JP2017151028A - Screw cap winding inspection device and inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method and an inspection device that are capable of detecting a winding failure during a screw cap winding process, in other words, in-line.SOLUTION: This screw cap winding inspection device detects a winding failure occurring due to the completion of a winding operation without winding up to a proper winding position when a screw cap is wound on a container having a thread part, and includes: a control unit that sets a screw cap winding condition; a rotation unit that winds the screw cap on the thread part according to the screw cap winding condition set by the control unit; a measuring device that measures the torque of the rotation part during the winding operation; and an inspection determination unit that analyzes a torque waveform pattern by obtaining a torque value measured by the measuring device during the winding operation.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inspection apparatus and an inspection method capable of detecting a defect in tightening a screw cap.

  In the manufacturing process of a plastic container or the like, there is a process of winding a screw cap around the thread of the container. A screw cap is supplied onto the screw thread of the container, and a tightening operation is performed by contacting and rotating the tightening mechanism with the screw cap.

  Conventionally, in the tightening operation of the screw cap as described above, a torque measuring device is provided in the tightening mechanism, the torque value received by the screw cap during the operation of the tightening mechanism is measured, and rotated until the set torque value is reached. Winding is performed (Patent Document 1). When the measured torque value or the tightening angle exceeds the set value within the set operation time, it is determined that the winding is properly tightened, and the tightening operation is completed. If the measured torque value does not exceed the set value within the set time, an NG determination is made.

  In the above tightening operation, even when the screw cap does not rotate to the proper tightening position, the measurement torque value reaches the set value and an erroneous determination that results in an OK determination occurs, and an outflow of defective tightening products occurs. May occur. As a factor of misjudgment, a peculiar structure of a screw cap and a screw thread is mentioned. Currently, from the viewpoint of universal design, there is an increasing demand for containers with a unique structure, such as installing protrusions on screw caps and parts of screw threads in order to increase awareness of consumers tightening screw caps.

  FIG. 1 is an example of a screw cap and a thread portion having a unique structure. The screw cap and the container have a unique structure having protrusions 1 and 2 respectively. When the screw cap is opened and closed, a force is applied when the projection 1 of the screw cap rides over the projection 2, thereby enhancing the consumer's recognition of opening and closing. On the other hand, it also affects the torque value during the tightening operation in the manufacturing process. If the force when the protrusion 1 of the screw cap gets over the protrusion 2 exceeds the set value, it is before being tightened to the final tightening position. When the operation is completed, winding failure occurs.

  Although there is a method of giving a specific mark to the screw cap and the container side for the winding failure and observing and confirming the positional relationship (Patent Document 2), there is a design limitation, and inspection cannot be performed when the mark cannot be applied.

  In the current manufacturing process, sufficient quality assurance cannot be performed only by the conventional determination at the time of winding and tightening, and a visual inspection is performed for screw cap fitting in a final inspection process before shipment. For this reason, it is a factor of a decrease in production efficiency and an increase in work load.

JP 2003-205998 A JP 2003-276712 A

  The present invention has been made in view of the above problems, and provides an inspection method and an inspection apparatus capable of detecting a winding failure in a step of winding a screw cap, that is, in-line.

  One aspect of the present invention for solving the above-described problem occurs when a screw cap is wound around a container having a threaded portion by completing a tightening operation without being tightened to an appropriate tightening position. A screw cap tightening inspection device that detects a tightening failure and includes a control unit that sets the screw cap tightening conditions and a rotation that tightens the screw cap around the thread according to the tightening conditions set in the control unit. And a measuring instrument for measuring the torque of the rotating part during the tightening operation, and a test determination unit for obtaining the measured torque value during the tightening operation measured by the measuring instrument and analyzing the torque waveform pattern This is a cap tightening inspection device.

  According to the present invention, it is possible to provide an inspection device capable of detecting a screw cap having a unique structure and screw thread tightening and detecting a failure that cannot be overcome the protrusion. Conventionally, visual inspection by inspection personnel required offline inspection for each body in the pre-shipment inspection process, but in-line inspection can be performed using the method of the present invention, which is effective in improving production efficiency and reducing workload. Is.

Schematic diagram of screw cap and container 1 is a configuration diagram of a screw cap tightening inspection device according to an embodiment of the present invention. Example of torque waveform at judgment OK Example of torque waveform at judgment NG

FIG. 2 is a view schematically showing a screw cap tightening inspection apparatus 100 according to an embodiment of the present invention.
In order to solve the above-described problem, the screw cap tightening inspection apparatus 100 rotates the screw cap provided with the protrusion 1 in contact with the workpiece 7 which is a container in which the protrusion 2 and the thread portion are formed. Rotating unit 3 for tightening, control unit 4 for setting conditions for the tightening operation and controlling the rotating unit 3, measuring instrument 5 for measuring the torque value of the rotating unit 3 during the tightening operation, and tightening operation And an inspection determination device 6 for analyzing a torque value at the time and detecting a winding failure.

  The controller 4 sets the rotational speed, operation time, and torque value at the final tightening position of the tightening operation, and rotates the rotating unit 3 in contact with the screw cap supplied on the thread portion to perform the tightening operation. To do. The winding torque value of the rotating unit 3 during operation is measured by the measuring device 5, and the measured value is input to the control unit 4. A measurement value is input to the inspection determination device 6 from the control unit 4.

The inspection determination device 6 performs inspection by data processing of the following [a] to [c] using the torque value during the winding operation.
[A] The torque value during the tightening operation obtained by the measuring device 5 is recorded.
[B] A torque waveform pattern at the time of tightening obtained from the recorded measurement value is registered.
[C] The inspection target torque waveform pattern registered above is compared with a non-defective torque waveform pattern registered in advance in the inspection determination device 6 to determine whether or not the product is good. The measurement of the non-defective torque waveform pattern may also be performed using the measuring instrument 5 in advance.

  In Example 1, as shown in FIG. 1, a screw cap formed with a protrusion 1 that was wound around a container having the protrusion 2 was used as an inspection target. The screw cap and the threaded portion of the container are manufactured by plastic resin molding. The rotating unit 3, measuring instrument 5 and control unit 4 use a Nidec Simpo winding tightening device (model GX301) and a controller (model GX301-CU) to set the set torque value for completing the tightening operation to 1 N · Set to m. The control unit 4 was connected to a PC as the inspection determination device 6 and analyzed the torque value.

  3 and 4 are schematic diagrams of torque waveforms during the tightening operation measured by the inspection apparatus 100 according to the first embodiment. FIG. 3 shows the waveform when the product is non-defective, and FIG. In the case of the non-defective product shown in FIG. 3, after starting the tightening operation, the peak 8 indicating the torque value when the rotating part 3 is seated on the workpiece 7, and the torque value when the protruding part 1 of the screw cap gets over the protruding part of the thread , Peak 9 (the torque value at the final winding position) indicating that the measured torque position has reached the set value at the proper closing position and the winding operation has been completed appears. When the tightening failure shown in FIG. 4 occurs, the measured torque value reaches the set torque value when the projecting portion 1 of the screw cap gets over the projecting portion 2 of the screw thread, and the tightening operation is completed. No peak 9 indicating that the tightening operation has been completed.

  In the first embodiment, a torque waveform pattern during a tightening operation for a non-defective product is registered in advance, and the measured torque waveform pattern to be inspected is compared with a non-defective product torque waveform pattern to determine whether or not the product is good. Specifically, it is possible to detect a winding tightening failure due to the influence of the protrusion without flowing out by inspecting the presence or absence of the peak 9 indicating that the operation is completed at the proper closing position.

  In order to detect the peak 9, for example, the inspection determination device 6 uses the measured torque waveform pattern to set the torque value measurement start time as the tightening start position, the time when the peak 8 appears as the seating position of the rotating unit, and the peak 10 Can be extracted as the position of the protrusion 2 of the container, and the time when the peak 9 appears can be extracted as the tightening position. Extraction of each peak can be performed based on the presence or absence of a peak in the detection range of each peak set based on a non-defective torque waveform pattern (for example, defined by the number of plots and time from the start point). The definition of each peak and the conditions for determining the presence or absence of a peak can be set arbitrarily. For example, when a value smaller than the torque value at an arbitrary time exists for the time set immediately before and immediately after that, the torque value can be defined as a peak value. Also, a moving average line of torque values within a predetermined detection range is calculated, and it can be determined that there is a peak when the difference between the calculated moving average line and the measured torque waveform pattern is equal to or greater than a set value.

  As described above, according to the present invention, with regard to the tightening of the screw cap formed with the protrusion and the container formed with the protrusion, the inspection apparatus that can detect the defect that the protrusion cannot be overcome and cannot be detected. Can be provided. Conventionally, visual inspection by inspection personnel required offline inspection for each body in the pre-shipment inspection process, but in-line inspection can be performed using the method of the present invention, which is effective in improving production efficiency and reducing workload. Is.

  The present invention can be applied to inspections in manufacturing processes of various containers including a screw cap and a thread portion, such as a tube container, a paper container, and a plastic bottle.

1 Protrusion (screw cap)
2 protrusions (containers)
3 Rotating unit 4 Control unit 5 Measuring instrument 6 Inspection / judgment device 7 Workpiece (example tube tube)
8 Peak indicating that the rotating part has come into contact with the screw cap 9 Peak indicating that the tightening operation has been completed at the proper closing position 10 Peak when climbing over the protrusion at the time of winding 100 Screw cap tightening inspection device

Claims (6)

When tightening a screw cap onto a container having a threaded part, it is a screw cap tightening inspection device that detects a tightening failure caused by completing a tightening operation without tightening to an appropriate tightening position. There,
A control unit for setting a tightening condition of the screw cap;
A rotating unit that winds the screw cap around the thread according to the tightening conditions set in the control unit,
A measuring instrument for measuring the torque of the rotating part during the tightening operation;
A screw cap tightening inspection apparatus, comprising: an inspection determination unit that obtains a measured torque value during the tightening operation measured by the measuring instrument and analyzes a torque waveform pattern.   The screw cap tightening inspection device according to claim 1, wherein a winding tightening failure is detected by inputting the measured torque value obtained during the tightening operation to the inspection determination unit via the control unit.   The screw cap tightening inspection device according to claim 1, wherein the container has a threaded portion made of a plastic resin molded product and has a protrusion.   3. The screw cap tightening inspection device according to claim 2, wherein the inspection determination unit detects a winding tightening failure by comparing the obtained torque waveform pattern with a predetermined non-defective torque waveform pattern.   The inspection determination unit detects a winding tightening failure by extracting a winding tightening start position, a seating position of the rotating unit, a position of the protrusion of the container, and an appropriate tightening position from the obtained torque waveform pattern. The tightening inspection device for the screw cap described. When tightening a screw cap onto a container having a threaded portion, a screw cap tightening inspection method that detects a tightening failure that occurs by completing the tightening operation without tightening to the proper tightening position. There,
Measuring the torque during the tightening operation;
Calculating a torque waveform pattern from a torque value measured during the tightening operation;
Registering the torque waveform pattern in an inspection determination unit;
A method for inspecting a tightening of a screw cap, including a step of detecting a tightening failure by comparing the torque waveform pattern with a predetermined good torque waveform pattern.