JPS6238307A - Dimension measuring instrument for square metallic sheet - Google Patents

Abstract

PURPOSE:To automatically measure the width, length and right angle of a square metallic sheet on-line at the cut line by constituting a photoelectric tube detector, strobo emitter, linear array detector and computing element, etc. CONSTITUTION:Linear array detector 4a-4f is set is advance automatically at the position corresponding to the given target width, length and right angle of a metallic sheet 1 for the square metallic sheet 1 transferred by the transfer table 2 of a cut line. When the metallic sheet 1 is transferred and the tip part 1a thereof reaches to the lower part of the photoelectric tube detector 3, the detecting part 3 detects the passage of the metallic sheet 1 and issues an emitting command simultaneously to six strobo emitters 5 at the detecting timing thereof. The six emitters 5 irradiate the end face of the metallic sheet 1 passing through with emitting simultaneously. The six linear array detectors 4 detect the end face position of the metallic sheet 1 simultaneously with synchronizing by the reflecting light from the end face of the metallic sheet 1. The dimension measurement of the metallic sheet 1 is then performed by operating the width, length and right angle of the metallic sheet 1 by the computing element from the detected end face position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dimension measuring device that can automatically measure the width, length, and squareness of a rectangular metal plate such as a tin sheet on-line.

[Prior art and its problems]

The width, length, and squareness of rectangular tinplate sheets obtained by cutting long tinplate coils are measured off-line by sampling a portion of the lot off-line. For this reason, there was a risk that some of the unmeasured tin sheets would have defective dimensions. It should be noted that it is impossible to measure the total number of tinplate sheets offline due to the number of personnel involved.

For this reason, it is desired to develop a dimension measuring device that can automatically measure the width, length, and squareness of rectangular metal plates such as tinplate sheets online on the cutting line to obtain the rectangular metal plates. However, no dimension measuring device with such characteristics has been proposed yet.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a dimension measuring device that can automatically measure the width, length, and squareness of a rectangular metal plate such as a tin sheet online on a cutting line for obtaining a rectangular metal plate. be.

[Summary of the invention]

A dimension measuring device for a rectangular metal plate according to the present invention includes a phototube detector provided either above or below the conveyance table for detecting passage of a rectangular metal plate conveyed by the conveyance table; at least one strobe light emitter provided above the transport table that emits light when the metal plate is detected by a phototube detector;
six IJ near array detectors provided above the transport table for detecting the position of the end face of the passing metal plate in synchronization with the light emission of the strobe light emitter; and the six linear array detectors. a computing unit for calculating the width, length, and squareness of the passing metal plate from the position of the end face of the passing metal plate detected by the detector; and the six linear array detectors. Of,
The first and second detectors are oriented in a direction perpendicular to the conveyance direction and spaced apart from each other in the conveyance direction so as to cross one end surface of both end surfaces in the conveyance direction of the passing metal plate. The third detector is arranged in parallel with a space apart, and the third detector is arranged on an extension line of the first or second detector so as to cross the other end face of the passing metal plate in the conveying direction. , the fourth and fifth detectors are arranged in a posture facing in the perpendicular direction, and the fourth and fifth detectors are arranged so as to cross one of both end surfaces of the passing metal plate in a direction perpendicular to the conveyance direction,
The sixth detector is arranged in parallel with an interval in the perpendicular direction in a posture facing the conveyance direction, and the sixth detector is arranged on an extension line of the fourth or fifth detector to detect the passing metal plate. It is characterized in that it is disposed in a posture facing the conveyance direction so as to cross the other end surface of both end surfaces in a direction perpendicular to the conveyance direction.

[Structure of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The device for measuring dimensions of rectangular metal plates according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the dimension measuring device of the present invention. In FIG. 1, 1 is a rectangular metal plate such as a tin sheet cut from a tin coil, and 2 is a conveyance table installed on a cutting line from which the metal plate 1 is obtained. The dimension measuring device of the present invention includes one phototube detector 3 provided above the transfer table 2, six linear array detectors 4 and six strobe light emitters 5, and a phototube detector 3 provided above the transfer table 2. and one arithmetic unit (not shown).

The phototube detector 3 is for detecting the passage of the rectangular metal plate 1 conveyed by the conveyance table 2, and detects the passage of the rectangular metal plate 1 conveyed by the conveyance table 2. 2 and close to the top. The phototube detector 3 is fixed to a positioning bar 6a that straddles the transport table 2 via a frame 7a. The phototube detector 3 detects the passage of the metal plate 1 by detecting the front end face 1a of both end faces in the direction perpendicular to the conveying direction of the metal plate 1, and detects the passage of the metal plate 1 at this detection timing.
A light emission command is issued to the strobe light emitters 5 all at once. In addition,
The phototube detector 3 may detect the passage of the metal plate 1 by capturing the rear end surface 1b of the metal plate 1, or may be provided below the conveyance table 2.

The six linear array detectors 4 are for detecting the end face position of the passing metal plate 1 in synchronization with the light emission of the six strobe light emitters 5, and the linear array detectors 4 are composed of a photodiode array or the like. ing. The six linear array detectors 4 are arranged above and close to the conveyance table 2 in the arrangement shown in FIG. 2 so that they can simultaneously detect the position of the end face of the passing metal plate 1.

That is, among the six linear play detector numbers, the first and second detectors 4a and 4b are arranged so that the end face IC on the left side in the transport direction of both end faces in the transport direction of the metal plate 1 passing therethrough is selected. They are arranged parallel to each other with gaps in the transport direction, with the element arrangement direction facing perpendicular to the transport direction.

A line connecting the centers of the first and second detectors 4a and 4b is perpendicular to the element arrangement direction of these detectors 4a and 4b. The third detector 4c is the first detector 4
The device is disposed in such a manner that the element arrangement direction is perpendicular to the conveyance direction so as to cross the left end surface 1d in the conveyance direction of the passing metal plate 1 on the extension line of a. These first and second detectors 4a and 4b and third detector 4C are slidably attached to a positioning bar 6a via a frame 7b and a cover C, respectively, and Conveyance direction both end faces IC and 1d
The position is automatically set in advance so that it can be detected at the center of the field of view. Note that the third detector 4c may be arranged on an extension line of the second detector 4b, or the first and second detectors 4a and 4b may be arranged so as to cross the left end surface 1d of the metal plate 1. The third detector 4c may be placed across the right end surface 1c of the metal plate 1.

Next, among the six linear play detectors 4, the fourth and fifth detectors 4d and 4e align their element arrangement direction with the conveyance direction so as to cross the tip surface 1a of the metal plate 1 passing through. The fourth and fifth detectors 4d and 4 are arranged parallel to each other with an interval in the direction perpendicular to the conveyance direction in the direction of the conveyance direction.
The midpoint position between 0 and 0 is located on the center line M of the pass line.

A line connecting the centers of the fourth and fifth detectors 4d and 4e is perpendicular to the element arrangement direction of these detectors 4d and 4e. The sixth detector 4f is the fourth detector 4d.
The element arrangement direction is oriented toward the conveyance direction so as to cross the rear end surface lb of the metal plate 1 passing through on the extension line. Fourth and fifth detectors 4d and 4e
The phototube detector 3 is mounted via the frame 7a and the mounting connected thereto is via the positioning bar 6.
It is fixed at a. The sixth detector 4f has a positioning bar 6
The metal plate 1 is slidably attached via a frame 7e to a positioning bar 6c extending in the conveyance direction between a pair of bars 6b, which are provided on the upstream side in the conveyance direction from A, and which straddle the conveyance table 2. The position is automatically set in advance so that the rear end surface 1b can be detected at the center of the field of view. Note that the sixth detector 4f may be arranged on an extension line of the fifth detector 4e, and the fourth and fifth detectors 4d and 4e may be arranged so as to cross the rear end surface 1b of the metal plate 1. The sixth detector 4f may be placed across the tip surface 1a of the metal plate 1.

The six strobe light emitters 5 are arranged one each close to the six linear array detectors.

The six strobe light emitters 5 emit light at the same time in response to a light emission command issued from the phototube detector 3, and the metal plate l passing through them emits light simultaneously.
is irradiated and the six detectors 4 are enabled to detect the position of the end face of the metal plate 1 by the reflected light. Note that if the strobe light emitter 5 is installed above the transport table 2 so that it can simultaneously irradiate all areas near the detected end face of the metal plate l passing through it, then =77L
/-(The end face of the passing metal plate l detected by the device 4 ゛ □ 15.. □.
[This is for calculating perpendicularity.]

Next, the pressure used to measure the dimensions of the metal plate 1 using this measuring device will be explained.

It is transported by the transport table 2 of the cutting line,
With respect to a rectangular metal plate 1 such as a tin sheet cut from a tin coil, linear array detectors 4a, 4b, 4c, and 4f are positioned at positions corresponding to a given target width, length, and squareness of the metal plate l. It is automatically set in advance.

A metal plate 1 is conveyed and its tip surface 1a is a phototube detector 3.
When reaching the lower part of
issue a command to emit light all at once. The six strobe light emitters 5 are
At the same time, light is emitted to illuminate the end face of the metal plate 1 passing through. 6
The linear array detectors 4 simultaneously detect the position of the end face of the metal plate 1 in synchronization with the reflected light from the end face of the metal plate 1. Then, a calculator calculates the width, length, and perpendicularity of the metal plate 10 from the detected end face position, and the dimensions of the metal plate 1 are measured.

- The width, length, and perpendicularity of the metal plate 1 shown in FIG. 2 are determined as follows.

(1) How to determine the width of the metal plate The width υ of the metal plate 1 is determined by the distance δ3 shown in FIG. By using δ2 and δ, it can be found from the geometrical relationship as follows.

Here, y: Width of metal plate 1, α: Distance between detectors 4a and 4b (known), j: Center-to-center distance between detectors 4a and 4b and detector 4C (known), δ, : Distance between the position of the edge IC detected by the detector 4a and the center of the detector 4a, δ, : Distance between the position of the edge IC detected by the detector 4b and the center of the detector 4b, δ,: Distance between the position of the end face 1d detected by the detector 4C and the center of the detector 46 (2) How to determine the length of the metal plate The length L of the metal plate 1 is determined by the detectors 4d and 4g. and 4f, the distance δ4. shown in the 4th line, which is determined from the end face position of the metal plate 1 detected by 4f. By using δ and dδ6,
It can be found from the geometric relationship as follows.

Here, ゛J-: Length of metal plate 1, C: Distance between detection m 4d and 4e (known), Lt:
Distance between centers of detectors 4d and 4e and detector 4f (known), δ4: position of end surface 1a detected by detector 4d
Distance between the position and the center of the detector 4d, ゛δ,: Detector 4
δ6: Distance between the position of end face 1a detected by detector 4f and the center of detector 4e; δ6: Distance between the position of end m1b detected by detector 4f and the center of detector 4f.

(3) How to find the perpendicularity of the metal plate FIG. 5 is an explanatory diagram showing how to find the perpendicularity of the metal plate l. In FIG. 5, the two axes are lines connecting the centers of detectors 4d and 4e, and the y-axis is a line connecting the centers of detectors 4a and 4b. L is a straight line that includes the end face IC of the metal plate 1 detected by the detectors 4a and 4b, and L2 is the straight line that includes the end face IC of the metal plate 1 detected by the detectors 4a and 4b.
and 40 is a straight line that includes the end surface 1a of the metal plate 1 detected at . α,′C1δ1. δ2. δ4 and δ are as explained in (1) and '(2) above. b is the distance from the origin 0 (0; 0) of the zy coordinate to the center of the detector 4a, and d is the distance from the origin 0 (0, 0) to the center of the detector 4e.

First, the end face 1a detected by the detectors 4a and 4b
Find the equation of straight line L1 from the position of .

L, :y=α1z+β, ・・・・・・・・・・・・
...■Here, α1. β is determined from the following simultaneous equations.

Next, the equation of the straight line L2 is determined from the position of the end face IC detected by the detectors 4d and 4e.

L2 near = α, 2 + β2 ・・・・・・・・・・・・
...■Here, α2. β2 is calculated using the following simultaneous equations.

Next, the coordinates ("p, lp) of the intersection P of the straight line L2 and L2 are determined.

Next, the straight line L1 passes through the intersection p (zp + ip)
Find the equation of the straight line L3 perpendicular to .

L3:l=α3χ1β3 ・・・・・・・・・・・・
■Here, find α3・α1=−1”q+7q).

” ”or 1=)to ・・・・・・・・・
....0th order, go straight through point Q (zq, 2q),
Find the equation of the line L4 perpendicular to .

L<:y=α, χ+β4 ・・・・・・・・・・・・・・・
...... ■Here, α4・α, knee 1 Next, the coordinates (χR, yR) of the intersection B of the straight lines L2 and L4 are determined.

Then, the distance t between the point Q ("Q17Q) and R (zR, PR) is determined.

・=Aπ-7stoneπfy...[Phase] This t is the straight line L1 including the end surface 1c of the metal plate 1 and the straight line L including the end surface 1a.
A point Q on a straight line L3 that passes through the intersection P with 2 and is perpendicular to the straight line L3, and a point Q that passes through the point Q and is orthogonal to the straight line L3, that is, the straight line
Since it is the distance between the point R of the end face lc on the straight line L4 parallel to , it is an index of the perpendicularity between the end faces 1a and 1c of the metal plate l, generally the perpendicularity of the metal plate 1. Therefore,
This t is determined as the perpendicularity of the metal plate 1 as described above.

Since the dimension measuring device of the present invention is configured as described above, it is possible to measure the width, length, and squareness of the rectangular metal plates after cutting on the cutting line for all the metal plates being transported. I can do it. Normally, a metal plate such as a tin sheet cut from a tin coil is unrestrained after being cut, so the posture placed on the conveyance table does not necessarily face straight in the conveyance direction, but may be slanted. In many cases, the degree of slanting varies depending on the metal plate. However, according to the dimension measuring device of the present invention, the width, length, and Can measure squareness. In addition, since a strobe light emitter is used as a light source for detection with the linear array detector, the light energy is accumulated in the detector only when the strobe is emitted momentarily, so it can be used even on high-speed conveyor lines. , it is possible to prevent movement errors of the metal plate, and it is possible to measure dimensions with high precision.

In addition, according to the dimension measuring device of the present invention, it is possible to measure the dimensions of all rectangular metal plates being transported on the cutting line, so by installing a reject device on the cutting line, metal plates with defective dimensions can be removed. can be automatically sorted, eliminating the need for off-line sorting of metal plates with defective dimensions.

〔Effect of the invention〕

According to the present invention, there is provided a dimension measuring device for a rectangular metal plate, which can automatically measure the width, length, and squareness of a rectangular metal plate such as a tin sheet online on a cutting line for obtaining the rectangular metal plate. Ru.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the dimension measuring device of the present invention, FIG. 2 is a layout diagram showing the arrangement of the linear array detector in the device shown in FIG. 1, and FIG. FIG. 4 is an explanatory diagram showing how to determine the width of a rectangular metal plate using the apparatus shown in FIG.
FIG. 5 is an explanatory diagram showing how to determine the squareness of a rectangular metal plate. In the drawings, 1... Rectangular metal plate, 1a to 1d... End face, 2... Transport table, 3... Phototube detector, 4.4a to 4f... Linear array detector, 5...
- Strobe light emitter.

Claims (1)

[Claims] A phototube detector provided above or below the transport table for detecting passage of a rectangular metal plate transported by the transport table; and a phototube detector for detecting the metal plate by the phototube detector. at least one strobe light emitter disposed above the transport table, which emits light, and a strobe light emitter for detecting the position of an end surface of the passing metal plate in synchronization with the light emission of the strobe light emitter. Six linear array detectors provided above the transport table, and the width of the passing metal plate from the position of the end face of the passing metal plate detected by the six linear array detectors, and a calculator for calculating length and perpendicularity, and of the six linear array detectors, the first and second detectors are arranged at both ends of the passing metal plate in the conveyance direction. The third detector is arranged parallel to the conveyance direction with an interval in the direction perpendicular to the conveyance direction so as to cross one end surface of the surfaces, and the third detector A fourth detector is disposed on an extension line of the detector and is oriented in the perpendicular direction so as to cross the other end surface of both end surfaces of the passing metal plate in the transport direction.
and a fifth detector is spaced apart in the perpendicular direction with an orientation toward the transport direction so as to cross one end face of the passing metal plate in a direction perpendicular to the transport direction. The sixth detector is arranged in parallel with the fourth or fifth detector, and the sixth detector crosses the other end face of the passing metal plate in the direction perpendicular to the conveyance direction. A dimension measuring device for a rectangular metal plate, characterized in that it is arranged in an attitude facing the conveyance direction.