An in-service ultrasonic flaw detection device for the inner wall of the insertable pipe socket fillet weld

Abstract

The present invention discloses an in-service ultrasonic flaw detection device for the inner wall of the corner weld of an inserted pipe seat, comprising a pipe mouth bracket, a guide rail with a scale, a positioning device, a sensor and a digital display screen; wherein, two guide rails with a scale are provided, symmetrically arranged along the two sides of the placement position of the detection probe, the two ends of the guide rail with a scale are embedded in the variable diameter guide rail of the pipe mouth bracket and can slide along the circumferential direction, the positioning device is located in the guide rail with a scale, and can move axially with the detection probe, the sensor is built into the inner wall of the guide rail with a scale, and is located at the center line position of the positioning device, and the digital display screen is fixed at the connection between the pipe mouth bracket and the guide rail with a scale. The present invention will adjust the diameter of the variable diameter guide rail of the pipe mouth bracket to the inner diameter of the pipe mouth according to the diameter of the pipe to be detected, adjust the variable diameter ring to be slightly larger than the pipe diameter, and then place the variable diameter guide rail inside the pipe mouth, and the variable diameter ring is placed at the pipe mouth of the pipe mouth, which is used to fix the pipe mouth bracket at the pipe mouth and prevent it from falling into the pipe mouth.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic flaw detection, and in particular relates to an in-service ultrasonic flaw detection device for inspecting the inner wall of an insert-type pipe seat fillet weld for butting a pressure vessel body with a pipe (100mm≤OD≤159mm). Background Art

[0002] Ultrasonic flaw detection is a method of inspecting defects in parts by using the characteristic that ultrasound can penetrate into the interior of metal materials and produce reflection at the edge of the section when entering from one section to another. When the ultrasonic beam passes from the surface of the part through the probe to the inside of the metal, it generates reflected waves when encountering defects and the bottom of the part, forming pulse waveforms on the fluorescent screen. The location and size of the defects are judged based on these pulse waveforms. When inspecting the inserted pipe seat corner welds connecting the pressure vessel body and the pipe (100mm≤OD≤159mm), the inspectors need to hold the ultrasonic probe on the outer wall of the pipe seat and enter the pressure vessel to contact the weld to be tested. When inspecting the outer wall, the inspectors cannot fully inspect the entire weld due to the weld structure. When inspecting the pipe weld inside the pressure vessel, due to the small inner diameter of the pipe, the light is dim, and there is a lack of space and conditions required for inspection. Therefore, when encountering reflected waves during manual scanning, it is often impossible to measure or accurately measure the position of the probe and the position of the defect reflection point, and the probe is easy to slip when encountering vertical pipes. Multiple inspections are usually required, resulting in low inspection efficiency and inaccurate inspection results, making it difficult to ensure the quality of the inspected welds. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned shortcomings in the prior art, and provides an in-service ultrasonic flaw detection device for the inner wall of the corner weld of an inserted pipe seat for butt jointing a pressure vessel body with a pipe (100mm≤OD≤159mm). The ultrasonic probe is fixed on a positioning device with a scale guide rail, and then the pipe mouth bracket is adjusted to the size of the inner diameter of the pipe and placed in the pipe mouth. The probe is moved to drive the roller of the fixing device to slide and contact the sensor, so that the probe movement distance is displayed on the digital display screen on the pipe mouth bracket. The probe is not affected by the installation position of the pipe, the small operating space in the pipe, the insufficient ambient light, the inability to measure the probe position and read the measurement data, etc., and can solve the problem of limited in-service ultrasonic flaw detection conditions for the inner wall of the corner weld of the inserted pipe seat for butt jointing a pressure vessel body with a pipe (100mm≤OD≤159mm).

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] An in-service ultrasonic flaw detection device for the inner wall of an inserted pipe socket fillet weld includes a pipe mouth bracket, a guide rail with a scale, a positioning device, a sensor and a digital display screen; wherein, two guide rails with a scale are provided, which are symmetrically arranged on both sides of the placement position of the detection probe, and the two ends of the guide rails with a scale are embedded in the variable diameter guide rail of the pipe mouth bracket and can slide in the circumferential direction, the positioning device is located in the guide rail with a scale, and can move axially with the detection probe, the sensor is built into the inner wall of the guide rail with a scale, and is located at the center line position of the positioning device, and the digital display screen is fixed at the connection between the pipe mouth bracket and the guide rail with a scale.

[0006] A further improvement of the present invention is that the pipe mouth bracket includes 4 pull rods, 1 variable diameter ring, 2 variable diameter guide rails of equal diameter and 4 steel balls. The pull rods are respectively located between the variable diameter ring and the variable diameter guide rail and between the two variable diameter guide rails. The pull rods are connected to the variable diameter ring and the variable diameter guide rail through a sleeve ring. The steel balls are respectively embedded in the inner sides of the two variable diameter guide rails of equal diameter, with 2 balls on each side.

[0007] A further improvement of the present invention is that the guide rail with a ruler comprises a guide rail, a ruler and a fixed chain, the guide rail is fixed between two variable diameter guide rails of equal diameter, and both ends are connected to the variable diameter guide rails through steel balls embedded in the variable diameter guide rails. The ruler is set on the surface of the guide rail for observing and measuring the position of the probe, and the fixed chain is set near the end of the variable diameter guide rail and is used to connect the two guide rails on the same side.

[0008] A further improvement of the present invention is that the positioning device is located inside the guide rail with scale, includes a roller and a probe fixing shaft, and is symmetrically arranged in the two guide rails with scale, and drives the roller to rotate by detecting the movement of the probe, triggering the sensor to generate a movement signal.

[0009] A further improvement of the present invention is that the sensor is located on the center line of the roller of the positioning device, and is connected to the digital display screen at the connection between the pipe mouth bracket and the guide rail with a scale, so as to identify the rotation direction of the roller in the positioning device and the forward or backward distance of the detection probe to generate a signal.

[0010] A further improvement of the present invention is that the digital display screen can slide circumferentially along the variable diameter guide rail of the pipe mouth bracket along with the guide rail with scale, and is used to identify the movement signal sent by the sensor and convert the signal into a digital display on the digital display screen.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] 1. The present invention adjusts the diameter of the variable diameter guide rail of the pipe mouth bracket to the inner diameter of the pipe mouth according to the diameter of the pipe to be tested, adjusts the variable diameter ring to be slightly larger than the pipe diameter, and then places the variable diameter guide rail inside the pipe mouth, and the variable diameter ring is placed at the pipe mouth of the pipe mouth, so as to fix the pipe mouth bracket at the pipe mouth and prevent it from falling into the pipe mouth.

[0013] 2. The positioning device and the fixing chain with the end of the scale rail in the present invention are used to fix the detection probe, keep the detection probe and the positioning device roller moving forward and backward together, and avoid the probe from slipping and moving when measuring the reflected wave.

[0014] 3. The sensor in the present invention is built into the inner wall of the guide rail with a scale, which is located on the center line of the roller of the positioning device. By moving the detection probe, the roller of the fixing device is driven to rotate, and the sensor is triggered to send a distance signal to the digital display screen. This can solve the problems caused by the installation position of the pipe, the small operating space in the pipe, the dark ambient light, the inability to measure the probe position and read the measurement data, etc.

[0015] 4. The present invention is suitable for ultrasonic testing of the inner wall of fillet welds of different specifications with diameters between 100 mm and 159 mm in pressure vessels, and is also suitable for phased array testing, with a wide range of applications.

[0016] 5. The volume of the present invention is small, and the three circular parts of the nozzle bracket are all designed with variable diameters, which are scalable and easy to carry; they can be reused and have good economic performance; the working principle is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an in-service ultrasonic flaw detection device for inspecting the inner wall of an insertable pipe socket fillet weld of the present invention;

[0018] Figure 2 For the present invention Figure 1 The structural diagram at position Ⅰ (fixed device) in the structural diagram;

[0019] Figure 3 For the present invention Figure 2 Right side view of the guide rail with scale at position III in the structural diagram;

[0020] Figure 4 For the present invention Figure 3 The cross section of the guide rail with scale at position AA in the right view of the guide rail with scale;

[0021] Figure 5 For the present invention Figure 1 Front view of the connection between the variable diameter guide rail and the guide rail with scale at position II in the structural schematic diagram;

[0022] Figure 6 For the present invention Figure 1 The left view of the connection between the variable diameter guide rail and the guide rail with scale at position II in the structural diagram;

[0023] Figure 7 It is a front view of the present invention;

[0024] Figure 8 A top view of the present invention;

[0025] In the figure, 1-variable diameter ring; 2-digital display screen; 3-upper variable diameter guide rail; 4-pull rod; 5-guide rail with scale; 6-lower variable diameter guide rail; 7-detection probe; 8-probe fixing shaft; 9-roller; 10-sensor; 11-steel ball; 12-fixed chain. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] like Figures 1 to 8 As shown, the present invention is an in-service ultrasonic flaw detection device for the inner wall of the insert-type pipe seat fillet weld for butt joint between a pressure vessel body and a pipe (100mm≤OD≤159mm), comprising a pipe mouth bracket (a variable diameter ring 1, an upper variable diameter guide rail 3, a pull rod 4, a lower variable diameter guide rail 6, and a steel ball 11), a guide rail with a scale 5, a fixing chain 12, a positioning device (a probe fixing shaft 8, a roller 9), a sensor 10, and a digital display screen 2. The pipe mouth bracket can be The variable diameter ring 1 is connected to the upper variable diameter guide rail 3 and the lower variable diameter guide rail 6 through the collar at the end of the pull rod 4. The number of the guide rails 5 with scales is 2, which are symmetrically arranged along the two sides of the probe. The two ends of the guide rails with scales 5 are respectively embedded in the inner side of the upper variable diameter guide rail 3 and the lower variable diameter guide rail 6. The guide rails with scales 5 can slide circumferentially in the upper variable diameter guide rail 3 and the lower variable diameter guide rail 6 through the connection of the steel balls 12. The number of the steel balls 12 is 4, and each guide rail 5 with scales is connected to the upper variable diameter guide rail 3 and the lower variable diameter guide rail 6. There is one at each connection between the upper variable diameter guide rail 3 and the lower variable diameter guide rail 6. There are two fixed chains 12, which are respectively arranged at the two proximal ends of the guide rail with scale 5. When the probe is firmly fixed on the positioning device, the fixed chain 12 is connected to the two guide rails with scale 5 on the same side to fix the spacing between the two guide rails with scale 5 and to assist in fixing the connection stability of the detection probe 7. The positioning device is composed of a probe fixing shaft 8 and a roller 9, which is embedded in the inner side of the guide rail with scale 5. One end of the probe fixing shaft 8 is used to fasten the detection probe 7, and the other end is fixed to the roller 9. The roller 9 is driven to rotate by moving the probe 7. The sensor 10 is embedded in the inner side of the guide rail with scale 5, and the probe position and moving distance signal are generated by identifying the rotation trajectory of the roller 9. The digital display screen 2 is fixed at the connection between the variable diameter guide rail 3 and the guide rail with scale 5 on the nozzle bracket, and the signal transmitted by the conversion sensor 10 is displayed on the display screen 2 for direct reading. The device has a simple structure and can detect and accurately record the fillet welds of the pipes with inner diameters between 100mm and 159mm in pressure vessels from the inner wall. It does not require multiple detection confirmations, which can effectively improve the detection efficiency. It uses the digital display principle, and the reading of the probe moving distance is intuitive and has a reflective scale for comparison. The detection results are accurate and reliable. At the same time, the device can be scalable and adjustable in diameter, is easy to carry, has a simple principle, and is easy to operate.

[0028] The present invention is not limited to the above-mentioned embodiments. Simple changes, equivalent substitutions or modifications made by ordinary technicians in the field based on the above-mentioned concepts to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. An in-service ultrasonic flaw detection device for the inner wall of an inserted pipe socket fillet weld, characterized in that: It comprises a nozzle bracket, a guide rail with a scale (5), a positioning device, a sensor (10) and a digital display screen (2); wherein: Two guide rails with scales (5) are provided, and are symmetrically arranged on both sides of the position where the detection probe (7) is placed. The two ends of the guide rails with scales (5) are embedded in the variable diameter guide rails of the nozzle bracket and can slide in the circumferential direction. The positioning device is located in the guide rails with scales (5) and can move axially with the detection probe (7). The sensor (10) is built into the inner wall of the guide rails with scales (5) and is located at the center line position of the positioning device. The digital display screen (2) is fixed at the connection between the nozzle bracket and the guide rails with scales (5). The positioning device is located inside the scaled guide rail (5), comprises a roller (9) and a probe fixing shaft (8), and is symmetrically arranged inside the two scaled guide rails (5). One end of the probe fixing shaft (8) is used to fasten the detection probe (7), and the other end is fixed to the roller (9). The roller (9) is driven to rotate by the movement of the detection probe (7), thereby triggering the sensor (10) to generate a movement signal.

2. The in-service ultrasonic flaw detection device for the inner wall of the insertable pipe socket fillet weld according to claim 1 is characterized in that: The pipe mouth bracket comprises four tie rods (4), one variable diameter ring (1), two variable diameter guide rails of equal diameter and four steel balls (11). The tie rods (4) are respectively located between the variable diameter ring (1) and the variable diameter guide rail and between the two variable diameter guide rails. The tie rods (4) are connected to the variable diameter ring (1) and the variable diameter guide rail via a sleeve ring. The steel balls (11) are respectively embedded in the inner sides of the two variable diameter guide rails of equal diameter, with two balls on each side.

3. The in-service ultrasonic flaw detection device for the inner wall of the insertable pipe socket fillet weld according to claim 2 is characterized in that: The guide rail with a scale (5) comprises a guide rail, a scale and a fixed chain (12). The guide rail is fixed between two variable-diameter guide rails of equal diameter, and both ends are connected to the variable-diameter guide rails through steel balls (11) embedded in the variable-diameter guide rails. The scale is arranged on the surface of the guide rail for observing and measuring the position of the probe. The fixed chain is arranged near the end of the variable-diameter guide rail and is used to connect the two guide rails on the same side.

4. The in-service ultrasonic flaw detection device for the inner wall of the insertable pipe socket fillet weld according to claim 1 is characterized in that: The sensor (10) is located on the center line of the roller of the positioning device and is connected to the digital display screen (2) at the connection between the nozzle bracket and the guide rail with scale (5). It is used to identify the rotation direction of the roller (9) in the positioning device and the forward or backward distance of the detection probe (7) to generate a signal.

5. The in-service ultrasonic flaw detection device for the inner wall of the insertable pipe socket fillet weld according to claim 1 is characterized in that: The digital display screen (2) can slide along the circumferential direction of the variable diameter guide rail of the pipe mouth bracket along with the guide rail with scale (5), and is used for identifying the movement signal sent by the sensor (10) and converting the signal into digital data for display on the digital display screen (2).

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