阅读说明：本技术 核电站低压缸红套转子汽轮机叶片叶根超声相控阵全自动检测方法 (Blade root ultrasonic phased array full-automatic detection method for low-pressure cylinder red-jacket rotor steam turbine of nuclear power station ) 是由 陈帅 卢立刚 潘跃 汪缔洪 张欢 崔文辉 杨列堂 陆自立 刘伯欢 王国栋 桑建军 于 2019-11-19 设计创作，主要内容包括：本发明涉及核电站低压缸红套转子汽轮机叶片叶根超声相控阵全自动检测方法,其依据不同检测区域确定相控阵探头的设置和行走区域,将相控阵探头设置在所述叶片根部的外弧侧检测所述叶片根部的内弧侧面、将相控阵探头设置在所述叶片根部的内弧侧检测所述叶片根部的外弧侧面、将相控阵探头设置在所述叶片根部出气侧的外弧侧平台检测所述叶片根部出气侧的内弧和外弧侧面、将相控阵探头设置在所述叶片根部进气侧的外弧侧平台检测所述叶片根部进气侧的内孤和外弧侧面。本发明可以在不吊缸和拆装叶片的情况下对叶片根部进行检测,且操作简单,数据判读精确。(The invention relates to a full-automatic ultrasonic phased array detection method for a blade root of a low-pressure cylinder red sleeve rotor steam turbine of a nuclear power station, which determines the setting and walking areas of a phased array probe according to different detection areas, sets the phased array probe on the outer arc side of the blade root to detect the inner arc side surface of the blade root, sets the phased array probe on the inner arc side of the blade root to detect the outer arc side surface of the blade root, sets the phased array probe on an outer arc side platform on the gas outlet side of the blade root to detect the inner arc side surface and the outer arc side surface of the gas outlet side of the blade root, and sets the phased array probe on an outer arc side platform on the gas inlet side of the blade root to detect the inner arc side surface and the outer arc side surface of the gas inlet side of the blade root. The invention can detect the root of the blade under the conditions of not hanging the cylinder and dismounting the blade, and has simple operation and accurate data interpretation.)

1. The full-automatic ultrasonic phased array detection method for the blade root of the blade of the red sleeve rotor turbine of the low-pressure cylinder of the nuclear power station comprises the following steps:

detecting the side surface of the inner arc: arranging a phased array probe on the outer arc side of the root of the blade, and detecting the side surface of an inner arc;

detecting the side surface of an outer arc: arranging a phased array probe on the inner arc side of the root of the blade, and detecting the outer arc side;

detection at the air outlet side: arranging a phased array probe on an outer arc side platform on the gas outlet side of the root part of the blade, and detecting the inner arc side surface and the outer arc side surface of the gas side;

and (3) air inlet side detection: and arranging a phased array probe on an outer arc side platform of the air inlet side of the root part of the blade, and detecting the inner arc side surface and the outer arc side surface of the air inlet side.

2. The inspection method according to claim 1, wherein the same phased array probe is used for the inner arc side inspection and the outer arc side inspection, a wedge is provided inside the phased array probe for the inner arc side inspection and the outer arc side inspection, the physical angle of the wedge is 35 ° to 55 °, and a plurality of wafers for inspection are uniformly provided on the obliquely upward surface of the wedge.

3. The inspection method according to claim 1, wherein the same phased array probe is used for the inspection at the air inlet side and the inspection at the air outlet side, and a plurality of wafers for inspection are uniformly arranged inside the phased array probe used for the inspection at the air inlet side and the inspection at the air outlet side.

4. The inspection method according to any one of claims 1 to 3, wherein the equipment for inspection comprises a phased array probe, a scanner, a drive control device and a water spraying system, the phased array probe is arranged on the scanner, the scanner moves according to the scanner movement command sent by the drive control device, the phased array probe performs inspection according to the phased array probe inspection command sent by the drive control device, the water spraying system is provided with a water tank, a water pump and a water spraying device which are sequentially connected through a pipeline, the water stored in the water tank is driven to the water spraying device through the water pump, and the water spraying device sprays water to the traveling position of the phased array probe at the root of the blade.

5. The inspection method according to claim 4, wherein the scanner for air inlet side inspection and air outlet side inspection comprises a motion carrying device and a probe fixing device, the probe fixing device is installed at the lower end of the motion carrying device, the phased array probe is installed at the lower end of the probe defining device, and the motion carrying device is arranged on the blade mounting rail, movably connected with the blade mounting rail and capable of moving along the blade mounting rail.

6. A mechanical structure according to claim 5, wherein the main body of the motion carrying device is a motion carrying base frame, the motion carrying base frame is provided with a roller mechanism engaged with the blade mounting rail, and at least one of the rollers engaged with the blade mounting rail is provided with a rotary encoder.

7. The mechanical structure according to claim 6, wherein said roller mechanism includes an upper roller and a lower roller, said blade mounting rail is provided with an upper roller groove having a notch facing upward and a lower roller groove having a notch facing downward, said upper roller groove and said lower roller groove being engaged with said upper roller, and a lower portion of said upper roller and an upper portion of said lower roller are inserted into said upper roller groove and said lower roller groove, respectively.

8. The mechanical structure as claimed in claim 7, wherein the main body part of the probe fixing device is a probe fixing base frame, the upper end of the probe fixing base frame is connected with the lower end of the motion bearing base frame in a shaft hole matched rotary connection mode, and a locking device is arranged on the probe fixing base frame.

9. The mechanical structure as claimed in claim 8, wherein the main body of the probe is a probe base frame, the upper end of the probe base frame is connected with the lower end of the probe fixing base frame in a rotating connection mode of shaft hole fit and is provided with or not provided with a locking device, and a spring thrust mechanism for pushing the probe to the surface of the blade is arranged between the upper end of the probe base frame and the lower end of the probe fixing base frame.

10. The mechanical structure of claim 9, wherein the spring thrust mechanism comprises a coil spring sleeved on the rotating connecting shaft between the upper end of the probe base frame and the lower end of the probe fixing base frame, one end of the coil spring extends outwards to press or fix on the probe fixing base frame, the other end of the coil spring extends outwards to press or fix on the probe base frame, and the coil spring is provided with a prestress.

Technical Field

The invention relates to a full-automatic ultrasonic phased array detection method for blade roots of blades of a red sleeve rotor steam turbine of a low-pressure cylinder of a nuclear power station, and belongs to the technical field of ultrasonic inspection of phased arrays.

Background

The steam turbine is the essential operating equipment when power plant generates electricity, because high-speed rotatory blade produces centrifugal force and leads to the fact stress concentration to the blade root, after the operation of certain years, the blade root forms stress fatigue crack easily, and the crackle all produces on the surface of blade root, this kind of crackle harmfulness is very big, when the crack extension reaches the certain degree, the blade flies out the factory building easily and causes the accident, consequently there is great potential safety hazard in the crackle of blade root, consequently need detect in order to ensure steam turbine safe operation to the blade root.

The existing method for detecting the root of the blade has various methods, such as an eddy current technology, a magnetic powder technology, a penetration technology, a conventional ultrasonic technology and the like, but the method for detecting the root of the blade by adopting the technologies needs to firstly hang a cylinder, then the blade is detached from a rotor one by one for detection, the blade is required to be installed on the rotor after the detection is finished, the time for assembling and disassembling the blade is almost equal to the time for detecting the blade, a large amount of time is consumed, and the working efficiency is influenced.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a full-automatic detection method for the blade root of the blade of the red sleeve rotor steam turbine of the nuclear power station, which can be used for detecting the blade root without hanging a cylinder and dismounting the blade, and has the advantages of simple operation and accurate data interpretation.

The technical scheme of the invention is as follows: the full-automatic ultrasonic phased array detection method for the blade root of the blade of the red sleeve rotor turbine of the low-pressure cylinder of the nuclear power station comprises the following steps:

detecting the side surface of the inner arc: arranging a phased array probe on the outer arc side of the root of the blade, and detecting the side surface of an inner arc;

detecting the side surface of an outer arc: arranging a phased array probe on the inner arc side of the root of the blade, and detecting the outer arc side;

detection at the air outlet side: arranging a phased array probe on an outer arc side platform on the gas outlet side of the root part of the blade, and detecting the inner arc side surface and the outer arc side surface of the gas side;

and (3) air inlet side detection: and arranging a phased array probe on an outer arc side platform of the air inlet side of the root part of the blade, and detecting the inner arc side surface and the outer arc side surface of the air inlet side.

The following modes are adopted for detecting each part;

1) installing a phased array probe on a scanning device, wherein the detection signal output end of the phased array probe is connected with the detection signal input end of an ultrasonic phased array detector through a phased array cable;

2) placing the scanner in a corresponding region of a blade root;

3) controlling a scanner to walk in a corresponding area on the root of the blade, and spraying water at the walking position of the phased array probe along with the walking of the phased array probe, so as to scan and detect the root of the blade in the walking process;

4) transmitting the detection data of the phased array probe to an ultrasonic phased array detector through the phased array cable, and storing the detection data in the ultrasonic phased array detector;

5) importing the detection data in the ultrasonic phased array detector into a computer for defect interpretation and analysis;

6) after the detection of each part is completed, the detection data and the analysis result of each part are summarized through a computer to form a detection report of the blade root.

The detection areas of the detection steps should be connected with each other to form complete detection of the detection areas.

The detection area of each detection step is allowed to have an overlapping part, when the overlapping part has different detection results, the judgment can be carried out in a manual intervention mode to determine the correct detection result, the result with obviously high reliability or accuracy can be selected according to the reliability or accuracy of the detection in the corresponding area in different steps, the result with the detected defects can also be used as the detection result of the overlapping area, and when the two detection results in the overlapping area are both detected to have the defects and have the different defects, all the different defects can be listed in the detection result so as to carry out proper treatment in the subsequent process.

For the detection of different positions, a phased array probe corresponding to each detection position should be adopted.

The same phased array probe can be used for inner arc side surface detection and outer arc side surface detection, a wedge block is arranged in the phased array probe for inner arc side surface detection and outer arc side surface detection, the physical angle of the wedge block is 35-55 degrees, and a plurality of detection wafers, for example, preferably 12 detection wafers are uniformly arranged on the obliquely upper surface of the wedge block.

The same phased array probe can be used for the air inlet side detection and the air outlet side detection, and a plurality of detection wafers, for example, preferably 10 detection wafers, are uniformly arranged in the phased array probe for the air inlet side detection and the air outlet side detection.

The equipment for detection generally comprises a phased array probe, a scanning device, a drive control device and a water spraying system, wherein the phased array probe is arranged on the scanning device, the scanning device moves according to a scanning device motion command sent by the drive control device, the phased array probe detects according to a phased array probe detection command sent by the drive control device, the water spraying system is provided with a water tank, a water pump and a water spraying device which are sequentially connected through a pipeline, the water stored in the water tank is pumped into the water spraying device through the water pump, and the water spraying device sprays water to the root of a blade on the walking position of the phased array probe.

The scanning device for air inlet side detection and air outlet side detection comprises a motion bearing device and a probe fixing device, wherein the probe fixing device is installed at the lower end of the motion bearing device, the phased array probe is installed at the lower end of the probe regulating device, and the motion bearing device is arranged on a blade installation track (track for short), is movably connected with the blade installation track and can move along the blade installation track.

The main body part of the movement bearing device can be a movement bearing base frame, and a roller mechanism matched with the blade mounting rail is preferably arranged on the movement bearing base frame.

At least one roller of the roller mechanism which is in rolling fit with the blade mounting rail (connected in a connection mode of being in contact with the surface of the blade mounting rail and rolling relative to the blade mounting rail) is provided with a rotary encoder, and the sliding condition or data (such as the moving distance or the real-time position) of the motion carrying device relative to the rail can be calculated through the output of the encoder, so that the real-time detection position can be determined.

The rotary encoder may be of any suitable prior art, for example a grating encoder.

The roller mechanism may include an upper roller and a lower roller, and the number of the upper roller and the lower roller may be one, or one of the rollers (e.g., the lower roller or the upper roller) may be one, and the other roller (e.g., the upper roller or the lower roller) may be plural (e.g., two). The arrangement of the roller mechanism can be adapted to the track conditions due to the curvature of the blade mounting track.

The blade mounting rail may be provided with an upper roller groove (usually, may be disposed on the top surface of the rail) having an upward notch, which is engaged with the upper roller, and a lower roller groove (usually, may be disposed on the bottom surface of the rail) having a downward notch, which is engaged with the lower roller, and the lower portion of the upper roller and the upper portion of the lower roller are inserted into the upper roller groove and the lower roller groove, respectively, and roll along the upper roller groove and the lower roller groove, thereby simultaneously achieving the movement engagement of the movement support device with the rail, the rolling engagement of the upper roller with the rail, and the anti-slip of the movement support device on the rail, and may further be provided with other anti-slip structures, for example, a clamping vertical bearing, which will be described later.

The motion bearing means is provided with a motion bearing means drive mechanism capable of driving the motion bearing means relative to the blade mounting rail, the motion bearing means drive mechanism may be of any suitable prior art, for example, the shaft of the motor (usually, a reduction motor, preferably, a dc servo motor with a gear reducer, the same applies below) and each belt wheel (sprocket) of the belt (chain) transmission mechanism (including a driving wheel, a driven wheel and a middle supporting wheel) may be fixedly connected to the blade mounting rail, specifically, the main body portion of the movement bearing device is fixedly connected to the driving belt (chain) of the belt (chain) transmission mechanism according to the shape, size, etc. of the blade mounting rail, and when the motor rotates, the movement bearing device is driven by the driving belt (chain) to move along the rail; for another example, the motor and the driving wheel are both fixedly mounted on the motion carrying device, wherein the driving wheel is in rolling friction contact with the blade mounting rail (connected in a manner that allows the driving wheel to roll relative to the blade surface and generates friction force due to relative motion tendency generated between the mutual contact surfaces due to the relative rolling), and the force for pushing the motion carrying device to move is formed by the friction force between the driving wheel and the rail surface, so that the motion carrying device is driven by the motor to move along the rail.

The motion bearing device is provided with an anti-slip structure matched with the blade mounting rail to prevent the motion bearing device from slipping off the rail, and the anti-slip structure can adopt any suitable prior art, such as baffles blocking the left side and the right side of the rail or vertically extending lugs; if the blade installation track is vertically clamped by the two vertical clamping bearings, the blade installation track is fixedly installed on the same clamping bearing support of the same group of vertical clamping bearings, the clamping bearing support is vertically and rotatably (the rotation axis is vertical) connected to the main body part of the motion bearing device, and therefore when the track is bent, the motion bearing device can still stably and accurately move.

The main body part of the probe fixing device can be a probe fixing base frame, the upper end of the probe fixing base frame is preferably connected with the lower end of the movement bearing base frame in a shaft hole matched rotary connection mode, and a locking (fixing) device is arranged, for example, locking nuts which are connected with the upper end of the probe fixing base frame and the two ends of a rotary connecting shaft between the lower ends of the movement bearing base frame in a rotary mode are screwed, and the upper end of the probe fixing base frame and the lower end of the movement bearing base frame which are connected together in a shaft hole matched rotary mode can be fastened together by screwing the locking nuts. This connection allows the probe mounting base to be angled relative to the mobile carrier base to better accommodate the curved shape of the contact with the probe.

The main body part of the probe is a probe base frame. When a phased array probe is used, a wafer for inspection for forming a phased array is mounted on the probe base frame.

The upper end of the probe base frame is preferably connected with the lower end of the probe fixing base frame in a shaft hole matched rotary connection mode, and a locking (fixing) device is arranged or not arranged. The locking device for shaft hole matching can adopt any suitable prior art, for example, locking nuts which are screwed at two ends of a rotary connecting shaft between the upper end of the probe base frame and the lower end of the probe fixing base frame can fasten the upper end of the probe base frame and the lower end of the probe fixing base frame which are connected together in a shaft hole matching mode in a rotating mode together by screwing the locking nuts. This connection allows the probe mount to be angled relative to the probe mounting mount to better accommodate the curved shape of the contact with the probe.

A spring thrust mechanism for pushing the probe to the surface of the blade may be further disposed between the upper end of the probe base frame and the lower end of the probe fixing base frame, for example, the spring thrust mechanism includes a coil spring sleeved on a rotating connecting shaft between the upper end of the probe base frame and the lower end of the probe fixing base frame, one end of the coil spring extends outwards and presses or is fixed on the probe fixing base frame, the other end of the coil spring extends outwards and presses or is fixed on the probe base frame, the coil spring is preferably provided with a pre-stress (for example, an elastic force generated by reverse torsion), the pre-stress is in a direction of pushing the probe to the surface of the blade, and an elastic force of the coil spring is appropriately selected, so that the probe is always kept in contact with the surface of the blade during. When the locking device is arranged, when the spring thrust mechanism is required to play a role, the locking device is loosened or the locking force of the locking device is properly reduced, so that the situation that the function of the spring thrust mechanism is hindered due to the fact that the upper end of the probe base frame and the lower end of the probe fixing base frame are locked is avoided.

Generally, the number of the spiral springs of the spring thrust mechanism can be two, the spiral springs are respectively sleeved on the left side and the right side of the rotating connecting shaft and are arranged in a mirror symmetry mode, and therefore balance of spring forces of the left side and the right side is guaranteed. In this case, of the upper end of the probe base frame and the lower end of the probe fixing base frame, one connecting portion is located between the left and right coil springs, and the other connecting portion is divided into two portions, which are located on the left and right outer sides of the coil springs (left side of the left coil spring and right side of the right coil spring), respectively.

In practical application, at first with suitable blade erection track install on the blade body, then with the motion bear the weight of the device and install on blade erection track, install phased array probe fixing device in the lower terminal surface that the motion bore the device after, with the phased array probe pass through fastening screw and install on phased array probe fixing device, the probe alright in order to laminate in steam turbine blade body position, realize the phased array of steam turbine blade outer arc tooth root and detect the task.

The invention has the beneficial effects that: different phased array probe positions or walking areas are set according to different detection areas, so that the detection of each area of the blade root can be effectively carried out, the detection can be realized, and accurate and reliable detection data can be obtained. Meanwhile, a special scanner which can be effectively applied to detection of the air inlet side and the air outlet side is developed, the problem that the existing scanner is difficult to adapt to detection of special areas is solved, the motion bearing device is guided to move along a required route by the blade mounting track, the special appearance of the root of the blade is adapted, and the accuracy of the walking track of the scanner is ensured; applying a spring force with a proper magnitude for pushing the probe surface of the probe to the surface of the blade to the probe fixing device through a spring mechanism, and keeping the coupled state of the phased array probe in the moving process; the roller (rolling bearing) of the motion bearing device moves on the rail, effective moving signals are provided, the roller rotating signals collected by the encoder for recording the rotation of the roller are set, the motion state of the motion bearing device, particularly the moving distance on the blade mounting rail can be calculated, and the encoding record of phased array data is ensured.

The method for detecting the root of the blade can complete tasks on the basis of not hoisting a cylinder and not dismantling the blade, is simple to operate, has accurate data interpretation, obviously reduces the equipment outage time, and improves the economic benefit; the automatic detection can be realized by controlling the scanning device and the phased array probe through the driving control device, so that the detection process is more simple and the detection result is more accurate.

Drawings

FIG. 1 is a schematic front view of a dedicated scanner for inlet and outlet side detection in accordance with the present invention;

FIG. 2 is a schematic rear view of a dedicated scanner for inlet and outlet side detection in accordance with the present invention;

fig. 3 is a schematic diagram of a detection mode of a special scanner for detecting an air inlet side and an air outlet side according to the invention.

Detailed Description

The invention determines the setting and walking area of the phased array probe according to different detection areas, and specifically comprises the following steps: the method comprises the steps of setting a phased array probe on the outer arc side of a blade root to detect the inner arc side face of the blade root, setting the phased array probe on the inner arc side face of the blade root to detect the outer arc side face of the blade root, setting the phased array probe on the outer arc side platform on the air outlet side of the blade root to detect the inner arc and the outer arc side face on the air outlet side of the blade root, and setting the phased array probe on the outer arc side platform on the air inlet side of the blade root to detect the inner arc and the outer arc side face on the air inlet side of the blade root.

The equipment for detection can comprise a scanner, a phased array probe, an ultrasonic phased array detector, a drive control device, a water pump and a water tank, wherein the phased array probe can be installed on the scanner by adopting a proper prior art, the detection signal output end of the phased array probe can be directly connected with the detection signal input end of the ultrasonic phased array detector through a phased array cable, a setting file corresponding to different positions of the root of the blade is stored in the ultrasonic phased array detector, the setting file comprises a program for setting and modifying the walking position, the walking distance and the detection range of the phased array probe on the root of the blade and a program for leading detection data of different parts of the root of the blade detected by the phased array probe into the ultrasonic phased array detector so as to facilitate the phased array probe to detect the root of the blade, setting a detection position, a distance and a range, and leading detection data into the ultrasonic phased array detector, wherein a control signal output end of the driving control device can be connected with a control signal input end of the scanner through a control cable, and the driving control device controls the scanner to move correspondingly and controls the phased array probe to detect correspondingly according to a sent instruction. The basin is used for storing water, can through the water pipe with the end connection of intaking of water pump, the play water end of water pump can be through water piping connection the phased array probe, the control signal input of water pump passes through water pump control cable junction drive control device's water pump control signal output end, during the detection, can pass through drive control device sends the water pump control instruction, drive device is according to control instruction control the work of water pump, through the water pipe play water end of connecting on the phased array probe to the walking position water spray of phased array probe, the coupling during the detection of being convenient for.

In order to facilitate detection and enable detection data to be more accurate, different phased array probes corresponding to detection positions are adopted for detection of different positions of the blade root.

When the inner arc side face and the outer arc side face of the blade root are detected, the same phased array probe can be used, a wedge block can be arranged in the phased array probe, the physical angle of the wedge block can be 33-55 degrees, preferably 40.8 degrees, 12 detection wafers can be uniformly arranged on the obliquely upward surface of the module, the distance from the vertically lowest wafer to the bottom face of the wedge block can be 2mm, the distance from the front edge of the wedge block can be 11.73mrn degrees, the center distance of each wafer can be 0.5 mrn degrees, the gap between each wafer can be 0.1mm, the total width of the 12 wafers can be 5mm, the total length can be 5.9mrn degrees, and the working frequency of the phased array probe can be 3-5 MHz.

When the inner arc side and the outer arc side of the air outlet side and the inner arc side and the outer arc side of the air inlet side of the blade root are detected, the same phased array probe can be adopted, a wedge block can be arranged inside the phased array probe, the physical angle of the wedge block can be 35-55 degrees, preferably 36.2 degrees, 10 detection wafers can be uniformly arranged on the obliquely upward surface of the wedge block, the distance between the wafer which is positioned lowest in the vertical direction and the bottom surface of the wedge block can be 1.3mrn, the distance between the wafer which is positioned lowest in the vertical direction and the front edge of the wedge block can be 7.88mm, the center distance between the wafers can be 0.5mm, the distance between the wafers can be 0.1lmm, the total width of the 10 wafers can be 5mrn, the total length can be 4.9mm, and the working frequency of the phased array probe can be 3-5 MHz;

in order to facilitate the detection of the blade root, the size of each phased array probe can be made slightly smaller than that of a common detection probe.

The following steps can be adopted for detecting each part of the blade root:

1) installing a phased array probe on the scanning device, wherein the detection signal output end of the phased array probe is directly connected with the detection signal input end of an ultrasonic phased array detector through a phased array cable, and a setting file corresponding to a part to be detected is called or set in the ultrasonic phased array detector:

2) placing the scanner in an area on the root of the blade corresponding to the position to be detected of the phased array probe;

3) the scanning device is controlled to walk in a corresponding area on the root of the blade, water is sprayed at the walking position of the phased array probe along with the walking of the phased array probe, the root of the blade is scanned and detected in the walking process, the water pump can be controlled to spray water through the driving control device, and other suitable modes can also be adopted to spray water;

4) transmitting the detection data of the phased array probe to the ultrasonic phased array detector through the phased array cable, and storing the detection data in the ultrasonic phased array detector;

5) importing the detection data in the ultrasonic phased array detector into a computer for defect interpretation analysis, wherein the defect interpretation analysis of the detection data can use phased array analysis software or other appropriate software;

6) after the detection of each part is completed, the detection data and the analysis result of each part can be summarized through a computer to form a detection report of the blade root.

When the inner arc side surface of the blade root is detected, the phased array probe corresponding to the inner arc side surface of the blade root can be installed on the scanning device, other detection equipment is suitable for connection, a setting file stored in the ultrasonic phased array detector and used for detecting the inner arc side surface of the blade root is called, the scanning device can be arranged on the blade body on the outer arc side of the blade root, the driving control device controls the scanning device to walk and the water pump to spray water to the walking position of the phased array probe, and the inner arc side surface of the blade root is detected.

When the outer arc side surface of the blade root is detected, the phased array probe corresponding to the outer arc side surface of the blade root can be installed on the scanning device, other detection equipment is suitable for connection, a setting file stored in the ultrasonic phased array detector and used for detecting the outer arc side surface of the blade root is called, the scanning device can be arranged on the blade body on the inner arc side of the blade root, the driving control device controls the scanning device to walk and the water pump to spray water to the walking position of the phased array probe, and the outer arc side surface of the blade root is detected.

When the inner arc side and the outer arc side of the air outlet side of the blade root are detected, the phased array probe corresponding to the inner arc side and the outer arc side of the air outlet side of the blade root can be installed on the scanning device, other detection equipment is suitable for connection, the setting file of the inner arc side and the outer arc side of the air outlet side of the blade root is used for calling the detection stored in the ultrasonic phased array detector, the scanning device can be arranged on an outer arc side platform of the air outlet side of the blade root through a platform guide device, the scanning device is controlled to walk through the driving control device, and the water pump sprays water to the walking position of the phased array probe, so that the inner arc side and the outer arc side of the air outlet side of the blade root are detected.

When the inner arc side and the outer arc side of the air inlet side of the blade root are detected, the phased array probe corresponding to the inner arc side of the air inlet side of the blade root can be installed on the scanning device, other detection equipment is suitable for connection, a setting file for detecting the inner arc side and the outer arc side of the air outlet side of the blade root, which is stored in the ultrasonic phased array detector, is called, the scanning device can be arranged on an outer arc side platform of the air outlet side of the blade root through a platform guide device, the scanning device is controlled to walk through the driving control device, the water pump sprays water to the walking position of the phased array probe, and the inner arc side and the outer arc side of the air inlet side of the blade root are detected.

Fig. 1-3 show examples of special scanners for inlet and outlet side detection, which scanners are provided with a blade mounting rail 1 comprising a motion carrying device 2 that is movable on the blade mounting rail 1. The phased array probe fixing device 3 is installed on the lower end face of the movement bearing device 2, and the phased array probe fixing device 3 extends out of the lower portion of the movement bearing device 2, so that the phased array probe is attached to the surface of the blade body.

A spring structure 4 for adjusting the close fitting length of the probe is arranged between the motion bearing device 2 and the phased array probe fixing device 3. In practical application, can make the inseparable laminating steam turbine blade body surface of phased array probe 7 through spring structure 4 to the realization guarantees the purpose of the good coupling of probe, through spring structure 4, phased adaptation steam turbine blade body surface structure that then probe 7 can be better becomes, has strengthened the practicality. Meanwhile, in order to ensure the stability of the phased array probe in the moving process, a bearing structure 5 is added between the blade mounting rail 1 and the motion bearing device 2, so that the phased array probe can be more stable in moving, and the working performance of the phased array probe can be ensured.

In practical application, firstly, the blade mounting rail 1 is installed on a turbine blade 6, then the motion bearing device 2 is installed on the blade mounting rail 1 through the bearing structure 5, and then the phased array probe fixing device 3 with the phased array probe installed is fixed at the lower end of the motion bearing device 2, so that the phased array probe 7 can be attached to the turbine blade body 6 to execute a turbine in-situ detection task.

The above examples are only for describing the preferred embodiments of the present invention, and do not limit the scope of the claimed invention, and various modifications made by the skilled in the art according to the technical solution of the present invention should fall within the scope of the invention defined by the claims without departing from the spirit of the present invention.

The shaft hole matched rotary connection mode referred to in the specification means that one of two mutually connected pieces is fixedly connected with the rotary connecting shaft, and the other piece is sleeved on the rotary connecting shaft through a hole (a through hole and/or a blind hole) formed in the other piece and is in rotary fit with the rotary connecting shaft, and a bearing used for rotary fit can be arranged or not arranged.

The directional terms front, rear, left, right, upper and lower are used in the present specification only for the convenience of description with reference to the drawings, and are not intended to limit the technical aspects of the present invention and the scope of the claims.

The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.