Focusing device of laser cutting head and laser cutter

By designing the focus assembly in the laser cutting head and automatically adjusting the laser focal length using the transmission wheel and transmission rod, the problem that the focus in existing laser cutting machines is difficult to adapt to different materials and thicknesses, and more efficient laser cutting is achieved.

CN222569571UActive Publication Date: 2025-03-07WUHAN CHUTIAN IND LASER EQUIP
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Patent Information

Application Number
CN202421316620.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-11
Publication Date
2025-03-07
Estimated Expiration
2034-06-11

AI Technical Summary

Technical Problem

In existing laser cutting machines, the focus of the cutting head is difficult to adapt to different materials and thicknesses, which leads to manual adjustment by operators, making it difficult to accurately position, affecting work efficiency.

Method used

A focusing device for a laser cutting head is designed, including a focus base, a lens barrel and a focus assembly. The focus adjustment assembly uses the first driving unit and the second driving unit to drive the lens barrel to move in the vertical direction and automatically adjust the focal length of the laser.

Benefits of technology

It achieves better concentration of laser energy, improves cutting efficiency, reduces the need for manual adjustment, and improves the accuracy and efficiency of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a focusing device of a laser cutting head and a laser cutter, and belongs to the technical field of laser cutting. The focusing device comprises a focusing seat, a lens cone and a focusing assembly, the focusing seat is arranged on a laser head, and an adjusting cavity vertically penetrating through the focusing seat is formed in the focusing seat; the lens cone is movably inserted into the adjusting cavity, and the lens cone is in clearance fit connection with the inner wall of the adjusting cavity; the focusing assembly comprises a first driving unit, the first driving unit comprises a rotatable transmission wheel and a transmission rod, the lens barrel is provided with a horizontally arranged driving groove, the transmission rod is eccentrically arranged relative to the transmission wheel, one end of the transmission rod is fixedly connected with the transmission wheel, and the other end of the transmission rod is inserted into the driving groove; the rotating transmission wheel can drive the lens barrel to move in the vertical direction of the adjusting cavity through the transmission rod. The distance between the lens and the part to be cut can be roughly and accurately adjusted, so that the focal length of laser is automatically adjusted, the energy of the laser is more concentrated, and the cutting efficiency is higher.
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Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting, in particular to a focusing device of a laser cutting head and a laser cutter. Background Art

[0002] Laser processing technology is a new cutting technology that uses the interaction between laser beams and materials to perform cutting, drilling, and micro-machining. Laser processing technology is increasingly used due to its fast speed, zero extrusion, and minimal burrs.

[0003] However, existing laser cutting machines still have the following problems: for example, the focus of the cutting head cannot adapt to different materials and thicknesses. Therefore, when cutting plates of different materials and thicknesses, the operator needs to manually adjust the laser cutting focus to meet the cutting requirements. Manual adjustment is difficult to accurately position, and repeated adjustments are required to determine the laser cutting focus, which seriously affects the working efficiency of the laser cutting machine. Utility Model Content

[0004] In view of this, it is necessary to provide a focusing device for a laser cutting head and a laser cutter to solve the problem that the existing laser cutting head is difficult to automatically focus.

[0005] On the one hand, the utility model provides a focusing device for a laser cutting head, comprising:

[0006] A focusing seat is provided on the laser head, wherein the focusing seat is provided with an adjustment cavity vertically penetrating the focusing seat;

[0007] A lens barrel is movably inserted into the adjustment cavity, and the lens barrel is connected to the inner wall of the adjustment cavity with a clearance fit;

[0008] The focusing assembly includes a first driving unit, which includes a rotatable transmission wheel and a transmission rod. A horizontally arranged driving groove is provided on the lens barrel. The transmission rod is eccentrically arranged relative to the transmission wheel. One end of the transmission rod is fixedly connected to the transmission wheel, and the other end of the transmission rod is inserted into the driving groove. The rotating transmission wheel can drive the lens barrel to move in the vertical direction of the adjustment cavity through the transmission rod.

[0009] Furthermore, a "C"-shaped groove is provided on the focusing seat, the "C"-shaped groove is cooperated with the transmission wheel, the transmission rod is horizontally inserted into the "C"-shaped groove, and the transmission rod can move along the "C"-shaped groove.

[0010] Furthermore, the diameter of the transmission rod is consistent with the width of the "C"-shaped groove.

[0011] Furthermore, the driving groove is arranged along the tangential direction of the lens barrel, and the outer circular surface of the transmission rod abuts against the inner wall of the driving groove.

[0012] Furthermore, the first driving unit also includes a rotating driving member, which is fixedly connected to the focusing seat. The output end of the rotating driving member is rotationally connected to the transmission wheel through a gear, and the rotating driving member can drive the transmission wheel to rotate clockwise or counterclockwise.

[0013] Furthermore, at least one guide unit is provided between the lens barrel and the focusing seat, and the guide unit includes a guide groove and a guide member opened on the lens barrel, the guide groove is vertically arranged, and the guide member is inserted into the guide groove through the focusing seat to prevent the relative rotation of the lens barrel.

[0014] Furthermore, the lens barrel includes a barrel body and a lens, the lens is embedded in the barrel body, and the lens and the barrel body are connected by threads.

[0015] Furthermore, the focusing assembly also includes a second driving unit, which includes a magnetic ring and an excitation coil arranged to surround the lens. The excitation coil is arranged in the focusing seat, and the excitation coil can use magnetic force to act on the magnetic ring to drive the lens to rotate relative to the barrel.

[0016] Furthermore, the lens is embedded in the inner side of the magnetic ring and fixedly connected to the magnetic ring, and the outer circumferential surface of the magnetic ring is provided with an external thread.

[0017] In a second aspect, the utility model provides a laser cutter, comprising the aforementioned focusing device for a laser cutting head.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model provides a focusing device of a laser cutting head and a laser cutter, which are provided with a focusing assembly, wherein the focusing assembly includes a first driving unit, the first driving unit includes a rotatable transmission wheel and a transmission rod, a horizontally arranged driving groove is opened on the lens barrel, the transmission rod is eccentrically arranged relative to the transmission wheel, one end of the transmission rod is fixedly connected to the transmission wheel, and the other end of the transmission rod is inserted into the driving groove, and during the rotation of the transmission wheel, the transmission rod can drive the transmission rod to rotate eccentrically, so that the transmission rod performs a circular motion around the axis of the transmission wheel, and the transmission rod drives the lens barrel to move vertically along the focusing seat while moving horizontally relative to the lens barrel, thereby automatically adjusting the focal length of the laser, so that the energy of the laser is more concentrated and the cutting efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of the utility model from a top view;

[0023] Figure 3 yes Figure 2 Schematic diagram of the cross section along the AA direction;

[0024] Figure 4 This is a side structural diagram of the focusing seat in the utility model;

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross section along the middle BB direction;

[0026] Figure 6 yes Figure 4 Schematic diagram of the cross section in the CC direction;

[0027] Figure 7 This is a schematic structural diagram of the cooperation between the lens barrel and the first driving unit in the utility model;

[0028] Figure 8 yes Figure 3 A schematic diagram of the structure of the local enlargement at M;

[0029] Figure 9 It is a structural diagram of the lens in the utility model;

[0030] Figure 10 It is a structural diagram of the laser head in the utility model.

[0031] In the figure, 100-focusing seat, 110-adjusting cavity, 120-"C" shaped groove;

[0032] 200-lens barrel, 210-driving slot, 220-barrel, 230-lens;

[0033] 300-focusing assembly, 310-first driving unit, 311-transmission wheel, 312-transmission rod, 313-rotation driving member, 320-guide unit, 321-guide groove, 322-guide member, 330-second driving unit, 331-magnetic ring, 332-excitation coil;

[0034] 400-Laser head. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0036] A focusing device of a laser cutting head and a laser cutter in this embodiment relate to the field of laser cutting technology. By arranging two sets of driving units in the focusing device, the driving units can roughly and precisely adjust the distance between the lens 230 and the part to be cut, thereby automatically adjusting the focal length of the laser, making the laser energy more concentrated and the cutting efficiency higher.

[0037] See also Figures 1 to 10 In this embodiment, a focusing device of a laser cutting head includes a focusing seat 100, a lens barrel 200 and a focusing assembly 300. The lens barrel 200 is movably installed in the focusing seat 100. The focusing device drives the lens barrel 200 to move relative to the focusing seat 100, so that the focus of the laser beam changes, so that parts with a certain thickness can be better cut.

[0038] The focusing seat 100 is arranged on the laser head 400, and the laser head 400 is arranged relative to the parts. An adjustment cavity 110 is provided in the focusing seat 100 and vertically passes through the focusing seat 100. The lens barrel 200 is movably inserted into the adjustment cavity 110. The lens barrel 200 is connected with the inner wall gap of the adjustment cavity 110. The lens barrel 200 can move vertically relative to the adjustment cavity 110, so that the focus of the laser changes along the vertical direction.

[0039] The focusing assembly 300 includes a first driving unit 310, which includes a rotatable transmission wheel 311 and a transmission rod 312. A horizontally arranged driving groove 210 is opened on the lens barrel 200, and the transmission rod 312 is eccentrically arranged relative to the transmission wheel 311. One end of the transmission rod 312 is fixedly connected to the transmission wheel 311, and the other end of the transmission rod 312 is inserted into the driving groove 210. When the transmission wheel 311 rotates, it can drive the transmission rod 312 to rotate eccentrically, so that the transmission rod 312 moves in a circular motion around the axis of the transmission wheel 311. While the transmission rod 312 moves horizontally relative to the lens barrel 200, it drives the lens barrel 200 to move vertically along the focusing seat 100, automatically adjusting the focal length of the laser, making the laser energy more concentrated and the cutting efficiency higher.

[0040] In some embodiments, see Figure 5A "C"-shaped groove 120 is provided on the focusing seat 100. The "C"-shaped groove 120 is coordinated with the transmission wheel 311. The central axis of the transmission wheel 311 is consistent with the central axis of the "C"-shaped groove 120. The transmission rod 312 is horizontally inserted into the "C"-shaped groove 120. When the transmission wheel 311 drives the transmission rod 312 to rotate, the rotation trajectory of the transmission rod 312 is consistent with the outline of the "C"-shaped groove 120. The transmission rod 312 can move along the "C"-shaped groove 120. During the movement, the transmission rod 312 drives the lens barrel 200 to move vertically along the focusing seat 100.

[0041] As a further embodiment, the diameter of the transmission rod 312 is consistent with the width of the "C"-shaped groove 120. The "C"-shaped groove 120 uses its own groove width as a constraint to limit the relative movement of the transmission rod 312, making the movement of the lens barrel 200 more stable.

[0042] In some embodiments, see Figure 5 and Figure 7 The driving groove 210 is arranged along the tangential direction of the lens barrel 200, and the outer circular surface of the transmission rod 312 abuts against the inner wall of the driving groove 210. The upper and lower sides of the transmission rod 312 always keep in contact with the upper and lower inner walls of the driving groove 210 and slide relatively. The transmission rod 312 can transmit the circumferential motion to the lens barrel 200 without time difference, avoiding collision and vibration between the transmission rod 312 and the lens barrel 200, which would interfere with the accuracy of the lens barrel 200.

[0043] In a specific implementation, when the end of the transmission rod 312 close to the transmission wheel 311 rotates to the extreme edges on both sides of the transmission wheel 311, the end of the transmission rod 312 away from the transmission wheel 311 is located in the middle of the "C"-shaped groove 120. When the transmission wheel 311 rotates counterclockwise or clockwise, the transmission rod 312 moves relative to the two closed ends of the "C"-shaped groove 120, driving the lens barrel 200 to move vertically upward or downward. The end of the transmission rod 312 away from the transmission wheel 311 is also located in the middle position of the drive groove 210. When the transmission wheel 311 rotates counterclockwise or clockwise, the transmission rod 312 moves relative to the two sides of the drive groove 210.

[0044] In some embodiments, see Figures 1 to 3 The first driving unit 310 also includes a rotating driving member 313, which is specifically a servo motor. The rotating driving member 313 is fixedly connected to the focusing seat 100. The output end of the rotating driving member 313 can drive the transmission wheel 311 to rotate, thereby driving the lens barrel 200 to move vertically along the focusing seat 100.

[0045] As a further implementation, see Figure 6The output end of the rotary drive member 313 is rotationally connected to the transmission wheel 311 via gears. The torque from the rotary drive member 313 is transmitted to the transmission wheel 311 via the gears. This gear coordination increases the output torque and improves the load capacity of the servo motor. Furthermore, the gears reduce transmission errors, and by selecting a reduction ratio, these errors can be minimized, thereby improving control accuracy. This allows for more stable movement of the lens barrel 200, enabling more precise adjustment of the laser focus.

[0046] In some embodiments, see Figure 5 and Figure 7 At least one guide unit 320 is provided between the lens barrel 200 and the focusing seat 100. The guide unit 320 includes a guide groove 321 and a guide member 322 provided on the lens barrel 200. The guide groove 321 is vertically arranged, and the guide member 322 is inserted into the guide groove 321 through the focusing seat 100. The guide member 322 always keeps in cooperation with the guide groove 321. Under the action of the guide member 322, the lens barrel 200 can only move along the guide groove 321. The guide member 322 can hinder the relative rotation of the lens barrel 200, so that the vertical movement of the lens barrel 200 is more stable and the migration of the laser focus is more continuous and accurate.

[0047] In some embodiments, see Figure 3 The lens barrel 200 includes a barrel body 220 and a lens 230. The lens 230 is embedded in the barrel 200. The lens 230 and the barrel 200 are connected by threads. When the lens 230 is driven by the outside world to rotate relative to the barrel body 220, the lens 230 can achieve fine feeding with the help of the lead of the thread, thereby more accurately controlling the change of the laser focus.

[0048] In the specific implementation process, please refer to Figure 3 and Figure 9 The focusing assembly 300 also includes a second driving unit 330. The second driving unit 330 includes a magnetic ring 331 and an excitation coil 332 that are arranged to enclose the lens 230. The excitation coil 332 is arranged in the focusing seat 100. The excitation coil 332 can generate a magnetic field that acts on the magnetic ring 331. Using the principle of a brushless motor, the changing magnetic field can drive the magnetic ring 331 to rotate relative to it, thereby driving the lens 230 to rotate and feed, and move vertically relative to the barrel 220 to complete the control of the focus position.

[0049] During use, especially when encountering thin plate parts, especially thin plate parts with high melting point and strength, such as titanium alloy plates, the adjustment range of the first drive unit 310 is too large and cannot effectively adapt to the thickness of the parts. Through the second drive unit 330, the lens 230 can be fine-tuned to complete the precise cutting of the thin plate parts, thereby obtaining better cutting accuracy and efficiency.

[0050] See also Figure 9 The lens 230 is embedded in the inner side of the magnetic ring 331 and fixedly connected to the magnetic ring 331. The outer surface of the magnetic ring 331 is provided with an external thread, which can be screwed together with the internal thread located on the inner side of the cylinder 220. The magnetic ring 331 is provided with multiple permanent magnets, which are arranged equidistantly around the central axis of the magnetic ring 331. The permanent magnets interact with the excitation coil 332, causing the magnetic ring 331 to rotate relative to the magnetic ring 331.

[0051] See also Figure 10 A laser cutter includes a focusing device of a laser cutting head as described above, wherein the focusing device is mounted on a laser head 400, and the laser head 400 is mounted on a multi-axis machine tool, which can perform cutting processing on parts.

[0052] The laser cutter first uses a multi-axis motion mechanism to move the laser head 400 to the part to be cut. The laser is then activated, and the laser beam converges under the action of the lens barrel 200. The servo motor drives the transmission wheel 311 to rotate, which in turn drives the lens barrel 200 downward via the transmission rod 312, so that the laser beam focuses on the surface of the part and cuts the part. As the surface of the part is cut, the laser penetrates deeper into the part, and the lens barrel 200 continues to move downward, driving the focus downward, so that the laser energy is always concentrated on the cutting surface, achieving optimal cutting efficiency.

[0053] The above description is only a preferred specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A focusing device for a laser cutting head, characterized in that: include: A focusing seat is arranged on the laser head, wherein the focusing seat is provided with an adjustment cavity vertically penetrating the focusing seat; A lens barrel is movably inserted into the adjusting cavity, and the lens barrel is connected with the inner wall of the adjusting cavity by gap fit; A focusing assembly, wherein the focusing assembly comprises a first driving unit, wherein the first driving unit comprises a rotatable transmission wheel and a transmission rod, wherein a horizontally arranged driving groove is provided on the lens barrel, wherein the transmission rod is eccentrically arranged relative to the transmission wheel, wherein one end of the transmission rod is fixedly connected to the transmission wheel, and the other end of the transmission rod is inserted into the driving groove, and the rotating transmission wheel can drive the lens barrel to move in the vertical direction of the adjustment cavity through the transmission rod.

2. The focusing device of a laser cutting head according to claim 1, characterized in that: The focusing seat is provided with a "C"-shaped groove, the "C"-shaped groove is matched with the transmission wheel, the transmission rod is horizontally inserted in the "C"-shaped groove, and the transmission rod can move along the "C"-shaped groove.

3. The focusing device of a laser cutting head according to claim 2, characterized in that: The diameter of the transmission rod is consistent with the width of the "C"-shaped groove.

4. The focusing device of a laser cutting head according to claim 1, characterized in that: The driving groove is arranged along the tangential direction of the lens barrel, and the outer circumferential surface of the transmission rod abuts against the inner wall of the driving groove.

5. The focusing device of a laser cutting head according to claim 1, characterized in that: The first driving unit also includes a rotating driving member, which is fixedly connected to the focusing seat, and an output end of the rotating driving member is rotationally connected to the transmission wheel through a gear, and the rotating driving member can drive the transmission wheel to rotate clockwise or counterclockwise.

6. The focusing device of a laser cutting head according to claim 1, characterized in that: At least one guide unit is provided between the lens barrel and the focusing seat, and the guide unit comprises a guide groove and a guide member provided on the lens barrel, wherein the guide groove is vertically provided, and the guide member is inserted into the guide groove through the focusing seat to prevent the relative rotation of the lens barrel.

7. The focusing device of a laser cutting head according to claim 1, characterized in that: The lens barrel comprises a barrel body and a lens, wherein the lens is embedded in the barrel body, and the lens is connected to the barrel body via threads.

8. The focusing device of a laser cutting head according to claim 7, characterized in that: The focusing assembly also includes a second driving unit, which includes a magnetic ring and an excitation coil that surround the lens. The excitation coil is arranged in the focusing seat, and the excitation coil can use magnetic force to act on the magnetic ring to drive the lens to rotate relative to the barrel.

9. The focusing device of a laser cutting head according to claim 8, characterized in that: The lens is embedded in the inner side of the magnetic circle and fixedly connected to the magnetic circle. The outer circumferential surface of the magnetic circle is provided with an external thread.

10. A laser cutter, characterized in that: A focusing device for a laser cutting head comprising the device as described in any one of claims 1 to 9.