CN218109673U - Nozzle laser welding auxiliary device - Google Patents

Abstract

The utility model relates to a nozzle laser welding auxiliary device, include: the transmission module is used for driving the weldment to rotate through gear engagement; the fixing seat is provided with a through hole; the weldment fixing module is arranged in the through hole of the fixing seat and used for fixing the weldment at a preset position and releasing protective gas; the guide shaft is connected with the fixed seat; the sliding rail module is connected with the guide shaft; and the weldment pressing module is connected with the sliding rail module and used for moving along the direction of the guide shaft so as to press the weldment. Compared with the prior art, the utility model has the advantages of fix a position accurately, welding efficiency is high.

Description

Nozzle laser welding auxiliary device

Technical Field

The utility model relates to a welding auxiliary device especially relates to a nozzle laser welding auxiliary device.

Background

The traditional welding structure easily causes larger residual deformation and welding internal stress, and as most of welding methods adopt local heating, welded parts inevitably generate certain welding deformation and welding stress in the structure, thereby affecting the bearing capacity, the processing precision and the dimensional stability of the structure. At the same time, stress concentrations can also occur at the interface between the weld seam and the weldment, which have a large effect on brittle fracture of the structure. Due to the different welding technologies, a certain number of defects in the welded joint are inevitable. The presence of these defects can reduce the strength of the component, cause stress concentrations, and impair weld compactness.

The laser welding technique belongs to fusion welding, and uses laser beam as energy source to make it impact on the welded piece joint so as to attain the goal of welding. The laser welding is an efficient and precise welding method using a laser beam with high energy density as a heat source, and has the advantages of high efficiency, precision, simplicity, easy operation and the like. Laser welding is now widely used in various industries, such as: the industrial manufacturing fields of electronic parts, automobile manufacturing, aerospace and the like.

The quality of laser welding is affected by a number of factors, the location of the weld being one of the important factors. Current laser welding typically fixes the weldment to the welding fixture and removes the weldment after welding is complete. The existing welding fixture is suitable for clamping objects with more seamed edges, and can not accurately fix small and smooth weldment at the edges. Therefore, the method for laser welding by using the universal welding fixture is suitable for application scenes with small welding quantity and low precision requirement. There is currently a lack of a welding aid for welding small volume, smooth-edged weldments, in particular nozzles.

In summary, the currently existing welding assistance devices have the following disadvantages:

(1) The small-size and smooth-edge weldment cannot be accurately and precisely fixed, and particularly a positioning device for accurately positioning a nozzle is lacked;

(2) Most of the existing welding auxiliary devices can only fix one weldment at a time, and in a use scene with fast production takt, the production efficiency is limited by frequently disassembling and assembling the weldment;

(3) The gas pipe is additionally arranged to convey protective gas to the welding part, so that uneven gas supply is easy to cause insufficient protection.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a welding auxiliary device that can accurate fixed nozzle in order to carry out the welding in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

the utility model discloses an aspect provides a nozzle laser welding auxiliary device, include: the transmission module is used for driving the weldment to rotate through gear engagement; the fixing seat is provided with a through hole; the weldment fixing module is arranged in the through hole of the fixing seat and connected with the transmission module, and the weldment fixing module is used for fixing a weldment at a preset position; the guide shaft is connected with the fixed seat; the sliding rail module is arranged on the guide shaft; and the weldment pressing module is connected with the sliding rail module and used for moving along the direction of the guide shaft so as to press the weldment.

As preferred technical scheme, the weldment fixing module includes an adapter plate, one or more gear units and one or more positioning units that are connected with the adapter plate and the fixing base respectively, the adapter plate is connected with the fixing base, the gear unit includes: the rotating shaft is connected with the adapter plate, one end of the rotating shaft is provided with a connecting seat, the connecting seat is provided with an opening for releasing gas and a groove for mounting the positioning unit, and the other end of the rotating shaft is provided with a gas connector; the gear is matched and connected with the rotating shaft and is connected with the transmission module; the bearing, with the pivot cooperation, and with the fixing base is connected, the positioning unit includes: the positioning seat is matched with the connecting seat, and a gas channel is arranged in the positioning seat; and the positioning pin is connected with the positioning seat and is provided with an opening for releasing gas, and the positioning pin is matched with the weldment.

As an optimized technical scheme, the gear lubricating device further comprises a gear lubricating module arranged in the fixed seat, a cover plate used for adding lubricating liquid is arranged on the upper surface of the fixed seat, the gear lubricating module comprises an oil nozzle, a supporting shaft and a lubricating gear matched with the supporting shaft, the oil nozzle is connected with one end of the supporting shaft, and the other end of the supporting shaft is connected with the adapter plate.

As a preferred technical scheme, the weldment pressing module comprises a base and a base connecting plate which are respectively connected with the slide rail module, a connecting plate shaft sleeve which is respectively connected with the base and the base connecting plate, and one or more limiting units, wherein through holes are respectively formed in the base and the base connecting plate and are matched with the guide shaft, and the connecting plate shaft sleeve, the base and the base connecting plate form a columnar body; the limiting unit comprises a top pin and a first connecting shaft and a second connecting shaft which are matched with the top pin, the first connecting shaft is connected with the base, the second connecting shaft is connected with the base connecting plate, and a hand wheel is arranged at one end of the top pin and used for adjusting the distance between the top pin and the weldment so as to compress the weldment.

According to a preferable technical scheme, the transmission module comprises a motor, a speed reducer and a transmission gear, the motor is in power connection with the speed reducer, the speed reducer is in power connection with the transmission gear, and the transmission gear is located in the fixed seat and is connected with the weldment fixing module.

As a preferred technical scheme, the welding piece fixing module further comprises a housing module which is positioned around the transmission module and used for protecting the transmission module and introducing protective gas, wherein the housing module comprises a cylindrical shell and a gas inlet and outlet assembly, the cylindrical shell is connected with the welding piece fixing module, one end of the cylindrical shell is provided with an inner groove, and an opening is formed in the inner groove; the gas inlet and outlet assembly comprises a gas inlet joint, a gas exhaust and one or more gas outlet joints, the gas exhaust is matched with the holes in the cylindrical shell, and the gas outlet joints are connected with the weldment fixing module through gas passages.

As a preferable technical scheme, a window for overhauling is arranged on the cylindrical shell.

As a preferable technical scheme, the slide rail module comprises a rail, a sliding block, an L-shaped block and a handle, the rail is connected with the guide shaft, the sliding block is movably connected with the rail and connected with the weldment pressing module, the L-shaped block is connected with the rail, and the handle is connected with the L-shaped block.

As a preferred technical solution, the slide rail module further includes a limiting block disposed at one end of the rail for preventing the sliding block from sliding out of the rail.

Preferably, the guide shaft is provided with a top plate at one end far away from the fixed seat.

Compared with the prior art, the utility model has the advantages of it is following:

(1) By arranging the weldment fixing module, the weldment can be fixed on the positioning pins of the fixing unit, and then the weldment pressing module presses the weldment along the sliding rail module, so that the workpiece is accurately positioned;

(2) The fixing seat can be provided with a plurality of gear units and positioning units, a plurality of weldments are fixed on the fixing seat, the welding machine is arranged at a fixed position, the transmission module drives the gear units and the fixing units to rotate, the welding of a single weldment can be completed, and then the auxiliary device integrally rotates for a certain angle to enable the next weldment to reach the welding position, so that the welding efficiency is improved;

(3) The protective gas air supply channel is built in the auxiliary device, only the air inlet connector on the housing module is connected with the air supply device, and the protective gas can finally reach the product through the air exhaust and air outlet connector, the rotating shaft of the gear module, the positioning seat and the positioning pin, so that the product is protected.

Drawings

FIG. 1 is a schematic view of a welding assist apparatus in an embodiment;

FIG. 2 is a front view of the gear unit in the embodiment;

FIG. 3 is a sectional view of the gear unit in the embodiment;

FIG. 4 is an elevation view of one implementation of a positioning module in an embodiment;

FIG. 5 is a front view of another implementation of a positioning module in an embodiment;

FIG. 6 is a front view of a slide rail module according to an embodiment;

FIG. 7 is a front view of the position limiting unit in the embodiment;

FIG. 8 is a sectional view of a stopper unit in the embodiment;

FIG. 9 is a front view of the gear lubrication module of the embodiment;

FIG. 10 is a front view of an embodiment of a housing module;

FIG. 11 is a bottom view of the housing module of the embodiment;

figure 12 is a schematic view of an embodiment of an air inlet and outlet assembly,

wherein, 1, a transmission module, 11, a motor, 12, a speed reducer, 13 and a transmission gear,

2. a fixed seat is arranged on the base body,

3. a weldment fixing module 31, an adapter plate 32, a gear unit 321, a rotating shaft 322, a connecting seat 323, a gas joint 324, a gear 325, a bearing 326, a gasket 327, a first deep groove bearing 328, a key 329, a first shaft retainer ring 33, a positioning unit 331, a positioning seat 332, a positioning pin 333, a spring 334 and a screw,

4. a guide shaft is arranged on the guide shaft,

5. a slide rail module 51, a track 52, a slide block 53, an L-shaped block 54, a handle 55, a limit block 56 and a small backing plate,

6. the weldment pressing module comprises a 61, a base, a 62, a base connecting plate, a 63, a connecting plate shaft sleeve, a 64, a limiting unit, a 641, a top pin, a 642, a first connecting shaft, a 643, a second connecting shaft, an 644, a hand wheel, a 645, a third connecting shaft, a 646, a fourth connecting shaft, a 647, a second deep groove bearing, a 648, a third deep groove bearing, a 649, an oilless bushing, a 650, a fifth connecting shaft, a 651, a retaining ring for a second shaft, a 652 and a pin sleeve,

7. a gear lubricating module 71, a nozzle tip 72, a support shaft 73, a lubricating gear 74, a third shaft retainer ring,

8. the encloser module 81, the cylindrical shell 82, the air inlet and outlet assembly 821, the air inlet joint 822, the air exhaust joint 823, the air outlet joint 83 and the window,

9. a top plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Example 1

Fig. 1 is a perspective view of the welding assistance device of the present embodiment, including: the transmission module 1 is used for driving the weldment to rotate through gear engagement; the fixing seat 2 is provided with a through hole; the weldment fixing module 3 is arranged in the through hole of the fixing seat 2 and is used for fixing the weldment at a preset position; the guide shaft 4 is connected with the fixed seat 2; the sliding rail module 5 is connected with the guide shaft 4, and a top plate 9 is arranged at one end, far away from the fixed seat 2, of the guide shaft 4; the weldment pressing module 6 is arranged on the sliding rail module 5 and used for moving along the direction of the guide shaft 4 to press the weldment; and the housing module 8 is positioned around the transmission module 1 and used for protecting the transmission module 1 and introducing protective gas.

The transmission module 1 comprises a motor 11, a speed reducer 12 and a transmission gear 13, the motor 11 is in power connection with the speed reducer 12, the speed reducer 12 is in power connection with the transmission gear 13, and the transmission gear 13 is located in the fixed seat 2 and is connected with the weldment fixing module 3. The motor 11 adopts a beta iS 8/3000B-4 type motor, the speed reducer 12 adopts an AD1101-P0403401401 type speed reducer, and the transmission gear 13 adopts an SSG2-100 bearing.

The weldment pressing module 6 comprises a base 61 and a base connecting plate 62 which are respectively connected with the slide rail module 5, a connecting plate shaft sleeve 63 and six limiting units 64 which are respectively connected with the base 61 and the base connecting plate 62, through holes are formed in the base 61 and the base connecting plate 62 and are matched with the guide shaft 4, and the connecting plate shaft sleeve 63, the base 61 and the base connecting plate 62 form a columnar body.

Wherein, weldment fixed module 3 includes adapter plate 31, six gear unit 32 and two positioning unit 33 that are connected with adapter plate 31 and fixing base 2 respectively, and adapter plate 31 is connected with fixing base 2.

As shown in fig. 2-3, which are schematic views of the gear unit 32, the gear unit 32 includes: a rotating shaft 321 connected with the adapter plate 31, wherein one end of the rotating shaft is provided with a connecting seat 322, the connecting seat 322 is provided with an opening for releasing gas and a groove for installing the positioning unit 33, and the other end of the rotating shaft 321 is provided with a gas joint 323; a gear 324 engaged and connected with the rotation shaft 321, the gear 324 being connected with the transmission module 1; the bearing 325 is engaged with the rotating shaft 321 and connected to the fixing base 2. A washer 326 is disposed between the bearing 325 and the gear 324 and engages with the shaft 321. A first deep groove bearing 327 is disposed between the gear 324 and the extension of the rotating shaft 321. Key 328 is used to connect gear 324 and coupling socket 322. The first shaft retainer 329 is engaged with the rotating shaft 321 and is disposed between the first deep groove bearing 327 and the extension of the rotating shaft 321. The gas joint 323 adopts a KSH06-M5 type quick joint, the first deep groove bearing 327 adopts a GB/T276 6204 type deep groove ball bearing, the gear 324 adopts a KHK _ US-SSG 2-28/J25 type gear grinding spur gear, the bearing 325 adopts a GB/T276 6305 deep groove ball bearing, and the first shaft retainer 329 adopts a GB894.1 20 shaft retainer ring.

As shown in fig. 4, the positioning module 33 includes: a positioning seat 331 matching with the connecting seat 322 and having a gas passage therein; and the positioning pin 332 is connected with the positioning seat 331 and is provided with an opening for releasing gas, and the positioning pin 332 is matched with the weldment.

Another embodiment of the positioning module 33 is shown in fig. 5, except that a spring 333 and a screw 334 for fixing the spring 333 are provided at one end of the positioning pin 332.

Fig. 7-8 are schematic views of the position limiting unit 64, including: the top pin 641, and a first connection shaft 642 and a second connection shaft 643 which are matched with the top pin 641, wherein the first connection shaft 642 is connected with the base 61, the second connection shaft 643 is connected with the base connection plate 62, and one end of the top pin 641 is provided with a hand wheel 644 for adjusting the distance between the top pin 641 and the weldment so as to press the weldment. A third connecting shaft 645 and a fourth connecting shaft 646 are provided between the first connecting shaft 642 and the second connecting shaft 643, respectively, a second deep groove bearing 647 is provided between the first connecting shaft 642 and the third connecting shaft 645, and a third deep groove bearing 648 is provided between the third connecting shaft 645 and the knock pin 641. An oilless bushing 649 is provided between the second connecting shaft 643 and the knock pin 641. The fifth connecting shaft 650 is provided between the first connecting shaft 642 and the third connecting shaft 645, and the second shaft retainer 651 is provided between the first connecting shaft 642 and the knock pin 641. The handwheel 644 adopts an HOKW50-10 type handwheel, the second deep groove bearing 647 adopts a GB/T276 61802 bearing, the third deep groove bearing 648 adopts a GB/T276 61804 bearing, the oil-free bush 649 adopts an MPBR25-16 type oil-free bush, the second shaft retainer ring 651 adopts a GB894.115 shaft retainer ring, and the pin sleeve 652 is sleeved on the top pin 641.

Fig. 10 to 11 are schematic diagrams of the housing module 8, the housing module 8 is located around the transmission module 1 and is used for protecting the transmission module 1 and introducing shielding gas, the housing module 8 comprises a cylindrical housing 81 and a gas inlet and outlet assembly 82, the cylindrical housing 81 is connected with the weldment fixing module 3, one end of the cylindrical housing is provided with an inner groove, and an opening is formed in the inner groove; the schematic diagram of the air inlet and outlet assembly 82 is as shown in fig. 12, and includes an air inlet joint 821, an air outlet joint 822 and six air outlet joints 823, the air outlet joint 822 matches with an opening on the cylindrical housing 81, the air outlet joint 823 is connected with the weldment fixing module 3 through an air passage, and the cylindrical housing 81 is provided with a window 83 for maintenance. The inlet joint 821 adopts a KSH10-02S type air pipe joint, and the outlet joint 823 adopts a KSH10-02S type air pipe joint.

Fig. 6 is a schematic view of the slide rail module 5, and the slide rail module 5 includes a rail 51, a slider 52, an L-shaped block 53 and a handle 54, the rail 51 is connected to the guide shaft 4, the slider 52 is movably connected to the rail 51 and connected to the weldment pressing module 6, the L-shaped block 53 is connected to the rail 51, the handle 54 is connected to the L-shaped block 53, and the slide rail module 5 further includes a limit block 55 disposed at one end of the rail 51 for preventing the slider 52 from sliding out of the rail 51. The handle 54 is made of the HK2001A-PHK20 of Xiong Ke.

In actual use, the bottom of the cylindrical housing 81 of the auxiliary device is mounted on a turntable of the positioner and locked, the argon supply device is connected with the air inlet joint 821, and the top plate 9 is connected with a base of the positioner. The positioning module 33 is mounted to the gear module 32. Six nozzles to be welded are mounted on the positioning pin 332 of the positioning unit 33, and an operator pulls the handle 54 on the slide rail module 5 to drive the weldment pressing module 6 connected with the slide block 52 to move downwards along the direction of the rail 51 until the limiting unit 64 abuts against the nozzles to be welded. The hand wheels 644 on the six limiting units 64 are adjusted to make the top pins 641 tightly contact with the nozzles to be welded, so as to complete the fixation. The motor 11 is started to rotate the driving gear 13, and the driving gear 13 is engaged with the gear 324 of the gear unit 32, and the gear 324 is connected to the connecting socket 322 by the key 328, so that the connecting socket 322 starts to rotate, and the positioning unit 33 mounted on the connecting socket 322 and fixing the nozzle to be welded also starts to rotate. Argon is input into the air inlet joint 821 through the air transmission device, and the argon sequentially passes through the air inlet joint 821, the air exhaust 822, the air outlet joint 823, an air pipe for connecting the air outlet joint 823 with the gear unit 32, the air joint 323, the rotating shaft 321, the connecting seat 322, the positioning seat 331 and the positioning pin 332 to reach the periphery of the workpiece. The welding auxiliary device is moved to a welding station to weld a first nozzle, a welding gun does not need to move due to the rotation of the nozzle, and after the first nozzle is welded, the electric control positioner rotates for 60 degrees to move a next nozzle to the welding station to weld, so that the welding of six nozzles is repeatedly completed.

Example 2

Compared to embodiment 1, this embodiment further comprises a gear lubrication module 7.

As shown in fig. 9, the gear lubrication module 7 is disposed in the fixing base 2, a cover plate for adding a lubricating liquid is disposed on the upper surface of the fixing base 2, the gear lubrication module 7 includes a nozzle 71, a supporting shaft 72, and a lubricating gear 73 engaged with the supporting shaft 72, the nozzle 71 is connected to one end of the supporting shaft 72, and the other end of the supporting shaft 72 is connected to the adapter plate 31. The oil nozzle 71 adopts a GPAS6A type oil nozzle, the third shaft check ring 74 adopts a 07V0078-U AF0 type shaft check ring, and the lubricating gear 73 adopts a GEARH2.0-18-20-A-12 type felt gear.

During maintenance, the cover plate on the fixed seat 331 is opened, lubricating oil is added into the oil nozzle 71, the lubricating oil wets the lubricating gear 73, and the lubricating gear 73 is meshed with the gear 324 of the gear unit 32, so that the transmission gear 13 is lubricated.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A nozzle laser welding assistance device, comprising:

the transmission module (1) is used for driving the weldment to rotate through gear engagement;

the fixing seat (2) is provided with a through hole;

the weldment fixing module (3) is arranged in the through hole of the fixing seat (2) and connected with the transmission module (1), and the weldment fixing module (3) is used for fixing a weldment at a preset position;

the guide shaft (4) is connected with the fixed seat (2);

the sliding rail module (5) is arranged on the guide shaft (4);

and the weldment pressing module (6) is connected with the sliding rail module (5) and used for moving along the direction of the guide shaft (4) so as to press the weldment.

2. A nozzle laser welding assistance device according to claim 1, wherein said weldment fixing module (3) comprises an adapter plate (31), one or more gear units (32) and one or more positioning units (33) connected to said adapter plate (31) and to said fixing seat (2), respectively, said adapter plate (31) being connected to said fixing seat (2), said gear units (32) comprising:

the rotating shaft (321) is connected with the adapter plate (31), one end of the rotating shaft is provided with a connecting seat (322), the connecting seat (322) is provided with an opening for releasing gas and a groove for installing the positioning unit (33), and the other end of the rotating shaft (321) is provided with a gas joint (323);

a gear (324) engaged and connected with the rotating shaft (321), the gear (324) being connected with the transmission module (1);

a bearing (325) which is matched with the rotating shaft (321) and is connected with the fixed seat (2),

the positioning unit (33) comprises:

the positioning seat (331) is matched with the connecting seat (322), and a gas channel is arranged in the positioning seat;

and the positioning pin (332) is connected with the positioning seat (331) and is provided with an opening for releasing gas, and the positioning pin (332) is matched with a weldment.

3. The nozzle laser welding auxiliary device according to claim 2, characterized by further comprising a gear lubricating module (7) arranged in the fixed seat (2), wherein a cover plate for adding lubricating liquid is arranged on the upper surface of the fixed seat (2), the gear lubricating module (7) comprises an oil nozzle (71), a supporting shaft (72) and a lubricating gear (73) matched with the supporting shaft (72), the oil nozzle (71) is connected with one end of the supporting shaft (72), and the other end of the supporting shaft (72) is connected with the adapter plate (31).

4. The nozzle laser welding auxiliary device according to claim 1, wherein the weldment pressing module (6) comprises a base (61) and a base connecting plate (62) which are respectively connected with the slide rail module (5), a connecting plate shaft sleeve (63) which is respectively connected with the base (61) and the base connecting plate (62), and one or more limiting units (64), the base (61) and the base connecting plate (62) are respectively provided with a through hole and are matched with the guide shaft (4), and the connecting plate shaft sleeve (63), the base (61) and the base connecting plate (62) form a column; the limiting unit (64) comprises a top pin (641) and a first connecting shaft (642) and a second connecting shaft (643) which are matched with the top pin (641), the first connecting shaft (642) is connected with the base (61), the second connecting shaft (643) is connected with the base connecting plate (62), and one end of the top pin (641) is provided with a hand wheel (644) used for adjusting the distance between the top pin (641) and a weldment so as to press the weldment.

5. The nozzle laser welding auxiliary device according to claim 1, wherein the transmission module (1) comprises a motor (11), a speed reducer (12) and a transmission gear (13), the motor (11) is in power connection with the speed reducer (12), the speed reducer (12) is in power connection with the transmission gear (13), and the transmission gear (13) is located in the fixed seat (2) and is connected with the weldment fixing module (3).

6. A nozzle laser welding auxiliary device according to claim 1, characterized by further comprising a housing module (8) located around the transmission module (1) for protecting the transmission module (1) and introducing a shielding gas, wherein the housing module (8) comprises a cylindrical shell (81) and an air inlet and outlet assembly (82), the cylindrical shell (81) is connected with the weldment fixing module (3), one end of the cylindrical shell is provided with an inner groove, and an opening is formed in the inner groove; the air inlet and outlet assembly (82) comprises an air inlet joint (821), an air exhaust (822) and one or more air outlet joints (823), the air exhaust (822) is matched with an opening hole in the cylindrical shell (81), and the air outlet joints (823) are connected with the weldment fixing module (3) through air passages.

7. A nozzle laser welding assistance device according to claim 6, characterized in that the cylindrical housing (81) is provided with a window (83) for service.

8. A nozzle laser welding assistance device according to claim 1, characterized in that said rail module (5) comprises a rail (51), a slider (52), an L-shaped block (53) and a handle (54), said rail (51) is connected to said guiding axle (4), said slider (52) is movably connected to said rail (51) and to said weldment pressing module (6), said L-shaped block (53) is connected to said rail (51), said handle (54) is connected to said L-shaped block (53).

9. A nozzle laser welding aid according to claim 8, characterized in that the slide rail module (5) further comprises a stopper (55) disposed at one end of the rail (51) for preventing the slide block (52) from sliding out of the rail (51).

10. A nozzle laser welding aid as claimed in claim 1, characterized in that the guide shaft (4) is provided with a head plate (9) at the end remote from the holder (2).

Images