JPH06213640A - Curvature measurement method for rectangular body and its device - Google Patents

Abstract

PURPOSE:To measure a curvature quickly and efficiently in the middle step of product manufacture and to measure a curvature highly precisely even though a moving rectangular body inclines. CONSTITUTION:In a curvature measurement device which measure a curvature of a rectangular body 1 moving at a constant speed, a distance from the fixed point provided on a measurement line 5 crossing at right angles with the moving direction of the rectangular body 1 to the side face of the rectangular body 1 passing a measurement line 5 and a passing length of the rectangular body 1 on the measurement line 5 are measured respectively, an inclination of the rectangular body 1 in the moving direction deltaL=(L2-L1)/S is calculated, and a curvature of each points of the side face of the rectangular body 1 deltaIx= Lx-L1-xdeltaL is calculated. L1, L2, and Lx represent measurement distances from the fixed point to the side face point, side face end of the rectangular body 1, and from the point to the side face x, while S represents the passing length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring the degree of bending of a rectangular body such as a panel or a pillar of a building material, and more particularly, to a case where a moving rectangular body is tilted and moved by a conveying means. Also relates to a method and an apparatus for measuring the degree of bending with high accuracy.

[0002]

2. Description of the Related Art A rectangular body such as a cement-based extruded panel is extruded from an extrusion molding machine, conveyed and conveyed by a conveying means such as a roller conveyor, cut into a predetermined length, and then cured and cured. However, due to a malfunction of the extruder or the conveying means, the rectangular body may bend, for example, meandering left and right. Since such bending is one of the causes of product defects, the degree of bending is measured, and if it is a certain value or more, it is treated as a defective product.

A conventional method for measuring the bending degree is to apply a straight line ruler 2 to the side surface parallel to the length direction of a rectangular body 1 which is a finished product as shown in FIG. x The bending degree δx at each point was measured, and it was determined whether or not the maximum value exceeded the allowable value.

[0004]

However, in the above method, a defective product can be found only in the final product stage,
Since the measurement is performed manually, there are problems that it takes a lot of man-hours, that the measurement takes a long time, and that the measurement accuracy is low and there are variations. In view of the above problems, it is an object of the present invention to provide a method for measuring the degree of bending of a rectangular body online and quickly and highly accurately during the movement of the rectangular body in a manufacturing process or the like, and an apparatus therefor. It is a thing.

[0005]

According to the bending degree measuring method of the present invention for solving the above-mentioned problems, first, a measuring line from a fixed point provided on a measuring line orthogonal to the moving direction of a rectangular body moving at a constant speed is measured. The distance to the side surface of the rectangular body passing through and the passing length of the rectangular body on the measurement line are measured. Next, the difference between the measured distances L ₁ and L ₂ from the fixed point to the side end and side end of the rectangular body and the inclination δL = (L ₂ −L ₁ ) / of the moving direction of the rectangular body from the passage length S. S is calculated, and further, a measurement distance L _x from the fixed point to each side surface point of the rectangular body and a bending degree δI _x = L _x −L ₁ −x δL of each side surface point of the rectangular body are calculated from δL. It is what

Further, the bending degree measuring device of the present invention for solving the above-mentioned problem is a rectangular body which passes through the measurement line from a fixed point provided on a measurement line orthogonal to the moving direction of the rectangular body which moves at a constant speed. A side distance measuring means for measuring a distance to a side surface, a passage length measuring means for measuring a passage length of a rectangular body on a measurement line, and respective measurement distances L ₁ from the fixed point to a side surface tip and a side surface end of the rectangular body. , L ₂ and the passage length S, the inclination δL = (L
₂₋ L ₁ ) / S is calculated, and the measured distance L _x from the fixed point to each side surface point of the rectangular body and the degree of curvature δI _x = L _x −L ₁ −x δL from δL to each side surface of the rectangular body. And a calculating means for calculating

[0007]

According to the bending degree measuring method of the present invention, since a moving rectangular body can be quickly measured online, defective products can be removed at an initial stage. Further, the difference between the measured distances L ₁ and L ₂ from the fixed point to the side end and side end of the rectangular body and the inclination δL = (L ₂ −L ₁ ) / S in the moving direction of the rectangular body from the passage length S The calculated distance L _x from the fixed point to each point on the side surface of the rectangular body is calculated.
And the degree of curvature δI _x = L at each point on the side surface of the rectangular body from the above δL
_{Since x−} L ₁ −xδL is calculated, even if the rectangular body is conveyed in a posture inclined with respect to the moving direction, the inclination is automatically corrected to accurately measure the bending degree. be able to.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a plan view schematically showing an example in which the bending degree measuring device of the present invention is applied to a cement-based extrusion panel as a rectangular body, and FIG. 2 is a front view thereof. The rectangular body 1 is placed on a pallet 3 and moved at a constant speed in the arrow direction by a roller conveyor type conveying means 4.

A non-contact type side distance measuring means 6 is installed on a measuring line 5 orthogonal to the moving direction of the rectangular body 1, and the side distance measuring means 6 is, for example, a laser length measuring method using a principle of triangulation. Can be used. As shown in FIG. 3, the side surface distance measuring means 6 defines an intersection of the measurement line 5 and a fixed line 7 orthogonal thereto as a fixed point P, and the distance from the fixed point P to the side surface 1a of the rectangular body 1 passing through the measurement line 4. Is measured in a non-contact manner. A pair of reflective optical sensors 8 and 9 are provided on both sides of the side surface distance measuring means 6 in order to detect passage of the tip and the end of the moving rectangular body 1. For example, these optical sensors output signals that are turned off when the rectangular body 1 is absent and turned on when the rectangular body 1 is present.

FIG. 4 is a view for explaining the principle of the method of the present invention, and shows a case where the carrier 1 is tilted at an angle of inclination θ with respect to the moving direction of the arrow. The position of the fixed point P, which is the intersection of the measurement line 5 and the fixed line 7, is the measurement reference point in the side surface distance measuring means 6. Then, the distance from the fixed point P to the side surface 1a of the rectangular body moving at a constant speed is successively measured at a constant time interval. Side 1 of the rectangular body at that time
The measurement position of a is expanded on the moving axis as a projection plane, and P _{1 to} P
It is indicated by _n .

That is, in this example, the side surface 1a of the rectangular body is n
It is measured in equal parts. Since the rectangular body 1 moves at a constant speed, assuming that the measurement time interval (sampling interval) is t, the length on the moving axis of the rectangular body passing on the measuring line 5 of the rectangular body, that is, on the measuring line 5 of the rectangular body. Passage length S is t
It can be calculated by × n. Therefore, in this example, the passage length of the rectangular body on the measurement line is constituted by the calculation means for multiplying the set value of the time t by the number of times of measurement n. However, as the passage length measuring means on the measurement line of the rectangular body, other than this, for example, the optical sensor 8 or a sensor similar thereto is provided to detect the leading end and the end of the passing rectangular body, and to detect the detection. A method of providing a counter or the like for measuring the time difference may be used.

As described above, the distance from the fixed point P to the side surface 1a of the moving rectangular body is measured one after another at fixed time intervals, and the respective measurement distances L ₁ and L to the side surface tip and the side surface end at that time are measured. The inclination δL = (L ₂ −L ₁ ) / S of the moving direction of the rectangular body is calculated from the difference of ₂ and the passage length S.
Further, the measured distance L _x from the fixed point P to each point on the side surface 1a of the rectangular body and the bending degree δ from δL to each point on the side surface of the rectangular body.
Calculating the _{I x = L x -L 1 -xδL} . When this value exceeds the allowable value, the rectangular body 1 is rejected as a defective product.

FIG. 5 is a block diagram of the apparatus of the present invention,
In this example, the microcomputer system 10 is used as the calculation means. The outputs of the side surface distance measuring means 6 and the optical sensors 8 and 9 are input to the processing device 11. Further, a storage device 12 and a keyboard 13 are connected to the processing device 11, and the output thereof is a marking means 14 and an alarm means 1.
Connected to 5.

The storage device 12 stores the set value of the measurement time interval inputted from the keyboard 13, the arithmetic expression, etc., and the marking means 14 is formed into a rectangular body when the bending degree of the rectangular body exceeds an allowable value. Marking is performed by spraying or the like, and the alarm means 15 issues an alarm by a buzzer or the like at that time. At the same time, the rectangular body 1 is excluded from the conveying means to the outside of the system by an excluding means (not shown).

Next, the operation of the apparatus shown in FIG. 5 will be described with reference to FIGS. 6 and 7. First, when a start command is issued, the measurement preparation is started. When the arrival of the tip of the rectangular body on the measurement line is confirmed by the ON signals of both the optical sensors 8 and 9 (S ₁ ) in that state, the side surface distance measuring means 6 is set at the set sampling interval, for example, 1 second. The measurement of the side distance between the fixed point P and the rectangular body is started (S ₂ ).

In parallel with the sampling, in order to specify the tip position of the rectangular body, the tip reference sampling is started (S ₃ ). This latter sampling is, for example, the former 1
Perform 10 times at intervals of / 10 (0.1 seconds). Next, sample data sorting is performed in which the sampled values are rearranged in order from the maximum value to the minimum value (S ₄ ), and 2 out of the maximum are sorted out.
Points, 2 points from the minimum are cut and the remaining 6 points are averaged, and the average is set as the tip reference value (S ₅ ). The reason why the tip position of the rectangular body is specified in this way is to accurately specify the position even when dust or unevenness is present in the rectangular body.

On the other hand, the sampling (S ₂ ) ends when it is confirmed by turning off the output that the end of the rectangular body 1 has passed the detection point of the optical sensor 9 (S ₆ ). At this time, since the rectangular body does not pass the measurement line by the distance between the side surface distance measuring means 6 (measurement line) and the optical sensor 9, the rectangular body is used to identify the end position of the rectangular body, and the sampling is used for the tip reference sampling. Sampling for end reference is performed by the same method as in (S ₇ ). Next, sample data sort is performed in which the sampled values are sorted in order from the maximum value to the minimum value (S ₈ ), and 2 points from the maximum and 2 points from the minimum are cut out and averaged with the remaining 6 points. Is the end reference value (S ₉ ).

By the above steps, each data of lateral distance measurement sampling for bending degree measurement, tip reference sampling and end reference sampling is obtained.
Next, data processing is performed using them (S ₁₀ ). The contents of this data processing are shown in FIG. 7 as substeps.
In FIG. 7, first, a measurement distance L ₁ (tip reference value) from the fixed point P to the side surface tip of the rectangular body, a measurement distance L ₂ (end reference value) from the fixed point P to the side surface end of the rectangular body, and side surface distance measurement sampling. The gradient δL = (L ₂ −L ₁ ) / S in the moving direction of the rectangular body is calculated from the number n of (S ₁₀₁ ), and the calculated gradient δI _x = L _x of the side x of the rectangular body is used. −
L ₁ −xδL is calculated (S ₁₀₂ ).

Next, it is judged whether or not the degree of bending of the thus calculated δI _x exceeds the allowable set value (S
₁₀₃ ) If the value exceeds the set value, the count is increased in the storage device ( _S104 ). Next, it is determined whether or not the number of calculations has reached the number of side surface distance measurement samplings (S ₁₀₅ ), and if not reached, the process returns to step (S ₁₀₁ ), and if reached, the process proceeds to the next step in FIG. 6. .

In FIG. 6, after the step (S ₁₀ ) is completed, the calculation contents of the step (S ₁₀ ) are printed out if desired, and the count number in the step (S ₁₀₄ ) is set to a preset value. It is determined whether or not it exceeds (S ₁₁ ). If it exceeds the set value, the process proceeds to step (S ₁₂ ), a signal is output to the alarm means 15 and the marking means 14 is driven. The reason for making such a determination is to avoid erroneous determination due to noise.

If the set value is not exceeded in the above step (S ₁₁ ), or after the step (S ₁₂ ) is completed, it is judged whether or not a measurement stop command is issued (S ₁₃
), If it is out, the process ends (END), and if it is not out, the process returns to step (S ₁ ).

[0022]

According to the method and apparatus for measuring the degree of bending of a rectangular body of the present invention having the above-described structure, a defective product due to bending can be found quickly and efficiently in the middle of product manufacturing. Further, even when the moving rectangular body is moved by being conveyed by the conveying means, the degree of bending can be measured with high accuracy.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing an example in which the bending degree measuring device of the present invention is applied to a cement-based extrusion panel as a rectangular body.

FIG. 2 is a front view of FIG.

FIG. 3 is an enlarged view of a side surface distance measuring unit 6 portion of FIG.

FIG. 4 is a diagram showing a measurement principle of the present invention.

FIG. 5 is a block diagram of the measuring apparatus of the present invention.

6 is a flow chart for explaining the operation of the apparatus of FIG.

7 is a flowchart showing some sub-steps of the flowchart of FIG.

FIG. 8 is a diagram showing a conventional bending measurement method.

[Explanation of symbols]

 1 rectangular body 2 straight line ruler 3 pallet 4 conveying means 5 measuring line 6 lateral distance measuring means 7 constant line 8 optical sensor 9 optical sensor 10 computer system 11 processor 12 memory device 13 keyboard 14 marking means 15 alarm means

Claims (2)

[Claims] 1. A method for measuring the bending degree of a rectangular body moving at a constant speed, the distance from a fixed point provided on a measurement line orthogonal to the moving direction of the rectangular body to a side surface of the rectangular body passing through the measurement line, And the passage length of the rectangular body on the measurement line is respectively measured, and the difference between the measurement distances L ₁ and L ₂ from the fixed point to the side surface tip and side end of the rectangular body and the moving direction of the rectangular body from the passage length S. Slope of δL = (L
₂₋ L ₁ ) / S is calculated, and the measured distance L _x from the fixed point to each point on the side surface of the rectangular body and the degree of curvature δI _x = L _x −L ₁ −xδL from δL to each point on the side surface of the rectangular body. A method for measuring the degree of bending of a rectangular body, which comprises: 2. A device for measuring the bending degree of a rectangular body that moves at a constant speed, wherein the distance from a fixed point provided on a measurement line orthogonal to the moving direction of the rectangular body to the side surface of the rectangular body that passes through the measurement line is measured. Side distance measuring means, a passage length measuring means for measuring a passage length of a rectangular body on the measurement line, and a difference between respective measurement distances L ₁ and L ₂ from the fixed point to the side surface tip and side surface end of the rectangular body. The inclination δL = (L ₂ −L ₁ ) / S of the moving direction of the rectangular body is calculated from the passing length S, and the measurement distance L from the fixed point to each side surface point of the rectangular body is calculated.
_{From x} and δL, the degree of bending of each point on the side surface of the rectangular body δI _x =
Rectangles of curvature measuring device and an arithmetic means for calculating L _x -L ₁ -xδL.