KR20090019150A - Automatic length correction system of part assembly forming section - Google Patents

Abstract

A system and a method for automatically correcting length deviation of semi-finished products are provided to cut the semi-finished products to proper length by comparing measured lengths of the semi-finished products with a designated reference value of the semi-finished products. A system for automatically correcting length deviation of semi-finished products comprises: a conveyor part including a first conveyor part(100) and a second conveyor part(110) moving PA(Part Assembly) semi-finished products(180); a servo motor(130) controlling the operation of the conveyor part; a cutter(120) cutting the PA semi-finished products; a sensor part including a first sensor(140) and a second sensor(150) positioned above the conveyor part to measure positions of the PA semi-finished products; an encoder(160) measuring lengths of the PA semi-finished products according to the positions of the PA semi-finished products measured by the sensor part; and a control part(170) controlling the servo motor by comparing the lengths of the PA semi-finished products measured by the encoder with the reference value.

Description

Automatic length correction system of part assembly forming section}

1 is a view showing a conventional PA semi-finished transfer conveyor device.

2A and 2B illustrate a semifinished product length deviation primary correction system according to an embodiment of the present invention.

3A and 3B illustrate a semifinished product length deviation secondary correction system according to an embodiment of the present invention.

Figure 4 is a flowchart showing a semi-finished product length deviation automatic correction method according to an embodiment of the present invention.

            <Description of the symbols for the main parts of the drawings>

100: first conveyor 110: second conveyor

120: cutter portion 130: servo motor

140: first sensor 150: second sensor

160: encoder 170: control unit

180: PA semifinished product 190: Cut PA semifinished product

X: Reference value Y1: Primary measurement value

Y2: 2nd measured value α1: 1st correction constant

α2: Secondary correction constant

The present invention relates to a semi-product length deviation automatic correction device which improves productivity by supplying PA semi-finished products of correct length to prevent tires from protruding or inferior defects and automatically adjusting PA length deviations during molding to reduce extra work. .

Conventionally, a sensor is used to sense a starting position, drive a conveyor, and then cut and proceed to a distance of a reference value received from a servo motor to form a semi-finished PA product (see FIG. 1).

However, the deviation of the semi-finished cutting length due to the fine error of the servo motor and the play of the conveyor driving device occurs, and the problem that the tire shrinkage rate after the cutting varies depending on the LOT with time.

An object of the present invention is to install a length measuring device and a sensor in the PA semi-finished product supply line to maintain the appropriate length of the semi-finished product in order to solve the inconvenience of the prior art as described above, the measured length and The present invention provides a semi-finished product length deviation automatic correction device and a method for correcting a semi-finished product cut of an appropriate length.

In order to achieve the above object, in the automatic semi-finished product length deviation correcting apparatus of the present invention, the mechanical error is corrected before measuring and cutting the length of the semi-finished PA product, and after the cutting, the respective deviations according to time and order are removed.

In the present invention includes a conveyor for moving the PA semi-finished product, including a servo motor for controlling the drive of the conveyor, and includes a cutter for cutting the PA semi-finished product. And, positioned on top of the conveyor unit, comprising a sensor for measuring the position of the semi-finished product of the PA, including an encoder for measuring the length of the cut PA semi-finished product according to the position measured by the sensor, the encoder It is preferable that the control unit for controlling the servo motor by comparing the length and the reference value measured by.

In the present invention, the conveyor unit includes a first conveyor for moving the PA semi-finished product before cutting, and preferably includes a second conveyor for moving the PA semi-finished product cut by the cutter.

In the present invention, it is preferable that the cutter is positioned between the first conveyor and the second conveyor.

In the present invention, the sensor unit is located on the top of the first conveyor, including a first sensor for measuring the starting position of the semi-finished product, located on the top of the second conveyor, the position of the end of the cut PA semi-finished product It is preferable to include a second sensor for measuring the.

In the present invention, the sensor unit preferably includes a photo sensor.

In the present invention, it is preferable that the cutter uses an ultraviolet cutter.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

2A and 2B are diagrams illustrating a semi-finished product length deviation primary correction system according to an embodiment of the present invention, and FIGS. 3A and 3B are views illustrating a semi-product length deviation secondary correction system according to an embodiment of the present invention. to be.

2A and 3A, a first conveyor 100, a second conveyor 110, a cutter unit 120, a servo motor 130, a first sensor 140, a second sensor 150, and an encoder 160, the control unit 170, the PA semifinished product 180, and the cut PA semifinished product 190.

The PA semi-finished product 180 is an inner and side semi-finished assembly constituting the molded green tire during the tire manufacturing process, and moves from the upper part of the first conveyor 100 to the upper part of the second conveyor 110.

The first conveyor 100 and the second conveyor 110 are driven by the servo motor 130, and before the PA semi-finished product 180 is cut, the first conveyor 100 and the second conveyor ( 110 is all driven, and after cutting, only the second conveyor 110 is driven to move the cut PA semi-finished product 190.

The cutter unit 120 is positioned between the first conveyor 100 and the second conveyor 110 to cut when the length of the PA semi-finished product is moved by a reference value.

The servo motor 130 controls the driving of the first conveyor 100 and the second conveyor 110 according to the reference value transmitted by the controller 170.

The first sensor 140 and the second sensor 150 are located on the first conveyor 100 and the second conveyor 110, and measure the position of the semi-finished PA 180.

In this case, the first sensor 140 is located on the upper part of the first conveyor 100 to measure the starting position of the semi-finished PA 180, and the second sensor 150 is located on the second conveyor 110. Located at, the start position of the PA semi-finished product 180 and the position of the end of the cut semi-finished product 190 are measured.

The encoder 160 measures the length of the PA semi-finished product 180 to the position measured from the first sensor 140 and the second sensor 150 and transmits the length to the control unit 170.

The controller 170 firstly corrects before cutting by controlling the servo motor 130 and compares the length of the PA semi-finished product received by the encoder 160 with a reference value, and then corrects the second after cutting. do.

Referring to FIG. 2B, the first correction is a deviation (X-Y1) generated by comparing the length of the PA semifinished product measured by the first sensor and the encoder, that is, the primary measured value (Y1) with the reference value (X). By correcting, the correction value obtained by multiplying the deviation X-Y1 by the first correction constant α1 is transmitted to the servo motor to drive the conveyor forward and backward to correct it.

At this time, the value of the first correction constant has a value of 0 <α1 <1, and it is possible to prevent an error generated by the machine according to the first correction.

Referring to FIG. 3B, the secondary correction is a deviation (X-Y2) generated by comparing the length of the cut PA semifinished product measured by the second sensor and the encoder, that is, the secondary measurement value (Y2) and the reference value (X). Multiplied by the second correction constant α2 to obtain a second correction value. In this case, the secondary correction constant has a value of 0 <α2 <1.

The secondary correction value is fed back to the servo motor to correct the reference value during the next PA semifinished product cutting.

The second correction eliminates the variation in time and order by minimizing the change in the length of the PA semifinished product due to the difference in the characteristics of the semifinished product LOT and the change in temperature.

4 is a flowchart illustrating a method for automatically correcting semi-finished product length deviations according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the PA semi-finished product measures the starting position through the first sensor and then moves through the conveyor unit by a reference value stored in the servo motor (S400).

At this time, when the PA semifinished product is moved from the first conveyor to the second conveyor, the starting position of the PA semifinished product is measured through a second sensor.

If the deviation occurs after comparing the transport length measured by the first sensor with the reference value (S410) before cutting the moved PA semifinished product, the conveyor is driven back and forth by the correction value calculated by multiplying the first correction constant. First correction (S420).

The primary correction can eliminate mechanical deviations such as the servo motor and the conveyor.

After cutting the corrected PA semifinished product, only the second conveyor is driven to separate the cut part from the PA semifinished product, and the position of the end of the cut PA semifinished product is measured using a second sensor and transmitted to the encoder.

The length of the cut PA semifinished product is transmitted to the control unit by using the position of the start position and the end of the cut PA semifinished product transmitted to the encoder.

The control unit compares the length of the cut PA semi-finished product with a reference value (S430), corrects the deviation (S440), feeds the correction value back to the servo motor (S450), and corrects the next PA cut.

In this case, when the deviation is corrected by comparing the length of the cut PA semifinished product and the reference value (S430) (S440), the correction value is formed by multiplying a second correction constant, or separately by the length of the PA semifinished product previously cut. The correction value can be obtained by the correction function of.

In this case, the secondary correction value can minimize the change of the measured length value of the semifinished product due to the difference of the characteristics of the semifinished product LOT or the temperature change.

As described above, it has been described with reference to a preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

As described above, according to the present invention, there is an effect of preventing the deviation caused by the failure of the machine by the first correction during the manufacture of the semi-finished PA, and the deviation caused by the characteristics of the semi-finished product by the secondary correction.

In addition, by automatically correcting the deviation by the primary correction and the secondary correction, a separate deviation elimination process is omitted, thereby improving productivity and improving reliability.

And, when the tire is completed, there is an effect of preventing defects such as protrusion or depression in appearance.

Claims (6)

A conveyor unit for moving the PA semi-finished product; A servo motor for controlling driving of the conveyor unit; A cutter for cutting the PA semifinished product; Located in the upper portion of the conveyor unit, the sensor unit for measuring the position of the semi-finished product; An encoder for measuring the length of the cut PA semifinished product according to the position measured by the sensor unit; And And a controller for controlling the servo motor by comparing the length measured by the encoder with a reference value. The method of claim 1, wherein the conveyor unit A first conveyor for moving the PA semi-finished product before cutting; And And a second conveyor for moving the semi-finished product cut by the cutter. The method of claim 2, And the cutter is positioned between the first conveyor and the second conveyor. The method of claim 1, wherein the sensor unit A first sensor located on top of the first conveyor to measure a starting position of the PA semifinished product; And And a second sensor positioned above the second conveyor and measuring a position of an end portion of the cut PA semifinished product. The method of claim 1, The sensor unit automatically corrects the semi-finished product length deviation, characterized in that it comprises a photo sensor. The method of claim 1, The cutter is a semi-finished product length automatic correction device, characterized in that using an ultraviolet cutter.

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