An ultrasonic thickness measuring device for boiler heating surface tube row and its use method

Abstract

The present invention discloses an ultrasonic thickness measuring device for boiler heating surface tube row and its use method, which belongs to the technical field of boiler inspection and detection. It includes a handle, a host computer, a plurality of connecting rods and a plurality of detection units; the detection unit includes an arc detection wedge, a probe housing and an ultrasonic probe, the ultrasonic probe is fixed inside the probe housing, the ultrasonic probe is detachably connected to the arc detection wedge, and the curvature of the detection arc surface of the arc detection wedge matches the outer wall of the pipeline to be tested; the handle is connected to each probe housing through a connecting rod, and the host computer is connected to each ultrasonic probe through a signal line. The present invention can quickly and accurately complete the detection of the "four tubes" wall thickness of the power station boiler, and ensure the stability of the detection data through structural design; at the same time, no coupling agent is required during detection, which greatly saves costs; it can significantly improve work efficiency; it does not rely on the experience and skill level of the operator; it effectively improves the efficiency and accuracy of detection, and has good application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler inspection and detection, and relates to an ultrasonic thickness measuring device for a boiler heating surface tube bank and a use method thereof. Background Art

[0002] Boiler heating surfaces, headers and other equipment contain a large number of dense tube banks, and the steel pipes that make up the tube banks are mostly thin-walled steel pipes with large curvature. The actual thickness of the tube bank steel pipes is an important indicator for evaluating the life of the boiler heating surface. Thinning of the tube wall will lead to tube burst accidents during the later operation of the boiler. Therefore, the thickness of the above-mentioned steel pipes needs to be measured during the boiler safety performance inspection and installation supervision inspection.

[0003] Conventional "four-tube" wall thickness detection methods often use or The longitudinal wave straight probe is used to carry out ultrasonic testing of the wall thickness of the steel pipe. However, it is affected by factors such as the small contact area between the large curvature steel pipe and the probe, poor coupling, and slow response of the detection data due to thin wall thickness. There are a series of problems such as unstable detection values, low detection efficiency, and the detection results are greatly affected by human factors, which leave quality risks for the safe operation of important boiler equipment. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an ultrasonic thickness measuring device for boiler heating surface tube row and its use method, which can quickly and accurately complete the detection of the wall thickness of the "four tubes" of the power station boiler, and ensure the stability of the detection data through structural design; at the same time, no coupling agent is required during detection, which greatly saves costs.

[0005] The present invention is achieved through the following technical solutions:

[0006] The invention discloses an ultrasonic thickness measuring device for boiler heating surface tube banks, comprising a handle, a host computer, a plurality of connecting rods and a plurality of detection units;

[0007] The detection unit includes an arc-shaped detection wedge, a probe housing and an ultrasonic probe, wherein the ultrasonic probe is fixed inside the probe housing, the ultrasonic probe is detachably connected to the arc-shaped detection wedge, and the curvature of the detection arc surface of the arc-shaped detection wedge matches the outer wall of the pipeline to be detected;

[0008] The handle is connected to each probe housing through a connecting rod, and the host computer is connected to each ultrasonic probe through a signal line.

[0009] Preferably, the handle and the connecting rod are hingedly connected via a lockable hinge.

[0010] Preferably, the connecting rod and the handle are hollow, and the signal line passes through the connecting rod and the handle.

[0011] Preferably, an anti-slip sleeve is provided on the outer wall of the handle.

[0012] Preferably, the connecting rod is a telescopic rod.

[0013] Further preferably, a telescopic length mark is provided on the connecting rod.

[0014] Preferably, the arc-shaped detection wedge is connected to the ultrasonic probe by threads, and a limit device is provided between the two. When the two are tightened, the wafer dividing line of the ultrasonic probe is perpendicular to the tangent line of the outer wall of the pipeline to be tested.

[0015] Preferably, the host computer includes a plurality of display screens corresponding one-to-one to the detection units.

[0016] Preferably, the arc-shaped detection wedge is made of organic glass, and the probe housing, connecting rod and handle are all made of aluminum alloy.

[0017] The method for using the ultrasonic thickness measuring device for boiler heating surface tube bank disclosed in the present invention comprises:

[0018] S1: Fit the arc-shaped detection wedge to the heated surface tube row to be tested, turn on the host computer, and debug until the signal transmission is normal;

[0019] S2: Apply pressure through the handle to make each arc-shaped detection wedge fit tightly against the outer wall of the pipe in the heating surface pipe row;

[0020] S3: Drag the handle along the axial direction of the pipeline to drive all detection units to move linearly, so as to realize simultaneous detection of several groups of pipelines in the heating surface tube row.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The ultrasonic thickness measuring device for boiler heating surface tube row disclosed in the present invention can overcome the shortcomings of conventional ultrasonic thickness measuring technology in detecting large curvature tube row, such as small contact area, poor coupling, single point detection, and low efficiency. The bottom of the arc detection wedge is made into an arc surface that matches the steel pipe to be inspected, the probe and the wedge are combined, and several detection units are connected to the handle through a connecting rod to form an integral stable structure. During detection, the arc detection wedge is in contact with the outer wall of the tube, and a certain force is applied by the handle to ensure that the arc detection wedge is in close contact with the outer wall of the tube. By dragging the handle along the axial direction of the tube row, the simultaneous detection of different parts of several large curvature steel pipes can be achieved. The device has a reasonable structure, is easy to install and use, and has greatly improved detection efficiency and reduced labor intensity of employees compared with the prior art. At the same time, the probe does not directly contact the tube wall when working, which avoids the loss of the probe, does not need to apply coupling agent, and greatly saves costs. The wedge thickness is uniform, which ensures the accuracy of the probe detection data, reduces the safety risk of large curvature steel pipe operation, and has a good application prospect.

[0023] Furthermore, the handle and the connecting rod are hinged by a lockable hinge, which can be adjusted and locked according to actual conditions, thereby improving applicability.

[0024] Furthermore, the connecting rod and the handle are hollow, and the signal wires pass through the connecting rod and the handle, thereby preventing the signal wires from being entangled with each other and being damaged or destroyed.

[0025] Furthermore, an anti-slip cover is provided on the outer wall of the handle to improve the gripping performance and facilitate the application of force.

[0026] Furthermore, the connecting rod adopts a telescopic rod, and the length can be adjusted according to actual conditions to improve applicability.

[0027] Furthermore, telescopic length markings are provided on the connecting rods to facilitate operators to adjust several connecting rods synchronously.

[0028] Furthermore, the host computer includes a plurality of display screens corresponding to the detection units one by one, so that the operator can observe the detection signal fed back by each detection unit at the same time, which is highly efficient.

[0029] Furthermore, the probe housing, connecting rod and handle are all made of aluminum alloy, which has high strength and light weight.

[0030] The method for using the ultrasonic thickness measuring device for boiler heating surface tube array disclosed in the present invention is easy to operate, has strong applicability, can significantly improve work efficiency, is independent of the operator's experience and skill level, effectively improves detection efficiency and accuracy, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the use state of the present invention;

[0033] Figure 3 Schematic diagram of the connection structure between the connecting rod and the handle.

[0034] In the figure, 1 is an arc-shaped detection wedge, 2 is a probe housing, 3 is a connecting rod, 4 is a handle, 5 is a signal line, 6 is a host computer, 7 is an ultrasonic probe, and 8 is a detection unit. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0036] like Figure 1 , is an ultrasonic thickness measuring device for boiler heating surface tube bank of the present invention, comprising a handle 4, a host computer 6, a plurality of connecting rods 3 and a plurality of detection units 8;

[0037] The detection unit 8 includes an arc-shaped detection wedge 1, a probe housing 2 and an ultrasonic probe 7. The ultrasonic probe 7 is fixed inside the probe housing 2. The ultrasonic probe 7 is detachably connected to the arc-shaped detection wedge 1. The curvature of the detection arc surface of the arc-shaped detection wedge 1 matches the outer wall of the pipeline to be detected.

[0038] The handle 4 is connected to each probe housing 2 through a connecting rod 3 , and the host computer 6 is connected to each ultrasonic probe 7 through a signal line 5 .

[0039] In a preferred embodiment of the present invention, the handle 4 and the connecting rod 3 are hingedly connected via a lockable hinge.

[0040] In a preferred embodiment of the present invention, the connecting rod 3 and the handle 4 are hollow, and the signal line 5 passes through the connecting rod 3 and the handle 4 .

[0041] In a preferred embodiment of the present invention, the outer wall of the handle 4 is provided with an anti-slip cover, such as a silicone cover or a nylon cover with anti-slip patterns.

[0042] In a preferred embodiment of the present invention, the connecting rod 3 is a telescopic rod. Preferably, the connecting rod 3 is provided with a telescopic length mark.

[0043] In a preferred embodiment of the present invention, the arc-shaped detection wedge 1 is connected to the ultrasonic probe 7 by threads, and a limit device is provided between the two. When the two are tightened, the chip dividing line of the ultrasonic probe 7 is perpendicular to the tangent line of the outer wall of the pipeline to be tested.

[0044] In a preferred embodiment of the present invention, the host computer 6 includes a plurality of display screens corresponding one-to-one to the detection units 8 .

[0045] In a preferred embodiment of the present invention, the arc-shaped detection wedge 1 is made of organic glass, and the probe housing 2, the connecting rod 3 and the handle 4 are all made of aluminum alloy.

[0046] The method for using the ultrasonic thickness measuring device for boiler heating surface tube bank comprises:

[0047] S1: Tighten the probe 7 and the arc detection wedge 1 through threads, and connect them to the host computer 6 through the signal line 5; fit the arc detection wedge 1 to the heating surface pipe row to be tested, turn on the host computer 6, and debug until the signal transmission is normal;

[0048] S2: applying pressure through the handle 4 so that each arc-shaped detection wedge 1 is closely fitted to the outer wall of the pipe in the heating surface pipe row;

[0049] S3: Drag the handle 4 along the axial direction of the pipeline to drive all the detection units 8 to move linearly, so as to realize simultaneous detection of several groups of pipelines in the heating surface tube row.

[0050] The present invention is further explained below with a specific embodiment:

[0051] The arc-shaped detection wedge 1 is made of organic glass with a sound velocity of 2370m / s, and the bottom surface is processed into an arc surface matching the φ60mm water-cooled wall tube, ensuring that the electromagnetic ultrasonic wave emitted by the ultrasonic probe 7 is incident on the inside of the water-cooled wall tube at 0 degrees.

[0052] The back of the arc-shaped detection wedge 1 is processed into a threaded blind hole to be engaged with the ultrasonic probe 7, and the thickness from the arc center of the arc-shaped detection wedge 1 to the bottom of the blind hole is 2 mm.

[0053] The ultrasonic probe 7 is a circular electromagnetic ultrasonic probe with a bandwidth of 4.5 MHz and an excitation voltage of 1000 Vp-p. The front of the probe is processed with a thread corresponding to the threaded blind hole on the back of the arc-shaped detection wedge 1 .

[0054] The probe housing 2, the connecting rod 3 and the inner sleeve of the handle 4 are made of aluminum alloy. The connecting rod 3 and the handle 4 are hollow structures. The connecting rod 3 and the probe housing 2 are welded as a whole. Figure 3 The connecting rod 3 and the handle 4 are connected by a louver structure; the outside of the handle 4 is a rubber sleeve.

[0055] The ultrasonic probe 7 is connected to a connector of a signal line 5 arranged inside the probe housing 2 . The signal line 5 passes through the hollow space inside the connecting rod 3 and the handle 4 and is connected to the host computer 6 .

[0056] The upper computer 6 is a digital electromagnetic ultrasonic thickness gauge host computer, which displays three sets of detection data simultaneously on a split screen.

[0057] During the test, connect the ultrasonic probe 7, arc detection wedge 1, signal line 5, connecting rod 3, handle 4, and host computer 6 in the above order, and then check after starting the machine to ensure that the signal transmission is normal. Fit the arc detection wedge 1 to the outer wall of the φ60mm water-cooled wall tube. The operator applies pressure through the handle 4 to make the arc detection wedge 1 fit tightly to the three groups of water-cooled wall outer tubes. Figure 2 As shown, the operator can simultaneously complete the wall thickness detection of three groups of water-cooled wall tubes at different positions by dragging the handle 4 along the axial direction of the water-cooled wall tube row.

[0058] It should be noted that the above is only one of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are all included in the protection scope of the present invention. Those skilled in the art of the present invention can make similar substitutions for the specific examples described, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they are all within the protection scope of the present invention.

Claims

1. An ultrasonic thickness measuring device for boiler heating surface tube bank, characterized in that: It comprises a handle (4), a host computer (6), a plurality of connecting rods (3) and a plurality of detection units (8); The detection unit (8) comprises an arc-shaped detection wedge (1), a probe housing (2) and an ultrasonic probe (7), wherein the ultrasonic probe (7) is fixed inside the probe housing (2), the ultrasonic probe (7) is detachably connected to the arc-shaped detection wedge (1), and the curvature of the detection arc surface of the arc-shaped detection wedge (1) matches the outer wall of the pipeline to be detected; The handle (4) is connected to each probe housing (2) through a connecting rod (3), and the upper computer (6) is connected to each ultrasonic probe (7) through a signal line (5); pressure is applied through the handle (4) so ​​that each arc-shaped detection wedge (1) is tightly fitted to the outer wall of the pipe in the heating surface pipe row; the handle (4) is dragged along the axial direction of the pipe to drive all the detection units (8) to move linearly, thereby realizing simultaneous detection of several groups of pipes in the heating surface pipe row; The connecting rod (3) is a telescopic rod, and the upper computer (6) includes a plurality of display screens corresponding one to one with the detection units (8).

2. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: The handle (4) is hingedly connected to the connecting rod (3) via a lockable hinge.

3. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: The connecting rod (3) and the handle (4) are hollow, and the signal line (5) passes through the connecting rod (3) and the handle (4).

4. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: The outer wall of the handle (4) is provided with an anti-slip sleeve.

5. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: A telescopic length mark is provided on the connecting rod (3).

6. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: The arc-shaped detection wedge (1) is connected to the ultrasonic probe (7) via a thread, and a limit device is provided between the two. When the two are screwed together, the wafer dividing line of the ultrasonic probe (7) is perpendicular to the tangent line of the outer wall of the pipeline to be tested.

7. The ultrasonic thickness measuring device for boiler heating surface tube bank according to claim 1, characterized in that: The arc-shaped detection wedge (1) is made of organic glass, and the probe housing (2), the connecting rod (3) and the handle (4) are all made of aluminum alloy.

8. The method for using the ultrasonic thickness measuring device for boiler heating surface tube bank according to any one of claims 1 to 7, characterized in that: include: S1: Fit the arc-shaped detection wedge (1) to the heating surface tube row to be tested, turn on the host computer (6), and debug until the signal transmission is normal; S2: applying pressure through the handle (4) so ​​that each arc-shaped detection wedge (1) is closely fitted to the outer wall of the pipe in the heating surface pipe row; S3: dragging the handle (4) along the axial direction of the pipeline to drive all the detection units (8) to move linearly, thereby realizing simultaneous detection of several groups of pipelines in the heating surface tube row.

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