KR20220108928A - Portable Screw Thread Inspection Equipment and Method Thereof - Google Patents

Abstract

A portable screw thread test apparatus is provided. The portable screw thread test apparatus includes: a test posture correction unit informing a test posture state by a gyro sensor such that a probe tap can be coupled with a screw thread of a test subject to be tested in a correct posture; a motor rotating the probe tap mounted to test the screw thread of the test subject; a motor driver driving the motor; a current measurement unit detecting a change in a load current amount of the motor generated during the procedure of coupling the probe tap with the thread of the test subject; and a control unit informing the test posture state through a test posture state display part, transmitting an operation signal to the motor driver, and determining whether a machining state of the screw thread of the test subject is normal, and a defect cause, based on the change in the load current amount of the motor detected by the current measurement unit. Therefore, the present invention is capable of enabling a worker to test a machining state of a screw thread of a subject in a correct testing posture.

Description

Portable Screw Thread Inspection Equipment and Method Thereof

The present invention relates to a portable thread inspection apparatus and method, and more particularly, to a portable thread inspection apparatus and method capable of determining whether an operator is normal or defective by inspecting the processing state of the thread of an object to be inspected in an accurate inspection posture is about

In general, various types of nuts are used in the fastening process of machines and devices. Since the fastening force and airtightness of machines and devices depend on the precision of the nut, precision such as the diameter, depth, and dimension of the thread formed in the nut is very important for the performance of the machine and device.

Due to the development of technology, most electronic devices are downsized in size or scale, and dust-proof and waterproof are becoming common to protect the integrated technology.

As the mobile device also becomes thinner, the speed increases, and the display becomes larger, a bar type cellular phone having a wide and thin shape is widespread, and dustproof and a waterproof function are basically adopted.

Devices with such a thin thickness and a large surface area are vulnerable to shock and distortion, and thus their rigidity is required to be supplemented, and assembly errors are also required precisely to maintain dust and water resistance despite shock and distortion.

However, these devices have a problem in that the assembly error tends to deviate from the allowable tolerance even with a single defective screw thread during the manufacturing process, and has to bear enormous losses due to the assembly defect of the device ahead of the completion stage due to a single defective screw thread.

In order to overcome this, the operator directly inspects the threads while repeating the process of combining and separating bolts one by one from the screw threads of the device. The problem is pointed out that the work speed is not fast and the fatigue of the worker easily increases.

In addition, there is a problem in that it is difficult to accurately couple the bolt in the process of combining the bolt with the screw thread of the device to be inspected by the operator.

Republic of Korea Patent Registration No. 10-1028527

The problem to be solved by the present invention is a portable screw thread inspection that allows an operator to inspect the thread of an inspection object in an accurate inspection posture using a portable thread inspection device to determine whether the processing state of the thread of the inspection object is normal and the cause of failure to provide the device.

Another problem to be solved by the present invention is a portable screw thread that allows an operator to inspect the thread of an object to be inspected in an accurate inspection posture using a portable screw thread inspection device to determine whether the condition of the processing state of the thread of the object to be inspected is normal or defective. An object of the present invention is to provide a thread inspection method using an inspection device.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a portable screw thread inspection device. This portable thread inspection device is equipped with an inspection posture correction unit that notifies the inspection posture state by a gyro sensor to fasten the probe tab to the thread of the object to be inspected in the correct posture, and a probe tab mounted to inspect the thread of the object to be inspected. The motor that rotates the motor, the motor driver that operates the motor, and the current measuring unit that detects the change in the amount of load current of the motor that occur while the probe tap is fastened to the screw thread of the object to be inspected, and the inspection posture correction unit , transmits an operation signal to the motor driver, and based on the change in the amount of load current of the motor detected by the current measuring unit may include a control unit for determining whether the machining state of the thread of the inspection object is normal and the cause of the defect.

The inspection posture correcting unit may include a gyro sensor for measuring an angular velocity of the probe tab with respect to a screw thread of an object to be inspected, and an inspection posture state display unit for displaying a result calculated from the angular velocity measured by the gyro sensor. The examination posture state display unit may show the examination posture state of the probe tab with respect to the thread of the object to be inspected.

The portable screw thread inspection apparatus may include a rotation speed measuring unit for detecting the rotation speed of the motor while the probe tab is fastened to the screw thread of the object to be inspected. The control unit may determine whether there is a defect according to the depth of the thread of the inspection object based on the rotation speed of the motor sensed by the rotation speed measuring unit.

The rotation speed measuring unit may include an encoder that detects the rotation speed of the motor and a voltage converter that matches the voltage between the encoder and the controller.

The portable screw thread inspection apparatus may include an output unit for outputting whether the processing state of the thread of the inspection object determined by the control unit is normal and the cause of the defect to an external device. The output unit may use a USB communication method or an RS-232 communication method.

The motor may be a DC motor.

The motor driver can adjust the rotational force of the motor. The motor driver may be a DC motor driver.

The controller may transmit a control signal to the motor driver to adjust the rotational force of the motor.

The control unit transmits the inspection posture state calculated by the gyro sensor to the inspection posture state display unit, transmits an operation signal to the motor driver, and processes the thread of the inspection object based on the change in the amount of load current of the motor detected by the current measurement unit It may include a microcontroller unit that determines whether the state is normal and a cause of a failure, and a power supply that applies power to operate the microcontroller unit.

The current measuring unit includes an ammeter for measuring the amount of load current of the motor, an amplifier for amplifying the amount of load current measured by the ammeter, and an analog/digital converter for converting the amount of load current of the analog value amplified by the amplifier into the amount of load current of a digital value. may include The ammeter may include a shunt resistor. The amplifier may be an operational amplifier.

In addition, in order to achieve the above other object, the present invention provides a thread inspection method of a portable thread inspection device. In this method, the inspection posture is corrected so that the probe tab is fastened to the thread of the inspection object to be inspected in the correct posture, and when an inspection signal for inspecting the thread of the inspection object is input, the motor equipped with the probe tab is rotated; Sensing the change in the amount of load current of the motor that occurs while the probe tab is fastened to the thread of the object to be inspected in the current measuring unit It may include determining whether the state is normal and the cause of the failure.

Correcting the examination posture so that the probe tab is fastened to the screw thread of the object to be inspected in the correct posture may include performing horizontal calibration and correcting the examination posture by calculating an angular velocity measured by a gyro sensor.

Correcting the test posture by calculating the angular velocity measured by the gyro sensor may include displaying the test posture state through the test posture state display unit and warning the test posture state. To warn of the test incorrect posture state may be to perform a function to notify by vibration.

The method may include setting the rotation direction of the motor by checking the left/right directions of the threads of the object to be inspected before rotating the motor to which the probe tab is mounted.

This method may include detecting the number of revolutions of the motor in the process of fastening the probe tab to the thread of the object to be inspected, and determining whether there is a defect according to the depth of the thread of the object to be inspected in the control unit based on the detected number of revolutions of the motor. have.

The method may include detecting a starting point at which the probe tab is fastened to a thread of the inspection object. Detecting the starting point at which the probe tab is fastened to the thread of the inspection object may be detecting a change in the amount of load current of the motor that occurs when the probe tab starts to be fastened to the thread of the inspection object.

Determining whether or not the machining state of the thread of the inspection object is normal and the cause of the defect based on the detected change in the load amperage of the motor is the slope of the change in the load amperage of the motor that occurs while the probe tap is fastened to the thread of the inspection object; A set range of maximum/minimum or average maximum/minimum values can be used.

This method may include performing a function of visually or audibly notifying the result after determining whether the processing state of the thread of the inspection object is normal and the cause of the defect.

This method includes determining whether the machining state of the thread of the inspection object is normal and the cause of the defect, stopping the motor, rotating the motor in the opposite direction to release the probe tab from the inspection object, and stopping the motor can do.

This method may include outputting whether the processing state of the thread of the inspection object determined by the control unit is normal and the cause of the defect to an external device through the output unit.

As described above, according to the solution to the problem of the present invention, a current measuring unit for detecting a change in the amount of load current of the motor that occurs during a process in which a probe tap mounted on a motor is fastened to a screw thread of an object to be inspected and a control unit for determining whether the processing state of the thread of the inspection object is normal and the cause of the defect based on the change in the amount of load current of the motor detected by the current measurement unit, so that the processing state of the thread of the inspection object can be automatically inspected have. Accordingly, it is possible to provide a portable screw thread inspection device capable of automatically determining whether the processing state of the thread of the inspection object is normal and the cause of the defect.

In addition, according to the solution to the problem of the present invention, by including an inspection posture state display unit that notifies the state of the inspection posture by a gyro sensor to fasten the probe tab to the screw thread of the object to be inspected in the correct posture, An operator can inspect the thread of an object to be inspected in an accurate inspection posture by using a portable thread inspection device. Accordingly, it is possible to provide a portable screw thread inspection device capable of correcting the posture so that the operator can inspect the processing state of the thread of the inspection object in the correct inspection posture.

In addition, according to the solution to the problem of the present invention, the current measurement unit detects a change in the amount of load current of the motor that occurs while the probe tab mounted on the motor is fastened to the screw thread of the object to be inspected, and the motor sensed by the current measurement unit By determining whether the processing state of the thread of the inspection object is normal and the cause of the defect based on the change in the amount of load current of the control unit, the processing state of the thread of the inspection object can be automatically inspected. Accordingly, it is possible to provide a thread inspection method of a portable thread inspection device capable of automatically determining whether the processing state of the thread of the inspection object is normal and the cause of the defect.

In addition, according to the solution to the problem of the present invention, by correcting the inspection posture so as to fasten the probe tab to the thread of the inspection object to be inspected in the correct posture, the operator uses the portable screw thread inspection device to accurately inspect the thread of the object to be inspected. can be inspected. Accordingly, a thread inspection method of a portable thread inspection device capable of correcting the posture so that the operator can inspect the processing state of the thread of the inspection object in the correct inspection posture can be provided.

1 is a schematic block diagram for explaining a portable screw thread inspection apparatus according to an embodiment of the present invention.
Figure 2 is a three-dimensional view of the external configuration for explaining a portable screw thread inspection device according to an embodiment of the present invention.
3A is a block flow diagram for explaining a method of correcting an inspection posture of a portable screw thread inspection apparatus according to an embodiment of the present invention.
Figure 3b is a three-dimensional view for explaining a configuration of a method for correcting the inspection posture of the portable screw thread inspection apparatus according to an embodiment of the present invention.
4 is a block flow diagram for explaining a thread inspection method using a portable thread inspection device according to an embodiment of the present invention.
5A to 5C are graphs for explaining a determination algorithm used in a thread inspection method using a portable thread inspection apparatus according to an embodiment of the present invention.
6A to 6F are graphs showing current waveforms obtained by examining a screw thread for each of the objects to be inspected using a portable screw thread inspection apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein, and may be embodied in different forms. Rather, the embodiments introduced herein are provided so that this disclosure may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art, and the present invention is only defined by the scope of the claims.

Like reference numerals refer to like elements throughout the specification. Accordingly, the same or similar reference signs may be described with reference to other drawings, even if not mentioned or described in the corresponding drawings. In addition, although reference numerals are not indicated, descriptions may be made with reference to other drawings.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, 'comprises' and/or 'comprising' refers to the presence of one or more other components, steps, operations and/or devices mentioned. or addition is not excluded. In addition, since it is according to a preferred embodiment, reference signs provided in the order of description are not necessarily limited to the order.

When an element is referred to as 'connected to' or 'coupled to' with another element, it means that another element is directly connected or coupled to another element or in the middle. Includes all cases involving On the other hand, when one component is referred to as 'directly connected to' or 'directly coupled to' with another component, it indicates that other components are not interposed therebetween. 'and/or' includes each and every combination of one or more of the recited items.

Spatially relative terms 'below', 'beneath', 'lower', 'above', 'upper', etc. It can be used to easily describe a device or component's correlation with another device or component. Spatially relative terms should be understood as terms including different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device shown in the figure is turned over, a device described as 'beneath' or 'beneath' of another device may be placed 'above' of the other device. Accordingly, the exemplary term 'below' may include both the downward and upward directions. The device may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

Further, the embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Accordingly, the shape of the illustrative drawing may be modified due to manufacturing technology and/or tolerance. Accordingly, the embodiments of the present invention are not limited to the specific form shown, but also include changes in the form generated according to the manufacturing process. Accordingly, the regions illustrated in the drawings have a schematic nature, and the shapes of the illustrated regions in the drawings are intended to illustrate specific shapes of regions of the device and not to limit the scope of the invention.

Figure 1 is a schematic block diagram for explaining a portable thread inspection device according to an embodiment of the present invention, and Figure 2 is an external configuration three-dimensional view for explaining a portable thread inspection device according to an embodiment of the present invention to be.

1 and 2 , the portable screw thread inspection apparatus 100 may largely include an inspection posture correcting unit 110 , a motor 120 , a current measuring unit 140 , and a control unit 160 .

The portable screw thread inspection apparatus 100 includes an inspection posture correcting unit 110 that informs the inspection posture state by the gyro sensor 112 so as to fasten the probe tab 10 to the thread of the inspection object to be inspected in the correct posture, and the object to be inspected. A motor 120 that rotates the probe tab 10 mounted to inspect the thread of a motor 120, a motor driver 122 that operates the motor 120, and the probe tab 10 is fastened to the thread of the object to be inspected Transmits a signal for the test posture state to the current measuring unit 140 for detecting a change in the amount of load current of the motor 120 generated in the process, and the test posture correcting unit 110, and transmits an operation signal to the motor driver 122 and may include a control unit 160 that determines whether the machining state of the thread of the inspection object is normal and the cause of the defect based on the change in the amount of load current of the motor 120 detected by the current measuring unit 140 . .

Here, the inspection object may be various parts having a thread. That is, in addition to the nut, other parts having a thread may also be inspected.

The probe tab 10 may be a bolt-type detection member having a thread corresponding to the thread of the object to be inspected.

The inspection posture correcting unit 110 includes a gyro sensor 112 that measures the angular velocity of the probe tab 10 with respect to the thread of the inspection object and an inspection posture state display unit that displays a result calculated from the angular velocity measured by the gyro sensor 112 (114). The inspection posture state display unit 114 may show the inspection posture state of the probe tab 10 with respect to the thread of the object to be inspected.

As shown, the inspection posture state display unit 114 draws a cross solid line corresponding to a calibration line for showing the correct inspection posture state of the probe tab 10 with respect to the thread of the object to be inspected, and the actual position of the probe tab 10 . A cross-dotted line corresponding to the posture line showing the examination posture state may be displayed. However, the present invention is not limited thereto. The inspection posture state display unit 114 of the portable screw thread inspection apparatus 100 according to an embodiment of the present invention displays various types of display methods for showing the correct inspection posture state of the probe tab 10 with respect to the thread of the object to be inspected. can be hired

The motor 120 may be a direct current (DC) motor.

The motor driver 122 may control the motor 110 while adjusting the rotational force of the motor 10 . The motor driver 132 may be a DC motor driver.

The current measuring unit 140 includes an ammeter 142 for measuring the amount of load current of the motor 120 , an amplifier 144 for amplifying the amount of load current measured by the ammeter 142 , and the analog amplified by the amplifier 144 . It may include an analog/digital converter (A/D converter) for converting the load current amount of the value into the load current amount of the digital value. Ammeter 142 may include a shunt resistor. The amplifier 144 may be an operational amplifier (OPAmp).

The control unit 160 sends a signal about the examination posture state to the examination posture correction unit 110 to display the examination posture state on the examination posture state display unit 114 , and a motor driver ( 122) to transmit a control signal.

The control unit 160 transmits a signal for the examination posture state to the examination posture correcting unit 110 , transmits an operation signal to the motor driver 122 , and transmits an operation signal to the motor 110 detected by the current measurement unit 140 . Power for operating the microcontroller unit (MCU) 162, which determines whether the machining state of the thread to be inspected is normal and the cause of the defect based on the change in the amount of load current, and the microcontroller unit 162 A power supply unit 164 for applying may be included. The power supply unit 164 may apply power for driving the motor 120 to the motor driver 122 through the control unit 160 .

The portable screw thread inspection apparatus 100 may include a rotation speed measuring unit 150 for detecting the rotation speed of the motor 110 while the probe tab is fastened to the screw thread of the object to be inspected. The control unit 160 may determine whether there is a defect according to the depth of the screw thread of the object to be inspected based on the rotation speed of the motor 110 detected by the rotation speed measuring unit 150 .

The rotation speed measurement unit 150 may include an encoder 152 that detects the rotation speed of the motor 110 and a voltage converter 154 that matches the voltage between the encoder 152 and the control unit 160 . have. The voltage converter 154 may be a voltage level shifter.

The portable screw thread inspection apparatus 100 may include an output unit 170 that outputs whether the processing state of the thread of the inspection object determined by the control unit 160 is normal and the cause of the defect to an external device. The output unit 170 may use a Universal Serial Bus (USB) communication method or a Recommended Standard (RS)-232 communication method. However, the present invention is not limited thereto. The output unit 170 may use various wired/wireless communication methods capable of transmitting and receiving data to and from an external device. That is, the output unit 170 transmits the data on whether the processing state of the thread of the inspection object determined by the control unit 160 is normal and the cause of the defect to an external device such as a personal computer (PC). It can serve as a channel for confirmation.

Although not shown, the portable screw thread inspection apparatus 100 according to an embodiment of the present invention may be provided with a lamp or a display for displaying whether the processing state of the thread of the inspection object is normal and the cause of the defect.

A portable screw thread inspection apparatus according to an embodiment of the present invention includes a current measuring unit for detecting a change in the amount of load current of a motor generated while a probe tab mounted on a motor is fastened to a thread of an object to be inspected, and a motor detected by the current measuring unit By including a control unit for determining whether the processing state of the thread of the inspection object is normal and the cause of the defect based on the change in the amount of load current of the inspection object, the processing state of the thread of the inspection object can be automatically inspected. Accordingly, it is possible to provide a portable screw thread inspection device capable of automatically determining whether the processing state of the thread of the inspection object is normal and the cause of the defect.

In addition, the portable screw thread inspection apparatus according to an embodiment of the present invention includes an inspection posture state display unit that informs the inspection posture state by the gyro sensor to fasten the probe tab to the thread of the object to be inspected in the correct posture, so that the operator A portable thread inspection device can be used to inspect the thread of an object to be inspected in an accurate inspection posture. Accordingly, it is possible to provide a portable screw thread inspection device capable of correcting the posture so that the operator can inspect the processing state of the thread of the inspection object in the correct inspection posture.

Figure 3a is a block flow diagram for explaining a method of correcting the inspection posture of the portable screw thread inspection apparatus according to an embodiment of the present invention, and Figure 3b is a method of correcting the inspection posture of the portable screw thread inspection apparatus according to an embodiment of the present invention It is a three-dimensional diagram for explaining one configuration.

3A and 3B, in the method of correcting the inspection posture of the portable screw thread inspection apparatus 100, the probe tab 10 is attached to the thread of the inspection object before fastening the probe tab 10 to the thread of the inspection object to be inspected. It may include correcting the examination posture (S100) so as to be fastened to the correct posture.

Calibrating the test posture (S100) to fasten the probe tab 10 to the thread of the test object to be inspected in the correct posture is performing horizontal calibration (S10) and measured with a gyro sensor (see 112 in FIG. 1). It may include correcting the examination posture by calculating the angular velocity (S20, S30, S50, and S60).

Performing the horizontal calibration (S10), as shown in Fig. 3b, after placing the portable screw thread inspection device 100 on a horizontal surface, and then on the thread of the inspection object of the inspection posture state display unit 114 described above. The cross-dot line corresponding to the posture line showing the actual examination posture state of the probe tab 10 may be matched with the cross-dot line corresponding to the calibration line for showing the correct examination posture state of the probe tab 10 for the present invention.

Calibrating the inspection posture by calculating the angular velocity measured by the gyro sensor (S20, S30, S50, and S60) is a portable screw thread inspection device 100 that has completed horizontal calibration (S10), and the operator selects the inspection posture for the thread of the object to be inspected. Adjusting (S20), calculating the angular velocity measured by the gyro sensor by the operator adjusting the inspection posture with respect to the thread of the inspection object (S20) (S30), calculating the angular velocity measured by the gyro sensor (S30) If the result is normal aiming (S40), the operator operates the operation switch (S110), and the result of calculating the angular velocity measured by the gyro sensor (S30) is not normal aiming (S40), check Normal aiming (S40) by displaying the incorrect posture state on the inspection posture state display unit (S50), and warning the inspection incorrect posture in a vibration method (S60), so that the operator adjusts the inspection posture with respect to the thread of the inspection object (S20) ) may include making it happen.

4 is a block flow diagram for explaining a thread inspection method using a portable thread inspection device according to an embodiment of the present invention.

Referring to FIG. 4 , a thread inspection method using a portable thread inspection device (see 100 of FIG. 1 ) is shown.

The thread inspection method is to correct the inspection posture (S100) to fasten the probe tab (refer to 10 in FIG. 2) to the thread of the inspection object to be inspected in the correct position (S100), and an inspection signal for inspecting the thread of the inspection object is input ( S110), moving the probe tab in the direction of the object to be inspected while rotating the motor on which the probe tab is mounted (see 110 in FIG. 1 ), and the probe tab in the current measuring unit (see 140 in FIG. 1 ) on the thread of the object to be inspected Detecting (S120) the change in the amount of load current of the motor that occurs during the fastening process and the control unit (see 160 in FIG. 1) on the basis of the change in the amount of load current of the motor detected by the current measuring unit. It may include determining whether the product is normal or not and the cause of the failure (S130 and S140).

Correcting the inspection posture ( S100 ) to fasten the probe tab (see 10 of FIG. 2 ) to the thread of the object to be inspected in the correct posture is the same as described in FIGS. 3A and 3B .

The inspection signal for inspecting the thread of the inspection object is input (S110) to operate the control unit from the power supply unit (see 164 in FIG. 1) of the control unit, and by applying power for driving the motor can be performed have. That is, an inspection signal for inspecting the thread of the inspection object by the operator pressing the operation switch may be input (S110).

In the thread inspection method, the left/right direction of the thread of the inspection object is checked (S111) before moving the probe tab in the direction of the inspection object while rotating the motor equipped with the probe tab (S121) to determine the rotation direction of the motor. It may include setting (S112 or S113) to forward rotation or reverse rotation.

Based on the change in the amount of load current of the motor detected by the current measuring unit, the control unit determines whether the processing state of the thread of the inspection object is normal or not (S130 and S140) is a process in which the probe tab is fastened to the thread of the inspection object. You can use the slope of the change in the amount of load current of the motor, the maximum value/minimum value, or the set range of the average maximum value/minimum value.

Detecting the change in the amount of load current of the motor that occurs while the probe tab is fastened to the screw thread of the object in the current measurement unit (S120) is to rotate the motor equipped with the probe tab and move the probe tab in the direction of the object to be inspected (S121) ), detecting the starting point at which the probe tab is fastened to the thread of the inspection object (S122), and whether the slope of the change in the amount of load current of the motor occurring in the process of the probe tab being fastened to the thread of the inspection object is less than or equal to a set value Determining (S123), determining whether the maximum/minimum value of the change in the motor's load current is within the set range (S124), and determining whether the average maximum/minimum value of the change in the motor's load current is within the set range ( S125) and detecting the end value of the encoder (see 152 in FIG. 1) indicating the end of the thread inspection (S126). A loop method may be applied to the algorithm for these detection processes. That is, these determination processes may be continuously and repeatedly performed until the end value of the encoder is sensed (S126).

Detecting the starting point at which the probe tab is fastened to the thread of the inspection object in the current measuring unit ( S122 ) may be detecting a change in the amount of load current of the motor that occurs when the probe tab starts to be fastened to the thread of the inspection object.

Detecting (S120) the change in the amount of load current of the motor that occurs while the probe tab is fastened to the thread of the object to be inspected in the current measurement unit is the change in the amount of load current of the motor that occurs while the probe tab is fastened to the thread of the object to be inspected. Determining whether the slope is less than or equal to the set value (S123), determining whether the maximum/minimum value of the change in the motor load current is within the set range (S124), and the average maximum/minimum value of the change in the load current of the motor At least one of determining whether it is within a set range (S125) may be performed.

Based on the change in the amount of load current of the motor detected by the current measurement unit, the control unit determines whether the processing state of the thread of the inspection object is normal or not (S130 and S140) is the microcontroller unit of the control unit (see 162 in FIG. 1) ), the screw thread defect is determined by the reference value for the slope of the change in the amount of load current of the motor, the maximum value/minimum value, or the average maximum value/minimum value that occurs while the probe tab set and stored in the thread is fastened to the thread of the object to be inspected (S130) Or it may be determined that the thread is normal (S140).

These reference values may be set and stored in the microcontroller unit of the control unit in advance for the inner diameter and depth of the threads of each of the various inspection objects.

The thread inspection method determines whether the machining state of the thread of the inspection object is normal and the cause of the defect (S130 and S140), then stops the motor (S150), and rotates the motor in the opposite direction (S170) to remove the probe from the inspection object. It may include releasing the tab, and stopping the motor ( S180 ).

The thread inspection method determines whether the processing state of the thread of the inspection object is normal and the cause of the defect (S130 and S140), and then visually or audibly informs the result (S161) while the motor is stopped (S150). It may include performing a function. That is, the thread inspection method using the portable thread inspection device according to an embodiment of the present invention outputs (S160) the result of determining whether the processing state of the thread of the inspection object is normal and the cause of the defect (S130 and S140) can include

If the result of determining whether the machining state of the thread of the object to be inspected is normal and the cause of the defect (S130 and S140) is normal, the light emitting diode (LED), which is a lamp indicating that the machining state of the thread is normal, turns on. (S162), and if it is defective, the light emitting diode, which is a lamp indicating that the processing state of the screw thread is defective, may be turned on (S163). In addition, in the thread inspection method using a portable thread inspection device according to an embodiment of the present invention, when the result of determining whether the processing state of the thread of the inspection object is normal and the cause of the defect (S130 and S140) is bad, the thread While the light emitting diode, which is a lamp indicating that the processing state of the is turned on (S163), may further include operating a buzzer so that an additional warning sound is sounded (S164).

The thread inspection method using a portable thread inspection device according to an embodiment of the present invention detects the number of revolutions of the motor while the probe tab is fastened to the screw thread of the object to be inspected, and based on the detected number of revolutions of the motor, the control unit controls the object to be inspected. It may further include further determining whether a defect according to the depth of the screw thread.

In addition, the thread inspection method according to an embodiment of the present invention outputs whether the processing state of the thread of the inspection object determined by the control unit is normal and the cause of the defect to an external device through the output unit (see 170 of FIG. 1) may further include

In the thread inspection method using a portable thread inspection device according to an embodiment of the present invention, a change in the amount of load current of the motor that occurs during a process in which a probe tab mounted on a motor is fastened to a thread of an object to be inspected is detected by the current measuring unit, and Based on the change in the amount of load current of the motor sensed by the current measuring unit, the control unit determines whether the processing state of the thread of the inspection object is normal and the cause of the defect, so that the processing state of the thread of the inspection object can be automatically inspected. Accordingly, a thread inspection method capable of automatically determining whether the processing state of the thread of the inspection object is normal and the cause of the defect may be provided.

In addition, the thread inspection method using a portable thread inspection device according to an embodiment of the present invention corrects the inspection posture to fasten the probe tab to the thread of the inspection object to be inspected in the correct position, so that the operator uses the portable thread inspection device Thus, it is possible to inspect the thread of the object to be inspected with an accurate inspection posture. Accordingly, a thread inspection method of a portable thread inspection device capable of correcting the posture so that the operator can inspect the processing state of the thread of the inspection object in the correct inspection posture can be provided.

5A to 5C are graphs for explaining a discrimination algorithm used in a thread inspection method using a portable thread inspection apparatus according to an embodiment of the present invention.

The graphs show the current waveforms measured by the current measurement unit (140 in FIG. 1) of the portable screw thread inspection apparatus (see 100 in FIG. 1) according to an embodiment of the present invention, respectively.

In the graph, the x-axis corresponding to the horizontal axis represents the inspection time, and the y-axis corresponding to the vertical axis represents the amount of load current of the motor (see 120 in FIG. 1 ) as a current value.

FIG. 5A may be a graph corresponding to a set inclination value (red solid line) for a change in the amount of load current of the motor that occurs while the probe tab (refer to 10 of FIG. 2 ) is fastened to the screw thread of the object to be inspected.

If the slope of the change in the amount of load current of the motor in the section where the probe tap is fastened to the thread of the object to be inspected (green dotted circle) exceeds the set value, the inspection object is judged as defective, and if it is less than the set value, the inspection object is can be determined to be normal.

5B may be a graph corresponding to a set maximum/minimum value range (red solid line) for a change in the amount of load current of the motor that occurs while the probe tab is fastened to the screw thread of the object to be inspected.

If the maximum or minimum value of the change in the amount of load current of the motor in the section where the probe tap is fastened to the thread of the object to be inspected (circle with green dotted line) is out of the set maximum/minimum value range, the object to be inspected is judged as defective, and within the set range If it is within the range, the test object can be determined as normal.

FIG. 5C may be a graph corresponding to a set average maximum/minimum value range (red dotted line) for a change in the amount of load current of the motor that occurs while the probe tab is fastened to the screw thread of the object to be inspected.

If the average value (yellow solid line) of the change in the amount of load current of the motor in the section where the probe tap is fastened to the thread of the inspection object (green dotted circle) is out of the set average maximum value/minimum value range, the inspection object is determined as defective, and If it is within the set range, the inspection object can be determined as normal.

6A to 6F are graphs showing current waveforms obtained by examining a screw thread for each of the objects to be inspected using a portable screw thread inspection apparatus according to an embodiment of the present invention.

Referring to FIGS. 6A to 6F , graphs showing respective current waveforms obtained by inspecting the threads for various inspection objects are shown.

6A is a graph showing a current waveform (green) obtained by driving a motor (see 120 in FIG. 1 ) equipped with a probe tab (see 10 in FIG. 2 ) and inspecting a reference object having a thread determined in advance to be normal.

This graph may be set and stored in the microcontroller unit (see 162 in FIG. 1) of the control unit (see 160 in FIG. 1) to serve as a reference value for normal determination and defective determination with respect to the threads of other inspection objects.

The first peak corresponds to the amount of load current of the motor that occurs when the motor equipped with the probe tab starts rotating from a standstill, and the second peak is when the probe tab is fastened to the end of the thread of the reference object. It corresponds to the amount of load current of the generated motor.

6B is a graph showing a current waveform (orange) in which a screw thread is inspected for an inspection object having a thread depth of about 10 mm shorter than that of a reference target object determined in advance to be normal.

In this graph, it can be seen that a new peak occurs between the first and second peaks. Therefore, it can be seen that the thread of the inspection object has a depth that is insufficient than the depth of the thread of the reference object having a thread determined in advance to be normal.

6C is a graph showing a current waveform (orange) in which a screw thread is inspected for an inspection object having a poor entry point of the screw thread.

In this graph, it can be seen that a new peak occurs immediately after the first peak. Therefore, it can be seen that the entry of the thread of the inspection object has a different type of defect than the entry of the thread of the reference object having the thread determined in advance to be normal.

6D is a graph showing a current waveform (orange) in which a screw thread is inspected for an inspection object in which a screw thread is not formed.

In this graph, it can be seen that a new peak occurs after the second peak. Therefore, it can be seen that the inspection object has a defect in which the thread of the reference object having the thread determined in advance to be normal is not formed.

6E is a graph showing a current waveform (orange) in which a screw thread is inspected for an inspection object having a thread depth of about 5 mm, which is much shorter than the depth of a thread thread of a reference object determined in advance to be normal, similar to FIG. 6B.

In this graph, it can be seen that a new peak adjacent to the first peak occurs between the first peak and the second peak as compared with FIG. 6B . Accordingly, it can be seen that the thread of the inspection object has a depth that is very insufficient than the depth of the thread of the reference object having a thread determined in advance to be normal.

6F is a graph showing a current waveform (orange) in which a thread is inspected for an inspection object having a thread similar to that of a reference object previously determined to be normal.

In this graph, it can be seen that a new peak adjacent to the second peak occurs between the first and second peaks. Accordingly, it can be seen that the thread of the inspection object is similar to the thread of the reference object having the thread determined in advance to be normal. That is, the machining state of the thread of the inspection object having the current waveform shown in this graph may be determined to be normal.

In the process of inspecting the thread of the object to be inspected, various other current waveforms may appear in addition to the current waveforms of each of the graphs shown in FIGS. 6A to 6F . Even for these other current waveforms, the cause of defects in the thread of the inspection object may be identified by analyzing the change in the amount of load current of the motor that occurs while the probe tab mounted on the motor is fastened to the thread of the inspection object.

That is, the thread inspection method using the portable thread inspection apparatus according to an embodiment of the present invention detects a change in the amount of load current of the motor generated while the probe tab is fastened to the thread of the inspection object, thereby processing the thread of the inspection object. It can be determined whether it is normal or not and various causes of failure.

Above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: probe tab
100: portable thread inspection device
110: inspection posture correction unit
112: gyro sensor
114: inspection posture state display unit
120: motor
122: motor driver
140: current measuring unit
142: ammeter
144: amplifier
146: analog/digital converter
150: rotation speed measurement unit
152: encoder
154: voltage converter
160: control unit
162: microcontroller unit
164: power supply
170: output unit

Claims (5)

an inspection posture correcting unit for notifying the state of the inspection posture by the gyro sensor so as to fasten the probe tab to the thread of the object to be inspected in the correct posture;
a motor rotating the probe tab mounted to inspect the thread of the inspection object;
a motor driver for operating the motor;
a current measuring unit for detecting a change in the amount of load current of the motor generated while the probe tab is fastened to the screw thread of the object to be inspected; and
Notifying the inspection posture state to the inspection posture correction unit, transmitting an operation signal to the motor driver, and based on the change in the amount of load current of the motor detected by the current measurement unit A portable screw thread inspection device including a control unit for determining whether or not the cause of the defect is normal. The method of claim 1,
Comprising a rotation speed measuring unit for detecting the rotation speed of the motor while the probe tab is fastened to the screw thread of the object to be inspected,
The control unit is a portable screw thread inspection device for determining whether a defect according to the depth of the screw thread of the object to be inspected based on the number of revolutions of the motor detected by the revolution number measurement unit. The method of claim 1,
A portable screw thread inspection device including an output unit for outputting whether the processing state of the thread of the inspection object determined by the control unit is normal and the cause of the failure to an external device. correcting the examination posture so that the probe tab is fastened to the screw thread of the object to be inspected;
rotating a motor equipped with a probe tab when an inspection signal for inspecting the thread of the inspection object is input;
detecting, by a current measuring unit, a change in the amount of load current of the motor occurring while the probe tab is fastened to the screw thread of the object to be inspected; and
Thread inspection method of a portable thread inspection device, comprising determining whether the processing state of the thread of the inspection object is normal or defective in the control unit based on the change in the amount of load current of the motor detected by the current measurement unit. 5. The method of claim 4,
In a process in which the probe tab is fastened to the screw thread of the inspection object, the control unit determines whether there is a defect according to the depth of the screw thread of the object to be inspected based on the sensed rotation number of the motor. A thread inspection method of a portable thread inspection device comprising:

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