A laser-welded splash-proof air-knife

Abstract

The application discloses a laser welding anti-splashing air sharp wind knife, which comprises an adjusting frame and a wind knife installed at the bottom of the adjusting frame, wherein the wind knife comprises a wind receiving port, a shunt cavity for shunting air upward and downward of the wind receiving port, a pressure bearing cavity for bearing shunted air on the upper and lower sides of the shunt cavity, a nozzle for spraying air of the pressure bearing cavity, and an air sharp for merging air sprayed by the nozzle; shunt holes are arranged on the upper and lower sides of the shunt cavity and are spaced apart leftward and rightward; the nozzle is located at the front end of the pressure bearing cavity; the nozzle comprises a compression part, a throat part and an expansion part; the lower profile arc curves of the compression part, the throat part and the expansion part are in a seamless connection horizontal state; the upper profile arc curve of the compression part is close to the lower profile arc curve downward and forward; the upper profile arc curve of the throat part is parallel to the lower profile arc curve; and the upper profile arc curve of the expansion part extends forward and upward away from the lower profile arc curve; the air sharp wind knife has the advantages of wider high flow speed area, thicker high flow speed area, good anti-splashing protection effect, greatly accelerated airflow, low energy loss and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air knives, and particularly relates to a laser welding anti-splashing air-jet air knife. BACKGROUND

[0002] A large amount of splashes is generated during laser welding, and the splashes can contaminate a lens and block laser transmission. Therefore, a wind knife is needed to blow the splashes away so that the splashes cannot contaminate the lens. When the splashes fly to a protection area of the wind knife, high-speed airflow blown by the wind knife makes the splashes generate transverse acceleration, the splashes generate transverse speed, and the splashes are finally blown away from a light area.

[0003] A traditional wind knife has the characteristics of high outlet wind speed, and a high-speed airflow area is very thin, so that the acceleration distance of the splashes is small, the acceleration time is short, and the transverse speed of the splashes is not fast enough when the splashes leave the acceleration area, so that some splashes can still reach the lens and contaminate the lens. SUMMARY

[0004] The application aims to provide a laser welding anti-splashing air-jet air knife, the high-flow area of the airflow is wider and thicker, and the problem that some splashes can still reach the lens and contaminate the lens due to the high outlet wind speed of the traditional wind knife and the thin high-speed airflow area is solved.

[0005] To this end, the application adopts the technical scheme that a laser welding anti-splashing air-jet air knife comprises an adjusting frame and a wind knife mounted at the bottom of the adjusting frame, the wind knife comprises air inlets located at left and right sides, a shunt cavity for shunting air of the air inlets upward and downward, pressure receiving cavities for receiving shunted air upward and downward, a nozzle for spraying air of the pressure receiving cavities, and an air jet for combining air sprayed by the nozzle, shunt holes are arranged on the upper and lower sides of the shunt cavity and spaced apart left and right, the nozzle is located at the front end of the pressure receiving cavity, and the nozzle comprises a compression part, a throat part and an expansion part which are sequentially and seamlessly connected from back to front, the upper and lower profile arc curves of the compression part, the throat part and the expansion part are in a horizontal state which is seamlessly connected, the upper profile arc curve of the compression part is close to the lower profile arc curve downward and forward, the upper profile arc curve of the throat part is parallel to the lower profile arc curve, and the upper profile arc curve of the expansion part extends forward and upward away from the lower profile arc curve, when air input by the air inlets is shunted upward and downward through the pressure receiving cavities, the shunted air is sprayed through the nozzle and can be combined into a bundle of air flow along the upper and lower sides of the air jet.

[0006] As the preferred scheme of the above scheme, the upper and lower surfaces of the air tip are symmetrical and designed as the brachistochrone curve, and the lowest point of the brachistochrone curve along the upper and lower surfaces of the air tip is tangent to the center line of the air tip, because when the surface of the air tip is a plane, the surface has an obstruction to the airflow, which reduces the airflow speed, but when the interface curve of the air tip is designed as the brachistochrone curve, the surface can greatly reduce the obstruction to the airflow, so that a higher airflow speed is obtained, the efficiency of the air knife is improved, and the design is ingenious; and the front end of the air tip is provided with a fillet, so that the manufacturing difficulty is reduced, and the use safety is improved.

[0007] Further preferably, the included angle between the upper profile arc curve and the lower horizontal profile line of the compression part is 30-50 degrees, the distance between the upper profile arc curve and the lower horizontal profile line of the throat part is 0.1-0.4 mm, and the included angle between the upper profile arc curve and the lower horizontal profile line of the expansion part is 5-15 degrees, and the nozzle structure formed in the range can greatly accelerate the airflow, reduce energy loss, and the design concept is novel.

[0008] Further preferably, the adjusting frame comprises a height adjusting rod and a wind knife mounting rod mounted on the height adjusting rod, a plurality of height adjusting mounting holes are arranged on the height adjusting rod in an up-down interval, the upper part of the wind knife mounting rod is provided with mounting holes corresponding to the height adjusting mounting holes, and the lower part of the wind knife mounting rod is provided with a connecting shaft rotatably mounted on the left and right sides of the wind knife, so that the height can be flexibly adjusted, and the application range is wide.

[0009] Further preferably, a plurality of angle adjusting positioning holes are symmetrically arranged on the left and right side walls of the wind knife in an up-down interval, and the angle adjusting positioning holes are arranged on an arc line with the connecting shaft as the center, the lower end of the wind knife mounting rod is provided with angle adjusting mounting holes matched with the angle adjusting positioning holes, so that when the wind knife is rotated to a designed angle around the connecting shaft, the wind knife can be fixed by penetrating the angle adjusting mounting holes and the angle adjusting positioning holes through a screw rod, the angle of the wind knife can be adjusted, the airflow blown out of the laser welding position in each direction can be prevented from splashing, the flexibility is high, and the application range is wide.

[0010] Further preferably, the left and right ends of the shunt cavity are connected with the air receiving port, and four shunt holes are symmetrically arranged on the upper and lower parts of the shunt cavity, and the structure is reasonable.

[0011] Further preferably, the height adjusting range of the height adjusting rod and the wind knife mounting rod is 150-200 mm, and the rotation angle of the wind knife mounting rod around the connecting shaft is -45-45 degrees.

[0012] The beneficial effects of the present application are as follows:

[0013] (1) Compared with the traditional wind knife, the high-speed airflow area is thin, and the air inlet is located on the left and right sides of the air knife, the gas of the air inlet is divided into upper and lower parts in the shunt cavity, the pressure-bearing cavity is located on the upper and lower sides of the shunt cavity to receive the divided gas, the nozzle sprays the gas in the pressure-bearing cavity, and the gas tip is used to combine the gas sprayed by the nozzle. The structure is closely connected, the design structure is ingenious, the air knife has two air ducts, which are located on the upper and lower sides of the gas tip. Two air ducts blow air at the same time, and two high-speed air flows move along the gas tip, and finally combine into one air flow after leaving the gas tip. The gas tip can constrain the flow of the upper and lower air flows, reduce the compression of the external atmospheric pressure on the air flow, so that the contraction of the combined air flow can be reduced. The combined air flow has a thicker high-speed area and a wider high-speed area; the wider high-speed area means a larger protection area, and the thicker high-speed area means better anti-splashing protection effect.

[0014] (2) The lower contour arc curves of the compression part, the throat part and the expansion part are in a seamless connection horizontal state, the upper contour arc curve of the compression part is close to the lower contour arc curve downward and forward, the upper contour arc curve of the throat part is parallel to the lower contour arc curve, and the upper contour arc curve of the expansion part extends forward and upward away from the lower contour arc curve, thereby forming a structure of rapid tightening and then slow expansion, which can greatly accelerate the airflow and effectively reduce energy loss.

[0015] In summary, the air knife has the advantages of wider high-speed area, thicker high-speed area, good anti-splashing protection effect, greatly accelerated airflow and low energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic diagram of the application.

[0017] Figure 2 The figure is a sectional view of the air knife.

[0018] Figure 3 The figure is a sectional view of the air knife. Figure 2

[0019] The figure is a sectional view of the air knife. Figure 4 Figure 3 The figure is a sectional view of the air knife.

[0020] Figure 5 The figure is a sectional view of the air knife. Figure 1 DETAILED DESCRIPTION

[0021] The application will be further described below by examples and in conjunction with the drawings:

[0022] As shown in conjunction with Figure 1 — Figure 5 A laser welding anti-splashing air tip air knife is composed of an adjusting frame 1 and an air knife 2 mounted at the bottom of the adjusting frame 1. ​​

[0023] The adjusting frame 1 is composed of a height adjusting rod 11 and a wind knife mounting rod 12 mounted on the height adjusting rod 11.

[0024] The height adjusting rod 11 is provided with a plurality of height adjusting mounting holes 111 at intervals.

[0025] The wind knife mounting rod 12 is provided with mounting holes corresponding to the height adjusting mounting holes 111 at the upper part and is provided with a connecting rotating shaft 121 rotatably mounted on the left and right sides of the wind knife 2 at the lower part.

[0026] The height adjusting range of the height adjusting rod 11 and the wind knife mounting rod 12 is preferably 150mm-200mm, and the rotating angle of the wind knife mounting rod 12 around the connecting rotating shaft 121 is preferably -45°-45°.

[0027] The left and right side walls of the wind knife 2 are provided with a plurality of angle adjusting positioning holes 26 symmetrically at intervals on the upper and lower sides, and the angle adjusting positioning holes 26 are symmetrically arranged on the circular arc with the connecting rotating shaft 121 as the center.

[0028] The lower end of the wind knife mounting rod 12 is provided with an angle adjusting mounting hole 122 matched with the angle adjusting positioning hole 26, so that when the wind knife 2 is rotated to the designed angle around the connecting rotating shaft 121, the fixing is realized by the screw rod passing through the angle adjusting mounting hole 122 and the angle adjusting positioning hole 26.

[0029] The wind knife 2 is composed of the air inlet 21 located on the left and right sides, the shunt cavity 22 for shunting the gas above and below the air inlet 21, the pressure bearing cavity 23 for bearing the shunted gas above and below the shunt cavity 22, the nozzle 24 for spraying the gas in the pressure bearing cavity 23, and the gas tip 25 for merging the gas sprayed by the nozzle 24.

[0030] The shunt cavity 22 is provided with shunt holes 221 at intervals on the left and right sides of the upper and lower sides.

[0031] The left and right ends of the shunt cavity 22 are connected with the air inlet 21, and the shunt cavity 22 is symmetrically provided with four shunt holes 221 on the upper and lower sides.

[0032] The nozzle 24 is located at the front end of the pressure bearing cavity 23.

[0033] The nozzle 24 is composed of a compression part 241, a throat part 242 and an expansion part 243 connected seamlessly from back to front.

[0034] The lower profile arc curves of the compression part 241, the throat part 242 and the expansion part 243 are all in a horizontal state connected seamlessly.

[0035] The upper profile arc curve of the compression part 241 is close to the lower profile arc curve from down to front.

[0036] The upper profile arc curve of the throat part 242 is parallel to the lower profile arc curve.

[0037] The upper profile arc curve of the expansion section 243 extends forward and upward away from the lower profile arc curve.

[0038] The angle between the upper profile arc curve of the compression section 241 and the lower horizontal profile line is preferably 30°-50°.

[0039] The distance between the upper profile arc curve of the throat section 242 and the lower horizontal profile line is preferably 0.1mm-0.4mm.

[0040] The angle between the upper profile arc curve of the expansion section 243 and the lower horizontal profile line is preferably 5°-15°.

[0041] The upper and lower surfaces of the air tip 25 are symmetrical and designed with the brachistochrone curve, and the lowest point of the brachistochrone curve of the upper and lower surfaces of the air tip 25 is tangent to the center line of the air tip 25.

[0042] The brachistochrone curve satisfies the formula:

[0043] The front end of the air tip 25 is provided with a rounded corner.

[0044] When the gas input by the air inlet 21 is split into two streams by the pressure-bearing cavity 23, the split gas is sprayed out through the nozzle 24 and can be combined into a stream along the upper and lower sides of the air tip 25.

[0045] The air tip air knife has two air channels, respectively located on the upper and lower sides of the air tip 25.

[0046] The two air channels blow air at the same time, and the two high-speed air streams advance along the air tip and finally combine into a stream after leaving the air tip. The air tip will constrain the flow of the upper and lower air streams, reducing the compression of the air stream by the external atmospheric pressure, so as to reduce the contraction of the combined air stream. The combined air stream has a thicker high-flow rate area and a wider high-flow rate area.

[0047] The wider high-flow rate area means a larger protection area, and the thicker high-flow rate area means a better protection effect.

Claims

1. A laser-welded splash-guard air-knife characterized by: The air knife (2) is installed at the bottom of the adjusting frame (1), and the air knife (2) comprises air inlets (21) located at left and right sides, a shunt cavity (22) for shunting the gas upward and downward of the air inlets (21), a pressure bearing cavity (23) for bearing the shunted gas upward and downward of the shunt cavity (22), a nozzle (24) for spraying the gas of the pressure bearing cavity (23), and a gas tip (25) for combining the gas sprayed by the nozzle (24), the shunt cavity (22) is provided with shunt holes (221) at left and right sides upward and downward, the nozzle (24) is located at the front end of the pressure bearing cavity (23), and the nozzle (24) comprises a compression part (241), a throat part (242) and an expansion part (243) which are sequentially and seamlessly connected from back to front, the lower profile arc-shaped curves of the compression part (241), the throat part (242) and the expansion part (243) are horizontally connected, the upper profile arc-shaped curve of the compression part (241) is close to the lower profile arc-shaped curve downward and forward, the upper profile arc-shaped curve of the throat part (242) is parallel to the lower profile arc-shaped curve, and the upper profile arc-shaped curve of the expansion part (243) extends forward and upward away from the lower profile arc-shaped curve, when the gas input by the air inlets (21) is shunted upward and downward through the pressure bearing cavity (23), the shunted gas is sprayed through the nozzle (24) and can be combined into a gas flow along the upper and lower sides of the gas tip (25).

2. The laser-welded splash-guard air-knife according to claim 1, wherein: The upper and lower surfaces of the gas tip (25) are symmetrical and designed by the brachistochrone curve, the lowest point of the brachistochrone curve of the upper and lower surfaces of the gas tip (25) is tangent to the center line of the gas tip (25), and the front end of the gas tip (25) is provided with a rounded corner.

3. The laser-welded splash-guard air-knife according to claim 1, wherein: The angle between the upper profile arc-shaped curve of the compression part (241) and the lower horizontal profile line is 30-50°, the distance between the upper profile arc-shaped curve of the throat part (242) and the lower horizontal profile line is 0.1-0.4 mm, and the angle between the upper profile arc-shaped curve of the expansion part (243) and the lower horizontal profile line is 5-15°.

4. The laser-welded splash-guard air-knife according to claim 1, wherein: The adjusting frame (1) comprises a height adjusting rod (11) and a wind knife mounting rod (12) mounted on the height adjusting rod (11), a plurality of height adjusting mounting holes (111) are arranged on the height adjusting rod (11) upward and downward, the upper part of the wind knife mounting rod (12) is provided with mounting holes corresponding to the height adjusting mounting holes (111), and the lower part of the wind knife mounting rod (12) is provided with a connecting rotating shaft (121) rotatably mounted on the left and right sides of the air knife (2).

5. The laser-welded splash-guard air-knife according to claim 4, wherein: A plurality of angle adjusting positioning holes (26) are symmetrically arranged on the left and right side walls of the air knife (2) upward and downward, the angle adjusting positioning holes (26) are arranged on the circular arc line with the connecting rotating shaft (121) as the center, the lower end of the wind knife mounting rod (12) is provided with an angle adjusting mounting hole (122) matched with the angle adjusting positioning hole (26), so that when the air knife (2) is rotated to the designed angle around the connecting rotating shaft (121), the air knife (2) is fixed by the screw rod passing through the angle adjusting mounting hole (122) and the angle adjusting positioning hole (26).

6. The laser-welded splash-guard air-knife according to claim 1, wherein: The left and right ends of the shunt cavity (22) are connected with the air inlets (21), and the shunt cavity (22) is symmetrically provided with four shunt holes (221) upward and downward.

7. The laser-welded splash-guard air-knife according to claim 4, wherein: The height adjustment range of the height adjustment rod (11) and the air knife mounting rod (12) is 150mm-200mm, and the rotation angle of the air knife mounting rod (12) around the connecting rotation shaft (121) is -45°-45°.

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