Welding seam filming tool and process thereof

Abstract

The present invention discloses a weld filming tool and a process thereof, comprising a trolley (1) that moves above a cylinder weld through a guide mechanism, the trolley (1) being an arc-shaped mechanism, and a through hole for filming is opened at the center of the trolley (1), a film (2) covers the through hole, and the guide mechanism comprises an annular guide rail (5) installed along the inner wall of the cylinder, and a guide hook (4) installed on the trolley (1), and the guide hook (4) is hooked on the annular guide rail (5). The present invention discloses a weld filming tool and a process thereof, which has a simple structure, is easy to use, and can effectively realize 100% flaw detection of the cylinder weld.

Description

Technical Field

[0001] The invention relates to a tool and a filming process for flaw detection and filming of welds (especially closure seams), belonging to the technical field of welding quality detection. Background Art

[0002] At present, in the process of processing and manufacturing the cylinder of equipment such as heat exchangers, it is necessary to perform non-destructive testing on the welds of the welds; conventional flaw detection methods such as the "device for photographing the vertically closed welds on the side of a ship" adopted by Chinese patent CN201720605092.5 cannot be directly applied to the cylinder, especially for cylinders with small apertures or sealed cylinders with only operation holes, and cannot effectively perform 100% flaw detection, thereby failing to guarantee the quality of the products shipped. For this reason, some companies have developed a "small and medium-caliber submerged arc welded pipe weld repair and filming tool" as disclosed in Chinese patent CN201220173697.9, which effectively uses a handle and a positioning plate to insert into the pipe body to film the welds, but its operation method is not flexible and convenient enough, and it also cannot guarantee that all welds of the entire annular structure are filmed 100%. Therefore, there is an urgent need on the market for a tool that can film 100% of the welds. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a weld filming tool and process thereof, which has a simple structure, is easy to use, and can effectively realize 100% flaw detection of the weld in the cylinder.

[0004] The object of the present invention is achieved in that:

[0005] A welding seam filming tool comprises a traveling trolley which travels above the welding seam of a cylinder through a guiding mechanism. The traveling trolley is an arc-shaped mechanism, and a rectangular through hole for filming is opened in the center of the traveling trolley, and a negative film is covered on the through hole.

[0006] The invention discloses a welding seam filming tool, wherein the guide mechanism comprises an annular guide rail installed along the inner wall of a cylinder and a guide hook installed on a traveling trolley, and the guide hook is mounted on the annular guide rail and can ensure the traveling trolley to move smoothly.

[0007] The present invention provides a welding seam filming tool, wherein the guide hooks are provided with two front and rear ones.

[0008] The invention discloses a welding seam filming tool, wherein a guide hook is sleeved with a guide wheel, and the guide wheel slides on an annular guide rail.

[0009] The present invention provides a weld filming tool, wherein installation shafts are arranged at both ends of the traveling trolley, and rolling elements (such as bearings) are arranged at both ends of the installation shaft; or rollers rolling along the radial direction of the cylinder are arranged at the four corners of the traveling trolley.

[0010] The present invention provides a weld filming tool, wherein the bottom plate of the traveling trolley is a curved plate made of metal, through holes for filming are located on the curved plate, and a plurality of magnetic parts are arranged around the film. The magnetic parts adsorb the film on the curved plate, so that the film is located above the weld.

[0011] A weld filming process, the process steps are:

[0012] Preparation steps: First determine the film coverage angle S, that is, the through hole width of the walking trolley corresponds to the central angle of the central axis of the cylinder, and determine the number of rotations N = [360 / S] + 1, so as to ensure that the entire weld can be loaded after the rotation is completed;

[0013] Step 1: The cylinder assembly is placed on the roller, and the flaw detection mechanism is placed under the weld of the cylinder;

[0014] Step 2: After fixing the film on the trolley through the magnetic part, the trolley is placed above the weld in the cylinder through the operation hole, and the guide hook is slidably set on the circular guide rail; then the trolley slides down to the lowest point under the action of gravity, and after the trolley stops, the flaw detection mechanism is started to take pictures;

[0015] Step 3: After filming is completed, reach into the operating hole to take out the trolley, then remove the film on the trolley, and at the same time, the roller rotates to drive the cylinder to rotate by an angle S; then return to step 2 until the cylinder rotates N times to complete the filming of the entire annular weld, thereby completing 100% continuous filming.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention perfectly realizes 100% detection of welds, and has a simple overall structure and convenient operation; thereby effectively reducing the detection cost and the operating difficulty of operators.

[0018] At the same time, according to Section 4.6.4 of GB / T151-2014: "For the circumferential welded joints of the shell-side cylinder of the fixed tube-sheet heat exchanger that cannot be non-destructively tested, argon arc welding should be used for base welding or a pad close to the base metal should be provided along the entire length of the weld root, and the weld joint coefficient φ=0.6", the present invention can meet the weld joint coefficient φ=1.0, and does not need to meet the restriction of "argon arc welding for base welding or a pad close to the base metal along the entire length of the weld root". BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a side sectional view of a weld filming tool in application state.

[0020] Figure 2 A welding seam filming tool of the present invention Figure 1Top view of the .

[0021] Figure 3 A welding seam filming tool of the present invention Figure 1 Radial cross-sectional view.

[0022] in:

[0023] Traveling trolley 1, film 2, magnetic part 3, guide hook 4, annular guide rail 5, guide wheel 6;

[0024] Welding seam 101 and operating hole 102. DETAILED DESCRIPTION

[0025] See also Figures 1 to 3 The present invention relates to a welding seam filming tool, which comprises a walking trolley 1 that moves above the weld of a cylinder through a guide mechanism, wherein the walking trolley 1 is an arc-shaped mechanism, and a through hole for filming is opened in the center of the walking trolley 1, and a film 2 covers the through hole;

[0026] Further, the guide mechanism includes an annular guide rail 5 installed along the inner wall of the cylinder, and a guide hook 4 installed on the walking trolley 1, and the guide hook 4 is hooked on the annular guide rail 5; preferably, the guide hook 4 is provided with two front and rear ones; preferably, the guide hook 4 is provided with a guide wheel 6, and the guide wheel 6 travels on the annular guide rail 5;

[0027] Furthermore, mounting shafts are provided at both ends of the traveling trolley 1, and rolling elements (such as bearings) are provided at both ends of the mounting shafts; or rollers that roll along the radial direction of the cylinder are installed at the four corners of the traveling trolley 1;

[0028] Furthermore, the bottom plate of the walking trolley 1 is a curved plate made of metal, the through hole for filming is located on the curved plate, and a plurality of magnetic members 3 are arranged around the film 2, and the magnetic members 3 adsorb the film 2 on the curved plate, so that the film is located above the weld 101;

[0029] A weld filming process, the process steps are:

[0030] Preparation steps: first determine that the shooting coverage angle of the film 2 is S, that is, the through hole width of the walking trolley 1 corresponds to the central angle of the central axis of the cylinder, and determine the number of rotations N=[360 / S]+1, so as to ensure that the entire weld 101 can be loaded after the rotation is completed; wherein: [360 / S] represents the integer of the quotient of 360 / S;

[0031] Step 1: The cylinder assembly is placed on the roller, and the flaw detection mechanism is placed below the weld 101 of the cylinder;

[0032] Step 2: After fixing the film 2 on the trolley 1 through the magnetic member 3, the trolley 1 is placed above the weld 101 in the cylinder through the operating hole 102, and the guide hook 4 is slidably arranged on the annular guide rail 5; then the trolley 1 slides down to the lowest point under the action of gravity, and after the trolley 1 stops, the flaw detection mechanism is started to take a film;

[0033] Step 3, after the filming is completed, reach into the operating hole 102 to take out the walking trolley 1, then remove the film 2 on the walking trolley 1, and at the same time, the roller rotates to drive the cylinder to rotate by an angle S; then return to step 2 until the cylinder rotates N times to complete the filming of the entire annular weld 101, thereby completing 100% continuous filming.

[0034] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A welding seam filming tool, characterized in that: The invention comprises a trolley (1) which moves on the weld of a cylinder through a guide mechanism, wherein the trolley (1) is an arc-shaped mechanism, and a through hole for filming is opened at the center of the trolley (1), and a negative film (2) covers the through hole; the guide mechanism comprises an annular guide rail (5) installed along the inner wall of the cylinder, and a guide hook (4) installed on the trolley (1), and the guide hook (4) is mounted on the annular guide rail (5); the guide hook (4) is provided with two front and rear ones; the guide hook (4) is provided with a guide wheel (6), The guide wheel (6) slides on the annular guide rail (5); mounting shafts are provided at both ends of the walking trolley (1), and rolling elements are provided at both ends of the mounting shafts; or rollers that roll along the radial direction of the cylinder are installed at the four corners of the walking trolley (1); the bottom plate of the walking trolley (1) is an arc-shaped plate made of metal, the through hole for filming is located on the arc-shaped plate, and a plurality of magnetic elements (3) are provided around the film (2), and the magnetic elements (3) adsorb the film (2) on the arc-shaped plate, so that the film is located above the weld (101).

2. A weld filming process, characterized in that: The process steps are: Preparation steps: first determine that the shooting coverage angle of the film (2) is S, that is, the through hole width of the walking trolley (1) corresponds to the central angle of the central axis of the cylinder, and determine the number of rotations N = [360 / S] + 1, so as to ensure that the entire weld (101) can be loaded after the rotation is completed; Step 1: The cylinder is placed on a roller, and the flaw detection mechanism is placed below the weld (101) of the cylinder; Step 2: After the film (2) is fixed to the trolley (1) through the magnetic member (3), the trolley (1) is placed above the weld (101) in the cylinder through the operating hole (102), and the guide hook (4) is slidably arranged on the annular guide rail (5); then the trolley (1) slides down to the lowest point under the action of gravity, and after the trolley (1) stops, the flaw detection mechanism is started to take a film; Step 3: After the filming is completed, reach into the operating hole (102) to take out the trolley (1), then remove the film (2) on the trolley (1), and at the same time, the roller rotates to drive the cylinder to rotate by an angle S; then return to step 2 until the cylinder rotates N times to complete the filming of the entire annular weld (101), thereby completing 100% continuous filming.

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