CN111098027B

CN111098027B - Pulse laser welding lens

Info

Publication number: CN111098027B
Application number: CN201811249084.7A
Authority: CN
Inventors: 陈超
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2022-02-08
Anticipated expiration: 2038-10-25
Also published as: CN111098027A

Abstract

The invention discloses a pulse laser welding lens, which comprises a collimation focusing head and a blowing protection device, wherein the collimation focusing head comprises a lens cone and a lens arranged at the bottom end of the lens cone, and the pulse laser welding lens is characterized in that: the blowing protection device comprises a seat body structure connected with the bottom end of the lens cone, the seat body structure is integrally hollow, an annular gas collection cavity communicated with the outside is formed in the seat body structure, an annular gas inlet is formed in the inner side of the bottom end of the gas collection cavity, and the gas inlet is located below the lens. Through setting up cyclic annular gas collection chamber and air inlet, can form the continuous even gas curtain of round, can keep apart and blow off plasma with the external world totally to inside forms a negative pressure chamber, and is effectual keep apart outside with plasma.

Description

Pulse laser welding lens

Technical Field

The invention relates to the field of welding, in particular to a pulse laser welding lens.

Background

Laser welding has become an advanced welding method in modern industry, and the application of laser welding is more and more extensive due to high precision, less deformation, high efficiency, weldable difficult-to-weld materials and good processing flexibility, and the laser welding method is expanded from the fields of aerospace, automobiles, shipbuilding and the like to the field of household appliances. The laser welding has the advantages of high energy density, large depth-width ratio of welding seams, small heat affected zone, good welding quality, easy realization of automation and the like, and is considered to be a material processing technology with great development prospect.

Blow protection is an essential process in laser welding. Spatter and other fumes generated during laser welding easily contaminate the focusing mirror. The metal vapor and the spatter particles deposited on the focusing mirror lower the energy transfer efficiency of the laser to the workpiece and cause aberration of the laser beam, deteriorating the welding performance of the laser beam. This requires that the laser welding not only has the effect of protecting the welding seam, but also protects the focusing lens.

Present protection device, the structure of the coaxial shielding gas that blows of laser-beam welding machine as that chinese patent application number is 201710345340.1 discloses, it advances the pipe including encircleing coil pipe and shielding gas, encircle the coil pipe and wind in the outside of the same axle sleeve of laser, the shielding gas air inlet is connected to the one end of encircleing the coil pipe, the shielding gas advances the pipe and is equipped with three, all set up the lower extreme that encircles the coil pipe, go up the ring and wind the same axle sleeve of coil pipe and laser, the contained angle that the shielding gas advances between pipe and the same axle sleeve of laser is the acute angle, the coaxial junction that advances the pipe with the shielding gas on the laser is equipped with coaxial cover shielding gas air inlet.

In the blowing protection device, the gas inlet is arranged in a mode that gas needs to be provided with a gas inlet pipe from the side direction, namely the direction vertical to a lens of a welding machine, so that extra space needs to be occupied, and welding operation is hindered; in addition, the gas inlet and the three gas outlets are arranged at intervals, so that the gas is not uniform (the gas is not uniform due to the fact that the gas is discharged from one point of the gas outlet and the gas is discharged from the near end and the far end), and the protection effect is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a pulse laser welding lens which saves the operation space of the lens and has uniform air outlet.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a pulse laser welding camera lens, includes collimation focus head and the protection device that blows, the collimation focus head includes the lens cone and sets up the lens in the lens cone bottom, its characterized in that: the blowing protection device comprises a seat body structure connected with the bottom end of the lens cone, the seat body structure is integrally hollow, an annular gas collection cavity communicated with the outside is formed in the seat body structure, an annular gas inlet is formed in the inner side of the bottom end of the gas collection cavity, and the gas inlet is located below the lens.

In order to reduce the occupied space and not influence the welding operation, the top end of the gas collection cavity is provided with an air inlet, the blowing protection device further comprises an air inlet connector, the extending direction of the air inlet connector is consistent with that of the lens barrel, and the air inlet connector penetrates through the air inlet and extends into the gas collection cavity.

In order to enable air pressure of each point in the air collection cavity to be uniform, an air inlet channel penetrating through the bottom end of the air inlet connector is formed in the air inlet connector, and the ratio of the sectional area of the air collection cavity to the sectional area of the air inlet channel is 3-7.

In order to compress the gas entering from the gas inlet joint and help to form a gas curtain, the ratio of the volume of the gas collecting cavity to the cross-sectional area of the gas inlet channel is more than 50.

Preferably, the base structure includes a first base with openings at two ends, a second base with openings at two ends, and a top wall connected between the top ends of the first base and the second base, the second base is disposed in the first base and connected with the lens barrel, and the gas collecting cavity is formed among the first base, the second base and the top wall.

Preferably, in order to fix the lens, the bottom end of the lens barrel extends into the second seat body, so that the lens is clamped and fixed between the bottom end of the lens barrel and the inner peripheral wall of the second seat body.

Preferably, the second base is provided with a step portion on the inner peripheral wall near the top end, and the lens is clamped and fixed between the step portion and the bottom end of the lens.

Preferably, in order to facilitate connection between the lens barrel and the second seat body, an external thread is provided at the bottom end of the lens barrel, an internal thread is provided on the inner peripheral wall at the top end of the second seat body, the internal thread is located on the step portion, and the lens barrel and the second seat body are connected and fixed through the matching of the external thread and the internal thread.

Preferably, in order to form the air inlet, the housing further includes a bottom wall formed by extending a distance radially inward from an inner periphery of the first housing, a bottom surface of the second housing is higher than the bottom wall, and the air inlet is formed between the bottom surface of the second housing and an inner end of the bottom wall.

Preferably, the bottom surface gradually extends downwards from a side close to the first seat body to a direction away from the first seat body, so that an air flow channel gradually reduced from a position close to the first seat body to a position away from the first seat body is formed between the bottom surface and the bottom wall of the second seat body, and the minimum caliber of the air flow channel forms the air inlet.

Preferably, in order to isolate the lens from the outside, the space in the base structure below the lens and above the air inlet forms a negative pressure chamber.

Compared with the prior art, the invention has the advantages that: through setting up cyclic annular gas collection chamber and air inlet, can form the continuous even gas curtain of round, can keep apart and blow off plasma with the external world totally to inside forms a negative pressure chamber, and is effectual keep apart outside with plasma.

Drawings

Fig. 1 is a schematic structural diagram of a lens according to an embodiment of the present invention;

FIG. 2 is an exploded view of a lens barrel according to an embodiment of the present invention;

fig. 3 is a sectional view of a lens barrel according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Referring to fig. 1 to 3, a pulse laser welding lens includes a collimating focus head 1 and a blowing protection device 2.

The collimating focusing head 1 comprises a lens barrel 11 and a lens 12 arranged at the bottom end of the lens barrel 11, wherein the periphery of the bottom end of the lens barrel 11 is provided with an external thread 111 for connecting with the blowing protection device 2.

The insufflation protection apparatus 2 includes a seat structure 21 and an inlet head 22. The base structure 21 is hollow, and includes a first base 211 with two open ends, a second base 212 with two open ends, a top wall 213 connected between the top ends (toward the end of the lens barrel 11) of the first base 211 and the second base 212, and a bottom wall 214 disposed between the bottom ends (away from the end of the lens barrel 11) of the first base 211. The first base 211 and the second base 212 are radially spaced, preferably coaxially arranged, the second base 212 is located inside the first base 211, the laser light passes through the second base 212, and an annular gas collecting chamber 215 is formed among the first base 211, the second base 212, the top wall 213 and the bottom wall 214.

The inner peripheral wall of the top end of the second seat 212 is provided with an internal thread 2121, the bottom end of the lens barrel 11 extends into the inner side of the second seat 212 and is matched with the internal thread 2121 of the second seat 212 through the external thread 111 thereon, so that the collimator lens 1 and the blowing protection device 2 can be connected and fixed.

The inner peripheral wall of the second seat 212 near the top end is further provided with a step part 2122, which is matched with the end part of the lens 11 extending into the second seat 212, so as to clamp and fix the lens 12 between the step part 2122 and the bottom end of the lens 11, so as to fix the lens.

An air inlet hole 2131 is opened on the top wall 213, and the air inlet connector 22 is inserted between the first seat 211 and the second seat 212 through the air inlet hole 2131, so that the air inlet connector 22 is communicated with the air collecting chamber 215 of the seat structure 21. The air inlet joint 22 is aligned with the extending direction of the lens barrel 11 and is perpendicular to the air collecting cavity 215. Therefore, the air inlet pipe can be arranged around the lens barrel 11, and the running space of the laser head is reduced, so that the operation is not influenced by occupying extra space.

A drainage channel 222 and an air inlet channel 221 which extend longitudinally and penetrate through the air inlet joint 22 are formed in the air inlet joint 22, the drainage channel 222 is located above the air inlet channel 221 and communicated with the air inlet channel 221, the drainage channel 222 is communicated with the outside, and the air inlet channel 221 is at least partially located in the air collection cavity 215, so that the air collection cavity 215 can be communicated with the outside. The size of the diversion passage 222 and the intake passage 221 may be the same or different.

Preferably, the number of the air inlet holes 2131 is 3-10, the diameter of the air inlet channel 221 is less than 5mm, and the ratio of the sectional area of the air collecting cavity 215 to the sectional area of the air inlet channel 221 is 3-7, so that the air pressure at each point in the air collecting cavity 215 is uniform. The ratio of the volume of the gas collection cavity 215 to the sectional area of the gas inlet channel 221 is more than 50 (volume unit m)³Area unit m²Simply a numerical ratio) thereby causing the gas entering the inlet fitting 22 to be compressed, contributing to the formation of the gas curtain.

The bottom wall 214 extends radially inward a distance from the inner periphery of the first seat 211, and the inner side of the bottom wall 214 corresponds to the inner side of the bottom surface 2123 of the second seat 212. The bottom surface 2123 of the second housing 212 is elevated above the bottom wall 214, thereby forming an annular, preferably annular, air inlet 216 between the bottom surface 2123 of the second housing 212 and the inner end of the bottom wall 214. The bottom 2123 extends downward (obliquely or curved) from a side close to the first seat 211 to a direction away from the first seat 211, so that an air flow channel 2124 is formed between the bottom 2123 and the bottom wall 213 of the second seat 212, the diameter of the air flow channel 2124 is the smallest, and the air inlet 216 is formed at the position close to the first seat 211 and the direction away from the first seat 211. The included angle alpha between the air inlet 216 and the horizontal direction is 15-23 degrees.

The space within the housing structure 21 below the lens 12 and above the air inlet 216 constitutes a negative pressure chamber 217. The gas enters the negative pressure chamber 217 through the gas inlet 216, and forms a continuous and uniform gas curtain below the lens 12, thereby protecting the lens 12.

When welding, compressed air is uniformly flushed into the annular gas collecting cavity 215 through the gas inlet joint 22 and then enters the second base 212 through the annular gas inlet 216, a continuous and uniform gas curtain is formed below the lens 12, the lens 12 can be completely isolated from the outside and plasma is blown away, a negative pressure is formed inside the negative pressure cavity 217, the plasma is effectively isolated from the outside, and the function of protecting the lens 12 is achieved.

Claims

1. The utility model provides a pulse laser welding camera lens, includes collimation focus head (1) and protection device (2) of blowing, collimation focus head (1) including lens cone (11) and set up lens (12) in lens cone (11) bottom, its characterized in that: the blowing protection device (2) comprises a seat body structure (21) connected with the bottom end of the lens barrel (11), the seat body structure (21) is integrally hollow, an annular gas collection cavity (215) communicated with the outside is formed in the seat body structure (21), an annular gas inlet (216) is formed in the inner side of the bottom end of the gas collection cavity (215), and the gas inlet (216) is located below the lens (12); the top end of the gas collecting cavity (215) is provided with a gas inlet hole (2131), the blowing protection device (2) further comprises a gas inlet joint (22), the extending direction of the gas inlet joint (22) is consistent with that of the lens barrel (11), and the gas inlet joint (22) penetrates through the gas inlet hole (2131) and extends into the gas collecting cavity (215).

2. The pulse laser welding lens according to claim 1, characterized in that: an air inlet channel (221) penetrating through the bottom end of the air inlet connector (22) is formed in the air inlet connector (22), and the ratio of the sectional area of the air collecting cavity (215) to the sectional area of the air inlet channel (221) is 3-7.

3. The pulse laser welding lens according to claim 2, characterized in that: the ratio of the volume of the gas collection cavity (215) to the cross-sectional area of the gas inlet channel (221) is more than 50.

4. The pulse laser welding lens according to any one of claims 1 to 3, characterized in that: the base structure (21) comprises a first base (211) with two openings in the cylindrical shape, a second base (212) with two openings in the cylindrical shape and a top wall (213) connected between the top ends of the first base (211) and the second base (212), the second base (212) is arranged in the first base (211) and connected with the lens barrel (11), and the gas collection cavity (215) is formed among the first base (211), the second base (212) and the top wall (213).

5. The pulse laser welding lens according to claim 4, characterized in that: the bottom end of the lens cone (11) extends into the second base body (212) so as to clamp and fix the lens (12) between the bottom end of the lens cone (11) and the inner peripheral wall of the second base body (212).

6. The pulse laser welding lens according to claim 5, characterized in that: the inner peripheral wall of the second seat body (212) close to the top end is further provided with a step part (2122), and the lens (12) is clamped and fixed between the step part (2122) and the bottom end of the lens barrel (11).

7. The pulse laser welding lens according to claim 6, characterized in that: the bottom end of the lens cone (11) is provided with an external thread (111), the inner peripheral wall of the top end of the second seat body (212) is provided with an internal thread (2121), the internal thread (2121) is positioned on the step part (2122), and the lens cone (11) and the second seat body (212) are fixedly connected through the matching of the external thread (111) and the internal thread (2121).

8. The pulse laser welding lens according to any one of claims 5 to 7, wherein: the seat structure (21) further comprises a bottom wall (214) formed by extending a distance radially inward from the inner periphery of the first seat (211), the bottom surface (2123) of the second seat (212) is higher than the bottom wall (214), and the air inlet (216) is formed between the bottom surface (2123) of the second seat (212) and the inner end of the bottom wall (214).

9. The pulse laser welding lens according to claim 8, characterized in that: the bottom surface (2123) gradually extends downwards from a side close to the first seat (211) to a direction away from the first seat (211), so that an air flow channel (2124) which is gradually reduced from a position close to the first seat (211) to a direction away from the first seat (211) is formed between the bottom surface (2123) and the bottom wall (214) of the second seat (212), and the position where the aperture of the air flow channel (2124) is the smallest forms the air inlet (216).

10. The pulse laser welding lens according to any one of claims 1 to 3, characterized in that: the space in the seat body structure (21) below the lens (12) and above the air inlet (216) forms a negative pressure cavity (217).