Method for Rapid Detection of Flange Turn-up in Hot Melt Butt Joint of PE Pipeline

Abstract

The present invention relates to PE pipeline detection, in particular to a method for quickly detecting the hot-melt butt flanging of PE pipelines. The method comprises the following steps: step A, making a detection ruler; step B, checking the ruler; step C, placing the detection ruler on the PE pipeline, and placing the outer end of the positioning pin in the middle of the weld of the flanging on both sides; step D, longitudinally shifting the vernier blocks of the first vernier ruler and the second vernier ruler so that the first measuring rod and the second measuring rod are close to the side of the flanging from both sides; step E, radially shifting the ruler rods of the first vernier ruler and the second vernier ruler so that the outer ends of the first measuring rod and the second measuring rod are in contact with the pipe wall of the PE pipeline; step F, reading; step G, determining the flanging symmetry detection result. The present invention performs 100% flanging symmetry and joint alignment detection on the joint, and the detection is fast and accurate, the detection efficiency is improved, and the construction quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the detection of PE pipes, in particular to a method for quickly detecting the hot melt butt joint flanging of PE pipes. Background Art

[0002] In engineering construction, the use of PE pipes is increasing. The connection of two sections of PE pipes adopts hot melt welding, and a flange will be generated along the circumference of the PE pipe after welding. The construction specification requires 100% inspection of the symmetry of the flange and the alignment of the joint. The symmetry detection of the flange is that the lowest point of the middle weld cannot be lower than the outer surface of the pipe, and the alignment inspection of the joint is the misalignment amount at any place close to the outer circumference of the flange on both sides of the weld. At present, the conventional method uses a steel ruler or a caliper for inspection, which cannot quickly and accurately judge the quality of the hot melt butt joint connection of PE pipes, and the inspection efficiency is low. The Chinese utility model patent with the authorization announcement number CN211346618U discloses a PE pipe flange detection ruler, which includes a detection ruler body, and a number of detection parts are opened on the detection ruler body. The detection part of this utility model is a notch with a fixed size, which cannot detect the symmetry of the flange and cannot accurately detect the misalignment amount. Summary of the Invention

[0003] The present invention aims to solve the above technical problems, and thus provides a method for quickly detecting the hot melt butt joint flanging of PE pipes, improving the detection efficiency and accuracy.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A method for quickly detecting the hot melt butt joint flanging of PE pipes includes the following steps:

[0006] Step A, manufacturing a detection ruler

[0007] The detection ruler includes a main ruler body, a positioning needle, a first vernier scale, a second vernier scale and a measuring rod. The main ruler body is a double-layer panel structure with a gap in the middle. The main ruler body is symmetrically provided with a hollow first grid hole and a second grid hole. The middle of the main ruler body is provided with an outward-extending positioning needle, and the middle frame of the main ruler body is provided with scales; the first grid hole and the second grid hole are respectively installed with the first vernier scale and the second vernier scale. The two vernier scales are placed in the gap of the double-layer panel and are connected to the main ruler body through a sliding mechanism. The cursor blocks of the first vernier scale and the second vernier scale are respectively installed with a first measuring rod and a second measuring rod;

[0008] Step B, checking the ruler. When the outer ends of the first measuring rod and the second measuring rod are flush with the outer end of the positioning needle, the pointers of the cursor blocks of the two vernier scales point to the zero position of the scale;

[0009] Step C, placing the detection ruler on the PE pipe, and the outer end of the positioning needle is placed in the middle of the welds on both sides of the flange;

[0010] Step D: Vertically move the cursor blocks of the first vernier scale and the second vernier scale to make the first measuring rod and the second measuring rod approach the side surface of the flanging from both sides;

[0011] Step E: Radially move the scale rods of the first vernier scale and the second vernier scale so that the outer ends of the first measuring rod and the second measuring rod fit against the pipe wall of the PE pipe;

[0012] Step F: Take a reading

[0013] Read the scale value pointed to by the pointer from the scale. If the reading is positive, it means that the lowest point of the weld is higher than the outer circumferential surface of the PE pipe; if the reading is negative, it means that the lowest point of the weld is lower than the outer circumferential surface of the PE pipe;

[0014] Step G: Determine the test result of the flanging symmetry

[0015] If the reading is negative, the welding is unqualified. If the reading is positive, determine whether the measured value of symmetry meets the specification requirements; if there is a difference between the two measuring rods, this difference is the offset amount of alignment, and determine whether the offset amount meets the specification requirements.

[0016] Compared with the prior art, the beneficial effects of the present invention adopting the above technical solutions are as follows:

[0017] The flanging symmetry and joint alignment of the joint are 100% detected, and the detection is fast and accurate, improving the detection efficiency and ensuring the construction quality.

[0018] Furthermore, the optimized solution of the present invention is:

[0019] The sliding mechanism includes end plates, an intermediate plate and sliders. End plates are fixedly connected to both ends between the two layers of panels, and the intermediate plate is fixedly connected to the middle between the two layers of panels. Chutes parallel to the width direction of the main scale body are opened at both ends of the inner plate surfaces of the end plates and at both ends of the two plate surfaces of the intermediate plate. Circular sliders matched with the chutes are fixedly connected to the side surfaces at both ends of the two vernier scale rods.

[0020] The cross sections of the first measuring rod and the second measuring rod are rectangular or circular.

[0021] The outer end of the positioning pin is provided with a blade tip structure, and the measuring rod is parallel to the positioning pin. Brief Description of the Drawings

[0022] Figure 1 is the front view of the embodiment of the present invention;

[0023] Figure 2 is Figure 1 the A-A cross-sectional view of

[0024] Figure 3 is Figure 1 the B-B cross-sectional view of

[0025] Figure 4 It is a schematic structural diagram of the main scale body of an embodiment of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the vernier scale of an embodiment of the present invention;

[0027] Figure 6 It is the front view of the measurement state of the present invention;

[0028] Figure 7 It is Figure 6 the top view of;

[0029] Figure 8 It is Figure 6 the left view of.

[0030] In the figure: main scale body 1; first panel 1-1; second panel 1-2; first grid hole 1-3; second grid hole 1-4; middle frame 1-5; scale 1-6; sliding groove 1-7; end plate 1-8; connecting rod 1-9; middle plate 1-10; positioning pin 2; first vernier scale 3; scale rod 3-1; vernier block 3-2; slider 3-3; second vernier scale 4; first measuring rod 5; second measuring rod 6; PE pipe 7; flanging 7-1. Specific embodiments

[0031] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0032] A method for quickly detecting the hot melt butt joint flanging of a PE pipe is carried out according to the following steps:

[0033] Step A, making a detection scale

[0034] The detection scale is mainly composed of a main scale 1, a first vernier scale 3 and a second vernier scale 4 ( Figures 1-5 as shown), the main scale body 1 is rectangular, and it is a double-layer structure, which is mainly composed of a first panel 1-1 and a second panel 1-2. End plates 1-8 are welded between the left and right ends of the first panel 1-1 and the second panel 1-2, and a connecting rod 1-9 is welded between the upper ends of the two panels. A gap is left between the first panel 1-1 and the second panel 1-2;

[0035] The main scale body 1 is symmetrically provided with hollowed-out first grid holes 1-3 and second grid holes 1-4. The middle frame 1-5 is located in the middle of the first grid hole 1-3 and the second grid hole 1-4. The middle frame 1-5 is engraved with a scale 1-6, and the scale 1-6 is arranged along the width direction of the main scale body 1. A positioning pin 2 extending outwards is welded to the long side at the lower end of the main scale body 1. The positioning pin 2 is rectangular, and a blade tip structure is opened at its outer end. The width direction of the positioning pin 2 is consistent with the thickness direction of the main scale body 1, and the positioning pin 2 is located in the middle of the main scale body 1;

[0036] The first grid holes 1-3 and the second grid holes 1-4 are respectively provided with a first vernier 3 and a second vernier 4. The first vernier 3 and the second vernier 4 are symmetrical to the positioning pin 2. The first vernier 3 is composed of a scale bar 3-1, a vernier block 3-2 and a slider 3-3. The scale bar 3-1 is provided with a longitudinal long hole. The vernier block 3-2 is in an I shape. The vertical part of the vernier block 3-2 is placed in the long hole and slides longitudinally along the long hole. One end of the long hole is open. After installing the vernier block 3-2, a limit block is welded. The moving directions of the vernier blocks 3-2 of the two verniers are parallel to the length direction of the main scale body 1. The first vernier 3 and the second vernier 4 are respectively slidably connected to the main scale body 1 through sliding mechanisms. The sliding mechanisms include end plates 1-8, intermediate plates 1-10 and sliders 3-3. At both ends of the inner plate surface of the end plate 1-8 and at both ends of the two plate surfaces of the intermediate plate 1-10, sliding grooves 1-7 are respectively opened. The sliding grooves 1-7 are parallel to the width direction of the main scale body. Sliders 3-3 are respectively welded to the side surfaces of both ends of the scale bars 3-1 of the two verniers. The sliders 3-3 cooperate with the sliding grooves 1-7. The scale bars 3-1 of the first vernier 3 and the second vernier 4 slide on the main scale body 1 along its width direction. A stop block is welded to the lower end of each sliding groove 1-7;

[0037] A first measuring rod 5 is installed on the vernier block 3-2 of the first vernier 3, and a second measuring rod 6 is installed on the vernier block 3-2 of the second vernier 4. The outer ends of the first measuring rod 5 and the second measuring rod 6 extend out of the main scale body 1 along the direction of the positioning pin 2. The first measuring rod 5 and the second measuring rod 6 are parallel to the positioning pin 2. The cross sections of the first measuring rod 5 and the second measuring rod 6 are rectangular or circular. Pointers are respectively installed on the vernier blocks 3-2 of the first vernier 3 and the second vernier 4. The pointers point to the scale 1-6;

[0038] Step B: Check the ruler. When the outer ends of the first measuring rod 5 and the second measuring rod 6 are flush with the outer end of the positioning pin 2, the pointers of the vernier blocks 3-2 of the two verniers point to the zero position of the scale 1-6;

[0039] Step C: Place the inspection ruler on the PE pipe 7. The cutting edge structure at the outer end of the positioning pin 2 is placed in the middle of the welds of the two side flanges 7-1;

[0040] Step D: Longitudinally move the vernier blocks 3-2 of the first vernier 3 and the second vernier 4, so that the first measuring rod 5 and the second measuring rod 6 approach the side surfaces of the flange 7-1 from both sides;

[0041] Step E: Radially move the scale bars 3-1 of the first vernier 3 and the second vernier 4, so that the lower ends of the first measuring rod 5 and the second measuring rod 6 are in contact with the pipe wall of the PE pipe 7;

[0042] Step F: Read the value

[0043] Read the scale value pointed by the pointer from scale 1 - 6. A positive reading indicates that the lowest point of the weld is higher than the outer circumferential surface of the PE pipe 7, and a negative reading indicates that the lowest point of the weld is lower than the outer circumferential surface of the PE pipe 7;

[0044] Step G, determine the result of the flanging symmetry detection

[0045] If the reading is negative, the welding is unqualified; if the reading is positive, determine whether the measured value of symmetry meets the specification requirements; if there is a difference between the two measuring rods, this difference is the offset amount of alignment, and determine whether the offset amount meets the specification requirements.

[0046] The present invention quickly and accurately performs 100% flanging symmetry and joint alignment inspection on the joints, improving the construction quality control.

[0047] The above are only the preferred and feasible embodiments of the present invention, and do not limit the scope of the rights of the present invention. Any equivalent structural changes made by using the content of the specification and drawings of the present invention are included in the scope of the rights of the present invention.

Claims

1. A method for quickly detecting the hot-melt butt flanging of a PE pipe, comprising the following steps: Step A: Make a testing ruler The detection ruler comprises a main ruler body, a positioning needle, a first vernier ruler, a second vernier ruler and a measuring rod. The main ruler body is a double-layer panel structure with a gap in the middle. The main ruler body is symmetrically provided with a first grid hole and a second grid hole. An outwardly extending positioning needle is provided in the middle of the main ruler body. The middle frame of the main ruler body is provided with a scale. The first grid hole and the second grid hole are respectively provided with a first vernier ruler and a second vernier ruler. The two vernier rulers are placed in the gap of the double-layer panel and connected to the main ruler body through a sliding mechanism. The vernier blocks of the first vernier ruler and the second vernier ruler are respectively provided with a first measuring rod and a second measuring rod. Step B: Check the ruler. When the outer ends of the first measuring rod and the second measuring rod are flush with the outer end of the positioning pin, the pointers of the vernier blocks of the two vernier rulers point to the zero position of the scale. Step C: Place the measuring ruler on the PE pipe, and place the outer end of the positioning needle in the middle of the welds of the flanges on both sides; Step D, longitudinally move the vernier blocks of the first vernier ruler and the second vernier ruler to make the first measuring rod and the second measuring rod close to the side surface of the flange from both sides; Step E, radially moving the ruler rods of the first vernier ruler and the second vernier ruler, so that the outer ends of the first measuring rod and the second measuring rod are in contact with the pipe wall of the PE pipe; Step F: Reading Read the scale value pointed by the pointer from the scale. If the reading is a positive value, it means that the lowest point of the weld is higher than the outer circumference of the PE pipe. If the reading is a negative value, it means that the lowest point of the weld is lower than the outer circumference of the PE pipe. Step G: Determine the flanging symmetry test results If the reading is negative, the welding is unqualified; if the reading is positive, determine whether the symmetry measurement value meets the specification requirements; if there is a difference between the two measuring rods, the difference is the misalignment amount of the alignment, determine whether the misalignment amount meets the specification requirements.

2. The method for quickly detecting the flanging of hot-melt butt joint of PE pipeline according to claim 1, wherein: The sliding mechanism includes an end plate, an intermediate plate, and a sliding block. The two ends between the two layers of panels are fixedly connected to the end plates, and the middle between the two layers of panels is fixedly connected to the intermediate plate. The two ends of the inner plate surface of the end plate and the two ends of the two plate surfaces of the intermediate plate are provided with sliding grooves parallel to the width direction of the main scale body. The side surfaces at the two ends of the two vernier scale rods are fixedly connected to circular sliding blocks that cooperate with the sliding grooves.

3. The method for quickly detecting the bead of hot-melt butt joint of PE pipeline according to claim 1, wherein: The cross-sections of the first measuring rod and the second measuring rod are rectangular or circular.

4. The method for quickly detecting the bead of hot melt butt joint of PE pipe according to claim 1, characterized in that: The outer end of the positioning needle is provided with a blade tip structure, and the measuring rod is parallel to the positioning needle.

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