JPS6116508Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a fracture behavior testing device for a rotating body, which is equipped with an imaging device for understanding the fracture behavior of a high-speed rotating body such as a turbine disk. [Prior art] When an object rotating at high speed, such as a turbine disk, breaks, how do the fragments behave?
Accurately understanding the type of damage caused to the turbine casing and building is important for improving plant safety and reliability. However, in order to understand the behavior of fragments when a disk rotating at high speed breaks, it is necessary to continuously photograph this situation using a high-speed camera. Conventionally, Japanese Patent Publication No. 52-21903 is known as a device for destroying test rotating bodies such as grindstones. This device is capable of destroying test rotating bodies at any circumferential speed without using explosives such as dynamite, and its gist is as follows:
An operating ring having a tapered surface is slidably fitted into a sleeve that grips the test rotating body, a destroyer is interposed between the tapered surface and the inner peripheral surface of the test rotating body, and the operating ring is The test rotating body was destroyed by sliding the destroyer under pressure in the direction in which it was pushed outward. [Problems to be Solved by the Invention] However, according to the conventional technology, there is a risk that the fragments of the destroyed test rotating body will be scattered and destroy the high-speed camera. For this reason, conventionally it has not been possible to continuously monitor the behavior of debris using a high-speed camera. The present invention was developed in view of the above circumstances, and its purpose is to be able to accurately photograph the behavior of the test specimen using a photographing device, and to prevent the photographing device from being damaged by fragments of the rotating body. The purpose of the present invention is to provide a device for testing the destructive behavior of rotating bodies. Here, we will specifically discuss the latter purpose. In other words, fragments are scattered due to the destruction of the rotating body, but this is detected by blocking the laser beams from the many laser light sources installed, and the flash device of the imaging device is activated to emit flash light and capture the image. will be done. At the same time, a signal is transmitted from the driving source of the shielding plate (with a delay on the order of microseconds) to close the shielding plate. One of the purposes of the present invention is to prevent the imaging device from being damaged by debris of the rotating body. [Means for Solving the Problems] The present invention includes a laser light source that emits a laser beam near a rotating body, a system that receives the laser beam from the laser source, and a system that detects the laser beam when the optical axis of the beam is interrupted. a light-receiving sensor that senses and emits a sensing signal; a photographing device that is placed directly below the rotating body and takes an image of the rotating body; and a photographing device that is placed between the rotating body and the photographing device that detects the The invention is characterized by a protective body having a shielding plate that opens and closes, so that the behavior of the rotating body can be accurately photographed by the photographing device, and the photographing device is prevented from being damaged by fragments of the rotating body, etc. It is ivy. [Operation] According to the present invention, by arranging the photographing device directly under the rotating body, the behavior of the rotating body can be accurately photographed. A light-receiving sensor that receives a laser beam from a laser light source and senses when the optical axis of the beam is interrupted and emits a sensing signal, and a protective body that has a shielding plate that opens and closes based on the sensing signal. Therefore, it is possible to prevent the photographing device from being damaged by fragments of the rotating body. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1 in the figure is a test object (rotating body) such as a disk of a turbine, for example. This test specimen 1 is rotated at high speed by a motor 3 attached to a support member 2. This support member 2 has a cylindrical casing 4 at its lower part and a transparent plate 5 made of synthetic resin at its lower end to form an airtight chamber 6 in which the test specimen 1 is accommodated, and this airtight chamber 6 is kept under vacuum. By doing so, the air resistance caused by the rotation of the test object 1 is eliminated, and the test object 1 is made to easily rotate at high speed. Note that the support member 2 is provided on an earth tank 7 filled with sand. Immediately below the test specimen 1, a photographing device 8, such as a high-speed camera, is arranged. Here, the imaging device 8 such as the high-speed camera does not start driving in response to something, but is driven from the beginning. That is, for example, the film of the above-mentioned high-speed camera is attached from the beginning to a rotating drum that rotates at a constant speed, and it emits light in accordance with the flash light emission. In addition, unevenness in the interval between photographed frames due to the start of driving of the high-speed camera is prevented from occurring. The photographic field of view of this photographing device 8 is directed upward, and sufficiently covers the test specimen 1 and the casing 4. The specifications of this high-speed camera are as shown in the following table, for example.

[Effect of idea]

As explained above, according to the present invention, it is possible to take pictures using a rotating object imaging device, and it can also be protected from debris, so it is extremely effective as a device for preventing damage to imaging devices for destructive tests. .

[Brief explanation of the drawing]

The drawing is an explanatory diagram of a rotating body destructive behavior testing device. 1...Test object (rotating body), 8...Photographing device, 9
...Flash device, 10...Detection optical path, 11...
...protection device, 12 ... protection body, 13 ... laser light source, 14 ... light receiving sensor, 17 ... shielding plate.

Claims (1)

[Scope of utility model registration request] a laser light source that emits a laser beam in the vicinity of the rotating body; a light receiving sensor that receives the laser beam from the laser light source and also senses when the optical axis of the beam is interrupted and issues a sensing signal; The object includes: a photographing device disposed directly below the body to image the rotating body; and a protective body having a shielding plate disposed between the rotating body and the photographing device and opened and closed based on a sensing signal from the light receiving sensor. A fracture behavior testing device for rotating bodies characterized by: