Cooling structure and laser processing head

Abstract

The utility model discloses a cooling structural body and a laser processing head, the cooling structural body comprises a liquid cooling module and a nozzle, a laser channel for laser to axially pass through is arranged in the liquid cooling module, and the nozzle is attached to the end part of the liquid cooling module; the liquid cooling module is provided with a liquid cooling cavity, a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are communicated with the liquid cooling cavity, the liquid cooling cavity comprises a first liquid channel communicated with the liquid inlet hole, a first transfer channel communicated with the first liquid channel and a liquid inlet channel communicated with the first transfer channel, and the liquid inlet channel is communicated with the first transfer channel at the communication position of the first transfer channel and the liquid inlet channel. The radial section of the first transfer channel is eccentrically arranged relative to the radial section of the liquid inlet channel. Through the arrangement of the eccentric water channel structure, water flow forms vortexes, turbulence is increased, and enhanced heat transfer is formed in the flow channel, so that heat at the nozzle can quickly enter the water flow and then is quickly taken away by the water flow, the cooling efficiency of the nozzle is improved, and the nozzle is prevented from being overheated and burnt.

Description

Technical Field

[0001] The utility model relates to the technical field of laser processing, in particular to a cooling structure and a laser processing head. Background Art

[0002] With the continuous advancement of the manufacturing industry and the growing demand, high-power laser cutting technology has become an important tool in the field of industrial processing. Especially in the past few years, the emergence of high-power lasers exceeding 50kw has greatly improved cutting efficiency and processing capabilities, making it possible to process thicker materials and more efficient cutting. In the high-power laser cutting process, temperature management of the cutting head is a key factor in ensuring precise cutting and extending the life of the equipment. In particular, the nozzle part will rapidly increase its temperature due to continuous exposure to high-energy lasers. If it cannot be effectively controlled, excessively high temperatures will cause thermal deformation of the nozzle material, affect the cutting quality, and even damage the cutting head, increasing maintenance costs and downtime. In the prior art, coolant or cooling gas is used to cool the nozzle, but the cooling effect is poor. Utility Model Content

[0003] The utility model aims to provide a cooling structure and a laser processing head, aiming to solve the problem that in the existing laser processing head, cooling liquid or cooling gas is used to cool the nozzle, but the cooling effect is not good.

[0004] In a first aspect, the utility model provides a cooling structure, the cooling structure comprising a liquid cooling module and a nozzle, the liquid cooling module is provided with a laser channel for the laser to pass axially, and the nozzle is attached to the end of the liquid cooling module;

[0005] The liquid cooling module is provided with a liquid cooling cavity, and a liquid inlet hole and a liquid outlet hole connected to the liquid cooling cavity. The liquid cooling cavity includes a first liquid channel connected to the liquid inlet hole, a first transfer channel connected to the first liquid channel, and a liquid inlet channel connected to the first transfer channel. At the connection between the first transfer channel and the liquid inlet channel, a radial cross-section of the first transfer channel is eccentrically arranged relative to a radial cross-section of the liquid inlet channel.

[0006] In one embodiment, the liquid cooling module includes a main body and a protruding portion, the main body includes a first side and a second side arranged opposite to each other, the protruding portion is a protruding structure extending from the second side along the laser emitting direction, and the nozzle is attached to the end of the protruding portion away from the main body.

[0007] In one of the embodiments, the liquid cooling cavity includes an annular cavity formed at the end of the protrusion away from the main body, the first liquid channel formed in the main body and connected to the liquid inlet, the first transfer channel formed in the main body and connected to the first liquid channel, the second liquid channel formed in the main body and connected to the liquid outlet, the second transfer channel formed in the main body and connected to the second liquid channel, a liquid inlet channel connecting the annular cavity and the first transfer channel, and a liquid outlet channel connecting the annular cavity and the second transfer channel.

[0008] In one embodiment, at the connection point between the second transfer channel and the liquid outlet channel, the radial cross section of the second transfer channel is eccentrically arranged relative to the radial cross section of the liquid outlet channel; and / or,

[0009] There are multiple first transfer channels, multiple liquid inlet channels, and they are arranged one-to-one corresponding to each of the first transfer channels; there are multiple second transfer channels, multiple liquid outlet channels, and they are arranged one-to-one corresponding to each of the second transfer channels.

[0010] In one embodiment, the orthographic projection of the radial cross section of the liquid inlet channel relative to the horizontal plane is a first projection area, the orthographic projection of the radial cross section of the first liquid channel and the first transfer channel relative to the horizontal plane is a second projection area, the first projection area is located within the second projection area, and there is a gap between the edge of the first projection area and the edge of the second projection area; and / or,

[0011] The orthographic projection of the radial cross-section of the liquid outlet channel relative to the horizontal plane is the third projection area, and the orthographic projection of the radial cross-section of the second liquid channel and the second transfer channel relative to the horizontal plane is the fourth projection area. The third projection area is located within the fourth projection area, and there is a distance between the edge of the third projection area and the edge of the fourth projection area.

[0012] In one embodiment, the cooling structure further includes a shielding ring;

[0013] The shielding ring is arranged on the protruding portion and is enclosed with the outer wall of the protruding portion to form a gas channel, and the gas channel is used to blow air to the nozzle;

[0014] Alternatively, the shielding ring includes a first part arranged in a ring around the protrusion, and a second part connected to the first part and attached to the main body, the space enclosed by the second part and the outer wall of the protrusion is filled with a sealing structure, and an annular or semi-annular gas outlet hole is formed on the second part, and the gas outlet hole is used to blow air to the outer wall of the first part and the nozzle.

[0015] In one embodiment, the cooling structure further includes a first insulating plate and a grounding wire, the first insulating plate is attached to the second side, the shielding ring is attached to the first insulating plate and connected to the grounding wire, and a non-metallic coating is formed on the shielding ring; and / or,

[0016] The distance between the shielding ring and the nozzle is 0-40 mm.

[0017] In one embodiment, the liquid cooling module includes an inner ring body and an outer ring sleeve, the outer ring sleeve is arranged on the outer wall of the inner ring body, and is enclosed with the outer wall of the inner ring body to form the liquid cooling cavity, and the liquid cooling module is a metal structural part.

[0018] In the second aspect, the utility model also provides a laser processing head, which includes a laser head, a lens group mechanism and a cooling structure of any of the above embodiments, wherein the laser head is used to generate a laser beam, and the optical cavity of the lens group mechanism is connected to the laser channel of the liquid cooling module and the nozzle.

[0019] In one embodiment, the laser processing head further comprises a support shaft and a second insulating plate, one end of the support shaft is connected to the lens assembly mechanism, and the other end is connected to the liquid cooling module through the second insulating plate; and / or,

[0020] The laser processing head also includes a support shaft, a fastening assembly, a detection assembly and a coaxial mechanism, one end of the support shaft is used to install the lens assembly mechanism, and the other end is used to install the liquid cooling module;

[0021] The coaxial mechanism can be installed between the lens group mechanism and the support shaft, and is used to limit the coaxiality of the support shaft relative to the optical cavity of the lens group mechanism. The fastening component can detachably connect the support shaft and the lens group mechanism. The fastening component is provided with a breaking structure. When the external force applied to the support shaft reaches a preset value, the breaking structure can break to separate the support shaft from the lens group mechanism. The detection component is installed on the lens group mechanism, and is used to sense the separation state of the support shaft relative to the lens group mechanism.

[0022] The following beneficial effects are achieved by using the embodiments of the present invention:

[0023] By adopting the cooling structure of the utility model, the nozzle is attached to the end of the liquid cooling module, and the nozzle is directly connected to the liquid cooling module, which can ensure that the liquid cooling module has a high cooling efficiency for the nozzle. Furthermore, at the connection between the first transfer channel and the liquid inlet channel, the radial cross-section of the first transfer channel is eccentrically arranged relative to the radial cross-section of the liquid inlet channel. Through the eccentric water channel structure, the water flow forms a vortex in the flow channel, increasing turbulence and forming enhanced heat transfer, so that the heat at the nozzle can quickly enter the water flow and then be quickly carried away by the water flow, thereby further improving the cooling efficiency of the nozzle, ensuring the cooling effect of the nozzle, and avoiding overheating and burning of the nozzle.

[0024] The above-mentioned cooling structure is applied to the laser processing head. Since the liquid module has a high cooling efficiency for the nozzle, it can avoid overheating and burning of the nozzle and increase the service life of the nozzle. Since there is no need to frequently replace the burned nozzle, the time and cost of nozzle replacement can be saved, thereby improving the stability and reliability of the laser processing head. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] in:

[0027] Figure 1 FIG. 4 is a schematic diagram of a cooling structure in one embodiment.

[0028] Figure 2 for Figure 1 A partial cross-sectional view of the cooling structure shown.

[0029] Figure 3 for Figure 1 A cross-sectional view of the cooling structure shown.

[0030] Figure 4 FIG. 4 is a schematic diagram of a cooling structure in another embodiment.

[0031] Figure 5 FIG. 4 is a cross-sectional view of a cooling structure in another embodiment.

[0032] Figure 6 Schematic diagram of a laser processing head in one embodiment.

[0033] Figure 7 for Figure 1 A cross-sectional view of a fastener in a laser processing head is shown.

[0034] Reference numerals: 100, liquid cooling module; 110, laser channel; 120, liquid cooling cavity; 121, first liquid channel; 122, first transfer channel; 123, liquid inlet channel; 124, annular cavity; 125, liquid outlet channel; 126, second transfer channel; 127, second liquid channel; 130, liquid inlet hole; 140, liquid outlet hole; 150, main body; 151, first side; 152, second side; 153, first mounting hole; 154, second mounting hole; 155, air hole; 156, weight reduction hole; 160, protrusion; 170, inner ring body; 180, outer ring sleeve; 200, nozzle; 300, shielding ring; 310, first part; 320, second part; 301, gas channel; 302, gas outlet; 303, blocking structure; 304, coating; 400, first insulating plate; 500, support shaft; 510, second positioning hole; 520, second connecting hole; 600, fastening assembly; 610, fastener; 611, head; 612, rod body; 613, fracture structure; 6131, fracture groove; 710, positioning shaft; 800, sealing plug. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] The utility model discloses a laser processing head, which can perform laser processing such as laser cutting and laser welding on a workpiece. Figures 1 to 3 A laser processing head of an embodiment includes a laser head, a lens group mechanism and a cooling structure. The laser head is used to generate a laser beam. The cooling structure includes a liquid cooling module 100 and a nozzle 200. The liquid cooling module 100 is provided with a laser channel 110 for the laser to pass axially. The nozzle 200 is attached to the end of the liquid cooling module 100. The optical cavity of the lens group mechanism is connected with the laser channel 110 and the nozzle 200 of the liquid cooling module 100. The laser beam is ejected from the nozzle 200, so that the workpiece can be laser cut or laser welded by the laser beam. Since the nozzle 200 is directly connected to the liquid cooling module 100, the cooling efficiency of the liquid cooling module 100 to the nozzle 200 can be ensured to be high.

[0039] In one embodiment, see Figures 1 to 3 The liquid cooling module 100 is provided with a liquid cooling cavity 120, and a liquid inlet hole 130 and a liquid outlet hole 140 connected to the liquid cooling cavity 120. The liquid cooling cavity 120 includes a first liquid channel 121 connected to the liquid inlet hole 130, a first transfer channel 122 connected to the first liquid channel 121, and a liquid inlet channel 123 connected to the first transfer channel 122. At the connection between the first transfer channel 122 and the liquid inlet channel 123, the radial cross-section of the first transfer channel 122 is eccentrically arranged relative to the radial cross-section of the liquid inlet channel 123.

[0040] It can be understood that, through the eccentric water channel structure setting, the water flow forms a vortex in the flow channel, increasing turbulence and forming enhanced heat transfer, so that the heat at the nozzle 200 can quickly enter the water flow and then be quickly carried away by the water flow, thereby further improving the cooling efficiency of the nozzle 200, ensuring the cooling effect of the nozzle 200, and avoiding overheating and burning of the nozzle 200.

[0041] In addition, since the liquid module has a high cooling efficiency for the nozzle 200, it can prevent the nozzle 200 from overheating and burning, thereby increasing the service life of the nozzle 200. Since there is no need to frequently replace the burned nozzle 200, the replacement time and cost of the nozzle 200 can be saved, thereby improving the stability and reliability of the laser processing head.

[0042] When the laser processing head is applied to a laser cutting machine, the laser processing head is a laser cutting head. The laser processing head scheme of this embodiment is set to improve the cutting performance of the laser cutting head during the cutting process.

[0043] In one embodiment, see Figures 1 to 3The liquid cooling module 100 includes a main body 150 and a protruding portion 160. The main body 150 includes a first side 151 and a second side 152 that are arranged opposite to each other. The protruding portion 160 is a protruding structure extending from the second side 152 along the laser emission direction. The nozzle 200 is attached to the end of the protruding portion 160 away from the main body 150, so that the nozzle 200 can be directly cooled by the protruding portion 160. Since there are no other spaced assembly parts between the protruding portion 160 and the nozzle 200, this direct-fit installation method can ensure that the liquid cooling module 100 has a high cooling efficiency for the nozzle 200.

[0044] Specifically, the main body 150 is a disc-shaped structure, and the protruding portion 160 is a cylindrical structure. By such an arrangement, the shape of the main body 150 can match the supporting module, and the shape of the protruding portion 160 can match the nozzle 200 .

[0045] In one embodiment, see Figures 1 to 3 The liquid cooling cavity 120 includes an annular cavity 124 formed at an end of the protrusion 160 away from the main body 150, a first liquid channel 121 formed in the main body 150 and connected to the liquid inlet hole 130, a first transfer channel 122 formed in the main body 150 and connected to the first liquid channel 121, a second liquid channel 127 formed in the main body 150 and connected to the liquid outlet hole 140, a second transfer channel 126 formed in the main body 150 and connected to the second liquid channel 127, a liquid inlet channel 123 connecting the annular cavity 124 and the first transfer channel 122, and a liquid outlet channel 125 connecting the annular cavity 124 and the second transfer channel 126. Since the coolant circulates in the annular cavity 124, it can ensure that the end of the protrusion 160 away from the main body 150 is in a low temperature state, which facilitates heat transfer between the protrusion 160 and the nozzle 200, thereby improving the cooling efficiency of the liquid cooling module 100 on the nozzle 200.

[0046] Specifically, the liquid inlet hole 130 and the liquid outlet hole 140 are both opened in the main body 150, and the liquid cooling module 100 also includes a liquid inlet joint and a liquid outlet joint. The liquid inlet joint is detachably connected to the hole wall of the liquid inlet hole 130, and the liquid outlet joint is detachably connected to the hole wall of the liquid outlet hole 140. The coolant can enter the first liquid channel 121 from the liquid inlet joint, and flow through the first transfer channel 122, the liquid inlet channel 123, the annular cavity 124, the liquid outlet channel 125, the second transfer channel 126 and the second liquid channel 127 in sequence, and finally leave through the liquid outlet joint.

[0047] In one embodiment, see Figures 1 to 3At the connection point between the second transfer channel 126 and the liquid outlet channel 125, the radial section of the second transfer channel 126 is eccentrically arranged relative to the radial section of the liquid outlet channel 125. The eccentric water channel structure is arranged so that the water flow forms a vortex in the flow channel, increases turbulence, and forms enhanced heat transfer, so that the heat at the nozzle 200 can quickly enter the water flow and then be quickly taken away by the water flow, thereby further improving the cooling efficiency of the nozzle 200, ensuring the cooling effect of the nozzle 200, and avoiding overheating and burning of the nozzle 200. Within a temperature rise of 35 degrees, the heat dissipation power of the nozzle 200 is 300W-400W.

[0048] Furthermore, in this embodiment, the orthographic projection of the radial cross section of the liquid inlet channel 123 relative to the horizontal plane is the first projection area, and the orthographic projection of the radial cross section of the first liquid channel 121 and the first transfer channel 122 relative to the horizontal plane is the second projection area. The first projection area is located in the second projection area, and there is a gap between the edge of the first projection area and the edge of the second projection area, so that the liquid can form a vortex when flowing through the connection between the first transfer channel 122 and the liquid inlet channel 123, thereby increasing turbulence and enhancing heat transfer.

[0049] Similarly, the orthographic projection of the radial cross section of the liquid outlet channel 125 relative to the horizontal plane is the third projection area, and the orthographic projection of the radial cross section of the second liquid channel 127 and the second transfer channel 126 relative to the horizontal plane is the fourth projection area. The third projection area is located within the fourth projection area, and there is a gap between the edge of the third projection area and the edge of the fourth projection area, so that the liquid can form a vortex when flowing through the connection between the second transfer channel 126 and the liquid outlet channel 125, thereby increasing turbulence and enhancing heat transfer.

[0050] Of course, in other embodiments, a portion of the first projection area may be located within the second projection area, and another portion may be located outside the second projection area. In this case, it is also possible for the liquid to form a vortex when flowing through the connection between the first transfer channel 122 and the liquid inlet channel 123, thereby increasing turbulence and enhancing heat transfer. Similarly, a portion of the third projection area may be located within the fourth projection area, and another portion may be located outside the fourth projection area. In this case, it is also possible for the liquid to form a vortex when flowing through the connection between the second transfer channel 126 and the liquid outlet channel 125, thereby increasing turbulence and enhancing heat transfer.

[0051] In one embodiment, see Figures 1 to 3There are multiple first transfer channels 122, multiple liquid inlet channels 123, and they are arranged one-to-one with each first transfer channel 122, multiple second transfer channels 126, and multiple liquid outlet channels 125, and they are arranged one-to-one with each second transfer channel 126. The arrangement of multiple water channels reduces the resistance to liquid flow, and allows the entire flow to operate when any one or two liquid inlet channels 123 or liquid outlet channels 125 are blocked, thereby ensuring reliability in operation.

[0052] Further, the number of first transfer channels 122 is 3-5, the number of liquid inlet channels 123 is 3-5, and they are arranged one-to-one with each first transfer channel 122, the number of second transfer channels 126 is 3-5, and the number of liquid outlet channels 125 is 3-5, and they are arranged one-to-one with each second transfer channel 126. Specifically, the number of first transfer channels 122 can be 3, 4 or 5, the number of liquid inlet channels 123 can be 3, 4 or 5, the number of second transfer channels 126 can be 3, 4 or 5, and the number of liquid outlet channels 125 can be 3, 4 or 5.

[0053] In one embodiment, see Figures 1 to 3 The cooling structure also includes a shielding ring 300, which is arranged on the protrusion 160 and is enclosed with the outer wall of the protrusion 160 to form a gas channel 301. The gas channel 301 is used to blow air to the nozzle 200 to form a clean gas environment near the nozzle 200. The splashes on the surface of the nozzle 200 can be blown off, thereby protecting the entire nozzle 200 from dust pollution in the harsh cutting environment, thereby extending the service life of the nozzle 200.

[0054] It is understandable that the cooling airflow provided by the gas channel 301 can not only be used to blow away the welding slag in this space and the welding slag near the nozzle 200 to prevent the welding slag from clogging and clean the nozzle 200, but also cool the liquid cooling module 100 and the nozzle 200, thereby further improving the cooling efficiency of the nozzle 200. In addition, a protective airflow is also connected to the inside of the laser channel 110, that is, from below the protective mirror in the mirror assembly mechanism.

[0055] In another embodiment, see Figure 4 and Figure 5 The shielding ring 300 includes a first part 310 arranged in a ring on the protrusion 160, and a second part 320 connected to the first part 310 and attached to the main body 150. The space enclosed by the second part 320 and the outer wall of the protrusion 160 is filled with a sealing structure 303. An annular or semi-annular gas outlet hole 302 is formed on the second part 320, and the gas outlet hole 302 blows air to the outer wall of the first part 310 and the nozzle 200.

[0056] By setting the gas outlet hole 302, not only can a clean gas environment be formed near the nozzle 200, the splashes on the surface of the nozzle 200 are blown off, and the entire nozzle 200 is protected, but also a clean gas environment can be formed near the outer wall of the first part 310 to protect the cleanliness of the first part 310. Furthermore, the blocking structure 303 is an insulator made of ceramic material. Of course, in other embodiments, a plurality of gas outlet holes 302 can be provided, and they are arranged around the protrusion 160.

[0057] In one embodiment, a non-metallic coating 304 is formed on the shielding ring 300, and the coating 304 is formed on the inner side and the outer side of the shielding ring 300. The non-metallic coating 304 is used to prevent slag adhesion and ensure that the shielding ring 300 can maintain a relatively low temperature, thereby ensuring the stability and reliability of the operation of the servo system.

[0058] In one embodiment, see Figures 1 to 3 The cooling structure further includes a first insulating plate 400 and a grounding wire. The first insulating plate 400 is attached to the second side 152 . The shielding ring 300 is attached to the first insulating plate 400 and connected to the grounding wire.

[0059] It is understandable that when the laser processing head is a laser cutting head, during cutting, the measurement of the follow-up height is obtained by measuring and calculating the capacitance of the nozzle 200 and the plate through the LC resonant circuit, and the measurement accuracy directly affects the height accuracy. When the liquid cooling module 100 is used for cooling, more metal area and the plate will undoubtedly be introduced to form a larger capacitance. This will greatly reduce the height accuracy of the follow-up. This is especially true for the accuracy when the nozzle 200 needs to be raised more than 3mm.

[0060] Since the shielding ring 300 is grounded in this embodiment, the electromagnetic field of the liquid cooling module 100 can be cut off and prevented from being directly projected onto the surface of the plate to form a stable capacitor, so that it does not participate in the follow-up test capacitor, thereby ensuring the stability and reliability of the follow-up system operation.

[0061] Further, in order to ensure the motion accuracy of the servo system, the spacing of the shielding ring 300 close to the nozzle 200 relative to the nozzle 200 is 0-40mm. Preferably, the spacing of the shielding ring 300 close to the nozzle 200 relative to the nozzle 200 is 0mm-30mm. Specifically, the spacing of the shielding ring 300 close to the nozzle 200 relative to the nozzle 200 can be 0mm, 10mm, 12mm, 15mm, 17mm, 20mm, 23mm, 25mm, 27mm, 30mm, 32mm, 35mm, 47mm or 40mm.

[0062] Therefore, the laser processing head of this embodiment can not only efficiently cool the nozzle 200, but also solve the influence of the motion performance of the follow-up system, thereby effectively managing and controlling the temperature of the nozzle 200 under the action of high-power laser, improving cutting accuracy and efficiency, extending the service life of the laser processing head, and reducing maintenance requirements.

[0063] In one embodiment, see Figures 1 to 3 The liquid cooling module 100 includes an inner ring body 170 and an outer ring sleeve 180. The outer ring sleeve 180 is sleeved on the outer wall of the inner ring body 170 and is enclosed with the outer wall of the inner ring body 170 to form a liquid cooling cavity 120. The liquid cooling module 100 is a metal structural part. The inner ring body 170 is welded and fixed to the outer ring sleeve 180. The metal has good thermal conductivity and is convenient for heat transfer with the nozzle 200, thereby cooling the nozzle 200.

[0064] Of course, in other embodiments, the liquid cooling module 100 may also include an upper annular component and a lower annular component. The upper annular component can be docked with the lower annular component to enclose a liquid cooling cavity 120, thereby realizing the setting of the liquid cooling cavity 120. However, it should be noted that a cooling channel for the circulation of coolant is injection molded at the end of the protrusion 160 away from the main body 150 to ensure the cooling efficiency of the nozzle 200.

[0065] In one embodiment, please refer to Figure 6 The laser processing head further includes a support shaft 500 and a second insulating plate, one end of the support shaft 500 is connected to the lens assembly mechanism, and the other end is connected to the liquid cooling module 100 through the second insulating plate, thereby insulating the support shaft 500 from the liquid cooling module 100. Further, the laser processing head further includes a plurality of mounting parts, each of which sequentially passes through the main body 150 and the second insulating plate, and is detachably connected to the support shaft 500, thereby insulating and separating the liquid cooling module 100 from the support shaft 500 through the second insulating plate. Specifically, the first insulating plate 400 and the second insulating plate are both non-metallic isolation plates.

[0066] It is understandable that existing laser processing heads usually use ceramic rings to insulate the liquid cooling module 100 from the support shaft 500, but the positioning and installation of the ceramic rings on the support shaft 500 is difficult, resulting in insufficient coaxiality between the nozzle 200 and the support shaft 500 after installation, which can easily cause high-temperature laser burning of the nozzle 200.

[0067] Since the ceramic ring is replaced by the second insulating plate in this embodiment, the second insulating plate is smaller in size than the ceramic ring and has lower installation requirements, which facilitates the improvement of the coaxiality of the liquid cooling module 100 after being assembled to the support shaft 500, thereby reducing the cost by about 20%. Since the nozzle 200 is directly connected to the liquid cooling module 100, it is also convenient to ensure the coaxiality between the support shaft 500, the liquid cooling module 100 and the nozzle 200 after assembly, thereby better solving the problem of burning of the nozzle 200.

[0068] Specifically, the main body 150 is also provided with a first mounting hole 153 adapted to the mounting member, a second mounting hole 154 for mounting and fixing the shielding ring 300, an air hole 155 for introducing protective gas into the gas channel 301, and a weight reduction hole 156 for weight reduction.

[0069] In one embodiment, please refer to Figure 7 The laser processing head also includes a support shaft 500, a fastening assembly 600, a detection assembly and a coaxial mechanism. One end of the support shaft 500 is used to install the lens group mechanism, and the other end is used to install the liquid cooling module 100; the coaxial mechanism can be installed between the lens group mechanism and the support shaft 500, and is used to limit the support shaft 500 to be coaxial with the optical cavity of the lens group mechanism. The fastening assembly 600 can detachably connect the support shaft 500 and the lens group mechanism. The fastening assembly 600 is provided with a breaking structure 613. When the external force applied to the support shaft 500 reaches a preset value, the breaking structure 613 can break to separate the support shaft 500 from the lens group mechanism. The detection assembly is installed on the lens group mechanism, and is used to sense the separation and connection state of the support shaft 500 relative to the lens group mechanism.

[0070] In this embodiment, the strength of the fracture structure 613 is the weakest. When the external force applied to the support shaft 500 reaches a preset value, the fracture structure 613 will be broken into two parts.

[0071] It can be understood that when the laser processing head collides with the machine, the fracture structure 613 can break to separate the support shaft 500 from the lens group mechanism, the detection component senses that the support shaft 500 is in a separated state relative to the lens group mechanism, the detection component controls the system to shut down, the laser head stops generating the laser beam, and the laser processing head stops moving, thereby protecting the laser processing head and related equipment from excessive damage caused by the collision, protecting optical components such as the optical lens in the laser processing head from damage, and protecting the moving device that drives the laser processing head to move from damage.

[0072] After the collision, when the support shaft 500 is reassembled in the mirror assembly mechanism, the coaxial mechanism can limit the coaxiality of the support shaft 500 relative to the optical cavity of the mirror assembly mechanism, improve the coaxiality of the support shaft 500 assembled on the mirror assembly mechanism, thereby eliminating the assembly error, making the cutting gas path and the optical path concentric, and improving the processing capability of the laser processing head. The detection component senses that the support shaft 500 is in a connected state relative to the mirror assembly mechanism, and the system can perform laser processing, ensuring the light output quality and laser processing effect of the laser processing head.

[0073] In one embodiment, the coaxial mechanism includes a plurality of positioning shafts 710, a first positioning hole is provided at the end of the lens assembly mechanism, a second positioning hole 510 is provided on the support shaft 500, the positioning shaft 710 can pass through the second positioning hole 510, and be positioned and matched with the hole wall of the first positioning hole and the hole wall of the second positioning hole 510, so as to coaxially set the support shaft 500 relative to the optical cavity of the lens assembly mechanism, with a simple structure and convenient coaxial adjustment.

[0074] Furthermore, a plurality of first positioning holes and second positioning holes 510 are provided, and each is arranged in one-to-one correspondence with each positioning shaft 710, thereby further improving the accuracy of the coaxial arrangement of the support shaft 500 relative to the optical cavity of the lens assembly mechanism. Specifically, two positioning shafts 710 can be selected, and are symmetrically arranged on both sides of the axis of the support shaft 500. Of course, in other embodiments, three or more positioning shafts 710 can also be selected.

[0075] In one embodiment, the anti-collision device also includes a sealing plug 800, and the positioning shaft 710 can also be pulled out from the first positioning hole and the second positioning hole 510, that is, after the positioning shaft 710 completes the coaxial positioning of the support shaft 500 relative to the optical cavity of the lens group mechanism, the positioning shaft 710 is removed. Since the strength of the positioning shaft 710 is relatively high, after the positioning shaft 710 is installed in the first positioning hole and the second positioning hole 510, it will affect the separation condition of the support shaft 500 and the lens group mechanism. After the laser processing head collides with the machine, the fracture structure 613 cannot be fractured under the expected conditions, thereby causing the support shaft 500 and the lens group mechanism to fail to be separated in time, causing relatively serious damage to the laser processing head.

[0076] In one embodiment, the fastening assembly 600 includes a plurality of fasteners 610, each fastener 610 is disposed around the axis of the support shaft 500, each fastener 610 penetrates the support shaft 500, and is detachably connected to the lens assembly mechanism, thereby firmly mounting the support shaft 500 on the lens assembly mechanism. Each fastener 610 is provided with a breaking structure 613, and when the laser processing head crashes, the breaking structure 613 can break, thereby causing each fastener 610 to break into two parts, and the support shaft 500 is loosened and separated from the lens assembly mechanism.

[0077] Specifically, the fastener 610 includes a head 611 and a rod 612, and a fracture structure 613 connecting the head 611 and the rod 612. The outer wall of the rod 612 is formed with a threaded structure, and a fracture groove 6131 is arranged around the fracture structure 613. The lens assembly mechanism is provided with a first connection hole, and the support shaft 500 is provided with a second connection hole 520. The rod 612 can pass through the second connection hole 520 and be threadedly connected with the hole wall of the first connection hole. When the laser processing head collides with the machine, the fracture structure 613 can be broken, so that each fastener 610 is broken into two parts, so that the rod 612 part is retained in the first connection hole, and the head 611 is retained in the second connection hole 520. The head 611 is provided with a hexagonal hole, so that it is convenient for the operator to use a wrench to tighten the fastener 610, and the operator can use pliers to remove the rod 612 from the first connection hole.

[0078] In this embodiment, the mechanical connection between the support shaft 500 and the lens assembly mechanism is achieved through the fastener 610, and the coaxial positioning of the support shaft 500 and the lens assembly mechanism is achieved through the positioning shaft 710. The structural setting is simple and reliable, and the manufacturing cost is low.

[0079] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A cooling structure, characterized in that: The cooling structure comprises a liquid cooling module and a nozzle, wherein a laser channel for the laser to pass axially is provided in the liquid cooling module, and the nozzle is attached to the end of the liquid cooling module; The liquid cooling module is provided with a liquid cooling cavity, and a liquid inlet hole and a liquid outlet hole connected to the liquid cooling cavity. The liquid cooling cavity includes a first liquid channel connected to the liquid inlet hole, a first transfer channel connected to the first liquid channel, and a liquid inlet channel connected to the first transfer channel. At the connection between the first transfer channel and the liquid inlet channel, a radial cross-section of the first transfer channel is eccentrically arranged relative to a radial cross-section of the liquid inlet channel.

2. The cooling structure according to claim 1, characterized in that: The liquid cooling module includes a main body and a protruding portion, the main body includes a first side and a second side arranged opposite to each other, the protruding portion is a protruding structure extending from the second side along the laser emitting direction, and the nozzle is attached to the end of the protruding portion away from the main body.

3. The cooling structure according to claim 2, characterized in that: The liquid-cooling cavity includes an annular cavity formed at an end portion of the protrusion away from the main body, the first liquid channel formed in the main body and connected to the liquid inlet, the first transfer channel formed in the main body and connected to the first liquid channel, a second liquid channel formed in the main body and connected to the liquid outlet, a second transfer channel formed in the main body and connected to the second liquid channel, a liquid inlet channel connecting the annular cavity and the first transfer channel, and a liquid outlet channel connecting the annular cavity and the second transfer channel.

4. The cooling structure according to claim 3, characterized in that: At the connection point between the second transfer channel and the liquid outlet channel, the radial cross section of the second transfer channel is eccentrically arranged relative to the radial cross section of the liquid outlet channel; and / or, There are multiple first transfer channels, multiple liquid inlet channels, and they are arranged one-to-one corresponding to each of the first transfer channels; there are multiple second transfer channels, multiple liquid outlet channels, and they are arranged one-to-one corresponding to each of the second transfer channels.

5. The cooling structure according to claim 3, characterized in that: The orthographic projection of the radial cross section of the liquid inlet channel relative to the horizontal plane is a first projection area, the orthographic projection of the radial cross section of the first liquid channel and the first transfer channel relative to the horizontal plane is a second projection area, the first projection area is located within the second projection area, and there is a gap between the edge of the first projection area and the edge of the second projection area; and / or, The orthographic projection of the radial cross-section of the liquid outlet channel relative to the horizontal plane is the third projection area, and the orthographic projection of the radial cross-section of the second liquid channel and the second transfer channel relative to the horizontal plane is the fourth projection area. The third projection area is located within the fourth projection area, and there is a distance between the edge of the third projection area and the edge of the fourth projection area.

6. The cooling structure according to claim 2, characterized in that: The cooling structure also includes a shielding ring; The shielding ring is arranged on the protruding portion and is enclosed with the outer wall of the protruding portion to form a gas channel, and the gas channel is used to blow air to the nozzle; Alternatively, the shielding ring includes a first part arranged in a ring around the protrusion, and a second part connected to the first part and attached to the main body, the space enclosed by the second part and the outer wall of the protrusion is filled with a sealing structure, and an annular or semi-annular gas outlet hole is formed on the second part, and the gas outlet hole is used to blow air to the outer wall of the first part and the nozzle.

7. The cooling structure according to claim 6, characterized in that: The cooling structure further comprises a first insulating plate and a grounding wire, wherein the first insulating plate is attached to the second side, the shielding ring is attached to the first insulating plate and connected to the grounding wire, and a non-metallic coating is formed on the shielding ring; and / or, The distance between the shielding ring and the nozzle is 0-40 mm.

8. The cooling structure according to claim 1, characterized in that: The liquid cooling module includes an inner ring body and an outer ring sleeve. The outer ring sleeve is sleeved on the outer wall of the inner ring body and encloses the outer wall of the inner ring body to form the liquid cooling cavity. The liquid cooling module is a metal structural part.

9. A laser processing head, characterized in that: The laser processing head comprises a laser head, a lens assembly mechanism and a cooling structure according to any one of claims 1 to 8, wherein the laser head is used to generate a laser beam, and the optical cavity of the lens assembly mechanism is connected to the laser channel of the liquid cooling module and the nozzle.

10. The laser processing head according to claim 9, characterized in that: The laser processing head further comprises a support shaft and a second insulating plate, one end of the support shaft is connected to the lens assembly mechanism, and the other end is connected to the liquid cooling module via the second insulating plate; and / or, The laser processing head also includes a support shaft, a fastening assembly, a detection assembly and a coaxial mechanism, one end of the support shaft is used to install the lens assembly mechanism, and the other end is used to install the liquid cooling module; The coaxial mechanism can be installed between the lens group mechanism and the support shaft, and is used to limit the coaxiality of the support shaft relative to the optical cavity of the lens group mechanism. The fastening component can detachably connect the support shaft and the lens group mechanism. The fastening component is provided with a breaking structure. When the external force applied to the support shaft reaches a preset value, the breaking structure can break to separate the support shaft from the lens group mechanism. The detection component is installed on the lens group mechanism, and is used to sense the separation state of the support shaft relative to the lens group mechanism.

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