JP2010190622A - Dimension measuring device of pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dimension measuring device of a pipe body that is applicable for a pipe body with a small inner diameter and accurately measures the dimension. <P>SOLUTION: This dimension measuring device 1 of the pipe body calculates the dimension of the pipe body 10 arranged so that the axis P1 is substantially parallel with the horizontal direction. The dimension measuring device includes contact bodies 6a and 6b having pedestals 61a and 61b movable with respect to the axis of the pipe body, arms 62a and 62b extending in the axial direction from the pedestals, and contacts 63a and 63b that are attached to the tips of the arms and slidable on the peripheral surface of the pipe body. The dimension measuring device 1 includes load adjusting means 8a and 8b for applying a load where the direction is the opposite to the direction of a movable component of the pedestals and the magnitude is substantially the same as that of the component, of the gravity acting on the contact bodies. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tubular body dimension measuring apparatus that measures the dimensions of a tubular body, and more particularly, to a tubular body dimension measuring apparatus that measures the dimensions of a tubular body that is arranged so that its axis is substantially parallel to the horizontal direction. .

  As such a tubular body dimension measuring apparatus, a tubular body dimension measuring apparatus as shown in FIG. 6 (hereinafter referred to as “first tubular body dimension measuring apparatus”) is known (see Patent Document 1). ). FIG. 6 is a cross-sectional view of the rotary head 201 provided in the first tubular body dimension measuring apparatus and the tubular body 100 whose dimensions are measured by the first tubular body dimension measuring apparatus. 6A shows a state where the rotary head 201 and the tube 100 are separated from each other, and FIG. 6B shows a contact 203b of the rotary head 201 inserted into the inner space of the tube 100. Indicates the state. As shown in FIG. 6A, the rotary head 201 includes a base 202, two contacts 203a and 203b, and two pressing means 204a and 204b. The base 202 is rotatable around a rotation center P12 that is substantially parallel to the horizontal direction. On the side surface of the base 202 on the tube body 100 side, pressing means 204 a and 204 b are attached along a direction orthogonal to the rotation center P <b> 12 of the base 202. The contact 203a is attached to the side of the pressing means 204a toward the rotation center P12, can move forward and backward with respect to the rotation center P12 of the base 202, and the contact 203b is away from the rotation center P12 of the pressing means 204b. It can be moved forward and backward with respect to the rotation center P12 of the base 202. It should be noted that being able to move forward and backward with respect to the rotation center P12 of the base 202 is capable of moving toward the rotation center P12 and moving (retreating) away from the rotation center P12. Means that.

  When measuring the dimensions of the tubular body 100 using the first tubular body dimension measuring device, first, as shown in FIG. 6A, the axial center P11 of the tubular body 100 and the rotation center P12 of the base 202 are used. To match. Next, the interval between the contact 203 a and the contact 203 b is made larger than the wall thickness of the tubular body 100. Then, the rotary head 201 is moved along the axis P11, and as shown in FIG. 6B, the contact 203b is inserted into the inner space of the tube 100, and between the contact 203a and the contact 203b. The tube body 100 is positioned. Next, the contact means 203a is advanced toward the rotation center P12 of the base 202 (the axis P11 of the tubular body 100) by the pressing means 204a, and the contactor 203a is applied to the outer peripheral surface 101 of the tubular body 100 with a predetermined load. Press. At the same time, the pressing means 204b causes the contact 203b to retreat from the rotation center P12 of the base 202 (the axis P11 of the tube 100), and the contact 203b is applied to the inner peripheral surface 102 of the tube 100 with a predetermined load. Press.

  Next, the base 202 is rotated around the rotation center P12. When the base 202 rotates, the contact 203a slides on the outer peripheral surface 101 in the circumferential direction, and the contact 203b slides on the inner peripheral surface 102 in the circumferential direction. When the contact 203 a slides on the outer peripheral surface 101, the position of the contact 203 a in the direction in which the contact 203 a can move forward and backward varies depending on the shape of the outer peripheral surface 101. Similarly, when the contact 203 b slides on the inner peripheral surface 102, the position of the contact 203 b in the direction in which the contact 203 b can move forward and backward varies depending on the shape of the inner peripheral surface 102.

  The first tubular body dimension measuring device is based on the positions of the contactors 203a and 203b in the direction in which the contactors 203a and 203b can move back and forth, such as the outer diameter and inner diameter of the tubular body 100. Calculate the dimensions.

  In order to measure the dimensions of the tubular body 100 using the first tubular body dimension measuring apparatus, the rotary head 201 is moved along the axis P11 as shown in FIG. Needs to be inserted into the inner space of the tube 100. As described above, the contact 203b is attached to the side away from the rotation center P12 of the pressing means 204b. For this reason, if the inner space does not have a size capable of inserting both the contactor 203b and the pressing means 204b when the rotary head 201 is moved along the axis P11, the contactor 203b is moved to the inner space. Can not be inserted into. Accordingly, the first tubular body dimension measuring apparatus cannot insert the contactor 203b into the inner space of the tubular body 100 having a small inner diameter, in which both the contactor 203b and the pressing means 204b cannot be inserted into the inner space. Can not be measured.

  As a tubular body dimension measuring apparatus for solving such a problem, a tubular body dimension measuring apparatus described below (hereinafter referred to as “second tubular body dimension measuring apparatus”) can be considered. FIG. 7 is a cross-sectional view of the rotary head 201 included in the second tubular body dimension measuring device and the tubular body 100 whose dimensions are measured by the second tubular body dimension measuring device. As shown in FIG. 7, the rotary head 201 of the second tubular body dimension measuring apparatus includes two contact bodies 205a and 205b. Each contact body 205a, 205b includes contacts 203a, 203b, pedestals 206a, 206b, and arms 207a, 207b. The pedestals 206a and 206b are attached to the base 202 so as to be movable back and forth with respect to the rotation center P12 of the base 202, and the forward and backward movement is performed by the pressing means 204a and 204b. The arms 207a and 207b extend from the pedestals 206a and 206b toward the tubular body 100, and contacts 203a and 203b are attached to the tip portions. In each of the contact bodies 205a and 205b, the contacts 203a and 203b, the bases 206a and 206b, and the arms 207a and 207b are configured to advance and retract integrally.

  When measuring the dimensions of the tubular body 100 using the second tubular body dimension measuring apparatus, the tubular body 100 is measured in the same manner as when measuring the dimensions of the tubular body 100 with the first tubular body dimension measuring apparatus. The tube center 100 is positioned between the contactor 203a and the contactor 203b by aligning the axis P11 of the shaft and the rotation center P12 of the base 202. Next, the pedestal 206a is advanced by the pressing means 204a toward the rotation center P12 of the base 202 (axial center P11 of the tubular body 100), and the pedestal 206a is brought into contact with the outer peripheral surface 101 while the contact 203a is in contact with the outer peripheral surface 101. It presses with the predetermined load toward the rotation center P12 of the base 202. At the same time, the pedestal 206b is retracted from the rotation center P12 (the axis P11 of the tubular body 100) of the base 202 by the pressing means 204b, and the pedestal 206b is brought into contact with the inner peripheral surface 102 in a state where the contact 203b is in contact with the inner peripheral surface 102. Press with a predetermined load in a direction retreating from the rotation center P12 of the table 202. Accordingly, the contact 203a is pressed against the outer peripheral surface 101 of the tube 100 with a predetermined load, and the contact 203b is pressed against the inner peripheral surface 102 of the tube 100 with a predetermined load.

  Next, the base 202 is rotated around the rotation center P12. Thereby, the contactor 203a slides on the outer peripheral surface 101 in the circumferential direction, and the contactor 203b slides on the inner peripheral surface 102 in the circumferential direction. When the contact 203 a slides on the outer peripheral surface 101, the position of the contact 203 a in the direction in which the pedestal 206 a can move forward and backward varies depending on the shape of the outer peripheral surface 101. Similarly, when the contact 203b slides on the inner peripheral surface 102, the position of the contact 203b in the direction in which the pedestal 206b can move forward and backward changes according to the shape of the inner peripheral surface 102. Since the contact 203a and the pedestal 206a are integrally moved forward and backward, the position of the pedestal 206a in the direction in which the pedestal 206a can move forward and backward (hereinafter referred to as “the position of the pedestal 206a” as appropriate) is on the outer peripheral surface 101. It varies depending on the shape. Further, since the contact 203b and the pedestal 206b move forward and backward integrally, the position of the pedestal 206b in the direction in which the pedestal 206b can move forward and backward (hereinafter referred to as “the position of the pedestal 206b” as appropriate) is the inner circumference. It varies depending on the shape of the surface 102. The second tubular body dimension measuring apparatus determines the dimensions of the tubular body 100 based on the positions of the pedestals 206a and 206b when the contacts 203a and 203b slide on the outer peripheral surface 101 and the inner peripheral surface 102. calculate.

  In the second tubular body dimension measuring apparatus having the above-described configuration, as shown in FIG. 7, the contacts 203a and 203b are attached to the distal ends of the arms 207a and 207b extending to the tubular body 100 side. For this reason, when the rotary head 201 is moved along the axis P11, the contact 203b can be inserted into the inner space of the tubular body 100 without inserting the pressing means 204b. Therefore, unlike the first tubular body dimension measuring apparatus, the second tubular body dimension measuring apparatus has an advantage that the dimensions can be measured even with the tubular body 100 having a small inner diameter. However, in recent years, the measurement accuracy required for the tube dimension measuring device has increased, and in view of this, the measurement accuracy of the second tube dimension measuring device may not necessarily be sufficient. .

JP 06-185937 A

  It is an object of the present invention to provide a tubular body dimension measuring apparatus that can be applied to a tubular body having a small inner diameter and that can measure dimensions with higher accuracy.

  In order to solve the above-mentioned problems, the inventors of the present invention have intensively studied. As a result, when the contacts 203a and 203b of the second tubular body dimension measuring apparatus slide on the outer peripheral surface 101 and the inner peripheral surface 102 ( Hereinafter, it is referred to as “during sliding” as appropriate. Each arm portion 207a, 207b bends in a direction in which each base 206a, 206b can move forward and backward, and the position of each base 206a, 206b is affected by the bending. I found out.

  As shown in FIG. 8, at the time of sliding, the tips of the arms 207a and 207b are in contact with the tubular body 100 via the contacts 203a and 203b. On the other hand, the base ends of the arms 207a and 207b (ends on the side of the bases 206a and 206b) are attached to the bases 206a and 206b that can move forward and backward. For this reason, as shown in FIG. 8, at the time of sliding, each arm 207a, 207b bends in the direction in which each base 206a, 206b can move forward and backward.

  The amount of bending of the arm 207a depends on the load F by which the pressing means 204a presses the pedestal 206a and the component W ′ in the direction in which the pedestal 206a can move forward / backward among the gravity acting on the contact body 205a (hereinafter referred to as “gravity” And the combined force (hereinafter referred to as “the combined force of the load F and the gravity component W ′” as appropriate).

  FIG. 9 is a diagram illustrating a combined force of the load F and the gravity component W ′. As described above, the direction of the load F that the pressing means 204a presses the pedestal 206a is a direction that proceeds toward the rotation center P12 of the base 202, and the magnitude of the load F is substantially constant (see FIG. 9 (a) and FIG. 9 (b)).

  On the other hand, the direction of the gravity component W ′ is determined from the axis P11 of the tube 100 when the pedestal 206a is positioned vertically below the axis P11 of the tube 100 as shown in FIG. It becomes the direction to retreat. Further, as shown in FIG. 9B, when the pedestal 206 a is positioned vertically above the axis P <b> 11 of the tube body 100, the direction is to proceed toward the axis P <b> 11 of the tube body 100. Furthermore, the magnitude of the gravity component W ′ is defined as follows: W is gravity acting on the contact body 205a, and θ2 is an acute angle formed by the straight line L11 connecting the axis P11 of the tube 100 and the pedestal 206a with the horizontal direction. Wsin θ2.

  From the above, when the pedestal 206a is positioned vertically below the axis P11 of the tube body 100, the magnitude of the combined force of the load F and the gravity component W ′ is (F−W sin θ2). . When the pedestal 206a is positioned vertically above the axis P11 of the tubular body 100, the magnitude of the combined force of the load F and the gravity component W ′ is (F + Wsin θ2).

  For this reason, the combined force of the load F and the gravity component W ′ increases in the direction of traveling toward the rotation center P2 of the base 202 as the pedestal 206a comes closer to the uppermost part of the outer peripheral surface 101 in the vertical direction. Become. As described above, the combined force of the load F and the gravity component W ′ varies depending on the position of the pedestal 206a in the circumferential direction of the tubular body 100. Therefore, the amount of deflection of the arm 207a varies during sliding.

  As described above, the position of the pedestal 206a is affected by the bending of the arm 207a, and the amount of bending of the arm 207a fluctuates when sliding. For example, a contact is formed on the outer peripheral surface of a completely circular tube. Even when 203a is slid, the locus of the position of the pedestal 206a is not a perfect circle. For this reason, an error occurs when the dimensions of the tubular body 100 are calculated based on the position of the base 206a.

  For the same reason, if the dimensions of the tubular body 100 are calculated based on the position of the base 206b, an error occurs.

  Therefore, the inventor of the present invention adds each load to the pedestals 206a and 206b with a load that cancels the gravity component W ′ that fluctuates the combined force of the load F and the gravity component W ′. It was found that the bending of 207a and 207b became constant, and the dimensions of the tubular body 100 could be accurately calculated based on the positions of the pedestals 206a and 206b. The inventor of the present invention has completed the present invention based on these new findings.

  The present invention relates to a rotary head arranged opposite to the axial direction with respect to a tubular body arranged so that its axial center is substantially parallel to the horizontal direction, and a dimension calculating means for calculating a dimension of the tubular body. The tubular head dimension measuring apparatus comprises: a rotary base that rotates about a rotation center substantially parallel to a horizontal direction; and the base that is movable back and forth with respect to the rotation center of the base. A contact body attached to the contact body, a pressing means for moving the contact body forward and backward to press the contact body against a peripheral surface of the tubular body, and a load in a direction in which the contact body can advance and retract. The contact body includes a pedestal attached to the base so as to be movable back and forth with respect to the center of rotation of the base, and extends from the base toward the tubular body, and is integrated with the base. Forward and backward movement and the front so that it can contact the peripheral surface of the tube A contact attached to the tip of the arm and moving forward and backward integrally with the arm; and the pressing means advances and retracts the pedestal until the contact contacts the peripheral surface of the tubular body, In a state where the contactor is in contact with the peripheral surface of the tubular body, a substantially constant load is applied to the pedestal in a direction in which the pedestal can advance and retreat regardless of the rotation angle of the base, and the load adjusting means Is applied to the pedestal with a load that is opposite in direction to the component in the direction in which the pedestal can move back and forth in the gravity acting on the contact body, and the size of the component is substantially the same. The dimensions of the tubular body are calculated based on the position of the pedestal in the direction in which the pedestal can advance and retract when the contactor slides on the peripheral surface of the tubular body by the rotation of the base. An apparatus for measuring a dimension of a tubular body is provided.

  The tubular body dimension measuring apparatus according to the present invention is opposite in direction to the component in the direction in which the pedestal can move forward and backward (hereinafter referred to as “gravity component” as appropriate) among the gravity acting on the contact body, and the gravity. Load adjusting means is provided for applying a load (hereinafter referred to as “adjustment load” as appropriate) having substantially the same size as the component to the pedestal. By adding such an adjustment load to the pedestal, the gravity component and the adjustment load are substantially canceled. As a result, the amount of bending of the arm when the contact is sliding on the peripheral surface of the tubular body becomes substantially constant, and the dimensions of the tubular body are accurately determined based on the position of the pedestal in the direction in which the pedestal can advance and retract. It can be calculated well. Therefore, the tubular body dimension measuring apparatus according to the present invention can measure the dimensions with higher accuracy.

  In the tubular body dimension measuring apparatus according to the present invention, as in the second tubular body dimension measuring apparatus, the contact is attached to the tip of the arm extending to the tubular body side. For this reason, since the contact can be inserted into the inner space of the tubular body without inserting a pressing means into the inner space of the tubular body, the tubular body dimension measuring apparatus according to the present invention has a small inner diameter. Even so, the dimensions can be measured.

  As a specific configuration of the load adjusting means, the load adjusting means includes a roller group composed of a plurality of rollers attached to the base along a direction in which the base can advance and retreat, and one end of the roller group. A first winding part that is wound around a roller located at one end and coupled to the pedestal, and a roller located at the other end of the roller group, and one end coupled to the pedestal. Two winding portions, and a counterweight coupled to the other ends of the first winding portion and the second winding portion, and having a weight substantially equal to the weight of the contact body, the first winding portion, A configuration in which a loop is formed by the counterweight, the second winding portion, the pedestal, and the roller group can be exemplified.

  Preferably, the tubular body dimension measuring apparatus according to the present invention includes the two contact bodies, and the pressing unit is configured to keep one of the contact bodies until the contact of the one of the contact bodies contacts the outer peripheral surface of the tubular body. The pedestal of the contact body is advanced toward the center of rotation of the base, and the contact of one of the contact bodies is in contact with the outer peripheral surface of the tubular body regardless of the rotation angle of the base. Applying a substantially constant load to the base of one of the contact bodies toward the center of rotation of the base, and until the contact of the other contact body contacts the inner peripheral surface of the tubular body With the base of the contact body retracted from the center of rotation of the base, the contact of the other contact body is in contact with the inner peripheral surface of the tubular body, regardless of the rotation angle of the base, The platform of the other contact body is subjected to a substantially constant load in a direction retreating from the center of rotation of the platform. In addition, the load adjusting means is opposite in direction to the component of the gravitational force acting on one of the contact bodies in the direction in which the pedestal of the one of the contact bodies can move back and forth, and the magnitude of the component Applies substantially the same load to the pedestal of one of the contact bodies, the direction of the gravity component acting on the other contact body is opposite to the direction component of the other contact body in which the pedestal can move forward and backward, In addition, a load having substantially the same size as the component is applied to the pedestal of the other contact body, and the dimension calculating means causes the outer peripheral surface of the tubular body to be moved to the one of the contact bodies by the rotation of the base. When the contactor slides and the contactor of the other contact body slides on the inner peripheral surface of the tubular body, the contact of the pedestal of the one contact body in the direction in which the base can move back and forth. While calculating the outer diameter of the tubular body based on the position of the pedestal, the other contact body Calculate the inner diameter of the tube based on the position of the pedestal in the direction in which the pedestal can advance and retract, and output the calculated outer diameter and inner diameter of the tube, or calculate the outer diameter of the tube and The thickness of the tubular body calculated based on the inner diameter is output.

  In such a preferred configuration, two contact bodies are provided. Each pedestal of one contact body and the other contact body is pressed in a direction to advance toward or away from the rotation center of the base, whereby the contact of one contact body is pressed against the outer peripheral surface. Then, the contact of the other contact body is pressed against the inner peripheral surface. Therefore, when the base is rotated around the center of rotation, the contact of one contact body slides on the outer peripheral surface, and the contact of the other contact body slides on the inner peripheral surface. In addition, an adjustment load that is opposite in direction and in the same direction as the component in the direction in which each pedestal can move forward and backward is applied to the pedestal of each contact body. Added by means. Therefore, according to such a preferable configuration, the outer diameter of the tube body can be accurately calculated based on the position of the pedestal in the direction in which the pedestal of one contact body can advance and retreat, and the pedestal of the other contact body can advance and retract. The inner diameter of the tube can be accurately calculated based on the position of the pedestal in any direction.

  Preferably, the two contactors are attached so that the directions in which they can advance and retreat are coincident, and the pressing means connects the base of one of the contact bodies and the base of the other contact body. It is supposed to be configured.

  When the direction in which the pedestal of one and the other contact body can move forward and backward matches, the pedestal of one contact body is directed toward the center of rotation of the base until the contact of the one contact body contacts the outer peripheral surface of the tube. And the direction in which the pedestal of the other contact body retreats from the center of rotation of the base until the contact of the other contact body contacts the inner peripheral surface of the tube body. Also, in a state where the contact of one contact body is in contact with the outer peripheral surface of the tube body, the direction in which the base of one contact body is pressed toward the center of rotation of the base, and the contact member of the other contact body is the tube The direction in which the pedestal of the other contact body is pressed in the direction of retreating from the center of rotation of the base while being in contact with the inner peripheral surface of the body is opposite. By moving the pedestal forward and backward and pressing in the opposite direction between the pedestals of the one and the other contact bodies, the forward and backward movement and pressing can be expanded and contracted in, for example, a uniaxial direction. This can be done with one member. For this reason, according to this preferable structure, a press means can be comprised by one member and the number of parts of the dimension measuring apparatus of the tubular body which concerns on this invention can be suppressed.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a tubular body having a small inner diameter and can provide a tubular body dimension measuring apparatus capable of measuring dimensions with higher accuracy.

FIG. 1 is a side view of a tubular body whose dimensions are measured by the tubular body dimension measuring apparatus of the present embodiment and the tubular body dimension measuring apparatus of the present embodiment. FIG. 1A shows a state in which the tubular body dimension measuring device and the tubular body are separated from each other. FIG. 1B shows a part of the tubular body dimension measuring apparatus and the side surface of the tubular body in a state where the contact of the tubular body dimension measuring apparatus is inserted into the inner space of the tubular body. FIG. 2 is a diagram showing a configuration in the vicinity of the tip of the base of the tubular body dimension measuring apparatus. Fig.2 (a) is an enlarged side view of the front-end | tip part vicinity in the arrow G of FIG. FIG. 2B is an enlarged plan view of the vicinity of the tip of the base. FIG. 2C is an XX end view of FIG. FIG. 2D is a YY end view of FIG. FIG. 3 is a schematic view for explaining that the adjustment load is opposite in direction to the gravity component and substantially the same size. FIG. 4 is a cross-sectional view of a tubular body used in Examples and Comparative Examples. FIG. 5 is a graph showing a deviation between the measured values of Examples and Comparative Examples and actual dimensions. FIG. 6 is a cross-sectional view of a rotating head included in the first tubular body dimension measuring device and a tubular body whose dimensions are measured by the first tubular body dimension measuring device. FIG. 6A shows a state where the rotary head and the tube are separated from each other. FIG. 6B shows a state in which the contact of the rotary head is inserted into the inner space of the tubular body. FIG. 7 is a cross-sectional view of a rotary head provided in the second tubular body dimension measuring device and a tubular body whose dimensions are measured by the second tubular body dimension measuring device. FIG. 8 shows an arm included in the second tubular body dimension measuring device in a state where the pedestal is bent in a direction in which the base can be advanced and retracted. FIG. 9 is a diagram illustrating a combined force of a load and a gravity component. FIG. 9A shows the combined force of the load and the gravity component when the pedestal is positioned vertically below the axis of the tube. FIG. 9B shows the combined force of the load and the gravity component when the pedestal is positioned vertically above the axis of the tube body.

  Hereinafter, an embodiment of a tubular body dimension measuring apparatus according to the present invention will be described with reference to the accompanying drawings as appropriate. FIG. 1 is a side view of a tubular body dimension measuring device 1 of the present embodiment and a tubular body 10 whose dimensions are measured by the tubular body dimension measuring device 1 of the present embodiment. FIG. 1A shows a state in which the tubular body dimension measuring apparatus 1 and the tubular body 10 are separated from each other. FIG. 1B shows a part of the tubular body dimension measuring device 1 and the side surface of the tubular body 10 in a state where the contact 63 a of the tubular body dimension measuring device 1 is inserted into the inner space of the tubular body 10. Show. The tube body 10 is disposed such that the axis P1 is substantially parallel to the horizontal direction.

  The tubular body dimension measuring device 1 includes a main body 2, a rotary head 3, and a dimension calculating means (not shown).

  The main body 2 is arranged so as to be movable along a travel axis 20 parallel to the axis P1 of the tubular body 10. The main body 2 supports the rotary head 3 so that the rotary head 3 is disposed to face the tube body 10 in the direction of the axis P1. Furthermore, the main body 2 includes a lifting shaft 21 extending in the vertical direction. The elevating shaft 21 can be constituted by a screw screw.

  FIG. 2 is a diagram showing a configuration in the vicinity of a distal end portion 52 (described later) of the base 5 of the tubular body dimension measuring apparatus 1. 2A is an enlarged side view of the vicinity of the tip portion 52 of the base 5 in the direction of arrow G in FIG. 1, and FIG. 2B is an enlarged plan view of the vicinity of the tip portion 52 of the base 5. 2 (c) is an XX end view of FIG. 2 (a), and FIG. 2 (d) is a YY end view of FIG. 2 (a). As shown in FIGS. 1 and 2, the rotary head 3 includes a drive motor 4, a base 5, two contact bodies 6a and 6b, a pressing means 7, and two load adjusting means 8a and 8b. .

  As shown in FIG. 1A, the base 5 is rotatable around a rotation center P2 that is substantially parallel to the horizontal direction. The base 5 includes a proximal end portion 51 and a distal end portion 52. The base end portion 51 is rotationally driven by the drive motor 4, and when the base end portion 51 rotates, the base 5 rotates around the rotation center P2. The base end portion 51 is attached to the lifting shaft 21. The base end portion 51 can be moved up and down (moved in the vertical direction) by rotating the lifting shaft 21, and the base end portion 51 can be moved up and down to adjust the vertical position of the rotation center P <b> 2 of the base 5. it can. The base end portion 51 includes a radius adjustment shaft 53 that extends in a direction in which the base end portion 51 can advance and retract. The radius adjusting shaft 53 can be configured by a screw screw.

  The distal end portion 52 is located on the tube body 10 side of the proximal end portion 51 and is attached to the radius adjusting shaft 53. The distal end 52 moves forward and backward with respect to the rotation center P <b> 2 of the base 5 by rotating the radius adjustment shaft 53. The ability to move forward and backward with respect to the rotation center P2 of the base 5 means that the head 5 can move toward the rotation center P2 of the base 5 and can retreat from the rotation center P2 of the base 5. To do. As shown in FIG. 2 (b), the tip 52 is formed in a U-shape in plan view.

  As shown in FIG. 1A, the two contact bodies 6 a and 6 b are attached to the distal end portion 52 of the base 5. The contact bodies 6a and 6b include pedestals 61a and 61b, arms 62a and 62b, and contacts 63a and 63b.

  As shown in FIGS. 2A and 2B, the pedestals 61 a and 61 b can be advanced and retracted substantially vertically with respect to the rotation center P <b> 2 of the base 5. It is attached to the side wall 521 of 52. Here, the directions in which the two pedestals 61a and 61b can move forward and backward (the direction of arrow J in FIG. 2A) are the same. That is, the direction from the rotation center P2 of the base 5 toward the contact body 6a coincides with the direction from the rotation center P2 of the base 5 toward the contact body 6b. As the pedestals 61a and 61b move forward and backward with respect to the rotation center P2 of the base 5, the entire contacts 6a and 6b move forward and backward with respect to the rotation center P2 of the base. As shown in FIG. 1A, the arms 62a and 62b extend from the pedestals 61a and 61b to the tubular body 10 side. The contact 63a is attached to the tip of the arm 62a so as to be in contact with the outer peripheral surface 11 of the tube body 10, and the contact 63b is provided in the arm 62b so as to be able to contact the inner peripheral surface 12 of the tube 10. It is attached to the tip. In each contact body 6a, 6b, the pedestals 61a, 61b, the arms 62a, 62b, and the contacts 63a, 63b move forward and backward integrally.

  As shown in FIGS. 1B, 2A and 2B, the pressing means 7 has one end connected to the contact body 6a pedestal 61a and the other end connected to the pedestal 61b of the contact body 6b. ing. The pressing means 7 can be expanded and contracted along the direction of moving back and forth with respect to the rotation center P <b> 2 of the base 5, so that the bases 61 a and 61 b can be moved back and forth with respect to the rotation center P <b> 2 of the base 5. Let The pressing means 7 is attached to the tip 52 by a support member (not shown). The pressing means 7 can be composed of a member that can expand and contract in one axial direction such as an air cylinder.

  The load adjusting means 8a (see FIG. 2 (c)) and the load adjusting means 8b (see FIG. 2 (d)) include a roller group composed of a plurality of rollers, first winding portions 83a and 83b, Winding portions 84a and 84b and counterweights 85a and 85b are provided.

  Since the load adjusting means 8a and 8b have the same configuration, only the configuration of the load adjusting means 8a will be described in detail here. As shown in FIG. 2C, the roller group is composed of two rollers 81a and 82a attached to the tip 52 of the base 5 along the direction in which the base 61a can move forward and backward. The first winding portion 83a is wound around one roller 81a located at one end of the roller group, one end is coupled to the pedestal 61a, and the other end is coupled to the counterweight 85a. The second winding portion 84a is wound around the other roller 82a located at the other end of the roller group, and one end is coupled to the pedestal 61a and the other end is coupled to the counterweight 85a. As the first winding part 83a and the second winding part 84a, for example, a belt-like one, a linear wire, or the like can be used. The counterweight 85a can be moved along a guide (not shown) formed at the distal end portion 52 of the base 5 that extends in a direction in which the counterweight 85a can move forward and backward with respect to the rotation center P2 of the base 5. Yes. The weight of the counterweight 85a is substantially the same as the weight of the contact body 61a. The first winding portion 83a, the counter weight 85a, the second winding portion 84a, the base 61a, and the roller group, the first winding portion 83a, the counterweight 85a, and the second winding portion. A loop composed of 84a and a pedestal 61a is formed.

  The load adjusting means 8a having such a configuration has a large component in the direction in which the pedestal 61a can move forward and backward among the gravity acting on each contact member 6a (hereinafter, referred to as “gravity component T ′ of the contact member 6a” as appropriate). The adjustment load V ′ applied to the contact body 6a having substantially the same direction and opposite direction is applied to the base 61a of the contact body 6a. Similarly, the load adjusting means 8b has a component and a magnitude in the direction in which the base 61b can move forward and backward among the gravity acting on each contact body 6b (hereinafter, referred to as “gravity component T ′ of the contact body 6b”). The adjustment load V ′ for the contact body 6b which is substantially the same and opposite in direction is applied to the base 61b of the contact body 6b.

  Next, the dimension measurement of the tubular body 10 by the tubular body dimension measuring apparatus 1 whose configuration has been described above will be described.

  First, as shown in FIG. 1, the elevating shaft 21 is rotated so that the axis P <b> 1 of the tubular body 10 and the rotation center P <b> 2 of the base 5 are aligned. Next, the pressing means 7 is extended, the pedestal 61a is retracted from the rotation center P2 of the base 5 (axial center P1 of the tubular body 10), and the pedestal 61b is moved to the rotational center P2 of the base 5 (axial center of the tubular body 10). The distance between the contact 63a and the contact 63b is made larger than the thickness of the tubular body 10 by proceeding toward P1).

  Next, the radius adjusting shaft 53 is rotated to move the contact 63 a to the outside of the outer peripheral surface 11 of the tube body 10 and to move the contact 63 b to the inside of the inner peripheral surface 12 of the tube body 10.

  Next, as shown in FIG. 1B, the rotary head 2 is moved along the axis P1, and the contact 63b is inserted into the inner space of the tubular body 10, so that the contact 63a and the contact 63b The tube body 10 is positioned therebetween.

  Next, the pressing means 7 is contracted to advance the pedestal 61a toward the rotation center P2 of the base 5 until the contact 63a contacts the outer peripheral surface 11, and the contact 63b contacts the inner peripheral surface 11. The pedestal 61b is retracted from the rotation center P2 of the base 5 until the above. When the contact 63a contacts the outer peripheral surface 11 and the contact 63a contacts the inner peripheral surface 12, the pressing means 7 is further contracted and a predetermined load is applied to the base 61a toward the rotation center P2 of the base 5. Then, a predetermined load is applied to the pedestal 61b in a direction retreating from the rotation center P2 of the base 5. As a result, the contact 63 a is pressed against the outer peripheral surface 11 of the tubular body 10, and the contact 63 b is pressed against the inner peripheral surface 12 of the tubular body 10. Note that the load applied by the pressing means 7 to the pedestals 61 a and 61 b is substantially constant regardless of the rotation angle of the base 5.

  Next, the base 5 is rotated around the rotation center P2. Accordingly, the contact 63a slides on the outer peripheral surface 11 in the circumferential direction, and the contact 63b slides on the inner peripheral surface 12 in the circumferential direction. When the contact 63 a slides on the outer peripheral surface 12, the position of the contact 63 a in the direction in which the pedestal 61 a can move forward and backward varies depending on the shape of the outer peripheral surface 11. Similarly, when the contact 63 b slides on the inner peripheral surface 12, the position of the contact 63 b in the direction in which the pedestal 61 b can move forward and backward varies depending on the shape of the inner peripheral surface 12.

  The pedestal 61a is applied with an adjustment load V 'applied to the contact body 6a having the opposite direction and substantially the same size as the gravity component T' of the contact body 6a by the load adjusting means 8a. For this reason, the gravity component T ′ of the contact body 6 a acting on the contact body 6 a and the adjustment load V ′ are substantially canceled. Accordingly, the force that affects the amount of bending of the arm 62a in the direction in which the pedestal 61a can move forward and backward is substantially the load that the pressing means 7 applies to the pedestal 61a. The load applied to the pedestal 61 a by the pressing means 7 is a direction in which the direction proceeds toward the rotation center P <b> 2 of the base 5, and the size is substantially constant. For this reason, the force that affects the amount of bending of the arm 62a in the direction in which the pedestal 61a can move forward and backward is constant. For this reason, the amount of bending of the arm 62a becomes substantially constant during sliding.

  Further, an adjustment load V 'for the contact body 6b having the opposite direction and the substantially same size as the gravity component T' of the contact body 6b is applied to the pedestal 61b by the load adjusting means 8b. For this reason, similarly to the bending amount of the arm 62a, the bending amount of the arm 62b becomes substantially constant during sliding.

  The dimension calculation means is a pedestal in a direction in which the pedestal 61a can move forward and backward when the contacts 63a and 63b slide on the outer peripheral surface 11 and the inner peripheral surface 12 (hereinafter referred to as “sliding” as appropriate). Based on the position of 61a (the distance d from the axis P1 to the pedestal 61a), the distribution of the distance from the axis P1 to the outer circumferential surface 11 in the circumferential direction of the tubular body 10 (hereinafter referred to as “circumferential distribution of the outer circumferential surface” as appropriate). ). As shown in FIG. 3A, the distance d is a predetermined position (hereinafter referred to as “reference position 522” as appropriate) of the tip 52 located on a straight line L1 connecting the base 61a and the axis P1 of the tube body 10. And the second distance d2 from the reference position 522 to the base 61a is calculated. The first distance d1 can be calculated based on the amount of rotation of the radius adjustment shaft 53, and the second distance d2 can be an optical non-contact distance meter attached to the tip 52, a Magnescale (registered trademark), or the like. Can be measured. The distance d may be calculated by a dimension calculating unit or a unit different from the dimension calculating unit.

  Based on the position of the pedestal 61b in the direction in which the pedestal 61b can be moved back and forth (the distance from the axis P1 to the pedestal 61b) during sliding, the dimension calculating means A distance distribution to the peripheral surface 12 (hereinafter referred to as “circumferential distribution of the inner peripheral surface” as appropriate) is obtained. The circumferential distribution of the inner circumferential surface is obtained in the same manner as the circumferential distribution of the outer circumferential surface.

  The dimension calculating means calculates the outer diameter of the tubular body 10 from the circumferential distribution of the outer peripheral surface, calculates the inner diameter of the tubular body 10 from the circumferential distribution of the inner peripheral surface, and outputs the calculated outer diameter and inner diameter to a monitor or the like. . Further, the dimension measuring means may calculate the thickness of the tubular body 10 based on the difference between the calculated outer diameter and the calculated inner diameter, and output the thickness. Further, the tube size calculation means is configured such that when the contacts 63a and 63b slide on the outer peripheral surface 11 and the inner peripheral surface 12, the contacts 63a and 63b slide at a predetermined angle with respect to the axis P1. Each time, the difference between the distance from the axis P1 to the pedestal 61a and the distance from the axis P1 to the pedestal 61b may be calculated, and the wall thickness of the tubular body 100 may be calculated based on the difference. According to such a method, the thickness can be calculated without obtaining the circumferential distribution of the outer circumferential surface and the circumferential distribution of the inner circumferential surface.

  As described above, since the bending amounts of the arms 62a and 62b are substantially constant, the dimension calculating means can calculate the outer diameter and the inner diameter with higher accuracy.

  The pressing means 7 includes a first pressing member that moves the base 61 a forward and backward with respect to the rotation center P <b> 2 of the base 5, and a second pressing member that moves the base 61 b forward and backward with respect to the rotation center P <b> 2 of the base 5. These two members may be used.

  In addition, the contact bodies 6a and 6b may be attached to the distal end portion 52 of the base 5 so that the directions in which they can advance and retract are different. That is, the contact bodies 6a and 6b are arranged at the distal end portion of the base 5 so that the direction from the rotation center P2 of the base 5 toward the contact body 6a is different from the direction from the rotation center P2 of the base 5 toward the contact body 6b. 52 may be attached. In such a configuration, the contact 63 a is placed on the outer peripheral surface 11 and the contact 61 b is placed on the inner peripheral surface 12 in a state where the position of the contact body 6 a and the position of the contact body 6 b in the circumferential direction of the tube body 10 are shifted. It will slide. Even in the case of sliding in such a shifted state, the wall thickness can be calculated based on the circumferential distribution of the outer circumferential surface and the circumferential distribution of the inner circumferential surface.

  A description will be given of the fact that the adjustment load V 'applied to the contact body 6a is opposite in direction to the gravity component T' of the contact body 6a and has substantially the same magnitude. The principle that the adjustment load V ′ for the contact body 6a and the contact body 6b is opposite in direction to the gravity component T ′ of the contact body 6a and the contact body 6b and substantially the same is the same. The description that the adjustment load V ′ applied to the body 6b is opposite in direction to the gravity component T ′ of the contact body 6b and substantially the same in magnitude is omitted.

  FIG. 3 is a schematic diagram for explaining that the adjustment load V ′ applied to the contact body 6a is opposite in direction to the gravity component T ′ of the contact body 6a and has substantially the same size. FIG. 3A is a schematic diagram showing the gravitational component T ′ of the contact body 6a when the pedestal 61a is positioned vertically below the axis P1 of the tubular body 10, and FIG. FIG. 4 is an enlarged view of a portion of the tubular body dimension measuring apparatus 1 in FIG. As shown in FIG. 3A, the acute angle formed by the horizontal direction of the direction in which the pedestal 61a can move forward and backward (the direction of the straight line L1 connecting the pedestal 61a and the axis P1 of the tubular body 10) is θ1, and the contact Assuming that the gravity acting on the child 6a is T, the gravity component T ′ of the contact body 6a has a direction retreating from the axis P1 of the tubular body 10 and has a magnitude of Tsin θ1.

  On the other hand, as shown in FIG. 3B, the two rollers 81a and 82a constituting the load adjusting means 8a are attached along the direction in which the pedestal 61a can move forward and backward, and the first winding portion 83a and The direction of the second wrapping portion 84a is a direction in which the pedestal 61a can move forward and backward regardless of the rotation angle of the base 5.

  Therefore, the other end of the first winding portion 83a and the second winding portion 84a coupled to the counterweight 85a has a component U in the direction in which the pedestal 61a can move forward and backward among the gravity U acting on the counterweight 85a. '(Hereinafter referred to as “gravity component U ′ of counterweight 85a”) acts as appropriate. The gravity component U ′ of the counterweight 85 a is a direction in which the direction retreats from the axis P <b> 1 of the tubular body 10, and the magnitude is Usin θ <b> 1.

  As shown in FIG. 2C, when the gravity component U ′ of the counterweight 85a acts on the other end of the first winding portion 83a and the second winding portion 84a, the first winding portion 83a and the second winding portion. An adjustment load V ′ applied to the contact body 6a having the opposite direction and the same size as the gravity component U ′ acts on one end of the portion 84a.

  Therefore, the direction of the adjustment load V ′ with respect to the contact body 6 a is a direction that proceeds toward the axis P <b> 1 of the tubular body 10, and the magnitude is Usin θ <b> 1.

  From the above, when the pedestal 61a is positioned vertically below the axis P1 of the tubular body 10, the adjustment load V ′ for the contact body 6a is large in the direction opposite to the gravity component T ′ of the contact body 6a. Are almost the same.

  FIG. 3C is a schematic diagram showing the gravity component T ′ of the contact body 6a when the pedestal 61a is positioned vertically above the axis P1 of the tubular body 10, and FIG. These are enlarged views of the portions of the load adjusting means 8a, 8b in FIG. As shown in FIGS. 3C and 3D, when the pedestal 61a is positioned vertically above the axis P1 of the tubular body 10, the gravity component T ′ and the counterweight of the contact body 6a. The magnitude of the gravity component U ′ of 85a is Tsin θ1 and Usin θ1. In addition, the direction of the gravity component T ′ and the gravity component U ′ is a direction that proceeds toward the axis P <b> 1 of the tubular body 10.

  Therefore, the gravity component T ′ of the contact body 6 a is a direction in which the direction proceeds toward the axis P <b> 1 of the tube body 10, and the magnitude is Tsin θ <b> 1.

  On the other hand, the gravity component U 'of the counterweight 85a is a direction in which the direction proceeds toward the axis P1 of the tubular body 10, and the magnitude is Usin θ1. For this reason, the direction of the adjustment load V ′ with respect to the contact body 6 a is a direction retreating from the axis P <b> 1 of the tubular body 10, and the magnitude is Usin θ <b> 1.

  As described above, since Tsin θ1 and Usin θ1 are substantially the same, even when the pedestal 61a is positioned above the axis P1 of the tubular body 10 in the vertical direction, the adjustment load V ′ with respect to the contact body 6a is maintained at the contact body 6a. The gravity component T ′ is opposite in direction and substantially the same size.

  Therefore, regardless of whether the pedestal 61a is positioned vertically below or above the axis P1 of the tube body 10, the adjustment load V ′ for the contact body 6a is large in the direction opposite to the gravity component T ′ of the contact body 6a. Are almost the same.

  In this embodiment, the directions in which the pedestals 61a and 61b can move forward and backward are the same (the directions are the same in the arrow J directions in FIGS. 2A, 2C, and 2D). For this reason, the pressing means 7 is contracted along the direction of advancing and retreating with respect to the rotation center P <b> 2 of the base 5, so that the pedestal 61 a is moved to the axial center of the tube body 10 until the contact 63 a contacts the outer peripheral surface 11. The base 61b can be retracted from the axial center P1 of the tubular body 10 until the contact 63b comes into contact with the inner peripheral surface 11 by moving toward the P1. Further, in a state where the contact 63a is in contact with the outer peripheral surface 11 and the contact 63b is in contact with the inner peripheral surface 12, the pressing means 7 is further contracted along the direction of moving forward and backward with respect to the rotation center P2 of the base 5. By doing so, a predetermined load can be applied to the pedestal 61a toward the axis P1 of the tubular body 10, and a predetermined load can be applied to the pedestal 61b in a direction retreating from the axial center P1 of the tubular body 10. Therefore, in the tubular body dimension measuring apparatus 1 of the present embodiment, the pressing means 7 can be configured by a single member that can expand and contract in a uniaxial direction. By configuring the pressing means 7 with one member, the number of parts of the tubular body dimension measuring apparatus 1 can be suppressed.

  Examples of the present invention and comparative examples will be described below.

  As shown in FIG. 4, the contact 63 a of the tubular body dimension measuring apparatus of the present embodiment was slid on the outer peripheral surface 21 of the tubular body 20, and the circumferential distribution of the outer peripheral surface of the tubular body 20 was obtained. In addition, the outer diameter of the tubular body 20 is 814 mm.

Comparative example

  The contact 203a of the second tubular body dimension measuring device described above was slid on the outer peripheral surface 21 of the tubular body 20, and the circumferential distribution of the outer peripheral surface of the tubular body 20 was obtained. In addition, the pipe body from which the circumferential direction distribution of the outer peripheral surface was calculated | required in the Example and the pipe body from which the circumferential direction distribution of the outer peripheral surface was calculated | required in the comparative example are the same pipe bodies.

  FIG. 5 shows a deviation between the circumferential distribution of the outer circumferential surface and the actual circumferential distribution of the outer circumferential surface obtained in Examples and Comparative Examples. The angle of the horizontal axis of the graph shown in FIG. 5 represents the position of the outer peripheral surface 21 in the circumferential direction, as shown in FIG.

  As shown in FIG. 5, the deviation between the circumferential distribution of the outer circumferential surface obtained in the example and the actual circumferential distribution of the outer circumferential surface was very small at any angle. On the other hand, the circumferential distribution of the outer circumferential surface obtained in the comparative example has a larger deviation from the actual circumferential distribution of the outer circumferential surface than the circumferential distribution of the outer circumferential surface obtained in the example, and the angle is 110 ° to 240 °. In the range of °, the distance from the axis P20 to the outer peripheral surface 20 is remarkably small. This is because, as the combined force of the load F and the gravity component W ′ that affects the bending of the arm 207a approaches the uppermost part of the outer peripheral surface 21 in the vertical direction (part corresponding to 180 °), This is considered to be because the arm 207a is greatly bent toward the axis 20 due to an increase in the direction of progress toward the rotation center P2 (axis 20) of the base 202. From the above, compared with the comparative example, the dimension of the tubular body could be measured with high accuracy in the example.

DESCRIPTION OF SYMBOLS 1 ... Tube dimension measuring apparatus, 3 ... Rotary head, 5 ... Base, 6a, 6b ... Contact body, 61a, 61b ... Base, 62a, 62b ... Arm, 63a, 63b ... Contact, 7 ... Pressing means, 8a, 8b ... Load adjusting means

Claims (4)

A tube provided with a rotary head arranged opposite to the axial direction with respect to a tubular body arranged so that its axial center is substantially parallel to the horizontal direction, and a dimension calculating means for calculating the dimension of the tubular body A body dimension measuring device,
The rotary head is
A base that rotates about a rotation center substantially parallel to the horizontal direction;
A contact body attached to the base so as to be movable back and forth with respect to the center of rotation of the base;
A pressing means for moving the contact body forward and backward to press the contact body against the peripheral surface of the tubular body;
Load adjusting means for applying a load in a direction in which the contact body can be advanced and retracted to the contact body;
The contact body is:
A pedestal attached to the base so as to be movable back and forth with respect to the rotation center of the base;
An arm extending from the pedestal toward the tubular body and moving forward and backward integrally with the pedestal;
A contact that is attached to the tip of the arm so as to be in contact with the peripheral surface of the tubular body, and moves forward and backward integrally with the arm;
The pressing means moves the pedestal forward and backward until the contactor contacts the peripheral surface of the tube body, and the contactor is in contact with the peripheral surface of the tube body, regardless of the rotation angle of the base. First, a substantially constant load is applied to the pedestal in the direction in which the pedestal can move forward and backward,
The load adjusting means applies a load that is opposite in direction to the component of the pedestal in the direction in which the pedestal can move forward and backward in the gravity acting on the contact body, and substantially the same size as the component, to the pedestal,
The dimension calculating means is configured to determine the tube body based on a position of the pedestal in a direction in which the pedestal can advance and retreat when the contactor slides on a peripheral surface of the tube body by rotation of the base. An apparatus for measuring a size of a tubular body, characterized by calculating a size of the tube. The load adjusting means is
A roller group consisting of a plurality of rollers attached to the base along the direction in which the base can be advanced and retracted;
A first wrapping portion wound around a roller located at one end of the roller group, one end coupled to the pedestal;
A second winding part wound around a roller located at the other end of the roller group, one end of which is coupled to the pedestal;
A counterweight coupled to the other ends of the first winding part and the second winding part and having a weight substantially equal to the weight of the contact body;
The tubular body according to claim 1, wherein the first winding portion, the counterweight, the second winding portion, the pedestal, and the roller group constitute a loop. Dimension measuring device. Two contact bodies are provided,
The pressing means advances the pedestal of one of the contact bodies toward the rotation center of the base until the contact of one of the contact bodies contacts the outer peripheral surface of the tubular body, With the contact of the body in contact with the outer peripheral surface of the tubular body, a substantially constant load is applied toward the center of rotation of the base regardless of the rotation angle of the base. And the base of the other contact body is retracted from the center of rotation of the base until the contact of the other contact body contacts the inner peripheral surface of the tubular body. In a state where the contactor is in contact with the inner peripheral surface of the tubular body, a substantially constant load is applied in the direction of retreating from the rotation center of the base regardless of the rotation angle of the base. Add to the pedestal,
The load adjusting means is a load whose direction is opposite to a component of the gravitational force acting on one of the contact bodies in a direction in which the pedestal of the one of the contact bodies can move forward and backward, and whose magnitude is substantially the same as the component. Is added to the pedestal of one of the contact bodies, the direction of the gravity acting on the other contact body is opposite to the component of the other contact body in the direction in which the pedestal can move back and forth, and the component A load having substantially the same size as that of the other contact body is applied to the pedestal,
The dimension calculating means includes
Due to the rotation of the base, the contact of one of the contact bodies slides on the outer peripheral surface of the tube body, and the contact of the other contact body slides on the inner peripheral surface of the tube body. The outer diameter of the tubular body is calculated based on the position of the pedestal in the direction in which the pedestal of one of the contact bodies can move forward and backward, and the pedestal of the other contact body can move forward and backward Calculating the inner diameter of the tube based on the position of the pedestal in the direction;
3. The calculated outer diameter and inner diameter of the tubular body are output, or the thickness of the tubular body calculated based on the calculated outer diameter and inner diameter of the tubular body is output. An apparatus for measuring a size of a tubular body according to 1. The two contacts are attached so that the directions in which they can move forward and backward match,
The said press means connects the said base of one said contact body, and the said base of the other said contact body, The dimension measuring apparatus of the tubular body of Claim 3 characterized by the above-mentioned.

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