JPS58113806A - Method for measuring length of material - Google Patents

Abstract

PURPOSE:To measure the length of a moving body bared on the pulses for the amount of the movement when the body moves along the known distance, by providing three end part detectors on a conveying path. CONSTITUTION:When the first detector +1 provided on the conveying path detects the rear end of the moving body, two counters begin counting and compute the pulses from a conveying device. The first counter counts the counted number alpha until the second detector D2 detects the rear end of the moving body. The second counter counts the counted number beta until the third detector D3 detects the front end of the moving body. From the counted values of the two counters, the length L of the moving body is obtained by an operating expression L=y-x(beta-alpha)/alpha, based on a distance x between the first and second detectors and a distance y between the second and third detector.

Description

[Detailed description of the invention] The present invention relates to an improved method for measuring material length.

Focusing on the length measurement method when the fixed material to be covered is a thick slab, the conventional technology will be clarified below. Its length is measured and checked against the indicated slab length. The method for measuring the slab length at this time necessarily involves measuring the length of the slab, so for example, two detectors are placed at a predetermined interval, and the first detector detects the rear end of the member. until the second detector detects its tip,
The pulses from the conveying device were integrated by a counter, and the slab length L was determined by L = coarse distance y) - number of counts x moving distance per count.

In addition, as a simpler method, the detector detects the member and
The pulses from the conveying device are accumulated by a counter from the time the switch turns on until the switch turns off, and the slab length is obtained by multiplying this count by the distance the member moves per one count.

There is no problem with any of these methods if the distance the thick slab moves per count is kept constant, but if the conveyance conditions change due to slippage, changes in roll diameter, etc. The distance traveled by the portrait also changed, making it difficult to obtain stable measurement accuracy.

The present invention was devised in view of this situation, and is a thickness measurement system that enables stable measurement accuracy by checking the moving distance of the slab material per one count of the counter on the needle side during richness measurement. A method for measuring plate slab length is provided. Embodiments of the present invention will be described in detail with reference to the drawings as follows.

Fig. 1 is an explanatory diagram of an apparatus for carrying out the method according to the present invention, and Fig. 2 is an explanatory diagram showing the relative relationship between a thick plate slab and a position detector in the apparatus of Fig. 1.

The detectors D1 to D6 are arranged at predetermined intervals x along the conveyance line,
y, and detects the leading edge or trailing edge of the thick plate slab 1. These detectors may be of a non-contact type using an optical or magnetic method, or of a contact type such as a limit switch. The drive motor conveys the thick plate slab 1 by rotating the table roller 3, and the table roller 23
Together with this, they constitute a transport device. and drive motor 2
A pulse generator is connected to the pulse generator 4, and the pulse generator 4 outputs the number of pulses proportional to the number of rotations of the drive motor to a counter 5.
．． Since the table roller 6 is connected to the drive motor 2, this number of pulses indicates the amount of movement of the thick plate slab. Pulse counter 5, 6
Although not shown, receives instructions from the detectors D1 to D6 and integrates the pulses from the pulse generator 4. The counts of the pulse counters 5 and 6 are each sent to the arithmetic unit 7, and predetermined arithmetic operations to be described later are performed to determine the length L of the thick plate slab.

Next, the length of the thick plate is detected by detector D2. The distance between D3 (y
) The method according to the present invention will be explained with attention to FIG. 2, dividing it into shorter and longer cases.

(1) The thick plate slab length L is the detector D2. If it is shorter than the distance (y) between D3; the counters 5 and 6 start integrating the pulses from the pulse generator 4 from the time when the detector D1 detects the rear end of the thick plate slab 1 from FIG. 2(a). . The counter 5 then integrates the pulses until the detector D2 detects the rear end of the thick plate slab 1. On the other hand, the counter 6 adds up until the detector D3 detects the tip of the thick plate slab 1. If the count number of the counter 5 at this time is αl and the count number of the counter 6 is βl, the thick plate slab length Ll is Ly (β1-αl) (2)
It is determined by α1.

(II) The length L of the thick plate slab is determined by the detector D2. If it is longer than the distance (y) between D3; counters 5 and 6 integrate the pulses from the pulse generator 4 from the time when the detector D1 detects the rear end of the thick plate slab 1 (Fig. 2 (d)). Begin to. Then, the counter 5 is detected by the detector D.
2 detects the rear end of thick plate slab 1 (Fig. 2 (d)
) starts integrating the pulses from the pulse generator 4. Then, the counter 5 integrates the pulses until the hoisting device D2 detects the rear end of the thick plate slab 1 (second [2+(f)). On the other hand, a six-counter detector D6 performs integration at a groove that detects the tip of the thick plate slab 1. If the count number of the counter 5 at this time is α2 and the count number of the counter 6 is β2, the thick plate slab length L! is obtained by and is the same as equation (1).

As is clear from the above explanation, in the method according to the present invention, in the above equations (1) and (2), one αl of the equation (1)
% Since it shows the amount of movement of slab 1, it means that the above amount of movement is measured every time measurement is taken, and the change in the amount of movement mentioned above, which was a problem in the conventional technology, has been corrected.
Stable and highly accurate measurements have been a success. In addition, even when the length of a thick plate slab is longer than the distance (y), the exact same formula can be applied as when it is short. It has the advantage that it can also be applied.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus for carrying out the method according to the present invention, and FIG. 2 is an explanatory diagram showing the relative relationship between the thick plate slab and the position detector in the apparatus of FIG. 1... Thick plate slab, 2... Drive motor, 6
...Table roller, 4...Pulse generator, 5
, 6... Counter, 7... Arithmetic device. Agent Patent Attorney Masatoshi Sato

Claims (1)

[Claims] An apparatus for conveying a material to be measured, in which a size 1 detector, a second detector, and a size 6 detector are arranged at predetermined intervals (J.y) along a conveyance line. (+) When the length of the material to be measured is shorter than the distance (y) between the second detector and the detector of the fang 6. . The first counter and the second counter are suppressed by the first detector! The pulses start to be integrated from the time when the rear end of the measuring material is detected, and the pulses are integrated until the counter Fi second detector of fang 1 detects the rear end of the material to be measured. Integration is continued until the detector No. 3 detects the tip of the material to be measured, and the count number of the first counter at this time is
If the count number of the counter of fang 2 is β1, then the length Ll of the material to be measured is obtained by L+ = y (β1-αl)αl, (1) Also, if the length of the material to be measured is the second detector and If it is longer than the distance (y) between the detector and the detector 6. As in the short case described above, the counter of fang 1 and the second counter start integrating the pulses from the time when the first detector detects the rear end of the material to be measured d), and the counter of fang 1 The second counter integrates until the second detector detects the rear end of the material to be measured, and the second counter integrates until the third detector detects the tip of the material to be measured. The count number of the counter is α2, and the count number of the second counter is β
2, the length L2 of the material to be measured is L2= y
(β2−α2) α2 A method for measuring material length, characterized in that it is determined by α2.