A welding auxiliary tool suitable for irregular workpieces

Abstract

The utility model discloses a kind of welding auxiliary tool suitable for irregular workpiece, including auxiliary clamping tool, auxiliary clamping tool is respectively equipped with clamping mechanism A, clamping mechanism B and clamping mechanism C, clamping mechanism A is evenly provided with multiple sets of clamping core, the bottom of clamping mechanism A is fixedly provided with guide seat, the surface of auxiliary clamping tool is provided with accommodating hole, the inside of accommodating hole is provided with guide seat, the bottom of accommodating hole is provided with guide rail, the bottom of auxiliary clamping tool is fixedly provided with positioning disc. The welding auxiliary tool suitable for irregular workpiece, three clamping points are triangularly distributed to evenly disperse clamping force, avoid single-point stress too large to cause workpiece deformation, while each clamping mechanism can be independently self-adapting adjustment, adhere to the concave-convex feature of irregular workpiece surface, form the clamping state of multiple-point collaborative contact, improve the adaptability to complex shape.

Description

Technical Field

[0001] This utility model relates to the field of welding auxiliary equipment, specifically a welding auxiliary tooling suitable for irregular workpieces. Background Technology

[0002] In the automotive manufacturing industry, automotive part welding clamping devices are one of the essential clamping facilities in automotive manufacturing units. They are mainly used for welding and fixing automotive parts. Existing automotive part welding clamping devices generally use cylinders or other drive structures to move the clamping plate to fix the automotive parts, so that workers can perform welding operations on the automotive parts. However, in the above structure, since the drive structure such as cylinders is mostly fixed, the clamping plate can only move in one direction. It is generally only suitable for automotive parts of the same shape in the same batch, and it is not conducive to clamping other automotive parts with different shapes, thus resulting in low practicality.

[0003] To solve the above problems, after searching, Chinese patent with publication number CN221676247U was found, which discloses a welding clamping device for automotive parts. The document includes a telescopic joint whose length can be extended or retracted, thereby adjusting the position of the clamping plate to accommodate automotive parts of different sizes. The clamping plate is used to contact the automotive parts to clamp and fix them.

[0004] Although the above-mentioned device can clamp the automotive workpiece using two sets of clamping plates located on both sides, it can only clamp automotive workpieces with regular geometric shapes. When clamping irregular workpieces, it cannot achieve stable clamping and is prone to loosening during welding. Utility Model Content

[0005] The purpose of this invention is to provide a welding auxiliary fixture suitable for irregular workpieces, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a welding auxiliary fixture suitable for irregular workpieces is provided, comprising an auxiliary clamping fixture, on which clamping mechanism A, clamping mechanism B, and clamping mechanism C are respectively mounted. Clamping mechanism A has multiple sets of clamping cores evenly arranged on it, and a guide seat is fixedly provided at the bottom of clamping mechanism A. A receiving hole is opened on the surface of the auxiliary clamping fixture, and the guide seat is disposed inside the receiving hole. A guide rail is opened at the bottom of the receiving hole, and a positioning plate is fixedly provided at the bottom of the auxiliary clamping fixture. A cylinder is fixedly mounted on the positioning plate.

[0007] Furthermore, the auxiliary clamping fixture is a circular structure made of metal, with three sets of arc-shaped notches evenly opened on the outer circumference of the auxiliary clamping fixture, and three sets of support seats evenly fixed at the bottom of the auxiliary clamping fixture.

[0008] Furthermore, the clamping mechanisms A, B, and C are centrally symmetrical about the central axis of the auxiliary clamping fixture, and are synchronously driven by three sets of cylinders fixedly mounted on the positioning plate.

[0009] Furthermore, the clamping mechanism A is slidably disposed inside the two sets of guide rails via two sets of guide seats at the bottom. The cross-section of the guide seats and guide rails is an isosceles trapezoid. A connecting column is fixedly disposed at the bottom of each set of guide seats, and a connecting piece is fixedly disposed at the bottom of the connecting column.

[0010] Furthermore, the bottom of the clamping mechanism A is fixed by a guide seat, a connecting column, and a connecting piece. The connecting column is inserted inside the guide rail, and a fixed seat is fixedly connected to the bottom of the connecting piece. The end of the fixed seat is fixed to the piston rod of the cylinder.

[0011] Furthermore, the clamping core includes a support cylinder, a compression spring, a limiting seat, and a clamping rod. The end of the support cylinder is fixedly connected to the inner wall of the clamping mechanism A. A compression spring is fixedly installed inside the support cylinder. A limiting seat is slidably installed on the upper side inside the support cylinder. A clamping rod is fixedly installed on the top of the limiting seat. The outer corner of the top of the clamping rod is rounded. The compression spring is installed between the limiting seat and the bottom plate of the support cylinder. The axial cross-section of the support cylinder, the limiting seat, and the clamping rod is a concentric circle structure.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model utilizes a triangularly distributed clamping mechanism A, clamping mechanism B, and clamping mechanism C to clamp irregular workpieces. By leveraging the inherent stability of the triangular geometry, a stable support surface formed by the three points is achieved, enabling reliable positioning of the irregular contour. The triangular distribution of the three clamping points evenly distributes the clamping force, preventing excessive force at a single point from causing workpiece deformation. Simultaneously, each clamping mechanism can independently and adaptively adjust to conform to the uneven features of the irregular workpiece surface, forming a multi-point collaborative contact clamping state, thus improving adaptability to complex shapes.

[0014] 2. When the clamping rods on the clamping cores of this invention come into contact with the workpiece, the clamping rods compress the compression springs through the limiting seats at the bottom. The elastic buffering characteristics of the compression springs can be used to achieve adaptive flexible clamping. When the clamping rods come into contact with the workpieces, the compression deformation of the compression springs allows each clamping rod to independently conform to the concave and convex contours of the workpiece surface, forming multi-point flexible contact. The matrix-distributed multiple sets of clamping cores can evenly distribute the clamping force to multiple contact points of the workpieces. The elastic adjustment of the compression springs balances the force at each point, effectively preventing workpiece deformation caused by stress concentration at a single point. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a bottom view of the structural auxiliary clamping fixture of this utility model;

[0017] Figure 3 This is a partial structural diagram of the present invention;

[0018] Figure 4 This is a side view of the structural auxiliary clamping fixture of this utility model;

[0019] Figure 5 This is a cross-sectional view of the clamping core of this utility model;

[0020] Figure 6 This is a side view of the clamping core of this utility model.

[0021] The following are the labeling elements in the diagram: 1. Auxiliary clamping fixture; 2. Clamping mechanism A; 21. Clamping mechanism B; 22. Clamping mechanism C; 200. Clamping core; 2001. Support cylinder; 2002. Compression spring; 2003. Limiting seat; 2004. Clamping bar; 3. Support base; 4. Guide rail; 5. Receiving hole; 6. Guide seat; 61. Connecting piece; 62. Fixed base; 63. Cylinder; 64. Positioning plate. Detailed Implementation

[0022] Please see Figure 1-6 This utility model provides a welding auxiliary fixture suitable for irregular workpieces, including an auxiliary clamping fixture 1. The auxiliary clamping fixture 1 is equipped with a clamping mechanism A2, a clamping mechanism B21, and a clamping mechanism C22. The clamping mechanism A2 is evenly provided with multiple sets of clamping cores 200. A guide seat 6 is fixedly provided at the bottom of the clamping mechanism A2. A receiving hole 5 is opened on the surface of the auxiliary clamping fixture 1. The guide seat 6 is located inside the receiving hole 5. A guide rail 4 is opened at the bottom of the receiving hole 5. A positioning plate 64 is fixedly provided at the bottom of the auxiliary clamping fixture 1. A cylinder 63 is fixedly installed on the positioning plate 64.

[0023] As a preferred embodiment, the auxiliary clamping fixture 1 is a circular structure made of metal. Three sets of arc-shaped notches are evenly opened on the outer circumference of the auxiliary clamping fixture 1, and three sets of support seats 3 are evenly fixed at the bottom of the auxiliary clamping fixture 1.

[0024] The clamping mechanisms A2, B21, and C22 are centrally symmetrical about the central axis of the auxiliary clamping fixture 1. The clamping mechanisms A2, B21, and C22 are synchronously driven by three sets of cylinders 63 fixedly mounted on the positioning plate 64.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown: When clamping irregular workpieces using the triangularly distributed clamping mechanisms A2, B21, and C22, the inherent stability of the triangular geometry allows for effective restriction of the workpiece's multi-dimensional degrees of freedom in space through a stable support surface formed by the three points, achieving reliable positioning of irregular contours. The triangular distribution of the three clamping points evenly distributes the clamping force, preventing excessive force at a single point from causing workpiece deformation. Simultaneously, each clamping mechanism can independently and adaptively adjust to conform to the uneven surface of the irregular workpiece, forming a multi-point collaborative contact clamping state, improving adaptability to complex shapes. Through the symmetrical distribution of the triangles, positioning errors caused by the irregular shape of the workpiece are automatically compensated, maintaining a balance of clamping force in three-dimensional space. This ensures clamping accuracy while adapting to irregular workpieces of different sizes and specifications, reducing tooling changeover costs, and achieving efficient and stable clamping operations in automated production.

[0026] In a preferred embodiment, the clamping mechanism A2 is slidably disposed inside the two sets of guide seats 6 at the bottom. The cross-sections of the guide seats 6 and the guide rails 4 are isosceles trapezoids. A connecting column is fixedly disposed at the bottom of each set of guide seats 6, and a connecting piece 61 is fixedly disposed at the bottom of the connecting column.

[0027] The bottom of the clamping mechanism A2 is fixed by the guide seat 6, the connecting column and the connecting piece 61. The connecting column is inserted inside the guide rail 4. The bottom of the connecting piece 61 is fixedly connected to the fixing seat 62. The end of the fixing seat 62 is fixed to the piston rod of the cylinder 63.

[0028] like Figure 2 , Figure 3 and Figure 4As shown: The clamping mechanisms A2, B21 and C22 work in the same way. The movement of clamping mechanism A2 is as follows: the piston rod of cylinder 63 retracts, and through connecting piece 61 and fixed seat 62, it drives clamping mechanism A2 to move closer to the center of auxiliary clamping fixture 1. When clamping mechanism A2 moves, the guide seat 6 at its bottom is slidably set inside the guide rail 4, which can limit and guide the lateral movement of clamping mechanism A2, ensuring the stability of clamping mechanism A2 when moving.

[0029] In a preferred embodiment, the clamping core 200 includes a support cylinder 2001, a compression spring 2002, a limiting seat 2003, and a clamping rod 2004. The end of the support cylinder 2001 is fixedly connected to the inner wall of the clamping mechanism A2. The compression spring 2002 is fixedly disposed inside the support cylinder 2001. The limiting seat 2003 is slidably disposed on the upper side inside the support cylinder 2001. The clamping rod 2004 is fixedly disposed on the top of the limiting seat 2003. The outer corner of the top of the clamping rod 2004 is rounded. The compression spring 2002 is disposed between the limiting seat 2003 and the bottom plate of the support cylinder 2001. The axial cross-section of the support cylinder 2001, the limiting seat 2003, and the clamping rod 2004 is a concentric circle structure.

[0030] like Figure 1 , Figure 5 and Figure 6 As shown: Clamping mechanisms A2, B21, and C22 have multiple sets of clamping cores 200 evenly arranged in a matrix on their surfaces. When the clamping rods 2004 on the clamping cores 200 contact the workpiece, the clamping rods 2004 compress the compression springs 2002 through the bottom limiting seats 2003. This design, where the clamping rods 2004 compress the compression springs 2002 through the limiting seats 2003, utilizes the elastic buffering characteristics of the compression springs 2002 to achieve adaptive flexible clamping. When the clamping rods 2004 contact the workpiece, the compression deformation of the compression springs 2002 allows each clamping rod 2004 to independently conform to the concave and convex contours of the workpiece surface, forming multi-point flexible contact and avoiding the damage caused by rigid clamping. Damage to the workpiece surface; the matrix-distributed multiple sets of clamping cores 200 can evenly distribute the clamping force to multiple contact points of the workpiece, and the elastic adjustment of the compression spring 2002 balances the force at each point, effectively preventing workpiece deformation caused by stress concentration at a single point; this elastic clamping structure can also accommodate workpiece dimensional deviations. When there are slight differences in the shape of the workpiece, the compressibility of the compression spring 2002 allows the clamping rod 2004 to automatically adjust the extension length, ensuring that irregular workpieces of different specifications can obtain stable clamping force. At the same time, the limiting seat 2003 limits the compression stroke of the compression spring 2002, which ensures clamping rigidity and avoids excessive compression that could damage the mechanism, thus improving clamping adaptability while taking into account structural reliability.

[0031] Working Principle: In actual use, when welding irregular workpieces, to ensure the stability of the workpiece during welding and prevent loosening, the workpiece is placed on the auxiliary clamping fixture 1. Then, the external switch of cylinder 63 is activated, and the three sets of cylinders 63 work synchronously. Through the guide seat 6, connecting piece 61, and fixed seat 62, they respectively drive clamping mechanisms A2, B21, and C22 to converge towards the center of the auxiliary clamping fixture 1. By reducing the distance between clamping mechanisms A2, B21, and C22, the irregular workpiece is stably clamped. By utilizing the triangularly distributed clamping mechanisms A2, B21, and C22, along with a large number of retractable and spring-loaded clamping cores 200, irregular workpieces can be clamped. The adaptive adjustment of these clamping cores 200 allows them to conform to the workpiece's contours, achieving multi-point contact. If the workpiece surface has protrusions or depressions, the clamping cores 200 can automatically match the contour through extension and retraction, forming a wrap-around clamping mechanism. This enables auxiliary clamping of most irregular workpieces. However, the layout and force of the clamping cores 200 need to be optimized based on the specific shape of the workpiece, its machining accuracy, and the stress conditions. Combining other clamping methods may be necessary to ensure stable clamping.

Claims

1. A welding auxiliary fixture suitable for irregular workpieces, comprising an auxiliary clamping fixture (1), characterized in that: The auxiliary clamping fixture (1) is equipped with clamping mechanism A (2), clamping mechanism B (21) and clamping mechanism C (22). Clamping mechanism A (2) is evenly provided with multiple sets of clamping cores (200). A guide seat (6) is fixedly provided at the bottom of clamping mechanism A (2). A receiving hole (5) is opened on the surface of the auxiliary clamping fixture (1). The guide seat (6) is located inside the receiving hole (5). A guide rail (4) is opened at the bottom of the receiving hole (5). A positioning plate (64) is fixedly provided at the bottom of the auxiliary clamping fixture (1). A cylinder (63) is fixedly installed on the positioning plate (64).

2. The welding auxiliary fixture for irregular workpieces according to claim 1, characterized in that: The auxiliary clamping fixture (1) is a circular structure made of metal. Three sets of arc-shaped notches are evenly opened on the outer circumference of the auxiliary clamping fixture (1), and three sets of support seats (3) are evenly fixed at the bottom of the auxiliary clamping fixture (1).

3. The welding auxiliary fixture for irregular workpieces according to claim 1, characterized in that: The clamping mechanisms A (2), B (21) and C (22) are centrally symmetrical about the central axis of the auxiliary clamping fixture (1). The clamping mechanisms A (2), B (21) and C (22) are synchronously driven by three sets of cylinders (63) fixedly installed on the positioning plate (64).

4. The welding auxiliary fixture for irregular workpieces according to claim 3, characterized in that: The clamping mechanism A (2) is slidably disposed inside the two sets of guide seats (6) at the bottom. The cross sections of the guide seats (6) and the guide rails (4) are set as isosceles trapezoids. A connecting column is fixedly disposed at the bottom of each of the two sets of guide seats (6), and a connecting piece (61) is fixedly disposed at the bottom of the connecting column.

5. The welding auxiliary fixture for irregular workpieces according to claim 4, characterized in that: The bottom of the clamping mechanism A (2) is fixed by a guide seat (6), a connecting column and a connecting piece (61). The connecting column is inserted inside the guide rail (4). The bottom of the connecting piece (61) is fixedly connected to a fixing seat (62). The end of the fixing seat (62) is fixed to the piston rod of the cylinder (63).

6. The welding auxiliary fixture for irregular workpieces according to claim 1, characterized in that: The clamping core (200) includes a support cylinder (2001), a compression spring (2002), a limiting seat (2003), and a clamping rod (2004). The end of the support cylinder (2001) is fixedly connected to the inner wall of the clamping mechanism A (2). The compression spring (2002) is fixedly installed inside the support cylinder (2001). The limiting seat (2003) is slidably installed on the upper side inside the support cylinder (2001). The clamping rod (2004) is fixedly installed on the top of the limiting seat (2003). The outer corner of the top of the clamping rod (2004) is rounded. The compression spring (2002) is installed between the limiting seat (2003) and the bottom plate of the support cylinder (2001). The axial cross-section of the support cylinder (2001), the limiting seat (2003), and the clamping rod (2004) is a concentric circle structure.

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