JPH0629700Y2 - Magnetostrictive stress measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a non-contact magnetostrictive stress measuring device for a cylindrical material such as a round bar or a pipe.

[Prior Art] In the magnetostrictive stress measurement method, when a principal stress is applied to a magnetic material, anisotropy occurs in the magnetic permeability, the magnetic permeability in the load direction increases, and the magnetic permeability in the direction perpendicular to the load direction decreases. In this method, the direction and magnitude of the principal stress are measured by detecting the difference in both magnetic permeability with a magnetostrictive sensor having an exciting core and a detecting core. Then, such a magnetostrictive stress measurement method is
Generally, the magnetostrictive sensor is brought into contact with the surface to be measured.

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

Therefore, the idea of measuring in a non-contact state, that is, in a state in which the magnetostrictive sensor is separated from the surface to be measured by a fixed distance, comes up.

FIG. 5 is a vertical sectional side view showing a conventional non-contact type magnetostrictive stress measuring device, FIG. 6 is a side view showing a portion of a carrying device, and FIG. 7 is a plan view of FIG. In the figure, a traveling device 2 installed so as to circulate on an outer peripheral surface 11 of a columnar material 1, and a carrying device 3 accommodating on a measured surface 12 having the same diameter as the outer peripheral surface 11 attached to the traveling device 2. It consists of two major categories.

This traveling device 2 includes a traveling carriage 22 having a plurality of wheels 21,
A pressing device 24 composed of bolts, nuts, etc. for performing a relative pulling action of the elevating body 23, which is vertically movable by engaging the dovetail groove 222 and the dovetail 231 in the frame 221 of the traveling carriage 22, with respect to the carriage frame 221. A rotary shaft 25 rotatably supported by the lifting body 23, a chain wheel 26 attached to the rotary shaft 25, and a non-slip chain 27 wound between the chain wheel 26 and the columnar material 1.
And a servomotor 29 with an encoder 291 for driving the chain wheel 26 via the transmission gear mechanism 28. The servo motor 29 is attached to the lifting body 23 and is connected to the transmission gear mechanism 28 via the speed reducer 30.

In the pressing device 24, a stud bolt 241 is fixed to the upper end of the lifting body 23, a nut 242 is screwed into the tip of the bolt 241 projecting upward from the truck frame 221, and a compression spring 243 is placed between the nut 242 and the truck frame 221. It is through the.

The non-slip chain 27 that is wound around the chain wheel 26 of the rotary shaft 25 is an ordinary non-slip L chain.
It is made by attaching shape rubber number 271 on both sides. Then, the rubber plate 271 of the chain 27 which is strained by the pressing device 24 comes into close contact with the outer peripheral surface 11 of the cylindrical material 1, and the traveling device 2 is pressed onto the outer peripheral surface 11 in the radial direction of the cylindrical material 1 by the wheels 21. Hold.

The carrying device 3 holds the magnetostrictive sensor 4 vertically, and has a carrying carriage 32 having a plurality of wheels 31, a rectangular frame 33 provided around the carrying carriage 32, and both sides in the longitudinal direction of the frame 33. The connecting arm 34 pivotally mounted on the first horizontal shaft 5 and the carrying cart 32 are pivotally supported in the frame 33, and at the same time in a direction perpendicular to the first horizontal shaft 5. The second horizontal shaft 6 provided, a mounting guide 36 for engaging the upper block 35 of the connecting arm 34 with the dovetail groove 351 and the dovetail 361 to automatically move up and down, and the connecting arm 34 always on the measured surface 12 side. And a compression spring 37 that urges the The mounting guide 36 is mounted on the side surface of the carriage frame 221. The magnetostrictive sensor 4 is fixed to the carrying carriage 32 by a set screw 38 so that the lower end surface 41 of the magnetostrictive sensor 4 maintains a constant minute height h from the measured surface 12.

The conventional magnetostrictive stress measuring device is configured as described above, and the traveling device 2 is set on the outer peripheral surface 11 of the columnar material 1. next,
The servomotor 29 is driven to rotate the traveling device 2 around the cylindrical material 1. In this case, when the chain wheel 26 rotates due to the rotation of the rotating shaft 25, the non-slip chain 27 wound around the chain wheel 26 is in close contact with the outer peripheral surface of the columnar material 1, so that the rubber plate 271 causes frictional force. Since there is no slippage, the chain wheel 26 eventually makes a planetary motion around the cylindrical material 1 by using the non-slip chain 27 as a kind of bending guide.
Therefore, the traveling device 2 orbits around the outer peripheral surface 11 of the columnar material 1 in a state of being closely adhered to the outer peripheral surface 11, and the carrying device 3 equipped with the magnetostrictive sensor 4 also moves together with the traveling device 2, so that the surface to be measured is Twelve magnetostrictive stress measurements can be performed continuously without contact, and highly accurate measurement data can be obtained.

[Problems to be Solved by the Invention] In the conventional magnetostrictive stress measuring device as described above, the traveling device 2 has a traveling carriage 22 having wheels 21, an elevating body 23 provided on the traveling carriage 22 so as to be vertically movable, and an elevating body. The pressing device 24 for performing the relative lifting operation of the carriage 23 with respect to the traveling carriage 22, and the lifting body
A rotary shaft 25 rotatably supported by 23, a chain wheel 26 attached to the rotary shaft 25, a non-slip chain 27 wound around the columnar material 1, and a transmission gear mechanism.
And a servomotor 29 for driving the chain wheel 26 via 28. The traveling device 21 set on the outer peripheral surface of the columnar material 1 has its servo motor.
The rotation shaft 25 is rotated by the drive of 29, the chain wheel 26 is rotated by the rotation of the rotation shaft 25, and the non-slip chain 27 wound around it is brought into close contact with the outer peripheral surface of the columnar material 1 and does not slip. By chain wheels
26 makes a planetary motion around the cylindrical material 1 using the non-slip chain 27 as a kind of bending guide. As described above, the traveling device 2 is a chain type that orbits around the outer peripheral surface 11 of the columnar material 1 in a state of being closely adhered to the outer peripheral surface 11 of the columnar material 1. When running, there was a problem that it was displaced by several mm in the axial direction.
Further, the servomotor 29 for driving the rotary shaft 25 having the chain wheel 26 needs a large motor to counter the reaction force of the chain 27 with the slip stopper wound around the chain wheel 26, and as a result, the traveling apparatus 2 as a whole is required. There is also a problem in that it is not possible to run around once if the measurement location of the cylindrical material 11 is different. Furthermore, a chain 27 with a slip stopper when the traveling device 2 is set on the columnar material 1
It takes a long time to wrap around or remove after measurement,
Further, there is a problem that the outer peripheral surface 11 of the columnar material 1 is damaged by the chain 27 with the slip stopper.

The present invention has been made to solve such a problem, and it is easy to set the traveling device to the ring gear, the traveling device travels on the outer peripheral surface of the cylindrical material without axial displacement, and the height is low. An object of the present invention is to obtain a magnetostrictive stress measuring device that is small and lightweight and does not damage the surface to be measured.

[Means for Solving the Problems] A magnetostrictive stress measuring device according to the present invention axially supports and drives a ring gear having external teeth mounted on the outer peripheral surface of a cylindrical material and a drive gear meshing with the external teeth of the ring gear. A plate-shaped traveling device main body having a motor for driving gears and a horizontal support shaft provided on a side surface of the traveling device main body on the side of the drive gear are mounted so as to be movable and distance-adjustable, and provided on the traveling device main body. A traveling device including a ring gear grasping body having a grasping portion that grasps the ring gear with the grasping portion, a holder mounting slide body that is vertically movably attached to a side surface of the traveling device body opposite to the drive gear, and the traveling device body. The holder height holding mechanism that holds the holder mounting slide at a predetermined height, the sensor holder mounted on the outer surface of the holder mounting slide, and the sensor holder to be measured. And a magnetostrictive sensor held vertically at a constant height from the surface.

[Operation] In this invention, the ring gear is assembled and mounted at the measurement position on the outer peripheral surface of the cylindrical material, and the traveling device is installed on the ring gear. In this case, the holder height holding mechanism is operated to hold the holder mounting slide body to which the sensor holder is attached at a predetermined height with respect to the traveling device main body of the traveling device. The magnetostrictive sensor that floats above the ring gear makes it easy to attach the traveling device to the ring gear. When the traveling device is installed on the ring gear, the drive gear of the traveling device body meshes with the outer teeth of the ring gear, and the ring gear gripping body grips the ring gear by the gripping portion and the gripping portion provided on the traveling device body. In addition, when traveling, the holder holding slide in the holder height holding mechanism is released from holding the height, the sensor holder comes into contact with the outer peripheral surface of the cylindrical material, and the magnetostrictive sensor comes into contact with the sensor holder when the measurement is made. It is held vertically at a constant height above the plane. Therefore, when driving the motor,
The drive gear rotates, the traveling device moves along the ring gear while being guided by the ring gear gripping body, and the magnetostrictive sensor attached to the traveling device via the holder mounting slide and the sensor holder is the surface to be measured. On the other hand, it is automatically held vertically and at a constant height and circulates on the outer peripheral surface of the cylindrical material, and continuous magnetostrictive stress measurement can be performed without contact.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 is a longitudinal side view showing an embodiment of the present invention, FIG. 2 is a plan view of a magnetostrictive stress measuring device, FIG. 3 is another longitudinal side view of a magnetostrictive stress measuring device, and FIG. 4 is a magnetostrictive stress measuring device. FIG. 6 is a vertical cross-sectional side view showing a state where the sensor holder of FIG.

As shown in these drawings, in this embodiment, a ring gear 100 mounted on the outer peripheral surface 11 of the columnar material 1, a traveling device 110 that is guided by the ring gear 100 on the outer peripheral surface 11 of the columnar material 1, and travels by itself. A holder-mounting sliding body 125 that is vertically movable on the traveling device 110, a sensor holder 130 that is mounted on the outer peripheral surface of the holder-mounting sliding body 125, and a fixed height from the measured surface to the sensor holder 130. It is roughly composed of a magnetostrictive sensor 140 held vertically.

In the configuration of each part, the ring gear 100 is composed of two semi-arcuate ring gear segments 101, each ring gear segment 101 is a horizontal rail part 102 and a pair of vertical rail parts 103 erected on the horizontal rail part 102, and one And external teeth 104 attached to the vertical rail portion 103. An upper taper surface 105 and a lower taper surface 106 are provided on both sides of the horizontal rail portion 102, respectively. In addition, the pair of vertical rail portions 103 of one ring gear segment 101.
Clamp screws 107 are rotatably attached to both ends of the ring gear segment 101, and clamp receiving plates 108 through which the clamp screws 107 are inserted are attached to both ends of the pair of vertical rail portions 103 of the other ring gear segment 101. The clamp screw 107 is inserted into the clamp receiving plate 108, the clamp nut 109 is fastened to the clamp screw 107, and the two ring gear segments 101 are combined to form the ring gear 100.

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 grips the ring gear 100. Traveling device body 1
A drive gear 113 that meshes with the outer teeth 104 of the ring gear 100 is pivotally supported on one side of the drive gear 113, and the drive gear 113 has a speed reducer 114.
A servo motor 116 with an encoder 115 is connected via. Further, a horizontal support shaft 117 is provided at the center position of the side surface of the traveling device body 111 on the side where the drive gear 113 projects.
The upper and lower tapered surfaces 10 on one side of the ring gear 100 are located at a position below the side surface of the traveling device main body 110 where the drive gear 113 projects.
The cam follower 118, which is a plurality of gripping portions rolling on the 5,106, is provided.

Further, the ring gear gripping body 112 is fitted into the horizontal support shaft 117 of the traveling device main body 111 and is horizontally movable in the gripping direction, and the horizontal support shaft 117 is inserted into the horizontal support shaft 117, and the horizontal gripping cylinder 11 is inserted.
A spring 120 for urging 9 in the direction of moving away from the traveling device main body 111 and a tip end portion of a horizontal support shaft 117 are screwed together to prevent the gripping horizontal cylinder 119 from coming off, and the advancing and retracting of the gripping horizontal cylinder 119 Consists of an adjusting screw 121 for adjusting the distance from the traveling device main body 111, a gripping arm 122 hanging from a gripping horizontal cylinder 119, and a cam follower 123 which is a plurality of gripping parts attached below the gripping arm 122. Has been done.

On the side surface of the traveling device body 111 of the traveling device 110 opposite to the side where the drive gear 113 projects, a flat plate-shaped holder mounting slide 12 is provided.
5 is mounted so that it can move up and down. The holder mounting slide 125 is mounted by the drive gear 11 of the traveling device main body 111.
Dovetail groove 111a provided on the side surface opposite to the side where 3 projects
And a dovetail 125a provided on the side surface of the holder mounting slide 125
And are engaged. Between the upper side of one side of the holder mounting slide 125 and the lower side of the traveling device main body 111, there is provided a compression spring 126 that constantly urges the holder mounting slide 125 downward, that is, toward the surface to be measured. There is. Further, a notch knob 127 is rotatably provided at the upper end of the traveling device body 111,
A height holding notch 128 into which a part of the notch knob 127 fits is provided at a position above the side of the holder mounting slide body 125 opposite to the compression spring 126, and the notch knob 127 and the height holding notch are provided. A holder height holding mechanism 129 that holds the holder mounting slide body 125 at a predetermined height with respect to the traveling apparatus main body 111 is configured by the notch portion 128.

Further, the sensor holder 130 includes a U-shaped connecting arm 132 rotatably attached to the holder mounting slide body 125 via the first horizontal shaft 131, and a first horizontal shaft at both ends of the connecting arm 132. The sensor holder main body 134 is swingably supported by a second horizontal shaft 133 in a direction orthogonal to 131. A plurality of guide rollers 135 that are in rolling contact with the surface to be measured are provided below the sensor holder body 134. Further, a magnetostrictive sensor 140 is fixed to the sensor holder main body 134 with a set screw 136 so that a lower end surface 141 of the magnetostrictive sensor 140 holds a certain minute height h from the surface to be measured.

The present embodiment is configured as described above,
Next, the operation will be described.

First, the ring gear 100 is assembled and set at a measurement position on the outer peripheral surface 11 of the cylindrical material 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 that a ring is formed by surrounding the outer peripheral surface of a cylindrical material 1, and each clamp screw 107 of one ring gear segment 101 is connected to the other ring gear segment. The ring gear 100 is inserted through each clamp support plate 108 of the 101, and the clamp nut 109 is manually tightened to the clamp screw 107 to connect the two ring gear segments 101 to each other to form the ring gear 100.
Is set in the cylindrical material 1. Next, the traveling device 110 is installed on the ring gear 100. In this case, first, the notch knob 127 provided on the upper end of the traveling device body 111 is rotated,
A part of the notch knob 127 is fitted into a height holding notch 128 provided above a side portion of the holder mounting slide body 125, and the holder mounting slide body 125 having the sensor holder 130 mounted thereon is attached to the traveling device main body 111. On the other hand, the magnetostrictive sensor 140 held at a predetermined height and held by the sensor holder 130 is floated above the ring gear 100. By doing so, the magnetostrictive sensor 140 does not hit the outer peripheral surface 11 of the cylindrical material 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 set to the ring gear 100.
The outer teeth 104 attached to one of the vertical rail portions 103 are engaged with each other. Further, the ring gear gripper 112 grips the ring gear 100 with the traveling device main body 111. 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 the plurality of cam followers 123 attached to the holding arm 122 of the ring gear holding body 112. Is brought into rolling contact with the upper and lower tapered surfaces 105, 106 on the other side of the horizontal rail portion 102 of the ring gear 100. Then, the adjusting screw 121 is screw-operated to move the gripping horizontal cylinder 119 integrated with the gripping arm 122 to the traveling device main body 111 side to move the traveling device main body.
The cam follower 118 of 111 and the cam follower 123 of the ring gear grip body 112 grip the upper and lower tapered surfaces 105 and 106 on both sides of the horizontal rail portion 102 of the ring gear 100 under pressure. Therefore, the traveling device 110 does not fall off from the ring gear 100, and the cam followers 118 and 123 rotate and are guided by the ring gear 100, enabling traveling.

When traveling the traveling device 110 installed in the ring gear 100, if the notch knob 127 is rotated to eliminate the engagement with the height retaining notch 128, the holder 125 is released from the height retention and compressed. The holder mounting slide body 125 urged downward by the spring 126 descends, and the guide roller 135 provided on the sensor holder body 134 of the sensor holder 130 mounted on the holder mounting slide body 125 is made of a cylindrical material. It contacts the outer peripheral surface 11 of 1. Moreover, the sensor holder main body 134 is attached to the holder mounting slide body 125 via the first horizontal shaft 131, and the first horizontal shaft 131 is attached to the connecting arm 132.
Since it is pivotally supported by a second horizontal shaft 133 that is orthogonal to the first horizontal shaft 133,
The inclination in the direction parallel to the surface to be measured around 31 is automatically adjusted, and the sensor holder main body 134 is automatically adjusted in the direction perpendicular to the second horizontal axis 133. Further, the magnetostrictive sensor 140 is the sensor holder body 1 that is automatically adjusted in this way.
Since it is held vertically by 34 and is held at a constant height from the surface to be measured, the holding state does not change due to the subsequent movement of the sensor holder body 134.

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 columnar material 1. In this case, the servo motor
When the 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 that meshes with the drive gear 113, and the traveling device 110 travels on the ring gear 100. At this time, the cam follower 118 and the ring gear gripper 112 of the traveling device main body 111.
The cam follower 123 is the horizontal rail 102 of the ring gear 100.
The traveling device 110 travels while being guided by the horizontal rail portion 102 by rotating in a gripping state.
Orbit around it while being held in close contact with 1. Along with this, the sensor holder 130 also moves the magnetostrictive sensor 140 together with the traveling device 110 while maintaining the above holding relationship, so that the magnetostrictive stress measurement of the surface to be measured can be performed continuously without contact, and highly accurate measurement data can be obtained. Can be obtained.

After the measurement, even when the traveling device 110 is removed from the ring gear 100, the holder height holding mechanism 129 is operated as described above to hold the holder mounting slide body 125 at a predetermined height,
If removed, the traveling device 110 can be easily removed.

The direction and magnitude of the principal 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 1 for the traveling device main body 111
The holder 30 is mounted on the outer surface of the traveling device body 111 having a flat plate shape so as to be vertically movable.
Since the sensor holder 130 is mounted via 5 and the compression spring 126 for constantly urging the holder mounting slide body 125 downward is provided on the side of the holder mounting slide body 125, the height of the traveling device 110 is increased. Is substantially determined by the height of the traveling device main body 111 and is low.

[Effects of the Invention] As described above, the present invention assembles a ring gear at the measurement position on the outer peripheral surface of a cylindrical material, and engages the drive gear of the traveling device body with the outer teeth of the ring gear to adjust the distance from the traveling device body. The ring gear gripper can be installed on the ring gear so that the ring gear can be gripped with the main body of the traveling device, and is vertically movably attached to the traveling device via the holder mounting slide body and is always urged downward. The sensor holder vertically holds the magnetostrictive sensor at a certain height from the surface to be measured, and when the traveling device moves along the ring gear due to the drive gear being rotated by the drive of the motor, the traveling device is accompanied by the holder. The magnetostrictive sensor mounted through the mounting slide and the sensor holder is perpendicular to the surface to be measured and is held at a constant height above the surface to be measured. Since it is rotated, the magnetostrictive stress can be continuously measured on the surface to be measured of the cylindrical material in the circumferential direction without contact, and the traveling device body has external teeth that mesh with the drive gear. Since it travels on a ring gear, it has the effect of miniaturizing the motor as compared to the case where it is traveled by a conventional chain, without damaging the outer peripheral surface of the columnar material and without axial displacement. Further, since the holder mounting slide body to which the sensor holder is attached is vertically movably mounted on the outer surface of the traveling device body, the height of the traveling device is approximately equal to the height of the traveling device body. The height is also reduced, and the size can be reduced. Also,
Since the ring gear on which the traveling device travels is assembled and mounted on the outer peripheral surface of the cylindrical material, installation on site,
It has the effect of being easy to remove.

Furthermore, a holder height holding mechanism that holds the holder mounting slide body at a predetermined height with respect to the traveling device body is provided, and the holder height holding mechanism is operated when the traveling device is attached to or removed from the ring gear. By holding the holder mounting slide at a predetermined height with respect to the traveling device body, the magnetostrictive sensor held by the holder mounting slide via the sensor holder is lifted, and the magnetostrictive sensor is made of a cylindrical material. There is also an effect that the traveling device can be easily attached to and removed from the ring gear without hitting the outer peripheral surface.

[Brief description of drawings]

1 is a longitudinal side view showing an embodiment of the present invention, FIG. 2 is a plan view of a magnetostrictive stress measuring device, FIG. 3 is another longitudinal side view of a magnetostrictive stress measuring device, and FIG. 4 is a magnetostrictive stress measuring device. FIG. 5 is a vertical sectional side view showing a state where the sensor holder of FIG. 6 is lifted, FIG. 5 is a vertical sectional view showing a conventional magnetostrictive stress measuring device, FIG. 6 is a side view showing a portion of a carrying device, and FIG. It is a top view. 1 …… Cylinder material, 11 …… Outer peripheral surface, 100 …… Ring gear, 1
04 …… External teeth, 110 …… Travel device, 111 …… Travel device main unit,
112 …… Ring gear gripper, 113 …… Drive gear, 116 ……
Servo motor, 117 …… Horizontal support shaft, 118 …… Cam follower (grasping part), 123 …… Cafollower (grasping part), 125 ……
Holder mounting slide, 130 …… Sensor holder, 140 …… Magnetic strain sensor.

Continuation of the front page (72) Inventor Sadaaki Sakai Nihon Steel Pipe Co., Ltd. 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (56) References

Claims (1)

[Scope of utility model registration request] 1. A flat plate type traveling device main body having a ring gear having external teeth mounted on an outer peripheral surface of a columnar material, and a motor for axially supporting a drive gear meshing with the external teeth of the ring gear and for driving the drive gear. And a ring gear having a grip portion that is mounted on the side surface of the traveling device body on the drive gear side so as to be movable and adjustable in distance and that grips the ring gear with the grip portion provided on the traveling device body. The traveling device consisting of a grip body, the holder mounting slide mounted on the side of the traveling device main body opposite to the drive gear so as to be vertically movable, and the holder mounting slide with respect to the traveling device main body at a predetermined height. A holder height holding mechanism, a sensor holder mounted on the outer surface of the holder mounting slide, and a magnetostrictive sensor held vertically on the sensor holder at a constant height from the surface to be measured. Ete becomes possible magnetostrictive stress measuring device according to claim.