JP2016080426A - Speed measuring device and speed measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure speed of an object moving in the direction of a predetermined rotation axis while rotating around the rotation axis.SOLUTION: A speed measuring device comprises: a measurement unit for measuring magnitude of a speed component along a predetermined measurement direction, of speed of a measurement target object which is moving in a predetermined rotation axis while rotating around the rotation axis; and an arithmetic processing unit for calculating the speed of the measurement target object by using measurement data obtained by measuring the measurement target object. The measurement unit includes first and second speed meters. The first speed meter is arranged so that an angle between the measurement direction and the moving direction of the measurement target object becomes +θdegree when a rotation direction of the measurement target object is defined as a positive direction and the second speed meter is arranged so that the angle between the measurement direction and the moving direction becomes -θdegree. The first and second speed meters perform measurement at the same timing with each other.SELECTED DRAWING: Figure 3A

Description

  The present invention relates to a speed measuring device and a speed measuring method.

  The seamless steel pipe is formed by constraining a round billet with an inclined rolling roll and a disk roll, and piercing-rolling with a plug disposed on the outlet side. The billet, which is a base material, is fed into the perforated part by an inclined rolling roll, but due to various conditions such as the size of the steel pipe and the degree of deterioration of the plug, changes in the feeding speed occur. The change in the feeding speed causes a change in the drilling efficiency and affects the thickness distribution in the longitudinal direction of the steel pipe after the drilling. Therefore, it is important to accurately grasp the feed rate of the base material in the seamless steel pipe manufacturing process.

  Therefore, in Patent Document 1 below, two tip detectors are arranged apart from each other along the direction of travel of the base material, the difference in the arrival time of the base material to the two tip detectors, and the tip detector A method for detecting a representative speed of a base material based on the separation distance is disclosed.

  Patent Document 2 below discloses a method in which one non-contact type speedometer represented by a laser Doppler speedometer is disposed along the traveling direction of the base material, and the feeding speed of the base material is measured. .

Japanese Unexamined Patent Publication No. 6-11311 JP-A-7-284818 Japanese Patent No. 2557023

  However, in the method disclosed in Patent Document 1, since the representative speed is calculated using the separation distance between the tip detectors and the arrival time difference, it is possible to accurately measure the feeding speed that changes from moment to moment. Can not.

  In addition, even when the method disclosed in Patent Document 2 is used, since the base material to be measured is sent out in the traveling direction while rotating in the circumferential direction, a single unit provided along the traveling direction is provided. The measurement data output from the speedometer is superimposed on the effect of rotation. As a result, the feeding speed of the base material cannot be measured with high accuracy due to the influence of the rotation.

  Here, as disclosed in Patent Document 3, the measurement object being conveyed along a certain traveling direction is measured using two laser Doppler velocimeters, and the velocity of the measurement object is calculated. There is technology to do. However, the method disclosed in Patent Document 3 does not consider the situation where there are two types of speeds, that is, the speed in the traveling direction and the speed in the rotational direction substantially orthogonal to the traveling direction. Such a method cannot be applied to the case of measuring the speed of a measurement object conveyed while rotating in a predetermined direction. Furthermore, in the method disclosed in Patent Document 3, two laser Doppler velocimeters can be arranged uniformly in a predetermined direction so that the measurement methods in the laser Doppler velocimeters are orthogonal to each other. It is a premise. However, in an actual production line, the laser Doppler velocimeter may not be evenly arranged, so that the method disclosed in Patent Document 3 cannot be used for general purposes.

  As described above, there is still a method capable of accurately measuring the speed of the measurement object by using the object moving in the direction of the rotation axis while rotating around the predetermined rotation axis as the measurement object. It can be said that it is not.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to speed the object traveling in the direction of the rotation axis while rotating around a predetermined rotation axis. It is an object of the present invention to provide a speed measuring device and a speed measuring method capable of measuring the temperature more accurately.

In order to solve the above-described problem, according to a certain aspect of the present invention, the speed of the member to be measured is measured for the member to be measured that is rotating in the direction of the rotation axis while rotating around the predetermined rotation axis. Among them, a measurement unit for measuring the magnitude of the velocity component along a predetermined measurement direction, and an arithmetic process for calculating the velocity of the member to be measured using measurement data of the member to be measured measured by the measurement unit A first and a second speedometer for measuring a magnitude of a speed component along the predetermined measurement direction at a measurement point on the surface of the member to be measured. The first speedometer is arranged such that an angle formed by the measurement direction and the traveling direction of the member to be measured is + θ ₁ degree when the rotation direction of the member to be measured is a positive direction. And the second speed Is the angle between the traveling direction and the measurement direction are arranged such that the ₂ ° - [theta], the first speed meter and the second speedometer, implementing measures at the same timing with each other A velocity measuring device is provided.

The arithmetic processing unit, the measurement data of the first speedometer represented as V _1, the measurement data of the second speedometer when expressed as V _2, based on Equation 11 below, the measured It is preferable to calculate a velocity component V _h in the traveling direction of the member.

The arithmetic processing unit, the measurement data of the first speedometer represented as V _1, the measurement data of the second speedometer when expressed as V _2, based on Equation 13 below, the measured it may calculate the rotational direction of the velocity component V _r of the member.

In the first speedometer and the second speedometer, the angles formed by the measurement direction and the traveling direction of the member to be measured are preferably 0 deg ≦ | θ ₁ , θ ₂ | ≦ 20 deg. .

  The first and second speedometers preferably measure the same measurement point on the surface of the member to be measured at the same timing.

  The first and second speedometers may measure different measurement points on the surface of the member to be measured at the same timing.

  The first and second velocimeters are preferably laser Doppler velocimeters.

  The member to be measured may be a metal tube.

In order to solve the above-mentioned problem, according to another aspect of the present invention, a member to be measured is measured with respect to a member to be measured that is rotating in the direction of the rotation axis while rotating around a predetermined rotation axis. An angle formed by the measurement direction and the traveling direction of the member to be measured when the magnitude of the velocity component along the predetermined measurement direction at the measurement point on the surface of the surface is defined as the positive direction of the rotation direction of the member to be measured. Includes a first velocimeter arranged so that + θ is ₁ degree, and a second velocimeter arranged so that an angle between the measurement direction and the traveling direction is −θ ₂ degrees Using the measurement unit, the measurement timing of the first speedometer and the measurement timing of the second speedometer are measured to be equal to each other, and the measurement step is measured by the measurement unit Utilizing measurement data of the member to be measured It said speed measuring method comprising: speed calculation step of calculating the speed of the measuring member, is provided.

  As described above, according to the present invention, it is possible to more accurately measure the speed of an object traveling in the direction of a rotation axis while rotating around a predetermined rotation axis.

It is the schematic diagram which showed an example of the whole structure of the speed measuring device which concerns on embodiment of this invention. It is the mimetic diagram showing an example of the measurement unit which the speed measuring device concerning the embodiment has. It is the mimetic diagram showing an example of the measurement unit which the speed measuring device concerning the embodiment has. It is explanatory drawing for demonstrating the measurement unit which concerns on the same embodiment. It is explanatory drawing for demonstrating the measurement unit which concerns on the same embodiment. It is explanatory drawing for demonstrating the measurement unit which concerns on the same embodiment. It is the block diagram which showed an example of the structure of the arithmetic processing unit which the speed measuring device which concerns on the same embodiment has. It is explanatory drawing for demonstrating the speed calculation process in the arithmetic processing unit which concerns on the embodiment. It is explanatory drawing for demonstrating the speed calculation process in the arithmetic processing unit which concerns on the embodiment. It is the flowchart which showed an example of the flow of the speed measurement method which concerns on the embodiment. It is the block diagram which showed an example of the hardware constitutions of the arithmetic processing unit which concerns on the same embodiment. It is a graph for demonstrating an Example. It is a graph for demonstrating an Example. It is a graph for demonstrating an Example. It is a graph for demonstrating an Example.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(About speed measuring device)
<Overall configuration of speed measuring device>
First, an overall configuration of a speed measuring device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram schematically showing the overall configuration of a speed measuring device 10 according to the present embodiment.

  The speed measuring apparatus 10 according to the present embodiment uses a member that is traveling in the direction of the rotation shaft while rotating around a predetermined rotation shaft as the member to be measured S. That is, as schematically shown in FIG. 1, the measurement object of the speed measurement device 10 according to the present embodiment is a speed component along the traveling direction and a speed component rotating in a direction substantially orthogonal to the traveling direction. It is a member that travels while having two types of velocity components. Therefore, when attention is paid to an arbitrary point on the surface of the measurement object, the point is observed to advance in a spiral shape.

  Examples of such a member S to be measured include a tubular member that rotates in a spiral manner. Specifically, a metal tube such as a steel tube in a piercer drilling process, a pilger rolling process, or the like, There are various things such as pipes and wooden pipes.

  The speed measuring device 10 that measures the speed of the member S to be measured includes a measurement unit 100 and an arithmetic processing unit 200, as shown in FIG. The speed measuring device 10 is arranged on a line on which the member to be measured S as described above is transported, and measures the speed of the member to be measured S transported on the line.

  The measurement unit 100 is a unit that measures the magnitude of a velocity component along a predetermined measurement direction among the velocity of the member to be measured S as described above. The measurement unit 100 measures a velocity component along a predetermined measurement direction of the member to be measured S at an arbitrary timing under the control of the arithmetic processing unit 200 described later.

  The detailed configuration of the measurement unit 100 will be described in detail later.

  The arithmetic processing unit 200 controls the measurement process in the measurement unit 100 and calculates the speed of the member to be measured S using the measurement data of the member to be measured S measured by the measurement unit 100.

  The detailed configuration of the arithmetic processing unit 200 will also be described later.

  The measurement process of the surface of the member to be measured S by the measurement unit 100 and the speed calculation process by the arithmetic processing unit 200 can be performed in real time in accordance with the movement of the member to be measured S. The user of the speed measuring device 10 pays attention to the speed calculation result output from the speed measuring device 10 (more specifically, the arithmetic processing unit 200), thereby determining the speed of the member S to be measured conveyed in the line in real time. It becomes possible to grasp.

  The overall configuration of the speed measurement device 10 according to the present embodiment has been described above with reference to FIG.

<About the configuration of the measurement unit 100>
Next, the configuration of the measurement unit 100 included in the speed measurement device 10 according to the present embodiment will be described in detail with reference to FIGS. 2A to 3C. 2A and 2B are schematic diagrams illustrating an example of a measurement unit included in the speed measurement device according to the present embodiment. 3A to 3C are explanatory diagrams for explaining the measurement unit according to the present embodiment. In the following, for convenience, the description will be made with reference to the spatial coordinate system as shown in FIGS. 2A to 3C as appropriate.

  As schematically shown in FIGS. 2A and 2B, the measurement unit 100 according to the present embodiment measures the magnitude of the velocity component along a predetermined measurement direction at a measurement point on the surface of the member S to be measured. A first speedometer 101 and a second speedometer 103 are provided. Here, it is assumed that the member to be measured S is moving in the Z-axis direction in FIGS. 2A and 2B and is rotating in the direction of turning the right screw from the X-axis toward the Y-axis.

  The first and second speedometers 101 and 103 are not particularly limited as long as they can measure the magnitude of the speed component along the predetermined measurement direction of the member to be measured S without contact. A known speedometer can be used. As an example of such a velocimeter, a laser Doppler velocimeter that measures the velocity of an object to be measured using the Doppler effect by laser light can be cited. In the following description, a case where a laser Doppler velocimeter is used as the first and second velocimeters 101 and 103 will be described as an example.

  As shown in FIG. 2A, the first speedometer 101 and the second speedometer 103 are disposed immediately above the central axis C, which is the traveling direction of the member to be measured S and is also the rotation axis. The central axes 101 and 103 are provided so as to be orthogonal to the central axis C that is the traveling direction of the member S to be measured. That is, the central axes of the speedometers 101 and 103 are provided so as to be substantially parallel to the Y axis in FIG. 2A. In the example shown in FIG. 2B, the first speedometer 101 and the second speedometer 103 are provided close to each other so that the same point on the surface of the member S to be measured is a measurement point. Yes.

The speedometers 101 and 103 used in the measurement unit 100 according to the present embodiment measure the magnitude of the speed component along a predetermined measurement direction. Here, as shown in FIG. 3A, the angle formed between the measurement direction 105 of the speed component of the first speedometer 101 and the central axis C is θ ₁ degree, and the speed of the second speedometer 103 is The angle formed by the component measurement direction 107 and the central axis C is θ ₂ degrees. In addition, the measurement direction 105 of the first speedometer 101 is tilted so as to face the downstream side of the rotation direction of the member to be measured S, and the measurement direction 107 of the second speedometer 103 is a member to be measured. It is installed to be inclined so as to face the upstream side in the rotation direction of S. Hereinafter, the rotation direction of the member S to be measured is a positive direction, the installation angle of the first speedometer 101 is represented as + θ ₁ degree, and the installation angle of the _second speedometer 103 is represented as −θ ₂ degrees. And

  In the measurement unit 100 according to the present embodiment, the first speedometer 101 and the second speedometer 103 have a certain point (point P in FIG. 3A) on the surface of the member S to be measured as a measurement point. The magnitude of the velocity component in each measurement direction is measured at the same timing. By measuring the same measurement point at the same timing, even when the shape change of the outer shape of the member to be measured S (for example, the outer diameter from the central axis C to the surface of the member to be measured S) is large, The speed can be measured accurately without being affected. That is, the magnitude of the rotational speed component changes in accordance with the outer diameter of the member to be measured S. Therefore, when the shape change of the outer shape of the member to be measured S is large, the surface of the member to be measured S There are cases where any two points have different rotational speed components. Therefore, by making the measurement point the same in the two speedometers 101 and 103, it is possible to suppress the fluctuation of the rotational speed component due to the shape change of the outer shape from being superimposed on the measurement data.

  On the other hand, in the production line in which the speed measuring device 10 is provided, a member having a small change in the outer shape of the member to be measured S is always conveyed (for example, a metal tube such as a steel pipe in which the member S to be measured conforms to a predetermined standard). And a situation in which an error in the outer diameter from the central axis C to the surface of the member to be measured S is small) may occur. When the shape change of the outer shape of the member S to be measured is not large, it is considered that the fluctuation of the rotational speed component accompanying the shape change as described above is also small. For example, as shown in FIG. 3B and FIG. The measurement points of the speedometers 101 and 103 can be different from each other.

  In the example shown in FIG. 3B, the measurement point P of the first speedometer 101 and the measurement point Q of the second speedometer 103 are located on the central axis C, and the point P and the point Q are The different cases are illustrated. In the example shown in FIG. 3C, a case where the measurement point P of the first speedometer 101 and the measurement point R of the second speedometer 103 are on different axes is illustrated. Even in such a case, since the member S to be measured is a rigid body, the speed of the member S to be measured at a certain same moment is measured by measuring the two speedometers 101 and 103 at the same timing. be able to.

  As shown in FIGS. 3B and 3C, when the measurement points of the two speedometers 101 and 103 are different points, the two measurement points are preferably located as close as possible.

As shown in FIGS. 3A to 3C, the installation angles θ ₁ and θ ₂ of the _two speedometers 101 and 103 are each set to 0 ° or more, and at least one of the installation angles exceeds 0 °. . That is, at least one of the measurement directions 105 and 107 of the two speedometers 101 and 103 is not parallel to the central axis C. On the other hand, as will be described in detail below, since the member to be measured S rotates in a certain direction and proceeds in a direction different from the rotation direction, either one of the speedometers 101 and 103 has a negative magnitude. The velocity component (that is, the direction of the vector representing the velocity component is opposite to the vector representing the measurement direction shown in FIGS. 3A to 3C). Here, the magnitude of the velocity component measured as a negative value depends on the rotation speed of the member S to be measured. Accordingly, the installation angle θ depends on the operating conditions (that is, the diameter of the member S to be measured, the set value of the rotational speed, etc.), the limit value of the negative speed that can be measured by the speedometer, and the like. It is important to set an upper limit value for the magnitudes of ₁ and θ ₂ in advance.

In addition, the preferable range of the magnitude | size of installation angle (theta) ₁ , (theta) ₂ is demonstrated anew below.

  The configuration of the measurement unit 100 according to this embodiment has been described in detail above with reference to FIGS. 2A to 3C.

<Configuration of Arithmetic Processing Unit 200>
Next, the configuration of the arithmetic processing unit 200 included in the speed measurement device 10 according to the present embodiment will be described in detail with reference to FIGS. 4 to 6. FIG. 4 is a block diagram illustrating an example of a configuration of an arithmetic processing unit included in the speed measurement device according to the present embodiment. 5 and 6 are explanatory diagrams for explaining a speed calculation process in the arithmetic processing unit according to the present embodiment.

  As described above, the arithmetic processing unit 200 according to the present embodiment controls the measurement processing in the measurement unit 100 as a whole, and uses the measurement data of the member to be measured S measured by the measurement unit 100 to perform measurement. This is a unit for calculating the speed of the measuring member S. A specific configuration of the arithmetic processing unit 200 is not particularly limited, and a known arithmetic processing unit can be used. For example, the arithmetic processing unit 200 may be a control board made of an IC chip or the like mounted on the measurement unit 100 as described above. Further, the arithmetic processing unit 200 may be an arithmetic processing device such as a computer that comprehensively controls the functions of the measurement unit 100.

  As schematically shown in FIG. 4, the arithmetic processing unit 200 according to the present embodiment includes a speedometer control unit 201, a measurement data acquisition unit 203, a speed calculation unit 205, a measurement result output unit 207, a display A control unit 209 and a storage unit 211 are mainly provided.

  The speedometer control unit 201 is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a communication device, and the like. The speedometer control unit 201 comprehensively controls the measurement process of the member S to be measured in the measurement unit 100. Further, the speedometer control unit 201 outputs a control signal for starting the speed component measurement process in a predetermined measurement direction to the speedometers 101 and 103 of the measurement unit 100 at predetermined time intervals. Thereby, the speedometers 101 and 103 of the measurement unit 100 measure the magnitude of the speed component in the predetermined measurement direction of the member S to be measured at predetermined time intervals.

  The measurement data acquisition unit 203 is realized by, for example, a CPU, a ROM, a RAM, a communication device, and the like. The measurement data acquisition unit 203 acquires two types of measurement data related to the member to be measured S generated by the measurement unit 100 (more specifically, the first speedometer 101 and the second speedometer 103). And output to a speed calculation unit 205 described later.

  The speed calculation unit 205 is realized by, for example, a CPU, a ROM, a RAM, and the like. The speed calculation unit 205 includes two types of measurement data measured by the measurement unit 100 (ie, first measurement data measured by the first speedometer 101 and second measurement measured by the second speedometer 103). Data) is used to calculate the speed of the member S to be measured.

More specifically, the speed calculation unit 205 includes the first measurement data V ₁ , the second measurement data V _2, and information about the angle formed by the measurement direction and the traveling direction of the member to be measured (that is, the angle + θ ₁ , − θ ₂ ) is used to calculate the magnitude of the velocity component in the traveling direction of the member to be measured S and the magnitude of the velocity component in the rotation direction of the member to be measured S.

  Hereinafter, the speed calculation processing of the member S to be measured by the speed calculation unit 205 will be described in detail with reference to FIGS. 5 and 6.

As described above, the first speedometer 101 is disposed so that the measurement direction 105 is inclined by θ ₁ degree toward the downstream side in the rotation direction with respect to the traveling direction of the member S to be measured. The speedometer 103 is arranged so that the measurement direction 107 is inclined by θ ₂ degrees upstream in the rotation direction with respect to the traveling direction of the member S to be measured. That is, the angle between the measurement direction 105 of the first speedometer 101 and the traveling direction is + θ ₁ degree, and the angle between the measurement direction 107 of the second speedometer 103 and the traveling direction is −θ ₂ degrees. Yes. As a result, the first speedometer 101 and the second speedometer 103 measure the speed affected by the two types of speed components, the speed component in the traveling direction and the speed component in the rotational direction.

That is, as shown in FIG. 5, V _a = V _h × cos θ ₁ acts on the measurement direction 105 of the first speedometer 101 as an influence from the speed component (travel speed component) V _{h in} the travel direction. doing. In addition, V _b = V _r × sin θ ₁ acts on the measurement direction 105 of the first speedometer 101 as an influence from the rotational speed component (rotational speed component) V _r . Accordingly, V ₁ = V _a + V _b acts as _a result in the measurement direction 105 of the first speedometer 101. Therefore, the value of the first measurement data V ₁ measured by the first speedometer 101 is represented by the following expression 101.

Further, as shown in FIG. 6, in the measurement direction 107 of the second speedometer 103, V _c = V _h × cos (−θ ₂ ) = V _h × cos θ as an influence from the traveling speed component V _{h. 2} is working. Further, V _b = V _r × sin (−θ ₂ ) = − V _r × sin θ ₂ acts on the measurement direction 107 of the second speedometer 103 as an influence from the rotational speed component V _r . Therefore, V ₂ = V _c + V _d acts on the measurement direction 107 of the second speedometer 103 as a result. Therefore, the value of the second measurement data V ₂ measured by the second speedometer 103 is represented by the following expression 103.

Here, as is clear from FIG. 6, the second speedometer 103 is inclined by θ ₂ degrees upstream in the rotational direction, and therefore the rotational speed component V _d is negative in the second speedometer 103. Measured as a value. Therefore, as is apparent from a comparison of the above formula 101 and Formula 103, the speed V ₂ which is measured at a second speed meter 103 is slower than the speed V ₁ which is measured at a first speed meter 101.

The size of the rotational velocity component V _d which is measured as a negative value is dependent on the speed of rotation of the measuring member S. Accordingly, the angle θ ₂ depends on the operating conditions (that is, the diameter of the member S to be measured, the set value of the rotation speed, etc.), the limit value of the magnitude of the negative speed that can be measured by the speedometer, and the like. It is important to set the size of.

Further, taking a manufacturing process of a metal pipe such as a steel pipe as an example, it is important to accurately measure the speed in the traveling direction rather than the speed in the rotating direction. Therefore, in the speeds V ₁ and V ₂ measured by the respective speedometers 101 and 103, it is preferable that the contribution of the traveling speed component to the measured value is 50% or more. That is, taking the measurement data V ₁ of the _first speedometer 101 shown in FIG. 5 as an example, it is preferable that V _a / (V _a + V _b ) ≧ 0.5 holds. For even the measurement data V ₂ of the second speed meter 103 shown in FIG. 6, the same can be said with the measurement data V _1.

When the upper limits of the installation angles θ ₁ , θ ₂ are calculated based on various operating conditions, speedometer performance, and the like in accordance with this viewpoint, the upper limits of θ ₁ , θ ₂ are preferably 20 deg. That is, the magnitudes of the installation angles θ ₁ and θ ₂ are preferably 0 deg ≦ | θ ₁ , θ ₂ | ≦ 20 deg. Incidentally, the installation angle theta _1, the magnitude of theta _{2 is, 0deg ≦ | θ 1, θ} 2 | more preferably _{≦ 10deg, 0deg ≦ | θ 1} , θ 2 | further be a ≦ 4.5Deg preferable. When the installation angles θ ₁ and θ ₂ satisfy such a condition, the magnitude of the traveling speed component can be calculated with higher accuracy by the arithmetic processing described later.

When it is more important to measure the rotational speed component more accurately than the traveling speed component, the same examination as described above is performed, and the contribution of the rotational speed component to the measured values of the speedometers 101 and 103 is 50%. What is necessary is just to set the upper limit of installation angle (theta) ₁ , (theta) _{2 so} that it may become% or more.

As is clear from the above formulas 101 and 103, the installation angles θ ₁ and θ ₂ of the speedometers 101 and 103 are actual mounting angles of the speedometer to the conveyance line of the member S to be measured, and are known values. is there. Measurement data V ₁ and V ₂ are values output from the speedometers 101 and 103. Therefore, in the above formulas 101 and 103, the unknown values are two values of the traveling speed component V _h and the rotational speed component V _r . Accordingly, the speed calculation unit 205 can calculate the two values of the traveling speed component V _h and the rotational speed component V _r by solving the above formulas 101 and 103 in combination.

In other words, the traveling speed component V _h can be expressed as the following Expression 105 by eliminating the rotational speed component V _r by combining the above Expressions 101 and 103. In addition, the rotational speed component V _r can be expressed as the following expression 107 by eliminating the traveling speed component V _h by combining the above expressions 101 and 103. Thus, the speed calculation unit 205, the first measurement data V ₁ and the second measurement data V ₂ output from the measurement data obtaining unit 203, information regarding the installation angle of the speedometer stored in the storage unit 211 or the like (i.e. , Θ ₁ and θ ₂ ), the two values of the traveling speed component V _h and the rotational speed component V _r can be calculated based on the following formula 105 and formula 107. it can.

Further, when the first speedometer 101 and the second speedometer 103 can be evenly arranged with respect to the rotation axis C, and | θ ₁ | = | θ ₂ | holds, Expression 105 and Expression 107 can be further simplified. That is, the speed calculation unit 205, the first measurement data V ₁ and the second measurement data V ₂ output from the measurement data obtaining unit 203, information regarding the installation angle of the speedometer stored in the storage unit 211 or the like (i.e. , | Θ ₁ | = | θ ₂ | = θ), based on the following formula 109 and formula 111, two of the traveling speed component V _h and the rotational speed component V _r A value can be calculated.

Here, in the technique disclosed in Patent Document 3, an error in attaching the speedometers 101 and 103 to the conveyance line of the member S to be measured occurs, and θ _1, which is an essential condition of the technique disclosed in Patent Document 3. = If θ ₂ could not be realized, it is not possible to perform an accurate speed measurement. On the other hand, in the speed calculation process according to the present embodiment, even if an attachment error occurs in the speedometers 101 and 103, if the accurate magnitudes θ ₁ and θ _{2 of} the attachment angles can be specified, the speed measurement is accurately performed. Can be performed.

  When the speed calculation unit 205 calculates the speed of the member to be measured S based on the above formula 105, formula 107 (or formula 109, formula 111), the obtained speed calculation result is sent to the measurement result output unit 207. Output.

  The measurement result output unit 207 is realized by a CPU, a ROM, a RAM, and the like, for example. The measurement result output unit 207 outputs information regarding the speed of the member S to be measured output from the speed calculation unit 205 to the display control unit 209. Thereby, the information regarding the speed of the member S to be measured is output to the display unit (not shown). Further, the measurement result output unit 207 may output the obtained measurement results to an external device such as a production control computer, or may use the obtained measurement results to create various forms. Good. Further, the measurement result output unit 207 may store information on the measurement result of the speed of the member to be measured S as history information in the storage unit 211 or the like in association with time information on the date and time when the information is calculated.

  The display control unit 209 is realized by, for example, a CPU, a ROM, a RAM, an output device, and the like. The display control unit 209 outputs the measurement result regarding the speed of the member S to be measured, which is transmitted from the measurement result output unit 207, to an output device such as a display provided in the arithmetic processing unit 200 or an output provided outside the arithmetic processing unit 200. Display control when displaying on a device or the like is performed. Thereby, the user of the speed measuring device 10 can grasp the measurement result regarding the speed of the member S to be measured on the spot.

  The storage unit 211 is realized by, for example, a RAM or a storage device included in the arithmetic processing unit 200 according to the present embodiment. The storage unit 211 stores various parameters, processes in progress, or various databases and programs that need to be saved when the arithmetic processing unit 200 according to the present embodiment performs some processing. To be recorded. The storage unit 211 can be freely read and written by the speedometer control unit 201, the measurement data acquisition unit 203, the speed calculation unit 205, the measurement result output unit 207, the display control unit 209, and the like.

  Heretofore, an example of the function of the arithmetic processing unit 200 according to the present embodiment has been shown. Each component described above may be configured using a general-purpose member or circuit, or may be configured by hardware specialized for the function of each component. In addition, the CPU or the like may perform all functions of each component. Therefore, it is possible to appropriately change the configuration to be used according to the technical level at the time of carrying out the present embodiment.

  Note that a computer program for realizing each function of the arithmetic processing unit according to the present embodiment as described above can be produced and installed in a personal computer or the like. In addition, a computer-readable recording medium storing such a computer program can be provided. The recording medium is, for example, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, or the like. Further, the above computer program may be distributed via a network, for example, without using a recording medium.

(About speed measurement method)
Next, an example of the flow of the speed measuring method in the speed measuring apparatus 10 according to the present embodiment will be briefly described with reference to FIG. FIG. 7 is a flowchart showing an example of the flow of the speed measuring method according to the present embodiment.

  In the speed measurement device 10 according to the present embodiment, first, the speedometer control unit 201 of the arithmetic processing unit 200 includes two speedometers (a first speedometer 101 and a second speedometer provided in the measurement unit 100). 103) are synchronized with each other, and measurement is performed at the same time (step S101). Thereafter, the two speedometers 101 and 103 of the measurement unit 100 output the obtained two types of measurement data (that is, the first measurement data and the second measurement data) to the arithmetic processing unit 200 (step S103). ).

  When the measurement data is output from the two speedometers 101 and 103, the measurement data acquisition unit 203 of the arithmetic processing unit 200 converts the acquired two types of measurement data (first measurement data and second measurement data) into a speed. It outputs to the calculation part 205.

The speed calculation unit 205 calculates the speed component of interest (that is, the traveling speed component V _h and the rotation speed component V _r ) using the first measurement data and the second measurement data transmitted from the measurement data acquisition unit 203. (Step S105). Thereafter, the speed calculation unit 205 outputs the calculated speed component to the measurement result output unit 207.

  Subsequently, the measurement result output unit 207 outputs data regarding the calculated velocity component (step S107). Thereby, the user of the speed measuring device 10 can accurately grasp the speed of the member to be measured S.

  The speed measurement method according to the present embodiment has been briefly described above with reference to FIG.

(About hardware configuration)
Next, the hardware configuration of the arithmetic processing unit 200 according to the embodiment of the present invention will be described in detail with reference to FIG. FIG. 8 is a block diagram for explaining the hardware configuration of the arithmetic processing unit 200 according to the embodiment of the present invention.

  The arithmetic processing unit 200 mainly includes a CPU 901, a ROM 903, and a RAM 905. The arithmetic processing unit 200 further includes a bus 907, an input device 909, an output device 911, a storage device 913, a drive 915, a connection port 917, and a communication device 919.

  The CPU 901 functions as an arithmetic processing device and a control device, and controls all or a part of the operation in the arithmetic processing unit 200 according to various programs recorded in the ROM 903, the RAM 905, the storage device 913, or the removable recording medium 921. The ROM 903 stores programs used by the CPU 901, calculation parameters, and the like. The RAM 905 primarily stores programs used by the CPU 901, parameters that change as appropriate during execution of the programs, and the like. These are connected to each other by a bus 907 constituted by an internal bus such as a CPU bus.

  The bus 907 is connected to an external bus such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge.

  The input device 909 is an operation unit operated by the user, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. The input device 909 may be, for example, remote control means (so-called remote controller) using infrared rays or other radio waves, or may be an external connection device 923 such as a PDA corresponding to the operation of the arithmetic processing unit 200. May be. Furthermore, the input device 909 includes, for example, an input control circuit that generates an input signal based on information input by a user using the operation unit and outputs the input signal to the CPU 901. The user of the speed measuring device 10 can input various data and instruct processing operations to the arithmetic processing unit 200 by operating the input device 909.

  The output device 911 is configured by a device that can notify the user of the acquired information visually or audibly. Examples of such devices include CRT display devices, liquid crystal display devices, plasma display devices, EL display devices and display devices such as lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, and facsimiles. The output device 911 outputs results obtained by various processes performed by the arithmetic processing unit 200, for example. Specifically, the display device displays the results obtained by various processes performed by the arithmetic processing unit 200 as text or images. On the other hand, the audio output device converts an audio signal composed of reproduced audio data, acoustic data, and the like into an analog signal and outputs the analog signal.

  The storage device 913 is a data storage device configured as an example of a storage unit of the arithmetic processing unit 200. The storage device 913 includes, for example, a magnetic storage device such as an HDD (Hard Disk Drive), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. The storage device 913 stores programs executed by the CPU 901, various data, various data acquired from the outside, and the like.

  The drive 915 is a recording medium reader / writer, and is built in or externally attached to the arithmetic processing unit 200. The drive 915 reads information recorded on a removable recording medium 921 such as a mounted magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, and outputs the information to the RAM 905. The drive 915 can also write a record on a removable recording medium 921 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The removable recording medium 921 is, for example, a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. The removable recording medium 921 may be a CompactFlash (registered trademark) (CompactFlash: CF), a flash memory, an SD memory card (Secure Digital memory card), or the like. Further, the removable recording medium 921 may be, for example, an IC card (Integrated Circuit card) on which a non-contact IC chip is mounted, an electronic device, or the like.

  The connection port 917 is a port for directly connecting a device to the arithmetic processing unit 200. Examples of the connection port 917 include a USB (Universal Serial Bus) port, an IEEE 1394 port, a SCSI (Small Computer System Interface) port, and an RS-232C port. By connecting the external connection device 923 to the connection port 917, the arithmetic processing unit 200 acquires various data directly from the external connection device 923 or provides various data to the external connection device 923.

  The communication device 919 is a communication interface configured with, for example, a communication device for connecting to the communication network 925. The communication device 919 is, for example, a communication card for wired or wireless LAN (Local Area Network), Bluetooth (registered trademark), or WUSB (Wireless USB). The communication device 919 may be a router for optical communication, a router for ADSL (Asymmetric Digital Subscriber Line), or a modem for various communication. The communication device 919 can transmit and receive signals and the like according to a predetermined protocol such as TCP / IP, for example, with the Internet and other communication devices. The communication network 925 connected to the communication device 919 is configured by a wired or wireless network, and is, for example, the Internet, a home LAN, an in-house LAN, infrared communication, radio wave communication, satellite communication, or the like. May be.

  Heretofore, an example of the hardware configuration capable of realizing the function of the arithmetic processing unit 200 according to the embodiment of the present invention has been shown. Each component described above may be configured using a general-purpose member, or may be configured by hardware specialized for the function of each component. Therefore, it is possible to change the hardware configuration to be used as appropriate according to the technical level at the time of carrying out this embodiment.

  Subsequently, the speed measuring device and the speed measuring method according to the present invention will be described specifically with reference to examples. In addition, the Example shown below is an example to the last of the speed measuring apparatus and speed measuring method which concern on this invention, Comprising: The speed measuring apparatus and speed measuring method which concern on this invention are not limited to the following example.

  The laser Doppler velocimeter that can be suitably used in the measurement unit 100 according to the present embodiment can measure the speed in the traveling direction by installing the measurement surface in accordance with the traveling direction. However, in the case of a rotating material as in the present invention, the laser Doppler velocimeter measures the speed component including the rotational speed component, so that the error is considered to increase.

  Therefore, in Example 1 below, in order to verify the performance of a general laser Doppler velocimeter, the following measurement was performed using one laser Doppler velocimeter. That is, the output from the laser Doppler velocimeter was verified by changing the installation angle of the laser Doppler velocimeter (for example, θ1 in FIG. 3A) from 0 ° to 10 ° with respect to the traveling direction of the member S to be measured.

  Here, the laser Doppler velocimeter used is a laser Doppler velocimeter using a class 2 laser (center wavelength: 633 nm). Further, a steel pipe having an outer diameter of 93 mm is used as the member S to be measured. In such a steel pipe conveyance line, the traveling direction speed of the steel pipe is set to 150 mm / second, and the rotational direction speed is set to 1911 mm / second. ing. That is, when the laser Doppler velocimeter is functioning appropriately, 150 mm / sec should be measured as the speed in the traveling direction of the steel pipe.

  The obtained measurement result and the error from the true value (150 mm / second) are shown together in FIG. In FIG. 9, the horizontal axis represents the size (unit: degree) of the installation angle of the laser Doppler velocimeter, and the vertical axis represents the measurement value of the laser Doppler velocimeter and the measurement error from the true value. In FIG. 9, the measured values of the laser Doppler velocimeter are plotted with ◯, and the measurement error from the true value is plotted with ◆.

  As is apparent from FIG. 9, when the installation angle θ is 0 °, the output of the laser Doppler velocimeter is a true value of 150 mm / second, but the installation angle θ exceeds 0 °, and the angle It can be seen that the measurement error increases as the absolute value of increases.

  That is, when the laser Doppler velocimeter is tilted, the rotational speed component is also detected, resulting in a large error in the measured value. Even when the inclination of the laser Doppler velocimeter and the member S to be measured is 1 °, the measurement error is 30.9 mm / second as shown in FIG. 9, which is about 20%. Even if the installation angle is less than 1 degree, the measurement error is 10 mm / sec or more.

  In addition, after the laser Doppler velocimeter is installed, the installation angle on the transfer line is measured with high accuracy, and even when the angle is recognized as 1 °, only one laser Doppler velocimeter is used. The composite value of the velocity component will be measured. As a result, with the method as shown in Patent Document 2, it is impossible to distinguish between a speed change in the traveling direction and a speed change in the rotational direction, and accurate speed measurement cannot be performed.

  FIG. 10 shows measured values at various speeds of the laser Doppler velocimeter used in this example. The member to be measured S is in a non-rotating state and excludes rotational components, and the measuring direction is exactly 0 ° with respect to the traveling direction.

The results obtained are shown in FIG. The horizontal axis in FIG. 10 is the traveling direction speed of the member S to be measured set in the transport line, and the vertical axis in FIG. 10 is the output value of the laser Doppler velocimeter.
As is apparent from FIG. 10, the output value of the laser Doppler velocimeter is almost the same as the set value, and the error is 3σ = 1.45 mm / sec, which is an error of about 1%. . Therefore, even when the member to be measured S is in the rotating state, it is important that the measurement is performed with at least an error equivalent to that in the non-rotating state.

  Note that the measurement error of the laser Doppler velocimeter changes depending on the model, laser output, etc., and therefore the error of 3σ = 1.45 mm / sec does not represent the measurement accuracy of all laser Doppler velocimeters. Another object of the present invention is to ensure the measurement accuracy inherent to the laser Doppler velocimeter even in the rotating member to be measured S.

Subsequently, the traveling speed of the rotating body under the same conditions as described above was measured by the speed measuring method according to the present invention using two laser Doppler velocimeters. The measurement results shown in FIG. 11 are obtained when the installation angle of the two laser Doppler velocimeters with respect to the traveling direction is θ ₁ = θ ₂ = θ, and the laser Doppler velocimeter is installed as shown in FIG. 3A. It is a measurement result. Further, the measurement results shown in FIG. 12 show that the installation angle of the two laser Doppler velocimeters with respect to the traveling direction is θ ₁ ≠ θ ₂ and the laser Doppler velocimeter is installed as shown in FIG. 3A. It is a measurement result.

11 and 12, the horizontal axis represents the magnitude of the installation angle of the laser Doppler velocimeter, and in FIG. 12, the installation angle θ _{1 of} the first velocimeter 101 and the installation of the second velocimeter 103. A combination with the angle θ ₂ is expressed as (θ ₁ & θ ₂ ). In FIG. 11 and FIG. 12, the obtained measured values (that is, calculated values) are plotted with ◯, and the measurement error from the true value is plotted with ♦.

  In addition, in the example shown in FIG. 11, the traveling direction speed is calculated using the above equation 109 in the example shown in FIG. 11, and the above equation is used in the example shown in FIG. 12, using the measurement data from the two laser Doppler velocimeters. 105 was used to calculate the traveling direction velocity.

  As shown in FIG. 11, an angle is set with respect to the conveying line of the rotating material that is the member to be measured S, and the measurement error is reduced to 2 mm / sec by eliminating the influence of the rotating component using the above equation 109. It turns out that it became possible to suppress significantly to less than. Further, the measurement accuracy in the measurement example shown in FIG. 11 was 3σ = 1.68 mm / sec. From this result, it became clear that by using the speed measurement method according to the present invention, it is possible to ensure a measurement accuracy substantially equal to the measurement accuracy in the ideal state shown in FIG.

  In addition, as shown in FIG. 12, even when the installation angles of the two laser Doppler velocimeters are different, it can be seen that a measurement error equivalent to the example shown in FIG. 11 is obtained. From this, it can be seen that the above formula 105 and formula 107 can be used to measure the speed in the traveling direction and the rotational direction, and to increase the degree of freedom in setting the angle of the laser Doppler velocimeter. It was.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Speed measuring apparatus 100 Measuring unit 101,103 Speedometer (Laser Doppler speedometer)
105, 107 Measurement direction 200 Arithmetic processing unit 201 Speedometer control unit 203 Measurement data acquisition unit 205 Speed calculation unit 207 Measurement result output unit 209 Display control unit 211 Storage unit

Claims (9)

Measurement that measures the magnitude of the velocity component along the predetermined measurement direction of the member to be measured while rotating around the predetermined axis of rotation while proceeding in the direction of the axis of rotation. Unit,
An arithmetic processing unit that calculates the speed of the member to be measured using measurement data of the member to be measured measured by the measurement unit;
With
The measurement unit includes first and second speedometers that measure the magnitude of a speed component along the predetermined measurement direction at a measurement point on the surface of the member to be measured.
The first speedometer is arranged such that an angle formed by the measurement direction and the traveling direction of the member to be measured is + θ ₁ degree when the rotation direction of the member to be measured is a positive direction, and The second speedometer is arranged such that an angle formed by the measurement direction and the traveling direction is −θ ₂ degrees,
The first speedometer and the second speedometer are speed measuring devices that perform measurement at the same timing. The arithmetic processing unit, the measurement data of the first speedometer represented as V _1, the measurement data of the second speedometer when expressed as V _2, based on Equation 11 below, the measured The speed measuring device according to claim 1, wherein the speed component V _h in the traveling direction of the member is calculated.

The arithmetic processing unit, the measurement data of the first speedometer represented as V _1, the measurement data of the second speedometer when expressed as V _2, based on Equation 13 below, the measured The speed measuring device according to claim 1, wherein a speed component V _r in a rotation direction of the member is calculated.

The magnitudes of angles formed by the measurement direction and the traveling direction of the member to be measured in the first speedometer and the second speedometer are 0 deg ≦ | θ ₁ , θ ₂ | ≦ 20 deg. The speed measuring device according to any one of 1 to 3.   The speed measuring apparatus according to claim 1, wherein the first and second speedometers measure the same measurement point on the surface of the member to be measured at the same timing.   The speed measuring apparatus according to claim 1, wherein the first and second speedometers measure different measurement points on the surface of the member to be measured at the same timing.   The speed measuring apparatus according to claim 1, wherein the first and second speedometers are laser Doppler speedometers.   The speed measuring device according to claim 1, wherein the member to be measured is a metal tube. For the member to be measured that is rotating in the direction of the rotation axis while rotating around the predetermined rotation axis, the magnitude of the velocity component along the predetermined measurement direction at the measurement point on the surface of the member to be measured is A first speedometer disposed so that an angle formed by the measurement direction and the traveling direction of the member to be measured is + θ ₁ degree when the rotation direction of the member to be measured is a positive direction; Using a measurement unit including a second speedometer arranged so that an angle formed by a direction and the traveling direction is −θ ₂ degrees, the measurement timing of the first speedometer, A measurement step of measuring so that the measurement timings of the two speedometers are the same as each other;
A speed calculating step for calculating a speed of the member to be measured using measurement data of the member to be measured measured by the measurement unit;
A speed measuring method including:

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