Temperature change resistant cast welding device and assembling method thereof

Abstract

The invention provides a temperature change resistant cast welding device and an assembling method thereof. The device comprises a cast-weld bottom die and a cast-weld turnover plate, a cast-weld cavity is formed in the top face of the cast-weld bottom die, the cast-weld turnover plate is provided with a positioning groove used for being matched with a battery groove of a storage battery to be cast-welded for positioning, a plurality of limiting nails are arranged on the cast-weld turnover plate, the lower ends of the limiting nails penetrate out of the bottom face of the cast-weld turnover plate, and the limiting nails are arranged in the positioning groove. The cast-weld bottom die is provided with a positioning hole for the limiting nail to stretch in and be positioned, and the cross section of the matching part of the limiting nail and the positioning hole is oval. Through the design of the oval cross section, fit clearances in two different directions are created in the radial direction, accurate positioning can still be achieved after the hole diameter of the positioning hole is increased due to high temperature, and jamming generated when the limiting nail is matched with the positioning hole is avoided.

Description

Technical Field

[0001] This invention belongs to the field of lead-acid battery technology, specifically relating to a temperature-resistant variable casting welding device and its assembly method. Background Technology

[0002] In the production process of lead-acid batteries, lead welding is required on the tabs to form a busbar, thereby providing a stable current flow path for charging and discharging the lead-acid battery.

[0003] In existing lead welding of electrode tabs, the electrode tabs need to be inserted vertically into the molten lead of the casting mold. Therefore, before the electrode tabs enter the molten lead, positioning components are needed to position the casting mold and the casting transfer plate that carries the battery to prevent the casting transfer plate from tilting and causing the electrode tab angle to deviate.

[0004] For example, the utility model with authorization announcement number CN220388493U discloses a battery busbar welding height adjustable device, wherein a limit pin is welded to the lower surface of the threaded rod, and a through hole is opened on the upper surface of the casting and welding mold at the position corresponding to the limit pin. The outer surface of the limit pin is inserted and slidably connected to the through hole on the upper surface of the casting and welding mold. Through the cooperation between the limit pin and the through hole of the welding mold, the position of the threaded rod is prevented from changing when the threaded rod rotates.

[0005] For example, utility model patent CN222608508U discloses a battery casting welding height level calibrable device, including a casting welding base film and a casting welding position plate. The casting welding position plate is provided with a plurality of balance pins and limit pins. When in use, the bottom end of the balance pin abuts against the top surface of the casting welding base film; the lower end of the limit pin protrudes from the bottom surface of the casting welding position plate, and the casting welding base film is provided with positioning holes for the limit pins to extend into and be positioned. In this application, the limit pins on the casting welding position plate extend into the positioning holes on the casting welding base film. The limit pins only play a horizontal positioning role, while in the vertical direction, positioning is achieved by the balance pins on the casting welding position plate abutting against the top surface of the casting welding base film. This avoids the lead adhesion of conventional limit pins, which can cause deviations in the casting welding height and affect the casting welding quality.

[0006] In the prior art, the cross-section of the part where the limiting pin and the positioning hole mate is circular. When the mold is repeatedly immersed in molten lead at a temperature of 480-500℃, the diameter of the positioning hole increases due to thermal expansion and contraction, resulting in a larger effective gap during alignment. This leads to inaccurate positioning and affects the welding effect.

[0007] Increasing the outer diameter of the locating pin ensures accurate positioning after the locating hole expands at high temperatures, but at lower temperatures, the locating hole does not expand and will get stuck when it engages with the locating pin, or even be unable to be pulled out of the locating hole normally, affecting the welding operation. Summary of the Invention

[0008] To address the aforementioned technical problems in the prior art, this invention provides a temperature-resistant variable casting welding device and its assembly method.

[0009] This invention provides a temperature-resistant variable casting and welding device, including a casting and welding bottom mold and a casting and welding turnover plate. The top surface of the casting and welding bottom mold has a casting and welding cavity. The casting and welding turnover plate has a positioning groove for positioning in conjunction with the battery compartment of the battery to be cast and welded. The casting and welding turnover plate is provided with a plurality of limiting pins. The lower end of the limiting pins protrudes from the bottom surface of the casting and welding turnover plate. The casting and welding bottom mold is provided with a positioning hole for the limiting pins to extend into for positioning. The cross-section of the portion of the limiting pin that mates with the positioning hole is elliptical.

[0010] Furthermore, the major axis of the ellipse is 0.4-0.7 mm smaller than the inner diameter of the positioning hole, and the minor axis is 1.3-2.2 mm smaller than the major axis. The smaller gap between the limiting pin and the positioning hole along the major axis of the ellipse allows for more precise positioning and significantly restricts the movement freedom of the turnover plate in this direction, thus achieving extremely high alignment accuracy and ensuring that the electrode tabs of the electrode plate accurately fall into the corresponding positions in the casting and welding cavity. Conversely, the larger gap between the limiting pin and the positioning hole along the minor axis of the ellipse serves as a guide and tolerance, ensuring that even with minor alignment deviations or thermal deformation during the fit between the positioning hole and the limiting pin at high temperatures, the limiting pin can easily enter the positioning hole, effectively preventing jamming and seizing.

[0011] Furthermore, the inner diameter of the positioning hole is 10mm, the major axis of the ellipse is 9.3~9.6mm, and the minor axis is 7.4~8.0mm. In the prior art, the inner diameter of the positioning hole is generally 10mm. Without changing this dimension, the existing casting and welding mold can be used, only the shape and size of the limiting pin need to be improved, reducing the difficulty and cost of modification, while optimizing the casting and welding effect.

[0012] Furthermore, the limiting pins include four pins located at the four corners of the cast-welded turnover plate. The four limiting pins provide support at the four corners of the cast-welded turnover plate, effectively preventing the plate from tilting to one side, ensuring its parallelism with the cast-welded bottom mold, and the even distribution of the limiting pins provides uniform guiding force, making the mold closing process smoother and resisting shaking.

[0013] Furthermore, the positioning hole is a through hole that penetrates the cast-welded base film. The through hole is easier to process and can effectively reduce manufacturing costs; the through hole facilitates the thorough cleaning of lead slag residue splashed at high temperatures, completely eliminating positioning inaccuracies caused by blockage; the through structure of the through hole also helps to evenly dissipate heat, reducing thermal deformation of the mold caused by local high temperatures, thereby maintaining the accuracy and stability of the positioning system in the long term.

[0014] Furthermore, the lower end of the limiting pin is a pointed tip. The pointed tip serves as a guide, making it easier for the limiting pin to enter the positioning hole and reducing the rigid collision between the bottom surface of the limiting pin and the surface of the cast-welded bottom film.

[0015] Furthermore, the cast-welded turnover plate is provided with mounting holes, and the limiting pin has an enlarged limiting step. The portion of the limiting pin above the limiting step extends into the mounting hole, and the portion extending out of the mounting hole has an external thread section, which is fitted with a locking nut. This structure enables quick assembly and disassembly and precise positioning. The locking nut securely locks the limiting pin, preventing it from loosening during operation and ensuring stable positioning accuracy. Simultaneously, loosening the nut allows for quick replacement of worn limiting pins, greatly simplifying the maintenance process and effectively reducing equipment downtime.

[0016] The present invention also provides an assembly method for a temperature-resistant variable casting welding device. When using the above-mentioned temperature-resistant variable casting welding device, the limiting pin extends into the positioning hole, and the limiting pin is rotated to minimize the gap between the long axis of the limiting pin cross-section and the positioning hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention perfectly resolves the inherent conflict between "precision" and "anti-jamming" in circular limit pin positioning by setting the cross-section of the portion where the limit pin mates with the positioning hole to be elliptical. (1) Improve welding accuracy and quality: The small gap between the elliptical long axis limit pin and the positioning hole can still achieve accurate positioning even after the diameter of the positioning hole increases due to high temperature, which fundamentally solves the casting and welding defects caused by misalignment.

[0018] (2) Ensure smooth production: The large gap between the elliptical short axis limit pin and the positioning hole effectively prevents jamming and seizing during the mold closing process, improving production efficiency and the operational reliability of automated equipment.

[0019] (3) Reduced cost and easy maintenance: The structure is simple and the modification cost is low. The limit pin is a standard vulnerable part and is easy to replace, which reduces the downtime of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the temperature-resistant variable casting welding device of the present invention.

[0021] Figure 2 This is a front view and a cross-sectional view of the cast-welded turnover plate in the temperature-resistant variable casting and welding device of the present invention.

[0022] Figure 3 This is a top view of the cast-welded turnover plate in the temperature-resistant variable casting and welding device of the present invention.

[0023] Figure label: 1. Cast and welded bottom mold, 11. Cast and welded cavity, 12. Positioning hole, 2. Cast and welded turnover plate, 21. Positioning groove, 22. Limiting pin, 23. Mounting hole, 24. Locking nut. Detailed Implementation

[0024] like Figures 1-3 As shown, a temperature-resistant variable casting and welding device includes a casting and welding bottom mold and a casting and welding turnover plate. The top surface of the casting and welding bottom mold has a casting and welding cavity. The casting and welding turnover plate has a positioning groove for positioning in conjunction with the battery compartment of the battery to be cast and welded. The casting and welding turnover plate is provided with a plurality of limiting pins. The lower end of the limiting pins protrudes from the bottom surface of the casting and welding turnover plate. The casting and welding bottom mold is provided with positioning holes for the limiting pins to extend into for positioning. The cross-section of the part of the limiting pin that mates with the positioning hole is elliptical.

[0025] The major axis of the ellipse is 0.4~0.7mm smaller than the inner diameter of the positioning hole, while the minor axis is 1.3~2.2mm smaller than the major axis. The smaller gap between the locating pin and the positioning hole along the major axis of the ellipse allows for more precise positioning and significantly restricts the movement of the transfer plate in this direction, resulting in extremely high alignment accuracy and ensuring that the electrode tabs accurately fall into their corresponding positions within the casting cavity. Conversely, the larger gap between the locating pin and the positioning hole along the minor axis of the ellipse serves as a guide and tolerance, ensuring that even with minor alignment deviations or thermal deformation during the fit between the positioning hole and the locating pin at high temperatures, the locating pin can easily enter the positioning hole, effectively preventing jamming and seizing.

[0026] In the existing technology, the inner diameter of the positioning hole is generally 10mm. Without changing this size, the existing casting and welding mold can be used. Only the shape and size of the limit pin can be improved: the major axis of the ellipse is 9.3~9.6mm and the minor axis is 7.4~8.0mm. This reduces the difficulty and cost of modification, while optimizing the casting and welding effect.

[0027] In some feasible implementations, the limiting pins include four pins located at the four corners of the cast-welded turnover plate. The four limiting pins provide support at the four corners of the cast-welded turnover plate, effectively preventing unilateral tilting of the cast-welded turnover plate, ensuring its parallelism with the cast-welded bottom mold, and the even distribution of the limiting pins provides uniform guiding force, making the mold closing process smoother and resisting shaking.

[0028] In some feasible implementations, the lower end of the locating pin is a pointed tip. The pointed tip serves as a guide, making it easier for the locating pin to enter the positioning hole and reducing the rigid collision between the bottom surface of the locating pin and the surface of the cast-welded base film.

[0029] In some feasible implementations, the positioning hole is a through hole that penetrates the bottom casting film. The machining of through holes is simpler and can effectively reduce manufacturing costs; through holes facilitate the thorough cleaning of lead slag residue splashed at high temperatures, completely eliminating positioning inaccuracies caused by blockages; the through structure of the through hole also helps to evenly dissipate heat, reducing thermal deformation of the mold caused by local high temperatures, thereby maintaining the accuracy and stability of the positioning system in the long term.

[0030] In some feasible implementations, the cast-welded turnover plate has mounting holes, and the limiting pin has an enlarged limiting step. The portion of the limiting pin above the limiting step extends into the mounting hole, and the portion extending out of the mounting hole has an external thread section, which is fitted with a lock nut. This structure enables quick assembly and disassembly and precise positioning. The lock nut securely locks the limiting pin, preventing it from loosening during operation and ensuring stable positioning accuracy. Simultaneously, loosening the nut allows for quick replacement of worn limiting pins, greatly simplifying the maintenance process and effectively reducing equipment downtime.

[0031] When using the temperature-resistant variable casting and welding device, the lead-acid battery to be cast and welded is placed upside down on the casting and welding turnover plate 2 and positioned and matched with the positioning groove 21 on the casting and welding turnover plate 2. Then, the casting and welding bottom film 1 is inserted into the lead pot at a temperature of 480~500℃ to immerse in molten lead, so that the molten lead fills the casting and welding cavity 11. After the casting and welding bottom film 1 is lifted, the mold is hung to remove excess molten lead from the surface of the casting and welding bottom film 1. Then, the casting and welding turntable 2 is lowered, and the tabs of the lead-acid battery to be cast and welded are immersed in the molten lead. The limiting pin 22 is passed through the mounting hole 23 on the casting and welding turntable 2 and then inserted into the positioning hole 12. The limiting pin 22 is rotated to minimize the gap between the long axis of the cross-section of the limiting pin 22 and the positioning hole 12. The limiting pin 22 is then fixed above the casting and welding turntable 2 with the locking nut 24. At this time, the tabs of the lead-acid battery are inserted into the molten lead in the casting and welding cavity 11 and held for 10~12 seconds. After the casting and welding bottom film 1 cools, the molten lead in the casting and welding cavity 11 forms a manifold, and the casting and welding is completed.

Claims

1. A temperature-resistant variable casting and welding device, comprising a casting and welding base mold and a casting and welding turnover plate, wherein the top surface of the casting and welding base mold has a casting and welding cavity, the casting and welding turnover plate has a positioning groove for positioning in conjunction with a battery compartment of a battery to be cast and welded, the casting and welding turnover plate is provided with a plurality of limiting pins, the lower ends of the limiting pins protruding from the bottom surface of the casting and welding turnover plate, and the casting and welding base mold is provided with positioning holes for the limiting pins to extend into for positioning, characterized in that, The cross-section of the portion where the limiting pin mates with the positioning hole is elliptical.

2. The temperature-resistant variable casting welding device according to claim 1, characterized in that, The length of the major axis of the ellipse is 0.4 to 0.7 mm smaller than the inner diameter of the positioning hole, and the length of the minor axis is 1.3 to 2.2 mm smaller than the length of the major axis.

3. The temperature-resistant variable casting welding device according to claim 2, characterized in that, The inner diameter of the positioning hole is 10mm, and the major axis of the ellipse is 9.3~9.6mm, and the minor axis is 7.4~8.0mm.

4. The temperature-resistant variable casting welding device according to claim 1, characterized in that, The limiting pins include four pins located at the four corners of the cast and welded turnover plate.

5. The temperature-resistant variable casting welding device according to claim 1, characterized in that, The positioning hole is a through hole that penetrates the cast-welded base film.

6. The temperature-resistant variable casting welding device according to claim 1, characterized in that, The lower end of the limiting pin is a pointed tip.

7. The temperature-resistant variable casting welding device according to claim 1, characterized in that, The cast-welded turnover plate is provided with mounting holes. The limiting pin has an enlarged limiting step. The portion of the limiting pin above the limiting step extends into the mounting hole, and the portion extending out of the mounting hole has an external thread section, which is fitted with a locking nut.

8. An assembly method for a temperature-resistant variable casting welding device, characterized in that, When using the temperature-resistant variable casting welding device according to any one of claims 1 to 7, the limiting pin extends into the positioning hole, and the limiting pin is rotated to minimize the gap between the long axis of the limiting pin cross-section and the positioning hole.

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