JPH08159703A - Bending inspection instrument for long-sized pipe - Google Patents

Abstract

PURPOSE: To provide a bending inspection instrument for long-sized pipe with which the bending of the long-sized pipe can be inspected efficiently and accurately. CONSTITUTION: A work carrier surface 2 of a surface table 1 is inclined while a mobile base 4 is arranged parallel therewith free to move. The mobile base 4 is provided with a rotation applying mechanism 20 to applying a rotation to work W, a measuring element 31 free to slide in the direction orthogonal to the work carrier surface 2 and a detector 32 to detect a sliding value of the measuring element 31. When the rotation applying mechanism 20 is driven moving the mobile base 4 parallel with the work carrier surface 2, the work W is moved rolling on the work carrier surface 2. The bending value of the work W can be detected with the detector 32 as a sliding value of the measuring element 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long pipe bend inspection device. For example, it can be used for inspection of bending amount of nuclear fuel pipes.

[0002]

BACKGROUND ART Conventionally, the following two methods are known for bending inspection of long pipes having a long overall length and a small wall thickness such as nuclear fuel pipes. The first inspection method is to stretch a thread at a predetermined height from the surface of the surface plate in parallel with the surface of the surface plate, and pass a long pipe (hereinafter, referred to as a work) while rolling between them, and the work touches the thread at this time. This is a method in which an inspector visually judges whether or not the result is acceptable or not. The second inspection method is to place a flat plate at a predetermined height from the surface of the plate parallel to the surface of the plate, and while rolling the work between them, insert a gauge into the gap between the work and the flat plate to measure the thickness of the gauge. Is a method of determining the amount of bending of the work and making a pass / fail judgment.

[0003]

However, in the above-described conventional inspection method, when it is attempted to determine the bending amount over the entire length of the work and the entire circumference, the above-described method is performed every time the work rolls by a predetermined angle. Since it is necessary to make a pass / fail judgment, there is a drawback that it takes a lot of time and labor and is inefficient. Further, since the judgment is made by contact with the thread or insertion of a gauge, there are many places that rely on the skill and intuition of the inspector, and there is a drawback that individual differences easily occur and accuracy is lacking.

An object of the present invention is to provide a long pipe bend inspection device which can efficiently and accurately perform a bend inspection of a long pipe.

[0005]

A long pipe inspection apparatus according to the present invention is provided with a surface plate having a work mounting surface on its upper surface and a movable surface parallel to the work mounting surface of the surface plate. A movable base, and a work rolling means for moving the work while rolling on the work mounting surface in accordance with the movement of the movable base,
The movable table is provided with a measuring element slidably provided in a direction orthogonal to the work mounting surface and in contact with the work, and a detector for detecting a sliding amount of the measuring element. .

In the present invention, the work rolling means is
A configuration may be provided that includes a moving mechanism that moves the movable table parallel to the work mounting surface of the surface plate, and a rotation imparting mechanism that imparts rotation to the work as the movable table moves. Further, it is preferable that the work mounting surface of the surface plate is inclined in the moving direction of the movable table.

[0007]

[Operation] When inspecting a long pipe, the work (long pipe) is set on the work mounting surface of the surface plate, and then the movable table is moved in parallel with the work mounting surface. Is moved while rolling on the work placement surface. During this time, the probe is slid in the direction orthogonal to the work placement surface according to the bending amount of the work,
The amount of slide of the tracing stylus is detected by the detector.
Therefore, since the bending amount of the work can be automatically inspected only by moving the movable table in parallel with the work mounting surface, the inspection time can be significantly shortened as compared with the conventional first and second inspection methods, and Since the error based on the skill and intuition of the inspector can be eliminated, the bending inspection of the long pipe can be performed efficiently and
Can be done accurately.

Further, the work rolling means is provided with a moving means for moving the movable table parallel to the work mounting surface of the surface plate, and a rotation imparting means for imparting rotation to the work as the movable table moves. Then, as the movable table moves, the work does not slip on the work mounting surface and moves while reliably rolling on the work mounting surface, so the amount of bending in the entire circumference of the work can be accurately measured. Can be inspected.

Further, if the work mounting surface of the surface plate is inclined in the moving direction of the movable table, the work will move while rolling on the work mounting surface by the inclination of the work mounting surface. . This makes it possible to perform accurate bending inspection because it is not necessary to forcibly apply a rotational force to the work. That is, when the work mounting surface is horizontal, in order to move the work while rolling on the work mounting surface, it is necessary to forcibly apply a rotational force to the work. However, in order to apply the rotational force, for example, if the rotational force is forcibly applied only to both ends of the long work, the both ends to which the rotational force is applied are curved with respect to the central part, and the accurate This is because the bend inspection may not be performed in some cases.

Further, in the construction in which the work rolling means comprises the moving means and the rotation applying means, if the work mounting surface of the surface plate is inclined in the moving direction of the movable table, the rotation applying means. By imparting a weak rotational force to the work so that the work does not bend, it is possible to assist the rolling of the work at the start of the inspection or during the inspection, and from this point as well, accurate bending inspection can be performed.

[0011]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of the long pipe bending inspection apparatus of this embodiment, FIG. 2 is a side view thereof, and FIG. 3 is III of FIG.
It is a III-line sectional view. In these figures, 1 is a surface plate. A work mounting surface 2 is provided on the upper surface of the surface plate 1 in an inclined manner, and guide rails 3 on both sides are provided.
A movable table 4 is provided via A and 3B so as to be movable in parallel with the work mounting surface 2 and along the inclination direction thereof. The movable table 4 is composed of movable plates 5A and 5B which are slidable along the guide rails 3A and 3B, and a movable frame 6 which is bridged between the movable plates 5A and 5B.

A moving mechanism 10 is connected to the one guide plate 5A for moving the movable table 4 in parallel with the work mounting surface 2 and along the inclination direction thereof.
The moving mechanism 10 includes a feed screw shaft 1 which is rotatably supported on one side surface of the surface plate 1 in parallel with the guide rail 3A.
1 and a motor 12 for rotating the feed screw shaft 11
And a moving block 13 whose lower end is screwed onto the feed screw shaft 11 and whose upper part is connected to the one movable plate 5A.

The movable plates 5A, 5B are provided with a rotation imparting mechanism 20 for imparting rotation to both ends of the work W as the movable table 4 moves. The rotation imparting mechanism 20 rotates the rotating shaft 22 and the supporting plates 21A and 21B provided on the movable plates 5A and 5B, the rotating shaft 22 rotatably supported between the supporting plates 21A and 21B. The motor 23, the drive roller 24 fixed to both ends of the rotary shaft 22, the rotation assisting rollers 25A and 25B for assisting the rotation of the work W by receiving the rotation from the drive roller 24, and the rotation assisting roller 25A. , 25B
Receiving rollers 26A, 26 for receiving the work W on the side opposite to
It is composed of B and. The receiving rollers 26A, 2
6B is rotatably supported by support plates 27A and 27B fixed on the guide plates 5A and 5B.

The moving mechanism 10 and the rotation imparting mechanism 20 include a work rolling means 9 for moving the work W while rolling the work W on the work mounting surface 2 as the movable table 4 moves. I am configuring. Although not shown, the moving mechanism 10 is provided with a detector for detecting the amount of rotation of the motor 12 (that is, the amount of movement of the movable table 4), and the rotation imparting mechanism 20 is provided with the rotation of the motor 23. Detectors for detecting the amount (that is, the rotation amount of the work W) are provided respectively.

On the back side of the movable frame 6, a tracing stylus 31 is provided slidably in a direction orthogonal to the surface plate 1 via a guide mechanism 30, and the tracing stylus 31 slides. Detector 32 for detecting quantity
Is attached. The tracing stylus 31 is composed of a flat plate having a length parallel to the surface plate 1 and extending over substantially the entire length in the longitudinal direction of the work W, and the measurement pressure adjusting mechanism 40 can adjust the measurement pressure for the work W. It is like this.

The measurement pressure adjusting mechanism 40 has a plurality of pulleys 41 rotatably provided on the upper end surface of the movable frame 6 at predetermined intervals along the longitudinal direction of the work W, and is attached to each pulley 41. The wire 42 has one end connected to the probe 31, and the weight 43 fixed to the other end of each wire 42.

Next, the operation of this embodiment will be described. In the inspection, first, the movable table 4 is mounted on the work surface 2 of the surface plate 1.
After being moved to a position above, the work W is rotated by the rotation assisting rollers 25A, 25B and the receiving roller 2 of the rotation imparting mechanism 20.
Set between 6A and 26B. Here, the moving mechanism 1
The motors 12 and 23 of the 0 and rotation imparting mechanism 20 are driven. When the motor 12 is driven, the moving block 13 is moved, so that the movable table 4 is moved downward along the guide rails 3A and 3B. At the same time, since the motor 23 is driven, the work W is moved while rolling on the work mounting surface 2 of the surface plate 1.

During this period, the tracing stylus 31 is slid in the direction orthogonal to the work mounting surface 2 in accordance with the bending amount of the work W, so that the sliding amount is detected by the detector 32. Measuring element 31 detected by detector 32
The amount of sliding, the amount of movement of the movable table 4, and the amount of rotation of the work W are sent to an arithmetic unit (not shown), where the work W
The maximum amount of bending over the entire circumference of is calculated.

Therefore, according to the present embodiment, the movable table 4 is movably provided in parallel with the workpiece mounting surface 2 of the surface plate 1, and the rotation imparting mechanism 20 for imparting rotation to the workpiece W on the movable table 4.
Since the probe 31 slidable in the direction orthogonal to the workpiece mounting surface 2 and in contact with the workpiece W and the detector 32 for detecting the sliding amount of the probe 31 are respectively provided, When the rotation imparting mechanism 20 is driven while moving 4 in parallel with the work mounting surface 2, the work W is moved while rolling on the work mounting surface 2, and the maximum bending amount of the work W at that time is the probe 31. Since the amount of slide can be detected by the detector 32, the bending inspection of the long pipe can be performed efficiently and accurately.

That is, compared with the conventional first and second inspection methods, the inspection time can be greatly shortened, and since it is not judged by contact with the thread or insertion of a gauge, it depends on individual differences such as the skill and intuition of the inspector. Since the error factor can be eliminated, accurate measurement can be performed.

Moreover, since the work mounting surface 2 of the surface plate 1 is inclined, it is not necessary to apply a large rotational force to the work W by the rotation applying mechanism 20, and the rolling of the work W does not stop. A small turning force is enough. That is, in a long pipe having a long overall length and a thin wall, if a large rotational force is forcibly applied to both ends of the long pipe, the workpiece W is bent due to the rotational force, that is, in the central portion. On the other hand, both ends (ends to which rotational force is applied)
As a result of the bending, there is a drawback that an accurate bending inspection cannot be performed. In the case of the present embodiment, even if a large rotational force is not applied to the work W, the work W moves by rolling due to the inclination of the work placement surface 2, so that an accurate bend inspection can be performed.

Further, since the measuring pressure adjusting mechanism 40 for the tracing stylus 31 is provided, the measuring pressure for the work W can be adjusted to an arbitrary value. Moreover, the measurement pressure adjusting mechanism 40
Are a plurality of pulleys 41 rotatably provided on the upper end surface of the movable frame 6, wires 42 that are wound around the pulleys 41 and have one end connected to the probe 31, and the other ends of the wires 42. Since the weight 43 is fixed to the weight 43, the measurement pressure can be easily adjusted only by changing the weight of the weight 43.

Although the present invention has been described above with reference to the preferred embodiments, the present invention is not limited to these embodiments, and modifications can be made without departing from the gist of the present invention. In the above embodiment, the rotation assisting rollers 25A and 25B and the receiving rollers 26A and 26B are provided to sandwich the work W between the movable plates 5A and 5B, respectively.
25B is rotated by the motor 23,
As long as the work W can sufficiently roll by itself from the relationship between the inclination angle of the work placement surface 2 and the weight of the work W, the rotation assisting rollers 25A and 25B do not have to be rotated by the motor 23. Both ends have only the rotation assisting rollers 25A and 25B, or this and the receiving roller 2
6A and 26B may be rotatably held.

Further, in the above embodiment, the tracing stylus 31 is constituted by a flat plate having a length parallel to the work mounting surface 2 of the surface plate 1 and extending over substantially the entire length of the work W in the longitudinal direction.
It is not limited to this. For example, the measuring element is a cylindrical body, and is arranged parallel to the work mounting surface 2 of the surface plate 1 and at right angles to the axis of the work W, and the measuring element 31 and the detector 32 are arranged in the axial direction of the work W. If a drive device that can be positioned at any position is attached, it is possible to inspect the bending amount of the work W at any position.

Further, the detector is not limited to the structure for detecting the linear displacement of the spindle described in the above embodiment, but may be any other detector. For example, the amount of sliding of the tracing stylus may be detected by direct light.

[0026]

According to the long pipe inspection apparatus of the present invention,
The bending inspection of a long pipe can be performed efficiently and accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a long pipe bending inspection device according to the present invention.

FIG. 2 is a side view of the above embodiment.

FIG. 3 is a sectional view taken along line III-III of FIG.

[Explanation of symbols]

 1 surface plate 2 workpiece mounting surface 4 movable table 9 workpiece rolling mechanism 10 moving mechanism 20 rotation imparting mechanism 31 measuring element 32 detector W workpiece

Claims (3)

[Claims] 1. A surface plate having a work mounting surface on an upper surface thereof, a movable table provided movably in parallel with the surface of the surface mounting surface of the surface plate, and the workpiece as the movable table moves. Work rolling means for moving while rolling on the work mounting surface, a measuring element slidably provided on the movable table in a direction orthogonal to the work mounting surface and abutting on the work, and the measuring element A long pipe bend inspection device having a detector for detecting a slide amount 2. The long pipe bending inspection apparatus according to claim 1, wherein the work rolling means moves the movable table parallel to a work mounting surface of the surface plate.
A long pipe bending inspection apparatus, comprising: a rotation imparting mechanism that imparts rotation to the work as the movable table moves. 3. The long pipe bending inspection apparatus according to claim 1 or 2, wherein a work mounting surface of the surface plate is inclined in a moving direction of the movable table. Shake pipe bend inspection device.