JP6493048B2 - Distance measuring device and distance measuring method - Google Patents

Description

  The present invention relates to a distance measuring device and a distance measuring method suitable for use in measuring, for example, a distance between a pair of scissors rolls.

As a distance measuring device for measuring a distance between opposing objects, for example, there are devices disclosed in Patent Document 1 and Patent Document 2.
Patent Document 1 discloses an inter-roll distance measuring device that measures a distance between rolls in a strip processing line having two or more rolls, and is inserted so as to be able to move smoothly into the hollow rod and the hollow rod. It is disclosed that it is composed of a telescopic rod which is composed of a rod and is provided with measurement seats at both ends thereof.
Patent Document 2 discloses an internal dimension measurement jig used to measure an internal dimension of a frame body such as an aluminum sash, and is inserted between two parts facing each other. A telescopic structure that can be stretched in a direction in which both end portions approach and separate from each other along a linear axis, and provided at one end of the telescopic structure, and perpendicular to the direction in which the telescopic structure approaches and separates A first abutting body having a first abutting surface and a second abutting body provided at the other end of the elastic structure and having a second abutting surface perpendicular to the approaching and separating directions of the elastic structure The structure containing these is disclosed.

Japanese Utility Model Publication No. 63-31306 JP 2005-326356 A

The distance measuring device described above measures the distance by an operator lifting it up, placing it between objects, and expanding and contracting it.
In this case, if the distance measuring device is inclined with respect to the object, an error occurs in the measurement distance. As a countermeasure, Patent Document 1 secures a squareness with respect to an object by providing a measurement seat and Patent Document 2 provides a level.

  In addition, the handling of the distance measuring device varies depending on the operator, and depending on how the distance measuring device is pressed against the object, the distance measuring device may be distorted or the end part may be deformed due to the load. There is. Even in this case, an error occurs in the measurement distance, and the distance between the objects cannot be measured accurately. However, Patent Document 1 and Patent Document 2 do not take into account distortion generated in the distance measuring device and acting load.

  The present invention has been made in view of the above points, and an object of the present invention is to enable accurate measurement of the distance between opposing objects.

The gist of the present invention for solving the above problems is as follows.
[1] A distance measuring device having a telescopic structure for measuring a distance between opposing objects,
At least one of a strain detection device that detects strain generated in the distance measurement device and a load detection device that detects a load acting on the distance measurement device;
Storage means for storing distance correction value information in which a distance correction value is associated with at least one of distortion generated in the distance measurement device and a load acting on the distance measurement device;
The distance stored in the storage means based on at least one of the strain detected by the strain detection device and the load detected by the load detection device when measuring the distance between the opposing objects A distance measuring apparatus comprising: a correction unit that acquires a distance correction value from the correction value information and corrects the measured distance.
[2] The distance measuring device according to [1], wherein the opposing objects are a pair of scissors rolls that width-roll a steel material.
[3] A distance measuring method for measuring a distance between opposing objects using the distance measuring device according to [1] or [2],
At least one of the strain detected by the strain detection device and the load detected by the load detection device at the time of measuring the distance using the distance measuring device for a prototype having a known distance On the other hand, creating distance correction value information associating the difference between the measured distance and the known distance as a distance correction value and storing it in the storage means;
Based on at least one of the strain detected by the strain detection device and the load detected by the load detection device when measuring the distance between the facing objects using the distance measurement device, A distance measurement method comprising: obtaining a distance correction value from distance correction value information stored in the storage means, and correcting the measured distance.

  According to the present invention, since the measured distance is corrected based on the strain generated in the distance measuring device and the load acting on the distance measuring device, the distance between the opposing objects can be accurately measured. .

It is a figure showing a schematic structure of a distance measuring device concerning an embodiment. It is a figure which shows the example of the picked-up image by a camera. It is a figure which shows the function structure of a processing unit. It is a flowchart which shows the preparation procedure of a table. It is a figure which shows the example of a table. It is a figure which shows the three-dimensional graph of the correction | amendment curved surface showing a load, distortion, and distance correction value. It is a flowchart which shows the correction process using a table. It is a schematic diagram which shows a mode that the distance between a pair of reed rolls is measured using the distance measuring device which concerns on embodiment.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a schematic configuration of a distance measuring device 1 according to the embodiment. As shown in FIG. 8, the distance measuring device 1 according to the present embodiment is used to measure the distance between a pair of scissors rolls 100 and 100 that width-roll a steel material. If the parallelism and distance accuracy between the pair of scissors rolls 100, 100 are poor, quality defects will be caused. Therefore, the distance between the pair of scissors rolls 100, 100 is measured and maintained so as to maintain the parallelism and distance accuracy. Has been done. In addition, the code | symbol 200 in FIG.

As shown in FIG. 1, the distance measuring device 1 includes an outer rod 2 and an inner rod 3 that can be freely inserted into and removed from the outer rod 2 and has a telescopic telescopic structure. The outer rod 2 and the inner rod 3 are made of, for example, an aluminum alloy in order to reduce the weight so that they can be lifted manually.
A coil spring 4 that urges the outer rod 2 and the inner rod 3 in the extending direction is built in the outer rod 2.
Further, at both ends of the distance measuring device 1, curved seat portions 5 that can be brought into contact with the heel roll 100 are disposed. When the distance measuring device 1 is used to measure the distance between the pair of scissors rolls 100, 100, the perpendicularity with respect to the scissors roll 100 can be ensured by bringing the seat 5 into contact with the scissors roll 100.

When the distance measuring device 1 is used to measure the distance between the pair of scissors rolls 100, 100, the operator lifts the distance measuring device 1 and places it between the pair of scissors rolls 100, 100, and the outer rod 2 and the inner rod The rod 3 is expanded and contracted to bring the seat 5 into contact with the heel roll 100.
Here, as shown in a partially enlarged view in FIG. 1, a linear scale 6 that is inclined in the longitudinal direction of the inner rod 3 is provided on the outer peripheral surface of the inner rod 3. Further, a camera 7 that reads the scale 6 by imaging a predetermined area 16 of the inner rod 3 is fixed at a proper position of the outer rod 2.
As shown in FIG. 2, the degree of expansion / contraction of the outer rod 2 and the inner rod 3 can be grasped by reading the scale 6 with the camera 7. 2A shows a captured image of the predetermined area 16 by the camera 7 at the time of maximum extraction, FIG. 2B shows an image of the predetermined area 16 by the camera 7 at the time of intermediate extraction, and FIG. The captured image of the predetermined area | region 16 with the camera 7 is shown. For example, the center position of the predetermined region 16 (see the arrows in FIGS. 2A to 2C) is set as the measurement position, and the height h of the memory 6 at the measurement position is read. The height h of the memory 6 at the measurement position is uniquely related to the degree of expansion / contraction of the outer rod 2 and the inner rod 3, that is, the measurement distance, by calibration in advance. Thereby, based on the height h of the scale 6 read with the camera 7, the measurement distance between a pair of reed rolls 100 and 100 can be calculated | required.

  The distance measuring device 1 is provided with an acceleration sensor 8 as a tilt detecting device that detects the tilt of the device 1. The result detected by the acceleration sensor 8 is displayed on, for example, a small monitor (not shown) provided in the distance measuring device 1 and notified to the worker, so that the worker can place the distance measuring device 1 horizontally when measuring the distance. can do. Although the example in which the acceleration sensor 8 is provided has been described here, a level may be provided.

  Further, the distance measuring device 1 is provided with a strain gauge 9 as a strain detecting device that detects strain generated in the device 1. For example, the strain gauge 9 is provided on the inner surface of the opening end of the outer rod 2, and the strain generated when the inner rod 3 contacts the inner surface of the opening end of the outer rod 2 is detected.

  The distance measuring device 1 is provided with a load cell 10 as a load detecting device that detects a load acting in the expansion / contraction direction. For example, a load cell 10 is provided in a spring receiver of the coil spring 4 to detect a load acting on the spring receiver.

The distance measuring device 1 includes a processing unit 11. The processing unit 11 is configured by a computer device including, for example, a CPU and a memory.
FIG. 3 shows a functional configuration of the processing unit 11.
A storage unit 12 stores a table in which distance correction values are associated with strains generated in the distance measuring device 1 and loads acting on the distance measuring device 1. Details of this table will be described later.
Reference numeral 13 denotes a distance measuring unit that obtains a measurement distance between the pair of scissors rolls 100 and 100 based on the scale 6 imaged by the camera 7 as described above.
A correction unit 14 is stored in the storage unit 12 based on the strain detected by the strain gauge 9 and the load detected by the load cell 10 when measuring the distance between the pair of scissors rolls 100, 100. A distance correction value is acquired from the table, and the measurement distance obtained by the distance measurement unit 13 is corrected. Details of correction using this table will be described later.
An output unit 15 outputs the distance corrected by the correcting unit 14. Examples of the output include, for example, displaying on a small monitor (not shown) provided in the distance measuring device 1 and transmitting the data to the outside via wireless communication.

Next, a table in which the distance correction value is associated with the strain generated in the distance measuring device 1 and the load acting on the distance measuring device 1 will be described.
FIG. 4 is a flowchart showing a table creation procedure.
First, in step S401, the distance l is measured by using the distance measuring device 1 for an original device having a known distance L (for example, 1500 [mm]). That is, as described above, the measurement distance of the original device is obtained based on the scale 6 imaged by the camera 7. At that time, in step S402, the strain is detected by the strain gauge 9, and the load is detected by the load cell 10.
Next, in step S403, a difference between the measurement distance l and the known distance L is obtained, and the difference is set as a distance correction value.
In step S404, as shown in FIG. 5, the load and strain detected in step S402 and the distance correction value obtained in step S403 are associated with each other and stored in a table.

By repeating the above work, a plurality of combinations of load, strain, and distance correction value are stored in the table as shown in FIG.
The table created in this way is stored in the storage unit 12. In the present embodiment, the example in which the distance correction value information referred to in the present invention is a table has been described. However, the present invention is not limited thereto, and may be stored in the storage unit 12 in the form of, for example, a mathematical expression or a graph. FIG. 6 shows a three-dimensional graph of the correction curved surface that represents the load, strain, and distance correction value. The data that is the basis of the correction curved surface is obtained by actual measurement as in the case of the above-described table, and values between the actual measurement values are obtained by interpolation such as linear interpolation.

Next, the correction | amendment using the table at the time of measuring the distance between a pair of reed rolls 100 and 100 using the distance measuring apparatus 1 is demonstrated.
FIG. 7 is a flowchart showing a correction process using a table.
First, in step S701, the distance measurement unit 13 obtains a measurement distance between the pair of scissors rolls 100 and 100 based on the scale 6 imaged by the camera 7 as described above. At that time, in step S702, the strain is detected by the strain gauge 9, and the load is detected by the load cell 10.
Next, in step S703, the correction unit 14 acquires a distance correction value from the table stored in the storage unit 12 based on the load and strain detected in step S702, and corrects the measurement distance obtained in step S701.

  For example, assume that the load detected in step S702 is 3.0 [kg / f] and the strain is 0.09 [mm]. In this case, as shown in FIG. 5, 0.3 [mm] is acquired as a distance correction value from the table. This distance correction value 0.3 [mm] is set to the corrected distance obtained by adding the measurement distance obtained in step S701.

Further, it is assumed that the load detected in step S702 is 3.05 [kg / f] and the strain is 0.1 [mm]. In this case, as shown in FIG. 5, since there is no matching value in the table, the distance correction value is calculated by linear interpolation.
For example, first, a distance correction value focusing on the load (referred to as a load cell distance correction value) is obtained by the following equation.
Load cell distance correction value = (Load detection interval correction value upper limit-Load detection interval correction value lower limit)
× (Load detection interval upper limit-Load detection interval lower limit) ÷ (Load detection value-Load detection value lower limit)
Specifically, since the load 3.05 [kg / f] is a value in the section 3.0-3.1 in the table, the load cell distance correction value is
(0.5-0.3). (3.1-3.0) / (3.05-3.0) = 0.4
Asking.

Next, the distance correction value is obtained by paying attention to distortion by the following equation.
Distance correction value = Load cell distance correction value-Strain distance correction value
Strain distance correction value = Strain detection value ÷ Linear weight × Target load cell correction section
Linear weight = (Distortion detection value−Distortion detection section lower limit) ÷ (Distortion detection section upper limit−Distortion detection section lower limit)
Target load cell correction section = Load cell distance correction value−Load detection section correction value lower limit Specifically, since the strain 0.1 [mm] is a value of 0.09−0.16 section in the table, the distance correction value The
0.4-0.1 / [(0.1-0.09) / (0.16-0.09)]. (0.4-0.3) = 0.31
Asking. The distance correction value 0.31 [mm] is added to the measurement distance obtained in step S701 to obtain a corrected distance.

  As described above, the measurement distance is corrected based on the strain generated in the distance measurement device 1 and the load acting on the distance measurement device 1. Thereby, even when the method of pressing the distance measuring device 1 on the heel roll 100 differs depending on the operator, the distance between the pair of heel rolls 100, 100 can be measured with high accuracy.

Although the present invention has been described together with the embodiments, the above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is interpreted in a limited manner by these. It must not be. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.
For example, in the above-described embodiment, an example in which both the strain gauge 9 and the load cell 10 are provided has been described. However, only one of the strain gauges 9 and the load cell 10 may be provided. However, if both the strain gauge 9 and the load cell 10 are provided, both strain and load can be considered, and the distance between the opposing objects can be measured with higher accuracy. For example, in the above embodiment, if a load is applied, a corresponding distortion is generated, so the table is arranged as shown in FIG. 5, but a matrix in which distance correction values are associated with one of the vertical and horizontal as a load and the other as a distortion. It may be a table. In addition, it is possible to obtain a more accurate distance correction value by performing secondary interpolation using both distortion and load instead of linear interpolation as in the above embodiment.

  Moreover, although the said embodiment demonstrated the structural example which incorporates the processing unit 11 in the distance measuring device 1, it is not limited to it. For example, the distance measuring device 1 and an external computer device are configured to be capable of wireless communication, and the strain detected by the strain gauge 9 and the load detected by the load cell 10 are transmitted to the external computer device, and the external computer device is transmitted. You may make it bear the function of the processing unit 11 mentioned above.

  1: distance measuring device, 2: outer rod, 3: inner rod, 4: coil spring, 5: seat, 6: scale, 7: camera, 8: acceleration sensor, 9: strain gauge, 10: load cell, 11: Processing unit, 12: storage unit, 13: distance measurement unit, 14: correction unit, 15: output unit, 16: camera

Claims (3)

A distance measuring device having a telescopic structure for measuring a distance between opposing objects,
At least one of a strain detection device that detects strain generated in the distance measurement device and a load detection device that detects a load acting on the distance measurement device;
Storage means for storing distance correction value information in which a distance correction value is associated with at least one of distortion generated in the distance measurement device and a load acting on the distance measurement device;
The distance stored in the storage means based on at least one of the strain detected by the strain detection device and the load detected by the load detection device when measuring the distance between the opposing objects A distance measuring apparatus comprising: a correction unit that acquires a distance correction value from the correction value information and corrects the measured distance.   The distance measuring device according to claim 1, wherein the opposing objects are a pair of scissors rolls for width rolling the steel material. A distance measuring method for measuring a distance between opposing objects using the distance measuring device according to claim 1 or 2,
At least one of the strain detected by the strain detection device and the load detected by the load detection device at the time of measuring the distance using the distance measuring device for a prototype having a known distance On the other hand, creating distance correction value information associating the difference between the measured distance and the known distance as a distance correction value and storing it in the storage means;
Based on at least one of the strain detected by the strain detection device and the load detected by the load detection device when measuring the distance between the facing objects using the distance measurement device, A distance measurement method comprising: obtaining a distance correction value from distance correction value information stored in the storage means, and correcting the measured distance.

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