Scanning tool for detecting butt seam between connecting pipe and shell of heat exchanger

Abstract

The utility model discloses a scanning tool for detecting a butt seam between a heat exchanger connecting pipe and a shell. The scanning tool comprises a first cross beam; the left bracket and the right bracket are arranged on the first cross beam in a manner that the spacing distance between the left bracket and the right bracket is adjustable; the two probes are arranged on the corresponding supports in a left-right opposite mode respectively so as to be arranged on the two sides of a butt joint seam between the heat exchanger connecting pipe and the shell during scanning, and the two probes are provided with encoders used for receiving and storing detection data of the two probes. At least one of the two supports is provided with an inverted-U-shaped supporting part, the inverted-U-shaped supporting part is provided with a first supporting rod extending front and back and second supporting rods folded backwards and extending downwards from the two ends of the first supporting rod, and an inverted-U-shaped cavity with a downward opening is jointly formed between the two second supporting rods and the first supporting rod. And a corresponding probe can be arranged in the left-right rotating groove in a left-right rotating manner. According to the utility model, the quality of the butt joint can be accurately detected in a small space.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of detection equipment, and specifically relates to a scanning tool for detecting the butt joint between the connecting pipe and the shell of a heat exchanger. BACKGROUND

[0002] The welding seam between the connecting pipe and the shell in a spiral pipe heat exchanger generally adopts an embedded butt joint, which needs to be detected by 100% RT or TOFD. RT detection is not only difficult to shoot, but also low in efficiency, and it is difficult to meet the production demand in the manufacturing process. TOFD is a method for detecting internal defects of a test piece by relying on the diffraction energy obtained from the "end corner" and "end point" of the internal structure of the test piece. This detection method needs to use one or more pairs of ultrasonic probes. During detection, each pair of ultrasonic probes needs to be arranged symmetrically relative to the welding seam. The size and position of the internal defects of the test piece can be accurately obtained by measuring the propagation time difference of the diffraction wave. TOFD has great advantages in the detection of the production process of pressure vessels. It not only saves time and speeds up production, but also is environmentally friendly and has no radiation, and can be detected while producing.

[0003] The existing TOFD scanning frame, such as the Chinese utility model patent "TOFD scanning frame" (authorized publication number CN202814934U) with the application number 201220542042.4, comprises a scanning frame main beam, two mutually parallel "h" shaped supports are installed below the scanning frame main beam, the axis of the scanning frame main beam is perpendicular to the plane where the "h" shaped supports are located, two rollers are installed below each "h" shaped support, the axis of the roller is parallel to the axis of the scanning frame main beam, and an encoder and a probe are installed on the main beam.

[0004] For example, the Chinese utility model patent "Diffracted time difference method ultrasonic detection scanning frame" (authorized publication number CN207379981U) with the application number 201721476885.8, which comprises a scanning frame main body, two symmetrically arranged probe assemblies on one side of the scanning frame main body and connected with the scanning frame main body for detecting the size of the welding seam, a roller assembly fixedly connected to both ends of the scanning frame main body for easy sliding, an encoder assembly arranged on the scanning frame main body for receiving and storing signal data, an adjusting assembly arranged on the scanning frame main body for quickly adjusting the relative sliding motion of the two probe assemblies, the adjusting assembly comprises an adjusting rod inserted into the scanning frame main body and threadedly connected with the two probe assemblies for controlling the sliding of the two probe assemblies, the adjusting rod is provided with a first thread and a second thread threadedly connected with the two probe assemblies, and the first thread and the second thread are arranged in opposite screw directions.

[0005] In tube-wound heat exchangers, the diameter of the embedded butt joint between the tube and the shell is generally ≤500mm, and the distance between the embedded butt weld and the tube is ≤90mm, which is less than the distance of the existing TOFD scanning frame, making it difficult to meet the inspection requirements using the existing TOFD scanning frame. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a scanning tool for detecting the joint between the heat exchanger nozzle and the shell, in order to accurately detect the quality of the joint in a small space, in light of the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: a scanning tool for detecting the butt joint between the heat exchanger nozzle and the shell, comprising:

[0008] The first horizontal beam, with its length direction defined as the left-right direction;

[0009] Two supports, one on the left and one on the right, are mounted on the first crossbeam with an adjustable interval between them.

[0010] Two probes are mounted on their respective brackets, facing each other, to be positioned on both sides of the joint between the heat exchanger nozzle and the shell during scanning. They are also equipped with encoders for receiving and storing the detection data from the two probes.

[0011] Its features are:

[0012] At least one of the two supports has an inverted U-shaped support portion, which has a first support rod extending forward and backward, and a second support rod extending downward after being bent from both ends of the first support rod. The two second support rods and the first support rod together form an inverted U-shaped cavity with the opening facing downward, so that the corresponding probe can be rotatably placed in it around the forward and backward extending axis.

[0013] Compared to existing technologies, the inverted U-shaped support design of the bracket in this invention can constrain the probe and allow the probe to rotate left and right within the inverted U-shaped support to adjust the angle, thereby more accurately detecting the quality of the butt joint. At the same time, the cooperation between the inverted U-shaped support and the probe in this invention can reduce the distance between the two brackets during scanning, thereby shortening the length of the first crossbeam. This allows the scanning fixture of this invention to accurately detect the quality of the butt joint in a smaller space.

[0014] Preferably, the bracket with the inverted U-shaped support also has a connecting portion extending upward from the first support rod of the inverted U-shaped support, the connecting portion being constrained to the first crossbeam in a manner that allows it to move left and right.

[0015] More preferably, the connecting part is arranged on the first beam in a position adjustable relative to the up-down position of the first beam, so that the position of the support can be adjusted according to the detection environment.

[0016] To facilitate the adjustment of the position of the support, further, the connecting part has a strip-shaped hole extending through front and back and extending up and down, and further comprises a fastener connected to the first beam through the strip-shaped hole on the connecting part to abut the connecting part against the side of the first beam.

[0017] Further preferably, the side of the first beam has a slide groove extending left and right, and a slide block movably constrained in the slide groove, the slide block having a first threaded hole extending through front and back.

[0018] The fastener is a first screw, and the shank of the first screw is threadedly connected to the first threaded hole of the slide block through the strip-shaped hole on the connecting part.

[0019] In the above-mentioned solutions, to facilitate the constraint of the probe, preferably, the lower end of each of the two second support rods has a second threaded hole extending through front and back; and further comprising two second screws, the shanks of the two second screws are opposite to each other and are threadedly connected in the respective corresponding second threaded holes respectively to clamp the probe between the two second support rods. In this way, the disassembly and assembly of the probe can be realized by rotating the second screw, and the angle of the probe can be adjusted.

[0020] Preferably, further comprising a light source arranged on the first beam between the two supports and capable of emitting light downward to have a light spot on the joint during scanning. During scanning, the light spot is always on the center of the joint or a calibrated arc, so that calibration is facilitated, and the probe is prevented from deviating from the joint during the movement of the scanning tool to affect the scanning result.

[0021] In the above-mentioned solutions, preferably, further comprising a second beam extending front and back, one end of the second beam is connected to one end of the first beam to arrange the second beam and the first beam in an L shape, and the encoder is arranged on the second beam, and when only one of the two supports has a reverse U-shaped support part, the reverse U-shaped support part is away from the one end of the first beam. The design of the second beam in the utility model does not affect the detection of the probe, and facilitates the movement of the scanning tool in a smaller space.

[0022] Preferably, a handle part is arranged on the second beam to be held by the hand of an operator to drive the second beam to move. Of course, in addition thereto, the operator can directly hold the second beam to drive the second beam to move.

[0023] To facilitate movement, preferably, the second beam and / or the first beam is / are provided with a roller for supporting the movement of the corresponding beam.

[0024] Compared with the prior art, the advantages of the utility model lie in: compared with the prior art, the inverted U-shaped support part of the bracket in the utility model can constrain the probe, and the probe can rotate left and right in the inverted U-shaped support part to adjust the angle, so as to detect the quality of the butt joint more accurately, meanwhile, the cooperation of the inverted U-shaped support part and the probe in the utility model can reduce the distance between the two brackets during scanning, thereby the length of the first cross beam can be shortened (about 180mm shorter than normal), so that the scanning tool of the utility model can accurately detect the quality of the butt joint in a smaller space. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the utility model embodiment;

[0026] Figure 2 It is a structure schematic view of the utility model embodiment from another visual angle;

[0027] Figure 3 It is a structure schematic view of the utility model embodiment from still another visual angle;

[0028] Figure 4 It is a structure schematic view of the utility model embodiment from still another visual angle;

[0029] Figure 5 It is a sectional view of the utility model embodiment. DETAILED DESCRIPTION

[0030] The utility model will be described further in detail below in combination with the embodiment of the drawings.

[0031] As shown in the figure, it is a preferred embodiment of the scanning tool for detecting the butt joint between the heat exchanger connecting pipe and the shell of the utility model, which comprises a first cross beam 1, a bracket 2, a probe 3, an encoder 4, a light source 5, a second cross beam 6 and a roller 7. Figures 1-5 The length direction of the first cross beam 1 is the left-right direction. The front and back sides of the first cross beam 1 are both provided with the left-right extending sliding groove 11, and the sliding block 12 which can slide and constrain in the sliding groove 11, and the sliding block 12 has the front and back through first threaded hole 120.

[0032]

[0033] ​The two supports 2 are arranged on the front side of the first beam 1, and the interval distance between the two supports 2 is adjustable. In the embodiment, the two supports 2 are the same in structure, and each has an inverted U-shaped support part 2a and a connecting part 2b. The inverted U-shaped support part 2a has a first support rod 21 extending forward and backward, and a second support rod 22 extending downward from the two ends of the first support rod 21. The two second support rods 22 and the first support rod 21 together form an inverted U-shaped cavity with an opening downward. The connecting part 2b extends upward from the first support rod 21 of the inverted U-shaped support part 2a, and has a strip-shaped hole 23 extending upward and downward and penetrating through the front and back. The first screw, as a fastener 24, has a rod part screwing into a first threaded hole 120 of the sliding block 12 through the strip-shaped hole 23 on the connecting part 2b, and a head part abutting the connecting part 2b against the front side of the first beam 1. By loosening the first screw, the left-right and up-down positions of the connecting part 2b relative to the first beam 1 can be adjusted. For details, see Figure 5 The new support in the embodiment can be used to install a small probe. The wafer in the small probe is small in size and low in energy. The smaller the wafer size, the narrower the sound beam in the near distance range, which is beneficial to defect positioning and more suitable for detecting butt joints with large concave-convex degree and small curvature radius. Of course, when the detection space allows, one support can use the new support in the embodiment, and the other support can still use the existing conventional large support to meet the installation of a large probe.

[0034] The two probes 3 are arranged on the respective supports 2 opposite to each other on the left and right, respectively, to be arranged on both sides of the butt joint between the heat exchanger connecting pipe and the shell during scanning. In the embodiment, the lower end of each second support rod 22 of the support 2 has a second threaded hole 220 penetrating through the front and back, and two second screws 25 are arranged correspondingly. The rod parts of the two second screws 25 are screwed into the respective second threaded holes 220 opposite to each other to clamp the probe 3 between the two second support rods 22. When the two second screws 25 are loosened, the probe 3 constrained between the two second screws 25 can rotate around the axis extending forward and backward to adjust the angle. For details, see Figure 5 .

[0035] The second crossbeam 6 extends forward and backward, and one end of the second crossbeam 6 is connected with one end of the first crossbeam 1 so that the second crossbeam 6 and the first crossbeam 1 are arranged in an L shape. The second crossbeam 6 is provided with the encoder 4 for receiving and storing the detection data of the two probes 3. Meanwhile, the second crossbeam 6 is provided with a handle part 61 for the operator to hold the handle part 61 with the hand to drive the second crossbeam 6 and the first crossbeam 1 to move. Moreover, the second crossbeam 6 and the first crossbeam 1 are both provided with the rollers 7 for supporting the movement of the corresponding crossbeam. The rollers 7 on the second crossbeam 6 are constrained on the outer side of the encoder 4. The rollers 7 on the first crossbeam 1 are arranged on the bottom of the support frame 8 on the rear side of the first crossbeam 1, and the structure of the support frame 8 and the connecting structure between the support frame 8 and the first crossbeam 1 are the same as the connecting structure between the support frame 2 and the first crossbeam 1, which will not be repeated here.

[0036] The light source 5 is arranged on the first crossbeam 1 between the two support frames 2, and can emit light downward so that the light spot is on the joint during scanning. In this way, when the joint between the heat exchanger pipe and the shell is detected by using the scanning tool of the embodiment, the two probes 3 can be arranged symmetrically with respect to the joint, the light emitted by the light source 5 is aligned with the joint to form a light spot on the joint, and then the scanning tool is moved along the joint. During the movement, it is only necessary to ensure that the light spot is always on the joint to ensure the detection accuracy.

[0037] In the description and claims of the present application, terms are used to describe various example structures and elements of the present application as set forth in the examples. These terms are used only to facilitate description of the examples and are in no way intended to limit the scope of the application. For example, the terms "front," "back," "up," "down," "left," "right," "side," "top," "bottom," and the like are used only to describe the relevant example orientation as shown in the figures and are in no way intended to limit the scope of the application. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating the direction are only used for description and should not be regarded as limitation. For example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

Claims

1. A scanning fixture for inspecting the joint between a heat exchanger nozzle and its shell, comprising: First horizontal beam (1), the length direction of the first horizontal beam (1) is defined as the left and right direction; Two supports (2) on the left and right are set on the first crossbeam (1) with an adjustable interval between them; Two probes (3) are respectively mounted on their respective brackets (2) facing each other, so as to be arranged on both sides of the joint between the heat exchanger nozzle and the shell during scanning, and equipped with an encoder (4) for receiving and storing the detection data of the two probes (3). Its features are: At least one of the two supports (2) has an inverted U-shaped support (2a) with a first support rod (21) extending forward and backward, and a second support rod (22) extending downward after being bent from both ends of the first support rod (21). The two second support rods (22) and the first support rod (21) together form an inverted U-shaped cavity with the opening facing downward, so that the corresponding probe (3) can be placed in it to rotate left and right around the forward and backward axis.

2. The scanning fixture according to claim 1, characterized in that: The bracket (2) with the inverted U-shaped support (2a) also has a connecting part (2b) extending upward from the first support rod (21) of the inverted U-shaped support (2a), the connecting part (2b) being constrained to the first crossbeam (1) in a manner that allows it to move left and right.

3. The scanning fixture according to claim 2, characterized in that: The connecting part (2b) is provided on the first crossbeam (1) in such a way that its vertical position relative to the first crossbeam (1) is adjustable.

4. The scanning fixture according to claim 3, characterized in that: The connecting part (2b) has a through-hole (23) extending from front to back and from top to bottom, and also includes a fastener (24). The fastener (24) passes through the through-hole (23) on the connecting part (2b) and is connected to the first crossbeam (1) to press the connecting part (2b) against the side of the first crossbeam (1).

5. The scanning fixture according to claim 4, characterized in that: The first crossbeam (1) has a sliding groove (11) extending to the left and right on its side, and a slider (12) that can be slidably constrained in the sliding groove (11). The slider (12) has a first threaded hole (120) that runs through the front and back. The fastener (24) is a first screw, the shank of which passes through the strip hole (23) on the connecting part (2b) and is threaded to the first threaded hole (120) of the slider (12).

6. The scanning fixture according to claim 1, characterized in that: The lower ends of the two second support rods (22) each have a second threaded hole (220) that runs through the front and back; and also include two second screws (25), the shanks of the two second screws (25) are opposite each other and threaded into their respective second threaded holes (220) to clamp the probe (3) between the two second support rods (22).

7. The scanning fixture according to claim 1, characterized in that: It also includes a light source (5), which is located on the first crossbeam (1) between the two supports (2) and can emit light downwards so that there are light spots on the seam during scanning.

8. The scanning fixture according to any one of claims 1 to 7, characterized in that: It also includes a second crossbeam (6) extending forward and backward, one end of the second crossbeam (6) being connected to one end of the first crossbeam (1) so that the second crossbeam (6) and the first crossbeam (1) are arranged in an L-shape. The encoder (4) is mounted on the second crossbeam (6), and when only one of the two supports (2) has an inverted U-shaped support (2a), the inverted U-shaped support (2a) is located away from the end of the first crossbeam (1).

9. The scanning fixture according to claim 8, characterized in that: The second crossbeam (6) is provided with a handle (61) so that the operator can lift it with his hand and move the second crossbeam (6).

10. The scanning fixture according to claim 8, characterized in that: The second crossbeam (6) and / or the first crossbeam (1) are provided with rollers (7) for supporting the movement of the corresponding crossbeam.

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