Detection device and detection method for circumferential weld of plastic liner

Abstract

The invention discloses a detection device and a detection method for a circumferential weld of a plastic liner, and the device is provided with a water tank, an operation table, a rotation driving mechanism, a double-top centering clamping walking mechanism which comprises a driving end and a driven end, and two sets of detection trolleys based on a main body pedestal. The detection trolleys are arranged in the water tank in a sinking mode, the top of each detection trolley is provided with a positioning roller and a phased array ultrasonic probe which are adjustable in distance, a workpiece to be detected falls on the positioning rollers and is locally immersed in water, and the phased array probes, the double-top type centering clamping walking mechanism and the operation table are in signal interconnection with an industrial personal computer arranged in the main body base. And full-automatic phased array ultrasonic detection is performed on the double-ring welding seam in the clamped and driven-to-rotate workpiece to be detected. The cost of using a real wedge block and tedious manufacturing are omitted, the height and width of a water layer are used as the angle of the sound wave emission wedge block in the detection process, and practical operation is flexible and convenient; the detection effect stability is improved; and the detection efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to a quality inspection device for pressure vessels produced by industrial production lines, and particularly to an online automatic phased array ultrasonic testing device and method for circumferential welds obtained by laser, infrared, etc. in plastic liners. Background Art

[0002] With the continuous improvement of the requirements for inspection efficiency and inspection reliability in industrial production, especially the increasing emphasis on product quality and public safety in the market, new non-destructive testing technologies (phased array ultrasonic testing technology) have become increasingly mature in the fields of metal products, plastic products, parts and welded joints. The main implementation methods of inspection equipment during the inspection process are mainly manual and semi-automatic inspections with scanning devices and position encoders; however, welding quality inspections in the field of circumferential welded joints of plastic gas cylinder liners are relatively rare, especially online fully automatic phased array ultrasonic testing is almost non-existent currently.

[0003] Currently, the implementation methods of phased array ultrasonic testing technology are mostly handheld testing technology and semi-automatic testing technology. Usually, a gas cylinder liner has two circumferential welds. When the distance between the two circumferential welds of workpieces of the same model and specification and the surface states on both sides of the welds differ greatly, the false alarm rate during the inspection process will increase. Summary of the Invention

[0004] The purpose of the present invention is to propose a testing device and method for circumferential welds of plastic liners to achieve online automatic phased array ultrasonic quality inspection of single circumferential welds or double circumferential welds of plastic liners of different specifications simultaneously.

[0005] A technical solution for the present invention to achieve the above purpose is a testing device for circumferential welds of plastic liners. Based on a main body base, there are a water tank, an operating table, a rotary drive mechanism, a double-top centering and clamping walking mechanism including a driving end and a driven end, and two sets of testing trolleys. The driving end and the driven end are mounted on the guide rails at the top of the water tank and are driven to separate or approach and clamp for positioning the workpiece to be inspected. The rotary drive mechanism is installed at the driving end and drives the workpiece to be inspected to rotate. The two sets of testing trolleys are submerged in the water tank, and each set of testing trolleys is provided with position rollers with adjustable spacing and phased array ultrasonic probes at the top. In the no-load initial state, the position rollers protrude above the water surface, and in the state where the workpiece to be inspected is in place, the position rollers and the workpiece to be inspected are partially immersed in water. The phased array probes, the double-top centering and clamping walking mechanism, and the operating table are respectively interconnected with the industrial computer built in the main body base through signals.

[0006] The above-mentioned detection device for the circumferential weld of the plastic inner liner. Further, the water tank is composed of an external frame, a skin, and an internal cavity. And a water level monitoring and abnormal alarm, as well as a water injection faucet, an overflow port, and a drain port arranged vertically and horizontally, are provided inside the water tank. The external frame is integrally connected to the main body base; a linear rack is provided beside the guide rail. The active end is integrated with a first servo motor and a first transmission gear, and the driven end is integrated with a second servo motor and a second transmission gear. Both transmission gears are engaged with the linear rack, and the control ends of the two servo motors are signal-connected to the industrial computer of the operation console; the active end is integrated with a first lifter, and the driven end is integrated with a second lifter. The driving ends of the two lifters are signal-connected to the industrial computer of the operation console; each set of detection trolleys is provided with a frame bottom plate, a probe clamping and adjusting mechanism, positioning rollers, a phased array ultrasonic probe, a probe mounting seat, guide columns, and support springs. The frame bottom plate is equipped with traveling rollers for translation in the water tank. A plurality of guide columns are vertically connected to the four corners of the frame bottom plate and each is sleeved with a support spring; the probe clamping and adjusting mechanism is sleeved on all the guide columns and support springs and keeps the whole in a horizontally floating state. The positioning rollers and the probe mounting seat are respectively connected to the top of the probe clamping and adjusting mechanism; the probe clamping and adjusting mechanism is provided with a first adjusting tooling and a second adjusting tooling. And the first adjusting tooling adjusts the distance between the positioning rollers through screw drive, and the second adjusting tooling adjusts the distance between the probe mounting seat and the phased array ultrasonic probe mounted thereon through screw drive.

[0007] Another technical solution for the present invention to achieve the above object is a method for detecting the circumferential weld of a plastic inner liner, which is implemented based on the operation of the detection device described in claim 8, and is characterized by including the steps: S1, load the workpiece to be inspected on the positioning rollers of the detection trolley for temporary support, adjust the distance between the positioning rollers according to the workpiece specifications using the first adjusting tooling, and adjust the distance between the phased array ultrasonic probes according to the width of the circumferential weld using the second adjusting tooling; S2, use the human-machine interface of the operation console to set the operating parameters of the active end and the driven end, move the active end along the height Z1 axis and the horizontal X1 axis to the pre-clamping position corresponding to the workpiece to be inspected, and move the driven end along the height Z2 axis and the horizontal X2 axis to the clamping position corresponding to the workpiece to be inspected, axially position the workpiece to be inspected and partially immerse its bottom side in water; S3, start the rotation drive mechanism to make the workpiece to be inspected rotate 360° along the R axis, calibrate the perimeter encoder for detecting the circumferential weld of the workpiece to be inspected, and pause the drive of the rotation of the workpiece to be inspected after calibration is completed. The calibration accuracy is within ±1°; S4, start the phased array ultrasonic detection software preset in the industrial computer, and perform modeling of the detection model according to the welding parameters of the circumferential weld; S5. Rotate the workpiece to be inspected again, and use the height and width of the water layer between the outer wall of the workpiece to be inspected and the phased array ultrasonic probe to adjust the angle of the acoustic emission wedge block in the inspection process, and simultaneously perform on-line inspection on a pair of circumferential welds. S6. After the inspection is completed, the active end and the driven end are respectively reset, and the workpiece to be inspected is unloaded or replaced from the positioning roller.

[0008] Applying the inspection device of the present invention to perform on-line quality inspection on more than one circumferential weld in a plastic inner liner, the technical effects are as follows: 1). By adopting the local water immersion method combined with the phased array ultrasonic inspection technology of rolling traversal, it avoids the cost and cumbersome process of customizing the physical wedge block in front of the probe under the traditional similar inspection principle. Using the height and width of the water layer to adjust the angle of the acoustic emission wedge block in the inspection process, the operation is flexible and convenient.

[0009] 2). It can achieve continuous on-line inspection without omission of various defects of workpieces to be inspected of the same model, and improve the stability of the inspection effect.

[0010] 3). For workpieces to be inspected with double welds, through simultaneous on-line automatic inspection, the inspection efficiency can be doubled. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the overall assembly structure schematic diagram of the inspection device for the circumferential weld of the plastic inner liner of the present invention.

[0012] Figure 2 is Figure 1 the detailed structure schematic diagram of the inspection trolley in the shown inspection device. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following will further elaborate on the specific implementation manners of the present invention in conjunction with the accompanying drawings of the embodiments, so that the technical solutions of the present invention are easier to understand and master, thereby making the protection scope of the present invention more clearly defined.

[0014] In view of the many deficiencies in the existing inspection technology for circumferential welds of plastic inner liners, the designer of the present invention innovatively proposed an inspection device and inspection method based on phased array ultrasonic waves, adopting the local water immersion method to simultaneously perform quality inspection on single welds or double circumferential welds of plastic gas cylinder inner liners of different specifications, and effectively reducing costs and increasing efficiency.

[0015] As Figure 1 and Figure 2As shown, the detection device of the ring weld of the plastic liner is provided with a water tank box 2, an operating table 3, a rotating drive mechanism 4, a double top centering clamping walking mechanism 5 including an active end 5a and a driven end 5b, and two sets of detection trolleys 6 based on the main body base 1. The active end and the driven end are mounted on the guide rail 25 on the top of the water tank box and driven to separate or close to clamp the workpiece to be inspected 7 for positioning, and the rotating drive mechanism is installed on the active end and drives the workpiece to be inspected to rotate. The two sets of detection trolleys are sunk in the water tank box and each set of detection trolleys is provided with a positioning roller 63 with adjustable spacing and a phased array ultrasonic probe 64 on the top. In the initial state of no load, all the positioning rollers are exposed on the water surface. In the state where the workpiece to be inspected is in place, the workpiece to be inspected is floatingly supported by the positioning rollers and partially immersed in water, while the phased array probe, the double top centering clamping walking mechanism, and the operating table are respectively interconnected with the industrial computer signal built into the main body base, and the displacement, rotation and phased array ultrasonic detection are set according to their respective functions.

[0016] The present invention targets double ring welds and uses two groups of phased array ultrasonic probes, which are respectively installed horizontally on two inspection carts in a water tank box. When the workpiece to be inspected is placed on top of the inspection cart, it sinks into a partial water immersion state. Each group of two probes corresponds to one of the ring welds, and the double ring welds are inspected simultaneously. In addition, water is used as the air-separating medium during the inspection process to avoid the wear of the phased array ultrasonic probe. At the same time, water is used as the wedge of the probe. By adjusting the distance between the workpiece to be inspected and the probe, the distance between the probes, and changing the height of the water layer, different wedge angles can be adjusted as needed, thereby saving the need for different physical wedges required for different models and specifications of gas cylinder liners and different welding widths, thereby improving the inspection efficiency and flexibility.

[0017] From the perspective of further detailed features, the above-mentioned water tank box 2 is composed of an external frame, a skin and an internal cavity, and the external frame is integrally assembled with the main base. Although not marked in detail, it is actually formed into a rectangular open box by stamping and bending stainless steel, and the inner wall is covered with a layer of cortical layer that can effectively prevent water seepage, and then an open cavity with a similar appearance is nested in it (material is not limited). According to the current common specifications of gas cylinder plastic liners in the industry, the length of the water tank box is about 5.5 meters, the width is about 1.5 meters, the maximum depth can reach 0.5 meters, and the water level monitoring and abnormal alarm 21 are provided inside the water tank box, as well as a water filling tap 22, an overflow port 23 and a drain port 24 arranged up and down. The drain port is surrounded by a certain inclination angle to ensure that the water can be drained and no water accumulates when not in use.

[0018] From the operation and drive of the double-top centering and clamping walking mechanism, a linear rack (not shown) is provided beside the above-mentioned guide rail 25, the active end 5a is integrated with a first servo motor and a first transmission gear, and the driven end 5b is integrated with a second servo motor and a second transmission gear. Both transmission gears are meshed with the linear rack, and the control signals of the two servo motors are connected to the industrial computer of the operation console. Under the command signal of the industrial computer, the transmission gears are driven to rotate by the servo motors, and the active end or the driven end is driven to displace along the linear rack respectively. Specifically, as Figure 1 shown, the active end displaces horizontally along the X1 axis, and the driven end displaces horizontally along the X2 axis. The two can be controlled to move closer or separate from each other. At the same time, the active end is integrated with a first lifter and a rotary drive mechanism, and the driven end is integrated with a second lifter. The drive signals of the two lifters are connected to the industrial computer of the operation console. Under the command signal of the industrial computer, they lift and lower synchronously. A chuck corresponding to the bottle mouth of the workpiece to be inspected is integrally installed on the lifter. Then, through the displacement changes of the active end and the driven end on the X1 / X2 and Z1 / Z2 axes, the workpiece to be inspected can be clamped and driven to rotate controllably. For the fixture system on the automated production line to perform the clamping, placing and rotating operations on the workpiece to be inspected are all conventional techniques in the art. Therefore, the details of this part are not the main direction of the protection request of the present invention, so the detailed illustrations and detailed descriptions are omitted.

[0019] As the design core of the detection device of the present invention, two sets of detection trolleys and their attached accessory bodies are located in the water tank, and most of the water tank is submerged in water after being filled with water. As Figure 2Taking one set of inspection trolleys as an example, the structure and functional design are described. This inspection trolley is provided with a frame bottom plate 61, a probe clamping and adjusting mechanism 62, positioning rollers 63, a phased array ultrasonic probe 64, a probe mounting seat 65, guide columns 66 and support springs 67. The frame bottom plate 61 is equipped with traveling rollers 68 for translation in the water tank and an infrared positioner 69 at the center point of the weld between them. Here, the function of this positioner is to be able to identify and determine that each circumferential weld is evenly maintained at the spacing between the two probes. A number of guide columns are vertically installed at the four corners of the frame bottom plate and each is sleeved with a support spring; the probe clamping and adjusting mechanism (shown in the dotted box in the figure) is sleeved on all the guide columns and support springs and remains in an overall horizontally floating state. The positioning rollers and the probe mounting seat are respectively installed at the top of the probe clamping and adjusting mechanism. From the height difference between the top positioning rollers and the probes shown in the figure, it can be seen that after the workpiece to be inspected is placed on the positioning rollers, the overall probe clamping and adjusting mechanism moves downward but is still floatingly supported by the support springs. At this time, the stability of the workpiece to be inspected in the height direction is slightly poor, but there is a non-contact relative interval distance from the probes. When the workpiece to be inspected is clamped by the active end and the driven end and adjusted to the inspection position, the workpiece to be inspected is partially immersed in water. Of course, the phased array ultrasonic probe is also submerged below the water surface. Thus, it can be seen that by adjusting the lifters provided at the active end and the driven end or by filling and draining water in the water tank, the partial immersion depth of the workpiece to be inspected can be changed, and different wedge angles can be conveniently obtained in this way.

[0020] Among them, the positioning rollers are parallel to the loading axis of the workpiece to be inspected, and there are two groups of positioning rollers distributed axially in a set of inspection trolleys shown in the figure. Each group has two positioning rollers arranged at an interval. Therefore, this set of inspection trolleys plays a supporting role at four points on the bottom side of the workpiece to be inspected, and the positioning rollers can rotate along with the rotation of the workpiece to be inspected itself. Since there are differences in the spacing and width of the double-ring welds in the plastic liners of gas cylinders of different specifications, the two sets of inspection trolleys need to be displaced and positioned in the water tank to adapt to the spacing of the double-ring welds. At the same time, the distance between a set of two phased array ultrasonic probes in each inspection trolley also needs to be adjusted to adapt to the width of any one ring weld. Therefore, the probe clamping and adjusting mechanism 62 is provided with a first adjusting tooling 621 and a second adjusting tooling 622. Usually, the circumferential weld of the plastic liner is close to the bottle shoulder, and the two groups of positioning rollers of any set of inspection trolleys need to all act on the bottle body of the plastic liner. Therefore, the distance between the two groups of positioning rollers should be kept outside a set of probes and not be overly enlarged. Therefore, the first adjusting tooling deliberately adjusts the distance between the two groups of positioning rollers axially through the transmission of the lead screw and the nut sleeve. Similarly, the second adjusting tooling also adjusts the distance between the probe mounting seat and the phased array ultrasonic probe installed thereon through the transmission of the lead screw and the positioning nut. Here, since the probe clamping and adjusting mechanism is kept below the water surface during the working process, it is a pure mechanical adjusting tooling, and these two distance adjustments are manually operated according to the actual process requirements, which has parameter stability for batch inspection operations and is convenient for the full automation of subsequent inspection operations. Of course, under the condition that the waterproof conditions are met, these two sets of adjusting toolings can also be assembled by using a linear motor and a rangefinder in combination.

[0021] Understanding the specific implementation of this inspection method from the inspection process includes the following steps: S1, load the workpiece to be inspected onto the positioning rollers of the inspection trolley for temporary support, and adjust the distance between the positioning rollers (the distance between the two groups of positioning rollers in each inspection trolley) using the first adjusting tooling according to the workpiece specifications, and adjust the distance between the phased array ultrasonic probes using the second adjusting tooling according to the width of the circumferential weld. Of course, these adjustments can also be preset before the actual inspection operation.

[0022] S2, set the operating parameters of the active end and the driven end using the human-machine interface of the operating console, move the active end along the height Z1 axis and the horizontal X1 axis to the pre-clamping position corresponding to the workpiece to be inspected, and move the driven end along the height Z2 axis and the horizontal X2 axis to the clamping position corresponding to the workpiece to be inspected, axially position the workpiece to be inspected and partially immerse its bottom side in water.

[0023] S3, start the rotary drive mechanism to make the workpiece to be inspected rotate 360° along the R axis, calibrate the perimeter encoder 51 for inspecting the circumferential weld of the workpiece to be inspected, and pause the drive of the rotation of the workpiece to be inspected after the calibration is completed. The calibration accuracy is within ±1°.

[0024] S4. Start the phased array ultrasonic testing software pre-installed in the industrial control computer, and build a testing model based on the welding parameters of the circumferential weld. In the embodiment of the present invention, the brand model of the phased array ultrasonic probe is 7L32-0.25X10, and the relevant version number of the testing software is: 20150320.

[0025] S5. Drive the workpiece to be inspected to rotate again, and use the height and width of the water layer between the outer wall of the workpiece to be inspected and the phased array ultrasonic probe to adjust the angle of the acoustic emission wedge block in the testing process, and conduct on-line inspection of a pair of circumferential welds at the same time. Specifically, a set of two phased array ultrasonic probes are respectively arranged on both sides of each circumferential weld to achieve the purpose of single-sided and double-sided inspection of the circumferential weld; establish a testing model (testing effect diagram) consistent with the workpiece to be inspected through the testing software, and use the fan-shaped scanning method to conduct internal and external quality inspections on the circumferential weld, and the type, position and size of the defects can be determined.

[0026] S6. After the inspection is completed, the active end and the driven end are respectively reset, and the workpiece to be inspected is removed or replaced from the positioning roller.

[0027] In summary, regarding the introduction and detailed description of the detection device and detection method for the circumferential weld of the plastic inner liner of the present invention, it can be seen that this solution conducts simultaneous on-line quality inspection on more than one circumferential weld in the plastic inner liner, and it has prominent substantive features and remarkable progressiveness. The technical effects obtained are as follows: 1). Adopt the phased array ultrasonic testing technology combining the local water immersion method and rolling traversal, avoiding the cost and cumbersome process of customizing the physical wedge block in front of the probe under the traditional similar testing principle, and using the height and width of the water layer to adjust the angle of the acoustic emission wedge block in the testing process, which is flexible and convenient to operate.

[0028] 2). It can achieve continuous on-line detection of various defects of the same type of workpiece to be inspected without omission, and improve the stability of the detection effect.

[0029] 3). For the workpiece to be inspected with double welds, the detection efficiency can be doubled through simultaneous on-line automated detection.

[0030] In addition to the above embodiments, the present invention can also have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A detection device for the circumferential weld of a plastic inner liner, characterized in that: Based on the main body base, there are a water tank, an operating table, a rotary drive mechanism, a double-top centering and clamping walking mechanism including a driving end and a driven end, and two sets of inspection trolleys. The driving end and the driven end are mounted on the guide rails at the top of the water tank and are driven to separate or approach and clamp the workpiece to be inspected for positioning. The rotary drive mechanism is installed on the driving end and drives the workpiece to be inspected to rotate. The two sets of inspection trolleys are sunk in the water tank, and each set of inspection trolleys is provided with positioning rollers with adjustable spacing and phased array ultrasonic probes at the top. In the no-load initial state, the positioning rollers protrude above the water surface. In the state where the workpiece to be inspected is in place, the positioning rollers and part of the workpiece to be inspected are immersed in water. The phased array probes, the double-top centering and clamping walking mechanism, and the operating table are respectively interconnected with the industrial computer built in the main body base by signals.

2. The detection device for the circumferential weld of the plastic inner liner according to claim 1, characterized in that: The water tank is composed of an external frame, a skin, and an internal cavity. And there are a water level monitoring and abnormal alarm in the water tank, as well as a water injection faucet, an overflow port, and a drain port arranged vertically. The external frame is integrally connected to the main body base.

3. The detection device for the circumferential weld of the plastic inner liner according to claim 1, characterized in that: There is a linear rack beside the guide rail. The driving end is integrated with a first servo motor and a first transmission gear. The driven end is integrated with a second servo motor and a second transmission gear. The two transmission gears are both meshed with the linear rack, and the control ends of the two servo motors are signal-connected to the industrial computer on the operating table.

4. The detection device for the circumferential weld of the plastic inner liner according to claim 1, characterized in that: The driving end is integrated with a first lifter, and the driven end is integrated with a second lifter. The driving ends of the two lifters are signal-connected to the industrial computer on the operating table.

5. The inspection device for the circumferential weld of the plastic inner liner according to claim 1, characterized in that: Each set of inspection trolleys is provided with a frame bottom plate, a probe clamping and adjusting mechanism, positioning rollers, phased array ultrasonic probes, probe mounting seats, guide columns, and support springs. The frame bottom plate is equipped with walking rollers for translation in the water tank. A number of guide columns are vertically installed at the four corners of the frame bottom plate and each is sleeved with a support spring. The probe clamping and adjusting mechanism is sleeved on all the guide columns and support springs and keeps the whole in a horizontally floating state. The positioning rollers and the probe mounting seats are respectively installed on the top of the probe clamping and adjusting mechanism.

6. The inspection device for the circumferential weld of the plastic inner container according to claim 5, wherein: The probe clamping and adjusting mechanism is provided with a first adjusting tooling, and the first adjusting tooling adjusts the spacing of the positioning rollers through screw drive.

7. The detection device for the circumferential weld of the plastic inner liner according to claim 5, characterized in that: The probe clamping and adjusting mechanism is provided with a second adjusting tooling, and the second adjusting tooling adjusts the spacing between the probe mounting seat and the phased array ultrasonic probe installed thereon through screw drive.

8. The detection device for the circumferential weld of the plastic inner liner according to claim 1, wherein: The water tank is composed of an external frame, a skin, and an internal cavity. And there are a water level monitoring and abnormal alarm in the water tank, as well as a water injection faucet, an overflow port, and a drain port arranged vertically. The external frame is integrally connected to the main body base; There is a linear rack beside the guide rail. The driving end is integrated with a first servo motor and a first transmission gear. The driven end is integrated with a second servo motor and a second transmission gear. The two transmission gears are both meshed with the linear rack, and the control ends of the two servo motors are signal-connected to the industrial computer on the operating table; The driving end is integrated with a first lifter, and the driven end is integrated with a second lifter. The driving ends of the two lifters are signal-connected to the industrial computer on the operating table; Each inspection trolley is provided with a frame bottom plate, a probe clamping and adjusting mechanism, positioning rollers, a phased array ultrasonic probe, a probe mounting seat, guide columns and support springs. The frame bottom plate is equipped with traveling rollers for translation in the water tank. A number of guide columns are vertically installed at the four corners of the frame bottom plate and each is sleeved with a support spring. The probe clamping and adjusting mechanism is sleeved on all the guide columns and support springs and keeps the whole in a horizontally floating state. The positioning rollers and the probe mounting seat are respectively installed on the top of the probe clamping and adjusting mechanism. The probe clamping and adjusting mechanism is provided with a first adjusting tooling and a second adjusting tooling. The first adjusting tooling adjusts the distance between the positioning rollers through screw rod transmission, and the second adjusting tooling adjusts the distance between the probe mounting seat and the phased array ultrasonic probe mounted thereon through screw rod transmission.

9. A method for detecting the circumferential weld of a plastic inner liner, which is implemented based on the operation of the detection device described in claim 8, is characterized in that It includes the steps: S1, load the workpiece to be inspected on the positioning rollers of the inspection trolley for temporary support, adjust the distance between the positioning rollers according to the workpiece specifications using the first adjusting tooling, and adjust the distance between the phased array ultrasonic probes according to the width of the circumferential weld using the second adjusting tooling. S2, set the operating parameters of the active end and the driven end using the human-machine interface of the operation console, move the active end along the height Z1 axis and the horizontal X1 axis to the pre-clamping position corresponding to the workpiece to be inspected, and move the driven end along the height Z2 axis and the horizontal X2 axis to the clamping position corresponding to the workpiece to be inspected, axially position the workpiece to be inspected and partially immerse its bottom side in water. S3, start the rotary drive mechanism to make the workpiece to be inspected rotate 360° along the R axis, calibrate the perimeter encoder for the circumferential weld inspection of the workpiece to be inspected, and suspend the drive for the rotation of the workpiece to be inspected after calibration is completed. The calibration accuracy is within ±1°. S4, start the phased array ultrasonic detection software preset in the industrial control computer and build a detection model according to the welding parameters of the circumferential weld. S5, drive the workpiece to be inspected to rotate again, use the height and width of the water layer between the outer wall of the workpiece to be inspected and the phased array ultrasonic probe as the angle of the acoustic emission wedge block in the adjustment of the detection process, and simultaneously perform on-line detection on a pair of circumferential welds. S6, after the inspection is completed, the active end and the driven end are respectively reset, and the workpiece to be inspected is unloaded or replaced from the positioning rollers.

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