Protective gas device for laser welding equipment

Abstract

The invention relates to a protective gas device for laser welding equipment, and belongs to the technical field of laser welding. The device comprises a gas supply mechanism, a supporting mechanism and a flow dividing mechanism. The gas supply mechanism is used for outputting protective gas. The supporting mechanism comprises a connecting plate and two first side plates, the two first side plates are arranged at intervals, the two ends of the connecting plate are connected with the first ends of the two first side plates correspondingly, and the connecting plate is used for being connected with the air supply mechanism; the flow dividing mechanism comprises a housing, the two sides of the housing are slidably connected with two first side plates correspondingly so that the housing can vertically move relative to the supporting mechanism, the housing is provided with an air inlet structure, the air inlet structure is arranged at the first end of the housing, and the air inlet structure is used for being connected with an air supply mechanism so that protective gas can be introduced into the housing and vertically slides between the housing and the supporting mechanism. And the volume of the protection space between the housing and the supporting mechanism can be adjusted, so that the filling time of the protection gas in the protection space can be adjusted. The adjustable protective gas device has the effect of improving the adjustability of the protective gas device.

Description

Technical Field

[0001] This application relates to the technical field of laser welding, and particularly to a protective gas device for a laser welding device. Background Art

[0002] Laser welding technology plays an important role in modern industrial manufacturing and is widely used in multiple fields such as automotive, aerospace, and electronics. This technology realizes the rapid melting and solidification of materials through a laser beam with a high energy density, and has the characteristics of fast welding speed, small heat affected zone, and small deformation, which can significantly improve production efficiency and product quality.

[0003] However, in the actual application process, a key problem faced by laser welding is the oxidation of the weld area, which not only affects the welding quality but may also lead to a reduction in weld strength and poor appearance. To prevent the oxidation of the weld area, it is usually necessary to use a protective gas during the welding process. Currently, the protective gas supply system in related technologies generally supplies the protective gas into the trailing shield through a gas delivery mechanism, and the trailing shield is fixedly connected to the welding device, so that the protective gas in the trailing shield can cover the weld to achieve the protective effect.

[0004] However, the filling speed of the protective gas in the trailing shield needs to be adjusted under different welding conditions to optimize the protective effect. For example, when the thickness of the workpiece is large, the depth of the weld is deep, and it is necessary for the protective gas in the trailing shield to be quickly filled to accelerate the cooling speed of the weld; when the thickness of the workpiece is small, the depth of the weld is small, and it is necessary to appropriately extend the filling time of the protective gas to reduce the problem of uneven welding caused by too fast cooling speed of the weld. Since the internal space size of the trailing shield is fixed and the adjustability is poor, it is difficult to adapt to the influence brought by the different depths of the welds after welding of workpieces with different thicknesses, resulting in an unsatisfactory protective effect and thus affecting the welding quality.

[0005] In the above related technologies, there is a defect that the adjustability of the protective gas device is poor. Summary of the Invention

[0006] In order to improve the adjustability of the protective gas device, this application provides a protective gas device for a laser welding device.

[0007] The protective gas device for a laser welding device provided by this application adopts the following technical solutions: A protective gas device for a laser welding device, which is used to make the protective gas distributed around the weld seam after the laser welding device welds a workpiece to form a weld seam, including: a gas supply mechanism for outputting the protective gas; a support mechanism, the support mechanism includes a connecting plate and two first side plates, the two first side plates are arranged at intervals, two ends of the connecting plate are respectively connected to the first ends of the two first side plates, and the connecting plate is used to connect the gas supply mechanism; a flow splitting mechanism, the flow splitting mechanism includes a housing, two sides of the housing are respectively slidably connected to the two first side plates, so that the housing can move vertically relative to the support mechanism, the housing is provided with an air inlet structure, the air inlet structure is arranged at the first end of the housing, and the air inlet structure is used to connect the gas supply mechanism so that the protective gas can enter the housing, and the vertical sliding between the housing and the support mechanism enables the volume of the protective space between the housing and the support mechanism to be adjusted, so as to adjust the filling time of the protective gas in the protective space.

[0008] By adopting the above technical solution, the support mechanism provides a support function for the flow splitting mechanism. By connecting the two first side plates through the connecting plate, the support mechanism forms an integral structure. The flow splitting mechanism is clamped between the two first side plates. Through the relative sliding between the housing and the support mechanism, the size of the protective space above the workpiece between the housing and the support mechanism can be adjusted. The gas supply mechanism conveys the protective gas into the protective space through the air inlet structure, and forms a protection for the periphery of the weld seam through the protective gas, so as to play a role in isolating the air and reducing the risk that the weld seam is rapidly oxidized in the air and affects the welding effect; Since the housing is slidably connected to the support mechanism, the volume of the protective space formed by the housing and the support mechanism can be adjusted, so that without changing the intake flow rate of the gas supply mechanism, the filling time of the protective gas in the housing can be adjusted according to the thickness of the workpiece. Furthermore, when the thickness of the workpiece is small, the volume of the protective space between the housing and the support mechanism is large, and the filling time of the protective gas in the protective space is long, which can give the weld seam enough time to cool slowly and reduce the risk of uneven welding caused by rapid cooling; When the thickness of the workpiece is large, the volume of the protective space between the housing and the support mechanism is small, and the filling time of the protective gas in the protective space is shortened, which helps to accelerate the cooling of the weld seam by the protective gas in the protective space and reduce the problem of increased oxidation risk caused by too slow cooling speed. By making the volume of the protective space adjustable, the device can be easily applied to the welding process of workpieces with different thicknesses.

[0009] Optionally, both of the two first side plates are provided with sliding grooves, the sliding grooves extend vertically, and both sides of the housing are provided with sliding blocks, and the sliding blocks are correspondingly arranged and slidably connected to the sliding grooves.

[0010] By adopting the above technical solution, the housing and the first side plate are slid through the sliding grooves and the sliding blocks, which helps to improve the reliability of the sliding.

[0011] Optionally, the support mechanism includes two fasteners. Each of the two first side plates is provided with a fastening hole. The fasteners are arranged corresponding to the fastening holes. The fasteners are screwed to the fastening holes. The end of the fastener is used to abut against the housing, so that the housing is positioned after sliding relative to the first side plate.

[0012] By adopting the above technical solution, the fasteners can be positioned after the relative sliding of the housing and the first side plate, so that the housing will not slide randomly during use, improving stability and reliability.

[0013] Optionally, the flow splitting mechanism includes a first equalizing layer and a second equalizing layer both provided with through holes. The first equalizing layer is arranged above the second equalizing layer. The aperture of the through hole of the second equalizing layer is smaller than the aperture of the through hole of the first equalizing layer.

[0014] By adopting the above technical solution, the first equalizing layer initially evenly disperses the protective gas, and the second equalizing layer further evenly disperses the protective gas, which helps to improve the uniformity in the protection space of the protective gas, thereby optimizing the protection effect on the weld seam.

[0015] Optionally, the flow splitting mechanism includes a compression channel. The longitudinal cross-sectional area of the compression channel changes gradually, and the longitudinal cross-sectional area of the first end of the compression channel close to the air supply mechanism is larger than the longitudinal cross-sectional area of the second end of the compression channel far from the air supply mechanism. The first end of the compression channel is used to connect the air supply mechanism. An air outlet groove is provided at the second end of the housing. The second end of the compression channel can be aligned with the air outlet groove so that the air outlet groove outputs compressed gas. The air outlet groove is in a strip structure. The longitudinal cross-sectional area of the air outlet groove is equal to or smaller than the longitudinal cross-sectional area of the second end of the compression channel. The air outlet groove is arranged on one side of the welding head of the laser welding device, and the height of the air outlet groove is higher than the height of the welding point.

[0016] By adopting the above technical solution, the gradual change of the compression channel can gradually compress the input protective gas and output it from the air outlet groove, so as to spray and form a compressed gas layer, which helps to form an isolation layer above the welding head of the laser welding device, reduce the air around the welding point, and thus help to optimize the effect of isolating oxygen around the weld seam and improve the weld quality.

[0017] Optionally, the flow splitting mechanism includes a conveying channel. The conveying channel is arranged above the first equalizing layer and below the compression channel. The conveying channel includes a first end and a plurality of second ends evenly distributed. The second ends of the plurality of conveying channels are all communicated with the first end of the conveying channel. The first end of the conveying channel is used to connect the air supply mechanism. One-way valves are provided at the second ends of the plurality of conveying channels, so that the protective gas can flow out from the second ends of the conveying channel.

[0018] By adopting the above technical solution, the shielding gas output by the gas supply mechanism is input through the first end of the conveying channel and output through several second ends of the conveying channel. The shielding gas can be preliminarily split by the conveying channel, and the uniformity of the shielding gas in the housing can be improved through the second ends of several uniformly distributed conveying channels, so that the shielding gas is preliminarily split before reaching the first uniform layer. The setting of the one-way valve enables the shielding gas in the housing to only flow from the first end of the conveying channel to the second end, reducing the risk of reverse flow of the shielding gas and improving the reliability.

[0019] Optionally, the air inlet structure includes an upper air inlet and a lower air inlet. The gas supply mechanism is selectively connected to the upper air inlet or the lower air inlet. The upper air inlet includes the first end of the compression channel and the first end of the conveying channel. The lower air inlet is arranged vertically between the conveying channel and the first uniform layer. The lower air inlet is provided with a one-way valve to enable the shielding gas to flow from the gas supply mechanism into the housing.

[0020] By adopting the above technical solution, as the housing slides, after the housing slides upward in place, the gas supply mechanism can be aligned with the lower air inlet. After the shielding gas enters the housing, its uniformity is directly improved via the first uniform layer and the second uniform layer. At this time, the volume of the protection space is large and the time for the shielding gas to fill is long, which is suitable for the weld protection of workpieces with a smaller thickness. After the housing slides downward in place, the gas supply mechanism can be aligned with the upper air inlet, so that the shielding gas can be respectively supplied to the compression channel and the conveying channel. Furthermore, when welding a workpiece with a larger thickness, on the one hand, by shortening the filling time of the shielding gas, the protection effect on the welded weld is optimized; on the other hand, an air isolation effect is achieved above the welding head through the air outlet groove, reducing the risk of affecting the welding effect due to oxidation.

[0021] Optionally, the gas supply mechanism includes relatively independent first air inlet and second air inlet. At least one of the first air inlet and the second air inlet supplies the shielding gas to the protection space. The diameter of the first air inlet is larger than that of the second air inlet. The first air inlet and the second air inlet can cooperate with the lower air inlet simultaneously, or the first air inlet and the second air inlet can cooperate with the upper air inlet simultaneously. When the first air inlet and the second air inlet cooperate with the upper air inlet simultaneously, the first air inlet cooperates with the first end of the compression channel, and the second air inlet cooperates with the first end of the conveying channel.

[0022] By adopting the above technical solution, when cooperating with the lower air inlet, since the first air inlet and the second air inlet are relatively independent, at least one of the first air inlet and the second air inlet can be selectively used to convey the shielding gas, so as to improve the adjustability of the filling time of the shielding gas in the protection space and facilitate its application to workpieces with different thicknesses; when cooperating with the upper air inlet, the first air inlet cooperates with the compression channel and the second air inlet cooperates with the conveying channel, so as to simultaneously provide shielding gas for the weld seam after welding is completed, and at the same time enable the air outlet groove to eject the compressed shielding gas, which helps to improve the protection effect on the weld seam of workpieces with larger thicknesses, reduce the oxidation risk during welding and after the weld seam is completed, and optimize the welding effect.

[0023] Optionally, it further includes a shielding mechanism, which is used to cooperate with the laser welding equipment so that the shielding mechanism surrounds the periphery of the welding point. The shielding mechanism includes a front baffle and two second side plates. The second side plates are arranged corresponding to the first side plates. The first end of the second side plate is connected to the second end of the first side plate. The front baffle is arranged at the second end of the second side plate, and both ends of the front baffle are respectively connected to the second ends of the two first side plates.

[0024] By adopting the above technical solution, the shielding mechanism surrounds the periphery of the welding point, which can optimize the air isolation effect, optimize the welding effect, and at the same time reduce the safety hazards caused by metal splash during welding.

[0025] Optionally, a first exhaust part is provided on the lower side of the second end of the housing, and the first exhaust part can make the shielding gas flow from the housing into the shielding mechanism. A second exhaust part is provided on the lower side of the first end of the housing, and the support mechanism is provided with a third exhaust part. The second exhaust part cooperates with the third exhaust part to communicate the inside of the housing with the external atmosphere.

[0026] By adopting the above technical solution, the first exhaust part can make the shielding gas flow towards the welding point, so that there is an air isolation effect at the welding point, thereby optimizing the welding effect; the second exhaust part and the third exhaust part can make the gas in the protection space flow out, improving the operation safety.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The support mechanism provides support for the flow-dividing mechanism. By connecting two first side plates through a connecting plate, the support mechanism forms an integral structure. The flow-dividing mechanism is clamped between the two first side plates. Through the relative sliding between the cover and the support mechanism, the size of the protection space above the workpiece between the cover and the support mechanism can be adjusted. The air supply mechanism conveys protective gas into the protection space through the air inlet structure. The protective gas forms a protection around the outer periphery of the weld seam, playing a role in isolating air and reducing the risk that the weld seam is rapidly oxidized in the air and affects the welding effect. Since the cover is slidably connected to the support mechanism, the volume of the protection space formed by the cover and the support mechanism can be adjusted. Thus, without changing the air inlet flow rate of the air supply mechanism, the filling time of the protective gas in the cover can be adjusted according to the thickness of the workpiece. Furthermore, when the thickness of the workpiece is small, the volume of the protection space between the cover and the support mechanism is large, and the filling time of the protective gas in the protection space is long, which can give the weld seam enough time to slowly cool and reduce the risk of uneven welding caused by extremely rapid cooling. When the thickness of the workpiece is large, the volume of the protection space between the cover and the support mechanism is small, and the filling time of the protective gas in the protection space is shortened, which helps to accelerate the cooling of the weld seam by the protective gas in the protection space and reduce the problem of increased oxidation risk caused by too slow cooling speed. By making the volume of the protection space adjustable, the device can be easily applied to the welding process of workpieces with different thicknesses; 2. The cover and the first side plate are slid through a chute and a slider, which helps to improve the reliability of the sliding; 3. The fastener can achieve positioning after the relative sliding of the cover and the first side plate, so that the cover will not slide randomly during use, improving the stability and reliability. Description of the Drawings

[0028] Figure 1 is a schematic diagram of the protective gas device for a laser welding device according to an embodiment of the present application.

[0029] Figure 2 is a schematic diagram of the cover according to an embodiment of the present application.

[0030] Figure 3 is a top view of the protective gas device for a laser welding device according to an embodiment of the present application.

[0031] Figure 4 is Figure 3 the sectional view at A-A in

[0032] Description of the Reference Numerals: 1. Gas supply mechanism; 11. First air inlet; 12. Second air inlet; 2. Support mechanism; 21. Connecting plate; 211. Third exhaust part; 22. First side plate; 221. Chute; 23. Fastener; 3. Flow splitting mechanism; 31. Housing; 311. Slide block; 312. Air outlet groove; 313. First exhaust part; 314. Second exhaust part; 315. Upper air inlet; 316. Lower air inlet; 32. First equalizing layer; 33. Second equalizing layer; 34. Compression channel; 35. Delivery channel; 36. Check valve; 4. Blocking mechanism; 41. Front baffle; 42. Second side plate. Detailed implementation mode

[0033] The following is combined with the attached Figure 1 - attached Figure 4 The present application will be further described in detail below. In this embodiment, unless otherwise clearly specified, "connection", "connection" and "fixation" are understood in a broad sense, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection and interaction between two components, etc., which can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features therebetween. Moreover, in the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present application. Without contrary explanation, the orientation terms such as "inside, outside" used in the present application refer to the contour of the corresponding component itself.

[0035] As Figure 1 As shown, the embodiment of the present application discloses a protective gas device for a laser welding device (hereinafter simply referred to as "device"). The device includes a gas supply mechanism 1, a support mechanism 2 and a flow splitting mechanism 3, and the device is used to distribute the protective gas around the weld after the laser welding device welds the workpiece to form a weld.

[0036] The support mechanism 2 includes a connecting plate 21 and two first side plates 22. The two first side plates 22 are parallel to each other and arranged at intervals. The two ends of the connecting plate 21 are respectively connected to the first ends of the two first side plates 22. The connecting plate 21 is used to connect the air supply mechanism 1. By connecting the two first side plates 22 through the connecting plate 21, the support mechanism 2 forms an integral structure, and the support mechanism 2 provides a supporting effect for the flow dividing mechanism 3. The laser welding equipment is connected to the support mechanism 2 or the flow dividing mechanism 3, and the connection structure of the laser welding equipment can be selected from existing structures such as hoop.

[0037] As Figure 1 and Figure 2 shown, the flow dividing mechanism 3 includes a housing 31. The two sides of the housing 31 are respectively slidably connected to the two first side plates 22, so that the housing 31 can move vertically relative to the support mechanism 2. The vertical sliding between the housing 31 and the support mechanism 2 enables the volume of the protection space between the housing 31 and the support mechanism 2 to be adjusted, so as to adjust the filling time of the protection gas in the protection space, and further facilitate the adjustment of the concentration of the protection gas in the protection space. The flow dividing mechanism 3 is clamped between the two first side plates 22. By the relative sliding between the housing 31 and the support mechanism 2, the size of the protection space above the workpiece between the housing 31 and the support mechanism 2 can be adjusted. There can be a certain gap between the first side plate 22 and the housing 31, so that high-temperature resistant and fireproof cloth can be arranged on the inner sides of both the first side plate 22 and the housing 31 to ensure the use safety.

[0038] The air supply mechanism 1 is used to output the protection gas. The housing 31 is provided with an air inlet structure. The air inlet structure is arranged at the first end of the housing 31 and is used to connect the air supply mechanism 1, so that the protection gas can enter the housing 31. The air supply mechanism 1 conveys the protection gas into the protection space through the air inlet structure, and forms a protection for the outer periphery of the weld through the protection gas, so as to play a role in isolating the air and reducing the risk that the weld is rapidly oxidized in the air and affects the welding effect.

[0039] As Figure 1 and Figure 2As shown, since the housing 31 is slidably connected to the support mechanism 2, the volume of the protection space formed by the housing 31 and the support mechanism 2 can be adjusted. Furthermore, without changing the intake air flow rate of the air supply mechanism 1, the filling time of the protective gas in the housing 31 can be adjusted according to the thickness of the workpiece. Specifically, when the thickness of the workpiece is small, the housing 31 slides upward, making the volume of the protection space between the housing 31 and the support mechanism 2 larger, and the filling time of the protective gas in the protection space longer. This can give the weld enough time to cool slowly, reducing the risk of uneven welding caused by rapid cooling. When the thickness of the workpiece is large, the weld is wide and deep. The housing 31 slides downward, making the volume of the protection space between the housing 31 and the support mechanism 2 smaller, and the filling time of the protective gas in the protection space shorter. This helps to accelerate the cooling of the weld by the protective gas in the protection space, reducing the problem of increased oxidation risk caused by too slow a cooling rate. At the same time, it helps to reduce the consumption of the protective gas. By making the volume of the protection space adjustable, the device can be easily applied to the welding process of workpieces with different thicknesses. It can be understood that when the protection space is filled with the protective gas, it can provide a more reliable protection effect for the weld of the workpiece below the protection space, improving the anti-oxidation effect.

[0040] Optionally, two first side plates 22 are each provided with a chute 221 that extends vertically. Both sides of the housing 31 are provided with sliders 311, and the sliders 311 are arranged corresponding to the chutes 221 and are slidably connected. The housing 31 and the first side plates 22 are slid by means of the chutes 221 and the sliders 311, which helps to improve the reliability of the sliding. A handle can be provided on the housing 31 to facilitate the sliding of the housing 31.

[0041] As Figure 1 , Figure 2 and Figure 3 shown, optionally, the support mechanism 2 includes two fasteners 23. Both first side plates 22 are provided with horizontally penetrating fastening holes, and the fasteners 23 are arranged corresponding to the fastening holes. The fasteners 23 can be bolts, and the fastening holes are threaded holes. The fasteners 23 are screwed into the fastening holes, and the ends of the fasteners 23 are used to abut against the housing 31 to position the housing 31 after it slides relative to the first side plates 22. The fasteners 23 can achieve positioning after the housing 31 and the first side plates 22 slide relative to each other, so that the housing 31 will not slide randomly during use, improving stability and reliability.

[0042] Optionally, the device further includes a shielding mechanism 4. The shielding mechanism 4 includes a front baffle 41 and two second side plates 42. The second side plates 42 are arranged corresponding to the first side plates 22, and the first ends of the second side plates 42 are connected to the second ends of the first side plates 22. The front baffle 41 is arranged at the second ends of the second side plates 42, and both ends of the front baffle 41 are respectively connected to the second ends of the two first side plates 22. The shielding mechanism 4 is used to cooperate with the laser welding equipment so that the shielding mechanism 4 surrounds the periphery of the welding point, thereby optimizing the air isolation effect, optimizing the welding effect, and reducing the safety hazard caused by metal splash during welding.

[0043] As Figure 1 , Figure 2 and Figure 4 shown, optionally, a first exhaust portion 313 is provided on the lower side of the second end of the housing 31. The first exhaust portion 313 can make the protective gas flow from the housing 31 into the shielding mechanism 4. The first exhaust portion 313 can make the protective gas flow towards the welding point, so that there is an air isolation effect at the welding point, thereby optimizing the welding effect. A second exhaust portion 314 is provided on the lower side of the first end of the housing 31. A third exhaust portion 211 is formed in the connecting plate 21 of the support mechanism 2. The second exhaust portion 314 cooperates with the third exhaust portion 211 to communicate the interior of the housing 31 with the external atmosphere. The second exhaust portion 314 and the second exhaust portion 314 can make gases such as air and protective gas in the protective space flow out, improving the operation safety.

[0044] Optionally, the flow splitting mechanism 3 includes a first uniform layer 32 and a second uniform layer 33 both provided with through holes. The first uniform layer 32 is arranged above the second uniform layer 33, and the aperture of the through holes in the second uniform layer 33 is smaller than that of the through holes in the first uniform layer 32. The first uniform layer 32 preliminarily uniformly disperses the protective gas, and the second uniform layer 33 further uniformly disperses the protective gas, which helps to improve the uniformity in the protective space of the protective gas, thereby optimizing the protection effect on the weld. The first uniform layer 32 can be provided with a cavity, and a steel wool ball can be arranged in the cavity to play a role in preliminary equalization; the second uniform layer 33 can be a copper mesh.

[0045] As Figure 1 , Figure 2 and Figure 4As shown, optionally, the flow splitting mechanism 3 includes a compression channel 34. Along the length direction of the compression channel 34, the longitudinal cross-sectional area of the compression channel 34 gradually changes, and the longitudinal cross-sectional area of the first end of the compression channel 34 close to the air supply mechanism 1 is larger than that of the second end of the compression channel 34 far from the air supply mechanism 1. The first end of the compression channel 34 is used to connect to the air supply mechanism 1, and an air outlet groove 312 is provided at the second end of the housing 31. The second end of the compression channel 34 can be aligned with the air outlet groove 312 to output compressed gas from the air outlet groove 312. The air outlet groove 312 is provided on one side of the welding head of the laser welding device, and the height of the air outlet groove 312 is higher than the height of the solder joint, so as to form an isolation layer above the solder joint. The height of the air outlet groove 312 can be higher than the height of the top of the front baffle 41, so that the compressed gas can be discharged smoothly. The air outlet groove 312 has a strip structure, and the longitudinal cross-sectional area of the air outlet groove 312 is equal to or smaller than that of the second end of the compression channel 34. The gradual change of the compression channel 34 can gradually compress the input protective gas and output it from the air outlet groove 312, so as to spray and form a compressed gas layer, which helps to form an isolation layer above the welding head of the laser welding device, reduce the air around the solder joint, and thus helps to optimize the effect of isolating oxygen around the weld seam and improve the weld quality.

[0046] Optionally, the flow splitting mechanism 3 includes a delivery channel 35. The delivery channel 35 is provided above the first equalizing layer 32 and below the compression channel 34. The delivery channel 35 includes a first end and a plurality of second ends evenly distributed. The first end of the delivery channel 35 is used to connect to the air supply mechanism 1, and the plurality of second ends of the delivery channel 35 are all communicated with the first end of the delivery channel 35. The protective gas output by the air supply mechanism 1 is input through the first end of the delivery channel 35 and output from the plurality of second ends of the delivery channel 35. The delivery channel 35 can preliminarily split the protective gas and improve the uniformity of the protective gas in the housing 31 through the plurality of second ends of the delivery channel 35 evenly distributed, so that the protective gas is preliminarily split before reaching the first equalizing layer 32. One-way valves 36 are provided at the plurality of second ends of the delivery channel 35, so that the protective gas can only flow from the first end of the delivery channel 35 to the second end and flow out from the second end of the delivery channel 35, reducing the risk of reverse flow of the protective gas and improving the reliability. A flow cavity is provided in the delivery channel 35. The upper end of the flow cavity is connected to the first end of the delivery channel 35, and the lower end of the flow cavity is communicated with the plurality of second ends of the delivery channel 35. Since the compression channel 34 and the delivery channel 35 are not communicated and there is a vertical interval therebetween, the volume of the protection space can be reduced after the housing 31 slides down vertically, and the time for filling the protective gas and achieving a reliable protection effect can be shortened.

[0047] As Figure 1 、 Figure 2 and Figure 4As shown, optionally, the air intake structure includes an upper air intake 315 and a lower air intake 316, and the air supply mechanism 1 is selectively connected to the upper air intake 315 or the lower air intake 316. The upper air intake 315 includes the first end of the compression channel 34 and the first end of the conveying channel 35. The lower air intake 316 is arranged vertically between the conveying channel 35 and the first uniform layer 32. The lower air intake 316 is provided with a one-way valve to allow the protective gas to flow only from the air supply mechanism 1 into the housing 31. As the housing 31 slides, after the housing 31 slides upward in place, the air supply mechanism 1 can be aligned with the lower air intake 316. After the protective gas enters the housing 31, the uniformity is directly improved via the first uniform layer 32 and the second uniform layer 33. At this time, the volume of the protection space is large and the time for filling the protective gas is long, which is suitable for the weld protection of workpieces with a small thickness; after the housing 31 slides downward in place, the air supply mechanism 1 can be aligned with the upper air intake 315, so as to convey the protective gas to the compression channel 34 and the conveying channel 35 respectively. Furthermore, when welding a workpiece with a large thickness, on the one hand, by shortening the filling time of the protective gas, the protection effect on the weld that has been welded is optimized, and on the other hand, an air isolation effect is achieved above the welding point through the air outlet groove 312, reducing the risk of affecting the welding effect due to oxidation.

[0048] As Figure 1 , Figure 2 and Figure 4 As shown, optionally, the air supply mechanism 1 includes relatively independent first air intake 11 and second air intake 12, and at least one of the first air intake 11 and the second air intake 12 conveys the protective gas to the protection space. The first air intake 11 and the second air intake 12 can cooperate with the lower air intake 316 simultaneously, or the first air intake 11 and the second air intake 12 can cooperate with the upper air intake 315 simultaneously. When the thickness of the workpiece is large, when the first air intake 11 and the second air intake 12 cooperate with the upper air intake 315 simultaneously, the first air intake 11 cooperates with the first end of the compression channel 34, and the second air intake 12 cooperates with the first end of the conveying channel 35. The diameter of the first air intake 11 is larger than that of the second air intake 12. Normally, when the thickness of the workpiece being processed is small, only the second air intake 12 is used to convey the protective gas, reducing the problem of uneven welding caused by the too-fast input of the protective gas; at this time, the first air intake 11 is a standby air intake, which can be used alone or simultaneously with the second air intake 12 to deal with situations such as the failure of the first air intake 11. It can be understood that the air supply mechanism 1 also includes necessary structures for functions such as the storage and conveyance of the protective gas, and existing structures can be selected according to needs.

[0049] When the gas supply mechanism 1 cooperates with the lower air inlet 316, since the first air inlet 11 and the second air inlet 12 are relatively independent, at least one of the first air inlet 11 and the second air inlet 12 can be selectively used to transport the protective gas, so as to improve the adjustability of the filling time of the protective gas in the protection space, and it is convenient to be applicable to the use conditions of workpieces with different thicknesses. When the gas supply mechanism 1 cooperates with the upper air inlet 315, the first air inlet 11 cooperates with the compression channel 34, and the second air inlet 12 cooperates with the transport channel 35, so as to simultaneously provide the protective gas for the weld seam completed by welding, and at the same time enable the air outlet groove 312 to eject the compressed protective gas, which helps to improve the protection effect on the weld seam of the workpiece with a larger thickness, reduce the oxidation risk during welding and after the weld seam is completed, and optimize the welding effect. It can be understood that the device also includes necessary structures for functions such as connection, support, drive, positioning, sealing, limit and control, etc., so that the device can operate normally; parameters such as the shape, size, material and setting quantity of each part of the device can be determined according to needs, as long as the corresponding functions can be achieved.

[0050] The implementation principle of a protective gas device for a laser welding device in an embodiment of the present application is as follows: The shunt mechanism 3 is clamped between two first side plates 22. By the relative sliding between the cover 31 and the support mechanism 2, the size of the protection space above the workpiece between the cover 31 and the support mechanism 2 can be adjusted. The gas supply mechanism 1 transports the protective gas into the protection space through the air inlet structure, and forms a protection for the outer periphery of the weld seam through the protective gas, so as to play a role in isolating the air and reduce the risk that the weld seam is rapidly oxidized in the air and affects the welding effect; without changing the air inlet flow rate of the gas supply mechanism 1, when the thickness of the workpiece is small, the volume of the protection space between the cover 31 and the support mechanism 2 is large, and the filling time of the protective gas in the protection space is long, which can give the weld seam enough time to cool slowly and reduce the risk of uneven welding caused by extremely rapid cooling; when the thickness of the workpiece is large, the volume of the protection space between the cover 31 and the support mechanism 2 is small, and the filling time of the protective gas in the protection space is shortened, which helps to accelerate the cooling of the weld seam by the protective gas in the protection space and reduce the problem of increased oxidation risk caused by too slow cooling speed. By making the volume of the protection space adjustable, the device can be convenient to be applicable to the welding process of workpieces with different thicknesses.

[0051] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A protective gas device for laser welding equipment, which is used to enable the protective gas to be distributed around the weld after the laser welding equipment welds the workpiece to form a weld, and is characterized in that: include: A gas supply mechanism (1), used for outputting protective gas; A support mechanism (2), the support mechanism (2) comprising a connecting plate (21) and two first side plates (22), the two first side plates (22) being arranged at an interval, the two ends of the connecting plate (21) being respectively connected to the first ends of the two first side plates (22), and the connecting plate (21) being used for connecting to the air supply mechanism (1); The diversion mechanism (3) comprises a cover shell (31), and the two sides of the cover shell (31) are respectively slidably connected to the two first side plates (22), so that the cover shell (31) can move vertically relative to the support mechanism (2); the cover shell (31) is provided with an air intake structure, and the air intake structure is arranged at the first end of the cover shell (31); the air intake structure is used to connect the air supply mechanism (1) so that the protective gas can pass into the cover shell (31); the vertical sliding between the cover shell (31) and the support mechanism (2) makes the volume of the protective space between the cover shell (31) and the support mechanism (2) adjustable, so as to adjust the filling time of the protective gas in the protective space.

2. The protective gas device for laser welding equipment according to claim 1, characterized in that: The two first side plates (22) are each provided with a slide groove (221), the slide groove (221) extending vertically, and both sides of the cover shell (31) are provided with a slider (311), the slider (311) being arranged correspondingly to the slide groove (221) and being slidably connected.

3. The protective gas device for laser welding equipment according to claim 2, characterized in that: The support mechanism (2) comprises two fasteners (23), the two first side plates (22) are each provided with a fastening hole, the fasteners (23) are arranged corresponding to the fastening holes, the fasteners (23) are screwed into the fastening holes, and the ends of the fasteners (23) are used to press against the cover shell (31) so that the cover shell (31) is positioned after sliding relative to the first side plate (22).

4. The protective gas device for laser welding equipment according to claim 1, characterized in that: The flow dividing mechanism (3) comprises a first balancing layer (32) and a second balancing layer (33), both of which are provided with through holes; the first balancing layer (32) is arranged above the second balancing layer (33); and the aperture of the through hole of the second balancing layer (33) is smaller than the aperture of the through hole of the first balancing layer (32).

5. The protective gas device for laser welding equipment according to claim 4, characterized in that: The flow dividing mechanism (3) comprises a compression channel (34), the longitudinal cross-sectional area of ​​the compression channel (34) changes gradually, the longitudinal cross-sectional area of ​​the first end of the compression channel (34) close to the air supply mechanism (1) is larger than the longitudinal cross-sectional area of ​​the second end of the compression channel (34) away from the air supply mechanism (1), the first end of the compression channel (34) is used to connect to the air supply mechanism (1), the second end of the cover (31) is provided with an air outlet groove (312), the second end of the compression channel (34) can be aligned with the air outlet groove (312), so that the air outlet groove (312) outputs compressed gas, the air outlet groove (312) is in a strip structure, the longitudinal cross-sectional area of ​​the air outlet groove (312) is equal to or smaller than the longitudinal cross-sectional area of ​​the second end of the compression channel (34), the air outlet groove (312) is provided on one side of the welding head of the laser welding equipment, and the height of the air outlet groove (312) is higher than the height of the welding point.

6. The protective gas device for laser welding equipment according to claim 5, characterized in that: The diversion mechanism (3) comprises a conveying channel (35), wherein the conveying channel (35) is arranged above the first uniform layer (32), and the conveying channel (35) is arranged below the compression channel (34). The conveying channel (35) comprises a first end and a plurality of uniformly distributed second ends, wherein the second ends of the plurality of conveying channels (35) are all connected to the first end of the conveying channel (35), and the first end of the conveying channel (35) is used to connect to the gas supply mechanism (1), and the second ends of the plurality of conveying channels (35) are all provided with a one-way valve (36) so that the protective gas can flow out from the second end of the conveying channel (35).

7. The protective gas device for laser welding equipment according to claim 6, characterized in that: The air intake structure comprises an upper air intake port (315) and a lower air intake port (316); the air supply mechanism (1) is selectively connected to the upper air intake port (315) or the lower air intake port (316); the upper air intake port (315) comprises a first end of the compression channel (34) and a first end of the delivery channel (35); the lower air intake port (316) is arranged between the delivery channel (35) and the first uniform layer (32) in a vertical direction; the lower air intake port (316) is provided with a one-way valve to allow the protective gas to flow from the air supply mechanism (1) into the housing (31).

8. The protective gas device for laser welding equipment according to claim 7, characterized in that: The air supply mechanism (1) comprises a relatively independent first air inlet (11) and a second air inlet (12); at least one of the first air inlet (11) and the second air inlet (12) supplies protective gas to the protective space; the diameter of the first air inlet (11) is greater than the diameter of the second air inlet (12); the first air inlet (11) and the second air inlet (12) can cooperate with the lower air inlet (316) at the same time, or the first air inlet (11) and the second air inlet (12) can cooperate with the upper air inlet (315) at the same time; when the first air inlet (11) and the second air inlet (12) cooperate with the upper air inlet (315) at the same time, the first air inlet (11) cooperates with the first end of the compression channel (34), and the second air inlet (12) cooperates with the first end of the delivery channel (35).

9. The protective gas device for laser welding equipment according to claim 1, characterized in that: It also includes a shielding mechanism (4), which is used to cooperate with the laser welding equipment so that the shielding mechanism (4) is arranged around the periphery of the welding point, and the shielding mechanism (4) includes a front baffle plate (41) and two second side plates (42), the second side plates (42) are arranged corresponding to the first side plates (22), the first end of the second side plate (42) is connected to the second end of the first side plate (22), the front baffle plate (41) is arranged at the second end of the second side plate (42), and the two ends of the front baffle plate (41) are respectively connected to the second ends of the two first side plates (22).

10. The shielding gas device for laser welding equipment according to claim 9, characterized in that: A first exhaust portion (313) is provided at the lower side of the second end of the cover shell (31), and the first exhaust portion (313) can allow the protective gas to flow from the cover shell (31) into the shielding mechanism (4). A second exhaust portion (314) is provided at the lower side of the first end of the cover shell (31), and the support mechanism (2) is provided with a third exhaust portion (211). The second exhaust portion (314) cooperates with the third exhaust portion (211) to connect the interior of the cover shell (31) with the external atmosphere.

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