Attached seam measuring device and method for thick plate welding

Abstract

The invention relates to the technical field of welding measuring devices, and discloses a thick plate welding abutted seam measuring device and measuring method.The thick plate welding abutted seam measuring device comprises a clamping frame and a pneumatic sliding rail fixed to the upper surface of the clamping frame, and the lower surface of the clamping frame is in threaded connection with three sets of threaded rods. By arranging a pneumatic sliding block, a rotating disc and a distance measuring sensor, the pneumatic sliding block drives the distance measuring sensor to slowly move backwards, and the rotating disc drives the distance measuring sensor to quickly move left and right through a crank rod, so that the distance measuring sensor synchronously collects three-dimensional data of an abutted seam area; measurement of three kinds of core parameters including the groove angle, the abutted seam distance and the surface flatness can be completed at a time by combining a computer algorithm, compared with traditional equipment which only measures a single parameter, repeated dismounting and debugging are not needed, abutted seam basic parameters can be obtained through edge point recognition and plane fitting, flatness detection can be achieved through datum plane deviation calculation, and the detection efficiency is greatly improved. Key indexes of thick plate welding quality control are covered, and the omnibearing detection requirement is met.

Description

Technical Field

[0001] This invention relates to the field of welding measurement device technology, specifically to a joint measurement device and method for thick plate welding. Background Technology

[0002] In fields such as engineering machinery and shipbuilding, thick plate welded structures are core load-bearing components. The bevel angle, spacing, and flatness of the joints directly determine the welding quality and equipment safety. For example, in welding Q355 steel thick plates, the bevel angle must be precisely controlled at 60°~70° and the joint gap at 3~4mm to ensure weld quality. Therefore, accurate measurement of joint parameters is a core aspect of thick plate welding quality control.

[0003] The current industry mainly relies on manual methods, which has obvious shortcomings. Manual inspection using calipers and protractors is extremely inefficient (it takes 2-3 people more than 40 minutes to measure a 3-meter seam). Furthermore, manual calipers cannot measure every data point of the seam and have large errors (bevel angle ±3°, spacing ±0.5mm). They are also prone to missing local defects. Semi-automatic equipment has a simple fixing method, and it is easy for it to shift when the surface of thick plates is uneven, causing the measurement benchmark to deviate. Most of them only measure a single parameter, which requires repeated measurements and makes it difficult to measure all the details of the seam comprehensively. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a joint measuring device and method for thick plate welding, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a joint measuring device for thick plate welding, comprising a clamping frame and a pneumatic slide rail fixed to the upper surface of the clamping frame. Three sets of threaded rods are threadedly connected to the lower surface of the clamping frame. A clamping disc is rotatably connected to the top of each threaded rod, and a knob is fixedly connected to its bottom. A pneumatic slider is slidably connected to the outer surface of the pneumatic slide rail. An L-shaped moving stage is fixedly connected to the upper surface of the pneumatic slider. A U-shaped frame is fixedly connected to the right side of the L-shaped moving stage. A sliding groove is provided inside the U-shaped frame. A floating stage is slidably connected to the inner wall of the sliding groove. A calibration plate is slidably inserted into the middle of the upper surface of the floating stage. Two sets of sliding rods are slidably inserted into the outer surface of the floating stage. The two ends of each sliding rod are fixedly connected to the U-shaped frame and the L-shaped moving stage, respectively. Next, a spring is fitted on the right side of the outer surface of the sliding rod; a connecting arm is fixedly connected to the front of the floating platform; a motor bracket is fixedly connected to the right side of the outer surface of the connecting arm; a drive motor is fixedly connected to the inner wall of the motor bracket; a rotating shaft is fixedly connected to the output end of the drive motor; a rotating disk is fixedly connected to the outer surface of the rotating shaft; a rotating pin is fixedly connected to the rear side of the outer surface of the rotating disk; a fixed guide rail is fixedly connected to the upper surface of the connecting arm; a ball block is slidably connected to the outer surface of the fixed guide rail; a sliding platform is fixedly connected to the upper surface of the ball block; a fixed pin is fixedly connected to the upper surface of the sliding platform; a crank is rotatably connected between the fixed pin and the rotating pin; a distance sensor is installed on the outer surface of the sliding platform; and two sets of welding plates are provided on the inner side of the clamping frame.

[0006] Preferably, reinforcing ribs are fixedly connected to both the front and rear sides of the upper surface of the U-shaped frame, and the left side of the reinforcing ribs is fixedly connected to the right side of the L-shaped moving platform.

[0007] Preferably, the outer surface of the sliding rod is slidably fitted with two sets of stabilizing collars, and the inner side of the stabilizing collars is fixedly connected to the outer surface of the floating platform.

[0008] Preferably, a support block is fixedly connected to the right side of the front of the U-shaped frame, and a support groove is provided on the outer surface of the connecting arm for the support block to slide.

[0009] Preferably, a connecting key is fixedly connected to the top end of the rotating shaft, and a keyway adapted to the connecting key is opened on the outer surface of the rotating disk.

[0010] Preferably, a shaft bracket is rotatably connected to the outer surface of the rotating shaft, and the back of the shaft bracket is fixedly connected to the inner wall of the motor bracket.

[0011] Preferably, a docking block is fixedly connected to the front of the floating platform, a docking groove adapted to the docking block is opened on the back of the connecting arm, two sets of connecting bolts are inserted between the connecting arm and the docking block, and nuts are threaded to the rear end of the connecting bolts.

[0012] Preferably, the top inner wall of the clamping frame and the upper surface of the clamping plate are both fixedly connected with anti-slip pads, the anti-slip pads are made of rubber, and the outer surface of the anti-slip pads is provided with anti-slip texture.

[0013] Preferably, the outer surfaces of both the rotating pin and the fixed pin are provided with ball bearings, and the rotating pin and the fixed pin are rotatably connected to the crank rod through the ball bearings.

[0014] A joint measuring device and method for thick plate welding, comprising the following steps: Step 1: Place the clamping frame on the side of one of the welding plates near the weld seam, tighten the knob, the knob will drive the threaded rod and clamping plate to rotate, and the clamping plate will fix the clamping frame on the outer surface of the welding plate.

[0015] Step 2: Place the calibration ruler between the two sets of welding plates, and push the floating table with the spring so that the calibration ruler is close to the seam side of the welding plates. Step 3: Simultaneously start the pneumatic slider and drive motor. The pneumatic slider drives the L-shaped moving platform to move to the right, and the output of the drive motor drives the rotating shaft to rotate. Step 4: The rotating shaft drives the rotating disk and rotating pin to rotate, and the rotating pin drives the sliding table and ball slider to move linearly left and right through the crank. Step 5: Turn on the distance sensor. The distance sensor moves quickly left and right above the joint of the two sets of welding plates, while slowly moving backward. The distance sensor records the protrusion height at the joint of the two sets of welding plates over time. The distance sensor exports the data and records the spatial coordinates corresponding to the acquisition time, thereby measuring the bevel angle and spacing at various points on the two sets of welding plates.

[0016] Compared with the prior art, the present invention provides a joint measuring device and method for thick plate welding, which has the following advantages: 1. The joint measurement device and method for thick plate welding utilizes a pneumatic slider, a rotating disk, and a distance sensor. The pneumatic slider drives the distance sensor to move slowly backward, while the rotating disk drives the distance sensor to move rapidly left and right via a crank. This allows the distance sensor to simultaneously collect three-dimensional data of the joint area. Combined with computer algorithms, it can simultaneously measure three core parameters: bevel angle, joint spacing, and surface flatness. Compared to traditional equipment that only measures a single parameter, it eliminates the need for repeated disassembly and debugging. It can obtain basic joint parameters through edge point recognition and plane fitting, and achieve flatness detection through reference plane deviation calculation, covering key indicators for thick plate welding quality control and meeting comprehensive inspection needs.

[0017] 2. The joint measuring device and method for thick plate welding, through the open structure of the clamping frame, can be directly clamped to the edge of the welding plate. The threaded rod can be driven to lift and lower the clamping plate by rotating the knob. Stable fixation can be completed without professional tools, and the overall installation and debugging can be completed within five minutes. The connecting arm and the floating table can be quickly connected through the docking block and connecting bolts, which reduces the installation difficulty and is suitable for complex on-site working environments.

[0018] 3. The joint measuring device and method for thick plate welding utilizes a floating stage and spring to form an elastic compensation structure. The continuous elastic force of the spring pushes the floating stage to adaptively adjust its position along the sliding rod, ensuring that the calibration plate always fits against the edge of the welded plate joint, thereby calibrating the measurement reference of the ranging sensor throughout the entire process. Even if there are undulations on the surface of the thick plate, this structure can compensate for positional deviations in real time, ensuring the continuity and accuracy of the sensor's data acquisition and avoiding the local measurement distortion problem caused by the fixed reference of traditional equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the joint measuring device for thick plate welding proposed in this invention. Figure 2 , Figure 3 This is a partial structural schematic diagram of a joint measuring device for thick plate welding proposed in this invention. Figure 4 , Figure 5 , Figure 6 , Figure 7 This is a schematic diagram of the unfolded structure of a joint measuring device for thick plate welding proposed in this invention. In the diagram: 1. Clamping frame; 2. Pneumatic slide rail; 3. Threaded rod; 4. Clamping plate; 5. Pneumatic slider; 6. L-shaped moving stage; 7. U-shaped frame; 701. Sliding groove; 702. Support block; 8. Floating stage; 801. Connecting block; 9. Calibration plate; 10. Sliding rod; 11. Spring; 12. Connecting arm; 1201. Supporting slide groove; 1202. Connecting groove; 13. Motor bracket; 14. Drive motor; 15. Rotating shaft; 16. Rotating disk; 17. Rotating pin; 18. Fixed guide rail; 19. Ball slider; 20. Sliding stage; 21. Fixed pin; 22. Crank rod; 23. Distance sensor; 24. Welding plate; 25. Shaft bracket; 26. Connecting bolt; 27. Nut; 28. Knob. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-7This invention provides a technical solution: a joint measuring device for thick plate welding, comprising a clamping frame 1 and a pneumatic slide rail 2 fixed to the upper surface of the clamping frame 1. Three sets of threaded rods 3 are threadedly connected to the lower surface of the clamping frame 1. A clamping disc 4 is rotatably connected to the top of each threaded rod 3, and a knob 28 is fixedly connected to its bottom. A pneumatic slider 5 is slidably connected to the outer surface of the pneumatic slide rail 2. An L-shaped moving platform 6 is fixedly connected to the upper surface of the pneumatic slider 5. A U-shaped frame 7 is fixedly connected to the right side of the L-shaped moving platform 6. A sliding groove 701 is opened inside the U-shaped frame 7. A floating platform 8 is slidably connected to the inner wall of the sliding groove 701. The function of the floating platform 8 is to allow the overall coordinates of the ranging sensor 23 to flow along the edge of the joint of one set of welding plates 24. The upper surface of the floating platform 8... A calibration plate 9 is slidably inserted in the middle. The calibration plate 9 is designed to be extendable vertically to prevent the fixed-length calibration plate 9 from being stuck on the ground, allowing the device to measure welding plates 24 of different thicknesses within a certain range. Two sets of sliding rods 10 are slidably inserted on the outer surface of the floating stage 8. The two ends of the sliding rods 10 are fixedly connected to the U-shaped frame 7 and the L-shaped moving stage 6, respectively. A spring 11 is fitted on the right side of the outer surface of the sliding rods 10. A connecting arm 12 is fixedly connected to the front of the floating stage 8. A motor bracket 13 is fixedly connected to the right side of the outer surface of the connecting arm 12. A drive motor 14 is fixedly connected to the inner wall of the motor bracket 13. A rotating shaft 15 is fixedly connected to the output end of the drive motor 14. A rotating disk 1 is fixedly connected to the outer surface of the rotating shaft 15. 6. A rotating pin 17 is fixedly connected to the rear side of the outer surface of the rotating disk 16. A fixed guide rail 18 is fixedly connected to the upper surface of the connecting arm 12. A ball bearing slider 19 is slidably connected to the outer surface of the fixed guide rail 18. A sliding table 20 is fixedly connected to the upper surface of the ball bearing slider 19. A fixed pin 21 is fixedly connected to the upper surface of the sliding table 20. A crank 22 is rotatably connected between the fixed pin 21 and the rotating pin 17. A distance sensor 23 is mounted on the outer surface of the sliding table 20. Two sets of welding plates 24 are provided on the inner side of the clamping frame 1. By setting up the pneumatic slider 5, the rotating disk 16 and the distance sensor 23, the pneumatic slider 5 drives the distance sensor 23 to move slowly backward. The rotating disk 16 drives the distance sensor 23 to move quickly left and right through the crank 22. The movement enables the ranging sensor 23 to simultaneously collect three-dimensional data of the joint area. Combined with computer algorithms, it can complete the measurement of three core parameters, namely bevel angle, joint spacing and surface flatness, in one go. Compared with traditional equipment that only measures a single parameter, it does not require repeated disassembly and debugging. It can obtain the basic parameters of the joint through edge point recognition and plane fitting, and can realize flatness detection through reference plane deviation calculation. It covers the key indicators of thick plate welding quality control and meets the needs of comprehensive testing. Through the open structure of the clamping frame 1, it can be directly clamped to the edge of the welding plate 24. By rotating the knob 28, the threaded rod 3 can be driven to lift and lower the clamping plate 4. Stable fixation can be completed without professional tools. The overall installation and debugging can be completed within five minutes.The connecting arm 12 and the floating platform 8 are quickly connected via the mating block 801 and connecting bolts 26, reducing installation difficulty and adapting to complex on-site operating environments. The floating platform 8 and spring 11 form an elastic compensation structure; the continuous elastic force of the spring 11 pushes the floating platform 8 to adaptively adjust its position along the sliding rod 10, ensuring that the calibration plate 9 always fits against the edge of the welded plate 24 joint, thus calibrating the measurement reference of the ranging sensor 23 throughout the entire process. Even if there are undulations on the surface of the thick plate, this structure can compensate for positional deviations in real time, ensuring the continuity and accuracy of the sensor's data acquisition and avoiding the local measurement distortion problems caused by the fixed reference of traditional equipment.

[0022] In this invention, in order to further enhance the stability of the U-shaped frame 7, reinforcing ribs are fixedly connected to both the front and rear sides of the upper surface of the U-shaped frame 7. The left side of the reinforcing rib is fixedly connected to the right side of the L-shaped moving platform 6, so that the reinforcing rib plays a stable supporting role for the U-shaped frame 7, thereby further enhancing the stability of the U-shaped frame 7.

[0023] In this invention, in order to further enhance the stability of the floating platform 8, two sets of stabilizing collars are slidably fitted on the outer surface of the sliding rod 10. The inner side of the stabilizing collar is fixedly connected to the outer surface of the floating platform 8, so that the stabilizing collar plays a role in stabilizing the movement trajectory of the floating platform 8, thereby further enhancing the stability of the floating platform 8.

[0024] In this invention, in order to further enhance the stability of the connecting arm 12, a support block 702 is fixedly connected to the right side of the front of the U-shaped frame 7. A support groove 1201 is provided on the outer surface of the connecting arm 12 so that the support block 702 can slide, thereby further enhancing the stability of the connecting arm 12.

[0025] In this invention, in order to further enhance the stability of the rotation of the rotating disk 16, a connecting key is fixedly connected to the top end of the rotating shaft 15, and a keyway adapted to the connecting key is opened on the outer surface of the rotating disk 16. The stability of the rotation of the rotating disk 16 is further enhanced by the cooperation between the connecting key and the keyway.

[0026] In this invention, in order to further enhance the rotational stability of the rotating shaft 15, a shaft bracket 25 is rotatably connected to the outer surface of the rotating shaft 15. The back of the shaft bracket 25 is fixedly connected to the inner wall of the motor bracket 13, so that the shaft bracket 25 plays a supporting role for the rotating shaft 15, thereby further enhancing the rotational stability of the rotating shaft 15.

[0027] In this invention, to further enhance the stability of the connection between the floating platform 8 and the connecting arm 12, a docking block 801 is fixedly connected to the front of the floating platform 8, and a docking groove 1202 adapted to the docking block 801 is opened on the back of the connecting arm 12. Two sets of connecting bolts 26 are inserted between the connecting arm 12 and the docking block 801, and nuts 27 are threaded to the rear end of the connecting bolts 26, so that the connecting arm 12 and the floating platform 8 are connected by the connecting bolts 26 and the nuts 27, thereby further enhancing the stability of the connection between the floating platform 8 and the connecting arm 12. In this invention, in order to further enhance the stability of the clamping frame 1, anti-slip pads are fixedly connected to the top inner wall of the clamping frame 1 and the upper surface of the clamping plate 4. The anti-slip pads are made of rubber and have anti-slip textures on their outer surface, thereby enhancing the friction between the clamping frame 1 and the clamping plate 4 on the welding plate 24 and further enhancing the stability of the clamping frame 1.

[0028] In this invention, in order to further enhance the smoothness of the crank lever 22's movement, ball bearings are provided on the outer surfaces of both the rotating pin 17 and the fixed pin 21. The rotating pin 17 and the fixed pin 21 are rotatably connected to the crank lever 22 through the ball bearings. By providing ball bearings, the smoothness of the crank lever 22's movement is further enhanced.

[0029] A joint measuring device and method for thick plate welding, comprising the following steps: Step 1: Place the clamping frame 1 on the side of one of the welding plates 24 near the weld seam, tighten the knob 28, the knob 28 drives the threaded rod 3 and the clamping plate 4 to rotate, and the clamping plate 4 fixes the clamping frame 1 on the outer surface of the welding plate 24.

[0030] Step 2: Place the calibration plate 9 between the two sets of welding plates 24, and the spring 11 pushes the floating table 8 so that the calibration plate 9 is pressed against the seam side of the welding plate 24. Step 3: Simultaneously start the pneumatic slider 5 and the drive motor 14. The pneumatic slider 5 drives the L-shaped moving platform 6 to move to the right, and the output end of the drive motor 14 drives the rotating shaft 15 to rotate. Step 4: The rotating shaft 15 drives the rotating disk 16 and the rotating pin 17 to rotate. The rotating pin 17 drives the sliding table 20 and the ball block 19 to move linearly left and right through the crank 22. Step 5: Turn on the ranging sensor 23. The ranging sensor 23 moves quickly left and right above the joint of the two sets of welding plates 24. At the same time, the ranging sensor 23 moves slowly backward. The ranging sensor 23 records the protrusion height of the joint of the two sets of welding plates 24 over time. The ranging sensor 23 exports the data and records the spatial coordinates corresponding to the acquisition time, thereby measuring the bevel angle and spacing of each part of the two sets of welding plates 24.

[0031] Further, the calculation steps of the seam parameters of the welding plate 24 are as follows: S1. The ranging sensor 23 collects the distance data between itself and the upper surface of the seam area of the welding plate 24 in real time, and synchronously records the spatial coordinates corresponding to the acquisition moment (x-axis: the left-right movement direction, parallel to the seam width direction; y-axis: the front-back movement direction, parallel to the seam length direction; z-axis: the vertical direction, perpendicular to the surface of the welding plate), forming a three-dimensional data matrix (xᵢ, yⱼ, zᵢⱼ), where i is the serial number of the left-right movement sampling points, j is the serial number of the front-back movement sampling points, and zᵢⱼ is the ranging value corresponding to the i-th x coordinate and the j-th y coordinate; the three-dimensional data matrix is transmitted to the computer, and the computer calculates the target parameters through the following algorithm: S2. Calculation of the seam spacing: The computer performs filtering processing on the zᵢⱼ data under the same yⱼ coordinate (using the Gaussian filtering algorithm to remove measurement noise), identifies two critical points where zᵢⱼ changes abruptly (i.e., the edge points of the welding plates on both sides of the seam), and records the coordinates of the left edge point as (x1ⱼ, yⱼ, z1ⱼ) and the coordinates of the right edge point as (x2ⱼ, yⱼ, z2ⱼ); calculates the seam spacing dⱼ = |x2ⱼ - x1ⱼ| at this yⱼ position according to the distance formula between two points; takes the average value of dⱼ at all yⱼ positions to obtain the average seam spacing, and at the same time records the maximum and minimum values of dⱼ to determine the fluctuation range of the seam spacing; S3. Calculation of the groove angle: For the same yⱼ coordinate, extract several sampling points (x k ⱼ, yⱼ, z k ⱼ) in the edge area of the left welding plate (x < x1ⱼ) and several sampling points (x l ⱼ, yⱼ, z l ⱼ) in the edge area of the right welding plate (x > x2ⱼ), respectively fit the fitting plane equations of the groove surfaces of the left and right welding plates as z = a1x + b1y + c1 and z = a2x + b2y + c2 by the least square method; according to the normal vectors of the two planes n1 = (a1, b1, -1) and n2 = (a2, b2, -1), calculate the groove angle θⱼ at this yⱼ position through the spatial angle formula between two planes θ = arccos[|n1・n2| / (|n1|・|n2|)]; take the average value of θⱼ at all yⱼ positions to obtain the overall groove angle, and at the same time output the distribution curve of θⱼ to reflect the change trend of the groove angle along the seam length direction; S4. Calculation of the flatness: ①Surface flatness of the seam area: Plane fitting is performed on all sampling points (xᵢ, yⱼ, zᵢⱼ) to obtain the reference plane equation z = ax + by + c of the seam area; calculate the deviation value Δzᵢⱼ = |zᵢⱼ - (axᵢ + byⱼ + c)| of each sampling point zᵢⱼ from the reference plane, and take the maximum value of all Δzᵢⱼ as the flatness error of the surface of the seam area; ②Surface flatness of the welding plate: Extract the sampling points of the non-seam area of the left welding plate (x < x1ⱼ - Δx, Δx is the set edge avoidance distance) and the non-seam area of the right welding plate (x > x2ⱼ + Δx) respectively, fit the reference plane for each and calculate the deviation value, and obtain the flatness errors of the surfaces of the two sides of the welding plate respectively; The computer outputs the calculation results of the seam spacing, groove angle, and flatness in the form of a data table and visual graphics (such as spacing distribution curve, groove angle change curve, three-dimensional surface topography map), completing the precise measurement of the 24 seam key parameters of the two groups of welding plates.

[0032] Improvement instructions: Clarify the data acquisition logic: Supplement the spatial coordinate definition of the ranging sensor (the x / y / z axes correspond to the seam width / length / vertical direction respectively), make the data dimension clearer, and provide a coordinate basis for subsequent calculations; Quantify the algorithm details: For the three core parameters (spacing, groove angle, flatness), clarify the algorithms used (such as Gaussian filtering, least squares fitting, plane angle formula, etc.), enhance the enforceability of the claims, and meet the requirements of the patent for "clear and complete"; Refine the calculation steps: Decompose the calculation process of each parameter (such as critical point identification, normal vector solution, deviation calculation), clarify the logical chain of data processing, and avoid ambiguous expressions; Cover key indicators: On the basis of the original "groove angle and spacing", supplement the specific calculations of "flatness" (including the seam area and the welding plate itself), meet the comprehensive inspection requirements of thick plate welding for seam quality, and expand the protection scope and practicality of the claims; Standardize the output form: Clarify the specific content output by the computer (data table + visual graphics), make the presentation method of the measurement results more specific, and meet the actual application scenarios of industrial inspection.

[0033] All electrical components appearing in this article are electrically connected to the external main controller and the 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0034] In summary, this thick plate welding joint measurement device and method, by setting up a pneumatic slider 5, a rotating disk 16, and a distance sensor 23, allows the pneumatic slider 5 to drive the distance sensor 23 to move slowly backward, while the rotating disk 16 drives the distance sensor 23 to move rapidly left and right via a crank 22. This enables the distance sensor 23 to simultaneously collect three-dimensional data of the joint area. Combined with computer algorithms, it can complete the measurement of three core parameters—bevel angle, joint spacing, and surface flatness—in one go. Compared with traditional equipment that only measures a single parameter, it eliminates the need for repeated disassembly and debugging. It can obtain basic joint parameters through edge point recognition and plane fitting, and achieve flatness detection through reference plane deviation calculation, covering key indicators for thick plate welding quality control and meeting comprehensive inspection needs.

[0035] The joint measuring device and method for thick plate welding achieves uniform movement of the distance sensor 23 along the joint length direction through the cooperation of the pneumatic slide rail 2 and the pneumatic slider 5. The drive motor 14 drives the sensor to reciprocate along the width direction through the rotating disk 16 and the crank 22, forming a detection trajectory without blind spots. A 3-meter joint can be completed by a single person in 10 minutes. Compared with the manual measurement that takes 40 minutes by 2-3 people, the efficiency is greatly improved, and the problem of missed detection by humans is avoided.

[0036] Three sets of threaded rods 3, together with clamping plate 4 and anti-slip pad, firmly fix clamping frame 1 to welding plate 24, avoiding reference offset caused by uneven surface of thick plate; spring 11 pushes floating table 8 to drive calibration plate 9 to fit the splice, ensuring accurate initial positioning. With telescopic calibration plate 9 and sliding rod 10 guide structure, it can adapt to thick plates of different thicknesses from 10-100mm, meeting the needs of multiple scenarios such as engineering machinery and shipbuilding.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A joint measuring device for thick plate welding, comprising a clamping frame (1) and a pneumatic slide rail (2) fixed on the upper surface of the clamping frame (1), characterized in that: The clamping frame (1) has three sets of threaded rods (3) threadedly connected to its lower surface. The top of the threaded rod (3) is rotatably connected to a clamping plate (4) and the bottom is fixedly connected to a knob (28). The pneumatic slide rail (2) has a pneumatic slider (5) slidably connected to its outer surface. The upper surface of the pneumatic slider (5) is fixedly connected to an L-shaped moving platform (6). The right side of the L-shaped moving platform (6) is fixedly connected to a U-shaped frame (7). The U-shaped frame (7) has a sliding groove (701) inside. The inner wall of the sliding groove (701) is slidably connected to a floating platform (8). A calibration plate (9) is slidably inserted in the middle of the upper surface of the floating platform (8). Two sets of sliding rods (10) are slidably inserted in the outer surface of the floating platform (8). The two ends of the sliding rods (10) are fixedly connected to the U-shaped frame (7) and the L-shaped moving platform (6) respectively. A spring (11) is fitted on the right side of the outer surface of the sliding rods (10). A connecting arm (12) is fixedly connected to the front of the floating platform (8). A motor bracket (13) is fixedly connected to the right side of the outer surface of the connecting arm (12). A drive motor (14) is fixedly connected to the inner wall of the motor bracket (13). A rotating shaft (15) is fixedly connected to the output end of the drive motor (14). A rotating disk (16) is fixedly connected to the outer surface of the rotating shaft (15). A rotating pin (17) is fixedly connected to the rear side of the outer surface of the rotating disk (16). A fixed guide rail (18) is fixedly connected to the upper surface of the connecting arm (12). A ball block slider (19) is slidably connected to the outer surface of the fixed guide rail (18). A sliding table (20) is fixedly connected to the upper surface of the ball block slider (19). A fixed pin (21) is fixedly connected to the upper surface of the sliding table (20). A crank rod (22) is rotatably connected between the fixed pin (21) and the rotating pin (17). A distance sensor (23) is installed on the outer surface of the sliding table (20). Two sets of welding plates (24) are provided on the inner side of the clamping frame (1).

2. The joint measuring device for thick plate welding according to claim 1, characterized in that: The front and rear sides of the upper surface of the U-shaped frame (7) are fixedly connected with reinforcing ribs, and the left side of the reinforcing ribs is fixedly connected to the right side of the L-shaped moving platform (6).

3. The joint measuring device for thick plate welding according to claim 1, characterized in that: The outer surface of the sliding rod (10) is slidably fitted with two sets of stabilizing collars, and the inner side of the stabilizing collars is fixedly connected to the outer surface of the floating platform (8).

4. The joint measuring device for thick plate welding according to claim 1, characterized in that: The right side of the front of the U-shaped frame (7) is fixedly connected to a support block (702), and the outer surface of the connecting arm (12) is provided with a support groove (1201) for the support block (702) to slide.

5. The joint measuring device for thick plate welding according to claim 1, characterized in that: The top end of the rotating shaft (15) is fixedly connected to a connecting key, and the outer surface of the rotating disk (16) is provided with a keyway that matches the connecting key.

6. The joint measuring device for thick plate welding according to claim 1, characterized in that: The outer surface of the rotating shaft (15) is rotatably connected to a shaft bracket (25), and the back of the shaft bracket (25) is fixedly connected to the inner wall of the motor bracket (13).

7. The joint measuring device for thick plate welding according to claim 1, characterized in that: The floating platform (8) is fixedly connected to the front of the docking block (801), and the back of the connecting arm (12) is provided with a docking groove (1202) that is compatible with the docking block (801). Two sets of connecting bolts (26) are inserted between the connecting arm (12) and the docking block (801), and the rear end of the connecting bolts (26) is threaded with a nut (27).

8. The joint measuring device for thick plate welding according to claim 1, characterized in that: The top inner wall of the clamping frame (1) and the upper surface of the clamping plate (4) are both fixedly connected with anti-slip pads. The anti-slip pads are made of rubber and have anti-slip textures on their outer surface.

9. The joint measuring device for thick plate welding according to claim 1, characterized in that: Both the rotating pin (17) and the fixed pin (21) are provided with ball bearings on their outer surfaces, and the rotating pin (17) and the fixed pin (21) are rotatably connected to the crank rod (22) through the ball bearings.

10. The joint measuring device and method for thick plate welding according to claim 1, used for implementing the joint measuring device for thick plate welding according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Place the clamping frame (1) on the side of one of the welding plates (24) near the weld seam, tighten the knob (28), the knob 28 drives the threaded rod (3) and the clamping plate (4) to rotate, and the clamping plate (4) fixes the clamping frame (1) on the outer surface of the welding plate (24); Step 2: Place the calibration ruler (9) between the two sets of welding plates (24), and the spring (11) pushes the floating table (8) so that the calibration ruler (9) is close to the seam side of the welding plate (24). Step 3: Simultaneously start the pneumatic slider (5) and drive motor (14). The pneumatic slider (5) drives the L-shaped moving platform (6) to move to the right, and the output end of the drive motor (14) drives the rotating shaft (15) to rotate. Step 4: The rotating shaft (15) drives the rotating disk (16) and the rotating pin (17) to rotate. The rotating pin (17) drives the sliding table (20) and the ball block (19) to move linearly left and right through the crank rod (22). Step 5: Turn on the distance sensor (23). The distance sensor (23) moves quickly left and right above the joint of the two sets of welding plates (24). At the same time, the distance sensor (23) moves slowly backward. The distance sensor (23) records the protrusion height at the joint of the two sets of welding plates (24) over time. The distance sensor (23) exports the data and records the spatial coordinates corresponding to the acquisition time, thereby measuring the bevel angle and spacing at each point of the two sets of welding plates (24).

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