CN110899958A

CN110899958A - Handheld laser processing head and laser processing equipment

Info

Publication number: CN110899958A
Application number: CN201911360136.2A
Authority: CN
Inventors: 蒋修青; 朱小杰
Original assignee: Gangchun Laser Technology (jiangsu) Co Ltd
Current assignee: Gangchun Laser Technology (jiangsu) Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-03-24

Abstract

The invention discloses a handheld laser processing head and laser processing equipment, and belongs to the technical field of laser processing. The laser processing equipment comprises a handheld laser processing head, wherein the handheld laser processing head comprises an optical fiber connecting assembly, a collimating mirror assembly, a focus motion control assembly, a focusing mirror assembly and a nozzle which are sequentially arranged from one end to the other end; the focus motion control assembly includes a housing, a wedge optic, a drive member, and a mirror. The two ends of the shell are respectively connected with the collimating mirror assembly and the focusing mirror assembly. The wedge-shaped lens is arranged in the shell, and the wedge-shaped lens and the collimating lens of the focusing lens component are arranged in parallel at intervals. The driving component can drive the wedge-shaped lens to rotate around the central axis of the wedge-shaped lens. The reflection lens is arranged between the wedge-shaped lens and the focusing lens of the focusing lens assembly and used for reflecting the rotating laser beam to the focusing lens of the focusing lens assembly. The invention realizes the circular motion of the focus light spot and can meet the requirements of various welding processes.

Description

Handheld laser processing head and laser processing equipment

Technical Field

The invention relates to the technical field of laser processing, in particular to a handheld laser processing head and laser processing equipment.

Background

Laser in the market is more and more widely applied, wherein laser welding is particularly prominent, among numerous laser welding, handheld welding develops abnormally and rapidly due to the advantages of simple and convenient operation, high flexibility, easiness in use, smooth welding surface, high quality and the like, but most of the existing handheld welding heads are in laser immobilization and single spot welding, so that the welding bead is single in type, the welding process is poor, and the requirements of various welding processes cannot be met.

Disclosure of Invention

The invention aims to provide a handheld laser processing head which can realize the movement of a focus light spot, thereby meeting various welding process requirements.

Another object of the present invention is to provide a laser processing apparatus that can meet various welding process requirements.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hand-held laser processing head comprises an optical fiber connecting assembly, a collimating mirror assembly, a focusing mirror assembly and a nozzle which are sequentially arranged from one end to the other end, wherein a focus motion control assembly is arranged between the collimating mirror assembly and the focusing mirror assembly;

the focus motion control assembly includes:

a housing having two ends connected to the collimating mirror assembly and the focusing mirror assembly, respectively;

the wedge-shaped lens is arranged in the shell and is arranged in parallel with the collimating lens of the collimating lens assembly at intervals;

a drive component capable of driving the wedge lens to rotate about a central axis of the wedge lens; and

a mirror disposed between the wedge-shaped mirror and the focusing mirror of the focusing mirror assembly, the mirror configured to reflect the rotating laser beam to the focusing mirror of the focusing mirror assembly.

Preferably, the focus motion control assembly further includes a lens barrel, the lens barrel is rotatably disposed in the housing, the wedge lens is mounted in the lens barrel, and the driving member can drive the lens barrel to rotate so as to drive the wedge lens to rotate.

Preferably, the focus motion control assembly further comprises a position adjustment assembly for adjusting an angle of the mirror plate.

Preferably, the position adjustment assembly includes:

the reflecting lens is embedded in the mirror support;

the adjusting part, the mirror support passes through the adjusting part connect in the casing, the adjusting part is used for adjusting the angle of mirror support.

Preferably, a focusing protection mirror assembly is arranged between the focusing mirror assembly and the nozzle, and the focusing protection mirror assembly can prevent external dirt from entering from the nozzle to pollute the focusing mirror.

Preferably, the focus protection mirror assembly:

the first connecting seat is connected to the focusing mirror assembly, the first connecting seat is of a hollow structure, and protective lenses parallel to the focusing mirror are arranged in the first connecting seat at intervals;

the second connecting seat is embedded at one side of the first connecting seat, and the edge of the protective lens is in sealing connection with the inner wall of the first connecting seat and the second connecting seat;

the first connecting seat is connected with a protective gas interface, and the gas path homogenizing assembly can homogenize gas flow in the second connecting seat, blow the homogenized gas flow to the protective lens, and blow the homogenized gas flow out of the bottom in the second connecting seat after being reflected by the protective lens.

Preferably, the nozzle comprises:

one end of the spray rod is connected with the focusing protection mirror assembly; and

and the spray head is in threaded connection with the other end of the spray rod.

Preferably, the hand-held laser machining head further comprises a water cooling system comprising:

the water inlet channel sequentially penetrates through the collimating mirror assembly, the focus motion control assembly and the focusing mirror assembly;

the water outlet channel sequentially penetrates through the focusing mirror assembly, the focus motion control assembly and the collimating mirror assembly;

wherein, the terminal of water inlet channel encircles and sets up in the nozzle, and with water outlet channel intercommunication.

Preferably, a holding portion is connected between the housing and the optical fiber connecting assembly, the optical fiber connecting assembly is connected to one end of the holding portion, and the collimating mirror assembly is mounted inside the other end of the holding portion.

A laser processing device comprises the handheld laser processing head.

The invention has the beneficial effects that:

the focus motion control assembly is arranged between the collimating mirror assembly and the focusing mirror assembly of the handheld laser processing head and comprises a wedge-shaped lens, the wedge-shaped lens is driven to rotate around the central axis of the wedge-shaped lens by the driving component, laser beams are reflected by the rotating wedge-shaped lens through the reflecting lens and focused by the focusing mirror assembly, and then circular motion of focus light spots can be realized, so that various welding process requirements can be met.

Drawings

Fig. 1 is a schematic perspective view of a hand-held laser machining head according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a hand-held laser machining head according to an embodiment of the present invention;

FIG. 3 is an enlarged partial schematic view of FIG. 2 at A;

FIG. 4 is a schematic perspective view of a focus motion control assembly according to an embodiment of the present invention;

FIG. 5 is a schematic side view of a focusing protective mirror assembly and nozzle of a hand held laser machining head according to an embodiment of the present invention;

fig. 6 is a schematic perspective sectional view of fig. 5 at a-a.

In the figure:

1. an optical fiber connection assembly; 11. an optical fiber connector; 2. a grip portion; 3. a focus motion control assembly; 31. a housing; 32. a wedge-shaped lens; 33. a drive member; 331. a drive motor; 332. a conveyor belt; 34. a mirror plate; 35. a lens barrel; 36. a position adjustment assembly; 361. a lens holder; 3611. pressing a plate; 362. an adjustment section; 3621. a fixing member; 3622. an adjustment member; 37. a dust cover; 4. a focus protection mirror assembly; 41. protecting the lens; 42. a first connecting seat; 43. an inner ring of gas; 431. air holes; 44. an air flow groove; 45. a shielding gas interface; 46. a second connecting seat; 5. a nozzle; 51. a spray rod; 511. an annular water tank; 52. a spray head; 6. a collimating mirror assembly; 61. a collimating lens; 7. a focusing mirror assembly; 71. a focusing lens; 8. and (4) connecting the blocks.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to fig. 1 to 6.

The present embodiment discloses a laser processing apparatus including a hand-held laser processing head. A hand-held laser processing head in this embodiment, as shown in fig. 1 to 3, includes an optical fiber connection assembly 1, a collimator lens assembly 6, a focusing lens assembly 7, and a nozzle 5, which are sequentially arranged from one end to the other end. A focus motion control assembly 3 is arranged between the collimating mirror assembly 6 and the focusing mirror assembly 7.

The focus motion control assembly 3 comprises a housing 31, a wedge 32, a driving member 33 and a mirror 34, wherein the two ends of the housing 31 are connected to the collimating mirror assembly 6 and the focusing mirror assembly 7, respectively. The wedge 32 is disposed within the housing 31, and the wedge 32 is spaced parallel to the collimating lens 61 of the collimating lens assembly 6. The driving member 33 is capable of driving the wedge lens 32 to rotate around the central axis of the wedge lens 32. The reflection mirror 34 is disposed between the wedge mirror 32 and the focusing mirror 71 of the focusing mirror assembly 7, and the reflection mirror 34 is used for reflecting the rotating laser beam to the focusing mirror 71 of the focusing mirror assembly 7.

Laser beams can be incident from the optical fiber connecting component 1, are collimated by the collimating mirror component 6 and reflected to the focusing mirror component 7 after rotating and rotating by the focus motion control component 3, and pass through the nozzle 5 to perform laser processing on a workpiece.

The utility model provides a be provided with focus motion control assembly 3 between collimating mirror subassembly 6 and the focusing mirror subassembly 7 of hand-held type laser beam machining head in this embodiment, focus motion control assembly 3 includes wedge lens 32, drives wedge lens 32 through drive part 33 and rotates around the central axis of wedge lens 32, and the laser beam passes through rotatory wedge lens, reflects through reflection lens 34 to focus through focusing mirror subassembly 7 after, can realize the circular motion of focus facula, thereby can satisfy multiple welding process requirement.

In order to facilitate the use of the hand-held laser processing head by an operator during processing, a holding portion 2 is connected between the housing 31 and the optical fiber connecting assembly 1, the optical fiber connecting assembly 1 is connected to one end of the holding portion 2, and the collimating mirror assembly 6 is installed inside the other end of the holding portion 2. Specifically, the grip portion 2 is a hollow structure to allow a laser beam to pass therethrough. The holding part 2 is set to be the length which can be conveniently held by an operator, and the holding part 2 is convenient to operate. The optical fiber connection assembly 1 has a locking structure, and can lock the optical fiber rod in the optical fiber connection port 11 of the optical fiber connection assembly 1. The collimator lens assembly 6 is mounted inside the grip portion 2, which saves space and makes the structure of the hand-held laser processing head more compact.

Further, in order to enable the wedge lens 32 to automatically rotate, the focus motion control assembly 3 further includes a lens barrel 35, the lens barrel 35 is rotatably disposed in the housing 31, the wedge lens 32 is installed in the lens barrel 35, and the driving part 33 can drive the lens barrel 35 to rotate so as to drive the wedge lens 32 to rotate. The lens barrel 35 is rotatably connected in the housing 31 through two bearings, and the bearings are deep groove ball bearings. The inside step that is provided with of lens cone 35, wedge lens 32 one end butt is on the step, and the other end is fixed through the clamping ring, can prevent that wedge lens 32 from rocking. The driving part 33 includes a driving motor 331 disposed on one side of the lens barrel 35, the driving motor 331 drives the lens barrel 35 to rotate through the conveying belt 332, so as to drive the wedge-shaped lens 32 to rotate, specifically, the conveying belt is a round belt, and the lens barrel 35 is provided with a groove matched with the round belt. The laser beam passes through the rotating wedge 32, thereby achieving a difference in the position of the laser beam refracted out through the wedge 32.

In order to ensure that the axis of the laser beam of the rotating motion reflected by the mirror plate 34 can pass through the center of the focusing lens 71, as shown in fig. 4, the focus motion control assembly 3 further includes a position adjusting assembly 36, and the position adjusting assembly 36 is used for adjusting the angle of the mirror plate 34.

Specifically, the position adjustment assembly 36 includes a mirror holder 361 and an adjustment portion 362, and the mirror plate 34 is embedded in the mirror holder 361. The mirror holder 361 is connected to the housing 31 via an adjusting portion 362, and the adjusting portion 362 is used to adjust the angle of the mirror holder 361. The mirror holder 361 can facilitate the installation and fixation of the mirror plate 34, and the angle of the mirror holder 361 is adjusted by the adjusting part 362, thereby realizing the angle adjustment of the mirror plate 34. Specifically, the adjusting portion 362 includes a fixing element 3621 and three adjusting elements 3622, the fixing element 3621 and the three adjusting elements 3622 are respectively disposed at four corners of the mirror support 361, the fixing element 3621 is a first screw rod passing through the mirror support 361 and connected to the housing 31 in a threaded manner, the adjusting element 3622 is a second bolt passing through the mirror support 361 and connected to the housing 31 in a threaded manner, a gap is disposed between the mirror support 361 and the housing 31, a spring is sleeved on the second bolt between the mirror support 361 and the housing 31, and a sleeve is sleeved on the first bolt between the mirror support 361 and the housing 31. A pressing plate 3611 is pressed on the mirror plate 34, and the pressing plate 3611 can fix the mirror plate 34 in the mirror holder 361. A dust cover 37 is disposed above the pressing plate 3611, and the mirror plate 34 is accommodated in a closed space formed by the housing 31 and the dust cover 37 to prevent external dust from entering and contaminating the mirror plate 34.

The laser beam is reflected by the reflecting lens 34 and reaches the focusing lens component 7 to be converged into a point light source, so that the circular motion of the focal spot is realized, and the welding can be realized by utilizing the high energy of the focal spot. In order to prolong the service life of the focusing lens 71, as shown in fig. 1 and 2, a focusing protective lens assembly 4 is arranged between the focusing lens assembly 7 and the nozzle 5, and the focusing protective lens assembly 4 can prevent external dirt from entering the nozzle 5 to pollute the focusing lens 71.

As shown in fig. 6, the focus protection lens assembly 4 includes a first connecting seat 42, a second connecting seat 46, and an air channel homogenizing assembly. The first connecting seat 42 is connected to the focusing lens assembly 7, the first connecting seat 42 is a hollow structure, and the first connecting seat 42 is provided therein with a protection lens 41 disposed in parallel to the focusing lens 71 at an interval. The second connecting seat 46 is embedded in one side of the first connecting seat 42, and the edge of the protection lens 41 forms a sealing connection with the inner wall of the first connecting seat 42 and the second connecting seat 46. The first connecting seat 42 is connected to a shielding gas interface 45, and the gas path homogenizing assembly can homogenize the gas flow in the second connecting seat 46, blow the homogenized gas flow to the protective lens 41, and blow the homogenized gas flow out of the bottom of the second connecting seat 46 after being reflected by the protective lens 41. The gas path homogenizing assembly can homogenize gas flow in the first connecting seat 42, blow the homogenized gas flow to the protective lens, blow the homogenized gas flow out of the bottom of the first connecting seat 42 after being reflected by the protective lens 41, enable the gas flow to flow out uniformly and stably after being homogenized through reflection of the protective lens 41, rapidly blow away molten metal through uniform and stable high-speed gas flow, and improve laser cutting quality. Meanwhile, the airflow blowing to the protection lens 41 can prevent the protection lens 41 from depositing dust to pollute the protection lens 41, and can also take away heat generated by the protection lens 41, thereby prolonging the service life of the protection lens 41.

Specifically, the air path homogenizing assembly comprises an air inner ring 43, the air inner ring 43 is arranged in the first connecting seat 42, outer walls at two ends of the air inner ring 43 are hermetically connected with an inner wall of the first connecting seat 42, an annular air flow groove 44 is formed between an outer wall at the middle section and the inner wall of the first connecting seat 42, a plurality of air holes 431 which incline upwards to the protective lens 41 are arranged on the wall of the air inner ring 43, and the air holes 431 are uniformly distributed along the circumferential direction of the air inner ring 43 and are communicated with the air flow groove 44; the air flow channel 44 is in communication with an external air flow source via a shield air interface 45. After the airflow is uniformly dispersed in the airflow groove 44, the airflow is further homogenized through the air hole 431, and the smoothness of the airflow is ensured. In order to improve the homogenization effect of the gas flow, the inclination angle of the gas holes 431 is optionally 45 degrees. Tests show that when the inclination angle of the air holes 431 is 45 degrees, the homogenization effect of the air flow is relatively good. Further, the number of the air holes 431 is set to 4.

The converged light passes through the protective lens 41 and then is emitted from the nozzle 5. As shown in fig. 6, the spray nozzle 5 includes a spray bar 51 and a spray head 52, and one end of the spray bar 51 is connected to the focus protection lens assembly 4. Spray head 52 is threadably connected to the other end of spray bar 51. The nozzle 5 can be stretched and retracted by the threaded connection of the spray head 52 and the spray rod 51, so that the relative position of the nozzle 5 and the focus light spot is adjusted, the distance from the focus light spot to the workpiece is changed, the size of the focus light spot on the workpiece can be changed, the welding width and the welding depth are changed, and the optimal protection effect is achieved.

In order to ensure that the laser processing head in the embodiment has a better cooling effect and can be suitable for occasions with high power processing, the handheld laser processing head further comprises a water cooling system, and the water cooling system comprises a water inlet channel and a water outlet channel. The water inlet channel sequentially penetrates through the collimating lens assembly 6, the focus motion control assembly 3 and the focusing lens assembly 7. The water outlet channel sequentially penetrates through the focusing mirror assembly 7, the focus motion control assembly 3 and the collimating mirror assembly 6. Wherein, the tail end of the water inlet channel is arranged in the nozzle 5 in a surrounding way and is communicated with the water outlet channel. Furthermore, the water inlet channel passes through the focusing mirror assembly 7 and then passes through the focusing protective mirror assembly 4, an annular water tank 511 is arranged at one end of the spray rod 51 connected with the focusing protective mirror assembly 4, and the tail end of the water inlet channel is arranged in the annular water tank 511. The spray rod 51 and the focusing mirror protection assembly are connected through a connecting block 8, the connecting block 8 is connected with a boss extending into the annular water tank 511, and the boss is located between an outlet of the water inlet cooling channel and an inlet of the water outlet cooling channel, so that cooling water can flow out of the water outlet cooling channel after surrounding a circle in the annular water tank 511. The heat of the nozzle 5 can be effectively taken away by the cooling water flowing through the spray rod 51, and a good cooling effect is achieved, so that the laser processing head in the embodiment can be suitable for high-power processing occasions.

The focus motion control assembly 3 is arranged between the collimating lens assembly 6 and the focusing lens assembly 7 of the handheld laser processing head in the embodiment of the invention, the focus motion control assembly 3 comprises a wedge-shaped lens 32, the wedge-shaped lens 32 is driven to rotate around the central axis of the wedge-shaped lens 32 through a driving part 33, a laser beam is reflected by a reflecting lens 34 through the rotating wedge-shaped lens and focused by the focusing lens assembly 7, and then circular motion of a focus light spot can be realized, so that various welding process requirements can be met. In addition, the service life of the focusing lens 71 can be prolonged by arranging the focusing protective lens assembly 4, and the quality of laser processing can be improved by the air channel homogenizing assembly.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hand-held laser processing head comprises an optical fiber connecting component (1), a collimating mirror component (6), a focusing mirror component (7) and a nozzle (5) which are sequentially arranged from one end to the other end, and is characterized in that a focus motion control component (3) is arranged between the collimating mirror component (6) and the focusing mirror component (7);

the focus motion control assembly (3) comprises:

a housing (31), both ends of the housing (31) being connected to the collimator mirror assembly (6) and the focusing mirror assembly (7), respectively;

a wedge lens (32), wherein the wedge lens (32) is arranged in the shell (31), and the wedge lens (32) is arranged in parallel with the collimating lens (61) of the collimating lens assembly (6) at a spacing;

a drive component (33), the drive component (33) being capable of driving the wedge lens (32) to rotate about a central axis of the wedge lens (32); and

a mirror (34), the mirror (34) being arranged between the wedge-shaped mirror (32) and the focusing mirror (71) of the focusing mirror assembly (7), the mirror (34) being adapted to reflect the rotating laser beam to the focusing mirror (71) of the focusing mirror assembly (7).

2. The hand-held laser machining head according to claim 1, characterized in that the focus motion control assembly (3) further comprises a lens barrel (35), the lens barrel (35) being rotatably arranged in the housing (31), the wedge lens (32) being mounted in the lens barrel (35), the drive member (33) being capable of driving the lens barrel (35) in rotation to bring about the rotation of the wedge lens (32).

3. Hand-held laser machining head according to claim 1, characterised in that the focus motion control assembly (3) further comprises a position adjustment assembly (36), the position adjustment assembly (36) being used to adjust the angle of the mirror plate (34).

4. Hand-held laser machining head according to claim 3, characterised in that the position adjustment assembly (36) comprises:

the mirror holder (361), the said reflecting mirror (34) is embedded in the said mirror holder (361);

the mirror support (361) is connected to the shell (31) through the adjusting part (362), and the adjusting part (362) is used for adjusting the angle of the mirror support (361).

5. Hand-held laser machining head according to claim 1, characterised in that a focusing protective mirror assembly (4) is arranged between the focusing mirror assembly (7) and the nozzle (5), the focusing protective mirror assembly (4) being able to prevent external dirt from entering from the nozzle (5) and contaminating the focusing mirror (71).

6. Hand-held laser machining head according to claim 5, characterised in that the focusing protective mirror assembly (4):

the first connecting seat (42) is connected to the focusing mirror assembly (7), the first connecting seat (42) is of a hollow structure, and protective lenses (41) which are parallel to the focusing lens (71) and arranged at intervals are arranged in the first connecting seat (42);

the second connecting seat (46), the second connecting seat (46) is embedded at one side of the first connecting seat (42), and the edge of the protective lens (41) is in sealing connection with the inner wall of the first connecting seat (42) and the second connecting seat (46);

the first connecting seat (42) is connected with a protective gas interface (45), and the gas path homogenizing assembly can homogenize gas flow in the second connecting seat (46), blow the homogenized gas flow to the protective lens (41), and blow the homogenized gas flow out of the bottom of the second connecting seat (46) after being reflected by the protective lens (41).

7. Hand-held laser machining head according to claim 5, characterised in that the nozzle (5) comprises:

a spray bar (51), wherein one end of the spray bar (51) is connected with the focusing protection mirror assembly (4); and

a spray head (52), wherein the spray head (52) is connected to the other end of the spray rod (51) in a threaded mode.

8. Hand-held laser machining head according to any of claims 1 to 7, characterised in that the hand-held laser machining head further comprises a water cooling system comprising:

the water inlet channel sequentially penetrates through the collimating mirror assembly (6), the focus motion control assembly (3) and the focusing mirror assembly (7);

the water outlet channel sequentially penetrates through the focusing mirror assembly (7), the focus motion control assembly (3) and the collimating mirror assembly (6);

wherein the tail end of the water inlet channel is arranged in the nozzle (5) in a surrounding way and is communicated with the water outlet channel.

9. Hand-held laser machining head according to any of claims 1-7, characterised in that a grip (2) is connected between the housing (31) and the fibre optic connection assembly (1), the fibre optic connection assembly (1) being connected to one end of the grip (2), the collimating mirror assembly (6) being mounted inside the other end of the grip (2).

10. A laser machining apparatus comprising a hand-held laser machining head as claimed in any one of claims 1 to 9.