JP3387778B2 - Contact type sensor for external inspection of cylindrical workpieces - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inspects an outer peripheral shape of a cylindrical work deformed into an elliptical shape or the like in a manufacturing process of a cylindrical work such as a steel pipe. The present invention relates to a contact type sensor for inspecting the outer shape of a cylindrical work used for automatically correcting the outer shape of a cylindrical work to a predetermined perfect circular shape based on an inspection result. 2. Description of the Related Art As a sensor for inspecting the outer shape of a cylindrical work such as a steel pipe, a non-contact type sensor such as a laser sensor has conventionally been generally used. When a contact-type sensor is used, the outer peripheral surface of the cylindrical workpiece has very fine irregularities or irregular irregularities, or is in a state where various hues are mixed. If the element has an element, a measurement error is caused, and the inspection accuracy becomes very poor. Therefore, instead of a non-contact type sensor, a contact roller is provided which can contact the outer peripheral surface of the cylindrical work, and the contact roller is rotated around the work while being pressed against the outer peripheral surface of the work. At this time, it is also possible to use a contact type sensor that detects the amount of deformation of the outer peripheral surface of the cylindrical work by detecting the amount of movement of the roller supporting portion that moves in the radial direction according to the deformation of the outer peripheral surface of the work. Conventionally known. However, in the contact type sensor conventionally used, a contact roller serving as a tip contact has a cylindrical peripheral surface having the same diameter over the entire length in the axial direction. It was formed into a form. Therefore, in order to accurately detect the amount of deformation of the outer peripheral surface of the work,
It is necessary to press the contact roller so that the entire area of the cylindrical peripheral surface is in close contact with the outer peripheral surface of the workpiece.To clear this condition, the positioning accuracy of the cylindrical workpiece must be extremely high. As a result, it is necessary to install a very complicated and elaborate work positioning device as a work positioning device, resulting in a problem that the entire inspection device becomes very expensive. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a cylinder capable of accurately and efficiently detecting the amount of deformation of the outer peripheral surface of a work while enabling the positioning accuracy of a cylindrical work to be set loosely. It is an object of the present invention to provide a contact type sensor for shape inspection of a shaped work. In order to achieve the above object, according to the present invention, there is provided a contact sensor for inspecting the outer shape of a cylindrical work, comprising: a contact roller capable of contacting an outer peripheral surface of the cylindrical work; A roller support that supports the contact roller so as to be linearly movable and displaceable in the radial direction of the cylindrical work, and presses and biases the contact roller toward the outer peripheral surface of the cylindrical work via the roller support. A pressing urging mechanism, and the roller supporting unit when rotating the contact roller pressed and urged toward the outer peripheral surface side of the cylindrical work by the urging force of the pressing urging mechanism around the cylindrical work. Means for detecting the amount of displacement in the radial direction to detect the amount of deformation of the outer peripheral surface of the cylindrical work, wherein the contact roller has an axial direction. Is characterized in that it has an annular sharp projection formed at one end of the first portion and a columnar portion having a smaller diameter and a wider width in the axial direction. According to the contact type sensor for inspecting the outer shape of a cylindrical work having the above-described configuration, when inspecting the outer shape of, for example, a flange portion having a small width in the axial direction, on the outer peripheral surface of the cylindrical work, the contact roller is not used. By pressing a wide columnar portion of the peripheral surface against the outer peripheral surface of the work and rotating the work around the work, it is possible to accurately detect the deformation amount of the outer peripheral surface portion which is wide in the axial direction at once, and When inspecting the outer shape of the outer peripheral surface portion having a very large width in the axial direction, the annular sharp projection portion of the contact roller peripheral surface is locally pressed against the outer peripheral surface of the work and rotated around the work to rotate the work. It is possible to detect the amount of deformation of the outer peripheral surface by dividing it linearly, so that the inspection of each part can be performed accurately and as efficiently as possible even if the positioning accuracy of the cylindrical work is somewhat poor. It is possible to 's. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view showing the overall layout of a work straightening device including a contact sensor for contour inspection of a cylindrical workpiece according to the present invention, and FIG. 2 is a schematic plan view thereof. Broadly speaking, as an example of a cylindrical work, a pipe W having a large-diameter flange portion W2 on one end side in the axial direction of a straight pipe portion W1 is defined by a center line CL.
A traveling vehicle 2 that reciprocates in the direction of the center line CL along a fixed horizontal path constituted by a horizontal rail 1 while receiving and supporting the vehicle in a horizontal posture, and along a traveling direction of the traveling vehicle 2 The apparatus comprises an automatic tube shape correcting device 3 and a device W for checking the shape of a tube W which are arranged side by side in the proximity state. The traveling vehicle 2 is provided with a frame 6 supporting a pair of left and right traveling wheels 5 and 5 which are re-transferred to the rail 1 at the front and rear, respectively, and a pair of right and left at each of the front and rear positions of the frame 6. A pair of front and rear elevating frames 8, 8 connected to the underframe 6 via the hydraulic lifters 7, 7 so as to be able to move up and down.
And a pair of left and right tube receiving and supporting rollers 10 and 10 rotatably supported via bearings 9 and 9, and the traveling wheels 5 and 5 can be rotationally driven via an endless transmission such as a chain. The driving motor 11 for driving the vehicle and one of the rollers 10 and 10 for supporting and supporting the pipes at the time of automatic correction of the pipe ellipse to be described later rotate the pipes 10 and 10 supported on the rollers 10 and 10. And a tube rotating motor 12 for rotating the body W about its center line CL. The automatic tubular body shape correcting device 3 includes a fixed frame 13 fixedly installed so as to allow the traveling carriage 2 to pass therethrough and having a gate-shaped front view, and a pair of left and right vertical portions of the fixed frame 13. It is configured to be vertically drivable via a hydraulic cylinder 15 housed in a vertical position in a pit 14 formed in a basement portion corresponding to a central position between the frame portions 13a, 13a. The support member 16 for correcting the tube body, which comes into contact with the portion from below, and the upper portion between the pair of left and right vertical frame portions 13a, 13a of the fixed frame member 13 are spaced apart in the circumferential direction at the center of the circle. A plurality of pipe outer shape correction units which are arranged so as to be able to be driven back and forth and press the outer peripheral surface of the pipe body W when the pipe W is advanced toward the center line CL based on inspection data by the outer shape inspection device 4 described later. A pressing tool 17 is provided. The outer shape inspection apparatus 4 for the tubular body W is configured as shown in FIG. That is, a circle having a cutout portion 19 extending partly in the circumferential direction, specifically, a range of a central angle of 90 °, is provided on a fixed frame 18 in a front view portal shape fixedly installed so as to allow the carriage 2 to pass therethrough. As shown in FIGS. 4 and 5, the annular rotating frame 20 has an annular LM rail 21 whose lower part is cut out at a central angle of 90 ° and is fixed to the fixed frame 18. 21 is also rotatably supported around its center via a plurality of sliding pieces 22 fitted non-extractably. At a plurality of locations at equal distances in the circumferential direction of the annular rotating frame 20, specifically, at locations where the center angle is separated by a circumferential distance of every 90 °, the distance between the outer circumferential surface of the tubular body W Four contact-type sensors 23 for detecting the distance are mounted via a bracket 24 in a radial posture toward the rotation center of the rotating frame 20. A substantially rectangular shape in front view is provided at an outer peripheral portion of the annular rotary frame 20 at an upper and lower intermediate position of one of the pair of left and right vertical frame portions 18a, 18a of the gate-shaped fixed frame 18. 6 is fixed to the support frame 25, as shown in FIGS.
8 and 28 are arranged at the respective vertices of an isosceles triangle, and one of the sprockets 27 is directly connected to the output shaft 26a of the motor 26 with the cyclo-reduction gear.
The motor 6 is configured to be rotatable in the forward / reverse drive in accordance with the forward / reverse rotation switching of No. 6. The notch 1 is formed on the outer peripheral surface of the annular rotary frame 20.
Roller chain 29 having both ends fixedly locked at two places, a place close to one end side and a place distant in the circumferential direction therefrom.
In the middle of the three sprockets 28, 27, 28
With the above-described configurations, the annular rotating frame 20 is rotated at a central angle of 90 ° corresponding to the distance in the circumferential direction adjacent to the contact sensor 23 in accordance with the forward / reverse switching of the motor 26. A rotary drive mechanism for reciprocating rotary drive over the range is configured. In addition, one of the three sprockets 27, 28, 28
At the end of the rotating shaft 28a to which the
An encoder 30 for detecting a rotation angle of 0 is connected. Further, an overrun stopper for stopping rotation and an overrun stopper for stopping the origin are fixed to the outer peripheral portion of the annular rotating frame 20, and a contact member with which these stoppers abut is fixed to the fixed frame 18 side. However, illustration of these is omitted. Each of the contact type sensors 23 is configured as shown in FIGS. That is, a movable plate 35 (an example of a roller supporting portion) that rotatably supports a contact roller 34 serving as a contact with the outer peripheral surface of the tube W around its axis is composed of a hibonic gear motor 31 and a rack jack 32. Is linearly driven in the radial direction of the annular rotating frame 20 while being slid and guided by a guide shaft 36 and a slide shifter 37 disposed on both sides of the setup jack 33 via a setup jack 33 made of A cylinder 38 (an example of a pressing biasing mechanism) that is configured to be displaceable and that presses and biases the contact roller 34 against the outer peripheral surface of the tube W in a state of being displaced inward in the radial direction is provided. ing. The contact roller 34 has an annular sharp projection formed at one end in the axial direction so as to be pressed locally on the outer peripheral surface of the straight pipe W1 when the straight pipe W1 of the pipe W is inspected. 34a and a cylindrical portion 34b which is smaller in diameter than the annular sharp protrusion 34a and is wider in the axial direction so as to be pressed against the entire outer peripheral surface of the flange portion W2 when inspecting the flange portion W2 of the tubular body W. Is configured. A lower part of the cylinder 38 is provided with a potentiometer 39 (an example of a deformation detecting means) for detecting the amount of radial movement of the contact roller 34, which is detected by the potentiometer 39. The outer peripheral surface shape and the deformation amount of the tubular body W are calculated by taking in the radial movement amount of the contact roller 34 and the rotation angle of the annular rotating frame 20 detected by the encoder 30,
A personal computer (not shown) is provided for storing the calculation results as inspection data and outputting the stored inspection data as the operation amounts of the plurality of tubular body shape correcting pressing tools 16 in the automatic tubular body shape correcting device 3. . Next, the operation of the external inspection / correction equipment for a tubular body configured as described above will be briefly described. First, the flange portion W2 is placed on the tube receiving and supporting rollers 10, 10 of the traveling vehicle 2.
The receiving body W is received and supported so that its center line CL is in a horizontal posture, and is then moved along the traveling carriage 2 and the rail 1 in the direction of arrow x in FIG.
Is fixed to the portal-shaped fixed frame 1 in the automatic tube shape correcting device 3.
3 and dive and pass. When the flange portion W2 of the pipe W reaches the position immediately below the notch portion 19 of the gate-shaped fixed frame 18 and the annular rotary frame 20 in the external shape inspection device 4, the traveling movement of the traveling vehicle 2 is started. Stop. By raising the pair of front and rear lifting frames 8, 8 via the hydraulic lifters 7, 7 while the traveling vehicle 2 is stopped, the pipe W supported and received on the rollers 10, 10 is supported. The center line CL of the ring-shaped rotating frame 2
0 is set to a predetermined inspection state by being raised so as to coincide with the center of zero, and the setup jack 33 in the external shape inspection device 4 is operated to make four contact-type arrangements arranged at equal intervals in the circumferential direction. The sensor 23 is linearly driven and displaced radially inward of the annular rotating frame 20, and the cylindrical portion 34 b of the contact roller 34 in each contact type sensor 23 is Press the entire outer peripheral surface of the flange portion W2. Subsequently, the motor 26 with the cyclo reducer in the outer shape inspection apparatus 4 is operated to move the annular rotary frame 20 through the three sprockets 28, 27, 28 and the roller chain 29 so that the center angle of the annular rotary frame 20 is 90 °. When rotated in the direction of arrow a in FIG. 3 over the range, the columnar portion 34b of the tip contact roller 34 in each of the contact type sensors 23 rotates while being pressed against the outer peripheral surface of the flange portion W2 of the tube W. Moving. The rotation angle of the annular rotating frame 20 at the time of rotational driving is detected by the encoder 30 and the detected value is taken into the personal computer. When the sensor 23 rotates, the contact rollers 34 move individually in the radial direction in accordance with the deformation of the outer peripheral surface of the flange portion W2, and the amount of movement of the contact rollers 34 in the radial direction is determined by the potentiometer 39. And the detected value is taken into the personal computer. Then, an inspection is performed to determine the amount of deformation in the flange portion W2 of the tubular body W and the overall shape of the outer peripheral surface by calculating the detected values. When the inspection of the flange portion W2 of the tubular body W is completed, the motor 26 with the cyclo-reduction device is rotated in the reverse direction, and the annular rotation is performed via three sprockets 28, 27, 28 and a roller chain 29. The frame 20 is rotated in the direction indicated by the arrow b in FIG. 3 over a range of the central angle of 90 ° to return to the original rotation position, and the setup jack 33 is operated in the reverse direction so that the four contact types are operated. The sensor 23 is driven and displaced linearly outward in the radial direction of the annular rotary frame 20 to set a detection standby posture. Next, the traveling carriage 2 is slightly moved in the direction of the arrow x so that a part of the straight pipe portion W1 of the tubular body W is cut out of the portal-shaped fixed frame 18 and the annular rotary frame 20 in the outer shape inspection device 4. 19
The traveling movement of the traveling vehicle 2 is stopped when the traveling vehicle 2 reaches the position immediately below the traveling vehicle. While the traveling vehicle 2 is stopped, the setup jack 33 is reactivated and the four contact sensors 2
3 is linearly driven and displaced radially inward of the annular rotating frame 20, and the annular sharp projection 34 a of the contact roller 34 of each contact type sensor 23 is It is pressed locally on the outer peripheral surface of the straight pipe portion W1. Thereafter, as in the case of the inspection of the flange portion W2, the motor 26 with the cyclo reducer is operated to move the annular rotary frame 20 through the three sprockets 28, 27, 28 and the roller chain 29. Rotation is performed in the direction of arrow a in FIG. 3 over a range of the central angle of 90 ° to press the sharp projection 34a of the tip contact roller 34 in each of the contact type sensors 23 against the outer peripheral surface of the straight pipe W1 of the pipe W. While rotating, the rotary angle of the annular rotary frame 20 at this time is detected by the encoder 30 and the detected value is taken into the personal computer. During the rotational movement of the contact 23, the amount of movement of each contact roller 34 in the radial direction according to the deformation of the outer peripheral surface of the straight pipe portion W1 is detected by the potentiometer 39, and the detected value is detected as described above. Incorporated Sokon, inspection so as to determine the amount of deformation and the overall outer peripheral surface shape of the straight pipe portion W1 of the tube W is performed by the calculation of their both detection values. By repeating the same operation as described above while moving and stopping the traveling vehicle 2 to a preset position, the inspection for determining the deformation amount and the outer peripheral surface shape of the straight pipe portion W1 of the pipe W is performed. This can be performed over the entire length, and as a result, the personal computer stores the data of the deformation amount and the outer peripheral surface shape of each part of the tubular body W. After the outer shape inspection is completed at each part of the entire length of the tube W as described above, the traveling carriage 2 is set in advance with respect to the portal fixed frame 13 in the automatic tube shape correcting device 3. The tube W is moved and stopped by the amount, and at the stop position, one of the tube receiving and supporting rollers 10 is rotationally driven via the tube rotating motor 12 to move the tube W at a predetermined angle around its center line CL. While rotating each time, the support 16 for correcting the tubular body and the plurality of pressing tools 1 for correcting the tubular ellipse
7 is operated on the basis of the inspection data stored in the personal computer, so that the pipe W
Is automatically and properly corrected. In particular, while the tube W is fixedly supported,
By rotating the four contact-type sensors 23 arranged at equal intervals around the tube W around the tube W, the deformation amount and shape of each of the outer peripheral surface portions of the tube W divided into four in the circumferential direction are determined. (A) of FIG.
(B) Even if the tube W is deformed as in (C) or the like, the amount of deformation and the shape of the entire outer peripheral surface are accurately inspected, and the tube W is automatically corrected after the inspection. It is possible to obtain necessary inspection data. The contact roller 34 of the contact sensor 23
The annular sharp protrusion 34a pressed locally on the outer peripheral surface of the straight pipe W1 of the pipe W and the large-diameter flange W of the pipe W
2 having a wide columnar portion 34b pressed against the entire outer peripheral surface, it is possible to accurately inspect each part even if the positioning accuracy of the tubular body W is somewhat poor. This has the advantage that the positioning accuracy of the tube W can be set loosely. In the above embodiment, the description has been given of a case where the cylindrical workpiece is a pipe with a flange. However, the present invention can also be applied to the outer shape inspection of a solid cylindrical workpiece. As described above, according to the present invention,
Due to the contact type sensor, the outer peripheral surface of the cylindrical workpiece has very fine irregularities or irregular irregularities, or is in a state where various hues are mixed, in short, disturbance Even with a contact roller, there is no error caused by those disturbance elements, and the reliability of inspection accuracy can be improved. By selectively using the columnar portion and the annular sharp projection, the deformation amount of each portion of the outer peripheral surface of the work can be detected as efficiently and accurately as possible, while setting the positioning accuracy of the work loosely. Therefore, it is not necessary to use a particularly complicated and elaborate device as a work positioning device, so that it is easy to simplify the structure of the entire inspection device and to reduce the cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing an overall layout of a work straightening facility including a contact type sensor for inspecting the outer shape of a cylindrical work according to the present invention. FIG. 2 is a schematic plan view of FIG. FIG. 3 is an enlarged front view of the outer shape inspection device for a tubular body. FIG. 4 is an enlarged front view of a main part of FIG. 3; FIG. 5 is a sectional view taken along line AA of FIG. 4; 6 is an enlarged cross-sectional plan view of a main part along line BB in FIG. 3; FIG. 7 is an enlarged side view of a main part along the line CC in FIG. 3; FIG. 8 is an enlarged vertical sectional view of a main part taken along line DD of FIG. 3; FIG. 9 is an enlarged front view of the contact sensor. 10 is a view as seen from the direction of arrows EE in FIG. 9; FIG. 11 is a sectional view taken along line FF of FIG. 9; FIGS. 12A, 12B, and 12C are front views of the tubular body in various deformed states, respectively. [Description of Signs] 23 Contact type sensor 34 Contact roller 34a Annular sharp protrusion 34b Columnar portion 35 Movable plate (example of roller support) 38 Cylinder (example of pressing and urging mechanism) W Tube (example of cylindrical workpiece) )

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Kawahara 2-26, Ohama-cho, Amagasaki-shi, Hyogo Co., Ltd. Inside the Kubota Mukogawa Plant (72) Inventor Toshikazu Nakashima 2-26, Ohama-cho, Amagasaki-shi, Hyogo Kubota, Inc. Inside the Mukogawa Works (56) References JP-A-8-141643 (JP, A) JP-A-11-10232 (JP, A) JP-A 63-92209 (JP, U) (58) Fields investigated (Int. Cl ^7, DB name) G01B 21/00 -. 21/32 G01B 5/00 - 5/32 G01B 7/00 - 7/34

Claims (1)

(1) A contact roller capable of contacting an outer peripheral surface of a cylindrical work, and a roller supporting the contact roller so as to be linearly movable and displaceable in a radial direction of the cylindrical work. A supporting portion; a pressing urging mechanism for pressing the contact roller against the outer peripheral surface side of the cylindrical work via the roller supporting portion; and an outer peripheral surface of the cylindrical work by the urging force of the pressing urging mechanism. Means for detecting the amount of radial movement of the roller support when rotating the contact roller urged against the side around the cylindrical work to detect the amount of deformation of the outer peripheral surface of the cylindrical work A contact-type sensor for inspecting the outer shape of a cylindrical work, comprising: an annular sharp projection formed at one end in the axial direction thereof; and a circle having a diameter smaller than that and wider in the axial direction. With columnar part A contact-type sensor for inspecting the outer shape of a cylindrical work, wherein the contact-type sensor is configured to be configured as follows.