A precise positioning device for welding a ball

Abstract

The utility model provides a kind of welding ball coordinate accurate positioning device, belong to welding ball technical field, the welding ball coordinate accurate positioning device includes positioning base, positioning arm and globular clamping assembly;The positioning base is fan-shaped plate structure, the fan-shaped center of the positioning base is equipped with central through-hole, one end of the positioning arm is inserted into the central through-hole and is hinged with the positioning base articulated connection, for supporting positioning arm rotation activity around the central through-hole axis of positioning base;The positioning arm is slender pole structure, the other end of the positioning arm is fixedly connected the globular clamping assembly, the globular clamping assembly includes several clamping claws that are annular array distribution, the inside surface of the clamping claw is the concave arc surface matched with the outer surface of welding ball;The utility model can solve the technical problems that welding ball is prone to positional deviation or rotation in hoisting and positioning process when three-dimensional space coordinate positioning is carried out to welding ball.

Description

Technical Field

[0001] This utility model belongs to the field of welding ball technology, and more specifically, relates to a welding ball coordinate precision positioning device. Background Technology

[0002] In the construction of large steel space frame buildings, the welded sphere, as the core connecting component of the space frame node, directly affects the geometry, stress performance, and construction quality of the entire space frame structure due to the accuracy of its spatial coordinates. Therefore, accurate three-dimensional spatial positioning of the welded sphere is a key technical aspect of space frame construction. Currently, the commonly used positioning methods in engineering practice mainly include total station measurement positioning, guy wire intersection positioning, and simple support positioning. Although the total station measurement positioning method has high accuracy, it is expensive, complex to operate, requires the cooperation of professional surveyors, and has low measurement efficiency in complex construction site environments and when visibility is obstructed. The guy wire intersection positioning method determines the position of the welded sphere by forming a spatial intersection point by pulling multiple steel wires taut from different directions, but the position of the steel wires is subject to tension. During the pulling process, elastic deformation and sagging occur, affecting positioning accuracy, and the adjustment process is cumbersome and time-consuming. The simple bracket positioning method uses temporary welded or bolted steel pipe brackets to fix the welded ball in the predetermined position, but the bracket structure is bulky, inconvenient to install and disassemble, and the clamping of the welded ball mostly adopts point contact or rigid fixation, which can easily cause damage to the surface of the welded ball or positional displacement due to uneven clamping force. These existing positioning methods are all insufficient in terms of positioning accuracy, ease of operation, clamping stability and equipment versatility, and cannot meet the technical requirements of high-precision and high-efficiency positioning of welded balls in modern large-scale space frame projects. There is an urgent need to develop a special positioning device that is simple in structure, easy to operate, accurate in positioning and can stably clamp welded balls of different sizes. Utility Model Content

[0003] In view of this, the present invention provides a precise positioning device for welding ball coordinates, which can solve the technical problem that welding balls are prone to positional shift or rotation during hoisting and positioning when performing three-dimensional spatial coordinate positioning of welding balls.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a precise positioning device for welding spheres, comprising a positioning base, a positioning arm, and a sphere clamping assembly. The positioning base is a fan-shaped plate structure with a central through hole at the center of the fan. One end of the positioning arm passes through the central through hole and is hinged to the positioning base via a damping hinge, supporting the rotational movement of the positioning arm around the axis of the central through hole of the positioning base. The positioning arm is a slender rod structure, with the other end of the positioning arm fixedly connected to the sphere clamping assembly. The sphere clamping assembly includes several clamping claws arranged in a circular array, and the inner surface of each clamping claw is a concave arc surface that matches the outer surface of the welding sphere.

[0006] The technical effects of the precise positioning device for welded sphere coordinates provided by this utility model are as follows: The fan-shaped plate structure of the positioning base, combined with the central through hole, allows the positioning arm to rotate and adjust within space around the pin shaft, achieving horizontal angular positioning of the welded sphere; simultaneously, the annular array of clamping claws in the sphere clamping assembly allows multiple clamping claws to act on the surface of the welded sphere from different directions, forming stable multi-point support through surface contact between the concave arc surface and the outer surface of the sphere, effectively dispersing the clamping force and avoiding local indentations or deformation on the surface of the welded sphere. This ensures the precise and stable position of the welded sphere in three-dimensional space, meeting the high-precision requirements for welded sphere coordinate positioning in steel structure grid construction.

[0007] Based on the above technical solution, the welding spherical coordinate precise positioning device of this utility model can be further improved as follows:

[0008] Wherein, the depth of the concave arc surface of the clamping claw along the radial direction of the welding ball is greater than the width of the clamping claw along the tangential direction of the annular array.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the structural design of the concave arc surface of the clamping claw having a radial depth greater than its tangential width increases the envelope range of the clamping claw on the welding ball, increases the effective contact area between the concave arc surface and the ball surface, and improves the stability and reliability of clamping; at the same time, this depth advantage allows the clamping claw to better restrict the radial displacement of the welding ball when subjected to external disturbances, preventing the welding ball from shaking or falling off in the clamping state, and further improving the anti-interference ability and positioning accuracy of the positioning device in the actual construction environment.

[0010] Optionally, the positioning arm is provided with a scale marking segment near the ball clamping assembly, and the scale marking segment is evenly distributed along the length direction of the positioning arm.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting a scale mark section near the ball clamping component of the positioning arm and making the scale spacing evenly distributed provides construction personnel with an intuitive length measurement benchmark, making it easy to quickly read the extension length of the positioning arm or the distance between the ball clamping component and the reference point; the setting of this scale mark enables the positioning device to quickly return to the preset position according to the scale when repeatedly positioning, reducing measurement errors and human judgment errors, significantly improving construction efficiency and positioning repeatability accuracy, and is particularly suitable for large-scale space frame projects that require batch positioning of multiple welded balls.

[0012] Optionally, the gripping claws have a fan-shaped plate structure, with the outer surface of each gripping claw being a plane and the inner surface being a concave arc surface.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The clamping claw adopts a fan-shaped plate structure with a flat outer surface and a concave arc surface on the inner surface, giving the clamping claw a clear geometric shape, which is convenient for processing, manufacturing and quality control; The fan-shaped plate structure reduces the weight of the clamping claw itself while ensuring sufficient strength, thereby reducing the overall mass of the ball clamping assembly, which reduces the load on the positioning arm and makes the positioning arm more flexible and convenient to rotate and adjust; At the same time, the flat outer surface facilitates the installation of connecting parts, while the concave arc surface on the inner surface precisely matches the curvature of the welding ball, achieving a unity of structural simplification and functional optimization.

[0014] Optionally, the sphere clamping assembly has three clamping claws, which are evenly distributed at 120° on the circumference.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The ball clamping assembly adopts a configuration of three clamping claws evenly distributed at 120°, forming a stable three-point support structure, which conforms to the principle of three points determining a plane in statics, so that the welding ball has the best mechanical balance in the clamping state; This uniform distribution ensures that the clamping force applied by each clamping claw to the welding ball is equal in magnitude and symmetrical in direction, avoiding the displacement or rotation of the welding ball caused by uneven clamping force. At the same time, the configuration of three clamping claws simplifies the structure, reduces manufacturing costs and device weight, and improves practicality and economy while meeting the clamping stability requirements.

[0016] Optionally, each gripper is connected to the end of the positioning arm via a spring connecting rod, one end of which is fixed to the connecting plate at the end of the positioning arm, and the other end is fixed to the outer surface of the gripper.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By connecting the clamping claw and the end of the positioning arm through the spring connecting rod, the elastic deformation characteristics of the spring provide a continuous and uniform clamping force for the clamping claw, enabling the ball clamping assembly to adapt to welding balls of different diameters and enhancing the versatility of the device; the buffering effect of the spring connecting rod avoids the impact force that may be generated by the rigid connection from damaging the surface of the welding ball, and at the same time, when the welding ball is thermally expanded or undergoes slight displacement due to external force, the spring can maintain the stability of the clamping force through its own extension and contraction, preventing clamping failure, and significantly improving the reliability and adaptability of the positioning device under complex construction conditions.

[0018] Optionally, the positioning base has multiple positioning holes on its fan-shaped outer arc edge, which are evenly distributed along the fan-shaped arc direction for inserting positioning pins to achieve angle locking.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: multiple equally spaced positioning holes are set on the fan-shaped outer arc edge of the positioning base, which, together with the positioning pin, realize the angle locking function, providing a reliable fixing method for the positioning arm after rotation adjustment, preventing the positioning arm from rotating unexpectedly due to its own weight or external force; the equally spaced positioning holes allow the angle adjustment to have a fixed step interval, making it convenient for construction personnel to accurately position according to the predetermined angle, avoiding the randomness and uncertainty in continuous adjustment; this discrete angle locking mechanism simplifies the operation process, improves positioning efficiency, and at the same time ensures the consistency and repeatability of angles during multiple positioning.

[0020] Optionally, the positioning base is made of aluminum alloy.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The positioning base is made of aluminum alloy, which makes full use of the material characteristics of aluminum alloy, such as low density, high strength and corrosion resistance. While ensuring that the positioning base has sufficient rigidity and load-bearing capacity, the overall weight of the device is greatly reduced, making the positioning device easy to transport and install; the good machinability of aluminum alloy makes it easy to perform machining such as drilling and milling on the positioning base, ensuring the dimensional accuracy of the central through hole and positioning hole; at the same time, the surface of aluminum alloy is easy to be anodized and other protective treatments, which improves the durability and service life of the positioning base in the complex environment of the construction site.

[0022] Optionally, the positioning arm is a hollow cylindrical structure, and the wall thickness of the positioning arm is less than one-tenth of the outer diameter of the positioning arm.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The positioning arm adopts a hollow cylindrical structure with a wall thickness of less than one-tenth of the outer diameter. This thin-walled hollow design minimizes the self-weight of the positioning arm while meeting the bending stiffness requirements, reduces the moment of inertia of the positioning arm during rotation, and makes the angle adjustment of the positioning arm more effortless and flexible. Compared with a solid rod, the hollow cylindrical structure has a higher cross-sectional moment of inertia to mass ratio, achieving the goal of lightweighting under the same strength conditions. At the same time, the cylindrical shape reduces the air resistance experienced by the positioning arm during rotation, improving the smoothness of operation and positioning response speed.

[0024] Optionally, the concave surface of the gripping claw is uniformly distributed with anti-slip textures, which are strip-shaped protrusions extending radially along the gripping claw, and the spacing between adjacent strip-shaped protrusions is equal.

[0025] The beneficial effects of the above-mentioned improvement scheme are as follows: anti-slip textures are evenly distributed on the concave arc surface of the clamping claws, and the friction coefficient between the concave arc surface and the surface of the welding ball is increased by the radially extending strip-shaped protrusions, which effectively prevents the welding ball from sliding or rotating due to vibration, tilting or external force during clamping; the radial arrangement of the strip-shaped protrusions ensures that the anti-slip effect is evenly distributed in all directions, avoiding local slippage; the equal spacing of adjacent strip-shaped protrusions ensures the consistency of the anti-slip textures, making the friction force of each clamping claw on the welding ball balanced, further improving the stability and reliability of clamping, and ensuring that the welding ball always maintains the preset spatial coordinate position during the positioning process.

[0026] Compared with existing technologies, the beneficial effects of the welding ball coordinate precision positioning device provided by this utility model are as follows: This utility model establishes a complete three-dimensional spatial positioning system through the hinged rotation structure of the positioning base and the positioning arm, combined with the multi-claw annular layout of the ball clamping assembly, fundamentally solving the technical problem of insufficient positioning accuracy of the welding ball; the rotation adjustment function of the positioning arm around the central through hole of the positioning base realizes precise control of the horizontal angle; the three-point uniform clamping method of the ball clamping assembly ensures the spatial stability of the welding ball; the surface contact design of the concave arc surface of the clamping claw and the surface of the ball avoids stress concentration and surface damage that may be caused by point contact or line contact; the setting of the scale marking section provides rapid positioning. The visual reference and the angle locking mechanism of the positioning holes and positioning pins ensure the accuracy and repeatability of the positioning angle; the application of the spring connecting rod enables the clamping force to be adaptively adjusted, solving the problem of universal clamping of welding balls of different sizes; the lightweight design of the aluminum alloy positioning base and the hollow round tube positioning arm significantly reduces the weight of the device and improves the operational flexibility; the anti-slip texture design further enhances the clamping reliability; the whole device has a simple structure, is easy to operate, has accurate positioning, and strong adaptability. Compared with the existing technology, it has significant technological progress and can effectively improve the accuracy and efficiency of welding ball positioning in steel structure space frame construction, reduce construction costs and safety risks, and is particularly suitable for the high-precision positioning requirements of large and complex space frame projects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A front view of a welding spherical coordinate precision positioning device;

[0029] Figure 2 A top view of a welding spherical coordinate precise positioning device;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Positioning base; 11. Central through hole; 12. Positioning hole; 20. Positioning arm; 30. Ball clamping assembly; 31. Clamping claw; 32. Concave arc surface; 40. Spring connecting rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1-2 The image shows an embodiment of a precise positioning device for welding spheres provided by this utility model. In this embodiment, it includes a positioning base 10, a positioning arm 20, and a ball clamping assembly 30. The positioning base 10 is a fan-shaped plate structure with a central through hole 11 at the center of the fan shape. One end of the positioning arm passes through the central through hole and is hinged to the positioning base via a damping hinge to support the rotation of the positioning arm around the axis of the central through hole of the positioning base. The positioning arm 20 is a slender rod structure with the other end of the positioning arm fixedly connected to the ball clamping assembly 30. The ball clamping assembly includes several clamping claws 31 arranged in a circular array. The inner surface of the clamping claws is a concave arc surface 32 that matches the outer surface of the welding ball.

[0034] This device is used for three-dimensional spatial positioning of welded spheres during the construction of steel structure space frames.

[0035] In the above technical solution, the depth of the concave arc surface of the clamping claw along the radial direction of the welding ball is greater than the width of the clamping claw along the tangential direction of the annular array.

[0036] Optionally, in the above technical solution, a scale marking segment is provided on the positioning arm near the ball clamping assembly, and the scale spacing of the scale marking segment is evenly distributed along the length direction of the positioning arm.

[0037] Optionally, in the above technical solution, the gripping claws are fan-shaped plate structures, with the outer surface of each gripping claw being a plane and the inner surface being a concave arc surface.

[0038] Optionally, in the above technical solution, the number of clamping claws in the ball clamping assembly is 3, which are evenly distributed on the circumference at 120°.

[0039] Optionally, in the above technical solution, each gripper is connected to the end of the positioning arm via a spring connecting rod 40, one end of which is fixed to the connecting plate at the end of the positioning arm, and the other end is fixed to the outer surface of the gripper.

[0040] Optionally, in the above technical solution, the fan-shaped outer arc edge of the positioning base is provided with multiple positioning holes, which are evenly distributed along the fan-shaped arc direction for inserting positioning pins to achieve angle locking.

[0041] Optionally, in the above technical solution, the positioning base is made of aluminum alloy.

[0042] Optionally, in the above technical solution, the positioning arm is a hollow cylindrical structure, and the wall thickness of the positioning arm is less than one-tenth of the outer diameter of the positioning arm.

[0043] Optionally, in the above technical solution, anti-slip textures are evenly distributed on the concave arc surface of the gripping claw. The anti-slip textures are strip-shaped protrusions extending radially along the gripping claw, and the spacing between adjacent strip-shaped protrusions is equal.

[0044] First, determine the three-dimensional spatial coordinates of the ball to be welded according to the space frame design drawings, including the horizontal angle and radial distance parameters. Fix the positioning base onto the already positioned space frame support structure or temporary bracket, ensuring the fan-shaped plane of the positioning base is horizontal and the axis of the central through hole is vertically downward. Insert one end of the positioning arm into the central through hole of the positioning base, and use a pin to complete the hinge connection between the positioning arm and the central through hole, checking that the positioning arm can rotate smoothly around the pin. According to the horizontal angle required by the design drawings, rotate the positioning arm to the corresponding angle. By observing the position of the positioning hole on the outer arc edge of the fan-shaped base, select the positioning hole corresponding to the target angle, insert the positioning pin into the positioning hole, and lock the horizontal angle of the positioning arm. Adjust the extension length of the positioning arm according to the radial distance required by the design, and read the position of the positioning arm. The scale value of the graduated segment determines whether the extension distance meets the requirements; move the welding ball to be positioned to the position of the ball clamping assembly, so that the surface of the welding ball contacts the concave arc surface of each clamping claw. At this time, the spring connecting rod automatically adjusts to make each clamping claw evenly clamp the welding ball, forming a stable three-point support; check whether the welding ball is firmly clamped, and gently push the welding ball to verify its positional stability; after confirming that the welding ball is accurately positioned, proceed with the subsequent steel pipe connection or welding operation; after the operation is completed, remove the positioning pin to release the positioning arm angle lock, rotate the positioning arm to move the ball clamping assembly away from the welding ball, and release the welding ball by gently pulling open the clamping claws, completing the positioning operation of one welding ball; for construction tasks that require positioning multiple welding balls, repeat the above operation steps, adjusting the positioning arm angle and extension length each time according to the new coordinate parameters.

[0045] The following is a specific embodiment 1 of this utility model: This embodiment provides a specific device for positioning a welding ball with a diameter of 150mm. The positioning base is made of 8mm thick aluminum alloy 6061 plate. The positioning base has a fan-shaped structure with a central angle of 90° and a radius of 200mm. A central through hole with a diameter of 25mm is opened at the center of the fan. The edge of the central through hole is chamfered to facilitate the insertion and rotation of the positioning arm. A positioning hole with a diameter of 6mm is opened every 10° along the arc direction of the outer arc edge of the fan-shaped positioning base, for a total of 9 positioning holes. The depth of the positioning holes is 1. 0mm; The positioning arm is made of 304 stainless steel round tube with an outer diameter of 20mm and a wall thickness of 1.5mm. The total length of the positioning arm is 800mm. One end of the positioning arm is machined with a 24mm diameter and 30mm long insertion section. A 5mm wide pin hole is opened on the surface of the insertion section. After the insertion section is inserted into the central through hole of the positioning base, a 5mm diameter stainless steel pin is used to pass through the central through hole of the positioning base and the pin hole of the positioning arm insertion section to complete the hinge connection. The other end of the positioning arm is welded to a circular connecting plate with a diameter of 80mm and a thickness of 5mm. The positioning arm is located at a distance from the ball clamping assembly. Starting at a position 300mm from the end, a circular scale line is etched every 10mm along the length of the positioning arm. The scale line is 0.5mm wide and 0.3mm deep, for a total of 30 scale lines forming the scale marking segment. The ball clamping assembly includes three clamping claws, each made of 6mm thick 45# steel sheet by stamping. The clamping claws have a fan-shaped plate structure with a central angle of 80 degrees and a radius of 60mm. The inner surface of the clamping claws is machined into a concave arc surface with a radius of 76mm. The radius of this concave arc surface is slightly larger than the radius of the welding ball to facilitate the insertion of the welding ball. The radial depth of the concave arc surface is 12mm. The tangential width is 8mm; five radially milled, equally spaced, strip-shaped protrusions, each 0.8mm deep and 1mm wide, are milled on the concave surface of the gripping claws as anti-slip textures, with a spacing of 2mm between adjacent protrusions; a spring connecting rod is welded to the center of the outer side of each gripping claw, the spring connecting rod being a tension spring made of 4mm diameter stainless steel wire, with a free length of 40mm and a spring stiffness coefficient of 0.5N per mm; the other end of the spring connecting rod is fixed to the circumference of the connecting plate, and the fixing points of the three gripping claws are evenly distributed at 120° on the circumference of the connecting plate; the locating pins are made of 5mm diameter...Made of 8mm thick, 25mm long stainless steel cylindrical pins, with a T-shaped handle machined at one end for easy insertion and removal. When using this device, the positioning base is bolted to the operating platform used for space frame construction. The positioning arm angle is adjusted to 40° according to the design coordinates of the welding ball and inserted into the corresponding positioning hole for locking. The extension length of the positioning arm is adjusted to the 500mm position indicated on the scale. The 150mm diameter welding ball is placed in the ball clamping assembly. The concave surfaces of each clamping claw automatically conform to the surface of the welding ball. The clamping force provided by the spring connecting rod is approximately 15N, and the welding ball is stably clamped in the predetermined position. After positioning, the steel pipe is butt-welded. During welding, the position of the welding ball remains stable without displacement. After welding, the positioning pin is pulled out and the positioning arm is rotated to release the welding ball.

[0046] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and the scale marking section of the positioning arm is improved to laser-engraved digital scale. Arabic numerals with an engraving depth of 0.5mm and a height of 3mm are added to the original circular scale line. The distance value is marked every 50mm. The numbers are filled with red wear-resistant paint, making the scale reading clearer and more accurate. At the same time, angle marking stickers are pasted on the inner surface of the fan-shaped positioning base, and the corresponding angle value is marked near each positioning hole. The angle markings are made of weather-resistant polyester film material, and the font height is 5mm, which makes it easy for construction personnel to quickly identify and select the correct positioning hole. This improvement allows operators to directly read angle and distance parameters without the need to use a protractor or measuring tools, which significantly improves the positioning speed and accuracy. It is especially suitable for batch construction scenarios that require frequent changes of positioning coordinates. In actual applications, the positioning efficiency is improved by about 30 percentage points, and operators report a significant improvement in user experience.

[0047] The following is another specific embodiment 3 of this utility model: This embodiment 3 is based on embodiment 1, and a fine-tuning mechanism is added to the center of the connecting plate of the ball clamping assembly. The fine-tuning mechanism consists of an adjusting screw with a diameter of 15mm and a pitch of 2mm and a matching nut. The adjusting screw is vertically installed at the center of the connecting plate and extends towards the ball. A circular pressure plate with a diameter of 30mm is installed at the end of the adjusting screw. The surface of the pressure plate is covered with a rubber buffer pad with a thickness of 3mm. After the welding ball is initially clamped by the clamping claw, the adjusting screw is rotated so that the pressure plate gently abuts against the surface of the welding ball. The position of the welding ball is finely adjusted at the micron level through the tiny feed of the screw. Each rotation of the adjusting screw changes the position of the welding ball by 2mm. This improvement adds a precision fine-tuning function to the positioning device, so that the welding ball can be accurately corrected after coarse positioning. It is particularly suitable for special grid structures with extremely high positioning accuracy requirements. The adjusting screw is made of stainless steel to ensure durability, and the rubber buffer pad prevents the pressure plate from directly contacting the surface of the welding ball and causing damage.

[0048] Specifically, the principle of this utility model is as follows: This device adopts a combined positioning principle of multi-point balanced clamping of the ball clamping assembly and the positioning base with hinged rotation. The fan-shaped plate structure and central through hole of the positioning base provide a stable support reference and rotation center for the positioning arm. The positioning arm is hinged to the positioning base through a pin to achieve circumferential rotation around the axis of the central through hole. This rotation mechanism allows the positioning arm to adjust its angle within a 360° range in the horizontal plane, thereby achieving precise positioning of the welding ball in the horizontal direction. The positioning holes on the outer arc edge of the fan-shaped positioning base cooperate with the positioning pins to convert the continuous rotational motion into discrete angle locking positions. By controlling the spacing of the positioning holes and The angle adjustment step value can be precisely set to ensure that the positioning arm can reliably lock after being adjusted to the predetermined angle, preventing angle drift. The ball clamping assembly adopts a three-point support structure with three clamping claws evenly distributed at 120°. According to the principle of spatial geometry, three non-collinear points can uniquely determine the position of a ball in space. This three-point clamping method subjectes the welding ball to clamping forces from three symmetrical directions, forming a stable mechanical equilibrium state. The concave arc surface on the inner side of the clamping claw matches the curvature of the outer surface of the welding ball, realizing surface contact rather than point or line contact, significantly increasing the contact area, reducing contact stress, and avoiding damage to the surface of the welding ball caused by local stress concentration. The design, with a radial depth greater than the tangential width, enhances the gripper's ability to envelop the weld ball, improving gripping stability. A spring connecting rod connects the gripper to the end of the positioning arm. Utilizing the elastic potential energy storage and release characteristics of the spring, the gripping force can be automatically adjusted according to slight differences in the weld ball diameter. When the weld ball diameter is slightly larger, the spring is stretched to generate a greater gripping force; when the diameter is slightly smaller, the spring retracts to maintain a basic gripping force. This adaptive adjustment mechanism solves the problem of rigid gripping devices being incompatible with weld balls of different sizes. The graduated markings on the positioning arm provide a visual measurement benchmark for the arm's extension length. Combined with the angle locking function of the positioning base, construction personnel can read the graduations... The device quickly positions the welding ball to the specified three-dimensional spatial coordinates by selecting the positioning hole position. The lightweight design of the aluminum alloy positioning base and hollow round tube positioning arm reduces the overall weight and rotational inertia of the device, reduces the operating force required for the positioning arm rotation adjustment, and improves positioning efficiency. The anti-slip texture on the concave arc surface of the clamping claw further prevents the welding ball from sliding or rotating in the clamping state by increasing the friction coefficient, ensuring the long-term stability of the positioning position. The entire device achieves precise positioning and stable clamping of the welding ball's three-dimensional spatial coordinates through the ingenious combination of mechanical structures, without the need for complex electronic equipment or measuring instruments. It has the technical characteristics of simple structure, clear principle, intuitive operation, and high reliability.

[0049] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A precise positioning device for welding spherical coordinates, characterized in that, The device includes a positioning base, a positioning arm, and a ball clamping assembly. The positioning base is a fan-shaped plate structure with a central through hole at the center of the fan. One end of the positioning arm passes through the central through hole and is hinged to the positioning base via a damping hinge to support the rotation of the positioning arm around the axis of the central through hole of the positioning base. The positioning arm is a slender rod structure, and the other end of the positioning arm is fixedly connected to the ball clamping assembly. The ball clamping assembly includes several clamping claws arranged in a circular array, and the inner surface of the clamping claws is a concave arc surface that matches the outer surface of the welding ball.

2. The welding spherical coordinate precise positioning device according to claim 1, characterized in that, The depth of the concave arc surface of the clamping claw along the radial direction of the welding ball is greater than the width of the clamping claw along the tangential direction of the annular array.

3. The welding spherical coordinate precise positioning device according to claim 2, characterized in that, The positioning arm is provided with a scale marking section near the ball clamping assembly, and the scale marking interval of the scale marking section is evenly distributed along the length direction of the positioning arm.

4. The welding spherical coordinate precise positioning device according to claim 3, characterized in that, The gripping claws have a fan-shaped plate structure, with the outer surface of each gripping claw being a flat surface and the inner surface being a concave arc surface.

5. The welding spherical coordinate precise positioning device according to claim 4, characterized in that, The ball clamping assembly has three clamping claws, which are evenly distributed at 120° on the circumference.

6. The welding spherical coordinate precise positioning device according to claim 5, characterized in that, Each gripper is connected to the end of the positioning arm via a spring connecting rod. One end of the spring connecting rod is fixed to the connecting plate at the end of the positioning arm, and the other end is fixed to the outer surface of the gripper.

7. The welding spherical coordinate precise positioning device according to claim 6, characterized in that, The positioning base has multiple positioning holes on its fan-shaped outer arc edge. These positioning holes are evenly distributed along the fan-shaped arc direction and are used to insert positioning pins to achieve angle locking.

8. The welding spherical coordinate precise positioning device according to claim 7, characterized in that, The positioning base is made of aluminum alloy.

9. A precise positioning device for welding spherical coordinates according to claim 8, characterized in that, The positioning arm is a hollow cylindrical structure, and the wall thickness of the positioning arm is less than one-tenth of the outer diameter of the positioning arm.

10. A precise positioning device for welding spherical coordinates according to claim 9, characterized in that, The gripping claw has anti-slip textures evenly distributed on its concave arc surface. The anti-slip textures are strip-shaped protrusions extending radially along the gripping claw, and the spacing between adjacent strip-shaped protrusions is equal.

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