Hand-held ultrasonic phased array automatic detection device for welding seam of pipe and pipe plate

Abstract

The invention discloses a handheld tube and tube plate weld ultrasonic phased array automatic detection device, which comprises a scanning main body, the scanning main body comprises a supporting seat, and a hollow shaft in running fit with the supporting seat and a rotation driving mechanism for driving the hollow shaft to rotate are arranged in the supporting seat; the front end of the hollow shaft is provided with a connecting seat, and the connecting seat is provided with a detection shaft. The supporting seat is sleeved with a height adjusting seat, the height adjusting seat comprises a connecting part used for being connected with the supporting seat and a limiting sleeve arranged outside the detection shaft in a sleeving mode, and the end face of the front end of the limiting sleeve is provided with a sealing gasket used for being matched with the tube plate in a sealing mode. The front end of the detection shaft is provided with a connector, the connector is provided with a centering sealing device in running fit with the connector, the centering sealing device is used for being in sealing fit and centering fit with a to-be-detected pipeline, and a liquid storage area used for storing coupling liquid is formed between the limiting sleeve and the centering sealing device; the detection shaft is provided with a detection probe located between the limiting sleeve and the centering sealing device.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic non-destructive testing, and specifically relates to a handheld ultrasonic phased array automatic testing device for tube-to-tubesheet welds. Background Art

[0002] In the manufacturing stage, defects such as pores, lack of fusion, and cracks are prone to occur in the tube-to-tubesheet fillet joints of shell-and-tube heat exchangers, reactors, air coolers, waste heat boilers, quenchers, etc. (hereinafter collectively referred to as "heat exchangers"). Statistics show that the leakage rate of heat exchanger tube-to-tubesheets is as high as 15 - 18% before detection, while it can be reduced to 1.5 - 4% after detection. Among them, pores are the main cause of corrosion leakage.

[0003] During the use of heat exchangers, the tube-to-tubesheets are subjected to high temperature differences, high pressure differences, and alternating loads. For example, equipment such as waste heat boilers and quenchers often bear high temperature differences (greater than 300 °C), high pressure differences, or cyclic loads. Weld defects are prone to expand into through-cracks under these usage scenarios. Some heat exchanger equipment has high-medium danger, and may involve highly toxic, flammable, or corrosive media (such as petrochemical reactors). Leakage may cause explosions, environmental pollution, or poisoning of personnel. Therefore, it is necessary to detect the tube-to-tubesheet welds to improve safety performance.

[0004] However, the specifications of the heat exchange tubes of heat exchangers are mostly with an inner diameter of 15 - 74 mm and a thickness of 2 - 8 mm. It is difficult for the conventional form of ultrasonic probe + wedge to enter the heat exchange tubes for detection. At the same time, due to the poor surface condition of the inner wall of the heat exchange tubes, the use of contact methods will cause poor coupling. In addition, there are a large number of heat exchange tubes, and it is necessary to improve the detection efficiency, and at the same time reduce the manual operation difficulty and fatigue. Of course, there is no mature ultrasonic scanning device using phased array technology to detect tube-to-tubesheet welds. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a handheld ultrasonic phased array automatic testing device for tube-to-tubesheet welds, which can solve the problem that it is difficult to detect tube-to-tubesheet welds due to the small size of the pipeline to be tested, and can effectively improve the detection accuracy and detection efficiency, and reduce the manual operation difficulty.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A handheld ultrasonic phased array automatic testing device for tube-to-tubesheet welds, including a scanning main body, the scanning main body includes a support base, a hollow shaft rotatably fitted in the support base and a rotation driving mechanism for driving the hollow shaft to rotate; a connecting seat is installed at the front end of the hollow shaft, and a detection shaft is installed on the connecting seat; The support seat is sleeved with a height adjustment seat, the height adjustment seat comprises a connection portion for connecting with the support seat and a limit sleeve sleeved outside the detection shaft, and a sealing gasket for sealing with the tube sheet is provided on the front end surface of the limit sleeve; A connector is provided at the front end of the detection shaft, and a centering sealing device is installed on the connector to rotate with the connector. The centering sealing device is used for sealing and centering with the pipeline to be tested. A liquid storage area for storing coupling liquid is formed between the limit sleeve and the centering sealing device. The detection shaft is provided with a detection probe located between the limit sleeve and the centering sealing device.

[0007] Furthermore, the rotation drive mechanism includes a fixedly installed motor, and the motor is transmission-connected to the hollow shaft via a gear transmission mechanism.

[0008] Furthermore, it also includes a motor control circuit, to which a speed regulating knob for controlling the motor speed and a forward button and a reverse button for controlling the motor rotation direction are connected.

[0009] Furthermore, an encoder for detecting the rotational position of the hollow shaft is provided in the support seat.

[0010] Furthermore, the connecting portion is configured as a clamp, and the clamp is sleeved outside the support seat; a connecting arm is provided on the clamp, and the limiting sleeve is arranged at the front end of the connecting arm.

[0011] Furthermore, the centering sealing device includes a centering body for centering the pipe to be tested and a sealing seat for sealing the pipe to be tested; at least three mounting seats arranged in the axial direction are evenly distributed on the outer peripheral wall of the centering body, and a centering wheel for rotating with the mounting seat is installed on the mounting seat; at least one annular groove is provided on the outer wall of the sealing seat, and a sealing ring is provided in the annular groove.

[0012] Furthermore, the sealing seat is located at the rear end of the centering body, and a central through hole for cooperating with the connecting head is provided in the sealing seat, and a bearing located between the connecting head and the sealing seat is provided in the central through hole, and a limiting cooperation is performed between the rear end of the bearing and the sealing seat, and a transition body for axially limiting the bearing is installed at the front end of the sealing seat, and the transition body is located between the sealing seat and the centering body.

[0013] Furthermore, the height adjustment seat is also equipped with an auxiliary positioning device, which includes an auxiliary mounting seat connected to the height adjustment seat, and the auxiliary mounting seat is provided with at least one auxiliary positioning unit for positioning and cooperating with other pipelines adjacent to the pipeline to be tested.

[0014] Further, the auxiliary positioning unit includes an expansion positioning component and an expansion adjustment component; the expansion positioning component includes a fixed cone seat that is in limit fit with the auxiliary mounting seat, a movable cone seat that can move axially relative to the fixed cone seat, and an expansion sleeve located between the fixed cone seat and the movable cone seat; first and second conical surfaces that cooperate with the expansion sleeve are respectively provided on the outer walls of the fixed cone seat and the movable cone seat, the outer diameter of the first conical surface gradually increases along the front-to-back direction, and the outer diameter of the second conical surface gradually decreases along the front-to-back direction; the expansion sleeve is divided into at least three petals along the generatrix direction, and at least one circumferential installation groove is provided at intervals on the outer wall of the expansion sleeve, and an elastic ring is sleeved in the installation groove; the expansion adjustment component is used to adjust the position of the movable cone seat moving axially relative to the fixed cone seat to control the expansion outer diameter of the expansion sleeve.

[0015] Further, the expansion adjustment component includes an adjustment screw rod, the front end of the adjustment screw rod extends through the fixed cone seat and is in threaded fit with the movable cone seat, the rear end of the adjustment screw rod extends through the auxiliary mounting seat and is provided with an adjustment handle, a screw rod seat that rotatably cooperates with the adjustment screw rod is provided on the auxiliary mounting seat, and a rotary bearing is provided between the fixed cone seat and the adjustment screw rod.

[0016] The beneficial effects of the present invention are as follows: For the ultrasonic phased array automatic detection device for the weld of the tube and tube sheet of the handheld pipe of the present invention, by arranging a hollow shaft in the support seat and installing a detection shaft on the hollow shaft, in this way, the detection shaft can be used to extend into the corresponding pipeline to be detected to detect the weld of the tube and tube sheet, and the problem that it is difficult to detect the weld of the tube and tube sheet caused by the small size of the pipeline to be detected can be solved; by arranging a height adjustment seat on the support seat and arranging a limit sleeve sleeved outside the detection shaft on the height adjustment seat, and using the sealing gasket arranged on the front end face of the limit sleeve, the technical purpose of sealing cooperation with the tube sheet can be achieved; by arranging a connecting head at the front end of the detection shaft and installing a centering and sealing device on the connecting head, the centering and sealing device is in sealing cooperation and centering cooperation with the pipeline to be detected. On the one hand, the detection shaft can be located at the center of the pipeline to be detected, and on the other hand, a liquid storage area for storing coupling liquid can be formed between the limit sleeve and the centering and sealing device. In this way, the detection probe can be prevented from contacting the inner wall of the pipeline to be detected, and the problem of poor coupling caused by the poor surface condition of the inner wall of the pipeline to be detected can be solved; during the detection process, by driving the hollow shaft to rotate one week by the rotation driving mechanism, the detection of the weld of the tube and tube sheet around one week can be realized, and manual operation is not required, which can reduce the difficulty of manual operation; in summary, the ultrasonic phased array automatic detection device for the weld of the tube and tube sheet of the handheld pipe of the present invention can solve the problem that it is difficult to detect the weld of the tube and tube sheet caused by the small size of the pipeline to be detected, and can effectively improve the detection accuracy and detection efficiency and reduce the difficulty of manual operation. Description of the Drawings

[0017] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a schematic structural diagram of the ultrasonic phased array automatic detection device for the weld of the hand-held pipe and tube sheet of the present invention; Figure 2 It is a schematic structural diagram of the scanning main body; Figure 3 It is a three-dimensional view of the scanning main body; Figure 4 It is a three-dimensional view of the centering and sealing device; Figure 5 It is a partial cross-sectional view of the centering and sealing device; Figure 6 It is a three-dimensional view of the auxiliary positioning device; Figure 7 It is a partial cross-sectional view of the auxiliary positioning device; Figure 8 It is a reference diagram of the usage state of the ultrasonic phased array automatic detection device for the weld of the hand-held pipe and tube sheet in this embodiment.

[0018] Explanation of reference numerals: 1 - tube sheet; 2 - pipeline to be measured; 3 - pipeline; 4 - weld of pipe and tube sheet; 10 - scanning main body; 11 - support base; 12 - hollow shaft; 13 - connecting seat; 14 - detection shaft; 141 - connecting head; 15 - bearing; 16 - bearing; 17 - motor base; 18 - motor; 19 - driving gear; 20 - driven gear; 21 - speed regulation knob; 22 - forward rotation button; 23 - reverse rotation button; 24 - charging connector; 25 - encoder connector; 26 - height adjustment base; 261 - connecting part; 262 - limiting sleeve; 263 - sealing washer; 264 - connecting arm; 27 - rear cover; 30 - centering and sealing device; 31 - centering main body; 32 - sealing seat; 321 - central through hole; 322 - bearing; 33 - transition body; 34 - mounting seat; 35 - centering wheel; 36 - sealing ring; 40 - auxiliary positioning device; 41 - auxiliary mounting seat; 42 - auxiliary positioning unit; 43 - fixed cone seat; 431 - first conical surface; 44 - movable cone seat; 441 - second conical surface; 45 - expansion sleeve; 451 - mounting groove; 452 - third conical surface; 453 - fourth conical surface; 46 - elastic ring; 47 - adjusting screw; 471 - threaded section; 472 - smooth shaft section; 48 - adjusting handle; 49 - screw seat; 50 - rotating bearing. Detailed implementation manners

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0020] like Figure 1 As shown, the handheld ultrasonic phased array automatic detection device for pipe and tube sheet welds of this embodiment includes a scanning body 10, a centering and sealing device 30, and an auxiliary positioning device 40. The centering and sealing device 30 is used to achieve centering and sealing cooperation with the pipeline 2 to be tested. The auxiliary positioning device 40 is used to assist in the positioning of the ultrasonic probe, and is used for positioning and cooperation with other pipelines 3 adjacent to the pipeline 2 to be tested.

[0021] like Figures 2-3 As shown, the scanning body 10 of this embodiment includes a support seat 11, a hollow shaft 12 rotatably matched with the support seat 11 and a rotation driving mechanism for driving the hollow shaft 12 to rotate are arranged in the support seat 11, a connecting seat 13 is installed at the front end of the hollow shaft 12, and a detection shaft 14 is installed on the connecting seat 13. In this embodiment, a bearing 15 and a bearing 16 are arranged between the support seat 11 and the hollow shaft 12. A detection probe is installed on the detection shaft 14, and the connection line of the detection probe is led out through the hollow shaft 12.

[0022] In this embodiment, a motor base 17 is installed on the support base 11, and the rotation drive mechanism includes a motor 18 fixedly installed in the motor base 17, and the motor 18 is connected to the hollow shaft 12 through a gear transmission mechanism. Specifically, in this embodiment, a driving gear 19 is installed on the output shaft of the motor 18, and a driven gear 20 that rotates synchronously with the motor 18 is installed on the hollow shaft 12, and the driving gear 19 and the driven gear 20 are meshed with each other.

[0023] In a preferred implementation of the present embodiment, the rotation drive mechanism of the present embodiment further includes a motor control circuit, to which a speed knob 21 for controlling the speed of the motor 18 and a forward button 22 and a reverse button 23 for controlling the direction of the motor 18 are connected. Specifically, a rear cover 27 is installed on the motor base 17 of the present embodiment, the speed knob 21 is arranged on the rear end surface of the rear cover 27, and the forward button 22 and the reverse button 23 are arranged on the side of the motor base 17. A battery for powering the motor 18 is arranged inside the rear cover 27 of the present embodiment, and a charging connector 24 for charging the battery is arranged on the rear cover 27. In this way, during the detection process, the speed of the motor 18 can be adjusted by the speed knob 21, and the direction of the motor 18 can be adjusted by the forward button 22 and the reverse button 23.

[0024] In a preferred embodiment of the present embodiment, an encoder for detecting the rotational position of the hollow shaft 12 is provided inside the support base 11, and the encoder is in contact and cooperation with the hollow shaft 12. An encoder connector 25 connected to the encoder is provided on the rear cover 27 of the present embodiment. By providing the encoder, the position information of the scanning data can be accurately recorded.

[0025] In the present embodiment, a height adjustment base 26 is sleeved on the support base 11. The height adjustment base 26 includes a connection portion 261 for connecting with the support base 11 and a limit sleeve 262 sleeved outside the detection shaft 14. A sealing washer 263 for sealing and cooperating with the tube sheet 1 is provided on the front end face of the limit sleeve 262. In the present embodiment, the connection portion 261 is set as a hoop, and the hoop is sleeved outside the support base 11. A connection arm 264 is provided on the hoop of the present embodiment, and the limit sleeve 262 is arranged at the front end of the connection arm 264.

[0026] In the present embodiment, a connection head 141 is provided at the front end of the detection shaft 14, and the centering and sealing device 30 is rotatably and cooperatively installed on the connection head 141. The centering and sealing device 30 of the present embodiment is used for sealing and centering cooperation with the pipeline 2 to be measured. A liquid storage area for storing coupling liquid is formed between the limit sleeve 262 and the centering and sealing device 30, and a detection probe located between the limit sleeve 262 and the centering and sealing device 30 is provided on the detection shaft 14. The centering and sealing device 30 of the present embodiment is detachably installed on the connection head 141. Thus, according to the inner diameter change of the pipeline 2 to be measured, a suitable centering and sealing device 30 can be replaced.

[0027] Thus, after the centering and sealing device 30 is inserted into the pipeline 2 to be measured, by using the centering cooperation relationship between the centering and sealing device 30 and the pipeline 2 to be measured, the detection shaft 14 can be located in the middle of the pipeline 2 to be measured; by using the sealing cooperation relationship between the centering and sealing device 30 and the pipeline 2 to be measured and the sealing cooperation relationship between the limit sleeve 262 and the tube sheet 1, coupling liquid can be injected into the liquid storage area, and the detection probe can achieve non-contact coupling with the inner wall of the pipeline 2 to be measured through the coupling liquid, which can solve the problem of poor coupling caused by the bad surface condition of the inner wall of the pipeline 2 to be measured.

[0028] As Figure 4 shown, in the present embodiment, the centering and sealing device 30 includes a centering main body 31 for centering cooperation with the pipeline 2 to be measured and a sealing seat 32 for sealing cooperation with the pipeline 2 to be measured. Specifically, at least three mounting seats 34 arranged along the axial direction are annularly and uniformly arranged on the outer peripheral wall of the centering main body 31, and centering wheels 35 rotatably cooperating with the mounting seats 34 are installed on the mounting seats 34. By using the annularly and uniformly arranged centering wheels 35, the resistance of the centering main body 31 inserted into the pipeline 2 to be measured can be reduced and centering can be achieved. At least one annular groove is provided on the outer wall of the sealing seat 32 of the present embodiment, and a sealing ring 36 is provided in the annular groove. The sealing seat 32 can be in sealing cooperation with the pipeline 2 to be measured through the sealing ring 36. Specifically, asFigure 5 As shown in the figure, the sealing seat 32 of this embodiment is located at the rear end of the centering main body 31. A central through hole 321 for cooperating with the connector 141 is provided in the sealing seat 32. A bearing 322 located between the connector 141 and the sealing seat 32 is provided in the central through hole 321. The rear end of the bearing 322 is in a limiting fit with the sealing seat 32. A transition body 33 for axially limiting the bearing 322 is installed at the front end of the sealing seat 32. The transition body 33 is located between the sealing seat 32 and the centering main body 31. In this way, the connector 141 and the sealing seat 32 can be rotationally matched, that is, the centering and sealing device 30 will not affect the rotational movement of the detection shaft 14. During detection, the detection shaft 14 can be driven to rotate one week to detect the circumferential weld 4 of the tube-to-tube sheet around the tube.

[0029] The auxiliary positioning device 40 of this embodiment is installed on the height adjustment seat 26. Specifically, the auxiliary positioning device 40 includes an auxiliary mounting seat 41 connected to the height adjustment seat 26. At least one auxiliary positioning unit 42 for positioning and cooperating with other pipes 3 adjacent to the pipe 2 to be measured is provided on the auxiliary mounting seat 41. As Figure 6 shown in the figure, in this embodiment, the auxiliary positioning unit 42 is provided with two. The two auxiliary positioning units 42 are respectively in positioning cooperation with the two pipes 3. Coupled with the centering cooperation relationship between the centering and sealing device 30 and the pipe 2 to be measured, the detection device of this embodiment can achieve positioning cooperation with three pipes at the same time, improving the stability during the detection process. Of course, in some other embodiments, the auxiliary positioning unit 42 can also be provided with only one, or can be provided with 3 or more, which will not be elaborated here.

[0030] As Figure 7 shown in the figure, in this embodiment, the auxiliary positioning unit 42 includes an expansion positioning component and an expansion adjustment component. The expansion positioning component includes a fixed cone seat 43 in limiting cooperation with the auxiliary mounting seat 41, a movable cone seat 44 that can move axially relative to the fixed cone seat 43, and an expansion sleeve 45 located between the fixed cone seat 43 and the movable cone seat 44. In this embodiment, first conical surfaces 431 and second conical surfaces 441 for cooperating with the expansion sleeve 45 are respectively provided on the outer walls of the fixed cone seat 43 and the movable cone seat 44. The outer diameter of the first conical surface 431 gradually increases along the front-to-back direction, and the outer diameter of the second conical surface 441 gradually decreases along the front-to-back direction.

[0031] The expansion sleeve 45 of this embodiment is divided into at least three segments along the generatrix direction, and at least one installation groove 451 that surrounds one week is provided at intervals on the outer wall of the expansion sleeve 45. A elastic ring 46 is sleeved in the installation groove 451. The elastic ring 46 exerts a radially inward elastic force on the expansion sleeve 45, causing the expansion sleeve 45 to contract. The expansion sleeve 45 of this embodiment is divided into three segments along the generatrix direction. Of course, in some other embodiments, the expansion sleeve 45 can also be provided with 4 segments or more than 4 segments, which will not be elaborated here. Third conical surfaces 452 and fourth conical surfaces 453 that cooperate with the first conical surface 431 and the second conical surface 441 are respectively provided at both ends of the expansion sleeve 45 of this embodiment.

[0032] The expansion adjustment assembly of this embodiment is used to adjust the moving position of the movable cone seat 44 axially relative to the fixed cone seat 43 to control the expansion outer diameter of the expansion sleeve 45. Specifically, the expansion adjustment assembly of this embodiment includes an adjustment screw rod 47. The front end of the adjustment screw rod 47 extends through the fixed cone seat 43 and is in threaded cooperation with the movable cone seat 44. The rear end of the adjustment screw rod 47 extends through the auxiliary mounting seat 41 and is provided with an adjustment handle 48. A screw rod seat 49 that is rotationally matched with the adjustment screw rod 47 is provided on the auxiliary mounting seat 41. A rotating bearing 50 is provided between the fixed cone seat 43 and the adjustment screw rod 47. In this embodiment, the adjustment screw rod 47 includes a threaded section 471 at the front end and a smooth shaft section 472 at the rear end. The adjustment screw rod 47 is in threaded cooperation with the movable cone seat 44 through the threaded section 471, and the adjustment screw rod 47 is rotationally matched with the screw rod seat 49 through the smooth shaft section 472.

[0033] During operation, the adjustment handle 48 can be rotated reversely to move the movable cone seat 44 axially relative to the fixed cone seat 43 and increase the distance between the first conical surface 431 and the second conical surface 441. The expansion sleeve 45 contracts under the action of the elastic ring 46 to reduce the outer diameter. In this way, the expansion positioning assembly can be smoothly inserted into the pipeline 3. After the expansion positioning assembly is inserted into the pipeline 3, the adjustment handle 48 is rotated forward to move the movable cone seat 44 axially relative to the fixed cone seat 43 and reduce the distance between the first conical surface 431 and the second conical surface 441. The expansion sleeve 45 overcomes the elastic force of the elastic ring 46 under the pressure exerted on it by the first conical surface 431 and the second conical surface 441 and increases the outer diameter until the expansion sleeve 45 is clamped with the pipeline 3.

[0034] As Figure 8As shown, during use, the centering and sealing device 30 is inserted into the pipeline 2 to be measured, so that the centering and sealing device 30 is in centering and sealing fit with the pipeline 2 to be measured; the expansion adjustment components of the two auxiliary positioning units 42 are respectively inserted into the two pipelines 3, and the expansion adjustment components are clamped with the corresponding pipelines 3, so as to achieve the technical purpose of positioning and fixing the detection device; after the detection device is positioned and fixed, coupling liquid is injected into the liquid storage area formed between the limit sleeve 262 and the centering and sealing device 30, so that non-contact coupling is achieved between the detection probe and the pipeline 2 to be measured through the coupling liquid; finally, the rotation speed of the motor 18 is adjusted through the speed control knob 21, the rotation direction of the motor 18 is controlled through the forward rotation button 22 and the reverse rotation button 23, and the hollow shaft 12 is driven by the motor 18 to rotate one week, so that the detection probe rotates one week to scan the tube-to-tube sheet weld 4 in a circle. During the scanning process, the scanning position is recorded by the encoder.

[0035] In this way, for the handheld ultrasonic phased array automatic detection device for tube-to-tube sheet welds in this embodiment, by arranging the hollow shaft 12 in the support seat 11 and installing the detection shaft 14 on the hollow shaft 12, the detection shaft 14 can be used to extend into the corresponding pipeline 2 to be measured to detect the tube-to-tube sheet weld 4, and the problem that it is difficult to detect the tube-to-tube sheet weld 4 due to the small size of the pipeline 2 to be measured can be solved; by arranging the height adjustment seat 26 on the support seat 11 and arranging the limit sleeve 262 sleeved outside the detection shaft 14 on the height adjustment seat 26, and using the sealing gasket 263 arranged on the front end face of the limit sleeve 262, the technical purpose of sealing fit with the tube sheet 1 can be achieved; by arranging the connection head 141 at the front end of the detection shaft 14 and installing the centering and sealing device 30 on the connection head 141, the centering and sealing device 30 is in sealing and centering fit with the pipeline 2 to be measured. On the one hand, the detection shaft 14 can be located at the center of the pipeline 2 to be measured, and on the other hand, a liquid storage area for storing coupling liquid can be formed between the limit sleeve 262 and the centering and sealing device 30. In this way, the detection probe can be made not to contact the inner wall of the pipeline 2 to be measured, and the problem of poor coupling caused by the poor surface condition of the inner wall of the pipeline 2 to be measured is solved; during the detection process, by driving the hollow shaft 12 to rotate one week through the rotation driving mechanism, the tube-to-tube sheet weld 4 can be detected in a circle, and no manual operation is required, which can reduce the difficulty of manual operation; in summary, the handheld ultrasonic phased array automatic detection device for tube-to-tube sheet welds of the present invention can solve the problem that it is difficult to detect the tube-to-tube sheet weld 4 due to the small size of the pipeline 2 to be measured, and can effectively improve the detection accuracy and detection efficiency, and reduce the difficulty of manual operation.

[0036] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A handheld ultrasonic phased array automatic inspection device for tube-to-tubesheet welds, characterized in that: The scanning body includes a support seat, a hollow shaft rotatably matched with the support seat and a rotation driving mechanism for driving the hollow shaft to rotate are arranged in the support seat; a connecting seat is installed at the front end of the hollow shaft, and a detection shaft is installed on the connecting seat; The support seat is sleeved with a height adjustment seat, the height adjustment seat comprises a connection portion for connecting with the support seat and a limit sleeve sleeved outside the detection shaft, and a sealing gasket for sealing with the tube sheet is provided on the front end surface of the limit sleeve; A connector is provided at the front end of the detection shaft, and a centering sealing device is installed on the connector to rotate with the connector. The centering sealing device is used for sealing and centering with the pipeline to be tested. A liquid storage area for storing coupling liquid is formed between the limit sleeve and the centering sealing device. The detection shaft is provided with a detection probe located between the limit sleeve and the centering sealing device.

2. The ultrasonic phased array automatic inspection device for the weld seam between a hand-held pipe and a tube sheet according to claim 1, wherein: The rotation driving mechanism comprises a fixedly mounted motor, and the motor is transmission-connected to the hollow shaft via a gear transmission mechanism.

3. The ultrasonic phased array automatic inspection device for the weld seam between the pipe and the tube sheet of a handheld pipe according to claim 2, characterized in that: It also includes a motor control circuit, to which a speed regulating knob for controlling the motor speed and a forward button and a reverse button for controlling the direction of rotation of the motor are connected.

4. The ultrasonic phased array automatic inspection device for the weld seam between the pipe and the tube sheet of the handheld type according to claim 1, wherein: An encoder for detecting the rotation position of the hollow shaft is arranged in the support seat.

5. The ultrasonic phased array automatic inspection device for the weld seam between a hand-held pipe and a tube sheet according to claim 1, wherein: The connecting portion is configured as a clamp, and the clamp is sleeved outside the supporting seat; a connecting arm is provided on the clamp, and the limiting sleeve is arranged at the front end of the connecting arm.

6. The ultrasonic phased array automatic inspection device for the weld between the pipe and the tube sheet of the handheld type according to claim 1, wherein: The centering sealing device includes a centering body for centering with the pipeline to be tested and a sealing seat for sealing with the pipeline to be tested; at least three mounting seats arranged in the axial direction are evenly distributed on the outer peripheral wall of the centering body, and a centering wheel that rotates with it is installed on the mounting seat; at least one annular groove is provided on the outer wall of the sealing seat, and a sealing ring is provided in the annular groove.

7. The ultrasonic phased array automatic inspection device for the weld seam between the pipe and the tube sheet of a handheld pipe according to claim 6, wherein: The sealing seat is located at the rear end of the centering body, and a central through hole for cooperating with the connecting head is provided in the sealing seat. A bearing located between the connecting head and the sealing seat is provided in the central through hole. The rear end of the bearing is limitedly cooperated with the sealing seat, and a transition body for axially limiting the bearing is installed at the front end of the sealing seat, and the transition body is located between the sealing seat and the centering body.

8. The ultrasonic phased array automatic inspection device for the weld seam between the hand-held pipe and the tube sheet according to claim 1, characterized in that: The height adjustment seat is also equipped with an auxiliary positioning device, which includes an auxiliary mounting seat connected to the height adjustment seat, and the auxiliary mounting seat is provided with at least one auxiliary positioning unit for positioning and cooperating with other pipelines adjacent to the pipeline to be tested.

9. The ultrasonic phased array automatic inspection device for hand-held tube-to-tube sheet welds according to claim 8, characterized in that: The auxiliary positioning unit includes an expansion positioning component and an expansion adjustment component; the expansion positioning component includes a fixed cone seat that is in limit fit with the auxiliary mounting seat, a movable cone seat that can move axially relative to the fixed cone seat, and an expansion sleeve located between the fixed cone seat and the movable cone seat; first and second conical surfaces that are respectively matched with the expansion sleeve are provided on the outer walls of the fixed cone seat and the movable cone seat, the outer diameter of the first conical surface gradually increases along the front-to-rear direction, and the outer diameter of the second conical surface gradually decreases along the front-to-rear direction; the expansion sleeve is divided into at least three petals along the generatrix direction, and at least one circumferential installation groove is provided at intervals on the outer wall of the expansion sleeve, and an elastic ring is sleeved in the installation groove; the expansion adjustment component is used to adjust the axial movement position of the movable cone seat relative to the fixed cone seat to control the expansion outer diameter of the expansion sleeve.

10. The ultrasonic phased array automatic inspection device for the weld seam between the pipe and the tube sheet of the handheld type according to claim 9, wherein: The expansion adjustment component includes an adjustment screw rod, the front end of the adjustment screw rod extends through the fixed cone seat and is in threaded fit with the movable cone seat, the rear end of the adjustment screw rod extends through the auxiliary mounting seat and is provided with an adjustment handle, a screw rod seat that is rotationally matched with the adjustment screw rod is provided on the auxiliary mounting seat, and a rotary bearing is provided between the fixed cone seat and the adjustment screw rod.

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