A tube sheet corner joint weld inspection line scribe device and method

Abstract

The present application provides a pipe plate corner joint weld detection line marking device and method in the field of welding. The device comprises a fixing device, a detection line marker installed on one side of the fixing device, an electric motor shaft installed on the other side of the fixing device, an electric motor rotor connected with the electric motor shaft and provided with an electric motor switch, a lifting device provided with a pressing rod and fixed on the electric motor rotor, a support fixed on a base, a universal pulley installed on the base, and a support structure composed of the support and the base. The lifting device and the support structure together form a lifting device. The method comprises the following steps: 1) installing and correcting the plate specimen; 2) adjusting the position of the retractable marking needle on the marker; 3) marking the weld bevel edge melting amount detection line on the plate specimen; and 4) after marking the weld bevel edge melting amount detection line, assembling and welding the plate specimen and the pipe. The device and method are suitable for application.

Description

Technical Field

[0001] This invention relates to the field of welding, specifically to a device and method for marking inspection lines on the bevel edge of a tube sheet corner joint to measure weld width, and particularly to a tube sheet corner joint weld inspection line marking device and method. Background Technology

[0002] Numerous fillet joint welds exist in tube-to-plate welding. After welding, the fusion amount at the bevel edges of the plate cannot be accurately measured due to the influence of the pipe fittings, meaning the weld width cannot be measured. In metal structure welding, excessively wide welds result in severe heat exposure at the joint, leading to coarse weld grains, reduced plasticity and toughness, and a larger heat-affected zone, which easily generates welding stress and deformation, while also wasting materials and increasing costs. Conversely, excessively narrow welds may result in poor fusion between the base metal and the weld, causing stress concentration and making the weld prone to welding defects such as undercut, cracks, and lack of fusion, affecting joint strength. These problems adversely affect weld surface finish and the strength of the welded structure, posing risks to construction quality.

[0003] Currently, during the construction of this type of weld, especially during welder certification exams, it is necessary to mark inspection lines on the edge of the plate bevel for detecting the weld edge fusion amount. Specific methods for marking these lines are as follows: 1. Professional personnel use reference objects to measure and mark the inspection lines, a cumbersome process that wastes personnel and time and is prone to human error; 2. During plate bevel processing, the inspection lines are marked using machining. While this method is fast and accurate, the distance between the inspection lines and the edge of the plate bevel can change to varying degrees during the assembly and grinding of the plate specimen, severely affecting the accuracy of the weld width measurement.

[0004] There is an urgent need for a weld seam inspection line marking device and method. Summary of the Invention

[0005] To address the shortcomings of existing technologies and the inability to accurately measure the fusion amount at the bevel edge of tube sheet corner joint welds after welding, this invention provides a device and method for marking inspection lines on tube sheet corner joint welds. This method involves welders marking inspection lines on the bevel edge of a plate-shaped specimen after grinding and before assembly. After welding, measurements are taken using these inspection lines to detect the fusion amount at the bevel edge of the cap weld, accurately measuring the weld width. This effectively controls the quality of the weld cap, improves the strength of the welded structure, saves labor costs, increases work efficiency, and solves the technical problem of measuring weld fusion width by marking inspection lines at the bevel edge of tube sheet corner joints.

[0006] The solution adopted by this invention to solve the technical problem is: A device for marking inspection lines at corner joint welds of tube sheets includes a fixing device with an inspection line marker installed on one side; the other side of the fixing device is mounted on a motor shaft, which is connected to a motor rotor with a motor switch; the motor stator is fixed on a lifting device with a pressure rod; the lifting device is mounted on a bracket, which is fixedly mounted on a base; universal pulleys are installed on the base; the bracket and the base form a support structure, and the lifting device and the support structure together form a lifting device.

[0007] To further address the technical problem this invention aims to solve, the present invention provides a method for marking inspection lines on weld seams of tube sheet corner joints, comprising the following steps: Step 1: Install and straighten the sheet metal specimen; After the specimen is polished, place the specimen with the bevel facing up on the universal pulley on the base surface. Press down the pressure bar with your right hand to extend the lifting device with the test line scribing device downwards until the outer surface of the hemispherical pressure plate on the test line scribing device contacts the bevel surface of the plate specimen. The plate specimen slides on the universal pulley until the center of the plate specimen is coaxial with the test line scribing device. Step 2: Adjust the position of the retractable scribing needle on the scribing tool; After the plate specimen is fixed, the position of the adjustable scriber holder with the retractable scriber is adjusted so that the tip of the retractable scriber contacts the surface of the plate specimen, and the specified distance between the tip of the retractable scriber and the bevel edge of the plate specimen is ensured. Then the fixing bolts are tightened. Step 3: Draw a weld bevel edge melting measurement line on the plate specimen; After completing steps one and two, turn on the motor switch with your left hand. At this time, the motor rotor, along with the motor shaft, fixing device, and scribing device, will rotate synchronously. However, the shaft inside the bearing of the scribing device, along with the hemispherical pressure plate, will remain stationary on the plate specimen. After rotating once, the retractable scribing needle will scribble a circle of weld bevel edge melting detection line on the surface of the plate specimen. At this time, release the pressure bar with your right hand. The motor rotor, along with the motor shaft, fixing device, and scribing device, will return to its original position. Turn off the motor switch with your left hand, and the scribing will be completed. Step 4: After marking the weld bevel edge melting measurement line, assemble and weld the plate specimen and pipe fitting; after welding, measure using the reference measurement line.

[0008] Positive effects: 1. The device proposed in this invention has a simple structure and flexible operation. It utilizes a lifting device to drive the scribing tool vertically downwards, causing the outer surface of the hemispherical pressure plate on the scribing tool to contact the bevel surface of the plate specimen. Due to the pressure, the plate specimen slides on the universal pulleys, quickly correcting and fixing its position. Simultaneously, the motor rotor drives the motor shaft, fixing device, and scribing tool to rotate synchronously, causing the retractable scribing needle to draw a detection line for the weld bevel edge melting amount on the surface of the plate specimen. Adjusting the size and position of the adjustable scribing needle using the scribing ruler on the scribing tool improves the accuracy of the scribing calibration, making the distance between the detection line and the edge of the plate bevel more accurate after assembly and grinding of the plate specimen. This improves the accuracy of weld width detection. Furthermore, welders can operate independently; the scribing uses a motor rotor, which is fast and eliminates the waste of personnel and time associated with dedicated scribing, thus improving production efficiency.

[0009] 2. The method proposed in this invention involves, after the bevel of the plate-shaped specimen is ground, using the outer surface of the lower part of the hemispherical pressure plate on the detection line scribing device to contact the bevel surface of the plate specimen. Under pressure, the plate specimen slides on the universal pulley, quickly and accurately correcting and fixing the position of the plate specimen, ensuring that the center point of the hemispherical pressure plate and the plate specimen overlaps. The adjustable scribing needle, with the center point of the hemispherical pressure plate and the plate specimen as the axis, uses the rotor of the motor to rotate, so that the retractable scribing needle accurately scribes a circle of weld bevel edge melting amount detection line on the surface of the plate specimen. This solves the problem that the distance between the detection line and the edge of the plate bevel changes to varying degrees during the assembly and grinding of the plate-shaped specimen, which seriously affects the detection accuracy of the weld width value.

[0010] It is suitable for use as a scribing device and method for inspecting weld seams at tube sheet corner joints. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the technical solutions in 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. The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0012] Figure 1 This is a schematic diagram of the structure in this embodiment; Figure 2 This is a diagram showing the working state of this embodiment; Figure 3 This is a schematic diagram of the structure of the line marking device. Figure 4 This is a schematic diagram of the lifting device.

[0013] In the diagram, 1. Lifting device, 1.1. Gear, 1.2. Rack, 1.3. Fixing bolt, 1.4 Spring, 2. Pressure rod, 3. Motor rotor, 4. Motor switch, 5. Motor shaft, 6. Fixing device, 7. Detection line scribing device, 7.1. Connecting rod, 7.2. Bushing, 7.3. Shaft, 7.4. Bearing, 7.5. Hemispherical pressure plate, 7.6 Scribing ruler, 7.7. Telescopic scriber, 7.8. Adjustable scriber holder, 7.9. Fixing bolt, 8. Universal pulley, 9. Base, 10. Bracket, 11. Power cord, 12. Plate specimen. Detailed Implementation

[0014] 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. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0016] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0019] In the description of the embodiments in this application, the term "multiple" refers to two or more (including two). Similarly, "Multiple sets" refers to two or more sets (including two sets), and "multiple tablets" refers to two or more tablets (including two tablets).

[0020] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0021] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "installation" will be used. Terms such as “connected,” “linked,” and “fixed” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0022] As shown in the figure, a tube sheet corner joint weld inspection line marking device includes a fixing device 6, on one side of which an inspection line marking device 7 is installed; the other side of the fixing device 6 is installed on a motor shaft 5, which is connected to a motor rotor 3 with a motor switch; the motor stator is fixed on a lifting device 1 with a pressure rod 2; the lifting device 1 is installed on a bracket 10, which is fixedly installed on a base 9; a universal pulley 8 is installed on the base 9; the bracket 10 and the base 9 form a support structure, and the lifting device 1 and the support structure together form a lifting structure.

[0023] To ensure the stability of the structure of the present invention, the detection line scribing device 7 includes a connecting rod 7.1, a bushing 7.2, a shaft 7.3, a bearing 7.4, a hemispherical pressure plate 7.5, a scribing ruler 7.6, a retractable scribing needle 7.7, an adjustable scribing needle retainer 7.8, and a fixing bolt 7.9; The connecting rod 7.1 is connected to the fixing device 6 and the bushing 7.2 respectively; the bearing 7.4 with the shaft 7.3 is installed inside the bushing 7.2; a hemispherical pressure plate 7.5 is fixedly installed at one end of the shaft 7.3; a scribing ruler 7.6 is installed on the outside of the bushing 7.2; an adjustable scribing needle retainer 7.8 is installed on the scribing ruler 7.6; the retractable scribing needle 7.7 is fixed to the adjustable scribing needle retainer 7.8 by a fixing bolt 7.9.

[0024] During the scribing operation, the shaft 7.3, which is fixedly installed with a hemispherical pressure plate 7.5 inside the bearing 7.4, remains stationary. The bushing 7.2 outside the bearing 7.4 and other components of the inspection line scribing device 7 rotate simultaneously to scribing the weld inspection line.

[0025] To optimize the structure of the present invention, the lower part of the hemispherical pressure plate 7.5 is hemispherical. During operation, the lower outer surface of the hemispherical pressure plate 7.5 contacts and presses against the bevel surface of the plate specimen, thus ensuring that the plate specimen and the hemispherical pressure plate are aligned and coaxial.

[0026] To further optimize the structure of the present invention, a pressure rod 2 is installed on the lifting device 1. The pressure rod 2 is connected to a gear 1.1 inside the lifting device 1. The gear 1.1 meshes with a rack 1.2. A spring 1.4 is provided between the rack 1.2 and the upper part of the lifting device 1. A fixing bolt 1.3 is installed on the outside of the rack 1.2. The rack 1.2 is connected to the stator of the motor through the fixing bolt 1.3.

[0027] During operation, when the pressure rod 2 is pressed down, the gear 1.1 rotates, causing the rack 1.2, which is equipped with the motor stator, to slide downwards. When the pressure rod 2 is released, the lifting device 1 and the motor stator return to their original positions simultaneously under the action of the spring 1.4.

[0028] In use, the above structure first uses the lifting device 1 to press down, driving the motor stator and the detection line scribing device 7 to move downwards until the hemispherical pressure plate 7.5 on the detection line scribing device 7 contacts and presses against the bevel surface of the specimen 12 placed on the universal pulley 8 on the surface of the base 9, which achieves the effect of quickly fixing the specimen 12 and ensuring that the center of the specimen 12 is coaxial with the detection line scribing device 7. Then, the motor stator drives the detection line scribing device 7 to rotate, leaving scribing lines on the base material, which achieves the scribing positioning effect.

[0029] Method for using this device to mark the melting amount detection line of the weld bevel edge on the tube sheet corner joint cap surface: Step 1: Install and straighten the sheet metal specimen; After the bevel of the plate specimen 12 is ground, it is placed with the bevel facing upward on the universal pulley 8 on the upper surface of the base 9. The right hand holds the handle of the pressure rod 2 and presses the pressure rod 2 down. The gear 1.1 connected to the pressure rod 2 in the lifting device 1 drives the rack 1.2 to slide down, so that the detection line scribing device 7 installed on the rack 1.2 in the lifting device 1 extends downward, so that the lower surface of the upper hemispherical pressure plate 7.5 of the detection line scribing device 7 contacts and presses against the bevel surface of the specimen 12, so that the plate specimen 12 moves on the universal pulley 8 until the center of the plate specimen 12 is coaxial with the detection line scribing device 7, ensuring that the plate specimen 12 and the hemispherical pressure plate 7.5 are aligned, thereby correcting the scribing position angle of the specimen 12. Step 2: Adjust the position of the retractable scribing needle 7.7 on the scribing device 7; After the plate specimen 12 is fixed, the position of the adjustable scriber holder 7.8, which is equipped with a retractable scriber 7.7, is adjusted according to the position of the bevel edge on the scriber ruler 7.6, so that the tip of the retractable scriber 7.7 contacts the surface of the plate specimen 12 and ensures that the tip of the retractable scriber 7.7 is at the specified distance from the bevel edge of the plate specimen 12. Then, the fixing bolts 7.9 are tightened to ensure that the position of the retractable scriber is stable during the scribe process and that the scriber weld inspection line is accurate and unchanged. Step 3: Draw a weld bevel edge melting measurement line on plate specimen 12; After completing steps one and two, press down on the pressure lever 2 with your right hand and start the motor switch 4 with your left hand. The motor rotor 3, along with the motor shaft 5, the fixing device 6, and the detection line scribing device 7, rotate synchronously. At this time, the shaft 7.3 inside the bearing 7.4 on the detection line scribing device 7, together with the hemispherical pressure plate 7.5, presses against the plate specimen 12 and remains stationary. After the telescopic scribing needle 7.7 rotates once, it scribes a circle of weld bevel edge melting amount detection line on the surface of the plate specimen 12. At this time, release the pressure lever 2 with your right hand. Under the pull of the spring 1.4 inside the lifting device 1, the lifting device 1, along with the motor rotor 3, the motor shaft 5, the fixing device 6, and the detection line scribing device 7, returns to its original position. Turn off the motor switch 4 with your left hand, and the scribing is finished. Step 4: After marking the weld bevel edge melting amount detection line, assemble and weld the plate specimen 12 and the pipe fitting; after welding, measure by referring to the detection line to detect the melting amount of the plate bevel edge of the cover weld, accurately detect the weld width, thereby effectively controlling the weld cover quality, improving the strength of the welded structure, saving personnel construction costs, and improving work production efficiency.

[0030] Features of this embodiment: This device utilizes the principle that the spherical surface of the hemispherical pressure plate 7.5 on the upper part of the detection line scribing device 7 forms a concentric shape after contacting the circular bevel surface. This ensures that the detection line scribing device 7, with the hemispherical pressure plate 7.5 as the center, scribing the weld bevel edge melting amount detection line on the surface of the plate specimen 12 is accurate and error-free. This solves the problem that the distance between the detection line and the edge of the plate bevel changes to varying degrees during the assembly and grinding of the plate specimen, which seriously affects the accuracy of the weld width detection.

[0031] Finally, it should be noted that: The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for marking inspection lines at tube sheet corner joint welds, characterized in that: The device includes a fixing device (6), on one side of which a detection line scribing device (7) is installed; on the other side of which the fixing device (6) is installed on a motor shaft (5), which is connected to a motor rotor (3) with a motor switch (4); the motor stator is fixed on a lifting device (1) with a pressure rod (2); the lifting device (1) is installed on a bracket (10), which is fixedly installed on a base (9); a universal pulley (8) is installed on the base (9); the bracket (10) and the base (9) form a support structure, and the lifting device (1) and the support structure together form a lifting structure; The detection line scribing device (7) includes a connecting rod (7.1), a bushing (7.2), a shaft (7.3), a bearing (7.4), a hemispherical pressure plate (7.5), a scribing ruler (7.6), a retractable scribing needle (7.7), an adjustable scribing needle retainer (7.8), and a fixing bolt (7.9). The connecting rod (7.1) is connected to the fixing device (6) and the bushing (7.2) respectively; a bearing (7.4) with a shaft (7.3) is installed inside the bushing (7.2); a hemispherical pressure plate (7.5) is fixedly installed at one end of the shaft (7.3); a scribing ruler (7.6) is installed on the outside of the bushing (7.2); an adjustable scribing needle holder (7.8) is installed on the scribing ruler (7.6); the retractable scribing needle (7.7) is fixed on the adjustable scribing needle holder (7.8) by a fixing bolt (7.9); The lower part of the hemispherical pressure plate (7.5) is hemispherical. During operation, the lower outer surface of the hemispherical pressure plate (7.5) contacts and presses against the bevel surface of the plate specimen. At this time, it is ensured that the plate specimen and the hemispherical pressure plate are aligned and coaxial. A pressure rod (2) is installed on the lifting device (1). The pressure rod (2) is connected to a gear (1.1) inside the lifting device (1). The gear (1.1) meshes with a rack (1.2). A spring (1.4) is provided between the rack (1.2) and the upper part of the lifting device (1). A fixing bolt (1.3) is installed on the outside of the rack (1.2). The rack (1.2) is connected to the stator of the motor through the fixing bolt (1.3).

2. The tube sheet corner joint weld inspection line marking device according to claim 1, characterized in that: When the inspection line scribing device (7) scribing operation is performed, the shaft (7.3) with the hemispherical pressure plate (7.5) fixedly installed inside the bearing (7.4) remains stationary, while the bushing (7.2) outside the bearing (7.4) and other components of the inspection line scribing device (7) rotate simultaneously to scribing the weld inspection line.

3. The tube sheet corner joint weld inspection line marking device according to claim 1, characterized in that: When the lifting device (1) is in operation, when the pressure rod (2) is pressed down, the gear (1.1) rotates and drives the rack (1.2) with the motor stator installed to slide down. When the pressure rod (2) is released, the lifting device (1) and the motor stator return to their original positions simultaneously under the action of the spring (1.4).

4. A method for marking inspection lines for fillet welds in tube sheet joints, characterized in that: The tube sheet corner joint weld inspection line marking device according to any one of claims 1-3 includes the following steps: Step 1: Install and straighten the plate specimen (12); After the bevel of the plate specimen (12) is finished, place it with the bevel facing upward on the universal pulley (8) on the upper surface of the base (9). Hold the handle of the pressure rod (2) with your right hand and press the pressure rod (2) down. The gear (1.1) connected to the pressure rod (2) in the lifting device (1) drives the rack (1.2) to slide down, so that the detection line scribing device (7) installed on the rack (1.2) in the lifting device (1) extends downward, so that the lower surface of the upper hemispherical pressure plate (7.5) of the detection line scribing device (7) contacts and presses against the bevel surface of the plate specimen (12), so that the plate specimen (12) moves on the universal pulley (8) until the center of the plate specimen (12) is coaxial with the detection line scribing device (7). Step 2: Adjust the position of the retractable scribing needle (7.7) on the scribing device (7); After the plate specimen (12) is fixed, adjust the position of the adjustable scriber holder (7.8) with the retractable scriber (7.7) on the scriber (7.6) according to the position of the bevel edge, so that the tip of the retractable scriber (7.7) contacts the surface of the plate specimen (12) and ensures that the tip of the retractable scriber (7.7) is at a specified distance from the bevel edge of the plate specimen (12). Then tighten the fixing bolt (7.9). Step 3: Draw a weld bevel edge melting measurement line on the plate specimen (12); After completing steps one and two, press down on the pressure bar (2) with your right hand and start the motor switch (4) with your left hand. The motor rotor (3) rotates synchronously with the motor shaft (5), the fixing device (6) and the detection line scribing device (7). At this time, the shaft (7.3) in the bearing (7.4) of the detection line scribing device (7) along with the hemispherical pressure plate (7.5) presses on the plate specimen (12) and remains stationary. After the telescopic scribing needle (7.7) rotates once, the telescopic scribing needle (7.7) scribes a circle of weld bevel edge melting detection line on the surface of the plate specimen (12). At this time, release the pressure bar (2) with your right hand. Under the pull of the spring (1.4) in the lifting device (1), the lifting device (1) returns to its original position with the motor rotor (3), the motor shaft (5), the fixing device (6) and the detection line scribing device (7). Turn off the motor switch (4) with your left hand, and the scribing ends. Step 4: After marking the weld bevel edge melting detection line, assemble and weld the plate specimen (12) and pipe fitting; after welding, measure through the reference detection line.

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