JPH04155208A - How to determine the quality of plate-shaped workpieces - Google Patents

Abstract

PURPOSE:To correctly and efficiently measure thickness and width sizes of a plate material by placing distance measuring displacement sensors on upper and lower parts or both sides of the plate material which is being carried laterally. CONSTITUTION:A clay-like plate material 1 is sent horizontally by a conveyer 2. Voltage according to a distance to an upper face of the plate material 1 is obtained by a sensor 3A, voltage according to a distance to a lower face is obtained by a sensor 3B, and distances X1, X2 are calculated by a control arithmetic unit 5, which are subtracted from a distance L between the sensors 3A, 3B to obtain thickness (t). Thus the thickness (t) can be detected even if the plate material 1 is distorted and has waving. If a reflecting surface is distant, the displacement sensors 3A, 3B output low voltage, while the arithmetic unit 5 maintains minimum voltage of a sensor output (a) when a synchronous signal is at low voltage according to a synchronous signal of appropriate frequency. The distance X1 to the uppermost face calculated from the voltage (b) is used to calculate the thickness (t) to automatically calculate the thickness even if a pattern is marked, and the thickness is compared with a predetermined value by a discriminating unit 6 for discrimination.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for determining the quality of plate-shaped workpieces, such as building materials, produced by extrusion molding.

BACKGROUND OF THE INVENTION In recent years, clay-like materials have been extruded to produce building materials, and in the post-extrusion process, irregularities are formed on the surface of the building materials to create patterns. Workpieces for construction materials have undulations and warps, as well as variations in thickness. Conventionally, workpieces have been visually inspected for undulations and warpages, or manually measured using calipers, etc. Determining defective products.

Problems to be Solved by the Invention However, since the above-mentioned conventional method relies on manual labor, there are problems in that it is inefficient and may cause misunderstandings. Further, since the workpiece has undulations and warps and has a pattern on its surface, there is also the problem that it is difficult to measure dimensions such as thickness.

The present invention solves the above-mentioned problems and problems, and aims to provide a method for determining the quality of a plate-shaped workpiece, which can efficiently and reliably determine the quality of a plate-shaped workpiece.

Means for Solving the Problems In order to solve the above-mentioned problems, a first means of the present invention is to arrange displacement sensors for distance measurement so as to face each other above and below a plate-like workpiece being transported laterally. The distance to the workpiece surface is measured using these displacement sensors.
The thickness of the workpiece is calculated by subtracting the distance to each workpiece surface from the distance between both displacement sensors, and this thickness value is compared with a predetermined thickness value to determine whether the workpiece is good or bad.

Further, a second means of the present invention is to calculate the maximum thickness or minimum thickness of the workpiece from the data from both displacement sensors in the first means, and compare this value with a predetermined thickness value to determine the quality of the workpiece. It is for discrimination.

Further, the third means of the present invention is to dispose displacement sensors for distance measurement facing each other on both sides of a plate-shaped workpiece that is being transported laterally, and to measure the distance to the side surface of the workpiece using these displacement sensors. Calculate the width of the workpiece by subtracting the distance from the distance between both displacement sensors to the side of each workpiece. Subtract this value from the default value. If the difference is slightly larger, it is determined that the workpiece is curved in the width direction or has a large defect. It is for discrimination.

Further, a fourth means of the present invention is to arrange a sensor for detecting the presence or absence of a plate-shaped work in the vicinity of the plate-shaped work being transported in the lateral direction, and detect the front and rear ends of the plate-shaped work by using this sensor. The length of the plate-shaped workpiece is calculated by a calculation device as the conveyance distance between the detected values, and this value is subtracted from the predetermined value. be.

Effect: By means of the first means, even if the workpiece has undulations or warps, the thickness of the workpiece can be accurately determined to be 1, and the quality determination based on the thickness of the workpiece can be performed accurately and efficiently.

Further, by the second means, even if a pattern is formed on the surface, it is possible to accurately and efficiently judge whether the work is good or bad based on the thickness at the top or bottom of the pattern and the thickness of the work under certain conditions.

Furthermore, by the third means, the degree of curvature of the work in the width direction can be accurately determined, and the quality determination based on the degree of curvature in the width direction of the work can be performed accurately and efficiently.

Moreover, by the fourth means, the degree of curvature of the workpiece in the longitudinal direction can be accurately determined, and quality determination based on the degree of curvature of the workpiece in the longitudinal direction can be performed accurately and efficiently.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, 1 is a plate-shaped work produced by extrusion molding a clay-like material, and is conveyed in a horizontal direction by a conveying device 2 comprising a roller conveyor or the like.

A plurality of rows of displacement sensors 3A and 3B for thickness measurement are disposed above and below the workpiece conveyance position, facing each other at predetermined intervals in the workpiece radius direction and workpiece longitudinal direction. Also,
Displacement sensors 4A and 4B for measuring the width of the workpiece are disposed facing each other on both sides of the workpiece conveyance position. The displacement sensors 4A and 4B for measuring the width of the workpiece are also used for detecting the longitudinal dimension of the workpiece. Each displacement sensor 3A, 3B,
4A and 4B are connected to a determining section 6 via a control calculation section 5. Note that no conveyance rollers or support members are provided between the displacement sensors 3A, 3B, 4A, and 4B so that measurements can be made without any trouble.

In the above configuration, when the workpiece 1 is transported by the transport device 2, the upper displacement sensor 3A outputs a voltage corresponding to the distance XI to the upper surface of the workpiece 1, and the lower displacement sensor 3B outputs a voltage corresponding to the distance XI to the upper surface of the workpiece 1. A voltage corresponding to the distance X2 is output.

Then, the distance X1 and the distance X2 are calculated by the control calculation unit 5, and these values are calculated by the displacement sensor 3A.

The thickness t is calculated by subtracting from the distance between 3B.

That is, the control calculation unit 5 calculates the thickness t by calculating the following formula (%), and calculates the thickness t of the workpiece l by measuring the distance between the upper and lower displacement sensors 3A, 3B and the workpiece 1. Therefore, even if the workpiece 1 has undulations or warps, the thickness t of the workpiece 1 can be detected without being affected by these.

Here, since the upper surface of the work 1 is patterned, for example, the uppermost surface of the work 1 is detected and the thickness t is calculated. In other words, the displacement sensor 3A.

3B uses a laser to output high voltage when the reflective surface is close, and outputs low voltage when the reflective surface is far away, or
As shown in the figure, the lowest voltage of the sensor output a at the low voltage of the synchronization signal is held in the control calculation unit 5 according to the synchronization signal of an appropriate frequency, and these eight voltages are calculated. The thickness t is calculated by the control calculation section 5 using the distance XI to the top surface.

In this way, a pattern is attached to the work l,
Even if there are undulations or warps, the thickness t of the work l is automatically measured, and the value of this thickness t is compared with a preset default value in the discrimination section 6, and if the difference is large, it is judged as a defective product. and processed in subsequent steps.

Simultaneously with the above thickness measurement, the dimensions of the workpiece 1 in the width direction and longitudinal direction are also measured to determine whether the workpiece 1 is good or bad. In other words, the displacement sensors 4A and 4B for measuring the workpiece width calculate the widthwise dimension of the workpiece l in the same way as the thickness measurement described above (processing related to the tatami and pattern is usually not performed), and the displacement sensors 4A and 4B for measuring the workpiece width The front end and rear end of the work 1 are detected by the displacement sensors 4A and 4B, and the transport distance of the work 1 between these detections is calculated as the longitudinal dimension of the work 1. Then, each of these values is subtracted from the preset default value, and if the difference value is larger, the determination unit 6 determines that the product is defective due to large waviness or warpage in the width direction or longitudinal direction, and is processed in a later process. be done. Note that the displacement sensors 3A and 3B for thickness measurement may be used as sensors for detecting the longitudinal dimension of the workpiece 1. In addition, as a means of measuring the longitudinal dimension of the workpiece 1, if the transport speed is constant, it may be determined by multiplying the time from detecting the front end of the workpiece 1 to detecting the rear end by the transport speed. , If the conveyance speed is not constant, use an encoder etc. on the conveyance device li! 2 and integrate it.

Effects of the Invention As described above, according to the present invention, displacement sensors for distance measurement are disposed facing each other above and below or on both sides of the plate-shaped workpiece being transported in the lateral direction. The thickness and width dimensions of can be measured accurately and efficiently. In particular, if the work is plate-shaped or has undulations or warps,
Even if there is a pattern on the surface, the thickness can be accurately measured, and pass/fail judgments based on the thickness can be automatically made with high precision. In addition, by measuring the radial direction and longitudinal dimension of the plate-shaped workpiece and determining the state of curvature due to warping or waviness, it is possible to automate the work of determining pass/fail and stabilize the quality.

[Brief explanation of the drawing]

1 and 2 are a schematic block diagram and a schematic perspective view of equipment used in a method for determining the quality of a plate-shaped workpiece according to an embodiment of the present invention, and FIG. 3 is a waveform diagram showing the output of a displacement sensor. . l...Work, 2...Transport device, 3A, 3B, 4A
, 4B...Displacement sensor, 5...Control calculation unit, 6...
・Discrimination part.

Claims (1)

[Claims] 1. Displacement sensors for distance measurement are disposed facing each other above and below the plate-like workpiece that is being transported laterally, and these displacement sensors measure the distance to the workpiece surface, respectively. The thickness of the workpiece is calculated by subtracting the distance to each workpiece surface from the distance between both displacement sensors, and this thickness value is compared with a predetermined thickness value to determine whether the workpiece is good or bad. Method for determining whether work is good or bad. 2. The plate-like workpiece according to claim 1, wherein the maximum thickness or minimum thickness of the workpiece is calculated from the data from both displacement sensors, and this value is compared with a predetermined thickness value to determine whether the workpiece is good or bad. How to judge whether it is good or bad. 3. Displacement sensors for distance measurement are placed facing each other on both sides of the plate-like workpiece being transported in the horizontal direction, and the distances to the sides of the workpiece are measured by these displacement sensors, and the distance between the two displacement sensors is The board is characterized in that the width dimension of the workpiece is calculated by subtracting the distance to the side surface of each workpiece from the distance, and this value is subtracted from a predetermined value, and if the difference value is large, it is determined that the workpiece is defective and has a large curvature in the width direction. A method for determining the quality of workpieces. 4. A sensor that detects the presence or absence of a plate-shaped workpiece is installed near the plate-shaped workpiece that is being transported in the horizontal direction, and the conveyance distance between the front and rear ends of the plate-shaped workpiece is determined by this sensor. The length of the plate-shaped work is calculated by a calculation device, this value is subtracted from a predetermined value, and if the difference value is large, the plate-shaped work is determined to be defective because it has many curved parts in the longitudinal direction. Method.