JP3726461B2 - Shape measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a shape measuring device for measuring the shape of a panel or a monocoque structure and its temporal change, and more particularly to a shape measuring device having a sensor sleeve excellent in attachment to a measurement site and measurement accuracy.
[0002]
[Prior art]
As a method for attaching this type of shape measuring apparatus to a measurement site, a drainage flexible pipe is used as a sensor sleeve.
[0003]
That is, the shape measuring probe is slidably inserted into the flexible pipe, and one end of the shape measuring probe and the flexible pipe are bonded to the measurement target part or fixed with an adhesive tape or a bundled wire. .
[0004]
[Problems to be solved by the invention]
However, the method of attaching the shape measurement probe to the measurement site using a circular flexible pipe is advantageous in that it is easy to obtain the flexible pipe and is inexpensive, but the shape in the hollow portion of the flexible pipe is advantageous. Since the measurement probe is twisted or the shape measurement probe does not slide smoothly due to interference with the internal protrusions of the flexible pipe bellows structure, it is difficult to accurately capture the shape of the measurement site and the measurement accuracy is poor. there were.
[0005]
In addition, in a two-dimensional type shape measuring apparatus in which the detection axis of the shape measuring probe is one direction, there is no degree of freedom with respect to the perpendicular direction of the detection axis or torsional deformation of the angle detection unit. There was a risk that the connecting portion would be deformed or destroyed.
[0006]
In addition, since a commercially available flexible pipe has a circular cross-sectional shape, it has problems such as being unstable or difficult to fix when attached to a measurement site.
[0007]
The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a shape measuring apparatus having a sensor sleeve excellent in attachment to a measurement site and measurement accuracy.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the shape measuring device of the present invention is a shape measuring device in which a plurality of angle detecting units are rotatably connected, and the angle detecting unit detects an angle formed with an adjacent angle detecting unit. A plurality of angle detection units that are elastically extended along the extending direction of the hollow elastic pipe between the inner wall of the hollow elastic pipe and the angle detection unit. It is characterized by being held with a gap between the inner wall of the hollow elastic pipe via a deformable sliding member.
The shape measuring device of the present invention is a shape measuring device in which a plurality of angle detecting units are rotatably connected, and the angle detecting unit has an angle detecting means for detecting an angle formed with an adjacent angle detecting unit. The plurality of angle detection units can be elastically deformed by extending the hollow elastic pipe along the extending direction of the hollow elastic pipe between the inner wall of the hollow elastic pipe and the angle detection unit. It is characterized by being held so as to be in line contact via a sliding member.
Furthermore, the sliding member of the shape measuring apparatus of the present invention is characterized in that it is plate-like or wire-like that can be elastically deformed.
[0009]
In the shape measuring apparatus of the present invention , the angle detection unit has a rectangular cross section, the inner wall of the hollow elastic pipe has a cross section corresponding to the rectangular cross section of the angle detection unit, and the sliding member has each of the rectangular cross sections. At least one surface is provided on the surface.
[0010]
In the shape measuring apparatus of the present invention, the sliding member provided on the inner wall of the hollow elastic pipe parallel to the detection axis of the target surface of the shape measurement or the target surface where deformation is predicted by the angle detection means is plate-shaped. It is formed.
[0011]
The shape measuring apparatus of the present invention is characterized in that the plate-shaped sliding member is formed so that the contact surface with at least one of the hollow elastic pipe and the angle detection unit is linear. .
[0012]
The shape measuring apparatus of the present invention is characterized in that an angle formed by an adjacent angle detection unit is 90 ° orthogonal.
[0013]
[Action]
In order to perform shape measurement using the shape measurement apparatus of the present invention, first, a shape measurement probe is passed through the sensor sleeve, and the sensor sleeve is measured in a direction in which the detection axis of the shape measurement probe flexes and follows the shape change of the measurement target. Install along. Further, the first-stage angle detection unit of the shape measurement probe is fixed to the reference position of the measurement target surface together with the sensor sleeve.
[0014]
At this time, in the sensor sleeve according to the present invention, a sliding member made of an elastically deformable metal or resin in the form of a plate or wire is interposed on the inner wall surface of the sensor sleeve that is in contact with the shape measuring probe. The shape of the sensor sleeve that changes shape with the measurement target is transmitted to the shape measurement probe via the member, which prevents the shape measurement probe from being attracted, caught, and twisted, and smoothly and accurately follows the shape change of the measurement target. Can be made. As a result, the detection angle of each angle detection unit is actually along, and the shape measurement accuracy is improved.
[0015]
Further, in a two-dimensional type shape measuring apparatus in which the detection axis is in one direction, a plate-like sliding member on the inner wall parallel to the detection axis direction of the target surface of the angle detection unit or the target surface where deformation is predicted By interposing, the bending rigidity of the sensor sleeve in the direction perpendicular to the detection axis and in the twisting direction can be increased. Therefore, even when deformation in the direction perpendicular to the detection axis or the torsional direction of the angle detection unit with no freedom of movement of the shape measurement probe is applied, the stress can be borne by the bending rigidity of the sensor sleeve, and the shape is directly It is possible to protect the shape measuring probe from being easily deformed or broken without being applied to the measuring probe.
[0016]
【The invention's effect】
According to the shape measuring device of the present invention, the shape measuring device can follow the shape change of the measurement target smoothly and accurately with a relatively simple structure, and the shape measuring probe is prevented from being twisted in the sensor sleeve. Therefore, the shape measurement accuracy can be improved.
[0017]
Also, in a two-dimensional type shape measuring device in which the detection axis of the shape measuring probe is unidirectional, the shape measuring probe is not easily deformed or broken along with improved shape measuring accuracy by improving the bending rigidity of the sensor sleeve. Can be protected.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First embodiment In the present embodiment, a shape measuring probe having a biaxial detection angle and capable of three-dimensional measurement is inserted into a sensor sleeve, and Fig. 1 (a) shows the embodiment. FIG. 1B is a sectional view, and FIG. 2 is a perspective view showing a configuration of a single three-dimensional shape measurement probe.
[0019]
First, the configuration of a single three-dimensional shape measurement probe will be described. In the three-dimensional shape measurement probe 1 of this embodiment, a plurality of angle detection units 14 are connected by links 16 in accordance with the measurement length of a measurement target. An angle detection element 15 is connected to each of the rotation axes x and y of the unit. Then, the shape of the measurement target surface is calculated from the detection angle of the angle detection element 15.
[0020]
On the other hand, as shown in FIG. 1A, the sensor sleeve 10 according to the present embodiment is made of a material such as silicone, nylon, or rubber, and its axial length is the axis of the three-dimensional shape measuring probe 1 described above. It is comprised from the elastic pipe 11 suitably matched with the length of the direction, and the wire (sliding member) 12 which consists of material which can be elastically deformed, such as single wires, such as a Teflon and a piano wire, or a strand wire. The wire 12 is provided so as to be in contact with the four surfaces of the three-dimensional shape measurement probe 1 while maintaining a slight gap a between the inner wall of the elastic pipe 11 and the three-dimensional shape measurement probe 1.
[0021]
In addition, since the wire 12 needs to absorb the change in the length of the sensor sleeve at the time of deformation, it should not be bonded to the elastic pipe 11 and the shape measuring probe 1 except for the attachment side of the reference point fixing screw 42 shown in FIG. It is said.
[0022]
Further, as shown in FIG. 1, when the detection axis of the target surface of the main shape measurement or the target surface where large deformation is expected is, for example, the X detection axis x, the wire 12 of the present embodiment has the X detection axis x. Two are provided on each of the left and right side surfaces parallel to the axial direction, and one is provided on each of the other upper and lower surfaces. This is to prevent the three-dimensional shape measuring probe 1 from being twisted easily in the elastic pipe 11 and to prevent the three-dimensional shape measuring probe 1 from contacting the inner wall of the elastic pipe 11 and increasing the sliding resistance.
[0023]
Therefore, since the three-dimensional shape measurement probe 1 is configured to be in line contact by interposing the wire 12, the sliding resistance is greatly reduced, and the deformation of the measurement target surface is smoothly transmitted to the three-dimensional shape measurement probe 1. As a result, the shape measurement accuracy is improved.
[0024]
In addition, regarding the shape of the outer side of the elastic pipe 11, in the embodiment shown in FIG. 1, it is a flat surface so that it can be stably attached to the general measurement target surface 40 of FIG. 3. Needless to say, it is desirable to finish the shape in a shape from the viewpoint of improving the accuracy of shape measurement.
[0025]
Further, regarding the number of wires 12, when the amount of deformation of the measurement target surface 40 is small, the friction coefficient of the elastic pipe 11 is relatively small, and sliding is caused by a part of the three-dimensional shape measurement probe 1 coming into contact. Considering the case where the resistance does not increase, if there is at least one on each of the upper, lower, left, and right inner walls of the elastic pipe 11 (four in total for the shape measuring device), an effect of reducing sliding resistance can be obtained.
[0026]
Incidentally, FIG. 3 is a diagram showing a procedure for performing measurement using the shape measuring apparatus of the present embodiment. First, the shape measuring probe 1 is inserted into the sensor sleeve 10 so as to be slidable in the sliding direction b. One end of the shape measurement probe 1 and the sensor sleeve 10 are fixed to a measurement reference point with a fixing screw 42. In addition, the sensor sleeve 10 is fixed to the measurement target portion 40 using an adhesive 41.
[0027]
In this way, the deformation of the measurement target surface 40 is transmitted to the shape measurement probe 1 via the sensor sleeve 10, and shape measurement is executed. The change in length due to the bending radius when the measurement object is deformed is absorbed by the elastic deformation of the sensor sleeve 10, and the shape measurement probe 1, the wire 12, and the spring plate 22 slide in the sensor sleeve 10. Absorbs by sliding to b.
[0028]
Second Embodiment In this embodiment, a two-dimensional shape measurement probe having a uniaxial detection angle is inserted into a sensor sleeve, and FIG. 4A is an overall perspective view of the embodiment. 4 (b) is a cross-sectional view, and FIG. 5 is a perspective view showing the configuration of a single two-dimensional shape measurement probe.
[0029]
First, the structure of a single two-dimensional shape measurement probe will be described. The two-dimensional shape measurement probe 2 of this embodiment has a shape in which one axis is deleted from the three-dimensional shape measurement probe 1 described above. Other basic configurations and operations are the same as those of the three-dimensional shape measurement probe 1 described above.
[0030]
However, since the two-dimensional shape measurement probe 2 has a configuration in which only the detection axis x has a degree of freedom as shown in FIG. 5, when a bending force in a direction perpendicular to the detection axis x is applied, the plate of the angle detection unit 23 and the angle detection element 15 are excessively loaded, and there is a high possibility of causing deformation or destruction.
[0031]
Therefore, in this embodiment shown in FIG. 4, when a bending force other than around the detection axis x of the two-dimensional shape measurement probe 2 is applied, a part of the load is borne by the sensor sleeve 20, and the two-dimensional shape measurement probe 2. It also has a function to prevent the deformation and destruction.
[0032]
The sensor sleeve 20 into which the two-dimensional shape measuring probe 2 is inserted includes an elastic pipe 21 made of silicone, nylon, rubber, or the like, an elastically deformable wire 12 such as a single wire such as Teflon or piano wire or a stranded wire, and a Teflon plate. And a spring plate 22 having a low frictional resistance and capable of elastic deformation.
[0033]
The wire 12 maintains a slight gap a between the two-dimensional shape measurement probe 2 and the elastic pipe 21 on the upper and lower surfaces of the inner wall of the elastic pipe 21 in the detection axis x direction, and is above the two-dimensional shape measurement probe 2. It is provided in contact with the lower surface. The spring plate 22 is configured to be in surface contact with the two-dimensional shape measurement probe 2 on the left and right inner walls parallel to the direction of the detection axis x of the target surface of the shape measurement or the target surface where deformation is predicted .
[0034]
At this time, the wire 12 and the spring plate 22 do not adhere to the elastic pipe 21 and the shape measuring probe 2 except for the reference point fixing screw 42 attached side in order to absorb the change in the length of the sensor sleeve 20 at the time of deformation.
[0035]
Therefore, since the two-dimensional shape measurement probe 2 is in contact with the wire 12 and is in contact with the spring plate 22 having a small frictional resistance, the sliding resistance is greatly reduced, and the measurement target surface is deformed. The data can be smoothly transmitted to the two-dimensional shape measurement probe 2, and as a result, the shape measurement accuracy is improved.
[0036]
Furthermore, since the bending rigidity in the direction perpendicular to the detection axis x of the sensor sleeve 20 and the torsional rigidity in the length direction are enhanced by the width and torsional rigidity of the spring plate 22, in the two-dimensional shape measurement, The deformation other than the detection axis x that causes an error is prevented from being transmitted to the two-dimensional shape measurement probe 2, and a part of the bending load is borne by the sensor sleeve 20 so that the two-dimensional shape measurement probe 2 The effect of preventing the deformation and destruction of can be obtained.
[0037]
Third Embodiment FIG. 6 is a cross-sectional view showing a third embodiment of the shape measuring apparatus of the present invention. In this embodiment, protrusions 23 are provided on the upper and lower sides of the spring plate 22 in the width direction. Thus, the two-dimensional shape measurement probe 2 is brought into contact. By doing so, the sliding resistance of the two-dimensional shape measurement probe 2 is further reduced and the rigidity is improved.
[0038]
The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0039]
For example, as a means for reducing the sliding resistance between the shape measuring probe and the sensor sleeve, a lubricating material such as powder (for example, baby powder) or lubricating oil having a friction reducing effect may be applied to the contact surface of the shape measuring probe. In this way, sliding resistance can be further reduced, which is extremely advantageous for improving the shape measurement accuracy.
[Brief description of the drawings]
FIG. 1 is a perspective view and a cross-sectional view showing a first embodiment of a shape measuring apparatus of the present invention.
FIG. 2 is a perspective view showing a shape measuring probe (shape measuring device) according to the first embodiment.
FIG. 3 is a front view for explaining a measurement procedure using the shape measuring apparatus of the present invention.
4A and 4B are a perspective view and a cross-sectional view showing a second embodiment of the shape measuring apparatus of the present invention.
FIG. 5 is a perspective view showing a shape measuring probe (shape measuring device) according to a second embodiment.
FIG. 6 is a cross-sectional view showing a third embodiment of the shape measuring apparatus of the present invention.
[Explanation of symbols]
1, 2 ... Shape measuring probe 10, 20 ... Sensor sleeve 11, 21 ... Elastic pipe 12 ... Wire (sliding member)
22 ... Spring plate (sliding member)
23 ... Protrusions

Claims (6)

In the shape measuring device in which a plurality of angle detection units are rotatably connected,
The angle detection unit has an angle detection means for detecting an angle formed with an adjacent angle detection unit ,
The plurality of angle detection units can be elastically deformed by extending the hollow elastic pipe along the extending direction of the hollow elastic pipe between the inner wall of the hollow elastic pipe and the angle detection unit. A shape measuring device which is held through a sliding member while maintaining a gap with an inner wall of the hollow elastic pipe. In the shape measuring device in which a plurality of angle detection units are rotatably connected,
The angle detection unit has an angle detection means for detecting an angle formed with an adjacent angle detection unit ,
The plurality of angle detection units can be elastically deformed by extending the hollow elastic pipe along the extending direction of the hollow elastic pipe between the inner wall of the hollow elastic pipe and the angle detection unit. A shape measuring device which is held so as to be in line contact via a sliding member. The shape measuring apparatus according to claim 1, wherein the sliding member has a plate shape or a wire shape capable of elastic deformation . The sliding member provided on the inner wall of the hollow elastic pipe parallel to the detection axis of the target surface for shape measurement or the target surface for which deformation is predicted by the angle detection means is formed in a plate shape. The shape measuring apparatus according to claim 1 or 2. Sliding member formed on the plate shape, according to claim 4, wherein the at least one the contact surface of the hollow elastic pipe and the angle detection unit is formed to have a linear Shape measuring device. The angle detection unit has a rectangular cross section, the inner wall of the hollow elastic pipe has a cross section corresponding to the rectangular cross section of the angle detection unit, and the sliding member has at least one surface on each surface of the rectangular cross section. The shape measuring device according to claim 1, wherein two shape measuring devices are provided.

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