Laser focal length adjusting assembly and laser cutting device

Abstract

The utility model discloses a laser focal length adjusting assembly and a laser cutting device, and relates to the technical field of laser cutting equipment, the laser focal length adjusting assembly comprises a support assembly and a focal length adjusting mechanism, the support assembly comprises a fixing support and a QBH optical fiber connector which are connected, the fixing support is provided with a laser outlet, and the QBH optical fiber connector is provided with a lens. The QBH optical fiber connector is used for installing a laser and is provided with a laser emission port. The focal length adjusting mechanism comprises a sliding rail, a sliding block, a mirror base and a collimating mirror, the sliding rail is arranged on the fixing support, the sliding block is slidably connected with the sliding rail, the mirror base is connected with the sliding block, the mirror base is hollow and is provided with two open ends, and the collimating mirror is arranged in the mirror base. The collimating mirror is arranged on the mirror base, the mirror base is connected with the sliding block, the sliding block can slide on the sliding rail in a reciprocating mode to drive the collimating mirror to be close to or away from the QBH optical fiber connector so as to change the diameter of the laser beam passing through the collimating mirror, and the change of the focal length of the laser beam passing through the focusing mirror can be greatly changed through up-down short-distance movement of the collimating mirror.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting equipment, in particular to a laser focal length adjustment component and a laser cutting device. Background Art

[0002] Laser cutting uses a high-power, focused laser beam to scan the surface of a material, heating it to several thousand or even tens of thousands of degrees Celsius in a very short time, causing it to melt or vaporize instantly. High-pressure gas is then used to blow the molten or vaporized material away through the cut, achieving the desired effect. Due to its advantages of fast cutting speed, high production efficiency, and excellent cut end surface quality, laser cutting has become one of the leading methods for cutting sheet metal and is gaining increasing popularity.

[0003] The prior art with announcement number CN204053226U discloses a focal length adjustment mechanism of a laser cutting head, in which a rotating tube is sleeved on the lower part of a fixed tube and is threadedly connected, and the movable tube includes a first tube body and a second tube body connected from top to bottom, and the outer wall of the first tube body is provided with at least one longitudinal groove, and the upper end of the second tube body protrudes outward to form an outer tube, the first tube body is provided in the fixed tube and the rotating tube, and the second tube body extends out of the rotating tube, and the lower end of the rotating tube protrudes inward to form an inner ring, and the outer ring and the inner ring are tightly arranged from top to bottom; each fixing screw is provided on the tube wall of the fixed tube, and the top end passes through the fixed tube and is located in the corresponding longitudinal groove; a locking ring is sleeved on the second tube body and is threadedly connected, and the upper end face of the locking ring is arranged tightly against the lower end face of the rotating tube; a height scale is provided longitudinally on the outer wall of the tube body of the fixed tube, and an angle scale is provided on the circumference of the outer wall of the rotating tube.

[0004] However, this prior art still has some shortcomings. For example, it mainly relies on threaded connections between corresponding components and rotates the components relative to each other to fine-tune the laser focal length. When a large adjustment of the laser focal length is required, this structure becomes inefficient and thus needs to be improved. Utility Model Content

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a laser focal length adjustment component and a laser cutting device to solve the problem that in the prior art, the laser focal length of the laser cutting head is mainly achieved through the threaded connection of the corresponding components, and the laser focal length is fine-tuned by rotating the components relative to each other. When the laser focal length needs to be adjusted significantly, this structure becomes inefficient, and therefore there is a technical problem that needs to be improved.

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

[0007] In a first aspect, the present invention provides a laser focus adjustment assembly, comprising:

[0008] A bracket assembly, comprising a fixed bracket and an optical fiber connector connected to each other, wherein the fixed bracket is provided with a laser outlet, and the optical fiber connector is used to install a laser and is provided with a laser emission port; and

[0009] The focus adjustment mechanism includes a slide rail, a slider, a mirror seat and a collimating mirror. The slide rail is provided on the fixed bracket, the slider is slidably connected to the slide rail, the mirror seat is connected to the slider and is located between the laser emission port and the laser outlet, the mirror seat is hollow with openings at both ends, and the collimating mirror is provided inside the mirror seat.

[0010] In some embodiments, the focal length adjustment mechanism also includes an adjusting motor and a screw, the screw threaded through the slider, the adjusting motor is connected to the screw and can drive the screw to rotate, and when the screw rotates, it can drive the slider to slide back and forth along the slide rail through the thread, thereby driving the collimating mirror to move back and forth between the laser emission port and the laser outlet.

[0011] In some embodiments, the focal length adjustment mechanism further includes a bearing seat provided on the fixed bracket, the bearing seat is located between the adjustment motor and the slider, and the bearing seat is sleeved on the screw rod and can limit the screw rod.

[0012] In some embodiments, the slider is detachably connected to the mirror base via a screw, and the slider and the mirror base are arranged on both sides of the fixing bracket in a thickness direction.

[0013] In the second aspect, the utility model also provides a laser cutting device, including a housing, a first reflector, a second reflector and the above-mentioned laser focal length adjustment component, the housing including a first optical channel, a second optical channel and a third optical channel arranged at an angle in sequence; the first optical channel is connected to the laser outlet, and the laser entering the laser emission port can pass through the collimating mirror to irradiate the first reflector, and the first reflector can reflect the laser through the second optical channel, and then reflect it through the second reflector through the third optical channel.

[0014] In some embodiments, the second light channel is perpendicular to the first light channel and the third light channel, and the first light channel and the third light channel are located on different sides of the second light channel.

[0015] In some embodiments, the laser cutting device also includes a driving assembly and a laser head, the driving assembly includes a first adjustment mechanism, the laser head is arranged in the housing and is used to emit the laser reflected by the second reflector to cut the workpiece, the first adjustment mechanism is connected to the laser head and can drive the laser head to rotate around the central axis of the first optical channel.

[0016] In some embodiments, the first adjustment mechanism includes a first motor and a first passive gear, the housing includes a first shell and a second shell that are rotatably connected, the first shell has the first light channel, the second shell has the second light channel and the third light channel, the central axis of the first passive gear coincides with the central axis of the first light channel, the first passive gear is connected to the second shell, and the first motor has a first driving gear and engages the first passive gear through the first driving gear.

[0017] In some embodiments, the driving assembly includes a second adjustment mechanism, which is disposed in the second housing and is used to drive the laser head to rotate, and the rotation center axis of the laser head coincides with the center axis of the second optical channel.

[0018] In some embodiments, the housing also includes a third shell, which is rotatably connected to the second shell, and the second adjustment mechanism includes a second motor and a second passive gear, the second passive gear is connected to the third shell, the second motor is arranged in the second shell, and the second motor has a second driving gear and engages the second passive gear through the second driving gear.

[0019] Compared to the prior art, the fiber optic connector provided by the laser cutting device of the present invention can be used to install a laser. The scattered laser light emitted by the laser can be irradiated by the collimator through the laser emission port, and the collimator converts the scattered laser light into a parallel beam. The collimator is mounted on a lens holder, which is connected to a slider. The slider can slide back and forth on a slide rail to drive the collimator lens toward or away from the QBH fiber optic connector, thereby changing the diameter of the laser beam after passing through the collimator lens. The short up and down movement of the collimator lens can significantly change the focal length of the laser beam after it finally passes through the focusing lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a laser focus adjustment assembly provided by an embodiment of the present utility model from one viewing angle;

[0021] Figure 2 This is a structural schematic diagram of a laser focus adjustment assembly provided by an embodiment of the present utility model from another perspective;

[0022] Figure 3 1 is a cross-sectional schematic diagram of a laser focus adjustment assembly provided by an embodiment of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of a laser cutting device provided by an embodiment of the present utility model;

[0024] Figure 5 It is a cross-sectional schematic diagram of a laser cutting device provided by an embodiment of the present utility model;

[0025] Figure 6 This is a laser light path diagram of the laser cutting device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] To address the technical issues in existing laser cutting heads, where the laser emission path is a straight line and the laser cutting head cannot adjust the laser emission direction when rotating about its central axis, resulting in a small laser emission range and difficulty in meeting the requirements of more complex cutting processes, the present utility model provides a laser cutting device that can offset the laser emission outlet to expand the laser emission range during rotation, thereby completing more complex laser cutting processes. Furthermore, a focal length adjustment mechanism can be used to change the laser focal length to meet the cutting requirements of different processes.

[0028] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a laser focus adjustment assembly 100 in one embodiment of the present invention. The laser focus adjustment assembly 100 includes a bracket assembly 5 and a focus adjustment mechanism 6. The bracket assembly 5 includes a fixed bracket 51 and a fiber optic connector 52 connected to each other. The fixed bracket 51 has a laser outlet 511. The fiber optic connector 52 is used to mount a laser and has a laser emission port 521. After the laser is connected to the fiber optic connector 52, the fiber optic connector 52 can be driven to emit laser light toward the laser emission port 521. The fiber optic connector 52 can be a QBH fiber optic connector. In this embodiment, the focus adjustment mechanism 6 includes a slide rail 61, a slider 62, a mirror base 63, and a collimating mirror 64. The slide rail 61 is provided on the fixed bracket 51. The slider 62 is slidably connected to the slide rail 61. The mirror base 63 is connected to the slider 62 and is located between the laser emission port 521 and the laser outlet 511. The mirror base 63 is hollow with two ends open. The collimating mirror 64 is located inside the mirror base 63. The laser light emitted by the laser can be irradiated onto the collimator 64 through the laser emission port 521 , and the collimator 64 can convert the laser light astigmatism into a parallel beam.

[0029] As the slider 62 slides back and forth on the slide rail 61, it can drive the collimator 64 closer to or away from the QBH fiber optic connector. When the collimator 64 approaches the QBH fiber optic connector, the area of laser light scattered on the collimator 64 becomes larger, and vice versa. The size of the laser focus formed by the focusing lens 34 is also different. Therefore, the position of the collimator 64 can be selectively adjusted according to the actual thickness of the workpiece to be cut so that the laser that finally cuts the workpiece can complete the cutting task. Since the slider 62 slides along the slide rail 61 over a large range, the focal length of the laser can be adjusted to a large extent, and the adjustment is quick and convenient. When the slider 62 slides back and forth on the slide rail 61, the slider 62 drives the collimator 64 closer to or away from the QBH fiber optic connector to change the diameter of the laser beam after passing through the collimator 64. The short reciprocating movement of the collimator 64 can significantly change the change in the focal length of the laser beam after it finally passes through the focusing lens 34, and the adjustment is quick and convenient.

[0030] In one embodiment, see Figure 2 The focal length adjustment mechanism 6 also includes an adjustment motor 65 and a screw 66. The screw 66 is threaded through the slider 62. The adjustment motor 65 is connected to the screw 66 and can drive the screw 66 to rotate. When the screw 66 rotates, it can drive the slider 62 to slide back and forth along the slide rail 61 through the thread, thereby driving the collimator 64 to move back and forth between the laser emission port 521 and the laser outlet 511. In this embodiment, the adjustment motor 65 drives the screw 66 to rotate, and the screw 66 drives the slider 62 to slide back and forth through the thread engagement, thereby adjusting the position of the collimator 64. This not only allows for fine-tuning the position of the collimator 64, but also allows for large-scale adjustment of the position of the collimator 64, which is highly practical. In other embodiments, the telescopic rod of the cylinder can also be connected to the slider 62, and the telescopic rod can be extended and retracted to drive the slider 62 to slide back and forth.

[0031] In one embodiment, see Figure 2 The focal length adjustment mechanism 6 further includes a bearing seat 67 disposed on the fixed bracket 51. The bearing seat 67 is located between the adjustment motor 65 and the slider 62. The bearing seat 67 is sleeved on the screw rod 66 and can limit the position of the screw rod 66. The bearing seat 67 has a bearing, the inner ring of which is sleeved on the screw rod 66, allowing the screw rod 66 to rotate smoothly. The bearing seat 67 is disposed on the fixed bracket 51 and is fixed, which can effectively limit the position of the screw rod 66, so that the screw rod 66 can more stably drive the slider 62 to slide back and forth when rotating.

[0032] In one embodiment, see Figure 2 and Figure 3The slider 62 is detachably connected to the mirror base 63 via a screw 68, so that the slider 62 and the mirror base 63 can be easily disassembled and assembled. The slider 62 and the mirror base 63 are arranged on both sides of the fixed bracket 51 in the thickness direction, so that the space of the fixed bracket 51 can be fully utilized and can also help to play a balancing role.

[0033] See also Figure 4 and Figure 5 In a second aspect, the present invention further provides a laser cutting device 200, comprising a housing 1, a first reflector 23, a second reflector 24, and the aforementioned laser focus adjustment assembly 100. The housing 1 comprises a first optical channel 11, a second optical channel 12, and a third optical channel 13, which are arranged at an angle to each other. The first optical channel 11 is connected to the laser outlet 511. The laser light entering the laser emission port 521 can pass through the collimator 64 and illuminate the first reflector 23. The first reflector 23 can reflect the laser light through the second optical channel 12, and then through the second reflector 24 and reflect it through the third optical channel 13.

[0034] The first reflector 23 is located at the connection between the first optical channel 11 and the second optical channel 12, and the second reflector 24 is located at the connection between the second optical channel 12 and the third optical channel 13. The laser light emitted by the laser passes through the collimating mirror 64 and enters the laser outlet 511, then enters the first optical channel 11 and irradiates the first reflector 23. The first reflector 23 can reflect the laser light through the second optical channel 12, and then through the second reflector 24 to pass through the third optical channel 13, and then pass through the focusing mirror 34 to be emitted to form a laser light that can be used to cut the workpiece. Since the first optical channel 11, the second optical channel 12 and the third optical channel 13 are arranged at an angle in sequence, the laser light finally emitted deviates from the first optical channel 11. When the laser cutting device 200 rotates around the first optical channel 11, the cutting position of the laser light can be adjusted, for example, to make a circular cut on the workpiece.

[0035] In one embodiment, see Figure 5 , the second optical channel 12 is perpendicular to the first optical channel 11 and the third optical channel 13, and the first optical channel 11 and the third optical channel 13 are located on different sides of the second optical channel 12. In this embodiment, the first optical channel 11, the second optical channel 12 and the third optical channel 13 roughly form a Z shape, so that the laser can deviate from the first optical channel 11 after being emitted from the third optical channel 13. When the housing 1 rotates about the central axis of the first optical channel 11, the position of the laser emitted from the third optical channel 13 will also change accordingly. The laser irradiation range is large and can meet more complex cutting processes. In other embodiments, the angles formed by the second optical channel 12 and the first optical channel 11 and the third optical channel 13 can also be other angles, such as 45° or 60°, which can be determined according to the actual cutting process requirements.

[0036] In one embodiment, see Figure 5 The laser cutting device 200 further includes a first adjustment mechanism 31 and a laser head 33. The laser head 33 is mounted on the housing 1 and is used to emit the laser light reflected by the second reflector 24. The first adjustment mechanism 31 is connected to the laser head 33 and can drive the laser head 33 to rotate around the central axis of the first optical channel 11 to adjust the laser emission direction of the laser head 33. For example, when a circular cut is required on a workpiece, the first adjustment mechanism 31 can be used to control the laser head 33 to move in a circular motion around the central axis of the first optical channel 11.

[0037] In one embodiment, see Figure 5 The first adjustment mechanism 31 includes a first motor 311 and a first passive gear 312. The housing 1 includes a first shell 16 and a second shell 17 that are rotatably connected. The first shell 16 is provided with the above-mentioned first optical channel 11, and the second shell 17 is provided with the second optical channel 12 and the third optical channel 13. The central axis of the first passive gear 312 coincides with the central axis of the first optical channel 11. The first passive gear 312 is connected to the second shell 17. The first motor 311 has a first driving gear 313 and engages with the first passive gear 312 through the first driving gear 313. In this embodiment, when the first motor 311 drives the first driving gear 313 to rotate, it can drive the first passive gear 312 to rotate through engagement. The first passive gear 312 is connected to the second shell 17 by screws. The above-mentioned laser head 33 is located in the second shell 17, so it can drive the laser head 33 to rotate around the central axis of the first optical channel 11 to perform circular cutting.

[0038] In one embodiment, see Figure 5 The drive assembly 3 includes a second adjustment mechanism 32, which is disposed within the second housing 17 and is used to rotate the laser head 33. The rotation axis of the laser head 33 coincides with the central axis of the second optical channel 12. In this embodiment, the second adjustment mechanism 32 can be used to drive the laser head 33 to rotate about the second optical channel 12, further expanding the cutting range of the laser head 33 and enabling more complex cutting processes.

[0039] In one embodiment, see Figure 5The housing 1 further includes a third housing 18, which is rotatably connected to the second housing 17. The second adjustment mechanism 32 includes a second motor 321 and a second passive gear 322, which is connected to the third housing 18. The second motor 321 is disposed on the second housing 17. The second motor 321 has a second driving gear 323, which engages with the second passive gear 322 via the second driving gear 323. In this embodiment, when in operation, the second motor 321 is capable of driving the second driving gear 323 to rotate, and the second driving gear 323, through engagement, drives the second passive gear 322 to rotate. Since the second passive gear is connected to the third housing 18 via screws, it can drive the third housing 18 to rotate relative to the second housing 17, thereby driving the laser head 33 on the third housing 18 to rotate about the second optical channel 12.

[0040] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the utility model is described in detail:

[0041] The optical fiber connector 52 of the laser cutting device 200 provided by the present invention can be used to install the laser 69. Specifically, the optical fiber connector 52 is a QBH optical fiber connector. After the QBH optical fiber connector is connected to the laser 69, it can emit laser light. The laser light can be irradiated on the collimator 64 through the laser emission port, and the laser light is converted into a parallel light beam through the collimator 64. The collimator 64 is arranged on a mirror seat, and the mirror seat 63 is connected to the slider 62. When the slider 62 slides back and forth on the slide rail 61, the slider 62 drives the collimator 64 to move closer to or away from the QBH optical fiber connector to change the diameter of the laser beam after passing through the collimator 64. The reciprocating movement of the collimator 64 over a short distance can greatly change the change in the focal length of the laser beam after it finally passes through the focusing lens 34. The adjustment is quick and convenient, saving time and effort.

[0042] In addition, the laser light sequentially passes through the first optical channel 11, the second optical channel 12, and the third optical channel 13, which are arranged at an angle. Therefore, after being emitted, the laser light will deviate from the first optical channel 11. The first adjustment mechanism 31 can drive the laser head 33 to rotate about the central axis of the first optical channel 11, while the second adjustment mechanism 32 can drive the laser head 33 to rotate about the central axis of the second optical channel 12. This allows the laser head 33 to have a large cutting range and meet the needs of more complex cutting processes.

[0043] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A laser focus adjustment assembly, characterized in that: include: A bracket assembly includes a fixed bracket and an optical fiber connector connected to each other, wherein the fixed bracket is provided with a laser outlet, and the optical fiber connector is used to install a laser and is provided with a laser emission port; and The focus adjustment mechanism includes a slide rail, a slider, a mirror seat and a collimating mirror. The slide rail is provided on the fixed bracket, the slider is slidably connected to the slide rail, the mirror seat is connected to the slider and is located between the laser emission port and the laser outlet, the mirror seat is hollow with openings at both ends, and the collimating mirror is provided inside the mirror seat.

2. The laser focus adjustment assembly according to claim 1, characterized in that: The focal length adjustment mechanism also includes an adjustment motor and a screw rod. The screw rod is threaded through the slider. The adjustment motor is connected to the screw rod and can drive the screw rod to rotate. When the screw rod rotates, it can drive the slider to slide back and forth along the slide rail through the thread, thereby driving the collimating mirror to move back and forth between the laser emission port and the laser outlet.

3. The laser focus adjustment assembly according to claim 2, characterized in that: The focal length adjustment mechanism further includes a bearing seat provided on the fixed bracket, wherein the bearing seat is located between the adjustment motor and the slider, and the bearing seat is sleeved on the screw rod and can limit the position of the screw rod.

4. The laser focus adjustment assembly according to claim 2, characterized in that: The slider is detachably connected to the mirror base via a screw, and the slider and the mirror base are arranged on both sides of the fixing bracket in a thickness direction.

5. A laser cutting device, characterized in that: The laser focus adjustment device comprises a housing, a first reflector, a second reflector, and the laser focus adjustment assembly according to any one of claims 1 to 4, wherein the housing comprises a first optical channel, a second optical channel, and a third optical channel arranged at an angle to each other; the first optical channel is connected to the laser outlet, and the laser entering the laser emission port can pass through the collimator to illuminate the first reflector, and the first reflector can reflect the laser through the second optical channel and then through the second reflector to reflect through the third optical channel.

6. The laser cutting device according to claim 5, characterized in that: The second light channel is perpendicular to the first light channel and the third light channel, and the first light channel and the third light channel are located on different sides of the second light channel.

7. The laser cutting device according to claim 5, characterized in that: The laser cutting device also includes a drive assembly and a laser head. The drive assembly includes a first adjustment mechanism. The laser head is arranged on the housing and is used to emit the laser reflected by the second reflector to cut the workpiece. The first adjustment mechanism is connected to the laser head and can drive the laser head to rotate around the central axis of the first optical channel.

8. The laser cutting device according to claim 7, characterized in that: The first adjustment mechanism includes a first motor and a first passive gear, the housing includes a first shell and a second shell that are rotatably connected, the first shell has the first light channel, the second shell has the second light channel and the third light channel, the central axis of the first passive gear coincides with the central axis of the first light channel, the first passive gear is connected to the second shell, the first motor has a first driving gear and meshes with the first passive gear through the first driving gear.

9. The laser cutting device according to claim 8, characterized in that: The driving assembly includes a second adjusting mechanism, which is provided in the second housing and is used to drive the laser head to rotate. The rotation center axis of the laser head coincides with the center axis of the second optical channel.

10. The laser cutting device according to claim 9, characterized in that: The housing also includes a third shell, which is rotatably connected to the second shell. The second adjustment mechanism includes a second motor and a second passive gear. The second passive gear is connected to the third shell. The second motor is arranged in the second shell. The second motor has a second driving gear and engages with the second passive gear through the second driving gear.

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