nozzle is provided on the side surface of the base; the air inlet seat is a hollow structure and is provided with a coupling cavity, an air inlet channel, and an air outlet connected to the position adjustment cavity, and a focusing lens is provided in the focal length barrel.

[0008] As a further improvement of the above technical solution, the adjustment assembly includes a front cone head screw, a rear cone head screw, a left cone head screw, and a right cone head screw arranged in a circular array on the side of the base, the front cone head screw and the rear cone head screw are coaxially arranged opposite to each other, and the left cone head screw and the right cone head screw are coaxially arranged opposite to each other.

[0009] As a further improvement of the above technical solution, the adjustment assembly includes a rear cone head screw, a front spring ball head plunger, a left cone head screw, and a right spring ball head plunger arranged in a circular array on the side of the base, the front spring ball head plunger and the rear cone head screw are coaxially arranged opposite to each other, and the right spring ball head plunger and the left cone head screw are coaxially arranged opposite to each other.

[0010] As a further improvement of the above technical solution, a lens and a guide ring are horizontally arranged in the coupling cavity of the air inlet seat, the air inlet channel is facing the outer side of the guide ring, and a first guide channel is formed between the guide ring and the inner wall surface of the coupling cavity. The guide ring is coaxial with the lens and is located below the lens, and a second guide channel is formed between the guide ring and the lens. The gas entering from the air inlet channel passes through the first guide channel, the second guide channel, and the inner cavity of the guide ring in sequence and then flows to the outlet.

[0011] As a further improvement of the above technical solution, a sealing ring is provided at the upper edge of the lens.

[0012] As a further improvement of the above technical solution, a connector connected to the air inlet end of the air inlet passage is provided on the side of the air inlet seat.

[0013] As a further improvement of the above technical solution, the nozzle is conical and has an inner conical hole therein.

[0014] As a further improvement of the above technical solution, an extension tube is provided above the focal length tube. Beneficial effects of the present invention: Compared with the prior art, the adjustable focusing module provided by the present invention is specially used for laser rotary cutting, and the truncated cone ring and the adjustment component are cleverly selected to replace the complex fine-tuning structure, with fewer parts and consumables and low manufacturing cost; only the cone surface needs to be exerted by the adjustment component, and part of the force is converted into the thrust of the nozzle fine-tuning translation, so that the position of the nozzle can be finely adjusted to ensure that the nozzle and the laser beam maintain good coaxiality, thereby improving the quality of laser cutting, and the other part of the force is converted into the downward pressure on the truncated cone ring, so that the truncated cone ring is stably pressed against the bottom surface of the adjustment cavity in the working state, and will not slip or vibrate due to airflow, and has high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A stereoscopic diagram of the adjustable focusing module provided by the present invention.

[0016] Figure 2 A cross-sectional view of the adjustable focusing module provided by the present invention.

[0017] Figure 3 This is a schematic diagram to simulate the focusing lens focusing the laser beam passing through the adjustable focusing module. The grid area in the figure is the laser beam.

[0018] Figure 4A schematic diagram of an adjustment component for adjusting the position of a truncated cone ring and a nozzle in one embodiment.

[0019] Explanation of the main component symbols: 1-base, 11-adjusting cavity, 12-through hole, 2-inlet seat, 21-coupling cavity, 22-inlet channel, 23-outlet, 24-guide ring, 25-first guide channel, 26-second guide channel, 31-focal length tube, 32-lens, 33-sealing ring, 4-truncated cone ring, 5-nozzle, 51-inner cone hole, 6-focusing lens, 71-rear cone head screw, 72-front spring ball head plunger, 73-left cone head screw, 74-right spring ball head plunger, 81-joint, 82-extension tube. DETAILED DESCRIPTION

[0020] The present invention provides an adjustable focusing module for laser processing. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0021] See also Figure 1-Figure 3 The present invention provides an adjustable focusing module for laser processing, comprising a base 1, an air inlet seat 2 arranged above the base 1, and a focal length barrel 31 arranged above the air inlet seat 2, wherein the base 1 is provided with a position adjustment cavity 11 and a through hole 12 located below the position adjustment cavity 11, wherein a translatable truncated cone ring 4 is arranged in the position adjustment cavity 11, a coaxial nozzle 5 is installed at the bottom of the truncated cone ring 4, and the nozzle 5 extends downward from the through hole 12, and an adjustment component for applying force to the conical surface of the truncated cone ring 4 and fine-tuning the positions of the truncated cone ring 4 and the nozzle 5 is arranged on the side of the base 1; the air inlet seat 2 is a hollow structure and is provided with a coupling cavity 21, an air inlet channel 22, and an air outlet 23 connected to the position adjustment cavity 11, and a focusing lens 6 is arranged in the focal length barrel 31.

[0022] The adjustable focusing module provided by the present invention can adapt to the use environment of various gases, and enhances the adaptability and flexibility of the equipment. When the equipment finds that the nozzle 5 is not coaxial with the laser beam focused by the focusing lens 6 during the debugging stage, the staff can apply a directional force to the cone surface of the truncated cone ring 4 through the adjustment component on the side of the base 1. After the force is applied, the truncated cone ring 4 can translate in the adjustment cavity 11, driving the nozzle 5 to move until the nozzle 5 and the focused laser beam reach the best coaxial position. When the position of the nozzle 5 is adjusted and locked, the gas enters the coupling cavity 21 through the air inlet channel 22 in the air inlet seat 2, and then flows to the central area of ​​the truncated cone ring 4 through the air outlet 23 connected to the adjustment cavity 11, and finally ejected through the nozzle 5 to assist the laser peeling process, blow the slag generated during the laser peeling process away from the cutting seam, and prevent the formation of a recast layer or burrs.

[0023] Compared with the prior art, the adjustable focusing module provided by the present invention is specially used for laser processing (such as laser rotary cutting), and cleverly selects a truncated cone ring 4 and an adjustment component to replace a complex fine-tuning structure, with fewer parts and consumables and low manufacturing cost. It only needs to apply force to its cone surface through the adjustment component, and part of the force is converted into a thrust for fine-tuning the translation of the nozzle 5, so that the position of the nozzle 5 can be slightly adjusted to ensure that the nozzle 5 maintains good coaxiality with the laser beam, thereby improving the quality of laser cutting, and the other part of the force is converted into a downward pressure on the truncated cone ring 4, so that the truncated cone ring 4 is stably pressed against the bottom surface of the adjustment cavity 11 in the working state, and will not slip or vibrate due to airflow, and has high stability.

[0024] In one embodiment, the adjustment assembly includes a front cone head screw, a rear cone head screw 71, a left cone head screw 73, and a right cone head screw arranged in a circumferential array on the side of the base 1. The front cone head screw is coaxially arranged with the rear cone head screw 71, and the left cone head screw 73 is coaxially arranged with the right cone head screw. Unlike ordinary screws, the tail of the cone head screw is spherical, and a contact point is formed when the spherical tail contacts the conical surface of the truncated cone ring 4. As the adjustment screw rotates, the spherical tail can slide along the conical surface of the truncated cone ring 4 to generate a force, which can be decomposed into a horizontal thrust and a vertical downward force. The thrust realizes the fine adjustment of the position of the truncated cone ring 4 and the nozzle 5, while the downward force ensures the axial position stability of the truncated cone ring 4. The contact point may change, but due to the geometric characteristics of the spherical tail, it can adapt to the curvature change of the cone surface and form a dynamic contact point on the cone surface, thereby providing better contact stability and reliability. When adjusted to a suitable position, the friction between all the cone head screws and the cone surface can prevent the nozzle 5 from rotating in the circumferential direction, thereby ensuring the stability of the nozzle 5 during the processing.

[0025] The front cone screw, the rear cone screw 71, the left cone screw 73, and the right cone screw represent the forces applied to the truncated cone ring 4 in the four directions of front, back, left, and right in the horizontal dimension, so as to achieve the precise adjustment of the position of the nozzle 5, and also have the self-locking property in the axial and circumferential dimensions. That is, the design of the cone screws arranged in the circumferential direction can ensure that the nozzle 5 can be fine-tuned in multiple dimensions to achieve the best coaxiality with the laser beam.

[0026] In actual operation, the front cone head screw, the rear cone head screw 71, the left cone head screw 73, and the right cone head screw can be turned and rotated by a hexagonal wrench. The debugging operation is simple, and the magnitude of the force acting on the truncated cone ring 4 can be accurately controlled, thereby achieving high-precision positioning of the nozzle 5. This precise control is particularly important for application scenarios that require high-precision laser cutting.

[0027] In another embodiment, see Figure 4As shown, the adjustment assembly includes a rear cone head screw 71, a front spring ball head plunger 72, a left cone head screw 73, and a right spring ball head plunger 74 arranged in a circumferential array on the side of the base 1. The front spring ball head plunger 72 is coaxially arranged with the rear cone head screw 71 and used in combination, while the right spring ball head plunger 74 is coaxially arranged with the left cone head screw 73 and used in combination. The procurement cost of the truncated cone ring 4, the rear cone head screw 71, the front spring ball head plunger 72, the left cone head screw 73, and the right spring ball head plunger 74 is very low, which greatly reduces the manufacturing cost of the adjustable focus module.

[0028] It can be understood that the ball head of the front spring ball head plunger 72 always applies an elastic force to the conical surface of the truncated cone ring 4. It is only necessary to rotate the rear cone head screw 71 to overcome the elastic force to fine-tune the position of the truncated cone ring 4 in the Y-axis direction, change the spring compression in the front spring ball head plunger 72, and the front spring ball head plunger 72 adaptively fixes the truncated cone ring 4 in the Y-axis direction, making the operation easier. Similarly, the ball head of the right spring ball head plunger 74 always applies an elastic force to the conical surface of the truncated cone ring 4. It is only necessary to rotate the left cone head screw 73 to overcome the elastic force to fine-tune the position of the truncated cone ring 4 in the X-axis direction, change the spring compression in the right spring ball head plunger 74, and the right spring ball head plunger 74 adaptively fixes the truncated cone ring 4 in the X-axis direction, making the fine-tuning operation easier.

[0029] Similarly, the ball head of the spring ball head plunger and the spherical tail of the cone head screw have the same function and can adapt to the shape of the cone surface and transmit component force through the contact point between the ball head and the cone surface. The force exerted by the spring ball head plunger on the truncated cone ring 4 can be decomposed into horizontal thrust and vertical downward force. The thrust realizes fine adjustment of the position of the truncated cone ring 4 and the nozzle 5, while the downward force ensures the axial position stability of the truncated cone ring 4, so that the applied force can be more evenly transmitted to the truncated cone ring 4, thereby improving the accuracy of the adjustment.

[0030] Preferably, a lens 32 and a guide ring 24 are horizontally arranged in the coupling cavity 21 of the air inlet seat 2, the air inlet channel 22 is facing the outer side of the guide ring 24, a first guide channel 25 is formed between the guide ring 24 and the inner wall of the coupling cavity 21, the guide ring 24 is coaxial with the lens 32 and is located below the lens 32, a second guide channel 26 is formed between the guide ring 24 and the lens 32, and the gas entering from the air inlet channel 22 passes through the first guide channel 25, the second guide channel 26, and the inner cavity of the guide ring 24 in sequence before flowing to the air outlet 23. After entering from the air inlet channel 22, the gas collides with the guide ring 24 and disperses, and before entering the nozzle 5, the gas experiences the dual guiding effect of the first guide channel 25 and the second guide channel 26, which helps to eliminate the turbulence when the gas enters, and reduces the vortex formed when the gas enters the nozzle 5, so that the airflow becomes more stable, which helps to improve the processing quality.

[0031] Preferably, a sealing ring 33 is provided at the upper edge of the lens 32. The sealing ring 33 can effectively prevent external contaminants from entering the coupling cavity 21, protect the lens 32 from contamination, thereby ensuring that the transmission quality of the laser beam is not affected; on the other hand, it can improve the airtightness of the coupling cavity 21 and prevent gas leakage.

[0032] Preferably, a connector 81 connected to the air inlet end of the air inlet channel 22 is provided on the side of the air inlet seat 2. The special connector 81 can ensure a tight connection between the air inlet channel 22 and the external air source, reduce the possibility of gas leakage, and improve the air tightness of the system.

[0033] Specifically, the nozzle 5 is conical and has an inner conical hole 51 therein. The angle of the inner conical hole 51 is 13°. The design of the inner conical hole 51 enables the gas to gradually concentrate at the outlet of the nozzle 5 when passing through the nozzle 5, forming a concentrated high-speed airflow, which helps to improve the gas injection efficiency, helps to quickly blow away the slag generated during the cutting process, avoids the formation of a recast layer or burrs, and thus improves the smoothness of the cut surface and the cutting quality.

[0034] Preferably, an extension tube 82 is provided above the focal tube 31. The use of the extension tube 82 allows the focal tube 31 to adapt to workbenches or workpiece brackets of different heights, ensuring that the laser beam can always be accurately focused on the workpiece surface.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations 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 device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] 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, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An adjustable focusing module for laser processing, characterized in that: It includes a base, an air inlet seat arranged above the base, and a focal length tube arranged above the air inlet seat, the base is provided with a position adjustment cavity and a through hole located below the position adjustment cavity, a translatable truncated cone ring is provided in the position adjustment cavity, a coaxial nozzle is installed at the bottom of the truncated cone ring, and the nozzle extends downward from the through hole, and an adjustment component for applying force to the conical surface of the truncated cone ring and fine-tuning the position of the truncated cone ring and the nozzle is provided on the side of the base; the air inlet seat is a hollow structure and is provided with a coupling cavity, an air inlet channel, and an air outlet connected to the position adjustment cavity, and a focusing lens is provided in the focal length tube.

2. The adjustable focusing module for laser processing according to claim 1, characterized in that: The adjustment assembly includes a front cone head screw, a rear cone head screw, a left cone head screw, and a right cone head screw arranged in a circumferential array on the side of the base. The front cone head screw and the rear cone head screw are coaxially arranged opposite to each other, and the left cone head screw and the right cone head screw are coaxially arranged opposite to each other.

3. The adjustable focusing module for laser processing according to claim 1, characterized in that: The adjustment assembly includes a rear cone head screw, a front spring ball head plunger, a left cone head screw, and a right spring ball head plunger arranged in a circular array on the side of the base. The front spring ball head plunger is coaxially arranged with the rear cone head screw, and the right spring ball head plunger is coaxially arranged with the left cone head screw.

4. The adjustable focusing module for laser processing according to claim 1, characterized in that: A lens and a guide ring are horizontally arranged in the coupling cavity of the air inlet seat, the air inlet channel is facing the outer side of the guide ring, a first guide channel is formed between the guide ring and the inner wall of the coupling cavity, the guide ring is coaxial with the lens and is located below the lens, a second guide channel is formed between the guide ring and the lens, and the gas entering from the air inlet channel passes through the first guide channel, the second guide channel, and the inner cavity of the guide ring in sequence and then flows to the air outlet.

5. The adjustable focusing module for laser processing according to claim 4, characterized in that: A sealing ring is arranged on the upper edge of the lens.

6. The adjustable focusing module for laser processing according to claim 1, characterized in that: A joint connected to the air inlet end of the air inlet channel is provided on the side of the air inlet seat.

7. The adjustable focusing module for laser processing according to claim 1, characterized in that: The nozzle is conical and has an inner conical hole therein.

8. The adjustable focusing module for laser processing according to claim 1, characterized in that: An extension tube is arranged above the focal length tube.

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