Laser head of laser cutting machine

Abstract

The utility model belongs to the technical field of laser cutting equipment, and particularly relates to a laser head of a laser cutting machine, which comprises a laser irradiation unit, a laser cutting unit and a laser cutting unit, the diagonal reflector assembly is used for reflecting a laser beam emitted by the laser irradiation unit; the tubular sleeve is communicated with the diagonal reflector assembly and extends downwards from an outlet of the diagonal reflector assembly; a laser nozzle in optical communication with the tubular sleeve and having an inlet and an internal passage leading to its conical tip; wherein a focusing lens is arranged in the laser nozzle, the laser nozzle is adjustably connected to the tubular sleeve, the truncated conical tip of the laser nozzle is used for guiding laser along a linear path from an inlet of the laser nozzle to a workpiece, and compared with the prior art, the cutting effect of the laser cutting machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laser cutting equipment technical field especially, it relates to a laser head of laser cutting machine. BACKGROUND

[0002] The laser cutting machine is a kind of high-precision automation equipment using laser beam as cutting tool.It realizes quick and accurate cutting by focusing laser beam to material surface.The laser cutting machine is widely used in various industries, especially in the processing of textile, leather, metal, wood, plastic, paper and other materials;The existing laser cutting machine usually emits laser beam by laser emitter, and laser beam barrel reflector and lens system focus to form a small high-energy laser spot, so as to cut material, and the laser head is the unit where reflector and lens system are located, and it is an indispensable part of the laser cutting machine;

[0003] The existing laser head is prone to misalignment during use in fabric processing, which causes the light beam, lens and nozzle to be unable to effectively align, resulting in cutting yellow edge, and the edge of the fabric is prone to charring or sticking due to high-temperature melting during cutting, further reducing the cutting effect, so it is necessary to improve. INVENTION CONTENTS

[0004] The utility model aims at the above-mentioned technical problem, provides a kind of laser head of laser cutting machine, to effectively improve the cutting effect of laser cutting machine.

[0005] Therefore, the utility model provides a kind of laser head of laser cutting machine, comprising:

[0006] Laser irradiation unit, the laser irradiation unit is used to irradiate laser to the surface of workpiece;

[0007] Further comprising:

[0008] Diagonal line reflector assembly, the diagonal line reflector assembly is used to reflect the laser beam emitted by laser irradiation unit;

[0009] Tubular sleeve, the tubular sleeve is communicated with diagonal line reflector assembly and extends downward from the outlet of diagonal line reflector assembly;

[0010] Laser nozzle, the laser nozzle is optically communicated with tubular sleeve and has inlet and internal passage leading to own conical tip;

[0011] Wherein, the laser nozzle has focusing lens inside and is adjustably connected to tubular sleeve, and the frustoconical tip of the laser nozzle is used to guide laser along linear path from laser nozzle inlet to workpiece.

[0012] In the technical solution, the laser head emits a laser beam in the working process, the laser beam is reflected by the diagonal mirror assembly and passes through the tubular sleeve to irradiate the paper laser nozzle, and finally irradiates the surface of the workpiece through the focusing lens in the laser nozzle to perform mechanical cutting operation.

[0013] In the above technical solution, further comprising:

[0014] A water chamber is located in the irradiation path of the laser irradiated by the focusing lens, and is provided with an additional lens, a water jet nozzle for jetting water in the laser irradiation direction, and a water supply and a water supply unit for pressurization;

[0015] An additional liquid jet unit is provided separately from the irradiation path of the laser and is configured to jet liquid to the workpiece;

[0016] A valve is in communication with the water supply unit, the water chamber and the additional liquid jet unit;

[0017] A control unit includes a sensor for detecting the surface state of the workpiece, and the control unit can receive the state of the surface of the workpiece from the sensor to control the jetting amount or jetting frequency of the liquid jetted from the additional liquid jet unit, the communication between the water supply unit and the water chamber, or the communication between the water supply unit and the additional liquid jet unit.

[0018] In the above technical solution, further, the jetting cross-sectional area of the water jetted by the water jet nozzle is larger than the irradiation cross-sectional area of the laser.

[0019] In the above technical solution, further, the additional liquid jet unit is configured to jet water containing a surfactant.

[0020] In the above technical solution, further, the laser nozzle is adjustably connected to the tubular sleeve through an adapter, and the adapter is threadedly connected to the tubular sleeve for thread adjustment along a linear path.

[0021] The beneficial effects of the present application are:

[0022] 1. The laser nozzle is adjustably connected to the tubular sleeve, so that the position between the laser nozzle and the tubular sleeve can be adjusted to reduce the alignment deviation, thereby reducing the occurrence of cutting yellow edge and improving the cutting effect of the laser cutting machine.

[0023] 2. By the arrangement of the water chamber, the laser beam concentrates energy through total reflection of the water flow, prolongs the effective processing distance, reduces scattering, ensures the uniformity of processing, at the same time, the water flow synchronously cools the processing area and removes debris, reduces the edge scorching or sticking caused by high temperature melting, and keeps the cutting surface clean;

[0024] 3. By the arrangement of the additional liquid spraying unit, the surface active agent reduces the surface tension, makes the water flow dispersed quickly, avoids accumulation, and prevents water droplets from remaining which may cause uneven dyeing or subsequent processing problems. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0026] Figure 1 The present application is a specific embodiment structure schematic diagram.

[0027] Figure 2 The present application is a front view structure schematic diagram.

[0028] Figure 3 The present application is a top view structure schematic diagram.

[0029] Figure 4 The present application is a bottom view structure schematic diagram.

[0030] Figure 5 The present application is a water chamber structure schematic diagram.

[0031] The marks in the figure represent:

[0032] 1, laser irradiation unit; 2, diagonal mirror assembly; 3, tubular sleeve; 4, laser nozzle; 5, focusing lens; 6, water chamber; 7, additional lens; 8, water spraying nozzle; 9, water supply unit; 10, additional liquid spraying unit; 11, valve; 12, control unit; 13, sensor; 14, adapter; 15, laser beam. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0035] According to an embodiment of the present application, a laser head of a laser cutting machine, comprising: a laser irradiation unit 1, the laser irradiation unit 1 is used to irradiate laser beam 15 to the surface of the workpiece; further comprising: diagonal mirror assembly 2, the diagonal mirror assembly 2 is used to reflect the laser beam 15 emitted by the laser irradiation unit 1; tubular sleeve 3, the tubular sleeve 3 communicates with the diagonal mirror assembly 2 and extends downward from the outlet of the diagonal mirror assembly 2; laser nozzle 4, the laser nozzle 4 is in optical communication with the tubular sleeve 3 and has an inlet and an internal passage leading to its own conical tip; wherein the laser nozzle 4 has a focusing lens 5 inside and the laser nozzle 4 is adjustably connected to the tubular sleeve 3, the truncated conical tip of the laser nozzle 4 is used to guide the laser along a linear path from the laser nozzle 4 inlet to the workpiece. The laser beam 15 emitted by the laser irradiation unit 1 is redirected by the diagonal mirror assembly 2, the diagonal mirror assembly 2 includes a housing, a positioning mirror, and the laser beam 15 is adjusted diagonally within the housing and downward through the hollow tubular sleeve 3.

[0036] The positioning mirror redirects the laser light downward through a downwardly extending tubular sleeve 3 which is cylindrical along its length and can be permanently or removably attached to the housing, in one preferred embodiment the tubular sleeve 3 is 35mm in length and 22mm in internal diameter. Importantly, the tubular sleeve 3 has an adjustment thread at its lower end which is either externally or internally threaded, the adjustment thread preferably having a pitch diameter in the range R such as 0.2mm - 0.8mm, most preferably in the range R such as 0.2 - 0.5mm. An adaptor 14 is threadably adjustable onto the tubular sleeve 3, extending from the corner mirror assembly 2 and can fine tune the input or output as required, the adaptor 14 again having an upper end which is either internally or externally threaded, the upper end having a matching adjustment thread in the pitch range R. The adaptor 14 has a threaded lower aperture into which the laser nozzle 4 is inserted directly with a screw (this is a fixed non-adjustable screw attachment), the adaptor 14 lower aperture thread pitch preferably being in the range R such as 0.2mm - 1mm, optimally 0.5mm. Preferably, the outer surface of the adaptor 14 is textured to provide a finger grip.

[0037] The laser nozzle 4 comprises an upper cylindrical collar which contains the primary focusing lens 5 and lens holder. The conical tip of the laser nozzle 4 can be configured as an industry standard sonic laser nozzle 4. Alternatively, the conical tip of the laser nozzle 4 can be configured as a supersonic minimum length laser nozzle 4 (inset base). The lens holder can comprise conventional focusing / aligning optics which focus the laser beam 15 through the laser nozzle 4 tip, where the laser beam 15 forms a point focus on the target. For example, a single plano-convex lens mounted in an adjustable lens bed can be used to focus the laser output to a spot.

[0038] The laser nozzle 4 can be conveniently height set by adjusting the distance of the adaptor 14. This screw adjustment serves to maintain the precise height of the laser nozzle 4 and makes adjustment easier, this aspect is particularly important for fabric applications where the need for focusing / alignment is more intense and more frequent and accurate focusing is required, the thread fit assembly ensures that the laser beam 15 is always correctly aligned with the focusing lens and the laser nozzle 4 opening does not need to be adjusted. The positioning mirror in the corner mirror assembly 2 is used for lens to beam to laser nozzle 4 alignment, preferably a smaller 50mm focusing lens 5 is used, the lower focal length of the lens assembly provides a much wider operating window and uniform laser settings across all fabric backing combinations.

[0039] In another embodiment of the present invention, the laser head further comprises a water chamber 6, an additional liquid jet unit 10, a valve 11, a water supply unit 9 and a control unit 12, the water chamber 6 can further comprise an additional lens 7 for additionally concentrating the laser light and a water jet nozzle 8 for jetting water in the direction of the laser light irradiation.

[0040] When the laser beam 15 is irradiated into the water stream ejected from the water chamber 6, the laser beam 15 irradiated into the water stream causes total reflection at the interface between the water and the air, and thus the laser beam 15 flows into the processing portion along the water stream without divergence, can be effectively focused, and the processing length can be controlled to be long.

[0041] The water stream ejected from the water chamber 6, by the total reflection of the laser beam 15, not only increases the processing length of the laser beam 15, but also rapidly cools the heat generated by the laser processing in the processing area, prevents thermal damage, and can play a role in rapidly removing by-products generated during processing.

[0042] The liquid ejected by the additional liquid ejection unit 10 can be a mixture of a liquid such as water and a material capable of reducing the surface tension of water such as a surfactant, and the surfactant can be sprayed onto the workpiece surface by the additional liquid ejection unit before the laser beam 15 irradiation for laser processing.

[0043] By this process, the surface tension of the water droplets present on the processing surface is reduced, and the water is dispersed without accumulating on the processing surface. Even if a part of the scattered water remains on the processing surface, due to the reduction of the surface tension, the height of the water is very low, and the polarity is weakened, so it is easy to be scattered by the water sprayed by the laser, without affecting the processing.

[0044] At this time, the additional liquid ejection unit 10 can also spray liquid just before the laser irradiation from the laser irradiation unit 1 by the control of the control unit 12, and the additional liquid ejection unit can directly spray water mixed with a surfactant, or it can be configured to pass through a surfactant supply unit during water spraying, and spray the mixed surfactant just before spraying.

[0045] Meanwhile, the laser head according to the present application can further include a sensor 13 for checking the state of the processing surface. The sensor 13 can be a camera or the like, and can be configured to, for example, transmit the presence or amount of water droplets on the processing surface to the control unit 12 before processing, and the control unit 12 can adjust the amount of liquid sprayed from the additional liquid ejection unit 10 based on information from the sensor 13.

[0046] In some cases, the sensor 13 additionally senses the processing surface after the liquid is sprayed by the additional liquid ejection unit 10 and provides information to the control unit 12, thereby multiplexing the liquid spraying by the additional liquid ejection unit 10.

[0047] The water chamber 6 is connected to the additional liquid ejection unit 10 and can be controlled by the valve 11, and according to the control signal from the control unit 12, the valve 11 makes the water supply unit 9 communicate with the water chamber 6, and makes the water supply unit 9 communicate with the additional liquid ejection unit 10. It can also be configured to communicate with the water chamber 6 and the additional liquid ejection unit 10 at the same time.

[0048] The control unit 12, in the case where it is judged by the sensor 13 that there is no water on the processing surface and processing can be performed, causes the valve 11 to communicate with the water supply unit 9 and the water chamber 6 to perform water supply, which can be configured to be sprayed together with the laser into the processing area.

[0049] On the other hand, the control unit 12, in the case where it is judged by the sensor 13 that there is water on the processing surface and the water needs to be removed before processing, causes the valve 11 to cause the water supply unit 9 and the additional liquid spraying unit 10 to act. It is configured to communicate and supply the additional liquid to the processing surface by the additional liquid spraying unit 10.

[0050] The embodiments of the present application are described above in conjunction with the drawings, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, the present application is not limited to the specific embodiments described above, the specific embodiments described above are only illustrative, not restrictive, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, all of which belong to the protection of the present application.

Claims

1. A laser head of a laser cutting machine, comprising: a laser irradiation unit (1) for irradiating a laser beam (15) to a surface of a workpiece; characterized by further comprising: a diagonal mirror assembly (2) for reflecting the laser beam (15) emitted from the laser irradiation unit (1); a tubular sleeve (3) in communication with the diagonal mirror assembly (2) and extending downward from an outlet of the diagonal mirror assembly (2); a laser nozzle (4) in optical communication with the tubular sleeve (3) and having an inlet and an internal passage leading to a self-conical tip; wherein the laser nozzle (4) has a focusing lens (5) inside and is adjustably connected to the tubular sleeve (3), the truncated conical tip of the laser nozzle (4) being used to guide the laser along a linear path from the inlet of the laser nozzle (4) to the workpiece; further comprising: a water chamber (6) located in an irradiation path of the laser irradiated through the focusing lens (5) and provided with an additional lens (7) and a water jet nozzle (8) for jetting water in the direction of the laser irradiation, and a water supply unit (9) for supplying water and pressurizing; an additional liquid jet unit (10) disposed separately from the irradiation path of the laser and arranged to jet liquid to the workpiece; a valve (11) in communication with the water supply unit (9), the water chamber (6) and the additional liquid jet unit (10); a control unit (12) including a sensor (13) for detecting a state of the surface of the workpiece, the control unit (12) being able to receive the state of the surface of the workpiece from the sensor (13) to control the jet amount or the jet frequency of the liquid jetted from the additional liquid jet unit (10), the communication between the water supply unit (9) and the water chamber (6), or the communication between the water supply unit (9) and the additional liquid jet unit (10).

2. The laser head of the laser cutting machine according to claim 1, characterized in that: The water jetted by the water jet nozzle (8) has a jet cross-sectional area larger than an irradiation cross-sectional area of the laser.

3. The laser head of the laser cutting machine according to claim 2, characterized in that: The additional liquid jet unit (10) is configured to jet water containing a surfactant.

4. The laser head of the laser cutting machine according to claim 1, characterized in that: The laser nozzle (4) is adjustably connected to the tubular sleeve (3) through an adapter (14) which is threadedly connected to the tubular sleeve (3) for thread adjustment along the linear path.

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