Probe of digital oxide skin detector

Abstract

The utility model relates to a probe of a digital oxide skin detector. Comprising two detection probes, each detection probe is internally provided with a magnet which generates a magnetic field through external added magnetic energy and is used for magnetizing a ferromagnetic oxide existing in an austenite steel pipe, and a Hall element which is used for detecting the stray magnetic field intensity of the detected oxide, and one end of each group of rotating arm and one end of each group of control arm are movably connected with the same detection probe. The control arm connected with the upper end of the detection probe is movably connected with the upper end of a tension spring hanging rod, a tension spring is hung in the middle of the tension spring hanging rod, and the lower end of the tension spring hanging rod is movably connected with the control arm connected with the lower end of the detection probe. The scale detection device has the characteristics of high detection speed, high sensitivity, simple structure, easiness in operation, high detection speed and the like, and is matched with a controller for use, so that scale detection data quantification can be realized, a detection report can be automatically generated, and the query is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of nondestructive testing, and particularly relates to a probe of a digital oxide skin detector for detecting the oxide skin inside the austenitic stainless steel pipeline of a power plant boiler. Background Technique

[0002] Due to the characteristics of high thermal strength, excellent corrosion resistance, good high-temperature mechanical properties and good weldability, austenitic stainless steel is widely used in large-scale power plant boilers. However, operation experience shows that the oxidation resistance of this type of stainless steel pipe at high temperature is poor during operation, and serious steam-side oxide skin peeling will occur during the operation of the superheater and reheater of the power plant boiler, resulting in blockage of the boiler pipe, serious overheating, and thus causing tube explosion accidents, which seriously affect the safe and stable operation of large-capacity, high-parameter, especially ultra (ultra) supercritical units.

[0003] The preventive measures often taken in boiler operation management include establishing an oxide skin ledger and using special detection instruments to detect quantitatively and quickly in a timely manner. These include:

[0004] 1) Endoscope inspection: large workload and low efficiency;

[0005] 2) Thickness measurement method: slow speed and unable to conduct a comprehensive inspection;

[0006] 3) Low-frequency eddy current detection method: prone to false detection and missed detection;

[0007] 4) Ray detection method, acoustic vibration method and residual magnetism method: detecting the oxide skin accumulation inside the boiler elbow. Due to the limitation of the tube row space, it is very difficult to conduct a comprehensive inspection by the ray detection method. The judgment of the detection result is subjective, and the ray is harmful to the human body, the detection cost is high, and the construction period is long; the acoustic vibration method uses the acoustic attenuation coefficient as the detection characteristic parameter and realizes the detection according to its relationship with the increase of the oxide skin accumulation amount. However, there are large differences in the acoustic vibration characteristics between the on-site boiler elbow and the standard sample tube, and it is difficult to guarantee the measured results.

[0008] Therefore, in order to ensure the safe operation of the unit, it is necessary to develop a device for detecting the oxide skin inside the boiler stainless steel pipeline, which has a fast detection speed, high sensitivity, is easy to operate, convenient for data management and subsequent query, and is also environmentally friendly, especially suitable for detecting the oxide skin inside the elbow of the boiler stainless steel pipeline. Summary of the Invention

[0009] To overcome the deficiencies existing in the above-mentioned prior art, the research group utilized the fact that austenitic stainless steel pipes are non-magnetic or weakly magnetic, while Fe2O3 and Fe3O4 in the scale are both strongly magnetic substances. Based on the relationship between the amount of scale accumulation on the inner wall of austenitic stainless steel pipes, the residual magnetic induction intensity, and the lifting force, a digital scale detector was developed. The digital scale detector consists of three parts: a probe, a connecting cable, and a controller. The present utility model is the probe of the digital scale detector.

[0010] To solve the above technical problems, the technical solution adopted by the present utility model is: a probe of a digital scale detector, which is characterized by including two detection probes;

[0011] Among them, the detection probe internally contains a magnet that can generate a magnetic field through external magnetization and is used to magnetize the strongly magnetic oxides existing in the austenitic steel pipe, and a Hall element for detecting the stray magnetic field intensity of the measured oxides;

[0012] Among them, a ball plunger for reducing the frictional force between the detection probe and the measured pipe wall during the movement and detection of the detection probe on the measured pipe wall is provided on the detection probe, and the ball plunger is fixed to the detection probe through a ball head bracket;

[0013] Among them, one end of the detection probe is movably connected to one end of 4 rotating arms through a set screw, and at the same time, one end of the detection probe is movably connected to one end of 4 control arms. The other ends of the 4 rotating arms are movably connected to the base through set screws, and the other ends of the 4 control arms are movably connected to the base through set screws;

[0014] Among them, the gears of the control arms connecting the left detection probe are engaged with the gears of the control arms connecting the right detection probe. Each group of rotating arms and control arms is movably connected to the same detection probe at one end and movably connected to the base at the other end, forming a parallelogram, and moving synchronously relying on the gear engagement of the control arms;

[0015] Among them, the control arm connected to the upper end of the detection probe is movably connected to the upper end of the spring hanging rod through a set screw. A spring for clamping the two detection probes is hung in the middle of the spring hanging rod, and the lower end of the spring hanging rod is movably connected to the control arm connected to the lower end of the detection probe through a set screw;

[0016] Among them, when the spring contracts or expands, the spring drives the two spring hanging rods to move inwards or outwards, and the spring hanging rods drive the control arms to move. Due to the gear engagement of the two control arms, the two control arms move synchronously, that is, the contraction or expansion amplitudes of the two detection probes remain the same;

[0017] Among them, an encoder housing and a code disk support are fixed on the ball head support. An encoder is built in the encoder housing. The code disk support is sleeved on the shaft of the code disk roller, and the shaft of the code disk roller is connected to the encoder.

[0018] Among them, a rotating shaft sleeve is sleeved on the shaft of the base. A base plug is arranged at the front end of the rotating shaft sleeve. The base plug is fixedly connected to the base. The rotating shaft sleeve can rotate and move on the base.

[0019] Among them, the rotating shaft sleeve is movably connected to a connecting seat for externally connecting a handle.

[0020] Among them, data of different amounts of induced magnetic field intensities collected by Hall elements built in the detection probe are transmitted to the controller through a connecting cable.

[0021] Among them, the detection probe is for increasing the contact surface with the measured pipe wall. The inner surfaces of the two opposite detection probes are concave arcs. The front end of the detection probe is a convex arc for facilitating the holding of the measured pipe.

[0022] Among them, there are 8 ball head plungers. Two are arranged at the upper end of each detection probe and two are arranged at the lower end. The ball head plungers can rotate and move on the detection probe.

[0023] Among them, the encoder built in the encoder housing gives the position of the measured point by calculating the distance between the code disk roller and the initial point. The initial point is set by the controller.

[0024] Among them, there are two tension spring hanging rods and two tension springs. The two tension springs are suspended between the two tension spring hanging rods in the upper and lower directions.

[0025] Among them, the range of movement of the connecting seat on the rotating shaft sleeve is 0 - 90 degrees.

[0026] Among them, the probe of the digital mill scale detector, the connecting cable and the controller form the digital mill scale detector.

[0027] By adopting the above technical solutions, the beneficial effects obtained by the present utility model are:

[0028] In summary, the probe of the digital mill scale detector of the present utility model has the characteristics of fast detection speed, high sensitivity, simple structure, easy operation, fast detection speed, small volume, light weight and environmental protection. When the probe of the digital mill scale detector is used in combination with the controller, the detection data can be quantified. The thickness of the mill scale and the percentage of the occupied pipe space can be directly displayed on the controller display screen. The accumulation position can be displayed graphically, and a detection report can be automatically generated to optimize data management and facilitate query. It can not only detect the mill scale inside the austenitic stainless steel pipe, but also detect ferromagnetic foreign matters from other sources.

[0029] The present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0030] Figure 1 It is a schematic structural view of the probe of the digital scale detector of the present utility model.

[0031] In the figure: 1 - pull spring hanging rod, 2 - pull spring, 3 - base plug, 4 - control arm, 5 - base, 6 - rotating shaft sleeve, 7 - set screw, 8 - connecting seat, 9 - rotating arm, 10 - encoder housing, 11 - code disk support, 12 - code disk roller, 13 - ball head support, 14 - ball head plunger, 15 - detection probe. Detailed Embodiment

[0032] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0033] As Figure 1 shown, the probe of the digital scale detector of the present utility model is characterized by including two detection probes 15.

[0034] In an embodiment of the present utility model, the detection probe 15 is internally provided with a magnet that can generate a magnetic field by external magnetization and is used to magnetize the strongly magnetic oxides existing in the austenitic steel pipe, and a Hall element for detecting the stray magnetic field intensity of the measured oxides. A certain constant magnetic field is applied outside the austenitic stainless steel pipe. If there is scale inside the pipe, the magnetic field generated by the magnet will magnetize the strongly magnetic oxides existing in the pipe, and then the Hall element is used to detect the intensity of the stray magnetic field from the oxides inside the pipe outside the pipe. By detecting the magnitude of the magnetic field intensity of the oxides inside the pipe, the amount of scale inside the pipe is finally reflected.

[0035] As Figure 1 shown, a ball head plunger 14 for reducing the friction between the detection probe 15 and the measured pipe wall when the detection probe 15 moves and detects on the measured pipe wall is arranged on the detection probe 15, and the ball head plunger 14 is fixed on the detection probe 15 through a ball head support 13.

[0036] As Figure 1 shown, one end of the detection probe 15 is movably connected to one end of 4 rotating arms 9 through a set screw 7, and at the same time, one end of the detection probe 15 is movably connected to one end of 4 control arms 4. The other ends of the 4 rotating arms 9 are movably connected to the base 5 through a set screw 7, and the other ends of the 4 control arms 4 are movably connected to the base 5 through a set screw 7.

[0037] In an embodiment of the present utility model, the gears of the control arms 4 connecting the left detection probe 15 are engaged with the gears of the control arms 4 connecting the right detection probe 15. Each set of swing arms 9 is movably connected to the same detection probe 15 at one end and movably connected to the base 5 at the other end, forming a parallelogram, and moving synchronously by the engagement of the gears of the control arms 4.

[0038] As Figure 1 shown, the control arm 4 connected to the upper end of the detection probe 15 is movably connected to the upper end of the tension spring hanging rod 1 by a dowel screw 7. A tension spring 2 for clamping the two detection probes 15 is hung in the middle of the tension spring hanging rod 1. The lower end of the tension spring hanging rod 1 is movably connected to the control arm 4 connected to the lower end of the detection probe 15 by a dowel screw 7.

[0039] In an embodiment of the present utility model, when the tension spring 2 contracts or expands, the tension spring 2 drives the two tension spring hanging rods 1 to move inwards or outwards. The tension spring hanging rods 1 drive the control arms 4 to move. Due to the engagement of the gears on the two control arms 4, the two control arms 4 move synchronously, that is, the contraction or expansion amplitudes of the two detection probes 15 remain the same.

[0040] As Figure 1 shown, an encoder housing 10 and a code disc support 11 are fixed on the ball head support 13.

[0041] In an embodiment of the present utility model, an encoder is built in the encoder housing 10. The code disc support 11 is sleeved on the shaft of the code disc roller 12, and the shaft of the code disc roller 12 is connected to the encoder.

[0042] As Figure 1 shown, a rotating shaft sleeve 6 is sleeved on the shaft of the base 5. A base plug 3 is arranged at the front end of the rotating shaft sleeve 6. The base plug 3 is fixedly connected to the base 5, and the rotating shaft sleeve 6 can rotate and move on the base 5.

[0043] As Figure 1 shown, the rotating shaft sleeve 6 is movably connected to a connecting seat 8 for externally connecting a handle.

[0044] In an embodiment of the present utility model, the data of different amounts of induced magnetic field intensities collected by the Hall elements built in the detection probes 15 are transmitted to the controller through connecting cables.

[0045] As Figure 1 shown, the detection probes 15 are to increase the contact surface with the measured pipe wall. The inner surfaces of the two detection probes 15 facing each other are concave arcs, and the front ends of the detection probes 15 are convex arcs for facilitating the clamping of the measured pipe.

[0046] In an embodiment of the present utility model, there are 8 ball head plungers 14, with two provided at the upper end and two provided at the lower end of each detection probe 15, and the ball head plungers 14 can rotate and move on the detection probes 15.

[0047] In an embodiment of the present utility model, the encoder built into the encoder housing 10 gives the position of the measured point by calculating the distance between the code disc roller 12 and the initial point, and the initial point is set by the controller.

[0048] As Figure 1 shown, there are two spring hanging rods 1 and two tension springs 2. The two tension springs 2 are suspended between the two spring hanging rods 1, one above the other.

[0049] In an embodiment of the present utility model, the range of movement of the connecting seat 8 on the rotating shaft sleeve 6 is 0 - 90 degrees.

[0050] In an embodiment of the present utility model, the probe, connecting cable, and controller of the digital mill scale detector form the digital mill scale detector.

[0051] In summary, the probe of the digital mill scale detector of the present utility model has the following advantages: It does not require surface treatment of the measured pipe wall, has a fast detection speed, can accurately reflect the minute changes in the amount of mill scale in the pipeline, has high sensitivity, a simple structure, is easy to operate, has a fast detection speed, is small in size, light in weight, and is environmentally friendly. When the probe of the digital mill scale detector is used in conjunction with the controller, it can quantify the detection data. The thickness of the mill scale and the percentage of the pipeline space occupied can be directly displayed on the controller display screen, and the accumulation position can be displayed graphically. It can automatically generate a detection report, optimize data management, and facilitate query. It can not only detect the mill scale inside austenitic stainless steel pipes but also detect ferromagnetic foreign objects from other sources. Using the digital mill scale detector can effectively detect the accumulation of mill scale inside austenitic stainless steel pipes, effectively prevent unit outages such as pipe bursts caused by mill scale blockage, and contribute to improving the efficiency of power plants and extending the service life of units.

[0052] The specific embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Without departing from the gist of the present utility model, various changes can be made within the knowledge scope of those of ordinary skill in the art.

Claims

1. A probe of a digital oxide scale detector, characterized in that comprising two detection probes (15); The detection probe (15) has a built-in magnet that generates a magnetic field by applying external magnetic energy and is used to magnetize the strong magnetic oxide present in the austenitic steel pipe, and a Hall element that is used to detect the stray magnetic field strength of the oxide being measured; The detection probe (15) is provided with a ball plunger (14) for reducing the friction between the detection probe (15) and the detected pipe wall when the detection probe (15) moves on the detected pipe wall for detection, and the ball plunger (14) is fixed to the detection probe (15) via a ball bracket (13); The detection probe (15) is movably connected to one end of the four rotating arms (9) via a plug screw (7), and the detection probe (15) is movably connected to one end of the four control arms (4), and the other end of the four rotating arms (9) is movably connected to the base (5) via a plug screw (7), and the other end of the four control arms (4) is movably connected to the base (5) via a plug screw (7); The gear of the control arm (4) connected to the left detection probe (15) meshes with the gear of the control arm (4) connected to the right detection probe (15); one end of each set of rotating arms (9) and the control arm (4) is movably connected to the same detection probe (15), and the other end is movably connected to the base (5), forming a parallelogram, and relying on the meshing of the gears of the control arm (4), the two arms move synchronously; The control arm (4) connected to the upper end of the detection probe (15) is movably connected to the upper end of the tension spring hanging rod (1) via a plug screw (7); a tension spring (2) for clamping the two detection probes (15) is hung in the middle of the tension spring hanging rod (1); the lower end of the tension spring hanging rod (1) is movably connected to the control arm (4) connected to the lower end of the detection probe (15) via a plug screw (7); When the tension spring (2) contracts or expands, the tension spring (2) drives the two tension spring hanging rods (1) to move inward or outward, and the tension spring hanging rod (1) drives the control arm (4) to move. Since the gears on the two control arms (4) are engaged, the two control arms (4) move synchronously, that is, the amplitudes of contraction or expansion of the two detection probes (15) remain the same; The ball head bracket (13) is fixed with an encoder housing (10) and a code disc bracket (11); the encoder housing (10) has a built-in encoder; the code disc bracket (11) is sleeved on the shaft of the code disc roller (12); and the shaft of the code disc roller (12) is connected to the encoder; Wherein, a rotating shaft sleeve (6) is disposed on the shaft of the base (5), a base plug (3) is disposed at the front end of the rotating shaft sleeve (6), the base plug (3) is fixedly connected to the base (5), and the rotating shaft sleeve (6) can rotate and move on the base (5); Wherein, the rotating shaft sleeve (6) is movably connected to a connecting seat (8) for an external handle.

2. The probe of the digital scale detector according to claim 1 is characterized in that The data of different quantities of induced magnetic field strengths collected by the Hall element built into the detection probe (15) are transmitted to the controller via a connecting cable.

3. The probe of the digital scale detector according to claim 1 is characterized in that In order to increase the contact surface between the detection probe (15) and the wall of the pipe to be detected, the inner surfaces of the two detection probes (15) facing each other are concave inwardly curved, and in order to facilitate holding the pipe to be detected, the front end of the detection probe (15) is convex inwardly curved.

4. The probe of the digital scale detector according to claim 1 is characterized in that There are eight ball plungers (14), two of which are arranged at the upper end and two at the lower end of each detection probe (15), and the ball plungers (14) are rotatable on the detection probe (15).

5. The probe of the digital scale detector according to claim 1 is characterized in that The encoder built into the encoder housing (10) gives the position of the measured point by calculating the distance between the code disc roller (12) and an initial point, and the initial point is set by a controller.

6. The probe of the digital oxide scale detector according to claim 1 is characterized in that There are two tension spring hanging rods (1), and there are two tension springs (2). The two tension springs (2) are suspended between the two tension spring hanging rods (1) at upper and lower positions.

7. The probe of the digital scale detector according to claim 1 is characterized in that The movable range of the connecting seat (8) on the rotating shaft sleeve (6) is 0-90 degrees.

8. The probe of the digital scale detector according to claim 1 is characterized in that The digital oxide scale detector comprises a probe, a connecting cable and a controller.

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