A welding tool for a metal elbow

Abstract

The utility model discloses a kind of welding tool of metal elbow pipe, including mounting plate, locating block, a pair of locating plate and thin air cylinder.Mounting plate is rotationally supported with mounting shaft in the center through bearing block, and its top end is coaxially connected with mounting frame with reinforcing rib;Locating block is located at the top of mounting frame, with profiled locating groove to match the outer bending piece of metal elbow pipe;A pair of locating plate is symmetrically hinged in the upside of mounting frame, and its free end is equipped with C-shaped locating strip to compress the inner bending piece of metal elbow pipe;Thin air cylinder drives locating plate to open and close synchronously through hinged strip, realizes automatic clamping.Mounting shaft middle part is equipped with mounting strip, cooperates with limiting block with rubber buffer and permanent magnetic adsorption function, realizes angle limiting and stable parking.By high-temperature resistant gas pipe, it is connected to locating plate, for suction toxic fume when welding.This tool is accurate in positioning, reliable in clamping, supports multi-angle welding, with high efficiency, stability and environmental protection, suitable for high-quality spot welding production of metal elbow pipe in automobile, hydraulic and other fields.

Description

Technical Field

[0001] This utility model relates to the technical field of maize breeding, specifically to a welding fixture for a metal pipe bend. Background Technology

[0002] Metal elbows (typically formed by butt welding of outer and inner elbows) are widely used as critical fluid or structural components in the automotive, rail transportation, construction machinery, and refrigeration equipment industries. These elbows typically employ a two-piece stamped structure, with the outer and inner elbows welded together along their edges via butt welds to form a closed tubular channel. Due to the complex geometry and significant curvature variations of the elbows, and the high requirements for weld strength and appearance consistency, the welding process places extremely high demands on positioning accuracy, clamping stability, and thermal deformation control.

[0003] The industry commonly uses simple fixtures or general-purpose welding platforms for the assembly and welding of such bent pipes. However, existing tooling has many shortcomings: (1) Most fixtures rely on rigid blocks or manual pressure plates to roughly position the bend, which makes it difficult to accurately match the inner and outer contours of the bend, resulting in uneven assembly gaps and easy to cause welding defects such as incomplete fusion, burn-through or misalignment. (2) The clamping mechanism is mostly single-point or asynchronous clamping, which cannot guarantee that the inner and outer bending plates fit evenly in the entire weld area. Especially in the area where the curvature of the bend is large, local lifting is likely to occur, which seriously affects the welding quality. (3) High-temperature fumes (containing harmful substances such as metal oxides and fluorides) generated during welding often lack effective extraction measures, which not only endanger the health of operators, but may also adhere to the weld surface, causing porosity or inclusions. (4) Traditional tooling lacks rotation or angle limiting functions, requiring manual adjustment of the workpiece posture to adapt to different weld positions, resulting in low efficiency and poor consistency.

[0004] Although some automated welding fixtures have introduced pneumatic clamping or servo rotation functions, their structures are complex and costly, and they have not been specifically optimized for the unique double-piece docking structure of metal bends, making it difficult to balance positioning accuracy, clamping reliability and process adaptability.

[0005] Therefore, there is an urgent need for a special welding fixture with a reasonable structure, convenient operation, and functions such as efficient positioning, synchronous clamping, fume extraction, and angle limiting, in order to meet the modern manufacturing needs of high quality, high efficiency, safety, and environmental protection. Utility Model Content

[0006] The purpose of this invention is to provide a welding fixture for bending metal pipes, so as to solve the above-mentioned defects caused by the prior art.

[0007] A welding fixture for bending metal pipes includes a mounting plate, a positioning block, a pair of positioning plates, and a thin cylinder; The mounting plate has a mounting shaft rotatably supported at its center by a bearing seat, and the top end of the mounting shaft is coaxially connected to a mounting frame via a flange. The positioning block is fixed at the middle position of the top of the mounting frame, and its top is provided with a positioning groove that matches the outline of the outer bending plate of the metal bend. A pair of positioning plates are symmetrically hinged to the upper side of the mounting frame. Each positioning plate has a C-shaped positioning strip at one end near the positioning block, which is used to press the inner bending plate of the metal bend in the clamped state. The thin cylinder is vertically mounted in the middle of the bottom of the mounting frame. The piston rod end is connected to a hinge seat, and a pair of hinge bars are hinged on the hinge seat. The upper end of each hinge bar is respectively hinged to the corresponding positioning plate, so that the two positioning plates can be driven to open or close synchronously through the extension and retraction of the thin cylinder, thereby realizing the automatic clamping and release of the metal bend.

[0008] Preferably, the mounting shaft has a mounting strip extending outward from the middle, and the mounting plate has a pair of limiting blocks symmetrically arranged on the front and rear sides of the mounting shaft.

[0009] Preferably, a rubber block is embedded in the upper part of each limiting block.

[0010] Preferably, a permanent magnet is embedded in the center of the rubber block.

[0011] Preferably, reinforcing ribs are welded at each corner of the mounting frame.

[0012] Preferably, each positioning plate has a high-temperature resistant air pipe connected to one end of the positioning block via a quick-connect air pipe connector.

[0013] Compared with the prior art, the present invention has the following advantages: 1. High-precision contour positioning: By setting a positioning groove on the top of the positioning block that perfectly matches the contour of the outer bending plate, the precise positioning of the outer side of the bend is achieved; at the same time, the C-shaped positioning strip fits the contour of the inner bending plate, forming "internal and external cooperative constraint" in the clamping state, effectively eliminating assembly gaps, ensuring tight fit at the root of the weld, and significantly improving the quality of welding formation.

[0014] 2. Synchronous linkage clamping mechanism: A thin cylinder drives the hinge seat and a pair of hinge bars, which drive the positioning plates on both sides to swing synchronously around the hinge seat, so as to achieve synchronous, symmetrical and uniform clamping of the two ends of the inner bending piece, avoiding stress imbalance or local warping caused by traditional single-sided clamping.

[0015] 3. Integrated fume extraction function: High-temperature resistant gas pipes are installed in the area near the weld seam of the positioning plate and connected to an external negative pressure system. High-temperature fumes can be extracted in real time and at fixed points during the welding process, which can significantly reduce the concentration of harmful substances in the work area and improve the working environment.

[0016] 4. Adjustable angle limit and anti-collision protection: The entire clamping mechanism is rotated by the mounting shaft, and the limit block with rubber block realizes the preset angle for quick positioning and buffer stop; the rubber block is embedded with a permanent magnet, which can attract and fix the tooling posture in the welding state to prevent accidental rotation, and take into account both operational flexibility and safety.

[0017] In summary, this utility model not only solves the long-standing technical problems in metal pipe bending welding, such as inaccurate positioning, uneven clamping, and fume pollution, but also makes substantial progress in improving welding quality, ensuring operational safety, and increasing production efficiency, and has good prospects for industrial application. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a side view of the overall structure of this utility model.

[0020] Figure 3 This is a schematic diagram of a partial explosion of the limiting block.

[0021] Figure 4 This is a partial three-dimensional structural diagram of the mounting frame.

[0022] Figure 5 This is a partial three-dimensional structural diagram of the positioning block.

[0023] Figure 6 This is a three-dimensional structural diagram of the metal bend.

[0024] in: 10-Mounting plate; 11-Bearing housing; 12-Mounting shaft; 13-Mounting strip; 14-Limiting block; 15-Rubber block; 16-Permanent magnet; 17-Flange; 18-Mounting frame; 18a-Through groove; 19-Reinforcing rib; 20-Positioning block; 20a-Positioning groove; 21-Positioning plate; 22-Positioning strip; 23-Quick connector for air hose; 24-High temperature resistant air hose; 25-Thin cylinder; 26-Hinge seat; 27-Hinge strip; 50 - Metal bend; 501 - Outer bend; 502 - Inner bend; 503 - Weld point. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] like Figures 1 to 6 As shown, a welding fixture for a metal bend includes a mounting plate 10, a positioning block 20, a pair of positioning plates 21, and a thin cylinder 25. The mounting plate 10 has a mounting shaft 12 rotatably supported at its center by a bearing seat 11. The top end of the mounting shaft 12 is coaxially connected to a mounting frame 18 via a flange 17. The mounting shaft 12 rotates smoothly through the bearing seat 11, which facilitates the adjustment or flipping of the bend during the welding process, meets the requirements of multi-directional welds, and improves welding accessibility.

[0027] The positioning block 20 is fixed at the middle position of the top of the mounting frame 18, and its top is provided with a positioning groove 20a that matches the contour of the outer bending piece 501 of the metal bend 50. The contour positioning groove 20a precisely fits the contour of the outer bending piece 501 of the metal bend 50, ensuring accurate initial positioning of the workpiece and preventing dimensional deviation or incomplete welding caused by offset during the welding process.

[0028] A pair of positioning plates 21 are symmetrically hinged to the upper side of the mounting frame 18. Each positioning plate 21 has a C-shaped positioning strip 22 at one end near the positioning block 20, which is used to press the inner bending piece 502 of the metal bend 50 in the clamped state. The C-shaped positioning strip 22 applies clamping force from the inner bending side, forming an internal and external cooperating constraint with the outer bending positioning groove 20a, effectively preventing the metal bend 50 from warping or loosening under welding heat deformation, and ensuring assembly accuracy.

[0029] The thin cylinder 25 is vertically mounted at the center of the bottom of the mounting frame 18. Its piston rod is connected to a hinge seat 26, on which a pair of hinge bars 27 are hinged. The upper end of each hinge bar 27 is hinged to a corresponding positioning plate 21. The extension and retraction of the thin cylinder 25 drives the two positioning plates 21 to open or close synchronously, achieving automatic clamping and release of the metal bend 50. The pneumatic linkage mechanism achieves synchronous clamping on both sides, resulting in smooth operation, fast response, and uniform clamping force, avoiding workpiece tilting caused by unilateral force.

[0030] In this embodiment, an installation strip 13 extends outward from the middle of the mounting shaft 12, and a pair of limiting blocks 14 are symmetrically arranged on the front and rear sides of the mounting shaft 12 on the mounting plate 10. The installation strip 13 and the limiting blocks 14 cooperate to form a rotation angle limiting structure, preventing the mounting frame 18 from rotating excessively, ensuring that the metal bend 50 stays stably in the preset welding posture, and improving process repeatability.

[0031] In this embodiment, a rubber block 15 is embedded in the upper part of each limiting block 14. The rubber block 15 buffers the impact between the mounting strip 13 and the limiting block 14, reduces mechanical impact noise, reduces metal wear, and extends the service life of the mechanism.

[0032] In this embodiment, a permanent magnet 16 is embedded in the center of the rubber block 15. The permanent magnet 16 can attract the steel mounting strip 13 and provide magnetic holding force when it reaches the limit position, thereby enhancing positioning stability and preventing angular deviation caused by vibration.

[0033] In this embodiment, reinforcing ribs 19 are welded at each corner of the mounting frame 18. The reinforcing ribs 19 significantly improve the rigidity and torsional resistance of the mounting frame 18, preventing deformation under clamping or welding heat loads and ensuring positioning accuracy during long-term use.

[0034] In this embodiment, each positioning plate 21 is connected to a high-temperature resistant air pipe 24 via a quick-connect air pipe 23 at one end near the positioning block 20. The high-temperature resistant air pipe 24 is connected to an external negative pressure air source and is used to extract toxic and harmful fumes generated during the welding of the outer bending plate 501 and the inner bending plate 502 in real time, effectively improving the working environment, protecting the health of operators, and reducing the interference of fumes on the weld quality.

[0035] In this embodiment, the metal bend 50 is formed by spot welding an outer curved plate 501 and an inner curved plate 502 together, with three weld points on each side.

[0036] The working process of a welding fixture for bending metal pipes is as follows: First, place the outer bending piece 501 of the metal bend 50 on the positioning block 20, so that its outer contour fits tightly with the positioning groove 20a on the top of the positioning block 20, thereby achieving precise positioning of the outer bending piece 501. Subsequently, the inner bending piece 502 is fastened from top to bottom onto the already positioned outer bending piece 501, so that the edges of the two are aligned to form a butt joint to be welded. Next, the thin cylinder 25 is activated, and its piston rod retracts downward, causing the hinge seat 26 to descend. This, in turn, causes the positioning plates 21 on both sides to swing inward around their hinge points through a pair of hinge bars 27. During this process, the C-shaped positioning bars 22 at the ends of each positioning plate 21 gradually press against the two ends of the inner bending piece 502, while applying a uniform clamping force to the overlapping ends of the inner and outer bending pieces 501 and 502, effectively preventing warping or misalignment caused by thermal deformation during welding. After the workpiece is reliably clamped, the welding equipment can perform automatic or semi-automatic welding along the butt joint. After welding is completed, the piston rod of the thin cylinder 25 extends upward, driving the hinge seat 26 and hinge bar 27 to reset, causing the positioning plate 21 to open outward, releasing the constraint on the metal bend 50, and the operator can then remove the welded metal bend 50, completing one work cycle.

[0037] This process achieves integrated operation of precise positioning, stable clamping, efficient welding, and rapid release, significantly improving welding consistency and production efficiency.

[0038] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A welding fixture for bending metal pipes, characterized in that, Includes mounting plate (10), positioning block (20), a pair of positioning plates (21) and thin cylinder (25); The center of the mounting plate (10) is rotatably supported by the mounting shaft (12) through the bearing seat (11), and the top end of the mounting shaft (12) is coaxially connected to the mounting frame (18) through the flange (17). The positioning block (20) is fixed at the middle position of the top of the mounting frame (18), and its top is provided with a positioning groove (20a) that matches the outline of the outer bending piece (501) of the metal bend (50). A pair of positioning plates (21) are symmetrically hinged to the upper side of the mounting frame (18). Each positioning plate (21) has a C-shaped positioning strip (22) at one end near the positioning block (20) for pressing the inner bending piece (502) of the metal bend (50) in the clamped state. The thin cylinder (25) is vertically mounted at the middle position of the bottom of the mounting frame (18). The piston rod end is connected to a hinge seat (26). A pair of hinge bars (27) are hinged on the hinge seat (26). The upper end of each hinge bar (27) is respectively hinged to the corresponding positioning plate (21) so that the two positioning plates (21) can be opened or closed synchronously through the extension and retraction action of the thin cylinder (25) to realize the automatic clamping and release of the metal bend (50).

2. The welding fixture for a metal pipe bend according to claim 1, characterized in that, The mounting shaft (12) has a mounting strip (13) extending outward from the middle, and the mounting plate (10) has a pair of limiting blocks (14) symmetrically arranged on the front and rear sides of the mounting shaft (12).

3. The welding fixture for a metal pipe bend according to claim 2, characterized in that, Each limiting block (14) has a rubber block (15) embedded in its upper part.

4. The welding fixture for a metal pipe bend according to claim 3, characterized in that, A permanent magnet (16) is embedded in the center of the rubber block (15).

5. The welding fixture for a metal pipe bend according to claim 1, characterized in that, The mounting frame (18) is reinforced with ribs (19) welded at each corner.

6. The welding fixture for a metal pipe bend according to claim 1, characterized in that, Each positioning plate (21) has a high-temperature resistant air pipe (24) connected to one end of the positioning block (20) via a quick air pipe connector (23).

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