A fully automated ultrasonic testing device for gas turbine tie rod bolts

Abstract

The present invention discloses a fully automated ultrasonic detection device for a gas turbine tie rod bolt, comprising a fixed base, a rotating base, a circumferential stroke device, an axial stroke device and a probe module; the fixed base is a circular ring structure, comprising a circular guide rail and an outer gear ring; the rotating base is a circular ring structure, with a guide rail groove arranged therein, engaged with the fixed base guide rail; the circumferential stroke device is a servo motor driven rotating gear structure, meshed with the fixed base gear, and externally connected to a circumferential control system; the axial stroke device is a servo motor driven ball screw linear module structure, comprising a servo motor, a coupling, a screw, a slider, a guide rail, a bracket, and an externally connected to an axial control system; the probe module is a retractable connecting tube and an ultrasonic probe fixing frame. The present invention can realize fully automated ultrasonic detection of tie rod bolts when the gas turbine tie rod bolts are not disassembled under the condition that the detection space is limited and cannot be reached manually, and accurately locate and record the circumferential / axial stroke of the ultrasonic probe.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and in particular is a fully automated ultrasonic testing device for tie rod bolts of a gas turbine. Background Art

[0002] The compressor rotor is one of the core components of the gas turbine to achieve energy conversion, among which the peripheral tie rod type is one of the most widely used rotor types. This type of compressor rotor is connected by multiple stacked discs + tie rod bolts. In addition to the preload of the bolts themselves, the tie rod bolts are also subjected to complex alternating stresses caused by various factors during service. Crack defects are easily generated at the bolt threads, posing a great hidden danger to the safe and stable operation of the unit. How to effectively detect crack defects at the tie rod bolt threads without disassembling the tie rod bolts has become a focus of attention for researchers at home and abroad.

[0003] Ultrasonic testing has the advantages of strong accessibility, no restrictions on the shape and size of components, no potential radiation damage to the human body, accurate and reliable test results, and high sensitivity. It is very suitable for ultrasonic testing when the bolts are not disassembled. At present, small-angle longitudinal wave oblique probes, straight probes or phased array probes are generally used for ultrasonic testing of bolt fasteners. In order to ensure that the ultrasonic probe scanning path is fixed, the scanning speed is consistent, the coupling force is stable, and other issues, an auxiliary scanning device must be used. However, the auxiliary scanning device patents currently disclosed are all semi-automatic, which can only realize automatic scanning and stroke position recording of the circumference of the bolts, but cannot realize automatic scanning and stroke position recording of the axial direction of the bolts. It cannot meet the fully automated technical requirements for ultrasonic testing when the pull rod bolts are not disassembled and the space is limited during on-site maintenance of gas turbines, and the circumferential / axial strokes must be precisely controlled and positioned.

[0004] Therefore, developing a fully automated ultrasonic detection device for gas turbine tie rod bolts to meet the needs of fully automated ultrasonic detection of tie rod bolts when space is limited on site and they are not manually accessible, and to achieve precise controllability and positioning of the circumferential / axial scanning stroke, is an urgent problem to be solved in the ultrasonic detection of gas turbine tie rod bolts. Summary of the invention

[0005] The purpose of the present invention is to provide a fully automated ultrasonic detection device for tie rod bolts of gas turbines in response to the current demand for fully automated technical requirements for ultrasonic detection of tie rod bolts with precise control and positioning of circumferential / axial strokes when the on-site space is limited and manual access is not possible during gas turbine maintenance. The device is simple and easy to operate, and can realize fully automated ultrasonic detection of tie rod bolts under the condition of limited detection space when the tie rod bolts are not disassembled, and can accurately locate and record the circumferential / axial stroke of the ultrasonic probe.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A fully automated ultrasonic detection device for a gas turbine tie rod bolt comprises a fixed base, a rotating base, a circumferential travel device, an axial travel device and a probe module; wherein:

[0008] The fixed base is a circular ring structure, including an upper circular guide rail, a lower circular outer gear ring, and four circumferentially distributed fixing studs connecting the circular guide rail 101 and the circular outer gear ring;

[0009] The rotating base is a circular ring structure with a guide rail groove on the inner side, and is embedded with the circular guide rail through the guide rail groove;

[0010] The circumferential stroke device includes a first servo motor, a rotating gear, a first bracket and a first interface. The circumferential stroke device is connected to the rotating base through the first bracket. The rotating gear is meshed with the circular outer gear ring of the fixed base. The first servo motor is used to drive the rotating gear to rotate. The first interface is externally connected to the circumferential control system.

[0011] The axial stroke device is a second servo motor driven ball screw linear module structure, and also includes a coupling, a slider, a guide rail, a second bracket and a second interface. The second bracket is connected to the rotating base, the screw and the guide rail are arranged in parallel, and both ends of the screw are movably connected to the second bracket, and both ends of the guide rail are connected to the second bracket. The slider is sleeved on the screw and the guide rail and is threadedly connected to the screw. The second servo motor is used to drive the screw to rotate through the coupling, and the second interface is externally connected to the axial control system.

[0012] The probe module consists of a retractable connecting tube, an ultrasonic probe fixing frame, an ultrasonic probe and a third interface. The fixed end of the connecting tube is connected to the slider of the axial stroke device, and the retractable end is connected to the ultrasonic probe fixing frame. The ultrasonic probe is fixed on the ultrasonic probe fixing frame. The third interface is externally connected to an ultrasonic flaw detector, and a coupling agent adding tube is provided at the front end of the probe fixing frame.

[0013] A further improvement of the present invention is that the circular guide rail of the fixed base is a T-shaped structure, the gear ring is a cylindrical gear, and the fixing studs are a hexagonal structure and are distributed at 90° along the circumferential direction.

[0014] A further improvement of the present invention is that the guide rail groove inside the rotating base is a T-shaped structure and is provided with bolt holes for connecting with the circumferential stroke device and the axial stroke device.

[0015] A further improvement of the present invention is that the rotating gear is a cylindrical gear, which has the same module as the circular external gear ring of the fixed base, and the circumferential control system is an integrated structure of a programmable logic controller, a driver and a switching power supply, and an external LCD touch screen input panel.

[0016] A further improvement of the present invention is that the linear module of the axial stroke device is an open module, the slider is a square structure with ball internal circulation, the guide rail is a double T-shaped guide rail that slides with the slider, the coupling is a plum blossom coupling, and the axial control system is an integrated structure of a programmable logic controller, a driver and a switching power supply, and an external LCD touch screen input panel.

[0017] A further improvement of the present invention is that the connecting sleeve is an inner sleeve and an outer sleeve embedded with a spring bracket and a spring structure, and is connected to the slider of the axial stroke device through the outer sleeve, and the ultrasonic probe fixing frame is connected to the inner sleeve.

[0018] A further improvement of the present invention is that the inner sleeve and the outer sleeve of the probe module are both cylindrical sleeves, the built-in spring bracket is a cylindrical structure, the spring bracket is connected to the slider stud of the slider, the spring is a compression spring, and the coupling agent adding tube at the front end of the ultrasonic probe fixing frame is an inverted Y-shaped structure for an external coupling agent connecting tube.

[0019] The present invention has the following beneficial technical effects:

[0020] The present invention provides a fully automated ultrasonic detection device for tie rod bolts of a gas turbine, which can realize fully automated ultrasonic detection of tie rod bolts when the tie rod bolts of the gas turbine are inspected without disassembly under the condition that the detection space is limited and cannot be reached manually, and can accurately locate and record the circumferential / axial stroke of the ultrasonic probe, with fast detection speed and accurate and reliable results, saving a lot of manpower and material costs, and can significantly reduce the inspection and maintenance costs of gas turbine power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a structural schematic diagram of a fully automated ultrasonic detection device for a gas turbine tie rod bolt.

[0022] Figure 2 It is a cross-sectional view of the fixed base and the rotating base.

[0023] Figure 3 is a cross-sectional view of the probe module.

[0024] Description of reference numerals:

[0025] 1. Fixed base, 2. Rotating base, 3. Circumferential travel device, 4. Axial travel device, 5. Probe module;

[0026] 101. circular guide rail, 102. circular outer gear ring, 103. fixing stud; 201. guide rail groove; 301. first servo motor, 302. rotating gear, 303. first bracket, 304. first interface, 305. first hexagon socket bolt; 401. second servo motor, 402. coupling, 403. lead screw, 404. slider, 405. guide rail, 406. second bracket, 407. second interface, 408. second hexagon socket bolt, 409. slider stud; 501. connecting tube, 502. ultrasonic probe fixing frame, 503. inner sleeve, 504. outer sleeve, 505. spring bracket, 506. spring, 507. ultrasonic probe, 508. third interface, 509. coupling agent adding tube, 510. third hexagon socket bolt, 511. fourth hexagon socket bolt, 512. fifth hexagon socket bolt. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0028] See attached Figure 1 , Attachment Figure 2 and attached Figure 3 The present invention provides a fully automated ultrasonic detection device for a gas turbine tie rod bolt, comprising a fixed base 1, a rotating base 2, a circumferential stroke device 3, an axial stroke device 4 and a probe module 5.

[0029] Among them, the fixed base 1 is a circular ring structure, with a circular guide rail 101 on the upper part, a circular outer gear ring 102 on the lower part, and 4 fixed studs 103 distributed circumferentially; the rotating base 2 is a circular ring structure, with a guide rail groove 201 inside, which is embedded with the circular guide rail 101 of the fixed base 1; the circumferential stroke device 3 is a first servo motor 301 driving a rotating gear 302 structure, which is meshed with the circular outer gear ring 102 of the fixed base 1, and is connected to the rotating base 2 using a first bracket 303, and the first interface 304 is externally connected to the circumferential control system (embedded programmable logic controller, driver, switching power supply); the axial stroke device 4 is a second servo motor 401 driving a ball screw 403 linear module structure, including a second servo motor 401, a coupling 402 The ultrasonic probe module 5 is composed of six parts, namely, a lead screw 403, a slider 404, a guide rail 405 and a second bracket 406, which are connected to the rotating base 2 through the second bracket 406. The second interface 407 is externally connected to the axial control system (with a built-in programmable logic controller, a driver, and a switching power supply); the probe module 5 consists of a retractable connecting tube 501 and an ultrasonic probe fixing frame 502. The connecting tube 501 is a structure in which an inner sleeve 503 and an outer sleeve 504 are embedded and a spring bracket 505 and a spring 506 are built in. It is connected to the slider 404 of the axial stroke device 4 through the outer sleeve 504. The ultrasonic probe 507 is fixed on the ultrasonic probe fixing frame 502. The third interface 508 is externally connected to an ultrasonic flaw detector. A coupling agent adding tube 509 is arranged at the front end of the ultrasonic probe fixing frame 502.

[0030] The circular guide rail 101 of the fixed base 1 is a T-shaped structure, the circular outer gear ring 102 is a cylindrical gear, and the fixing studs 103 are distributed along the circumference at 90 degrees and are a hexagonal structure.

[0031] The guide rail groove 201 provided in the rotating base 2 is a T-shaped structure and is provided with bolt holes for connecting with the circumferential stroke device 3 and the axial stroke device 4 .

[0032] The rotating gear 302 of the circumferential stroke device 3 is a cylindrical gear, which has the same module as the circular external gear ring 102 of the fixed base 1. The first bracket 303 is connected to the rotating base 2 by a first hexagon socket bolt 305. The programmable logic controller, driver, and switching power supply in the circumferential control system are an integrated structure, and an external LCD touch screen input panel is provided.

[0033] The linear module of the axial stroke device 4 is an open module, the slider 404 is a square structure with ball internal circulation, the guide rail 405 is a double T-shape, and is in sliding cooperation with the slider 404, the coupling 402 is a plum blossom coupling, and the second bracket 406 is connected to the rotating base 2 by a second hexagon socket bolt 408. The programmable logic controller, driver, and switching power supply in the axial control system are an integrated structure, and an external LCD touch screen input panel is provided.

[0034] The inner sleeve 503 and the outer sleeve 504 of the probe module 5 are both cylindrical sleeves, the built-in spring bracket 505 is a cylindrical structure, the spring bracket 505 is connected to the slider stud 409 of the slider 404, the spring 506 is a compression spring, the outer sleeve 504 is connected to the slider 404 by a third hexagon socket bolt 510, the inner sleeve 503 is connected to the ultrasonic probe fixing frame 502 by a fourth hexagon socket bolt 511, two fifth hexagon socket bolts 512 are arranged on both sides of the ultrasonic probe fixing frame 502, and the coupling agent adding tube 509 at the front end of the ultrasonic probe fixing frame 502 is an inverted Y-shaped structure, which is used for an external coupling agent connecting tube.

[0035] See attached Figure 1 , Attachment Figure 2 and attached Figure 3 In practical application, the steps of using the present invention are as follows:

[0036] 1. Place the fixing base 1 on the head of the tie rod bolt of the gas turbine to be tested, and tighten the fixing bolt 103;

[0037] 2. Connect the first interface 304 of the circumferential travel device 3 to the external circumferential control system;

[0038] 3. Connect the second interface 407 of the axial stroke device 4 to the external axial control system;

[0039] 4. Place the ultrasonic probe 507 in the probe fixing frame 502, tighten the fifth hexagon socket bolt 512, and connect the third interface 508 to the ultrasonic flaw detector system;

[0040] 5. Connect the coupling agent adding tube 509 to the external coupling agent connecting tube;

[0041] 6. Turn on all system switch power supplies and return the positions of the circumferential stroke device 3 and the axial stroke device 4 to zero;

[0042] 7. Set the circumferential step angle, rotation speed and other parameters on the circumferential control system touch screen, set the axial step displacement, moving speed and other parameters on the axial control system touch screen, and set the probe frequency, gain value and other parameters in the ultrasonic flaw detector system.

[0043] 8. Start the test, the circumferential stroke device 3 starts and rotates a certain angle → stops → the axial stroke device 4 starts, the slider 404 reciprocates once → stops → the circumferential stroke device 3 starts and rotates a certain angle, and executes in this order in a cycle until the circumferential stroke device rotates 360° to complete the test. During this period, the circumferential control system and the axial control system both display and store their respective position and stroke data in real time on the touch screen, and the ultrasonic flaw detector system displays and stores the ultrasonic waveform data in real time.

[0044] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully automated ultrasonic detection device for gas turbine tie rod bolts, characterized in that: It comprises a fixed base (1), a rotating base (2), a circumferential stroke device (3), an axial stroke device (4) and a probe module (5); wherein: The fixed base (1) is a circular ring structure, comprising an upper circular guide rail (101), a lower circular outer gear ring (102), and four circumferentially distributed fixing studs (103) connecting the circular guide rail (101) and the circular outer gear ring (102); The rotating base (2) is a circular ring structure, with a guide rail groove (201) formed inside, and is embedded with the circular guide rail (101) through the guide rail groove (201); The circumferential stroke device (3) comprises a first servo motor (301), a rotating gear (302), a first bracket (303) and a first interface (304); the circumferential stroke device (3) is connected to the rotating base (2) via the first bracket (303); the rotating gear (302) is meshed with a circular outer gear ring (102) of the fixed base (1); the first servo motor (301) is used to drive the rotating gear (302) to rotate; and the first interface (304) is externally connected to a circumferential control system; The axial stroke device (4) is a linear module structure in which a second servo motor (401) drives a ball screw (403), and further comprises a coupling (402), a slider (404), a guide rail (405), a second bracket (406) and a second interface (407). The second bracket (406) is connected to the rotating base (2). The screw (403) and the guide rail (405) are arranged in parallel, and both ends of the screw (403) are movably connected to the second bracket (406). Both ends of the guide rail (405) are connected to the second bracket (406). The slider (404) is sleeved on the screw (403) and the guide rail (405), and is threadedly connected to the screw (403). The second servo motor (401) is used to drive the screw (403) to rotate through the coupling (402). The second interface (407) is externally connected to the axial control system. The probe module (5) comprises a retractable connecting tube (501), an ultrasonic probe fixing frame (502), an ultrasonic probe (507) and a third interface (508); the fixed end of the connecting tube (501) is connected to a slider (404) of an axial stroke device (4); the retractable end is connected to the ultrasonic probe fixing frame (502); the ultrasonic probe (507) is fixed on the ultrasonic probe fixing frame (502); the third interface (508) is externally connected to an ultrasonic flaw detector; and a coupling agent adding tube (509) is arranged at the front end of the probe fixing frame (502).

2. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 1, characterized in that: The circular guide rail (101) of the fixed base (1) is a T-shaped structure, the gear ring (102) is a cylindrical gear, and the fixing studs (103) are hexagonal structures and are distributed at 90 degrees along the circumference.

3. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 1, characterized in that: The guide rail groove (201) on the inner side of the rotating base (2) is a T-shaped structure and is provided with bolt holes for connecting with the circumferential stroke device (3) and the axial stroke device (4).

4. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 1, characterized in that: The rotating gear (302) is a cylindrical gear having the same module as the circular outer gear ring (102) of the fixed base (1). The circumferential control system is an integrated programmable logic controller, a driver and a switching power supply, and an external liquid crystal touch screen input panel.

5. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 1, characterized in that: The linear module of the axial stroke device (4) is an open module, the slider (404) is a square structure with ball inner circulation, the guide rail (405) is a double T-shaped guide rail, which is in sliding cooperation with the slider (404), the coupling (402) is a plum blossom coupling, and the axial control system is an integrated programmable logic controller, a driver and a switching power supply, and an external liquid crystal touch screen input panel.

6. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 1, characterized in that: The connecting tube (501) is a structure in which an inner sleeve (503) and an outer sleeve (504) are embedded and a spring bracket (505) and a spring (506) are built in. The outer sleeve (504) is connected to a slider (404) of an axial stroke device (4), and an ultrasonic probe fixing frame (502) is connected to the inner sleeve (503).

7. A fully automated ultrasonic detection device for gas turbine tie rod bolts according to claim 6, characterized in that: The inner sleeve (503) and the outer sleeve (504) of the probe module (5) are both cylindrical sleeves, the built-in spring bracket (505) is a cylindrical structure, the spring bracket (505) is connected to the slider stud (409) of the slider (404), the spring (506) is a compression spring, and the coupling agent adding tube (509) at the front end of the ultrasonic probe fixing frame (502) is an inverted Y-shaped structure for connecting an external coupling agent connecting tube.

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