Cooling nozzle and laser processing head

Abstract

The utility model discloses a cooling nozzle and a laser processing head, the cooling nozzle comprises a spraying side, a mounting side and a body part, the peripheral wall of the body part is provided with a cooling channel, the mounting side is provided with an air inlet hole, and the body part is internally provided with a cooling channel so as to convey cooling airflow to the cooling channel through the cooling channel. The cooling channel divides the body part into a first circular truncated cone section and a second circular truncated cone section, the groove wall, close to one side of the second circular truncated cone section, of the cooling channel forms a first surface, and an intersection is formed between the extension line of the outer wall of the first circular truncated cone section and the first surface; the first surface is divided into a transmission section close to the center of the cooling nozzle and a guide section deviating from the center of the cooling nozzle by the intersection, so that when cooling airflow flows through the guide section, the guide section can guide the cooling airflow to flow along the outer wall of the first circular truncated cone section, and the cooling airflow can take away heat of the first circular truncated cone section; the cooling effect of the cooling nozzle is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser processing technical field especially relates to a cooling nozzle and laser processing head. BACKGROUND

[0002] In laser processing, nozzle long -time use can lead to burnout, and the nozzle burns out and needs to replace the nozzle, and the laser processing head can work normally, generally, the nozzle is directly irradiated by high-energy laser beam, which leads to the nozzle internal temperature being too high, thereby leading to the nozzle burnout, the prior art adopts cooling gas to cool the nozzle, but the cooling effect is not good SUMMARY

[0003] The utility model discloses a cooling nozzle and laser processing head, which aims to solve the problem of poor cooling effect of the existing laser processing head.

[0004] In a first aspect, the utility model provides a kind of cooling nozzle, the cooling nozzle includes the installation side and the jet side of opposite arrangement, and the body part being arranged between the jet side and the installation side, the outer wall of the body part is equipped with cooling groove, the installation side is formed with air inlet hole, the body part is equipped with the cooling channel of the cooling groove and the air inlet hole communication;

[0005] The cooling groove separates the body part and forms the first circular table segment near the installation side and the second circular table segment near the jet side, the groove wall of the cooling groove near the second circular table segment forms first face, the intersection between the outer wall extension line of the first circular table segment and the first face, the intersection separates the first face and forms the transmission segment near the center of the cooling nozzle and the guide segment away from the center of the cooling nozzle.

[0006] In one embodiment, the cooling nozzle is equipped with the laser channel that passes through the jet side and the installation side, and the center line of the laser channel forms the axis of the cooling nozzle.

[0007] The angle between the outer wall extension line of the first circular table segment and the axis of the cooling nozzle is α, and the angle between the outer wall extension line of the second circular table segment and the axis of the cooling nozzle is β, and β is greater than α.

[0008] In one embodiment, β is less than 45 °, and / or,

[0009] The cooling nozzle is a bevel nozzle.

[0010] In one embodiment, the cooling nozzle is provided with a laser channel extending through the jetting side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle.

[0011] The cooling channels are provided in plurality, each of the cooling channels is uniformly distributed around the axis of the cooling nozzle, and an extension line of each of the cooling channels is provided at an acute angle with the axis of the cooling nozzle.

[0012] In one embodiment, the cooling nozzle is provided with a laser channel extending through the jetting side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle.

[0013] The cooling channel is an annular channel, and the cooling channel comprises an inner edge portion close to the axis of the cooling nozzle, an opening portion provided on an outer peripheral wall of the body portion, and an extension section connecting the inner edge portion and the opening portion;

[0014] A groove wall of the cooling channel away from the second frustum segment forms a second surface, and the extension section is an extension channel enclosed by the first surface and the second surface;

[0015] The first surface is an annular plane, and a first plane where the first surface is located is perpendicular to the axis of the cooling nozzle; or the first surface is a conical surface, the first surface extends at an angle from the inner edge portion to a direction away from the inner edge portion and the jetting side, and a line profile formed by a cross section of the first surface relative to the axis of the cooling nozzle is provided at an angle γ with a plane perpendicular to the axis of the cooling nozzle, 0 < γ ≤ 30°.

[0016] In one embodiment, an inner diameter of the cooling channel is not less than 2.0 mm; and / or,

[0017] The cooling channel extends from the gas inlet hole to the inner edge portion of the cooling channel.

[0018] In one embodiment, the cooling nozzle is provided with a laser channel extending through the jetting side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle.

[0019] The laser channel comprises an inlet end and an outlet end, and a converging section, an accelerating section and a launching section sequentially connected from the inlet end to the outlet end, an inner diameter of the converging section gradually decreases from the inlet end to the outlet end, an inner diameter of the accelerating section gradually decreases from the inlet end to the outlet end, and an inner diameter of the accelerating section at the outlet end is L1, an inner diameter of the accelerating section at the inlet end is L2, L1 + 1.6 mm ≤ L2 ≤ L1 + 2.4 mm.

[0020] The extension length of the accelerating section in the axis direction of the cooling nozzle is H1, the extension length of the emitting section in the axis direction of the cooling nozzle is H2, and 0.9H1≤H2≤1.1H1.

[0021] In one embodiment, the height dimension of the cooling channel in the straight line where the axis of the cooling nozzle is located is 1.0mm-3.0mm; and / or,

[0022] The distance between the cooling channel and the nozzle opening of the spraying side is 3.5mm-10.5mm.

[0023] In the second aspect, the utility model also provides a laser processing head, the laser processing head includes support body and the cooling nozzle of any one embodiment above,

[0024] The mounting side is detachably connected to the end of the support body close to the cooling nozzle side, and has a cooling gap between the end of the support body close to the cooling nozzle side; the end of the support body close to the cooling nozzle side is provided with a blowing hole.

[0025] The blowing hole is used for blowing the cooling airflow to the mounting side, part of the cooling airflow is discharged under the guidance of the cooling gap, and the other part of the cooling airflow is transmitted to the cooling channel through the cooling channel and discharged under the guidance of the cooling channel.

[0026] In one embodiment, an annular groove is formed on the mounting side, and the groove wall of the annular groove and the support body form the cooling gap; and / or,

[0027] The support body is a wind-cooled ceramic ring.

[0028] The utility model discloses the following beneficial effects are adopted in the embodiment:

[0029] The cooling nozzle of the utility model, because the outer peripheral wall of the body part is provided with the cooling channel, the body part is provided with the cooling channel that communicates the cooling channel and the air inlet hole, so that the cooling airflow is transmitted to the cooling channel through the cooling channel and is discharged under the guidance of the cooling channel, thereby cooling the cooling nozzle, and because the cooling channel is arranged between the spraying side and the mounting side, the distance between the cooling position and the spraying side can be reduced through the arrangement of the cooling channel, thereby enhancing the cooling and cooling effect of the spraying side of the cooling nozzle.

[0030] Further, since the intersection between the outer wall extension line of the first frustum segment and the first surface divides the first surface into a transmission segment close to the center of the cooling nozzle and a guide segment away from the center of the cooling nozzle, when the cooling gas flow passes through the guide segment, the guide segment can guide the cooling gas flow to flow along the outer wall of the first frustum segment, and the cooling gas flow can take away the heat of the first frustum segment, thereby further improving the cooling effect of the cooling nozzle.

[0031] Meanwhile, since the guide segment guides the cooling gas flow to flow along the outer wall of the first frustum segment, the cooling gas flow can be prevented from flowing to the jet side, thereby avoiding the interference of the cooling gas flow to the gas flow of the jet side, and further ensuring the laser processing quality of the cooling nozzle.

[0032] When the above cooling nozzle is applied to a laser processing head, since the cooling nozzle has a good cooling effect, the working time of the cooling nozzle can be increased, and the processing performance of the laser processing head in laser cutting, laser welding and other laser processing processes can be improved.

[0033] Further, the gas blowing hole blows the cooling gas flow to the mounting side, part of the cooling gas flow is discharged under the guidance of the cooling gap, thereby realizing the first layer nozzle cooling, and another part of the cooling gas flow is transmitted to the cooling groove through the cooling channel and discharged under the guidance of the cooling groove, thereby realizing the second layer nozzle cooling. Through the double-layer nozzle cooling, the cooling and cooling effect of the cooling nozzle can be improved, and the service life of the nozzle can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0035] Among them:

[0036] Figure 1 It is a front view of the laser processing head in an embodiment.

[0037] Figure 2 It is Figure 1 It is an enlarged view of part A in the figure.

[0038] Figure 3 It is Figure 1 It is a top view of the laser processing head shown in the figure.

[0039] Figure 4 It is Figure 3 It is a B-B sectional view in the figure.

[0040] Figure 5 It isFigure 4 Enlarged view of portion C.

[0041] Figure 6 Enlarged view of portion C. Figure 4 Enlarged view of portion D.

[0042] Figure 7 Enlarged view of portion D. Figure 1 Explotive view of the laser processing head.

[0043] Figure 8 Enlarged view of portion D. Figure 1 Top view of the cooling nozzle of the laser processing head.

[0044] Figure 9 Enlarged view of portion D. Figure 8 Sectional view along line E-E.

[0045] Figure 10 Enlarged view of portion F. Figure 9 Enlarged view of portion F.

[0046] Figure 11 Enlarged view of portion F. Figure 8 Sectional view of the cooling nozzle.

[0047] Figure 12 Partial sectional view of the cooling channel portion of the laser processing head of another embodiment.

[0048] 100, cooling nozzle; 110, jetting side; 120, mounting side; 121, air inlet hole; 122, annular groove; 130, body portion; 131, first circular segment; 132, second circular segment; 140, cooling channel; 141, first face; 142, intersection; 143, transmission segment; 144, guide segment; 145, inner edge portion; 146, opening portion; 147, extension segment; 148, second face; 150, cooling passage; 160, laser passage; 161, inlet end; 162, outlet end; 163, converging segment; 164, accelerating segment; 165, emitting segment; 166, interface;

[0049] 200, support body; 210, air blowing hole; 300, cooling gap. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0052] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0053] The embodiment of the present application discloses a kind of laser processing head, which can carry out laser cutting, laser welding and other laser processing technology to workpiece. Please refer to Figures 1 to 11 , the laser processing head of an embodiment includes laser head and cooling nozzle 100, cooling nozzle 100 is used to spray the laser beam emitted by laser head, so as to carry out laser processing to workpiece by laser beam.

[0054] In an embodiment, please refer to Figures 1 to 11 Cooling nozzle 100 includes oppositely arranged spray side 110 and mounting side 120, and body part 130 arranged between spray side 110 and mounting side 120, cooling groove 140 is opened on the outer peripheral wall of body part 130, air inlet hole 121 is formed on mounting side 120, cooling channel 150 is opened in body part 130, which is communicated with cooling groove 140 and air inlet hole 121, to deliver cooling airflow to cooling groove 140 through cooling channel 150, and discharge under the guidance of cooling groove 140, so as to cool cooling nozzle 100, since cooling groove 140 is arranged between spray side 110 and mounting side 120, the cooling position can be reduced by the arrangement of cooling groove 140 Distance from spray side 110, so as to enhance the cooling and cooling effect of spray side 110 of cooling nozzle 100.

[0055] In the embodiment, the cooling channel 140 divides the body part 130 into a first circular table section 131 close to the mounting side 120 and a second circular table section 132 close to the spraying side 110, and the groove wall close to the second circular table section 132 of the cooling channel 140 forms a first surface 141, the intersection 142 between the outer wall extension line of the first circular table section 131 and the first surface 141, and the intersection 142 divides the first surface 141 into a transmission section 143 close to the center of the cooling nozzle 100 and a guide section 144 away from the center of the cooling nozzle 100. Therefore, when the cooling airflow flows through the guide section 144, the guide section 144 can guide the cooling airflow to flow along the outer wall of the first circular table section 131, and the cooling airflow can take away the heat of the first circular table section 131 to further improve the cooling effect of the cooling nozzle 100.

[0056] It can be understood that, since the guide section 144 guides the cooling airflow to flow along the outer wall of the first circular table section 131, the cooling airflow can be prevented from flowing to the spraying side 110, so that the airflow interference of the cooling airflow to the spraying side 110 can be avoided, and the laser processing quality of the cooling nozzle 100 can be ensured.

[0057] Since the cooling nozzle 100 has a good cooling effect, the working time of the cooling nozzle 100 can be increased, and the processing performance of the laser processing head in laser cutting, laser welding and other laser processing processes can be improved.

[0058] In an embodiment, please refer to Figure 4 , Figures 8 to 10 , the cooling nozzle 100 is provided with a laser channel 160 penetrating through the spraying side 110 and the mounting side 120, and the center line of the laser channel 160 forms the axis of the cooling nozzle 100; the angle between the outer wall extension line of the first circular table section 131 and the axis of the cooling nozzle 100 is α, and the angle between the outer wall extension line of the second circular table section 132 and the axis of the cooling nozzle 100 is β, and β is greater than α. By such arrangement, the interference and blockage of the outer wall of the first circular table section 131 to the cooling airflow can be reduced, so that the cooling airflow can flow more smoothly along the outer wall of the first circular table section 131 away from the spraying side 110 of the cooling nozzle 100, not only the cooling and cooling effect of the cooling nozzle 100 is improved, but also the airflow interference of the cooling airflow to the spraying side 110 can be further reduced.

[0059] Further, please refer to Figure 9, β is less than 45°, i.e. 2β is less than 90°, so as to facilitate the machining of the cooling nozzle 100 with a bevel. Specifically, the cooling nozzle 100 is a bevel nozzle, so as to facilitate the machining of the cooling nozzle 100 with a bevel. The extension length of the axis direction of the existing bevel nozzle is relatively long, and when the cooling gas flow only cools the surface of the mounting side 120, the cooling effect of the spraying side 110 of the cooling nozzle 100 will be poor due to the long distance between the spraying side 110 of the cooling nozzle 100 and the cooling gas flow. In the present embodiment, a cooling groove 140 is additionally arranged between the spraying side 110 and the mounting side 120, and the cooling groove 140 can reduce the distance between the cooling position and the spraying side 110, thereby enhancing the cooling effect of the spraying side 110 of the cooling nozzle 100.

[0060] Of course, in other embodiments, β can also be equal to or less than α, but it is necessary to ensure that the outer wall extension line of the first circular cone section 131 and the first surface 141 have an intersection 142, so that the guide section 144 can guide the cooling gas flow along the outer wall of the first circular cone section 131, and the cooling gas flow can carry away the heat of the first circular cone section 131, thereby improving the cooling effect of the cooling nozzle 100.

[0061] In an embodiment, please refer to Figure 4 , Figure 8 and Figure 9 , the cooling channel 150 is provided with a plurality of cooling channels 150, each cooling channel 150 is uniformly distributed around the axis of the cooling nozzle 100, and the extension line of each cooling channel 150 is arranged at an acute angle with the axis of the cooling nozzle 100. By arranging several cooling channels 150 at an angle, not only can the extension length of the cooling channel 150 be extended to improve the cooling efficiency of the cooling nozzle 100, but also the cooling groove 140 can be arranged closer to the spraying side 110 to further improve the cooling efficiency of the cooling nozzle 100.

[0062] It can be understood that since each cooling channel 150 is uniformly distributed around the axis of the cooling nozzle 100, the uniformity of the cooling and cooling of the cooling gas flow to each position of the cooling nozzle 100 can be ensured, so as to ensure the cooling and cooling effect.

[0063] Further, the cooling channel 150 is provided with 9-13, and specifically, the cooling channel 150 can be selected as 9, 10, 11, 12 or 13. Further, the inner diameter size of the cooling channel 150 is not less than 2.0 mm, and specifically, the inner diameter size of the cooling channel 150 can be selected as 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm or other numerical size. By such setting, the cooling effect of the cooling channel 150 passing through the cooling nozzle 100 can be guaranteed. Of course, in other embodiments, the cooling channel 150 can also be provided with 8, 14, 15 or other quantities, and the setting quantity of the cooling channel 150 can be adjusted according to the size and model of the cooling nozzle 100.

[0064] In an embodiment, referring to Figure 1 , Figure 4 and Figure 5 , the laser processing head further comprises a support body 200, the mounting side 120 is detachably connected to the end of the support body 200 close to the cooling nozzle 100, and has a cooling gap 300 between the end of the support body 200 close to the cooling nozzle 100, and the end of the support body 200 close to the cooling nozzle 100 is provided with a blowing hole 210; the blowing hole 210 is used for blowing the cooling gas flow to the mounting side 120, part of the cooling gas flow is discharged under the guidance of the cooling gap 300, and the other part of the cooling gas flow is transmitted to the cooling groove 140 through the cooling channel 150 and discharged under the guidance of the cooling groove 140. Specifically, the mounting side 120 is threadedly connected to the support body 200, and of course, the mounting side 120 can also be snap-connected to the support body 200, and the specific connection mode of the mounting side 120 and the support body 200 can be adjusted according to the installation demand.

[0065] It can be understood that the blowing hole 210 blows the cooling gas flow to the mounting side 120, part of the cooling gas flow is discharged under the guidance of the cooling gap 300, thereby realizing the first layer nozzle cooling, and the other part of the cooling gas flow is transmitted to the cooling groove 140 through the cooling channel 150 and discharged under the guidance of the cooling groove 140, thereby realizing the second layer nozzle cooling, and through the double-layer nozzle cooling, the cooling effect of the cooling nozzle 100 can be improved, and the service life of the nozzle can be prolonged.

[0066] In an embodiment, referring to Figure 5 and Figure 7 , an annular groove 122 is formed on the mounting side 120, and the groove wall of the annular groove 122 and the support body 200 form the cooling gap 300, and the cooling gas flow can realize the cooling of the mounting side 120 of the cooling nozzle 100 in the process of flowing out through the cooling gap 300, thereby realizing the first layer nozzle cooling. Specifically, the support body 200 is a wind-cooled ceramic ring.

[0067] In an embodiment, please refer to Figure 4 、 Figure 6 and Figure 7 , the cooling channel 140 is an annular channel, the cooling channel 140 comprises an inner edge portion 145 close to the axis of the cooling nozzle 100, an opening portion 146 opened on the outer wall of the body portion 130, and an extension section 147 connecting the inner edge portion 145 and the opening portion 146, so that the cooling gas flow can be discharged from the inner edge portion 145 to the opening portion 146, ensuring the cooling area of the cooling gas flow to the nozzle.

[0068] Compared with the prior art, the cooling gas flow only cools the mounting side 120 of the cooling scheme, and the cooling nozzle 100 of the present embodiment is additionally provided with a cooling channel 140, which increases the cooling effect of the cooling gas flow on the cooling nozzle 100, so that the temperature can be reduced by more than 10℃ on the basis of the existing cooling scheme, so as to solve the problem of easy overheating and burning of the cooling nozzle 100.

[0069] In the present embodiment, the groove wall of the cooling channel 140 away from the second circular cone section 132 forms a second surface 148, and the extension section 147 is an extension channel enclosed by the first surface 141 and the second surface 148. During the flow of the cooling gas flow through the extension section 147, the cooling gas flow can cool and reduce the temperature of the first surface 141 and the second surface 148, thereby increasing the cooling effect of the cooling nozzle 100.

[0070] Further, the first surface 141 is an annular plane, and the first plane where the first surface 141 is located is perpendicular to the axis of the cooling nozzle 100. At this time, the extension direction of the extension section 147 is perpendicular to the axis direction of the cooling nozzle 100, so that the cooling gas flow is discharged along the direction perpendicular to the axis of the cooling nozzle 100, and the processing is simple and the cost is low.

[0071] Alternatively, please refer to Figure 12 , the first surface 141 is a conical surface, the first surface 141 extends obliquely from the inner edge portion 145 to the direction away from the inner edge portion 145 and the jet side 110, and the line profile formed by the first surface 141 relative to the cross section of the axis of the cooling nozzle 100 is arranged at an angle γ with the plane perpendicular to the axis of the cooling nozzle 100, 0 < γ ≤ 30°. By such arrangement, the guide section 144 on the first surface 141 is more conducive to guiding the cooling gas flow to flow along the outer wall of the first circular cone section 131, so as to improve the cooling effect of the cooling nozzle 100 and avoid the airflow interference of the cooling gas flow to the jet side 110.

[0072] Of course, in other embodiments, the cooling groove 140 is also provided with a plurality of cooling grooves 140, each cooling groove 140 is arranged around the axis of the cooling nozzle 100 and is arranged one-to-one with each cooling channel 150, at this time, the first surface 141 of each cooling groove 140 can be arranged obliquely, thereby facilitating the guiding of the cooling airflow to flow along the outer wall of the first circular table segment 131.

[0073] In an embodiment, referring to Figures 4 to 6 , the cooling channel 150 extends from the air inlet hole 121 to the inner edge portion 145 of the cooling groove 140, so as to transmit the cooling airflow from the cooling gap 300 into the cooling groove 140, and increase the cooling area of the cooling airflow on the cooling nozzle 100 through the cooling groove 140, thereby improving the cooling effect of the cooling nozzle 100.

[0074] In an embodiment, the outer wall of the cooling nozzle 100 is provided with an anti-sticking heat-resistant coating, which is a Teflon coating, an aluminum oxide coating, a ceramic coating, or a diamond coating, etc. The Teflon coating has excellent high and low temperature resistance, corrosion resistance, wear resistance, and non-sticking properties. The anti-sticking heat-resistant coating can prevent the splashes from adhering to the outer wall of the cooling nozzle 100, reduce the thermal influence of the temperature of the splashes on the cooling nozzle 100, and the non-sticking effect of the anti-sticking heat-resistant coating can keep the surface of the cooling nozzle 100 clean, thereby prolonging the service life of the cooling nozzle 100.

[0075] In an embodiment, referring to Figure 4 and Figure 11 , the laser channel 160 includes an inlet end 161 and an outlet end 162, and a converging section 163, an accelerating section 164, and a launching section 165 sequentially communicated from the inlet end 161 to the outlet end 162, the inner diameter size of the converging section 163 gradually decreases from the inlet end 161 to the outlet end 162, the inner diameter size of the accelerating section 164 gradually decreases from the inlet end 161 to the outlet end 162, and the inner diameter size of the outlet of the accelerating section 164 is L1, the inner diameter size of the inlet of the accelerating section 164 is L2, L1+1.6mm≤L2≤L1+2.4mm.

[0076] Further, L2=L1+1.6mm, L2=L1+1.8mm, L2=L1+2.0mm, L2=L1+2.2mm, or L2=L1+2.4mm.

[0077] In the embodiment, the extension length of the accelerating section 164 in the axis direction of the cooling nozzle 100 is H1, the extension length of the launching section 165 in the axis direction of the cooling nozzle 100 is H2, and 0.9H1≤H2≤1.1H1. Further, H2=0.9H1, H2=1.0H1, or H2=1.1H1.

[0078] It can be understood that by configuring the cooling nozzle 100 size of the laser processing head and the parameters of the optical path system such as the laser head, the heat source of the laser beam can be controlled at the junction 166 of the acceleration section 164 and the emission section 165. In the laser channel 160, not only the laser beam exists, but also the cutting gas flow is filled, and the laser beam is coaxially arranged with the cutting gas flow. At this time, by setting the parameters of the acceleration section 164 and the emission section 165, the inner diameter size of the acceleration section 164 and the emission section 165 can be limited to be small, so as to ensure that the laser beam is closest to the wall surface of the cooling nozzle 100 at the position where the cutting gas flow is relatively narrow, the cutting gas flow speed is fast, and a large amount of heat can be taken away, thereby further enhancing the cooling and cooling effect of the cooling nozzle 100.

[0079] In an embodiment, when the first surface 141 is a plane, a first plane on which the first surface 141 is located is perpendicular to the axis of the cooling nozzle 100, a second plane on which the cross section at the inlet of the acceleration section 164 is located is perpendicular to the axis of the cooling nozzle 100, and the perpendicular distance between the first plane and the second plane is 0-2mm. Further, the perpendicular distance between the first plane and the second plane can be selected as 0, 0.4mm, 0.8mm, 1.2mm, 1.6mm or 2.0mm. By so arranging, the cooling channel 140 can be arranged close to the inlet of the acceleration section 164, thereby improving the cooling and cooling effect of the cooling nozzle 100.

[0080] In an embodiment, the height size of the cooling channel 140 on the straight line on which the axis of the cooling nozzle 100 is located is 1mm-3mm. Specifically, the height size of the cooling channel 140 on the straight line on which the axis of the cooling nozzle 100 is located can be selected as 1mm, 1.4mm, 1.8mm, 2.0mm, 2.4mm, 2.8mm or 3mm. It can be understood that the height size of the cooling channel 140 needs to be kept within a reasonable range. When the height size of the cooling channel 140 is too large, the flow rate of the cooling gas flow will decrease, which will affect the heat dissipation effect. When the height size of the cooling channel 140 is too small, the heat dissipation effect of the cooling gas flow will be insufficient.

[0081] Further, in the present embodiment, the distance between the cooling channel 140 and the nozzle port of the jet side 110 is 3.5mm-10.5mm. Specifically, the distance between the cooling channel 140 and the nozzle port of the jet side 110 can be selected as 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, 10mm or 10.5mm. It can be understood that the smaller the size of the cooling channel 140 relative to the jet side 110, the greater the influence of the cooling channel 140 on the heat dissipation of the cooling nozzle 100, and the better the heat dissipation performance of the cooling nozzle 100.

[0082] In summary, the cooling nozzle 100 and the laser processing head of the utility model have the intersection 142 between the outer wall extension line of the first circular truncated cone section 131 and the first surface 141, the intersection 142 separates the first surface 141 to form the transmission section 143 close to the center of the cooling nozzle 100 and the guide section 144 away from the center of the cooling nozzle 100, therefore, the cooling gas flows along the outer wall of the first circular truncated cone section 131 in the opposite direction by the air path simulation on the first surface 141, and carries away a large amount of heat, that is, when the cooling gas flows through the guide section 144, the guide section 144 can guide the cooling gas to flow along the outer wall of the first circular truncated cone section 131, and the cooling gas can carry away the heat of the first circular truncated cone section 131, so as to further improve the cooling effect of the cooling nozzle 100.

[0083] The above only discloses the preferred embodiments of the utility model, and of course cannot limit the scope of the utility model, so equivalent changes made according to the utility model claims still belong to the scope covered by the utility model.

Claims

1. A cooling nozzle characterized by, The cooling nozzle comprises a spraying side and a mounting side arranged oppositely, and a body part arranged between the spraying side and the mounting side, wherein a cooling groove is arranged on the outer peripheral wall of the body part, an air inlet hole is formed on the mounting side, and a cooling channel is arranged in the body part and connected with the cooling groove and the air inlet hole; The cooling groove separates the body part into a first circular table segment close to the mounting side and a second circular table segment close to the spraying side, a groove wall close to the second circular table segment forms a first surface, and an intersection between the outer wall extension line of the first circular table segment and the first surface separates the first surface into a transmission segment close to the center of the cooling nozzle and a guide segment away from the center of the cooling nozzle.

2. Cooling nozzle according to claim 1, characterized in that The cooling nozzle is provided with a laser channel penetrating through the spraying side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle; An angle between the outer wall extension line of the first circular table segment and the axis of the cooling nozzle is α, and an angle between the outer wall extension line of the second circular table segment and the axis of the cooling nozzle is β, wherein β is greater than α.

3. The cooling nozzle of claim 2, wherein, β is less than 45°; and / or The cooling nozzle is a bevel nozzle.

4. The cooling nozzle of claim 1, wherein, The cooling nozzle is provided with a laser channel penetrating through the spraying side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle; The cooling channel is provided with a plurality of cooling channels, each of which is uniformly distributed around the axis of the cooling nozzle, and the extension line of each of the cooling channels is arranged at an acute angle with the axis of the cooling nozzle.

5. The cooling nozzle of claim 1, wherein, The cooling nozzle is provided with a laser channel penetrating through the spraying side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle; The cooling groove is an annular groove, which comprises an inner edge part close to the axis of the cooling nozzle, an opening part arranged on the outer peripheral wall of the body part, and an extension segment connecting the inner edge part and the opening part; The groove wall away from the second circular table segment forms a second surface, and the extension segment is an extension channel enclosed by the first surface and the second surface; The first surface is an annular plane, and a first plane where the first surface is located is perpendicular to the axis of the cooling nozzle; or the first surface is a conical surface, the first surface extends obliquely from the inner edge part to a direction away from the inner edge part and the spraying side, and a line profile formed by the first surface relative to the cross section of the axis of the cooling nozzle is arranged at an angle γ with a plane perpendicular to the axis of the cooling nozzle, wherein 0<γ≤30°.

6. The cooling nozzle of claim 5, wherein, The inner diameter of the cooling channel is not less than 2.0 mm; and / or The cooling channel extends from the air inlet hole to the inner edge part of the cooling groove.

7. The cooling nozzle of claim 1, wherein, The cooling nozzle is provided with a laser channel penetrating through the spraying side and the mounting side, and a center line of the laser channel forms an axis of the cooling nozzle; The laser channel comprises an inlet end and an outlet end, and a converging section, an accelerating section and a launching section in sequence from the inlet end to the outlet end, the inner diameter of the converging section gradually decreases from the inlet end to the outlet end, the inner diameter of the accelerating section gradually decreases from the inlet end to the outlet end, and the inner diameter of the accelerating section at the outlet end is L1, the inner diameter of the accelerating section at the inlet end is L2, L1+1.6mm≤L2≤L1+2.4mm; The extending length of the accelerating section in the axial direction of the cooling nozzle is H1, the extending length of the launching section in the axial direction of the cooling nozzle is H2, 0.9H1≤H2≤1.1H1.

8. The cooling nozzle of claim 1, wherein, The height of the cooling channel in the straight line where the axial line of the cooling nozzle is located is 1.0mm-3.0mm; and / or, The distance between the cooling channel and the nozzle port of the spraying side is 3.5mm-10.5mm.

9. A laser machining head, characterized by, The laser processing head comprises a support body and the cooling nozzle according to any one of claims 1 to 8; The mounting side is detachably connected to the end of the support body close to the cooling nozzle, and has a cooling gap between the end of the support body close to the cooling nozzle; the end of the support body close to the cooling nozzle is provided with a blowing hole; The blowing hole is used for blowing a cooling gas flow to the mounting side, part of the cooling gas flow is discharged under the guidance of the cooling gap, and the other part of the cooling gas flow is transmitted to the cooling channel and discharged under the guidance of the cooling channel.

10. The laser machining head of claim 9, wherein, An annular groove is formed on the mounting side, and the groove wall of the annular groove and the support body form the cooling gap; and / or, The support body is a wind-cooled ceramic ring.

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