JPH0517531U - Magnetostrictive stress measuring device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Widen the measurable range of the measured object such as a pipe,
Magnetostrictive stress measurement device that can improve workability. [Structure] A ring gear 100 forming a ring-shaped rail to be mounted on an outer peripheral surface 11 of a right cylindrical pipe 1 such as a steel pipe.
A traveling device 110 that is a bogie that travels on the outer peripheral surface 11 of the pipe 1 by being guided by the ring gear 100, and the traveling device 11
Slider 12 for holder mounting, which is mounted so that it can move up and down
5, a sensor holder 130 which is a support member attached to the outer peripheral surface thereof, and a magnetostrictive sensor 140 which is vertically held at a constant height from the surface to be measured. Three rollers 45 are arranged inside the ring-shaped rail at intervals in the circumferential direction, and the rollers are rotatably provided around an axis parallel to the diameter line. The magnetostrictive stress can be measured at the desired position by moving the ring-shaped rail in the pipe axis direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a non-contact type magnetostrictive stress measuring device for an object to be measured such as a cylindrical material such as a round bar and a pipe.

[0002]

[Prior Art]

 In the magnetostrictive stress measurement method, when a load is applied to a magnetic material, anisotropy occurs in the magnetic permeability, and the magnetic permeability in the load direction increases, while the magnetic permeability in the direction perpendicular to the load direction decreases, so This is a method for measuring the direction and magnitude of the principal stress by detecting the difference with a magnetostrictive sensor having an exciting core and a detecting core. Such a magnetostrictive stress measuring method is generally performed by bringing a magnetostrictive sensor into contact with the surface to be measured.

However, in this contact-type measurement, there is a disadvantage that the measurement error becomes large because the magnetic resistance at the contact surface greatly differs depending on the state of the surface to be measured.

One configuration proposed to solve this problem is shown in FIG. In order to measure the bending stress of the pipe 15 such as a steel pipe, a semicircular rail 16 which is divided into two is attached to the outer peripheral surface of the pipe 15, and a traveling carriage 17 is provided on the rail 16. A magnetostrictive sensor 18 is fixed to the traveling carriage 17, and the magnetostrictive sensor 18 performs measurement in a non-contact state in which the magnetostrictive sensor 18 is separated from the outer surface of the tube 15 by a certain distance.

[0005]

[Problems to be solved by the device]

 In the prior art shown in FIG. 8, in order to measure the magnetostrictive stress at different locations in the tube axis direction of the tube 15, the ring-shaped rail 16 is once removed from the tube 15 and again at a different location in the tube axis direction. I am wearing it. Therefore, workability is troublesome.

An object of the present invention is to provide a magnetostrictive stress measuring device capable of increasing the measurable range of an object to be measured such as a tube and improving workability.

[0007]

[Means for Solving the Problems]

 The present invention includes a ring-shaped rail mounted around the outer periphery of an object to be measured, a carriage movable along the rail, a magnetostrictive sensor provided in association with the carriage, and a diameter line inside the ring-shaped rail. A magnetostrictive stress measuring device comprising: at least three rollers which are rotatably provided around parallel axes and arranged at intervals in the circumferential direction.

[0008]

[Action]

 As described above, according to the present invention, the ring-shaped rail is attached so as to surround the circumference of the object to be measured such as a pipe, and the carriage can be moved along the ring-shaped rail. Is provided and at least three rollers are circumferentially spaced inside the ring-shaped rail so that the ring-shaped rail can move along the axial direction. Is rotatable about an axis parallel to the diameter of the ring-shaped rail, so that the ring-shaped rail can be moved along the axis of a tube or the like, and the magnetostrictive stress can be measured at a desired position. Become.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical side view showing an embodiment of the present invention, and FIG. 2 is a plan view of a magnetostrictive stress measuring device. As shown in these drawings, in this embodiment, a ring gear 100 that constitutes a ring-shaped rail that is mounted on the outer peripheral surface 11 of a right cylindrical tube 1 such as a steel tube, and the ring gear 100 is provided on the outer peripheral surface 11 of the tube 1. The traveling device 110, which is a bogie guided by the user, is vertically mounted on the traveling device 110, and the holder mounting slide 125 is mounted on the outer periphery of the holder mounting slide 125. The sensor holder 130, which is a body, and the magnetostrictive sensor 140, which is vertically held by the sensor holder 130 at a certain height from the surface to be measured, are roughly classified.

FIG. 3 is a sectional view of the magnetostrictive stress measuring device according to the embodiment shown in FIGS. 1 and 2 as viewed from a direction perpendicular to a simplified tube axis, and FIG. 4 is a simplified side view of a part thereof. It is a figure. Inside the horizontal rail portion 102, at least three (four in this embodiment) rollers 45 are provided at equal intervals (90 degrees in this embodiment) in the circumferential direction.

FIG. 5 is a sectional view of the roller 45 and its vicinity. The axis line 46 of the roller 45 is parallel to the diameter line of the ring gear 100, and is rotatable around its rotation axis line. At least the outer periphery of the roller 45 is coated with elastic rubber, which achieves frictional contact with the outer surface 11 of the tube 1 and thus prevents the ring gear 100 from being angularly displaced about its axis. It The roller 45 is rotatably provided on the support member 47 formed in a substantially L shape as described above. A spring receiver 48 is fixed to the support member 47, and the spring receiver 48 is housed in a guide tube 49. A spring 51 is interposed between the inner peripheral surface 50 of the horizontal rail portion 102 of the ring gear 100 and the spring receiver 48, so that the roller 45 is elastically pressed against the outer surface 11 of the tube 1. In this way, the ring gear 100 can be mounted on the tube 1 coaxially with the axis of the tube 1.

FIG. 6 is a detailed sectional view perpendicular to the tube axis of the magnetostrictive stress measuring device of the embodiment shown in FIGS. 1 to 5, and FIG. 7 is a sectional view taken along the tube axis of the embodiment. , The sensor holder 130 is shown floating from the outer surface 11 of the tube 1. Referring to these drawings, in the structure of each part, a ring gear 100 is composed of two upper and lower semi-circular ring gear segments 101, and each ring gear segment 101 stands on a horizontal rail part 102 and a horizontal rail part 102. It is composed of a pair of vertical rails 103 and outer teeth 104 attached to one vertical rail 103. An upper taper surface 105 and a lower taper surface 106 are provided on both sides of the horizontal rail portion 102, respectively. Also, clamp screws 107 are rotatably attached to both ends of the pair of vertical rail portions 103 of one ring gear segment 101, respectively, and to both ends of the pair of vertical rail portions 103 of the other ring gear segment 101. Are attached to respective clamp receiving plates 108 through which the clamp screws 107 are inserted, the clamp screws 107 are inserted into the clamp receiving plates 108, and the clamp nuts 109 are fastened to the clamp screws 107 to form two ring gear segments. The ring gear 100 is configured by combining 101.

The traveling device 110 is composed of a plate-shaped traveling device main body 111 that moves along the ring gear 100 and a ring gear gripper 112 that holds the ring gear 100. A drive gear 113 that meshes with the outer teeth 104 of the ring gear 100 is pivotally supported on one side of the traveling device body 111, and a servomotor 116 with an encoder 115 is connected to the drive gear 113 via a reduction gear 114. ing. Further, a horizontal support shaft 117 is provided at a center position of a side surface of the traveling device main body 111 on the side where the drive gear 113 projects, and one side of the ring gear 100 is located below the side surface of the traveling device main body 110 on the side where the drive gear 113 projects. The cam follower 118, which is a plurality of gripping portions, is provided in rolling contact with the upper and lower tapered surfaces 105 and 106 of the.

The ring gear grip body 112 is inserted into the horizontal support shaft 117 of the traveling device main body 111 and is movable in the horizontal direction, and the horizontal support shaft 117 is inserted into the horizontal support shaft 117. And a spring 120 for urging the holding horizontal cylinder 117 away from the traveling device main body 111 and a horizontal end of the horizontal support shaft 117 for screwing the horizontal gripping cylinder 119 to prevent the horizontal gripping cylinder 119 from moving forward and backward. From the adjusting screw 121 that adjusts the distance from the traveling device main body 111, the gripping arm 122 that hangs down from the gripping horizontal cylinder 119, and the cam follower 123 that is a plurality of gripping parts attached below the gripping arm 122. It is configured.

On the side surface of the traveling apparatus main body 111 of the traveling apparatus 110 opposite to the side where the drive gear 113 projects, a flat plate-shaped holder attaching slide body 125 is vertically movably attached. The holder mounting slide body 125 is mounted by means of a dovetail groove 111a provided on the side surface of the traveling device main body 111 opposite to the side where the drive gear 113 projects and a dovetail provided on the side surface of the holder mounting slide body 125. It is performed by engaging with 125a. A compression spring 126 that constantly urges the holder mounting slide body 125 downward, that is, toward the surface to be measured is provided between one side upper part of the holder mounting slide body 125 and one side lower part of the traveling device body 111. ing. Further, a notch knob 127 is rotatably provided at the upper end of the traveling device main body 111, and a part of the notch knob 127 is fitted to a position above the side of the holder mounting slide body 125 opposite to the compression spring 126. A notch 128 for holding the height to be inserted is provided, and the notch knob 127 and the notch 128 for height holding hold the slide body 125 for holder mounting at a predetermined height with respect to the traveling device main body 111. The holding mechanism 129 is configured.

Further, the sensor holder 130 has a U-shaped connecting arm 132 rotatably attached to the holder attaching slide body 125 via the first horizontal shaft 131, and first and second end portions of the connecting arm 132. The sensor holder body 134 is swingably supported by a second horizontal shaft 133 which is orthogonal to the first horizontal shaft 131. At the bottom of the sensor holder body 134, at least three guide rollers 135 are provided at the vertices of a virtual triangle that is in rolling contact with the surface to be measured. The axis of rotation of the guide roller 135 is parallel to the axis of the ring gear 100 and thus the tube axis. Further, the magnetostrictive sensor 140 is fixed to the sensor holder main body 134 by a set screw 136 so that the lower end surface 141 thereof holds a certain minute height h from the surface to be measured.

The present embodiment is configured as described above, and its operation will be described next.

First, the ring gear 100 is assembled and set at a measurement position on the outer peripheral surface 11 of the pipe 1 of a pipe or a round bar. In this set of ring gears 100, two semi-circular ring gear segments 101 are combined so as to surround the outer peripheral surface of the pipe 1 to form a ring, and each clamp screw 107 of one ring gear segment 101 is connected to the other ring gear. The ring gear 100 is inserted into each clamp receiving plate 108 of the segment 101, and a clamp nut 109 is manually tightened to the clamp screw 107 to connect the two ring gear segments 101 to set the ring gear 100 to the pipe 1.

Next, the traveling device 110 is installed on the ring gear 100. In this case, first, the notch knob 127 provided at the upper end of the traveling device main body 111 is rotated so that the notch knob 127 has a height holding cut provided at the side above the partial holder mounting slide 125. The magnetostrictive sensor 140 held by the sensor holder 130 is fitted into the notch 128, and the holder mounting slide body 125 to which the sensor holder 130 is mounted is held at a predetermined height with respect to the traveling apparatus main body 111 so that the magnetostrictive sensor 140 is held by the ring gear. Let's rise to 100. By doing so, the magnetostrictive sensor 140 does not hit the outer peripheral surface 11 of the tube 1, and the traveling device 110 can be easily attached to the ring gear 100.

Next, the drive gear 113 of the traveling device main body 111 is engaged with the external teeth 104 attached to one vertical rail portion 103 of the ring gear 100. In addition, the ring gear 100 is held by the traveling device main body 111 by the ring gear holding body 112. That is, the plurality of cam followers 118 of the traveling device main body 111 are brought into rolling contact with the upper and lower tapered surfaces 105 and 106 on one side of the horizontal rail portion 102 of the ring gear 100, and are attached to the holding arm 122 of the ring gear holding body 112. The plurality of cam followers 123 are brought into rolling contact with the upper and lower tapered surfaces 105 and 106 on the other side of the horizontal rail portion 102 of the ring gear 100. Then, the adjusting screw 121 is screwed to move the gripping horizontal cylinder 119 integrated with the gripping arm 122 to the traveling device main body 111 side, and the cam follower 118 of the traveling device main body 111 and the cam follower 123 of the ring gear gripping body 112. The upper and lower tapered surfaces 105 and 106 on both sides of the horizontal rail portion 102 of the ring gear 100 are gripped under pressure. Therefore, the traveling device 110 does not fall out of the ring gear 100, and the cam followers 118 and 123 rotate and are guided by the ring gear 100, enabling traveling.

When the traveling device 110 installed on the ring gear 100 is run, if the notch knob 127 is rotated to eliminate the engagement with the height holding knob 128, the holder holding slide body 125 releases the height holding. Then, the holder mounting slide body 125, which is biased downward by the compression spring 126, descends, and the guide roller provided on the sensor holder body 134 of the sensor holder 130 mounted on the holder mounting slide body 125. 135 contacts the outer peripheral surface 11 of the tube 1. Moreover, the sensor holder main body 134 is provided with a connecting arm 132 mounted on the holder mounting slide body 125 via the first horizontal shaft 131 and a second horizontal shaft 133 perpendicular to the first horizontal shaft 131. Since it is pivotally supported, the connecting arm 132 automatically adjusts the inclination of the first horizontal shaft 131 in the direction parallel to the surface to be measured, and the sensor holder main body 134 moves to the second horizontal axis. The inclination about the axis 133 in the direction perpendicular to this is automatically adjusted. Further, since the magnetostrictive sensor 140 is vertically held by the sensor holder body 134 that is automatically adjusted in this way and is also held at a constant height from the surface to be measured, the sensor holder body 134 is moved by the subsequent movement of the sensor holder body 134. The holding state does not change.

As described above, the preparation for the measurement work is completed, and then the servo motor 116 is driven to rotate the traveling device 110 around the pipe 1. In this case, when the servomotor 116 is driven, its rotational force is transmitted to the drive gear 113 via the reduction gear 114. When the drive gear 113 rotates, the rotational force of the drive gear 113 is converted into a linear motion by the external teeth 104 of the ring gear 100 meshing with the drive gear 113, and the traveling device 110 travels on the ring gear 100. At this time, the cam follower 118 of the traveling device main body 111 and the cam follower 123 of the ring gear grip 112 rotate the horizontal rail portion 102 of the ring gear 100 while gripping the horizontal rail portion 102, so that the traveling device 110 travels while being guided by the horizontal rail portion 102. Then, the tube 1 orbits around the outer peripheral surface 11 of the tube 1 in a state of being closely adhered thereto. Along with this, the sensor holder 130 also moves the magnetostrictive sensor 140 together with the traveling device 110 while maintaining the above-mentioned holding relationship, so that the magnetostrictive stress of the surface to be measured can be continuously measured without contact and with extremely high accuracy. You can get the data.

When the traveling device 110 is removed from the ring gear 100 after the measurement, the holder height holding mechanism 129 is operated as described above to hold the holder mounting slide body 125 at a predetermined height and then to remove it. It is easy to remove the traveling device 110.

The direction and magnitude of the main stress can be obtained by detecting the position where the output of the magnetostrictive sensor 140 is maximized by the encoder 115 and the detected angle and output value.

In this embodiment, the sensor holder 130 is mounted on the traveling device main body 111 by mounting the sensor holder 130 via a holder mounting slide 125 that is vertically movable on the outer surface of the flat traveling device main body 111. Since the compression spring 126 for mounting the holder 130 and for urging the holder-mounting slide body 125 constantly downward is provided on the side of the holder-mounting slide body 125, the traveling device 110 is substantially higher than the traveling device body 111. It is determined by the height of and is low.

According to the above-described embodiment, the ring gear 100 is assembled at the measurement position on the outer peripheral surface of the pipe 1, the drive gear 113 of the traveling device main body 111 is meshed with the outer teeth 104 of the ring gear 100, and the ring gear 100 is connected to the traveling device main body 11. A traveling device 110 is installed on the ring gear 100 so as to grasp the ring gear 100 with the traveling device main body 111 by a ring gear grasping body 112 whose distance can be adjusted, and the traveling device 100 can be moved up and down via a holder mounting slide 125. The magnetostrictive sensor 140 is vertically held at a constant height from the surface to be measured by the sensor holder 130 which is attached and always urged downward, and the traveling device 110 drives the motor 116 to rotate the drive gear 113. When it is moved along the ring gear 100, the holder mounting slide body 12 is attached to the traveling device 110. 5 and the magnetostrictive sensor 140 attached via the sensor holder 130 are arranged so as to be perpendicular to the surface to be measured and to rotate while being kept at a constant height from the surface to be measured. On the other hand, the magnetostrictive stress measurement can be continuously performed in the circumferential direction without contact, and the traveling device main body 111 travels on the ring gear 100 having the external teeth 104 meshing with the drive gear 113. There is an effect that the outer peripheral surface is not damaged, there is no axial displacement, and the motor 116 is downsized. Further, since the holder mounting slide body 125 to which the sensor holder 130 is mounted is vertically movably mounted on the outer surface of the traveling device body 111, the traveling device 110 is higher than the traveling device body 111. The overall height of the traveling device 110 is reduced, and the size of the traveling device 110 can be reduced. Further, since the ring gear 100 on which the traveling device 110 travels is mounted on the outer peripheral surface of the assembled pipe 1, it has an effect that it can be easily attached and detached on site.

Furthermore, a holder height holding mechanism for holding the holder mounting slide body 125 at a predetermined height with respect to the traveling device main body 111 is provided, and the holder is mounted when the traveling device 110 is attached to or removed from the ring gear 100. By operating the height holding mechanism to hold the holder mounting slide body 125 at a predetermined height with respect to the traveling device body 111, the holder mounting slide body 125 is held by the holder mounting slide body 125 via the sensor holder 130. Since the magnetostrictive sensor 140 is floating, the magnetostrictive sensor 140 does not contact the outer peripheral surface of the tube 1, and there is an effect that the traveling device 110 can be easily attached to and removed from the ring gear 100.

The present invention is not only implemented for measuring the magnetostrictive stress of a tube, but can also be implemented in a wide range in relation to other measured objects other than the tube.

[0029]

[Effect of the device]

 As described above, according to the present invention, the ring-shaped rail is attached to surround the circumference of the object to be measured such as a pipe, and the carriage can be moved along the rail. The magnetostrictive sensor can measure the magnetostrictive force of an object to be measured such as a tube, and the ring-shaped rail is provided with at least three rollers arranged at intervals in the circumferential direction. Since this roller is rotatably installed around an axis parallel to the diameter line, the ring-shaped rail can be moved in the axial direction, thus widening the measurement range and improving its workability. Be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a magnetostrictive stress measuring device according to an embodiment of the present invention.

FIG. 2 is a plan view of the magnetostrictive stress measuring device.

FIG. 3 is a simplified cross-sectional view perpendicular to the tube axis of the magnetostrictive stress measuring device.

FIG. 4 is a side view of a part of the magnetostrictive stress measuring device.

FIG. 5 is an enlarged sectional view of a roller 45 and its vicinity.

FIG. 6 is a cross-sectional view perpendicular to the tube axis of the magnetostrictive stress measuring device of one embodiment shown in FIGS.

FIG. 7 is a cross-sectional view taken along the tube axis showing a state where the sensor holder 130 of the magnetostrictive stress measuring device floats above the outer surface 11 of the tube 1.

FIG. 8 is a simplified side view of a proposed configuration.

[Explanation of symbols]

 1 Pipe 11 Outer Surface 45 Roller 100 Ring Gear 104 External Teeth 110 Traveling Device 111 Traveling Device Main Body 112 Ring Gear Grip 113 Drive Gear 116 Servo Motor 117 Horizontal Support Shaft 118 Cam Follower (Gripping Part) 123 Cam Follower (Gripping Part) 125 Holder Mounting Slide Moving body 130 Sensor holder 131 Connecting shaft 131a Connecting shaft 131b Adjusting means 140 Magnetostrictive sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadaaki Sakai 1-2, Marunouchi, Chiyoda-ku, Tokyo Day Steel Pipe Co., Ltd. (72) Akifumi Kamiura 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped rail mounted around the outer periphery of an object to be measured, a carriage movable along the rail, a magnetostrictive sensor provided in association with the carriage, and a diameter line inside the ring-shaped rail. And at least three rollers which are rotatably provided about an axis line parallel to and are arranged at intervals in the circumferential direction.