Machine tool flaw detection mechanism for detecting surface quality of steam turbine rotating shaft

Abstract

The utility model discloses a machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, which comprises a base (1), two sides of the base (1) are respectively provided with a fixed seat (2), each fixed seat (2) is provided with a fixed head (21) for fixing the rotating shaft (6), and at least one fixed seat (2) is internally provided with a first motor (22) for driving the fixed head (21) to rotate; supports (31) are arranged above the fixed seat (2), a linear module (32) is arranged between the two supports (31), a mounting plate (33) is arranged on a sliding plate of the linear module (32), and a first flaw detection detector (4) used for detecting the circumferential surface of the rotating shaft (6) and a second flaw detection detector (5) used for detecting the side surface of a shaft shoulder of the rotating shaft (6) are arranged on the mounting plate (33). The device has the characteristics of comprehensive detection and high efficiency.

Description

Technical Field

[0001] The utility model relates to a machine tool flaw detection mechanism, in particular to a machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft. Background Art

[0002] The steam turbine rotating shaft is the core component of the steam turbine rotor. It connects all the rotating elements on the rotor and undertakes the important tasks of transmitting torque, supporting the impeller, and bearing various forces and thermal stresses. Therefore, the surface quality of the steam turbine rotating shaft is very important, which is directly related to the performance and reliability of the steam turbine.

[0003] During the processing of the steam turbine rotating shaft, due to some reasons, the surface of the rotating shaft may be uneven, with defects such as cracks, pores, and fissures. There may even be relatively large wounds on the surface of the shaft, making the rotating shaft prone to fatigue cracks during operation and then fracture, bringing many safety problems to production and use. Therefore, after the processing of the steam turbine rotating shaft is completed, it is necessary to detect the surface quality of the steam turbine rotating shaft.

[0004] The cross-section of the steam turbine rotating shaft is generally circular, and the two ends of the rotating shaft are usually designed with journal bearings for installing bearings or connecting to other mechanical components, so that the rotating shaft has a stepped structure. When detecting the surface quality flaw detection of the steam turbine rotating shaft, the detectors used are generally planar or point-type single-direction detectors. Therefore, most of them can only detect the outer circumferential surface of the rotating shaft and cannot detect the shoulder part of the journal bearing, and the detection is not comprehensive enough. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft. The utility model has the characteristics of comprehensive detection and high efficiency.

[0006] The technical solution of the utility model: A machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, including a base. Fixed seats are provided on both sides of the base. A fixed head for fixing the rotating shaft is provided on the fixed seat. At least one fixed seat is internally provided with a first motor for driving the fixed head to rotate; A bracket is provided above the fixed seat. A linear module is provided between the two brackets. An installation plate is provided on the slide plate of the linear module. A first flaw detector for detecting the circumferential surface of the rotating shaft and a second flaw detector for detecting the side surface of the shaft shoulder of the rotating shaft are provided on the installation plate.

[0007] In the aforementioned machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, the first flaw detector includes an installation ring sleeved outside the rotating shaft. A plurality of first flaw detection heads for inward detection are provided on the inner ring surface of the installation ring. The installation ring is fixedly connected to the installation plate through a connecting plate.

[0008] In the aforementioned machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, a slide rail is provided on the base between two fixed seats, and a slider slidably connected to the slide rail is provided at the bottom of the mounting ring.

[0009] In the aforementioned machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, the second flaw detector includes a second motor fixed on a mounting plate. A rotating plate is provided on the output shaft of the second motor. A servo electric cylinder is provided on the rotating plate. A mounting rod is provided on the servo electric cylinder. A second flaw detection head is provided on one side of the mounting rod.

[0010] In the aforementioned machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, the first flaw detector and the second flaw detector adopt ultrasonic flaw detection probes or eddy current flaw detection probes.

[0011] In the aforementioned machine tool flaw detection mechanism for detecting the surface quality of a steam turbine rotating shaft, a cooling fan is provided inside the fixed seat where the first motor is installed, and cooling holes are provided on the surface of the fixed seat where the first motor is installed.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, the two ends of the rotating shaft are fixed by the fixed heads of the fixed seats, so that the rotating shaft is in a horizontal state. The first motor provided drives the rotating shaft to rotate, realizing the rotary detection of the rotating shaft; a linear module, a first flaw detector and a second flaw detector are arranged above the fixed seat. The circumferential surface of the rotating shaft is detected for flaws by the first flaw detector, and the shoulder surface of the rotating shaft is detected by the second flaw detector, and the detection is more comprehensive; the first flaw detector and the second flaw detector move along the length direction of the rotating shaft on the linear module, and cooperate with the rotation of the rotating shaft to realize rapid detection, improving the detection efficiency and the comprehensiveness of detection. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model.

[0015] Figure 2 is a schematic structural diagram of the first flaw detector.

[0016] Figure 3 is a schematic structural diagram of the second flaw detector.

[0017] The reference signs in the drawings are: 1, base; 11, slide rail; 2, fixed seat; 21, fixed head; 22, first motor; 23, cooling fan; 24, cooling hole; 31, bracket; 32, linear module; 33, mounting plate; 4, first flaw detector; 41, mounting ring; 42, first flaw detection head; 43, connecting plate; 44, slider; 5, second flaw detector; 51, second motor; 52, rotating plate; 53, servo electric cylinder; 54, mounting rod; 55, second flaw detection head; 6, rotating shaft. Detailed implementation manners

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present utility model.

[0019] In the description of the present utility model, it should also be noted that, unless otherwise clearly defined and limited, the terms "arrange", "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0020] Embodiment:

[0021] As Figures 1 - 3 shown, a flaw detection mechanism for a machine tool for detecting the surface quality of a steam turbine rotating shaft includes a base 1. Fixed seats 2 are provided on both sides of the base 1. A fixed head 21 for fixing the rotating shaft 6 is provided on the fixed seat 2. At least one fixed seat 2 is provided with a first motor 22 for driving the fixed head 21 to rotate. A bracket 31 is provided above the fixed seat 2. A linear module 32 is provided between the two brackets 31. A mounting plate 33 is provided on the slide plate of the linear module 32. A first flaw detector 4 for detecting the circumferential surface of the rotating shaft 6 and a second flaw detector 5 for detecting the side surface of the shaft shoulder of the rotating shaft 6 are provided on the mounting plate 33.

[0022] The fixed seat 2 fixes both ends of the rotating shaft 6 through the fixing head 21, making the rotating shaft 6 in a horizontal state, and the fixing head 21 is rotatably connected to the fixed seat 2. The first motor 22 drives the rotating shaft 6 to rotate through the fixing head 21, realizing the rotational detection of the rotating shaft 6; a linear module 32, a first flaw detector 4 and a second flaw detector 5 are arranged above the fixed seat 2. The first flaw detector 4 performs flaw detection on the circumferential surface of the rotating shaft 6, and the second flaw detector 5 detects the shoulder surface of the rotating shaft 6, thereby detecting surface quality indicators such as cracks, hidden seams, air holes, and slag inclusions on the outer surface of the rotating shaft 6, and the detection is more comprehensive; the first flaw detector 4 and the second flaw detector 5 move along the length direction of the rotating shaft 6 on the linear module 32, and cooperate with the rotation of the rotating shaft to achieve rapid detection, improving the detection efficiency and comprehensiveness.

[0023] The first flaw detector 4 includes a mounting ring 41 sleeved outside the rotating shaft 6. A plurality of first flaw detection heads 42 for inward detection are arranged on the inner ring surface of the mounting ring 41. The mounting ring 41 is fixedly connected to the mounting plate 33 through a connecting plate 43. By surrounding the rotating shaft 6 with a plurality of annularly distributed first flaw detection heads 42, the outer peripheral surface of the rotating shaft 6 is comprehensively detected, and at the same time, driven by the linear module 32, it moves along the length direction of the rotating shaft 6, so as to quickly detect the rotating shaft.

[0024] A slide rail 11 is arranged on the base 1 between the two fixed seats 2. A slider 44 slidably connected to the slide rail 11 is arranged at the bottom of the mounting ring 41. When the mounting ring 41 moves driven by the linear module 32, the slider 44 moves on the slide rail 11 to ensure the stability and reliability of the movement of the mounting ring 41, and avoid deviation of the detection result caused by deviation or collision with the rotating shaft 6.

[0025] The second flaw detector 5 includes a second motor 51 fixed on the mounting plate 33. A rotating plate 52 is arranged on the output shaft of the second motor 51. A servo electric cylinder 53 is arranged on the rotating plate 52. An installation rod 54 is arranged on the servo electric cylinder 53. A second flaw detection head 55 is arranged on one side of the installation rod 54. The rotating shaft 6 is generally a symmetric structure, and the side positions of the shoulders are also symmetrically distributed. When the second flaw detector 5 moves to one end of the rotating shaft 6, the second flaw detection head 55 aligns with the shoulder part on one side of the rotating shaft 6 for detection; when the second flaw detector 5 moves to the other end of the rotating shaft 6, the second motor 51 drives the rotating plate 52 to rotate, thereby driving the second flaw detection head 55 to rotate to detect the shoulder part on the other side of the rotating shaft 6, and the detection is comprehensive and fast; and a servo electric cylinder 53 is also arranged on the rotating plate 52, and the servo electric cylinder 53 is used to drive the second flaw detection head 55 to move up and down, which can cooperate with the detection of the shoulder positions at different heights caused by different shaft diameters, and the detection is more comprehensive and convenient.

[0026] The first flaw detector 4 and the second flaw detector 5 adopt ultrasonic flaw detection probes or eddy current flaw detection probes. By adopting ultrasonic flaw detection probes or eddy current flaw detection probes, there is no need to directly contact the object to be detected, avoiding damage and realizing non-destructive detection.

[0027] Inside the fixed seat 2 where the first motor 22 is installed, there is a cooling fan 23, and on the surface of the fixed seat 2 where the first motor 22 is installed, there are cooling holes 24. The arranged cooling fan 23 and cooling holes 24 dissipate heat from the inside of the fixed seat 2 efficiently and quickly, avoiding heat accumulation in the fixed seat 2 and affecting the normal operation of the first motor 22.

[0028] The parts not detailed in the present utility model are the prior art, so they will not be specifically elaborated here.

Claims

1. A machine tool flaw detection mechanism for detecting the surface quality of a steam turbine shaft, characterized in that: It includes a base (1). Fixed seats (2) are provided on both sides of the base (1). A fixed head (21) for fixing a rotating shaft (6) is provided on the fixed seat (2). At least one fixed seat (2) is internally provided with a first motor (22) for driving the fixed head (21) to rotate; a support (31) is provided above the fixed seat (2). A linear module (32) is provided between the two supports (31). A mounting plate (33) is provided on the slide plate of the linear module (32). A first flaw detector (4) for detecting the circumferential surface of the rotating shaft (6) and a second flaw detector (5) for detecting the side surface of the shaft shoulder of the rotating shaft (6) are provided on the mounting plate (33).

2. The machine tool flaw detection mechanism for detecting the surface quality of the steam turbine shaft according to claim 1, wherein: The first flaw detector (4) includes a mounting ring (41) sleeved outside the rotating shaft (6). A number of first flaw detection heads (42) for inward detection are provided on the inner ring surface of the mounting ring (41). The mounting ring (41) is fixedly connected to the mounting plate (33) through a connecting plate (43).

3. The machine tool flaw detection mechanism for detecting the surface quality of the steam turbine shaft according to claim 2, characterized in that: A slide rail (11) is provided on the base (1) between the two fixed seats (2). A slider (44) slidably connected to the slide rail (11) is provided at the bottom of the mounting ring (41).

4. The machine tool flaw detection mechanism for detecting the surface quality of the steam turbine rotating shaft according to claim 1, characterized in that: The second flaw detector (5) includes a second motor (51) fixed on the mounting plate (33). A rotating plate (52) is provided on the output shaft of the second motor (51). A servo electric cylinder (53) is provided on the rotating plate (52). A mounting rod (54) is provided on the servo electric cylinder (53). A second flaw detection head (55) is provided on one side of the mounting rod (54).

5. The machine tool flaw detection mechanism for detecting the surface quality of the steam turbine rotating shaft according to claim 1, characterized in that: The first flaw detector (4) and the second flaw detector (5) adopt ultrasonic flaw detection probes or eddy current flaw detection probes.

6. The machine tool flaw detection mechanism for detecting the surface quality of the steam turbine shaft according to claim 1, wherein: A cooling fan (23) is provided inside the fixed seat (2) where the first motor (22) is installed. Cooling holes (24) are provided on the surface of the fixed seat (2) where the first motor (22) is installed.

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