Dust hood and welding device

Abstract

The utility model provides a dust hood and welding device, dust hood includes hard cover body, and hard cover body has opened the air outlet, still includes flexible cover body, and flexible cover body and hard cover body bottom fixed, flexible cover body has the airflow gathering board from the inner wall to the center extension, and the passageway that airflow gathering board surrounds and communicates with the air outlet, airflow gathering board is higher than the flexible cover body bottom edge. The utility model discloses a flexible cover body of soft connection makes the transition between rigid hard cover body and the battery of easy scratch, makes the welding plane upper space closed, prevents hard cover body and mechanism or battery rigid collision, prevents the clearance of hard cover body's avoidance from guaranteeing the negative pressure wind speed, thereby leads to the splash and dust produced in the welding process to be unable effectively sucked upwards. Airflow gathering board can make high -speed airflow flow close to the welding surface, can take away metal vapor, dust and other pollutants quickly.

Description

Technical Field

[0001] This utility model relates to the field of welding dust removal technology, specifically a dust removal hood and welding device. Background Technology

[0002] In lithium-ion battery production, the cover plate welding process is particularly vulnerable to environmental factors due to its long welding path, high welding speed requirements, and thin-walled components. Metal vapors and oxides generated during welding, if not promptly removed, can cause defects such as spattering if they fall onto or come into contact with the weld joint. Therefore, dust removal is crucial for welding quality at this station. The dust removal design of the welding platform must effectively remove all external factors affecting welding in a short time. Conventional dust removal designs involve installing metal dust hoods around the welding needles. However, to prevent interference from moving welding equipment, a safety distance must be maintained. This results in spatter and dust generated during welding not being effectively drawn upwards. Furthermore, while the wind speed at the dust removal pipeline port exceeds the design speed by 15 m / min, the wind speed at the hood port is significantly lower. This indicates that the negative pressure in the main pipeline is dissipated, resulting in insufficient wind speed at the welding point. Utility Model Content

[0003] The technical problem to be solved by this utility model is how to improve the dust removal effect during the welding process.

[0004] This utility model solves the above-mentioned technical problems through the following technical means:

[0005] The dust collector includes a rigid cover with an air extraction port and a flexible cover fixed to the bottom of the rigid cover. An airflow converging plate extends from the inner wall of the flexible cover towards its center, and the channel enclosed by the airflow converging plate communicates with the air extraction port. The airflow converging plate is higher than the bottom edge of the flexible cover. This invention uses the flexible cover with a flexible connection to transition between the rigid cover and the easily scratched battery, thus sealing the space above the welding surface. This prevents rigid collisions between the rigid cover and the mechanism or battery, and also prevents the spatter and dust generated during welding from being unable to be effectively drawn upwards due to insufficient negative pressure airflow caused by gaps in the rigid cover. The airflow converging plate allows high-speed airflow to flow close to the welding surface, quickly carrying away metal vapor, dust, and other contaminants.

[0006] Furthermore, the flexible cover includes a corrugated tube, with a fixing plate extending from the top of the corrugated tube towards the center, and the fixing plate is fixed to the bottom opening of the rigid cover.

[0007] Furthermore, the bottom opening of the bellows tapers inward.

[0008] Furthermore, the bottom opening of the rigid cover is rectangular.

[0009] Furthermore, the corrugated pipe has a rectangular cross-section, and the vertical projection of the welding surface is located within the vertical projection range of the bottom opening of the corrugated pipe.

[0010] Furthermore, there are two airflow converging plates, which extend inward from the width side of the inner wall of the corrugated pipe.

[0011] Furthermore, both sides of the airflow converging plate are connected to the inner wall of the corrugated pipe along its length.

[0012] Furthermore, the airflow converging plate is horizontal or inclined upward from the inner wall of the flexible cover to the center.

[0013] Furthermore, the lowest position of the airflow converging plate is 2-3 mm above the welding surface.

[0014] This utility model also provides a welding device, including the dust cover described above.

[0015] The advantages of this utility model are:

[0016] This invention uses a flexible cover with a soft connection to transition between a rigid hard cover and a easily scratched battery, thus sealing the space above the welding surface. This prevents rigid collisions between the hard cover and the mechanism or battery, and also prevents spatter and dust generated during welding from being unable to be effectively drawn upwards due to insufficient negative pressure airflow caused by gaps in the hard cover. The airflow converging plate allows high-speed airflow to flow close to the welding surface, quickly carrying away metal vapor, dust, and other contaminants.

[0017] In this invention, by increasing the size of the soft cover so that its two ends are outside the welding surface, the negative pressure relief port is always kept below the welding plane. Therefore, the airflow drawn away by the negative pressure always moves from bottom to top. Under the action of the airflow gathering plate, the airflow flows at high speed along the welding surface, which can effectively remove metal vapor, dust and other pollutants. And it can only move upward with the airflow, thereby avoiding contact with the newly welded surface and the occurrence of poor weld quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the dust removal hood and the assembly of the dust removal hood and the welding device in Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the dust removal hood and the welding device after assembly in Embodiment 1 of this utility model;

[0020] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of A in the middle;

[0021] Figure 4This is a schematic diagram of the welding device in Embodiment 2 of this utility model;

[0022] Figure 5 for Figure 4 A slanted bottom view;

[0023] Figure 6 For Figure 5 The direction of airflow is shown from a visual perspective.

[0024] 1- Rigid cover; 11- Air extraction port; 2- Flexible cover; 21- Corrugated pipe; 22- Mounting plate; 23- Airflow gathering plate; 3- Gate; 4- Limiting block; 5- Cylinder; 6- Cylinder bracket; 7- Welder; 8- Square battery. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Cover plate: A component at the end of a lithium battery, made of aluminum.

[0027] Peripheral welding process: A production process in lithium battery manufacturing, mainly involving welding the cover plate and the edge battery casing (aluminum) into a whole. The cuboid edge is continuously welded to complete one cycle.

[0028] Dust collector: An industrial device that generates negative pressure to remove dust and impurities from a target location through adsorption via dust collection pipes.

[0029] Explosion point: During the welding process, foreign objects (dust, impurities, etc.) fall into the molten metal being welded. The temperature in this area changes significantly, and the solidification of the molten metal will create a pit, which looks like an explosion point under a microscope.

[0030] Example 1

[0031] This embodiment describes a dust removal hood, such as Figure 1As shown, the dust cover consists of two parts: a rigid cover 1 and a flexible cover 2. The rigid cover 1 can be made of metal welding and is heat-resistant. Since the dust cover in this embodiment is used for welding battery cover plates, and the welding path is straight, the top opening of the rigid cover 1 is rectangular or square, and the bottom opening is rectangular, with the top opening smaller than the bottom opening, roughly in the shape of a trumpet, wider at the bottom and narrower at the top. The welding needle of the welding machine 7 passes through the top opening of the rigid cover 1 and is located inside it. The top opening of the rigid cover 1 is fixed to the welding machine 7 by bolts or clips. This fixing structure is existing technology and will not be described in detail. Of course, the top and bottom openings of the rigid cover 1 can also be circular or rectangular. Choosing a rectangle can reduce the volume of the rigid cover 1. The side wall of the rigid cover 1 has an exhaust port 11, which is connected to an air pump through a hose for evacuating air from the welding area. The negative pressure is used to remove impurities such as welding slag and metal vapor, preventing explosions. There can be one or two exhaust ports 11.

[0032] like Figure 2 , Figure 3 As shown, the flexible cover 2 is located below the rigid cover 1 and is fixed to the bottom opening of the rigid cover 1. In this embodiment, the flexible cover 2 must be vertically expandable but not horizontally swaying, so that the bottom opening of the flexible cover 2 does not fail to move during the welding process. Therefore, the main body of the flexible cover 2 in this embodiment is a corrugated pipe 21, but the corrugated pipe 21 should not be too high. Generally, 2 to 3 corrugations are sufficient. This allows for vertical expansion and contraction, but because there are fewer corrugations and the height is smaller, the probability of horizontal swaying can be reduced. To prevent the bottom opening of the flexible cover 2 from prematurely contacting the welding area and affecting its cooling, this embodiment designs the bottom opening of the flexible cover 2 to be slightly larger. A corrugated pipe 21 with a rectangular cross-section can be used, with its bottom opening length greater than the welding surface of the battery. During the welding follow-up process, the long side of the bottom opening of the corrugated pipe 21 contacts the battery welding surface, while the short side remains outside the welding surface, suspended in mid-air. That is, the vertical projection of the welding surface is within the vertical projection range of the bottom opening of the corrugated pipe 21. Even during the lateral movement follow-up process, the short side will not immediately contact the area just welded, thus not affecting the welding quality. Since the size of the corrugated pipe 21 is larger than the bottom opening of the rigid cover 1, a mounting plate 22 extends inward from the top opening of the corrugated pipe 21 for fixation. The mounting plate 22 can be welded or glued to the bottom opening of the rigid cover 1. Figure 6As shown, during dust removal, an excessively large airflow area naturally reduces the flow velocity, which is not conducive to removing impurities such as welding slag from the welding surface. Therefore, in this embodiment, an airflow converging plate 23 extends towards the center at a height of 2-3 mm above the inner side of the bottom opening of the corrugated pipe 21. There are two airflow converging plates 23, which extend horizontally or slightly upward from one side of the short side of the corrugated pipe 21 towards the center. The two sides of the airflow converging plates 23 are connected to the inner wall of the long side of the corrugated pipe 21. In this way, the two airflow converging plates 23 are low in height from the welding surface. During dust removal, under the action of negative pressure, the airflow enters from the suspended position of the short side of the bottom opening of the soft cover 2 and flows along the bottom surface of the airflow converging plate 23. That is, the airflow flows along the welding surface to the airflow channel between the two airflow converging plates 23, and finally enters the rigid shell and is discharged from the exhaust port. In this way, the high-speed airflow acts on the welding surface, which can quickly remove impurities such as welding slag.

[0033] In this embodiment, the soft cover 2 can be made of a corrugated pipe 21 of rubber or metal. If rubber is used, its hardness should be sufficient to allow for lateral movement during welding, and it should not misalign or sway in the left or right direction due to resistance from the welding surface. The corrugated pipe 21 of rubber can be integrally formed with the mounting plate 22 and the airflow converging plate 23. The corrugated pipe 21 of metal is fixed to the mounting plate 22 and the airflow converging plate 23 by welding.

[0034] The flexible cover 2, with its soft connection, transitions between the rigid cover 1 and the easily scratched battery, sealing the space above the welding plane. This prevents the rigid cover 1 from rigidly colliding with the mechanism or battery, and also prevents spatter and dust generated during welding from being unable to be effectively sucked away due to insufficient negative pressure airflow caused by the gaps in the rigid cover 1. In this design, the only negative pressure relief port is always located below the welding plane, so the airflow drawn away by negative pressure always moves from bottom to top. Under the action of the airflow converging plate 23, the airflow flows at high speed along the welding surface, effectively carrying away metal vapor, dust, and other contaminants. The airflow can only move upwards, thus avoiding contact with the newly welded surface and preventing poor weld quality. Compared with conventional dust removal methods, this design avoids the waste of negative pressure in the dust collector, improves dust removal efficiency, reduces welding spatter and other defects, and reduces welding scrap. The dust cover in this embodiment is not only used for dust removal in the welding process around the lithium battery cover, but can also be used in other welding processes where space is required and the negative pressure for dust removal is insufficient.

[0035] Example 2

[0036] This embodiment provides a welding device, such as... Figure 4 , Figure 5As shown, the welding operation for the square battery 8 and the cover plate includes a fixing assembly for fixing the square battery 8 and a dust cover as described in Embodiment 1. The fixing assembly includes a gate 3, a limiting block 4, a cylinder 5, and a cylinder bracket 6. The cylinder 5 is fixed to the operating table via the cylinder bracket 6. The limiting block 4 is fixed to the output end of the cylinder 5. The limiting block 4 is L-shaped and has a limiting step. The gate 3 for fixing the battery includes a limiting hole for the battery to pass through. After the square battery 8 passes through the gate 3, the cylinder 5 is activated to make the limiting block 4 press against the end of the square battery 8. After the square battery 8 is limited to the set position, the cylinder 5 drives the limiting block 4 to retract. In Embodiment 1, the dust cover is fitted over the outside of the welder 7, and the welding needle is located inside the dust cover. The welding nozzle is moved to the welding position by an automatic control program (existing technology), so that the soft cover 2 contacts the welding surface. The dust collector and the welder 7 are then activated to perform welding. Since the weld between the cover plate and the square battery 8 is square, after welding one side, the automatic control program controls the welder 7 to be raised to a certain height, the gantry gate 3 rotates, and the other side to be welded is turned to face upward. At this time, the welder 7 is lowered to the welding surface and welding continues. In this way, welding of all four sides can be completed.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dust collector hood, comprising a rigid hood body, wherein the rigid hood body has an air extraction port; characterized in that, It also includes a flexible cover, which is fixed to the bottom of a rigid cover; the flexible cover has an airflow converging plate extending from its inner wall to the center, and the channel enclosed by the airflow converging plate is connected to the air extraction port; the airflow converging plate is higher than the bottom edge of the flexible cover.

2. The dust collector hood according to claim 1, characterized in that, The flexible cover includes a corrugated pipe with a fixing plate extending from the top of the corrugated pipe toward the center, and the fixing plate is fixed to the bottom opening of the rigid cover.

3. The dust collector hood according to claim 2, characterized in that, The bottom of the bellows tapers inward.

4. The dust collector hood according to claim 2 or 3, characterized in that, The bottom opening of the rigid cover is rectangular.

5. The dust collector hood according to claim 4, characterized in that, The corrugated pipe has a rectangular cross-section, and the vertical projection of the welding surface is located within the vertical projection range of the bottom opening of the corrugated pipe.

6. The dust collector hood according to claim 5, characterized in that, There are two airflow converging plates, which extend inward from the width side of the inner wall of the corrugated pipe.

7. The dust collector hood according to claim 6, characterized in that, The airflow converging plate is connected to the inner wall of the corrugated pipe along its length on both sides.

8. The dust collector hood according to any one of claims 1 to 3, characterized in that, The airflow gathering plate is horizontal or inclined upward from the inner wall of the flexible cover to the center.

9. The dust collector hood according to claim 8, characterized in that, The lowest position of the airflow converging plate is 2-3 mm above the welding surface.

10. A welding apparatus, characterized in that, Includes the dust cover as described in any one of claims 1 to 9.

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