JP2017009424A - Target holding jig, measurement device, and target holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a target holding jig and a measurement device to bring a target into contact with a to-be-measured object with high precision by simple operation.SOLUTION: A target holding jig for holding a target provided with a reflection mechanism reflecting measurement light emitted from a light source, and bringing the target into contact with an end surface of a to-be-measured object formed from a material that can be magnetically attracted by a magnet, comprises: a support part supporting the target in a state of bringing the target into contact with the to-be-measured object; a guide part disposed on a side, opposite to the to-be-measured object, of the support part, and guiding the target to a position at which the target contacts the to-be-measured object in a short side direction of the end surface of the to-be-measured object; and a connection part fixed to the guide part and having the magnet that can magnetically attract the to-be-measured object.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a target holding jig, a measuring apparatus, and a target holding method for holding a target that contacts a measurement object.

  As a measuring device that measures the distance to a measurement object, there is a device that performs measurement using measurement light. For example, Patent Literature 1 receives a light source that outputs a radiated light beam (measurement light), a target that includes an external retroreflector that reflects the measurement light, and light that is fixed integrally with the light source and reflected from the target. An absolute distance meter having a light receiving unit and a signal processing device that analyzes the light received by the light receiving unit and calculates the distance to the target is described. The absolute distance meter irradiates the target with measurement light from the light source while the target is in contact with the measurement object, receives the light reflected by the target at the light receiving unit, analyzes the received light, By calculating the distance, the distance to the measurement object in contact with the target can be measured.

  In Patent Document 2, as a jig for holding a spherical reflector (target) used for measuring a bending angle of a rod-like work (pipe) such as a cylinder or a column, an outer part that holds the spherical reflector in a slidable manner is disclosed. There is described a jig that includes a pair of semicircular jig structures having orientation grooves formed therein, and that the pair of semicircular jig structures are combined and fitted to the outer periphery of a pipe. In Patent Document 2, in addition to being able to easily measure the bending angle of the bar-shaped workpiece by moving the target along this jig, the bending angle for each measurement part of the bar-shaped workpiece is recorded. Is going to be possible.

  When measuring the distance to the measurement object using an apparatus as described in Patent Document 1, if the target is not in contact with the measurement object, the distance from the measurement object or the bending angle of the measurement site Cannot be measured accurately.

  Here, a plate-like member such as a seal fin of a steam turbine may be a measurement object. When measuring the end face of a plate-like member such as a seal fin, the object to be measured becomes thinner, unlike a rod-like workpiece such as a cylinder or a column. Since the target is spherical, when the target is brought into contact with the measurement object or moved along the measurement object, the contact position of the target is easily shifted in the thickness direction (plate thickness direction) of the measurement object. . Thus, when the contact position of the target shifts, the plate-shaped measurement object comes in contact with a direction shifted from the normal line toward the center of the spherical target, resulting in a measurement error.

  Therefore, the target holding jig described in Patent Document 3 is configured to bring the target into contact with the measurement object with high accuracy. This target holding jig is a target holding jig that holds a target including a reflection mechanism that reflects measurement light emitted from a light source, and that makes the target come into contact with the end surface of the measurement object. A support unit that supports the target in a state, and is disposed on the side of the support unit that faces the measurement object, and regulates the position where the target contacts the measurement object in the short side direction of the end surface of the measurement object; The guide part which controls the movement to the short side direction of the end surface of this measuring object is provided, and the connection part fixed to a support part and connected with a measuring object so that attachment or detachment is possible.

JP 2011-39052 A JP 2012-137382 A Japanese Patent No. 5627719

  In the target holding jig described in Patent Document 3, the connecting portion is a mechanism similar to a so-called clothespin that is connected to the measurement object by sandwiching the measurement object. The sandwiching type connecting portions are provided on both sides of the target and the guide portion with respect to the support portion that supports the target. Such a sandwiching type connecting portion may be slippery when the one side of the tip of the measurement object to be sandwiched is formed in a tapered shape. In addition, since there is a play in the clamping operation of the clamping type connecting portion, it takes time until the measuring object is sandwiched while being guided by the guide portion and the hand can be released. In addition, since the sandwiching type connecting portion is provided on both sides, it is necessary to operate with both hands. As described above, the target holding jig described in Patent Document 3 can bring the target into contact with the measurement object with high accuracy, but it is necessary to improve operability. In Patent Document 3, it is shown that the connecting portion may be a mechanism such as a magnet that is connected to an object to be measured by adsorption. However, if the holding-type connecting portion is simply replaced with a magnet, it is notable. It is difficult to improve operability.

  This invention solves the subject mentioned above, and aims at providing the target holding jig and measuring apparatus which can contact a target with a measurement object with high precision by easy operation, and a target holding method. .

  The target holding jig of the present invention for achieving the above object holds a target having a reflection mechanism that reflects measurement light emitted from a light source, and the target and magnet are formed of a material that can be magnetically attracted. A target holding jig for contacting an end surface of an object, the support unit supporting the target in a state of contact with the measurement object, and a side of the support part facing the measurement object; A guide part for guiding a position where the target contacts the measurement object in the short side direction of the end face of the measurement object, and a connecting part having a magnet fixed to the guide part and capable of being magnetically attracted to the measurement object And.

  Therefore, the magnet of the connecting part is connected to the measurement object by magnetic attraction, and the relative position between the target and the measurement object is regulated by the guide part, so that the target can be brought into contact with the measurement object with high accuracy. . Moreover, one target holding jig and a target can be used for the measurement of several points by connecting with a measuring object in the state in which a connection part is removable with a magnet. In particular, since the connecting portion is configured to magnetically attract to the measurement object, the connection to the measurement object can be easily performed. And since the connection part is arrange | positioned at the guide part which guides the position where a target contacts a measuring object, it can guide the position where a target contacts a measuring object by magnetic adsorption.

  In the target holding jig of the present invention, the magnet has a flat surface along a side surface that is a surface extending in a direction orthogonal to the end surface and an extending direction of the end surface of the measurement object, It is characterized in that it can be magnetically adsorbed on the side surface.

  Therefore, by magnetically attracting the flat surface of the magnet to the side surface of the measurement object, it is easy to connect the connecting part to the measurement object, and high magnetic adsorption force is ensured by magnetic adsorption between the surfaces. can do.

  In the target holding jig of the present invention, the magnet has a flat surface extending along only one side surface that is an extending direction of the end surface of the measurement object and a surface extending in a direction orthogonal to the end surface, It is possible to magnetically attract only to the one side surface of the measurement object.

  Therefore, magnetic adsorption to the measurement object can be easily performed, and it is easy to remove from the measurement object. Thereby, attachment / detachment with respect to a measuring object can be performed easily.

  In the target holding jig of the present invention, the magnet has a flat surface along a side surface that is a surface extending in the extending direction of the end surface of the measurement object and a direction orthogonal to the end surface, and the flat surface is In the short direction of the end face of the measurement object, the measurement object is separated from the position of the contact portion of the target that contacts the measurement object by the dimension of the measurement object.

  Therefore, since the contact portion of the target is arranged with respect to the measurement object by magnetically attracting the flat surface of the magnet to the measurement object, the contact portion of the target is easily and high with respect to the measurement object. Can be contacted with accuracy.

  In the target holding jig of the present invention, the guide portion has two guide surfaces sandwiching two side surfaces which are surfaces extending in an extending direction of the end surface of the measurement object and a direction orthogonal to the end surface, A contact portion of the target that contacts an end surface of the measurement object is disposed between the guide surfaces.

  Therefore, the contact of the contact portion of the target with respect to the end surface of the measurement object can be guided by inserting the end surface of the measurement object between the opposing guide portions.

  In the target holding jig of the present invention, the connecting portion is disposed only between one guide portion between the guide surfaces of the guide portion.

  Therefore, the other guide portion without the connecting portion restricts the magnetic object from being shaken due to insufficient magnetic adsorption when the connecting portion of the one guide portion is magnetically attracted to the measuring object. Thereby, the magnetic attraction | suction state with respect to a measuring object can be ensured, guiding the contact of the contact part of the target with respect to the end surface of a measuring object.

  In the target holding jig of the present invention, the guide portion is provided so as to be movable so that one of the guide surfaces approaches or separates from the other.

  Therefore, the position of the guide part can be adjusted according to the dimension of the measurement object, and the accuracy of guiding the position where the target contacts the measurement object can be improved, or the position where the connecting part magnetically attracts the measurement object. Accuracy can be improved.

  In the target holding jig of the present invention, the guide portion has a guide surface along a side surface that is a surface extending in a direction orthogonal to the end direction and the extending direction of the end surface of the measurement object, and the connecting portion is The magnet is fixed to the guide surfaces at respective positions on both sides of the target in the long side direction of the end surface of the measurement object.

  Therefore, the respective connecting portions are magnetically attracted and connected to the side surfaces of the measurement object on both sides of the target, so that the target can be brought into contact with the measurement object in a stable connection state.

  In the target holding jig of the present invention, the magnet is a neodymium permanent magnet.

  Therefore, a strong magnetic adsorption state can be secured stably.

  In the target holding jig of the present invention, a detection unit that detects that the target and the measurement object are in contact with each other, and a notification that the detection unit has detected contact between the target and the measurement object. And a notification unit.

  Therefore, the target can be brought into contact with the measurement object more reliably, and the measurement accuracy can be further increased.

  In the target holding jig of the present invention, the detection unit includes a power source connected to the target and the connection unit, and the target, the connection unit, the power source, and the notification unit are connected in series, and the target And when the said connection part contacts the said measurement object, the said target, the said connection part, the said power supply, the said alerting | reporting part, and the said measurement object become a closed circuit, It is characterized by the above-mentioned.

  Therefore, it is possible to know whether or not the target has come into contact with the measurement object simply by adjusting the position while contacting the connecting portion in order to connect the target holding jig to the measurement object.

  In the target holding jig according to the present invention, the guide portion is disposed between the support portion and the connection portion, and includes an insulating portion that insulates the support portion and the connection portion.

  Therefore, it can prevent that a connection part and a target are electrically connected by parts other than a circuit by this.

  In the target holding jig of the present invention, the notification unit is a light emitting unit that emits light.

  Therefore, it can be easily understood visually whether the target and the measurement object are in contact with each other.

  In the target holding jig of the present invention, the measurement object is an annular seal fin in a steam turbine.

  Therefore, when the measurement object is a seal fin, it is necessary to measure a large number of positions, but by using a detachable target holding jig, the target is placed on the measurement object and moved for measurement. Measurement can be performed with a small number of targets.

  The measuring apparatus of the present invention receives the target holding jig according to any one of the above, a target held by the target holding jig, a light source for irradiating the target with measuring light, and the measuring light reflected by the target. And a measuring device main body including a processing unit for analyzing a result received by the light receiving unit.

  Therefore, since the target and the measurement object can be contacted with high accuracy, that is, positional deviation can be suppressed, the distance to the measurement object can be measured with high accuracy.

  In the target holding method of the present invention, a target having a reflection mechanism that reflects measurement light emitted from a light source is held, and the target and an end surface of a measurement object formed of a material capable of magnetically attracting the target are brought into contact with each other. A method for holding a target, comprising: a support part that supports the target in contact with the measurement object; and a support unit that is disposed on a side of the support part that faces the measurement object, and has a short end face of the measurement object. A guide unit that guides a position where the target contacts the measurement object in a side direction; and a coupling unit that is fixed to the guide unit and includes a magnet that can be magnetically attracted to the measurement object. And a guide step of guiding the position where the target contacts the measurement object by the guide unit, and the target is the measurement pair. Characterized in that it comprises a connecting step of connecting by magnetic attraction to the measurement target the magnet at a position in contact with the object, the.

  Therefore, the magnet of the connecting part is connected to the measurement object by magnetic attraction, and the relative position between the target and the measurement object is regulated by the guide part, so that the target can be brought into contact with the measurement object with high accuracy. . Moreover, one target holding jig and a target can be used for the measurement of several points by connecting with a measuring object in the state in which a connection part is removable with a magnet. In particular, since the connecting portion is configured to magnetically attract to the measurement object, the connection to the measurement object can be easily performed. And since the connection part is arrange | positioned at the guide part which guides the position where a target contacts a measuring object, it can guide the position where a target contacts a measuring object by magnetic adsorption.

  In the target holding method of the present invention, the magnet of the target holding jig has a flat surface along a side surface that is a surface extending in a direction perpendicular to the end surface and an extending direction of the end surface of the measurement object. In the connecting step, the flat surface of the magnet is magnetically attracted to a side surface of the measurement object.

  Accordingly, the connecting portion can be easily connected to the measurement object, and a high magnetic attraction force can be ensured by magnetic attraction between the surfaces.

  In the target holding method of the present invention, a flat surface that extends along only one side surface, which is a surface in which the magnet of the target holding jig extends in the direction in which the end surface of the measurement object extends and the direction perpendicular to the end surface, extends. And in the connecting step, the flat surface of the magnet is magnetically attracted only to one side surface of the measurement object.

  Therefore, the magnetic adsorption to the measurement object can be easily performed, and the magnetic adsorption from the measurement object can be easily removed, so that the measurement object can be easily attached and detached.

  In the target holding method of the present invention, the two guide surfaces sandwiching the two side surfaces, which are the surfaces of the target holding jig extending in the direction perpendicular to the end surface and the extending direction of the end surface of the measurement object, are provided. A contact portion of the target that is in contact with an end surface of the measurement object is disposed between the guide surfaces, and one of the contact portions is provided so as to be movable toward or away from the other, the guiding step Then, it guides after moving the said guide part according to the dimension of the said measurement object.

  Therefore, since the distance between the opposing guide portions is adjusted according to the size of the measurement object, the accuracy of guiding the position where the target contacts the measurement object can be improved, and the connecting portion can be magnetically attracted to the measurement object. The accuracy of the position to be performed can be improved.

  In the target holding method of the present invention, the target holding jig detects a contact between the target and the measurement object, and the detection unit detects contact between the target and the measurement object. A notifying unit for notifying the detection, and in the connecting step, the connection is completed when there is a notification by the notifying unit.

  Therefore, it is possible to make the user recognize that the target and the measurement object are in contact with each other and improve workability.

  In the target holding method of the present invention, the measurement object is an annular seal fin in a steam turbine.

  Therefore, when the measurement object is a seal fin, it is necessary to measure a large number of positions, but by using a detachable target holding jig, the target is placed on the measurement object and moved for measurement. Measurement can be performed with a small number of targets.

  According to the target holding jig and the measuring apparatus of the present invention, the measurement object such as a plate-like member such as a seal fin of the steam turbine and the connection part are connected by magnetic adsorption, and the target and the measurement object are relative to each other in the guide part. By regulating the position, the target can be brought into contact with a measurement object that is a plate-like member such as a seal fin of a steam turbine with high accuracy by an easy operation.

FIG. 1 is a front view showing a schematic configuration of a target holding jig according to an embodiment of the present invention. FIG. 2 is a top view of the target holding jig shown in FIG. FIG. 3 is a bottom view of the target holding jig shown in FIG. FIG. 4 is a cross-sectional view showing a schematic configuration viewed from the line AA in FIG. FIG. 5 is a cross-sectional view showing a schematic configuration viewed from the line BB in FIG. FIG. 6 is a schematic diagram illustrating a circuit configuration of the detection unit. FIG. 7 is a schematic diagram illustrating a schematic configuration of a measurement apparatus including a target holding jig. FIG. 8 is a perspective view showing a schematic configuration of the measurement object. FIG. 9 is a schematic diagram showing a positional relationship between the measurement object and the target holding jig during measurement.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. For example, in the embodiments described below, the target holding jig and the measuring device of the present invention will be described by taking an example of measuring the end surface on the inner peripheral side of the ring-shaped seal fin of the steam turbine. The magnet is not limited to this as long as it is made of a magnetically attractable material (including a magnetic material). The target holding jig and the measuring device of the present invention can obtain a more remarkable effect when the seal fin is used as a measurement object. However, as with the seal fin, the position of the end face of the thin plate-like measurement object is measured. In this case, it can be suitably used.

  FIG. 1 is a front view showing a schematic configuration of a target holding jig according to an embodiment of the present invention. FIG. 2 is a top view of the target holding jig shown in FIG. FIG. 3 is a bottom view of the target holding jig shown in FIG. FIG. 4 is a cross-sectional view showing a schematic configuration viewed from the line AA in FIG. FIG. 5 is a cross-sectional view showing a schematic configuration viewed from the line BB in FIG. FIG. 6 is a schematic diagram illustrating a circuit configuration of the detection unit.

  The target holding jig 10 holds the target 8 and is detachably connected to the measurement object 50. Here, the target 8 is a part of a measuring apparatus described later, and includes a reflection mechanism that reflects measurement light. Specifically, the target 8 is a substantially spherical member partially formed with a notch, and a reflector that reflects measurement light is provided in the notch. The measurement object 50 of the present embodiment is a ring-shaped seal fin of a steam turbine (hereinafter, the measurement object 50 is also referred to as a seal fin 50).

  The target holding jig 10 includes a support part 14, a connection part 15, a guide part 20, a battery folder 22, a light emitting part 24, a wiring 26, and a wiring 28.

  The support portion 14 is a member that becomes a base of the target holding jig 10. As shown in FIGS. 1 to 5, the support portion 14 includes a first support portion 14A and a second support portion 14B. Each of the first support portion 14A and the second support portion 14B is a plate-like member, and is connected by a screw 14D via a spacer 14C having a predetermined interval between the inner surfaces having the largest areas facing each other. ing. In the first support portion 14A, an opening portion 14Aa penetrating the inner and outer surfaces having the largest area is formed. Further, the second support portion 14B is formed with an opening 14Ba penetrating the inner and outer surfaces having the largest area. The openings 14Aa and 14Ba are provided so as to face each other and have an inner diameter slightly smaller than the diameter of the target 8. Then, by inserting the target 8 into each opening 14Aa, 14Ba, the target 8 places its center C between the first support part 14A and the second support part 14B, and the first support part 14A and the second support part 14B. It is held by the target holding jig 10 by being sandwiched between the support portions 14B and being held at predetermined positions in the openings 14Aa and 14Ba. 2 and 3, the openings 14 </ b> Aa and 14 </ b> Ba are shown as rectangular shapes, but may be circular, for example, and the shape is not limited as long as it has an inner diameter smaller than the diameter of the target 8. Moreover, 14 A of 1st support parts are connected with opening part 14 Aa, and the notch 14Ab extended to the side surface of 14 A of 1st support parts is formed. By providing this notch 14Ab, it is possible to secure a region where the measurement light enters and reflects on the target 8. Also for the user, since the notch 14Ab is formed, the relative position between the target 8 and the measurement object 50 can be easily confirmed through the notch 14Ab. In the second support portion 14B, the outer surface having the largest area is a surface facing the end surface 50a of the measurement object 50 when facing the measurement object (seal fin) 50 as shown in FIG. .

  As shown in FIG. 1, when the first support portion 14 </ b> A is connected to the measurement object 50, the battery folder 22 and the light emitting unit 24 are arranged on the outer surface opposite to the measurement object 50. In addition, a wiring 26 and a wiring 28 are arranged in association with the battery folder 22 and the light emitting unit 24. Moreover, the guide part 20 is arrange | positioned at the 2nd support part 14B.

  As shown in FIG. 1, the guide part 20 is arrange | positioned in the outer surface which faces the end surface 50a of the measuring object 50 in the 2nd support part 14B. The guide part 20 includes a first guide part 20A and a second guide part 20B. As shown in FIG. 3 to FIG. 5, the first guide portion 20 </ b> A and the second guide portion 20 </ b> B are arranged with the top portion 8 a of the target 8 that protrudes most from the opening portion 14 </ b> Ba on the outer surface of the second support portion 14 </ b> B. It is provided facing. The top 8 a of the target 8 is a contact portion that contacts the end surface 50 a of the measurement object 50. The first guide portion 20A and the second guide portion 20B are provided with flat guide surfaces 20Aa and 20Ba facing each other with the top portion 8a of the target 8 therebetween. Each guide surface 20Aa, 20Ba is provided along the longitudinal direction in which the measurement object 50 extends, as shown in FIG. And the groove | channel 21 which put the top part 8a of the target 8 is formed between each guide surface 20Aa and 20Ba. Further, as shown in FIGS. 1 and 4, the first guide portion 20 </ b> A and the second guide portion 20 </ b> B have an opening hole 20 </ b> Ab for inserting a part of the target 8 protruding from the opening portion 14 </ b> Ba of the second support portion 14 </ b> B, 20Bb is formed. The opening holes 20Ab and 20Bb prevent the first guide part 20A and the second guide part 20B from interfering with the target 8.

  The first guide portion 20 </ b> A is provided with a guide surface 20 </ b> Aa extending to both sides of the target 8 with the target 8 placed at a substantially central portion. The first guide portion 20A has a fixed piece 20Ac that is bent perpendicular to the guide surface 20Aa, and the fixed piece 20Ac is fixed to the second support portion 14B by a screw 20Ad. In the first guide portion 20 </ b> A fixed to the second support portion 14 </ b> B, the guide surface 20 </ b> Aa is along the one side surface 50 b of the measurement object 50. Further, as shown in FIGS. 1, 4 and 5, the first guide portion 20 </ b> A is located at a position protruding from the second support portion 14 </ b> B rather than the protruding height of the top portion 8 a of the target 8 protruding from the second support portion 14 </ b> B. A guide surface 20Aa is disposed. The side surface 50b of the measuring object 50 is a surface extending in the extending direction of the end surface 50a of the measuring object 50 and the direction orthogonal to the end surface 50a.

  The second guide portion 20B is formed such that the guide surface 20Ba is smaller than the guide surface 20Aa of the first guide portion 20A. The second guide portion 20B has a fixing piece 20Bc that bends perpendicularly to the guide surface 20Ba, and the fixing piece 20Bc is fixed to the second support portion 14B by screws 20Bd. In the second guide portion 20B fixed to the second support portion 14B, the guide surface 20Ba is along the other side surface 50b of the measurement object 50. Further, the second guide portion 20B is formed as a long hole 20Be in which a hole into which the screw 20Bd is inserted is formed in a longitudinal shape in a direction toward the first guide portion 20A. Therefore, the second guide portion 20B is provided so that the guide surface 20Ba can move toward or away from the guide surface 20Aa of the first guide portion 20A by loosening the screw 20Bd. That is, the guide part 20 is provided so that the space | interval of the groove | channel 21 between flat guide surface 20Aa and 20Ba which opposes on both sides of the top part 8a of the target 8 can be narrowed or expanded. Further, as shown in FIGS. 1, 4 and 5, the second guide portion 20 </ b> B is located at a position protruding from the second support portion 14 </ b> B rather than the protruding height of the top portion 8 a of the target 8 protruding from the second support portion 14 </ b> B. A guide surface 20Ba is arranged.

  The connecting portion 15 includes a magnet 16 and a magnet 18. The magnet 16 and the magnet 18 are coupled so as to be magnetically attractable to a measurement object 50 made of a material (including a magnetic body) on which the magnet can be magnetically attracted. As shown in FIG. 1, in the target holding jig 10, the magnet 16 and the magnet 18 are arranged on the guide surface 20 </ b> Aa of the first guide portion 20 </ b> A in the guide portion 20. Specifically, the magnet 16 and the magnet 18 are in the long side direction of the end surface 50a of the measurement object 50 in the guide surface 20Aa provided to extend to both sides of the target 8 along the side surface 50b of the measurement object 50. A magnet 16 is disposed on one side of the target 8 and a magnet 18 is disposed on the other side of the target 8. That is, the magnet 16 and the magnet 18 serving as the connecting portion 15 are located on both sides of the target 8 in the long side direction of the end surface 50a of the measurement object 50 with respect to the guide surface 20Aa of the first guide portion 20A in the guide portion 20. Has been placed.

  As described above, the magnet 16 and the magnet 18 provided in the first guide portion 20A of the guide portion 20 can be magnetically attracted to the measurement object 50 made of a material (including a magnetic body) that the magnet can magnetically attract. Connect to Specifically, the magnet 16 and the magnet 18 are plate-shaped magnets, and particularly neodymium-based permanent magnets. The magnet 16 and the magnet 18 which are plate-shaped magnets have flat surfaces 16 a and 18 a facing the side surface 50 b of the measurement target 50. In other words, the magnets 16 and 18 are connected by the flat surfaces 16 a and 18 a being magnetically attracted to the side surface 50 b of the measurement object 50. Further, as shown in FIGS. 1, 4 and 5, the magnets 16 and 18 have flat surfaces 16a and 18a at positions projecting from the projecting height of the top 8a of the target 8 projecting from the second support 14B. Has been placed.

  Although not explicitly shown in the drawing, only one of the magnets 16 and 18 may be disposed on the guide surface 20Aa of the first guide portion 20A of the guide portion 20. Moreover, the magnets 16 and 18 may be permanent magnets other than the neodymium system. The magnets 16 and 18 are not limited to permanent magnets but may be electromagnets. Further, the magnets 16 and 18 may be disposed on the guide surface 20Ba of the second guide portion 20B in the guide portion 20, or may be disposed only on the guide surface 20Ba of the second guide portion 20B.

  The guide part 20 in which the magnets 16 and 18 are arranged is configured as an insulating part. That is, the magnets 16 and 18 are fixed to the support part 14 via the guide part 20 which is an insulating part. Since the insulating portion is arranged at the fixed portion between the magnets 16 and 18 and the support portion 14, no electricity flows. Although not explicitly shown in the figure, the guide portion 20 is not configured as an insulating portion, and an insulating portion is disposed between the guide portion 20 and the magnets 16 and 18, or the guide portion 20 and the support portion 14 (second support). An insulating portion may be arranged between the portion 14B).

  As shown in FIGS. 4 and 5, when the magnets 16 and 18 are magnetically attracted and connected to the side surface 50 b of the measurement object 50, the target 8 is measured at or near the top (contact portion) 8 a of the target 8. The object 50 can be brought into contact with the end surface 50a. Accordingly, the magnets 16 and 18 bring the apex (contact portion) 8a of the target 8 or the vicinity thereof into contact with the end surface 50a of the measurement object 50, so that the dimension (thickness) of the measurement object 50 is taken into consideration. Flat surfaces 16a and 18a are arranged at positions away from the apex (contact portion) 8a by the size of the measurement object 50, and are provided on the first guide portion 20A. For this reason, the target 8 is held in a direction in which the measurement light can be incident and reflected in a state where the magnets 16 and 18 are magnetically attracted to the side surface 50 b of the measurement object 50 and are in contact with the measurement object 50.

  The battery folder 22 is installed on the first support portion 14A of the support portion 14, and a battery (not shown) is attached. In the battery folder 22, one electrode is electrically connected to the support portion 14 and the other electrode is connected to the wiring 26. The light emitting part 24 is installed on the first support part 14 </ b> A of the support part 14. The light emitting unit 24 is a light emitting diode or the like, and is an element that emits light when a current flows. The wiring 26 connects the other electrode of the battery folder 22 and the light emitting unit 24. The wiring 28 connects the light emitting unit 24 and the connecting unit 15 (which may be the magnet 16 or the magnet 18).

  Moreover, the support part 14 (1st support part 14A, 2nd support part 14B, spacer 14C) is produced with electroconductive materials, such as a metal. The support portion 14 is electrically connected to one pole of the battery folder 22 and is electrically connected to the target 8. Further, the light emitting unit 24 is electrically connected to the other pole of the battery folder 22 via the wiring 26 and is also electrically connected to the connecting portion 15 (magnet 16) via the wiring 28. Moreover, the connection part 15 (magnet 16) is electrically insulated from the support part 14 and the target 8 through the guide part 20 which is an insulation part.

  Here, in the target holding jig 10, the target 8, the support portion 14, the connecting portion 15 (magnet 16), the battery folder 22, the wiring 26, and the wiring 28 serve as the detection unit 30. The detection unit 30 forms a single series circuit including the light emitting unit 24 and the measurement object 50. Specifically, as illustrated in FIG. 6, the detection unit 30 includes a target 8, a support unit 14, a connection unit 15 (magnet 16), a battery folder 22, a wiring 26, and a wiring 28. 8, the support part 14, the battery folder 22, the wiring 26, the light emitting part 24, the wiring 28, and the connection part 15 (magnet 16) are connected in series in this order. Thereby, the detection part 30 will contact the connection part 15 (magnet 16) and the measuring object 50, and if the target 8 and the measurement object 50 are contacted, it will measure with the connection part 15 (magnet 16). The object 50 and the target 8 are connected in series to form one closed circuit. As a result, a current flows from the battery folder 22 to which the battery is attached, and light is output from the light emitting unit 24 when the current flows through the light emitting unit 24. In addition, in the detection unit 30, when any one of the connection unit 15 (magnet 16) and the target 8 is not in contact with the measurement object 50, electricity does not flow, and thus the light emitting unit 24 does not emit light.

  The target holding jig 10 is configured as described above. The target 8 is supported by the support 14 and the magnets 16 and 18 disposed in the guide 20 (first guide 20A) are magnetically attracted to the measurement target 50. Thus, the measurement object 50 can be connected. Thereby, the target holding jig 10 can regulate the position of the measuring object 50 with the guide part 20 (first guide part 20A). Specifically, the magnets 16 and 18 are magnetically attracted to the measurement object 50, whereby the position where the target 8 contacts the measurement object 50 is regulated by the guide unit 20 (first guide unit 20A), and the target The movement of the end surface 50a of the measuring object 50 in the eighth direction in the short side direction is restricted. For this reason, the contact position between the measurement object 50 and the target 8 can be set within a predetermined range, and the displacement of the contact position between the measurement object 50 and the target 8 can be reduced. Therefore, the user can perform the measurement using the target 8 with high accuracy by using the target holding jig 10 of the present embodiment. In particular, since the target holding jig 10 has a configuration in which the magnets 16 and 18 are magnetically attracted to the measurement object 50, the target holding jig 10 is connected to the measurement object 50 as compared with the sandwiching type magnet described in the invention of Patent Document 3. Can be easily performed. Moreover, since the magnets 16 and 18 are disposed in the guide unit 20 (first guide unit 20A) that guides the position where the target 8 contacts the measurement object 50, the target 8 is moved to the measurement object 50 by magnetic attraction. The contact position can be guided.

  Further, the target holding jig 10 has flat surfaces 16 a and 18 a in which the magnets 16 and 18 are along the side surface 50 b of the measurement object 50. For this reason, by magnetically attracting the flat surfaces 16a and 18a to the side surface 50b of the measurement object 50, the magnets 16 and 18 can be easily connected to the measurement object 50, and magnetic adsorption between the surfaces is possible. Therefore, a high magnetic attractive force can be secured.

  In the target holding jig 10, as shown in FIGS. 4 and 5, the magnets 16 and 18 have flat surfaces 16 a and 18 a along only one side surface 50 b of the measurement object 50. For this reason, the magnetic attraction to the measuring object 50 can be facilitated, and the magnetic attraction from the measuring object 50 can be easily removed. Thereby, attachment / detachment with respect to the measuring object 50 can be performed easily.

  Further, as shown in FIGS. 3 to 5, the target holding jig 10 has flat surfaces 16 a and 18 a in which the magnets 16 and 18 extend along the side surface 50 b of the measurement object 50, and contacts the measurement object 50. Flat surfaces 16a and 18a are arranged away from the position of the top (contact part) 8a of the target 8 by the size of the measurement object 50. For this reason, since the flat surfaces 16a and 18a of the magnets 16 and 18 are magnetically attracted to the measurement object 50, the top part (contact part) 8a of the target 8 is arranged with respect to the measurement object 50. The top portion (contact portion) 8a can be easily brought into contact with the measurement object 50 with high accuracy.

  Further, the target holding jig 10 has a first guide portion 20A and a second guide portion 20B in which the guide portion 20 sandwiches the two side surfaces 50b of the measurement object 50, and an end surface of the measurement object 50 between them. The top part (contact part) 8a of the target 8 which contacts 50a is arrange | positioned. For this reason, the contact of the top part 8a of the target 8 with respect to the end surface 50a of the measuring object 50 is guided by inserting the end face 50a of the measuring object 50 between the first guide part 20A and the second guide part 20B. Can do.

  The target holding jig 10 is provided only in the first guide portion 20A between the first guide portion 20A and the second guide portion 20B where the magnets 16 and 18 sandwich the two side surfaces 50b of the measurement object 50. ing. As a result, the second guide portion 20B restricts the magnetic object from being shaken due to insufficient magnetic adsorption when the magnets 16 and 18 of the first guide portion 20A are magnetically attracted to the measurement object 50. To do. Thereby, the magnetic adsorption state with respect to the measuring object 50 can be ensured while guiding the contact of the top 8a of the target 8 with the end surface 50a of the measuring object 50.

  Further, in the target holding jig 10, one of the first guide part 20A and the second guide part 20B (second guide part 20B in the present embodiment) sandwiching the two side surfaces 50b of the measurement object 50 is the other (in this embodiment, the second guide part 20B). The first guide portion 20A) is provided so as to be able to move toward or away from the first guide portion 20A). For this reason, the space | interval of 20 A of 1st guide parts and the 2nd guide part 20B can be adjusted. Thereby, by arranging the first guide part 20A and the second guide part 20B in accordance with the dimensions of the measurement object 50, the accuracy of guiding the position where the target 8 contacts the measurement object 50 can be improved, The accuracy of the position where the magnets 16 and 18 are magnetically attracted to the measurement object 50 can be improved.

  Further, in the target holding jig 10, the guide portion 20 (first guide portion 20 </ b> A) has a guide surface 20 </ b> Aa along the side surface 50 b of the measurement object 50, and the magnets 16 and 18 are the length of the end surface 50 a of the measurement object 50. In the side direction, it is fixed to the guide surface 20Aa at each position on both sides with the target 8 interposed therebetween. For this reason, the magnets 16 and 18 are magnetically attracted and connected to the side surface 50b of the measurement object 50 on both sides of the target 8 so that the target 8 can be brought into contact with the measurement object 50 in a stable connection state. it can.

  In the target holding jig 10, the magnets 16 and 18 are neodymium permanent magnets. For this reason, a strong magnetic adsorption state can be secured stably.

  In addition, the target holding jig 10 can determine whether the target 8 has reliably contacted the measurement object 50 by the detection unit 30. Thereby, it can suppress measuring in the state where the measuring object 50 and the target 8 are not contacting, and it becomes possible to perform the measurement using the target 8 with high precision. In addition, the target holding jig 10 is configured such that the detection unit 30 is a circuit through which a current flows when the target 8 and the coupling unit 15 (magnet 16) are in contact with the measurement object 50, so that the user can attach the target holding jig to the measurement object 50. It is possible to detect whether the target 8 and the measurement object 50 are in contact with each other only when the operation of mounting 10 is performed.

  Moreover, since the light emission part 24 as an alerting | reporting part is provided, and when the detection part 30 detects the contact with the target 8 and the measurement object 50, since an electric current will flow and the light emission part 24 will light-emit, a target 8 and measurement will be carried out visually to a user. It can be recognized that the object 50 has come into contact.

  The target holding jig 10 according to the present embodiment is not limited to light emission by causing the light emitting unit 24 to emit light and notifying the user that the target 8 and the measurement object 50 are in contact with each other. The target holding jig 10 can use various mechanisms for transmitting to the user's five senses as a notification method. For example, the target holding jig 10 may be provided with an audio output unit that emits sound instead of the light emitting unit 24.

  Further, the target holding method is arranged on the side of the support unit 14 that faces the measurement object 50 in the state where it is in contact with the measurement object 50, and the end face 50 a of the measurement object 50. The guide unit 20 guides the position where the target 8 contacts the measurement object 50 in the short side direction, and magnets 16 and 18 fixed to the guide unit 20 and coupled to the measurement object 50 so as to be magnetically attractable. Using the target holding jig 10, the guide unit 20 guides the position where the target 8 contacts the measurement object 50, and the magnets 16, 18 are moved to the measurement object 50 at the position where the target 8 contacts the measurement object 50. And a connecting step of connecting them by magnetic adsorption. Thereby, the position of the measuring object 50 can be regulated by the guide part 20 (first guide part 20A). Specifically, the magnets 16 and 18 are magnetically attracted to the measurement object 50, whereby the position where the target 8 contacts the measurement object 50 is regulated by the guide unit 20 (first guide unit 20A), and the target The movement of the end surface 50a of the measuring object 50 in the eighth direction in the short side direction is restricted. For this reason, the contact position between the measurement object 50 and the target 8 can be set within a predetermined range, and the displacement of the contact position between the measurement object 50 and the target 8 can be reduced. Therefore, the user can perform the measurement using the target 8 with high accuracy by using the target holding jig 10 of the present embodiment. In particular, since the target holding jig 10 has a configuration in which the magnets 16 and 18 are magnetically attracted to the measurement object 50, the target holding jig 10 can be attached to the measurement object 50 in comparison with the sandwiching type connecting portion described in the invention of Patent Document 3. Connection can be easily performed. Moreover, since the magnets 16 and 18 are disposed in the guide unit 20 (first guide unit 20A) that guides the position where the target 8 contacts the measurement object 50, the target 8 is moved to the measurement object 50 by magnetic attraction. The contact position can be guided.

  In the target holding method, the magnets 16 and 18 of the target holding jig 10 have flat surfaces 16a and 18a along the side surface 50b of the measurement object 50. In the connecting step, the flat surfaces of the magnets 16 and 18 are used. 16a and 18a are magnetically attracted to the side surface 50b of the measuring object 50. Thereby, it is possible to easily connect the magnets 16 and 18 to the measurement object 50, and it is possible to secure a high magnetic attraction force by magnetic attraction between the surfaces.

  In the target holding method, the magnets 16 and 18 of the target holding jig 10 have flat surfaces 16a and 18a along only one side surface 50b of the measurement object 50. In the connecting step, the magnets 16 and 18 are used. The flat surfaces 16 a and 18 a are magnetically attracted to one side surface 50 b of the measurement object 50. Thereby, the magnetic adsorption to the measurement object 50 can be easily performed, and the magnetic adsorption from the measurement object 50 can be easily removed, so that the measurement object 50 can be easily attached and detached.

  Further, the target holding method includes a first guide part 20A and a second guide part 20B in which the guide part 20 of the target holding jig 10 sandwiches the two side surfaces 50b of the measurement object 50, and the measurement object is between them. The top part (contact part) 8a of the target 8 that contacts the end face 50a of the 50 is disposed, and one of the targets 8 is provided so as to be able to move toward or away from the other. Accordingly, the guide unit 20 is moved and then guided. Thereby, since the space | interval of 20 A of 1st guide parts and the 2nd guide part 20B is adjusted according to the dimension of the measuring object 50, the precision of the guidance of the position where the target 8 contacts the measuring object 50 is improved. Or the accuracy of the position where the magnets 16 and 18 are magnetically attracted to the measurement object 50 can be improved.

  In the target holding method, the target holding jig 10 further includes a detection unit 30 and a light emitting unit (notification unit) 24. In the connection step, the connection is completed when the light emitting unit 24 reports. Thereby, a user can be made to recognize that the target 8 and the measuring object 50 contacted, and workability | operativity can be improved.

  Next, a measuring apparatus provided with the target holding jig of the present embodiment will be described with reference to FIGS. FIG. 7 is a schematic diagram illustrating a schematic configuration of a measurement apparatus including a target holding jig. FIG. 8 is a perspective view showing a schematic configuration of the measurement object. FIG. 9 is a schematic diagram showing a positional relationship between the measurement object and the target holding jig during measurement.

  As shown in FIG. 7, the measuring apparatus 80 including the target holding jig 10 includes a target 8, a target holding jig 10, and a measuring apparatus main body 82. As described above, the target 8 is held by the target holding jig 10 and is in contact with the measurement object (seal fin) 50 by the target holding jig 10 at the time of measurement.

  The measuring apparatus main body 82 includes a light source 82a, a light receiving unit 82b, and a processing unit 82c. The measuring apparatus main body 82 is provided with a head 84 and an optical system 86 that irradiate the measuring light toward the target 8 and guide the light reflected by the target 8 to the measuring apparatus main body 82. In FIG. 7, the measurement light and the reflected light are indicated by a symbol L.

  The light source 82a outputs measurement light. The light source 82a outputs, for example, laser light having a predetermined wavelength as measurement light. The light receiving unit 82b is a light receiving element that detects the reached light. The light receiving unit 82 b detects light having the wavelength of the measurement light reflected by the target 8. The processing unit 82c controls the operation of each unit of the measuring device 80. Further, the processing unit 82c measures the distance to the target 8 by analyzing the detection result of the light receiving unit 82b and the information of the measurement light output from the light source 82a, and calculates the difference caused by the shape of the target 8 The distance to the measurement target object 50 is measured by removing with.

  The head 84 is disposed in a path through which the measurement light output from the light source 82a passes, and adjusts the direction in which the measurement light is irradiated. The optical system 86 is disposed between the light source 82 a and the head 84 and between the light receiving unit 82 b and the head 84, outputs the light output from the light source 82 a toward the head 84, and enters the head 84. The light is guided to the light receiving part 82b.

  In the measuring apparatus 80, the target holding jig 10 is installed at the measurement position of the measurement object 50 in a state where the measurement light irradiated to the target 8 and received by the target 8 can be received. Here, the measurement object (seal fin) 50 of the present embodiment is installed on a seal ring 102 disposed inside the seal attachment ring 100 as shown in FIG. The seal fin 50 protrudes radially inward of the seal ring 102. A plurality of seal fins 50 are provided on the seal ring 102. Further, since the steam turbine includes a plurality of seal rings 102, the number of seal fins 50 corresponding to the number of seal rings 102 is arranged. As shown in FIG. 9, the measuring device 80 is provided with a target holding jig 10 that holds the target 8 in the circumferential direction of the seal fin 50 arranged in a ring shape, and at the center of the ring shape of the seal fin 50. A head 84 is installed, and the measuring apparatus main body 82 is connected to the head 84.

  The measurement device 80 outputs measurement light from the measurement device main body 82 to the target 8 via the head 84, and the light reflected by the target 8 via the head 84 is received by the measurement device main body 82 and received. Can be measured to measure the distance to the measurement object 50. Further, the diameter and roundness of the seal fin 50 can be measured by moving the target holding jig 10 on the seal fin 50 and measuring a plurality of positions on the seal fin 50.

  In addition, when the measurement object 50 is a seal fin as in the present embodiment, it is necessary to measure a large number of positions, but the target 8 is used as the measurement object 50 by using the detachable target holding jig 10. By performing measurement while installing and moving, it is possible to perform measurement with a small number of targets 8. In addition, the target holding jig 10 is provided with the guide portion 20, so that the target 8 can be brought into contact with the measurement object 50 with high accuracy at the time of mounting. Furthermore, since the target holding jig 10 can notify the detection unit 30 and the light emitting unit 24 that the target 8 has come into contact with the measurement object 50, the installation work of the target 8 by the user can be simplified.

8 Target 8a Top (contact part)
DESCRIPTION OF SYMBOLS 10 Target holding jig 14 Support part 14A 1st support part 14Aa Opening part 14Ab Notch 14B 2nd support part 14Ba Opening part 15 Connection part 16, 18 Magnet 16a, 18a Flat surface 14C Spacer 14D Screw 20 Guide part 20A 1st guide part 20Aa Guide surface 20Ab Opening hole 20Ac Fixing piece 20Ad Screw 20B Second guide part 20Ba Guide surface 20Bb Opening hole 20Bc Fixing piece 20Bd Screw 21 Groove 22 Battery folder 24 Light emitting part 26, 28 Wiring 50 Seal fin (measurement object)
50a End surface 50b Side surface 80 Measuring device 82 Measuring device body 82a Light source 82b Light receiving portion 82c Processing portion 84 Head 86 Optical system 100 Seal mounting ring 102 Seal ring C Center

Claims (21)

A target holding jig that holds a target having a reflection mechanism that reflects measurement light emitted from a light source, and that contacts the end surface of a measurement object that is formed of a material capable of magnetically attracting the target and a magnet,
A support part for supporting the target in a state of being in contact with the measurement object;
A guide unit that is disposed on a side of the support unit that faces the measurement object, and that guides a position where the target contacts the measurement object in a short side direction of an end surface of the measurement object;
A target holding jig, comprising: a coupling portion fixed to the guide portion and having a magnet that can be magnetically attracted to the measurement object.   The magnet has a flat surface along a side surface that is a surface extending in a direction orthogonal to the end surface and an extending direction of the end surface of the measurement object, and can be magnetically attracted to the side surface of the measurement object. The target holding jig according to claim 1.   The magnet has a flat surface extending along only one side surface that is an extending direction of the end surface of the measurement object and a direction orthogonal to the end surface, and the one side surface of the measurement object. 2. The target holding jig according to claim 1, wherein the target holding jig can be magnetically attracted only to the first electrode. The magnet has a flat surface along a side surface that is a surface extending in a direction orthogonal to the end direction and an extending direction of the end surface of the measurement object;
The flat surface is separated from the position of a contact portion of the target that contacts the measurement object by a dimension of the measurement object in a short direction of an end surface of the measurement object. The target holding jig according to any one of claims 1 to 3.   The guide portion has two guide surfaces sandwiching two side surfaces that are surfaces extending in an extending direction of the end surface of the measurement object and a direction orthogonal to the end surface, and the measurement is performed between the guide surfaces. The target holding jig according to any one of claims 1 to 4, wherein a contact portion of the target that contacts an end surface of an object is disposed.   6. The target holding jig according to claim 5, wherein the connecting portion is disposed only between one guide portion between the guide surfaces of the guide portion. 7.   The target holding jig according to claim 5 or 6, wherein the guide portion is provided so that one of the guide surfaces can move toward or away from the other. The guide portion has a guide surface along a side surface which is a surface extending in the direction perpendicular to the end surface and the extending direction of the end surface of the measurement object;
The said connection part WHEREIN: The said magnet is being fixed to the said guide surface of each position of the both sides of the said target in the long side direction of the end surface of the said measurement object, The Claim 1 to Claim 7 characterized by the above-mentioned. The target holding jig according to any one of the above.   The target holding jig according to any one of claims 1 to 8, wherein the magnet is a neodymium-based permanent magnet. A detection unit for detecting that the target and the measurement object are in contact;
The target holding according to any one of claims 1 to 9, further comprising a notification unit that notifies that the detection unit has detected contact between the target and the measurement object. Jig. The detection unit includes a power source connected to the target and the connection unit, and the target, the connection unit, the power source, and the notification unit are connected in series,
11. The circuit according to claim 10, wherein when the target and the connection part come into contact with the measurement object, the target, the connection part, the power source, the notification part, and the measurement object are closed. The target holding jig described.   The target holding jig according to claim 11, wherein the guide part is an insulating part that is disposed between the support part and the connection part and insulates the support part and the connection part.   The target holding jig according to claim 9, wherein the notification unit is a light emitting unit that emits light.   The target holding jig according to claim 1, wherein the measurement object is an annular seal fin in a steam turbine. The target holding jig according to any one of claims 1 to 14,
A target held by the target holding jig;
A measuring device main body including a light source for irradiating the target with measurement light, a light receiving unit for receiving the measurement light reflected by the target, and a processing unit for analyzing the result received by the light receiving unit; Measuring device. A target holding method of holding a target including a reflection mechanism that reflects measurement light emitted from a light source, and bringing the target and a magnet into contact with an end face of a measurement object formed of a magnetically adsorbable material,
A support part for supporting the target in a state of being in contact with the measurement object;
A guide unit that is disposed on a side of the support unit that faces the measurement object, and that guides a position where the target contacts the measurement object in a short side direction of an end surface of the measurement object;
Using a target holding jig characterized by comprising a connecting part fixed to the guide part and having a magnet that can be magnetically attracted to the measurement object,
A guide step of guiding the position where the target contacts the measurement object by the guide unit;
A coupling step of magnetically attracting and coupling the magnet to the measurement object at a position where the target is in contact with the measurement object;
A target holding method characterized by comprising: The magnet of the target holding jig has a flat surface along a side surface that is a surface extending in a direction orthogonal to the extending direction and the end surface of the end surface of the measurement object;
The target holding method according to claim 16, wherein in the connecting step, the flat surface of the magnet is magnetically attracted to a side surface of the measurement object. The magnet of the target holding jig has a flat surface extending along only one side surface which is a surface extending in a direction orthogonal to the extending direction of the end surface of the measurement object and the end surface;
The target holding method according to claim 16, wherein in the connecting step, the flat surface of the magnet is magnetically attracted to only one side surface of the measurement object. The guide portion of the target holding jig has two guide surfaces that sandwich two side surfaces that are surfaces extending in an extending direction of the end surface of the measurement object and a direction orthogonal to the end surface, and each of the guide surfaces The contact portion of the target that contacts the end surface of the measurement object is disposed between them, and one of them is provided so as to move toward or away from the other,
The target holding method according to any one of claims 16 to 18, wherein in the guiding step, the guide is moved after being moved in accordance with a dimension of the measurement object. The target holding jig includes a detection unit that detects that the target and the measurement object are in contact, and a notification unit that notifies that the detection unit has detected contact between the target and the measurement object. And,
The target holding method according to any one of claims 16 to 19, wherein in the connection step, the connection is completed when a notification is given by the notification unit.   The target holding method according to any one of claims 16 to 20, wherein the measurement object is an annular seal fin in a steam turbine.

Images