Clamping protection device for welding multiple layers of sheet workpieces
By designing a positioning protection device with a fan-shaped clamp and a hinged snap-fit structure, the problems of non-fitting at the cut corner of the thin sheet and spark damage are solved, improving welding quality and heat dissipation efficiency, and adapting to various working conditions of multi-layer thin sheet welding.
Patent Information
- Application Number
- CN202520564700.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-28
AI Technical Summary
When welding multi-layer thin sheet workpieces, the incomplete fit of the cut corner position leads to abnormal weld width and low welding quality. In addition, the spatter during the welding process damages the surface of the thin sheet, affecting the quality. At the same time, the slow heat dissipation of the cut corner position leads to uneven thermal expansion and severe deformation.
Design a clamping protection device including an upper clamping plate and a lower clamping plate. It adopts a fan-shaped structure and a hinge assembly. Through hinge and buckle connection, it ensures effective clamping and protection of the cut corner position of the thin sheet. It uses copper material to improve the heat conduction speed and further clamps it with tightening bolts.
It achieves tight welding at the corner of thin sheet, improves welding quality, reduces spark damage, enhances heat dissipation, avoids deformation, and meets the welding requirements of multi-layer thin sheets.
Smart Images
Figure CN223932966U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of welding tool technology, specifically, it relates to a positioning protection device for welding multi-layer thin sheet workpieces. Background Technology
[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid. The interior of a heat exchanger is filled with thin fins, which significantly increase the heat transfer area between the hot and cold fluids. For example, in a plate heat exchanger, numerous fins are closely arranged, allowing the hot and cold fluids to flow along the sides of the fins, greatly increasing the heat transfer area and achieving efficient heat transfer. These fins are not single fins; they are formed by welding the edges of two fins together, creating an internal cavity between them for fluid flow.
[0003] In the manufacturing process of heat exchanger fins, two equal-sized fins are first overlapped and clamped together, and then the edges requiring a fixed connection are welded together using a welding torch. However, the following problems exist in the actual welding process.
[0004] 1. Two thin sheets are clamped together using positive pressure or a special fixture. However, the corner of the two sheets is easily overlooked. This corner is far from the fixture, and the two sheets are not fully fitted together, resulting in a weld width at the corner that is larger than the normal weld, and the welding quality is low.
[0005] 2. During the welding process, there are a lot of spattering "sparks". These "sparks" are high-temperature metal particles. When the "sparks" splash onto the surface of the sheet, they damage the surface of the sheet, forming black spots and tiny pits, which affects the surface quality of the heat exchanger sheet.
[0006] 3. The heat dissipation rate at the chamfered corner is slow, while the temperature rises rapidly at the chamfered corner. The uneven temperature field will cause different degrees of thermal expansion in different parts, resulting in severe deformation at the chamfered corner. Utility Model Content
[0007] To address the shortcomings of existing technologies, this utility model provides a positioning and protection device for welding multi-layer thin sheet workpieces, including an upper clamping plate and a lower clamping plate; one side of the upper clamping plate is hinged to one side of the lower clamping plate via a hinge assembly, and the upper clamping plate swings around the hinge assembly to the top of the lower clamping plate, thereby causing the upper and lower clamping plates to overlap; the other side of the upper clamping plate is detachably connected to the corresponding side of the lower clamping plate via a snap fastener, and the same side of the upper and lower clamping plates is provided with an arc-shaped notch; the upper clamping plate is provided with a through hole on its top surface, and the through hole is provided with a downward-screwing tightening bolt.
[0008] The preferred embodiment of this invention is as follows: the upper and lower clamping plates have the same shape and are both fan-shaped, with the arc-shaped notch located at the center of the upper and lower clamping plates. Further, the hinge assembly is located on one radial side of the upper clamping plate, and the buckle is located on the other radial side of the upper clamping plate. The fan-shaped structure of the upper and lower clamping plates expands the protection area outside the weld. If welding is performed on a flat surface, the larger the area of the thin sheet covered by the upper clamping plate, the lower the possibility of the thin sheet being burned by welding sparks, and the better the protection effect.
[0009] The preferred embodiment of this utility model is as follows: the hinge assembly includes an upper ear plate group, a lower ear plate group, and a hinge shaft; the upper ear plate group is fixedly connected to the side of the upper clamping plate, and the lower ear plate group is fixedly connected to the side of the lower clamping plate, with all the upper ear plates of the upper ear plate group and all the lower ear plates of the lower ear plate group being staggered; the hinge shaft passes through the center hole of the upper ear plate group and the center hole of the lower ear plate group. There are four upper ear plates and four lower ear plates, forming four pairs of hinge structures through which the hinge shaft passes. The maximum stress that can be withstood is sufficient to clamp two or more thin plates together, resulting in a robust hinge structure with a long service life.
[0010] The preferred embodiment of this utility model is as follows: the hinge shaft is fitted with multiple torsion springs, all of which are located between adjacent upper and lower ear plates, and one end of the torsion spring is fixedly connected to the corresponding upper ear plate, and the other end of the torsion spring is fixedly connected to the corresponding lower ear plate.
[0011] The preferred embodiment of this utility model is as follows: the buckle is shaped like a "7", with its lower part hinged to the side of the lower clamping plate. The upper part of the buckle swings upward around the lower hinge rod to the top of the upper clamping plate, thereby clamping the lower part of the upper clamping plate and the upper part of the lower clamping plate. Additionally, the upper clamping plate has an anti-slip notch corresponding to the upper part of the buckle, and the buckle has an anti-slip pad corresponding to the anti-slip notch. After the upper and lower clamping plates overlap, the buckle swings upward into the anti-slip notch, where the anti-slip pad contacts the notch, locking the upper and lower clamping plates. Conversely, swinging the buckle downward quickly unlocks the upper and lower clamping plates. The locking and unlocking operations of the upper and lower clamping plates are very simple, simplifying the workpiece clamping process and improving the welding effect.
[0012] The preferred embodiment of this utility model is as follows: the upper and lower clamping plates are made of copper, and the thin sheet is clamped between the upper and lower clamping plates, with the thin sheet in full contact with the upper and lower clamping plates. Using copper can improve the heat conduction speed, and the temperature of the thin sheet rises rapidly during the welding process. Subsequently, the heat is quickly transferred to the upper and lower clamping plates. The upper and lower clamping plates themselves have fast heat conduction and large area, so heat dissipation is also fast, which can quickly reduce the temperature at the cut weld.
[0013] The beneficial effects of the positioning protection device for welding multi-layer thin sheet workpieces in this utility model are as follows:
[0014] 1. Compared with existing welding fixtures, the upper and lower clamps are specially designed for welding positions at the chamfered corners. The clamping operation is simple. The chamfered corner is located at the arc-shaped notch. The upper and lower clamps protect both sides of the overlapping thin sheet, which can meet the requirements of horizontal welding, longitudinal welding, and inclined welding, and the protection effect is good.
[0015] 2. The upper and lower clamping plates are hinged on one side, and the other side uses a snap-fit for quick connection or separation. Flip the upper clamping plate upwards around the hinged assembly, then place the chamfered corner of the overlapping sheet onto the lower clamping plate. Finally, place the upper clamping plate on top of the lower clamping plate and snap the snaps on. The entire clamping operation is very simple and does not affect welding efficiency. After the sheet is clamped, the weld at the chamfered corner is tightly fitted, resulting in good weld quality and effectively solving the problem of abnormal weld width at the chamfered corner.
[0016] 3. If there are more than four overlapping sheets, tighten the bolts into the through holes and tighten the sheets to further clamp them. This can meet the welding requirements of six or eight sheets and is highly versatile. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This utility model provides a three-dimensional positioning protection device for welding multi-layer thin sheet workpieces. Figure 1 ;
[0019] Figure 2 This utility model provides a three-dimensional positioning protection device for welding multi-layer thin sheet workpieces. Figure 2 ;
[0020] Figure 3 This utility model provides a three-dimensional positioning protection device for welding multi-layer thin sheet workpieces. Figure 3 ;
[0021] Figure 4 This is a schematic diagram of the clamping and protection device for welding multi-layer thin sheet workpieces in this utility model after the thin sheet is clamped.
[0022] Attached reference numerals: 1. Upper clamping plate; 2. Lower clamping plate; 3. Arc-shaped notch; 4. Upper ear plate; 5. Lower ear plate; 6. Hinge shaft; 7. Torsion spring; 8. Buckle; 9. Anti-slip notch; 10. Anti-slip pad; 11. Nut; 12. Tightening bolt; 13. Through hole; 14. Thin sheet. Detailed Implementation
[0023] In view of the shortcomings of the prior art, the inventor of this utility model has, through long-term research and extensive practice, proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.
[0024] like Figure 1 and Figure 4 As shown, Embodiment 1 provides a clamping and protection device for welding multi-layer thin sheet workpieces, including an upper clamping plate 1 and a lower clamping plate 2. The upper clamping plate 1 and the lower clamping plate 2 are made of copper, but are not limited to copper; they can be other materials with the same or better thermal conductivity, and this embodiment does not impose any restrictions. The upper clamping plate 1 and the lower clamping plate 2 have the same shape and are both fan-shaped. After the upper clamping plate 1 and the lower clamping plate 2 overlap, an arc-shaped notch 3 is provided at the center of both. After the upper clamping plate 1 and the lower clamping plate 2 clamp the thin sheet 14, the cut corner of the thin sheet 14 is just exposed at the arc-shaped notch 3. The purpose of the upper clamping plate 1 and the lower clamping plate 2 adopting a fan shape is to expand the protection area outside the weld. If welding is performed on a plane, the larger the area of the thin sheet 14 covered by the upper clamping plate 1, the smaller the possibility of the thin sheet 14 being burned by welding spatter, and the better the protection effect.
[0025] The specific connection structure between the upper clamping plate 1 and the lower clamping plate 2 is as follows:
[0026] like Figure 2 and Figure 3 As shown, one side of the upper clamping plate 1 is hinged to one radial side of the lower clamping plate 2 via a hinge assembly. The upper clamping plate 1 swings around the hinge assembly to the top of the lower clamping plate 2, thereby causing the upper clamping plate 1 and the lower clamping plate 2 to overlap. The specific structure of the hinge assembly is as follows: the hinge assembly includes an upper ear plate group 4, a lower ear plate group 5, and a hinge shaft 6; the upper ear plate group 4 is fixedly connected to the side of the upper clamping plate 1, and the lower ear plate group 5 is fixedly connected to the side of the lower clamping plate 2, and all the upper ear plates 4 of the upper ear plate group 4 and all the lower ear plates 5 of the lower ear plate group 5 are staggered; the hinge shaft 6 passes through the central hole of the upper ear plate group 4 and the central hole of the lower ear plate group 5. There are four upper ear plates 4 and four lower ear plates 5, which are connected by the hinge shaft 6 to form four pairs of hinge structures. The maximum stress that can be withstood is sufficient to clamp two or more thin plates 14, and the hinge structure is strong and has a long service life. In addition, for ease of use, an automatic closing mechanism is provided between the upper clamping plate 1 and the lower clamping plate 2. Specifically, three torsion springs 7 are sleeved on the hinge shaft 6. All torsion springs 7 are located between adjacent upper ear plates 4 and lower ear plates 5, with one end of each torsion spring 7 fixedly connected to the corresponding upper ear plate 4 and the other end of each torsion spring 7 fixedly connected to the corresponding lower ear plate 5. After lifting the upper clamping plate 1, the thin sheet 14 is placed on the lower clamping plate 2, and then the upper clamping plate 1 is released. The elastic force of the torsion springs 7 automatically closes the upper clamping plate 1 onto the lower clamping plate 2, and the upper clamping plate 1 and lower clamping plate 2 automatically overlap, eliminating the need for manual closing and making it more convenient to use.
[0027] The other radial side of the upper clamping plate 1 is detachably connected to the corresponding radial side of the lower clamping plate 2 via a buckle 8. The specific structure of the buckle 8 is as follows:
[0028] like Figure 2 As shown, the buckle 8 is shaped like a "7". The lower part of the buckle 8 is hinged to the side of the lower clamping plate 2. The upper part of the buckle swings upward around the lower hinge rod to the top of the upper clamping plate 1, thereby clamping the lower part of the upper clamping plate 1 and the upper part of the lower clamping plate 2. Additionally, the upper clamping plate 1 has an anti-slip notch 9 corresponding to the upper part of the buckle 8, and the buckle 8 has an anti-slip pad 10 corresponding to the anti-slip notch 9. After the upper clamping plate 1 and the lower clamping plate 2 overlap, the buckle 8 swings upward into the anti-slip notch 9, where the anti-slip pad 10 contacts the anti-slip notch 9, locking the upper clamping plate 1 and the lower clamping plate 2. Conversely, swinging the buckle 8 downward quickly unlocks the upper clamping plate 1 and the lower clamping plate 2. The locking and unlocking operation of the upper clamping plate 1 and the lower clamping plate 2 is very simple, simplifying the workpiece clamping process and improving the welding effect.
[0029] This embodiment provides a welding method for welding the corner of a thin sheet, the steps of which are as follows:
[0030] S1. Open the buckle 8 and place the two overlapping thin plates 14 between the upper clamping plate 1 and the lower clamping plate 2, with the cut corner of the thin plate 14 located at the arc-shaped notch 3.
[0031] S2. Loosen the upper clamp 1. Under the elastic force of the torsion spring 7, the upper clamp 1 and the lower clamp 2 will automatically close and overlap.
[0032] S3. Swing the buckle 8 upwards so that the anti-slip pad 10 of the buckle 8 is engaged at the anti-slip notch 9, thereby clamping the thin sheet 14 between the upper clamping plate 1 and the lower clamping plate 2.
[0033] S4. Use a welding torch to weld the gap at the cut to complete the welding.
[0034] During the above welding process, the two thin plates 14 of the cut fit tightly together, which can ensure the normal width of the weld. At the same time, the upper clamping plate 1 and the lower clamping plate 2 increase the heat dissipation rate of the cut, thereby reducing the risk of excessive deformation at the cut caused by thermal stress during the welding process.
[0035] like Figure 1As shown, some heat exchanger fins 14 employ a multi-layer structure. For welding two or more fins 14, to ensure adequate fit at the cut edges, this embodiment provides a through hole 13 on the upper clamping plate 1. A coaxially fixed nut 11 is welded onto the through hole 13, and the nut 11 is equipped with a matching tightening bolt 12. After multiple fins 14 are clamped, the tightening bolt 12 is screwed into the through hole 13 and tightens the fins 14, further clamping them. This design can accommodate welding of six or eight fins, offering strong versatility. In this embodiment, the nut 11 and tightening bolt 12 form a single tightening structure. If the upper clamping plate 1 has a large area, two or three sets of tightening structures can be installed on it, depending on the specific circumstances.
[0036] It should be understood that the above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. It should not be considered that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.
Claims
1. A positioning protection device for welding multi-layer thin sheet workpieces, characterized in that: Includes upper and lower clamping plates; One side of the upper clamping plate is hinged to one side of the lower clamping plate by a hinge assembly. The upper clamping plate swings around the hinge assembly to the top of the lower clamping plate, thereby causing the upper and lower clamping plates to overlap. The other side of the upper clamping plate and the corresponding side of the lower clamping plate can be detachably connected by a buckle, and the same side of the upper clamping plate and the lower clamping plate are provided with an arc-shaped notch; The upper clamping plate has a through hole on its upper surface, and the through hole is equipped with a tightening bolt that screws downward.
2. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 1, characterized in that: The upper and lower clamping plates have the same shape and are both fan-shaped, and the arc-shaped notch is located at the center of the upper and lower clamping plates.
3. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 2, characterized in that: The hinge assembly is located on one radial side of the upper clamping plate, and the buckle is located on the other radial side of the upper clamping plate.
4. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 3, characterized in that: The hinge assembly includes an upper ear plate assembly, a lower ear plate assembly, and a hinge shaft; the upper ear plate assembly is fixedly connected to the side of the upper clamping plate, and the lower ear plate assembly is fixedly connected to the side of the lower clamping plate, with all the upper ear plates of the upper ear plate assembly and all the lower ear plates of the lower ear plate assembly being staggered; the hinge shaft passes through the center hole of the upper ear plate assembly and the center hole of the lower ear plate assembly.
5. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 4, characterized in that: The hinge shaft is fitted with multiple torsion springs. All torsion springs are located between adjacent upper and lower ear plates, with one end of the torsion spring fixedly connected to the corresponding upper ear plate and the other end of the torsion spring fixedly connected to the corresponding lower ear plate.
6. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 1, characterized in that: The buckle is shaped like the number 7. The lower part of the buckle is hinged to the side of the lower clamping plate. The upper part of the buckle swings upward around the hinge axis of the lower part to the top of the upper clamping plate, thereby clamping the lower part of the upper clamping plate and the upper part of the lower clamping plate.
7. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 6, characterized in that: The upper clamping plate has an anti-slip notch corresponding to the upper part of the buckle, and the buckle has an anti-slip pad corresponding to the anti-slip notch.
8. The positioning protection device for welding multi-layer thin sheet workpieces according to claim 1, characterized in that: The upper and lower clamping plates are made of copper.