Handheld ultrasonic phased array automatic detection device for tube and tube sheet welds

Abstract

The present invention discloses a handheld ultrasonic phased array automatic detection device for pipe and tube sheet welds, comprising a scanning body, the scanning body comprising a support seat, a hollow shaft rotatably matched with the support seat 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; a height adjustment seat is sleeved on the support seat, the height adjustment seat comprises a connecting portion for connecting with the support seat and a limiting sleeve sleeved outside the detection shaft, a sealing gasket for sealing with the tube sheet is provided on the front end surface of the limiting sleeve; a connecting head is provided at the front end of the detection shaft, a centering sealing device rotatably matched with the support seat is installed on the connecting head, 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 limiting sleeve and the centering sealing device, and a detection probe is provided on the detection shaft and located between the limiting sleeve and the centering sealing device.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and specifically relates to a handheld ultrasonic phased array automatic detection device for tube and tube sheet welds. Background Art

[0002] The tube-to-tube fillet joints in shell-and-tube heat exchangers, reactors, air coolers, waste heat boilers, quenchers, and other equipment (hereinafter collectively referred to as "heat exchangers") are prone to defects such as porosity, lack of fusion, and cracks during manufacturing. Statistics show that the leakage rate of uninspected heat exchanger tube-to-tube sheets can be as high as 15-18%, but after inspection, this rate can be reduced to 1.5-4%. Porosity is the primary cause of corrosion-related leaks.

[0003] During operation, heat exchangers' tubes and tubesheets are subjected to high and low temperature differentials, high pressure differentials, and alternating loads. Equipment like waste heat boilers and quenchers often experience these conditions, often with high temperature differentials (greater than 300°C), high pressure differentials, or cyclic loads. Weld defects can easily develop into through-hole cracks under these conditions. Some heat exchangers, such as petrochemical reactors, handle hazardous media, potentially involving highly toxic, flammable, or corrosive media. Leaks can cause explosions, environmental pollution, or even poisoning. Therefore, tube and tubesheet weld inspection is essential to improve safety.

[0004] However, the heat exchanger tubes typically have an inner diameter of 15-74mm and a thickness of 2-8mm. Conventional ultrasonic probes and wedges make it difficult to penetrate the tubes for inspection. Furthermore, due to the poor surface conditions of the tube interior, contact-based methods can result in poor coupling. Furthermore, the large number of heat exchange tubes necessitates improved inspection efficiency while also reducing manual labor and fatigue. Furthermore, there is no mature ultrasonic scanning device that uses phased array technology to inspect 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 detection device for tube-to-tubesheet welds, which can solve the problem of difficult tube-to-tubesheet weld detection caused by the small size of the pipeline to be tested, and can effectively improve the detection accuracy and efficiency, and reduce the difficulty of manual operation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A handheld ultrasonic phased array automatic inspection device for tube and tube sheet welds includes a scanning body, the scanning body including a support base, a hollow shaft rotatably engaged with the support base and a rotation drive mechanism for driving the hollow shaft to rotate; a connecting base is installed at the front end of the hollow shaft, and a detection shaft is installed on the connecting base;

[0008] A height adjustment seat is sleeved on the support seat, and the height adjustment seat includes a connecting portion for connecting with the support seat and a limiting sleeve sleeved outside the detection shaft, and a sealing gasket is provided on the front end surface of the limiting sleeve for sealing with the tube sheet;

[0009] 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 it. The centering sealing device is used to seal and center the pipeline to be tested. A liquid storage area 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.

[0010] Furthermore, the rotation drive mechanism includes a fixedly installed motor, and the motor is connected to the hollow shaft through a gear transmission mechanism.

[0011] 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.

[0012] Furthermore, an encoder for detecting the rotational position of the hollow shaft is provided in the support seat.

[0013] Furthermore, the connecting portion is configured as a clamp, which is sleeved outside the support seat; a connecting arm is provided on the clamp, and the limiting sleeve is provided at the front end of the connecting arm.

[0014] Furthermore, the centering sealing device includes a centering body for centering 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.

[0015] 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. A bearing located between the connecting head and the sealing seat is provided in the central through hole, and the rear end of the bearing is limitedly engaged with the sealing seat. 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.

[0016] 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 pipes adjacent to the pipe to be tested.

[0017] Furthermore, the auxiliary positioning unit includes an expansion positioning assembly and an expansion adjustment assembly; the expansion positioning assembly includes a fixed conical seat that is limitedly matched with the auxiliary mounting seat, a movable conical seat that can move axially relative to the fixed conical seat, and an expansion sleeve located between the fixed conical seat and the movable conical seat; the outer walls of the fixed conical seat and the movable conical seat are respectively provided with a first conical surface and a second conical surface that cooperate with the expansion sleeve, the outer diameter of the first conical surface gradually increases along the direction from front to back, and the outer diameter of the second conical surface gradually decreases along the direction from front to back; the expansion sleeve is divided into at least three petals along the busbar direction, and at least one mounting groove that surrounds the periphery is provided on the outer wall of the expansion sleeve, and an elastic ring is provided in the mounting groove; the expansion adjustment assembly is used to adjust the axial moving position of the movable conical seat relative to the fixed conical seat to control the expanded outer diameter of the expansion sleeve.

[0018] Furthermore, the expansion adjustment assembly includes an adjusting screw, the front end of which extends through the fixed conical seat and engages with the movable conical seat thread, the rear end of which extends through the auxiliary mounting seat and is provided with an adjustment handle, the auxiliary mounting seat is provided with a screw seat that rotatably engages with the adjusting screw, and a rotating bearing is provided between the fixed conical seat and the adjusting screw.

[0019] The beneficial effects of the present invention are:

[0020] The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds of the present invention provides a hollow shaft in a support seat and installs a detection shaft on the hollow shaft. In this way, the detection shaft can be used to extend into the corresponding pipe to be tested to detect the tube and tube sheet welds, which can solve the problem that the tube and tube sheet welds are difficult to detect due to the small size of the pipe to be tested; a height adjustment seat is provided on the support seat, and a limit sleeve is provided on the height adjustment seat and is sleeved outside the detection shaft. A sealing gasket is provided on the front end surface of the limit sleeve, which can achieve the technical purpose of sealing with the tube sheet; a connector is provided on the front end of the detection shaft, and a centering sealing device is installed on the connector. The sealing and centering cooperation between the centering sealing device and the pipe to be tested can be achieved on the one hand. This allows the detection axis to be located at the center of the pipeline to be tested. On the other hand, a liquid storage area for storing coupling liquid can be formed between the limit sleeve and the centering sealing device. In this way, the detection probe can be prevented from contacting the inner wall of the pipeline to be tested, thereby solving the problem of poor coupling caused by the poor surface condition of the inner wall of the pipeline to be tested. During the detection process, the hollow shaft is driven to rotate one circle by the rotation drive mechanism, so that the pipe-to-tube sheet weld can be detected around the entire circle. No manual operation is required, which can reduce the difficulty of manual operation. In summary, the handheld ultrasonic phased array automatic detection device for pipe-to-tube sheet welds of the present invention can solve the problem of difficult detection of pipe-to-tube sheet welds caused by the small size of the pipeline to be tested, and can effectively improve the detection accuracy and efficiency, and reduce the difficulty of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0022] Figure 1 This is a schematic structural diagram of a handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to the present invention;

[0023] Figure 2 It is a structural diagram of the scanning subject;

[0024] Figure 3 A stereoscopic image of the scanned subject;

[0025] Figure 4 It is a three-dimensional diagram of the centering sealing device;

[0026] Figure 5 It is a partial cross-sectional view of the centering sealing device;

[0027] Figure 6 A three-dimensional diagram of the auxiliary positioning device;

[0028] Figure 7 It is a partial cross-sectional view of the auxiliary positioning device;

[0029] Figure 8 This is a reference diagram of the use status of the handheld ultrasonic phased array automatic detection device for tube and tube sheet welds in this embodiment.

[0030] Description of reference numerals:

[0031] 1-tube sheet; 2-pipeline to be tested; 3-pipeline; 4-tube-tube sheet weld;

[0032] 10- Scanning body; 11- Support base; 12- Hollow shaft; 13- Connecting base; 14- Detection shaft; 141- Connector; 15- Bearing; 16- Bearing; 17- Motor base; 18- Motor; 19- Driving gear; 20- Driven gear; 21- Speed ​​control knob; 22- Forward button; 23- Reverse button; 24- Charging connector; 25- Encoder connector; 26- Height adjustment base; 261- Connecting part; 262- Limit sleeve; 263- Sealing gasket; 264- Connecting arm; 27- Rear cover;

[0033] 30 - Centering seal device; 31 - Centering body; 32 - Sealing seat; 321 - Center through hole; 322 - Bearing; 33 - Transition body; 34 - Mounting seat; 35 - Centering wheel; 36 - Sealing ring;

[0034] 40-Auxiliary positioning device; 41-Auxiliary mounting seat; 42-Auxiliary positioning unit; 43-Fixed conical seat; 431-First conical surface; 44-Movable conical 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-Optical axis section; 48-Adjusting handle; 49-Screw seat; 50-Rotating bearing. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0036] like Figure 1 As shown, the handheld ultrasonic phased array automatic inspection device for tube-to-tubesheet 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 with the pipe 2 under test. The auxiliary positioning device 40 assists in positioning the ultrasonic probe and is used to position the probe with other pipes 3 adjacent to the pipe 2 under test.

[0037] like Figure 2-3 As shown, the scanning body 10 of this embodiment includes a support base 11. A hollow shaft 12 is mounted within the support base 11, which rotates with the support base 11 and a rotation drive mechanism for driving the hollow shaft 12. A connecting base 13 is mounted at the front end of the hollow shaft 12, and a detection shaft 14 is mounted on the connecting base 13. In this embodiment, bearings 15 and 16 are provided between the support base 11 and the hollow shaft 12. A detection probe is mounted on the detection shaft 14, and the connection cable of the detection probe is led out through the hollow shaft 12.

[0038] In this embodiment, a motor base 17 is mounted on the support base 11. The rotation drive mechanism includes a motor 18 fixedly mounted within the motor base 17. The motor 18 is connected to the hollow shaft 12 via a gear transmission mechanism. Specifically, in this embodiment, a driving gear 19 is mounted on the output shaft of the motor 18, and a driven gear 20 is mounted on the hollow shaft 12 to rotate synchronously with the motor 18. The driving gear 19 and the driven gear 20 are meshed with each other.

[0039] In a preferred embodiment of this embodiment, the rotation drive mechanism of this embodiment further includes a motor control circuit, to which is connected a speed control 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. Specifically, a rear cover 27 is mounted on the motor base 17 of this embodiment, the speed control knob 21 is disposed on the rear end surface of the rear cover 27, and the forward button 22 and the reverse button 23 are disposed on the side surfaces of the motor base 17. A battery for powering the motor 18 is disposed within the rear cover 27 of this embodiment, and a charging connector 24 for charging the battery is disposed on the rear cover 27. In this manner, during the detection process, the speed of the motor 18 can be adjusted using the speed control knob 21, and the direction of the motor 18 can be adjusted using the forward button 22 and the reverse button 23.

[0040] In a preferred embodiment of this embodiment, an encoder for detecting the rotational position of the hollow shaft 12 is provided within the support base 11, and the encoder is in contact with the hollow shaft 12. An encoder connector 25 connected to the encoder is provided on the rear cover 27 of this embodiment. By providing the encoder, the position information of the scanned data can be accurately recorded.

[0041] In this embodiment, a height adjustment base 26 is mounted on the support base 11. The height adjustment base 26 comprises a connecting portion 261 for connection to the support base 11 and a limiting sleeve 262 that fits over the detection shaft 14. The front end surface of the limiting sleeve 262 is provided with a sealing gasket 263 for sealing against the tube sheet 1. In this embodiment, the connecting portion 261 is configured as a clamp that fits over the support base 11. The clamp is provided with a connecting arm 264, and the limiting sleeve 262 is disposed at the front end of the connecting arm 264.

[0042] In this embodiment, a connector 141 is provided at the front end of the detection shaft 14, and the centering seal 30 is rotatably mounted on the connector 141. The centering seal 30 of this embodiment is used to seal and center the pipe 2 under test. A reservoir for the coupling fluid is formed between the stop sleeve 262 and the centering seal 30. A detection probe is provided on the detection shaft 14, positioned between the stop sleeve 262 and the centering seal 30. The centering seal 30 of this embodiment is detachably mounted on the connector 141, allowing for replacement of the appropriate centering seal 30 as the inner diameter of the pipe 2 under test changes.

[0043] In this way, after the centering sealing device 30 is inserted into the pipe 2 to be tested, the centering matching relationship between the centering sealing device 30 and the pipe 2 to be tested can be utilized to position the detection shaft 14 in the middle of the pipe 2 to be tested; utilizing the sealing matching relationship between the centering sealing device 30 and the pipe 2 to be tested and the sealing matching 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 pipe 2 to be tested through the coupling liquid, which can solve the problem of poor coupling caused by the poor surface condition of the inner wall of the pipe 2 to be tested.

[0044] like Figure 4 As shown, in this embodiment, the centering sealing device 30 includes a centering body 31 for centering with the pipe to be measured 2 and a sealing seat 32 for sealing with the pipe to be measured 2. Specifically, at least three mounting seats 34 arranged in the axial direction are evenly distributed in an annular manner on the outer peripheral wall of the centering body 31, and a centering wheel 35 that rotates with it is installed on the mounting seat 34. The centering wheel 35 evenly distributed in an annular manner can reduce the resistance of the centering body 31 when inserted into the pipe to be measured 2 and achieve centering. At least one annular groove is provided on the outer wall of the sealing seat 32 of this embodiment, and a sealing ring 36 is provided in the annular groove. The sealing ring 36 can make the sealing seat 32 and the pipe to be measured 2 sealed. Specifically, as Figure 5 As shown, the sealing seat 32 of this embodiment is located at the rear end of the centering body 31. A central through hole 321 is provided in the sealing seat 32 for mating with the connector 141. A bearing 322 is provided in the central through hole 321, located between the connector 141 and the sealing seat 32. The rear end of the bearing 322 is limitedly engaged with the sealing seat 32. A transition body 33 is installed at the front end of the sealing seat 32 for axially limiting the bearing 322. The transition body 33 is located between the sealing seat 32 and the centering body 31. In this way, the connector 141 and the sealing seat 32 can be rotationally engaged, that is, the centering sealing device 30 does not affect the rotation of the detection shaft 14. During testing, the detection shaft 14 can be driven to rotate once to inspect the tube-tubesheet weld 4 around the entire circle.

[0045] 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, and the auxiliary mounting seat 41 is provided with at least one auxiliary positioning unit 42 for positioning and cooperating with other pipes 3 adjacent to the pipe 2 to be tested. Figure 6As shown, in this embodiment, two auxiliary positioning units 42 are provided. The two auxiliary positioning units 42 are respectively positioned and matched with two pipes 3. Combined with the centering and matching relationship between the centering sealing device 30 and the pipe 2 to be tested, the detection device of this embodiment can simultaneously achieve positioning and matching with three pipes, thereby improving stability during the detection process. Of course, in other embodiments, the auxiliary positioning unit 42 can be provided as only one, or as three or more. This will not be repeated here.

[0046] like Figure 7 As shown, in this embodiment, the auxiliary positioning unit 42 includes an expansion positioning assembly and an expansion adjustment assembly. The expansion positioning assembly includes a fixed conical seat 43 that engages with the auxiliary mounting seat 41, a movable conical seat 44 that is movable axially relative to the fixed conical seat 43, and an expansion sleeve 45 positioned between the fixed and movable conical seats 43 and 44. In this embodiment, the outer walls of the fixed and movable conical seats 43 and 44 are respectively provided with a first conical surface 431 and a second conical surface 441 that engage with the expansion sleeve 45. The outer diameter of the first conical surface 431 gradually increases from front to back, while the outer diameter of the second conical surface 441 gradually decreases from front to back.

[0047] The expansion sleeve 45 of this embodiment is divided into at least three petals along the busbar direction. The outer wall of the expansion sleeve 45 is provided with at least one circumferential mounting groove 451, and an elastic ring 46 is positioned within the mounting groove 451. The elastic ring 46 applies a radially inward elastic force to the expansion sleeve 45, causing it to contract. The expansion sleeve 45 of this embodiment is divided into three petals along the busbar direction. Of course, in other embodiments, the expansion sleeve 45 can also have four or more petals, which will not be discussed further. The expansion sleeve 45 of this embodiment is provided at both ends with a third tapered surface 452 and a fourth tapered surface 453, respectively, which mate with the first tapered surface 431 and the second tapered surface 441.

[0048] The expansion adjustment assembly of this embodiment is used to adjust the axial movement position of the movable conical seat 44 relative to the fixed conical seat 43 to control the expanded outer diameter of the expansion sleeve 45. Specifically, the expansion adjustment assembly of this embodiment includes an adjustment screw 47. The front end of the adjustment screw 47 extends through the fixed conical seat 43 and is threadedly engaged with the movable conical seat 44. The rear end of the adjustment screw 47 extends through the auxiliary mounting seat 41 and is provided with an adjustment handle 48. The auxiliary mounting seat 41 is provided with a screw seat 49 that rotationally engages with the adjustment screw 47. A rotating bearing 50 is provided between the fixed conical seat 43 and the adjustment screw 47. In this embodiment, the adjustment screw 47 includes a threaded section 471 at the front end and an optical axis section 472 at the rear end. The adjustment screw 47 is threadedly engaged with the movable conical seat 44 via the threaded section 471, and the adjustment screw 47 is rotationally engaged with the screw seat 49 via the optical axis section 472.

[0049] During operation, the adjusting handle 48 can be rotated in the reverse direction to make the movable conical seat 44 move axially relative to the fixed conical 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 pipe 3; after the expansion positioning assembly is inserted into the pipe 3, the adjusting handle 48 is rotated forward to make the movable conical seat 44 move axially relative to the fixed conical 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 and increases the outer diameter under the pressure exerted on it by the first conical surface 431 and the second conical surface 441 until the expansion sleeve 45 is clamped between the pipe 3.

[0050] like Figure 8 As shown, when in use, the centering sealing device 30 is inserted into the pipe to be tested 2, so that the centering sealing device 30 and the pipe to be tested 2 are centered and sealed; the expansion adjustment components of the two auxiliary positioning units 42 are respectively inserted into the two pipes 3, and the expansion adjustment components are clamped with the corresponding pipes 3 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 sealing device 30, so that the detection probe and the pipe to be tested 2 are non-contact coupled through the coupling liquid; finally, the speed of the motor 18 is adjusted by the speed control knob 21, and the direction of the motor 18 is controlled by the forward button 22 and the reverse button 23. The motor 18 drives the hollow shaft 12 to rotate one circle, so that the detection probe rotates one circle to scan the pipe-tube sheet weld 4 around the pipe. During the scanning process, the encoder is used to record the scanning position.

[0051] In this way, the handheld tube-tube-sheet weld ultrasonic phased array automatic detection device of this embodiment, by arranging a hollow shaft 12 in the support seat 11 and installing a detection shaft 14 on the hollow shaft 12, can use the detection shaft 14 to extend into the corresponding pipe 2 to be tested to detect the tube-tube-sheet weld 4, which can solve the problem that the tube-tube-sheet weld 4 is difficult to detect due to the small size of the pipe 2 to be tested; by arranging a height adjustment seat 26 on the support seat 11, and arranging a limit sleeve 262 on the height adjustment seat 26 to be sleeved on the outside of the detection shaft 14, the technical purpose of sealing with the tube sheet 1 can be achieved by using a sealing gasket 263 provided on the front end surface of the limit sleeve 262; by arranging a connector 141 at the front end of the detection shaft 14, and installing a centering sealing device 30 on the connector 141, the centering sealing device 30 is in contact with the pipe to be tested 2, on the one hand, the detection shaft 14 can be located at the center of the pipeline 2 to be tested, and on the other hand, a liquid storage area for storing the coupling liquid can be formed between the limit sleeve 262 and the centering sealing device 30. In this way, the detection probe will not contact the inner wall of the pipeline 2 to be tested, solving the problem of poor coupling caused by the poor surface condition of the inner wall of the pipeline 2 to be tested; during the detection process, the hollow shaft 12 is driven to rotate one circle by the rotation drive mechanism, so that the tube-to-tube sheet weld 4 can be detected around the whole circle, without the need for manual operation, which can reduce the difficulty of manual operation; in summary, the handheld tube-to-tube sheet weld ultrasonic phased array automatic detection device of the present invention can solve the problem that the tube-to-tube sheet weld 4 is difficult to detect due to the small size of the pipeline 2 to be tested, and can effectively improve the detection accuracy and detection efficiency, and reduce the difficulty of manual operation.

[0052] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A handheld ultrasonic phased array automatic detection device for tube and tube sheet welds, characterized by: The scanning body includes a support base, a hollow shaft rotatably matched with the support base and a rotation drive mechanism for driving the hollow shaft to rotate are provided in the support base; a connecting base is installed at the front end of the hollow shaft, and a detection shaft is installed on the connecting base; The support seat is provided with a height adjustment seat, which includes a connecting portion for connecting to the support seat and a limiting 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 limiting sleeve; the height adjustment seat is also provided 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; The front end of the detection shaft is provided with a connector, and a centering sealing device is installed on the connector to rotate with the connector. The centering sealing device is used to seal and center the pipeline to be tested. A liquid storage area 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; The centering sealing device includes a centering body for centering 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 is installed on the mounting seat to rotate with it; 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; 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 the rear end of the bearing is limitedly engaged with the sealing seat, and the front end of the sealing seat is provided with a transition body for axially limiting the bearing, and the transition body is located between the sealing seat and the centering body.

2. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 1 is characterized in that: The rotation drive mechanism includes a fixedly installed motor, and the motor is connected to the hollow shaft through a gear transmission mechanism.

3. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 2 is characterized in that: The motor control circuit is further comprised of a speed regulating knob for controlling the motor speed and a forward button and a reverse button for controlling the motor rotation direction.

4. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 1 is characterized in that: An encoder for detecting the rotation position of the hollow shaft is provided in the support seat.

5. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 1 is characterized in that: 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 provided at the front end of the connecting arm.

6. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 1 is characterized in that: The auxiliary positioning unit includes an expansion positioning assembly and an expansion adjustment assembly; the expansion positioning assembly includes a fixed conical seat that is limited by the auxiliary mounting seat, a movable conical seat that moves in the axial direction relative to the fixed conical seat, and an expansion sleeve located between the fixed conical seat and the movable conical seat; the outer walls of the fixed conical seat and the movable conical seat are respectively provided with a first conical surface and a second conical surface that cooperate with the expansion sleeve, the outer diameter of the first conical surface gradually increases along the direction from front to back, and the outer diameter of the second conical surface gradually decreases along the direction from front to back; the expansion sleeve is divided into at least three petals along the busbar direction, and at least one mounting groove that circumscribes the expansion sleeve is provided on the outer wall of the expansion sleeve, and an elastic ring is provided in the mounting groove; the expansion adjustment assembly is used to adjust the axial moving position of the movable conical seat relative to the fixed conical seat to control the expanded outer diameter of the expansion sleeve.

7. The handheld ultrasonic phased array automatic detection device for tube and tube sheet welds according to claim 6 is characterized in that: The expansion adjustment assembly includes an adjusting screw, the front end of which extends through the fixed conical seat and engages with the movable conical seat thread, the rear end of which extends through the auxiliary mounting seat and is provided with an adjusting handle, the auxiliary mounting seat is provided with a screw seat that rotatably engages with the adjusting screw, and a rotating bearing is provided between the fixed conical seat and the adjusting screw.

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