Welding device for polar plate processing

Abstract

The invention relates to the technical field of polar plate machining of electrolytic cells, in particular to a welding device for polar plate machining. Comprising a machining table, a mechanical arm is arranged at the upper end of the machining table, a welding assembly is installed on the mechanical arm, the welding assembly comprises an air cylinder, an installation base is fixed to the telescopic end of the air cylinder, a protection pipe is fixed to the lower end of the installation base, and a welding head is fixed into the protection pipe; a conical sleeve is concentrically and rotationally connected into the conical part, a conical screw rod is concentrically arranged in the conical sleeve, the protection pipe is located on the inner side of the conical screw rod, the outer side of the middle of the conical screw rod is sleeved with a rubber strip, and the rubber strip is spirally coiled to form a conical inner sleeve. According to the device, stepless adjustment of the diameter of a nozzle of the inner sleeve is achieved through the taper sleeve driven by the motor, and the requirements for different welding seam widths and welding areas can be met without manually replacing the nozzle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic cell plate processing, and particularly relates to a welding device for plate processing. BACKGROUND

[0002] In the field of electrolytic water hydrogen production, electrolytic cell plate processing is a core link, involving high-precision welding processes to ensure the sealing and electrical conductivity of the plate. During the welding process, protective gas (such as argon or nitrogen) is used to cover the welding surface to disperse plasma, reduce oxidation, and improve welding quality. Traditional welding devices usually include a processing table, a mechanical arm, and a welding assembly, where the mechanical arm moves through an electrically controlled slide rail with multiple degrees of freedom, and the welding assembly is equipped with a welding head driven by a gas cylinder and a protective gas nozzle. However, the size and shape of the plate weld vary depending on application requirements, for example, when the weld width increases, the coverage of the protective gas needs to be expanded, which requires the nozzle nozzle diameter to be adjustable. At the same time, if the waste gas (such as metal vapor and residual gas) generated during the welding process is not effectively recovered, it will pollute the environment and harm the health of the operators. Therefore, although the existing device can adjust the nozzle diameter and gas flow rate to adapt to different working conditions, its design has significant deficiencies in flexibility, efficiency, and safety.

[0003] The existing welding device faces multiple challenges in adjusting the protective gas nozzle. First, the adjustment of the nozzle nozzle diameter usually relies on mechanical replacement or simple telescopic structure, which is not only cumbersome to operate, but also damages the conical design of the nozzle. The conical nozzle can optimize gas flow, reduce energy loss, and provide stable jet flow due to its smooth inward taper, but when adjusting the nozzle diameter, the traditional method cannot maintain a constant taper, causing unpredictable changes in fluid characteristics such as flow shape and separation point. This forces engineers to retest after each adjustment to evaluate gas coverage, outlet flow stability, and plasma dispersion effect, greatly reducing adjustment efficiency. Second, the waste gas recovery system is often independent of the gas injection unit, lacking integrated design, making it easy for waste gas to escape into the surrounding environment, increasing the risk of environmental pollution. In addition, rubber seals or friction components are prone to deformation or wear during dynamic adjustment, further affecting the sealing performance and service life. These defects not only prolong the processing time, but also increase maintenance costs and safety hazards, especially in large-scale production environments.

[0004] Therefore, a welding device needs to be designed that can achieve stepless adjustment of the nozzle diameter while maintaining the constant taper of the nozzle, thereby ensuring the geometric similarity of the protective gas flow pattern, simplifying the parameter prediction process, and improving operational efficiency. SUMMARY

[0005] The main purpose of the present application is to provide a kind of electrode plate processing welding device, which can adjust the size of the protective gas outlet according to the size of the weld of electrode plate, and then can make the protective gas cover the welding surface of electrode plate.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the present application is: A kind of electrode plate processing welding device, including processing table, the upper end of processing table is provided with mechanical arm, mechanical arm is installed with welding assembly, welding assembly includes cylinder, fixed mounting seat is fixed on the telescopic end of cylinder, fixed protective tube is fixed in protective tube, welding head is fixed in the outer side of protective tube, the lower end of mounting seat is fixed with fixed cylinder outside protective tube, the lower part of fixed cylinder is tapered portion, the diameter of the lower end port is less than the diameter of the upper end port, tapered sleeve is rotatably connected in the tapered portion, driving assembly is installed on fixed cylinder, driving assembly is connected with tapered sleeve, tapered screw rod is concentrically arranged in the tapered sleeve, the taper of tapered sleeve and tapered screw rod is equal, protective tube is located in the inside of tapered screw rod, the upper end of tapered screw rod is fixedly connected with the inner wall of fixed cylinder above tapered portion, the lower end of tapered screw rod is fixedly connected with the lower end of fixed cylinder, rubber strip is sleeved on the outside of the middle part of tapered screw rod, rubber strip is spirally arranged and forms tapered inner sleeve, the outer edge of inner sleeve is in sealing contact with the inner edge of tapered sleeve, the upper end of fixed cylinder is fixedly connected with inlet pipe, a plurality of rollers are rotatably arranged on the inner wall of tapered portion of fixed cylinder, the rollers on the outside of inner sleeve extrude the outer wall of inner sleeve, and the rotation direction of rollers is perpendicular to the rotation direction of tapered sleeve.

[0007] Specifically, the mechanical arm includes two first electric control sliding rails fixed above the processing table, the sliding parts of the two first electric control sliding rails are fixedly connected with the second electric control sliding rail, and the cylinder is fixed on the sliding part of the second electric control sliding rail.

[0008] Specifically, the lower end of the mounting seat outside the fixed cylinder is fixed with an outer cylinder, the outer cylinder is fixedly connected with an air extraction pipe, and the air extraction pipe is communicated with an air extractor.

[0009] Specifically, the driving assembly includes a motor fixed on the fixed cylinder, a gear is fixed concentrically on the output shaft of the motor, a gear ring is fixed concentrically on the upper end of the tapered sleeve, and the gear is engaged with the gear ring.

[0010] Specifically, the upper end of the tapered screw rod is fixed with a first fixed plate, the first fixed plate is fixedly connected with the inner wall of the fixed cylinder above the tapered portion, the lower end of the tapered screw rod is fixed with a second fixed plate, and the second fixed plate is fixed on the lower end of the tapered portion.

[0011] Specifically, the hollow steel wire sleeve is fixed in the rubber strip, the sliding sleeve is fixed in the hollow steel wire sleeve, and the tapered screw rod penetrates the sliding sleeve.

[0012] Specifically, the hollow steel wire sleeve is made of a plurality of steel wire ropes by interlacing and twisting, and a cavity is formed at the center, and the sliding sleeve is a flexible graphite sleeve.

[0013] Compared with the prior art, the present application has the following advantages: 1、The device realizes stepless adjustment of the diameter of the inner sleeve nozzle by the motor-driven taper sleeve, without the need for manual replacement of the nozzle, so as to adapt to the requirements of different weld widths and welding areas. During the adjustment process, the fixed taper of the tapered screw rod ensures that the taper of the inner sleeve is always unchanged, thereby maintaining the geometric similarity of the protective gas flow characteristics, simplifying the parameter prediction process, and significantly improving the adaptability and adjustment efficiency for different welding conditions.

[0014] 2、The design of the hollow steel sleeve inside the rubber strip greatly improves its structural strength and deformation resistance, avoids local bulging or sealing failure during diameter adjustment, and ensures that the outer wall of the inner sleeve and the inner wall of the taper sleeve are always tightly sealed and fitted; the flexible graphite sleeve is used for the sliding sleeve, which effectively reduces the friction of the rubber strip when moving along the tapered screw rod, in combination with the rollers, to ensure smooth and smooth adjustment process, prolong the service life of the device and reduce the maintenance requirements.

[0015] 3、The integration of the outer cylinder and the exhaust pipe with the protective gas injection unit can remove the welding waste gas and the escaped protective gas in real time during the welding process, preventing environmental pollution and health risks to operators. This design seamlessly connects the gas injection and recovery functions, avoids the low efficiency problem caused by the separation of the waste gas treatment unit in traditional systems, and improves the safety and sustainability of the overall processing environment.

[0016] 4、The entire adjustment process is realized by electric control in combination with the multi-degree-of-freedom movement of the mechanical arm, which greatly simplifies the welding head positioning and parameter setting process and improves the processing efficiency.

[0017] 5、Constant taper and geometric similarity ensure that the protective gas can maintain high kinetic energy output, low energy loss and stable jet characteristics after the diameter of the nozzle changes, optimize the plasma dispersion effect and welding quality, and reduce the dependence of engineers on repeated experimental verification. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the device.

[0019] Figure 2 is a schematic view of the inner sleeve in the tapered portion.

[0020] Figure 3 is a sectional view of the fixed cylinder.

[0021] Figure 4 is a sectional view of the inner sleeve.

[0022] Figure 5 is Figure 4 is an enlarged view of area A.

[0023] Figure 6This is a schematic diagram of the tapered helical rod inside the tapered section.

[0024] Figure 7 This is a schematic diagram of the rollers on the inner wall of the tapered sleeve.

[0025] Figure 8 This is a schematic diagram of a tapered screw.

[0026] The components in the attached diagram are named as follows: 1. Machining table; 2. First electrically controlled slide rail; 3. Second electrically controlled slide rail; 4. Cylinder; 5. Mounting base; 6. Welding head; 7. Protective tube; 8. Fixing cylinder; 9. Air inlet pipe; 10. Conical sleeve; 11. Roller; 12. Gear ring; 13. Gear; 14. Motor; 15. Conical helical rod; 16. First fixing plate; 17. Second fixing plate; 18. Rubber strip; 19. Hollow steel wire sleeve; 20. Sliding sleeve; 21. Outer cylinder; 22. Air extraction pipe. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] like Figures 1-8 As shown, a welding device for electrode processing includes a processing table 1, a robotic arm is provided on the upper end of the processing table 1, and welding components are installed on the robotic arm.

[0029] The robotic arm includes two first electrically controlled slide rails 2 fixed above the processing table 1, and the sliding parts of the two first electrically controlled slide rails 2 are fixedly connected to the second electrically controlled slide rails 3.

[0030] The welding assembly includes a cylinder 4, which is fixed to the sliding part of the second electrically controlled slide rail 3. A mounting base 5 is fixed to the telescopic end of the cylinder 4, and a protective tube 7 is fixed to the lower end of the mounting base 5. A welding head 6 is fixed inside the protective tube 7.

[0031] A fixing cylinder 8 is fixed to the lower end of the mounting base 5 on the outside of the protective tube 7. An air inlet pipe 9 is fixedly connected to the upper end of the fixing cylinder 8. The lower part of the fixing cylinder 8 is a tapered part, and the diameter of the lower port of the tapered part is smaller than the diameter of the upper port.

[0032] An outer cylinder 21 is fixed to the lower end of the mounting base 5 on the outer side of the fixed cylinder 8. An exhaust pipe 22 is fixedly connected to the outer cylinder 21 and is connected to the exhaust fan.

[0033] A concentric rotating cone sleeve 10 is connected inside the cone-shaped part, and a drive assembly is installed on the fixed cylinder 8. The drive assembly is connected to the cone sleeve 10.

[0034] The drive assembly includes a motor 14 fixed on a fixed cylinder 8, a gear 13 concentrically fixed on the output shaft of the motor 14, and a gear ring 12 concentrically fixed on the upper end of the tapered sleeve 10, with the gear 13 meshing with the gear ring 12.

[0035] A concentric tapered helical rod 15 is arranged inside the tapered sleeve 10. The tapered sleeve 10 and the tapered helical rod 15 have the same taper. The protective tube 7 is located inside the tapered helical rod 15. The upper end of the tapered helical rod 15 is fixedly connected to the inner wall of the fixed cylinder 8 above the tapered part, and the lower end of the tapered helical rod 15 is fixedly connected to the lower end of the fixed cylinder 8. Specifically, a first fixing plate 16 is fixed to the upper end of the tapered helical rod 15, and the first fixing plate 16 is fixedly connected to the inner wall of the fixed cylinder 8 above the tapered part. A second fixing plate 17 is fixed to the lower end of the tapered helical rod 15, and the second fixing plate 17 is fixed to the lower end of the tapered part.

[0036] A rubber strip 18 is fitted around the outer side of the middle of the conical helical rod 15. The rubber strip 18 is spirally coiled to form a conical inner sleeve, and the outer edge of the inner sleeve is in sealed contact with the inner edge of the conical sleeve 10. Specifically, a hollow steel wire sleeve 19 is fixed inside the rubber strip 18, and a sliding sleeve 20 is fixed inside the hollow steel wire sleeve 19. The conical helical rod 15 passes through the sliding sleeve 20. The hollow steel wire sleeve 19 is made of multiple strands of steel wire rope through interlacing and has a cavity in the center. The sliding sleeve 20 is a flexible graphite sleeve.

[0037] By incorporating a hollow steel wire sleeve 19, the structural strength of the rubber strip 18 can be improved. After the rubber strip 18 is spirally coiled and forms a conical inner sleeve, it ensures that the outer wall of the inner sleeve is tightly sealed to the inner wall of the conical sleeve 10. The sliding sleeve 20 is a flexible graphite sleeve, which reduces the friction between the rubber strip 18 and the conical spiral rod 15 when the rubber strip 18 moves along the conical spiral trajectory of the conical spiral rod 15.

[0038] Multiple rollers 11 are evenly distributed and rotated around the inner wall of the conical part of the fixed cylinder 8. The rollers 11 on the outer side of the inner sleeve press against the outer wall of the inner sleeve, and the rotation direction of the rollers 11 is perpendicular to the rotation direction of the conical sleeve 10.

[0039] In use, the electrode plate is placed on the processing table 1 and fixed by the fixing fixture. The welding head 6 can move freely and weld the electrode plate by means of the first electrically controlled slide rail 2, the second electrically controlled slide rail 3 and the cylinder 4.

[0040] During the welding process, the protective gas is injected into the fixed cylinder 8 through the gas inlet pipe 9, and the protective gas is sprayed out from the lower port of the inner sleeve, so that the protective gas is continuously sprayed onto the welding surface, thereby improving the welding effect.

[0041] Welding processes generate welding fumes, and after welding, the protective gas emitted also dissipates into the surrounding area. If these fumes are not collected and treated, they will cause environmental pollution and adversely affect the health of workers. Therefore, during welding, an exhaust fan is activated to draw the fumes away through the outer cylinder 21 and the extraction pipe 22.

[0042] During welding, a conical nozzle is generally used to spray shielding gas. This shape is designed to optimize kinetic energy output. The inner wall of the conical nozzle outlet is smooth and the diameter gradually narrows. As the diameter gradually decreases, the shielding gas can flow well against the inner wall of the conical nozzle, resulting in less energy loss and achieving a larger outlet velocity and stability. It is the best choice for dense jets.

[0043] Under different welding processing requirements, the welding area increases when the weld width is larger. In order to ensure that the ejected protective gas can cover a larger welding surface and ensure the dispersal effect of plasma, the nozzle diameter of the conical nozzle is increased to adapt to a larger welding surface.

[0044] Furthermore, due to differences in welding materials and weld shapes, the required power density and welding speed also vary. Therefore, the outlet velocity of the shielding gas also needs to be adjusted accordingly. When adjusting the nozzle diameter and shielding gas outlet velocity, it is generally necessary to adjust the nozzle diameter first.

[0045] The nozzle diameter can be adjusted by adjusting the diameter of the lower port of the inner sleeve. During the specific adjustment, the motor 14 rotates in the forward direction, which drives the gear 13 to rotate. The gear 13 drives the gear ring 12 to rotate, which drives the conical sleeve 10 to rotate. The conical sleeve 10 drives multiple rollers 11 to rotate together around the axis of the fixed cylinder 8. Since the rollers 11 on the outer side of the inner sleeve are in contact with the outer wall of the inner sleeve, and the rotation direction of the rollers 11 is perpendicular to the rotation direction of the fixed cylinder 8, the multiple rollers 11 in contact with the inner sleeve can drive the rubber strip 18 to rotate around the axis of the fixed cylinder 8 under the action of friction. Since the conical spiral rod 15 is fixed, the rubber strip 18 will slide on the conical spiral rod 15 during the rotation around the axis of the fixed cylinder 8. During the spiral upward movement of the rubber strip 18, the rubber strip 18 as a whole will move upward relative to the conical sleeve 10. During the upward movement of the rubber strip 18 relative to the conical sleeve 10, the rollers 11 in contact with the rubber strip 18 can rotate, thus reducing the friction of the rubber strip 18 moving upward relative to the conical sleeve 10. That is, the rubber strip 18 will move upward spirally along the conical spiral rod 15, thereby increasing the diameter of the lower end of the inner sleeve and thus increasing the nozzle diameter. Conversely, by controlling the motor 14 to reverse, the nozzle diameter can be reduced.

[0046] During the adjustment of the nozzle diameter, the sliding sleeve 20 is set to reduce the friction between the conical spiral rod 15 and the rubber strip 18. The hollow steel wire sleeve 19 can improve the structural strength of the rubber strip 18 and prevent the rubber strip 18 from bulging outward relative to the conical spiral rod 15 at a certain position when the rubber strip 18 is pushed to move outside the conical spiral rod 15 by multiple rollers 11. This ensures that the rubber strip 18 can move more smoothly outside the conical spiral rod 15.

[0047] Once the nozzle diameter is determined, the outlet flow rate of the protective gas can be adjusted by changing the valve opening of the protective gas.

[0048] During the process of adjusting the nozzle diameter in this device, the conical sleeve 10 is driven to rotate by the motor 14, and the roller 11 pushes the conical inner sleeve formed by the rubber strip 18 to slide along the conical spiral rod 15, thereby increasing or decreasing the diameter of the lower port of the inner sleeve.

[0049] Regardless of the diameter of the lower port of the inner sleeve, the taper of the inner sleeve remains constant due to the fixed taper of the conical helical rod 15. With the taper constant, changes in the diameter of the lower port of the inner sleeve result in a high degree of geometric similarity in the flow patterns of the protective gas within it (including streamline shape, separation point, and other key fluid characteristics). This characteristic allows engineers to accurately predict nozzle performance (such as gas coverage, outlet velocity stability, and plasma dispersal effect) for other diameters of the lower port of the inner sleeve based on experimental data from a single lower port size (e.g., the initial test nozzle diameter), thereby significantly improving the efficiency of adjusting subsequent parameters (such as nozzle diameter and protective gas valve opening).

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for processing polar plates, comprising a processing table (1) provided with a mechanical arm at its upper end, the mechanical arm being provided with a welding assembly, characterized in that, The welding assembly comprises a cylinder (4), a mounting seat (5) fixed on the telescopic end of the cylinder (4), a protection pipe (7) fixed on the lower end of the mounting seat (5), a welding head (6) fixed in the protection pipe (7), a fixed cylinder (8) fixed on the lower end of the mounting seat (5) outside the protection pipe (7), a tapered portion at the lower part of the fixed cylinder (8), the diameter of the lower end of the tapered portion is smaller than that of the upper end, a taper sleeve (10) concentrically and rotatably connected in the tapered portion, a driving assembly mounted on the fixed cylinder (8) and connected with the taper sleeve (10), a tapered screw rod (15) concentrically arranged in the taper sleeve (10), the taper of the taper sleeve (10) is equal to that of the tapered screw rod (15), the protection pipe (7) is located inside the tapered screw rod (15), the upper end of the tapered screw rod (15) is fixedly connected with the inner wall of the fixed cylinder (8) above the tapered portion, the lower end of the tapered screw rod (15) is fixedly connected with the lower end of the fixed cylinder (8), a rubber strip (18) is sleeved on the outer side of the middle part of the tapered screw rod (15), the rubber strip (18) is spirally arranged and forms a tapered inner sleeve, the outer edge of the inner sleeve is in sealing contact with the inner edge of the taper sleeve (10), an air inlet pipe (9) is fixedly and communicatively connected with the upper end of the fixed cylinder (8), a plurality of rollers (11) are rotatably arranged on the inner wall of the tapered portion of the fixed cylinder (8) in a circumferential direction, the rollers (11) outside the inner sleeve extrude the outer wall of the inner sleeve, and the rotation direction of the rollers (11) is perpendicular to the rotation direction of the taper sleeve (10).

2. The welding device for processing a polar plate according to claim 1, wherein The mechanical arm comprises two first electric control sliding rails (2) fixed above a machining table (1), the sliding parts of the two first electric control sliding rails (2) are fixedly connected with a second electric control sliding rail (3), and a cylinder (4) is fixed on the sliding part of the second electric control sliding rail (3).

3. The welding device for processing the pole plate according to claim 1, characterized in that, The lower end of the mounting seat (5) outside the fixed cylinder (8) is fixedly connected with an outer cylinder (21), an air extraction pipe (22) is fixedly and communicatively connected with the outer cylinder (21), and the air extraction pipe (22) is in communication with an air extractor.

4. The welding device for processing the pole plate according to claim 1, characterized in that, The driving assembly comprises a motor (14) fixed on the fixed cylinder (8), a gear (13) fixed concentrically on the output shaft of the motor (14), and a tooth ring (12) fixed concentrically on the upper end of the taper sleeve (10), wherein the gear (13) is in meshing connection with the tooth ring (12).

5. The welding apparatus for processing a polar plate according to claim 1, wherein The upper end of the tapered screw rod (15) is fixedly connected with a first fixed plate (16), the first fixed plate (16) is fixedly connected with the inner wall of the fixed cylinder (8) above the tapered portion, the lower end of the tapered screw rod (15) is fixedly connected with a second fixed plate (17), and the second fixed plate (17) is fixed on the lower end of the tapered portion.

6. The welding device for processing a polar plate according to claim 1, wherein A hollow steel wire sleeve (19) and a sliding sleeve (20) are fixed in the rubber strip (18), and the tapered screw rod (15) penetrates through the sliding sleeve (20).

7. The welding apparatus for processing a polar plate according to claim 6, wherein The hollow steel wire sleeve (19) is made of a plurality of steel wire ropes through interactive twisting and has a cavity at the center, and the sliding sleeve (20) is a flexible graphite sleeve.

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