Protective device for laser welding machine

Abstract

The utility model discloses a laser welding machine protection device which solves the technical problem that when an existing laser welding machine protection device is used, splashed welding slag is prone to rebounding to a reflecting mirror, and the service life of the reflecting mirror is shortened. The device comprises a laser tube, a reflecting mirror, a nozzle and a protection piece, the laser tube is provided with an opening for laser to penetrate out; the reflecting mirror is mounted in the laser tube; the nozzle is connected with the laser tube through a connecting plate, a plurality of air inlet holes communicated with an air source are formed in the connecting plate, and the air inlet holes are sequentially formed in the first direction; the two ends of the protection piece are connected to the laser tube and the nozzle respectively, the protection piece is provided with a protection groove, the protection piece and the connecting plate define a containing cavity communicating with the opening and the nozzle, the protection piece is provided with an air curtain hole communicating with the containing cavity, and the air curtain hole and the air inlet hole are oppositely arranged in the direction perpendicular to the first direction to form a protection air curtain covering the section of the containing cavity. According to the protection piece, welding slag can be prevented from rebounding to the reflecting mirror; compressed air can flow out smoothly through the air curtain holes, and normal work of the device is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of welding equipment, and specifically relates to a protective device for a laser welding machine. Background Technology

[0002] The TMEIC laser welding machine protection device is a crucial piece of equipment in cold rolling production lines, used for welding the strip head and tail to achieve continuous production. During welding, the strip is first flattened by the inlet and outlet clamps, then a portion of the strip head and tail is cut off by the welding machine's double-cutting shears. Then, under pre-set welding parameters, the laser beam heats the strip head and tail to achieve the welding of different steel coils. The welding machine mainly consists of inlet and outlet clamps, double-cutting shears, a welding carriage, and an optical path system. The optical path system incorporates three reflecting mirrors (M1, M2, and M3), which ultimately transmit the laser generated by the resonant cavity to the working end. The M3 focusing mirror at the end moves with the carriage to complete the transverse welding of the weld seam.

[0003] In existing technology, the nozzle top of the TMEIC laser welding machine's protective device is not sealed to the M3 reflector, leaving it open without any protective device. During welding, the reflector moves with the carriage, performing transverse welding on the ends of the strip steel positioned by the inlet and outlet clamps. When the laser is reflected onto the strip steel surface, a molten pool forms, reacting violently and splattering in all directions. Some of the slag splashes encounter the upper clamp surface and bounce off the side onto the M3 reflector. This slag is very detrimental to the Mo coating on the M3 reflector, severely affecting its lifespan. Furthermore, because the M3 focusing mirror is located at the very end of the laser pipeline, where the nitrogen concentration is weakest, the Mo coating on the reflector surface is easily oxidized. Consequently, among the three reflectors in the laser pipeline, the M3 reflector has the shortest lifespan and requires the most frequent replacement. Summary of the Invention

[0004] To address the technical problem that welding slag splashed during the use of current laser welding machine protection devices easily bounces back onto the reflector, reducing the lifespan of the reflector, this application provides a laser welding machine protection device.

[0005] This application provides a laser welding machine protection device, including a laser tube, a reflector, a nozzle, and a protective component;

[0006] The laser tube is provided with an opening for the laser to pass through;

[0007] The reflector is installed inside the laser tube;

[0008] The nozzle is connected to the laser tube via a connecting plate. The connecting plate is provided with a plurality of air inlets for communicating with a gas source. The plurality of air inlets are arranged sequentially along a first direction.

[0009] The protective component has its two ends connected to the laser tube and the nozzle, respectively. The protective component is provided with a protective groove for the laser to pass through. The protective component and the connecting plate together form a receiving cavity that communicates with the opening and the nozzle. The protective component is provided with an air curtain hole that communicates with the receiving cavity. The air curtain hole and the air inlet are arranged opposite to each other in a direction perpendicular to the first direction to form a protective air curtain covering the cross section of the receiving cavity.

[0010] In some embodiments, the protective element includes a first plate and a second plate, wherein there are two first plates arranged opposite each other along the first direction, and the second plate connects the two first plates, and the second plate has air curtain holes.

[0011] In some embodiments, the air curtain opening is rectangular and extends to the edge of the first plate.

[0012] In some embodiments, the laser tube is provided with a protective gas inlet for introducing laser protective gas, the protective gas inlet being connected to the cavity of the laser tube, and the protective component is provided with a vent hole, the height of which is higher than the air curtain hole and the air inlet.

[0013] In some embodiments, the protective member has vent holes on both of the first plates that are arranged opposite each other along the first direction.

[0014] In some embodiments, a plurality of vent holes are provided, and the plurality of vent holes are spaced apart along a connection direction perpendicular to the reflector and the nozzle;

[0015] Alternatively, multiple vent holes may be spaced apart along the connection direction between the reflector and the nozzle.

[0016] In some embodiments, a baffle is included, the baffle being adjacent to the opening, the baffle being connected to the protective member, and located within the receiving cavity.

[0017] In some embodiments, multiple baffles are provided, and the multiple baffles together form a connecting channel that connects the receiving cavity and the internal cavity of the laser welding machine protection device.

[0018] In some embodiments, the protective element and the connecting plate are bolted together.

[0019] In some embodiments, the nozzle includes a nozzle seat and a body connected together, and the protective member is bolted to the nozzle seat.

[0020] The laser welding machine protection device provided according to the embodiments of this application includes a laser tube, a reflector, a nozzle, and a protective component; the laser tube has an opening for the laser to pass through; the reflector is installed inside the laser tube; the nozzle is connected to the laser tube through a connecting plate, the connecting plate has multiple air inlets for communicating with a gas source, the multiple air inlets are arranged sequentially along a first direction; the protective component has its two ends connected to the laser tube and the nozzle respectively, the protective component has a protective groove for the laser to pass through, the protective component and the connecting plate together form a receiving cavity communicating with the opening and the nozzle, the protective component has an air curtain hole communicating with the receiving cavity, the air curtain hole and the air inlets are arranged opposite to each other along a direction perpendicular to the first direction to form a protective air curtain covering the cross section of the receiving cavity.

[0021] This application has at least the following beneficial effects:

[0022] (1) This application provides a protective component between the laser tube and the reflector to close the open section between the nozzle and the laser tube, so as to prevent the spattered welding slag from being bounced onto the reflector from the outside, thus protecting the reflector.

[0023] (2) This application has multiple air inlets on the connecting plate for communication with the gas source. The multiple air inlets are arranged sequentially along the first direction. The protective component has an air curtain hole that communicates with the receiving cavity. The air curtain hole and the air inlet are arranged opposite each other along the perpendicular direction to the first direction. The air inlet hole provided in this application is connected to the gas pipe and blows gas into the protective groove to form a protective air curtain covering the cross section of the receiving cavity. The welding slag that enters the reflector from the inside of the protective component is blown out through the air curtain hole, further preventing the welding slag from being bounced onto the reflector and protecting the reflector. The air curtain hole and the air inlet are arranged opposite each other along the perpendicular direction to the first direction. The direct alignment of the air curtain hole and the air inlet hole can ensure the gas blowing effect. The air curtain hole with a larger opening can allow the compressed air to flow out smoothly, preventing the compressed air and the fumes generated during welding from forming eddies in the protective component and entering the laser pipeline, and ensuring that the pressure in the protective component is lower than the pressure in the laser pipeline, ensuring that the device works normally. Attached Figure Description

[0024] Figure 1 A partial structural schematic diagram of the laser welding machine protection device in an embodiment of this application is shown.

[0025] Figure 2 It shows Figure 1 Assembly diagram of the protective components, connecting plate, and nozzle.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Laser tube;

[0028] 200. Reflector;

[0029] 210. Second reflecting mirror; 220. Third reflecting mirror;

[0030] 300. Nozzle;

[0031] 310. Nozzle seat; 320. Main body;

[0032] 400. Protective components;

[0033] 410. Air curtain opening; 420. Vent hole; 430. Baffle;

[0034] 500. Connecting plate;

[0035] 510. Air intake. Detailed Implementation

[0036] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] This application provides a laser welding machine protection device to protect the reflector and increase its service life.

[0038] Please see Figure 1 as well as Figure 2 The laser welding machine protection device provided in this application includes a laser tube 100, a reflector 200, a nozzle 300, and a protective component 400. The laser tube 100 has an opening for the laser to pass through. The reflector 200 is installed inside the laser tube 100. The nozzle 300 is connected to the laser tube 100 through a connecting plate 500. The connecting plate 500 has multiple air inlets 510 for communicating with a gas source, and the multiple air inlets 510 are arranged sequentially along a first direction. The protective component 400 has two ends connected to the laser tube 100 and the nozzle 300, respectively. The protective component 400 has a protective groove for the laser to pass through. The protective component 400 and the connecting plate 500 together form a receiving cavity communicating with the opening and the nozzle 300. The protective component 400 has an air curtain hole 410 communicating with the receiving cavity. The air curtain hole 410 and the air inlet 510 are arranged opposite each other along a direction perpendicular to the first direction to form a protective air curtain covering the cross section of the receiving cavity.

[0039] The laser welding machine protection device includes a first reflector, a second reflector 210 and a third reflector 220, with the second reflector 210 and the third reflector 220 located inside the laser tube 100. The laser tube 100 is provided with an inlet for the laser to enter and an outlet for the laser to exit. The laser reflected from the first reflector into the laser tube 100 passes through the second reflector 210 and the third reflector 220 in sequence and then passes through the nozzle 300.

[0040] The reflector 200 is triangular in shape and has a reflective surface for reflecting laser light, with the reflective surface set at an angle to the laser path.

[0041] Nozzle 300 is located near the third reflector 220. The top of nozzle 300 is connected to laser tube 100 via connecting plate 500. Nozzle 300 has a channel for laser to pass through.

[0042] The protective component 400 is a U-shaped groove, with its two ends connected to the laser tube 100 and the nozzle 300 respectively, to close the open section between the laser tube 100 and the nozzle 300. The protective component 400 is provided with an air curtain hole 410, which is located on the same horizontal plane as the air inlet hole 510 provided on the connecting plate 500.

[0043] In some embodiments, the protective member 400 includes a first plate and a second plate. There are two first plates arranged opposite each other along a first direction. The second plate connects the two first plates. The second plate has an air curtain hole 410 so that the air curtain hole 410 is directly opposite the air inlet 510, which facilitates the blowing out of the internal welding slag. In some embodiments, the first direction is a horizontal direction. In some embodiments, the first direction is perpendicular to the connection direction between the nozzle 300 and the laser tube 100.

[0044] In some embodiments, the air curtain hole 410 is rectangular and extends to the edge of the first plate to prevent compressed air and welding fumes from forming eddies in the protective member 400 and entering the laser tube 100. In some embodiments, the air curtain hole 410 is elongated elliptical.

[0045] In some embodiments, the laser tube 100 is provided with a protective gas inlet for introducing laser protective gas. The protective gas inlet is connected to the cavity of the laser tube 100. The protective component 400 is provided with a vent hole 420. The height of the vent hole 420 is higher than that of the air curtain hole 410 and the air inlet 510. The nitrogen venting in the laser welding machine protection device is changed from the conventional open venting method to venting through the vent hole 420, so as to increase the pressure inside the laser tube 100 and thus increase the positive pressure state in the laser tube 100, effectively preventing slag and dust from entering the laser tube 100. At the same time, it also increases the nitrogen environment concentration at the third reflector 220 at the end of the laser tube 100, delaying the oxidation of the Mo coating on its surface. In some embodiments, the vent hole 420 is smaller than the air curtain hole 410; in some embodiments, the protective gas is nitrogen.

[0046] In some embodiments, the protective member 400 has vent holes 420 on both first plates that are arranged opposite each other along a first direction perpendicular to the first direction, so as to further increase the venting effect.

[0047] In some embodiments, multiple vent holes 420 are provided, and the multiple vent holes 420 are spaced apart along the connection direction perpendicular to the third reflector 220 and the nozzle 300 to further increase the venting effect; in some embodiments, the multiple vent holes 420 are spaced apart along the horizontal direction; in some embodiments, the multiple vent holes 420 are spaced apart along the connection direction of the third reflector 220 and the nozzle 300; in some embodiments, the multiple vent holes 420 are spaced apart along the vertical direction.

[0048] In some embodiments, a baffle 430 is included. The baffle 430 is close to the opening, connected to the protective member 400, and located within the receiving cavity to further increase the pressure inside the laser tube 100 path, further increase the positive pressure state in the laser tube 100 path, and further prevent slag and dust from entering the laser tube 100 path. At the same time, it also increases the nitrogen environment concentration at the end of the laser tube 100 where the third reflector 220 is located, delaying the oxidation of the Mo coating on its surface. Simultaneously, the baffle 430 can block some residues that are not blown out by the air curtain to protect the third reflector 220. In some embodiments, the protective member 400 is connected to the baffle 430 at the end near the laser tube 100. In some embodiments, the baffle 430 is located between the vent hole 420 and the third reflector 220. In some embodiments, the baffle 430 is located between the air curtain hole 410 and the third reflector 220. In some embodiments, the baffle 430 is closer to the third reflector 220 than the vent hole 420 or the air curtain hole 410.

[0049] In some embodiments, multiple baffles 430 are provided, and the multiple baffles 430 together form a connecting channel connecting the receiving cavity and the internal cavity of the laser welding machine protection device. In some embodiments, the baffles 430 are triangular. In some embodiments, four baffles 430 are provided, two of which are connected to the first plate and the second plate, and the other two are connected to the first plate and the connecting plate 500.

[0050] In some embodiments, the protective member 400 and the connecting plate 500 are bolted together to fix the protective member 400 and the connecting plate 500 together, and the protective member 400 can move integrally with the connecting plate 500; in some embodiments, the protective member 400 and the connecting plate 500 are fixedly connected by pins.

[0051] In some embodiments, the nozzle 300 includes a nozzle seat 310 and a body 320 connected together, and a protective member 400 is bolted to the nozzle seat 310 to fix the protective member 400 and the nozzle seat 310 together. The protective member 400 can move integrally with the nozzle 300. In some embodiments, the protective member 400 and the nozzle seat 310 are connected by a fixing pin.

[0052] The protection process of the protective component 400 in the laser welding machine protection device of this application is described in detail below:

[0053] During the welding process of the laser welding machine protection device, the laser sequentially passes through the first reflector, the second reflector 210, and the third reflector 220 to reach the nozzle 300. The laser welding machine protection device performs transverse welding on the head and tail of the strip steel positioned by the inlet and outlet clamps. When the laser is reflected onto the surface of the strip steel, a molten pool is formed. The molten pool reacts violently and sputters in all directions. Some of the sputtered slag bounces off the surface of the upper clamp. The slag bounced off the outside is blocked by the protection component 400, and the slag inside the protection component 400 is blocked by the air curtain to prevent the slag from acting on the third reflector 220 and causing damage to the third reflector 220. At the same time, the setting of the protection component 400 increases the nitrogen concentration at the end of the laser welding machine protection device, further protecting the Mo coating on the surface of the third reflector 220 and increasing the life of the third reflector 220.

[0054] The laser welding machine protection device of this application has at least the following advantages:

[0055] (1) This application provides a protective component between the laser tube and the reflector to close the open section between the nozzle and the laser tube, so as to prevent the spattered welding slag from being bounced onto the reflector from the outside, thus protecting the reflector.

[0056] (2) This application has multiple air inlets on the connecting plate for communication with the gas source. The multiple air inlets are arranged sequentially along the first direction. The protective component has an air curtain hole that communicates with the receiving cavity. The air curtain hole and the air inlet are arranged opposite each other along the perpendicular direction to the first direction. The air inlet hole provided in this application is connected to the gas pipe and blows gas into the protective groove to form a protective air curtain covering the cross section of the receiving cavity. The welding slag that enters the reflector from the inside of the protective component is blown out through the air curtain hole, further preventing the welding slag from being bounced onto the reflector and protecting the reflector. The air curtain hole and the air inlet are arranged opposite each other along the perpendicular direction to the first direction. The direct alignment of the air curtain hole and the air inlet hole can ensure the gas blowing effect. The air curtain hole with a larger opening can allow the compressed air to flow out smoothly, preventing the compressed air and the fumes generated during welding from forming eddies in the protective component and entering the laser pipeline, and ensuring that the pressure in the protective component is lower than the pressure in the laser pipeline, ensuring that the device works normally.

[0057] (3) The laser tube of this application is provided with a protective gas inlet for introducing laser protective gas. The protective gas inlet is connected to the cavity of the laser tube. The protective gas is nitrogen. The protective component is provided with a vent hole. The height of the vent hole is higher than the air curtain hole and the air inlet hole. The nitrogen venting in the laser welding machine protection device is changed from the traditional open venting method to venting through the vent hole, so as to increase the pressure inside the laser tube and thereby increase the positive pressure state in the laser tube, effectively preventing slag and dust from entering the laser tube. At the same time, it also increases the nitrogen environment concentration at the third reflector at the end of the laser tube, delaying the oxidation of the Mo coating on its surface.

[0058] (4) The protective component of this application is connected to a baffle. The baffle is close to the opening and located in the cavity to further increase the pressure in the laser pipeline, further increase the positive pressure state in the laser pipeline, further prevent slag and dust from entering the laser pipeline, and at the same time increase the nitrogen environment concentration at the third reflector at the end of the laser pipeline, delaying the oxidation of the Mo coating on its surface. The baffle can block some residues that are not blown out by the air curtain to protect the reflector.

[0059] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0063] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A laser welding machine protection device, characterized in that, include: The laser tube has an opening for the laser beam to pass through; A reflector is installed inside the laser tube; The nozzle is connected to the laser tube via a connecting plate. The connecting plate is provided with multiple air inlets for communicating with a gas source. The multiple air inlets are arranged sequentially along a first direction. The protective component has two ends connected to the laser tube and the nozzle, respectively. The protective component has a protective groove for the laser to pass through. The protective component and the connecting plate together form a receiving cavity that communicates with the opening and the nozzle. The protective component has an air curtain hole that communicates with the receiving cavity. The air curtain hole and the air inlet are arranged opposite to each other in a direction perpendicular to the first direction to form a protective air curtain covering the cross section of the receiving cavity.

2. The laser welding machine protection device according to claim 1, characterized in that, The protective component includes a first plate and a second plate. There are two first plates arranged opposite each other along the first direction. The second plate connects the two first plates and has air curtain holes.

3. The laser welding machine protection device according to claim 1, characterized in that, The air curtain opening is rectangular and extends to the edge of the first plate.

4. The laser welding machine protection device according to claim 1, characterized in that, The laser tube is provided with a protective gas inlet for introducing laser protective gas. The protective gas inlet is connected to the cavity of the laser tube. The protective component is provided with a vent hole, the height of which is higher than the air curtain hole and the air inlet.

5. The laser welding machine protection device according to claim 4, characterized in that, The protective component has vent holes on both of the first plates that are arranged opposite each other along the first direction.

6. The laser welding machine protection device according to claim 4, characterized in that, The venting holes are provided in multiple ways, and the multiple venting holes are spaced apart along the connection direction perpendicular to the reflector and the nozzle; Alternatively, multiple vent holes may be spaced apart along the connection direction between the reflector and the nozzle.

7. The laser welding machine protection device according to any one of claims 1 to 6, characterized in that, Includes a baffle plate near the opening, the baffle plate being connected to the protective member and located within the receiving cavity.

8. The laser welding machine protection device according to claim 7, characterized in that, The baffle is provided in multiple manner, and the multiple baffles together form a connecting channel that connects the receiving cavity and the internal cavity of the laser welding machine protection device.

9. The laser welding machine protection device according to any one of claims 1 to 3, characterized in that, The protective component and the connecting plate are bolted together.

10. The laser welding machine protection device according to any one of claims 1 to 3, characterized in that, The nozzle includes a nozzle seat and a body connected together, and the protective component is bolted to the nozzle seat.

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