KR20090015750A - Position recognition system using RDF and machine tool safety device using the same. - Google Patents

Abstract

A position recognition system using RFID and a machine tool safety device using the same are disclosed. A position recognition system using RFID includes a transceiver for outputting a reference signal with an RFID tag; An RFID tag for outputting a tag signal reflecting the reference signal; A plurality of receivers for sensing the tag signal; And a controller configured to calculate 3D position information of the RFID tag based on a tag signal detected by the plurality of receivers. This enables location recognition with improved accuracy and position recognition rates, and can be applied to machine tool safety devices to reduce money and labor losses.

Description

Position recognition system using RDF and machine tool safety device using the same. {System for locating using RFID and safety apparatus of machine tool using the system}

The present invention relates to a position recognition system using RFID, and more particularly, to a three-dimensional position recognition system using RFID and a machine tool safety device using the same.

RFID stands for Radio Frequency Identification and is an identification device using radio frequency. It is possible to transmit data by using magnetic or electric field without electrical contact, and there is no mechanical contact, so there is no friction damage, less pollution or environmental influence, and can pass through non-metallic materials. have. In addition, it is possible to recognize the moving object moving at high speed because it can be recognized at high speed. Therefore, the position recognition devices using RFID have been developed. In the case of the conventional position recognition device using RFID, it is limited to two-dimensional position recognition, and there is a problem that the error range is large and the reliability is low because the fragments of the signals remain at the processing level.

In addition, the safety device of the machine tool according to the prior art can be largely divided into an analog safety device or an infrared use safety device. In these cases, when an object comes into contact with the safety device, the sensor recognizes it and the system recognizes the contact. It works through this stopping principle. In the case of the safety device of the machine tool according to the prior art, there is a risk of an operator accident due to an error of the device or a malfunction of the sensor, which may cause economic loss such as additional fraud, such as a decrease in morale and compensation costs. It was. In addition, the system is stopped due to overreaction such as a system stop sensor and infrared rays, which lowers work efficiency and results in economic disadvantages due to loss of opportunity cost. In addition, in the case of a safety method using the on / off method of the machine tool, it is possible to pursue the simplicity of the configuration, but there was a disadvantage that can not accumulate the same behavior pattern of the operator in the database after the accident.

Accordingly, the present invention provides a position recognition system having accuracy and high position recognition rate through three-dimensional position recognition using RFID and a machine tool safety device using the same.

In addition, the present invention provides a location recognition system and a machine tool safety device using the same to reduce the loss of money and manpower caused by the error occurring in the conventional safety device.

In addition, by providing a separate storage unit to secure the reproducibility of accidents that may be, it provides a position recognition system and machine tool safety device using the same can be used for industrial safety education.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

According to an aspect of the present invention, a position recognition system using RFID includes a transceiver for outputting a reference signal to an RFID tag; An RFID tag for outputting a tag signal reflecting the reference signal; A plurality of receivers for sensing the tag signal; And a controller configured to calculate 3D location information of the RFID tag based on a tag signal detected by the plurality of receivers. The communication unit may further include a communication unit outputting the tag signal to the control unit. The communication unit may be a wired or wireless communication device, and may further include a storage unit storing the 3D location information calculated by the control unit. have.

The RFID tag may be attached or detached, and the controller may be configured based on a relationship between a time delay according to a time difference between arrival of the tag signal from the RFID tag to the plurality of receivers and the speed of the tag signal. 3D location information of the RFID tag may be obtained, and an error calculator may be further included to correct any one of an environment variable, a Doppler effect, an error caused by the receiver, and a combination thereof. The plurality of receivers may be at least four.

According to another aspect of the present invention, a safety device for a machine tool using a position recognition system using RFID includes a transceiver for outputting a reference signal to an RFID tag; An RFID tag outputting a tag signal reflecting the reference signal and attached to the body; A plurality of receivers for sensing the tag signal; A controller configured to calculate 3D position information of the RFID tag based on a tag signal detected by the plurality of receivers; And a warning unit configured to perform a warning operation corresponding to the control signal of the controller.

In addition, the communication unit for outputting the tag signal to the control unit, a storage unit for storing the three-dimensional location information calculated by the control unit may be further included, the communication unit is a wired or wireless communication device or the storage unit the three-dimensional location information And store safety / danger radius information of the machine tool, wherein the safety / danger radius information of the machine tool is set based on the three-dimensional position information. At this time, the fuselage may be the machine tool or the user safety clothing and the user safety clothing may be any one of gloves, hats, clothing and combinations thereof.

The controller may obtain three-dimensional position information of the RFID tag based on a relationship between a time delay resulting from a time difference between the tag signals arriving at the plurality of receivers from the RFID tag, respectively, and the speed of the tag signal. The number of the plurality of receivers may be at least four. The apparatus may further include an error calculator configured to correct any one of an environmental variable, a Doppler effect, an error caused by the receiver, and a combination thereof, or the warning operation may be any one of a warning sound output, a warning lamp emission, and a speed control operation. have.

According to the position recognition system using the RFID and the machine tool safety device using the same according to the present invention can provide a position recognition system with improved accuracy and position recognition rate and a machine tool safety device using the same.

In addition, it is possible to provide a location recognition system using RFID and a machine tool safety device using the same that can reduce money loss and manpower loss.

In addition, it is possible to provide a location recognition system using RFID and a machine tool safety device using the same, which can be variously utilized for industrial safety education by securing reproducibility when an industrial accident occurs.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals regardless of the reference numerals. Duplicate explanations will be omitted.

Hereinafter, a configuration of an RFID tag used in a location recognition system using RFID according to an embodiment of the present invention will be described with reference to FIG. 1. 1 is a block diagram of an RFID tag used in a location recognition system using RFID according to an embodiment of the present invention. Hereinafter, the configuration of the RFID tag to be described is only one embodiment of the present invention, it is clear that the present invention is not limited thereto.

The RFID tag includes an antenna 110 for emitting or receiving a predetermined radio frequency signal, a transmission / reception module 150 for modulating and demodulating a predetermined radio frequency signal, a memory 130 storing a unique identification number of the RFID tag, It includes a control logic 140 for controlling the transmission and reception module 150 and the memory 130, and a power supply unit 120 for supplying the driving power of each part of the RFID tag.

The RFID tag is classified into an active method, a passive method, and a hybrid method according to the driving method of the antenna 110 and the power supply unit 120. In the active method, the antenna 110 includes an oscillation circuit to output a signal, and the power supply unit 120 is A method of providing power to an oscillation circuit with a battery. On the other hand, the passive method is a method in which the power supply unit 120 regenerates power by using propagation energy of a reference signal output from a transceiver to be described later. In addition, the hybrid method combines these active and passive features. However, the RFID tag used in the present invention can be any of passive, active or hybrid.

When the signal input from the antenna 110 is a predetermined radio frequency signal, the control logic 140 transmits and receives the transmission / reception module 150 and the antenna 110 so that a response signal corresponding to the unique identification number stored in the memory is output with a constant strength. ). In this case, the signal input from the antenna 110, that is, the signal input to the RFID tag is referred to as a reference signal, and then the response signal output corresponding to the unique identification number will be referred to as a tag signal. Hereinafter, the reference signal and the tag signal are used as above.

Hereinafter, a configuration of a location recognition system using RFID according to an embodiment of the present invention will be described with reference to FIG. 2. 2 is a block diagram of a location recognition system using RFID according to an embodiment of the present invention.

In the case of a position recognition system using RFID, the transceiver 210, the RFID tag 220, the plurality of receivers 231, 232, 233, and 234, the communication unit 240, the control unit 250, the storage unit 260, and an error. The calculation unit 270 may be included.

The transceiver 210 outputs a reference signal to the moving RFID tag 220. The reference signal output from the transceiver 210 is later reflected by the RFID tag 220 and output as a tag signal, and the position of the RFID tag 220 can be calculated based on the tag signal. In this case, the reference signal output from the transceiver 210 may be one of waves such as electromagnetic waves and sound waves.

The above-described RFID tag 220 receives a reference signal output from the transceiver 210 and outputs a tag signal corresponding to the identification information stored in the RFID tag 220. Such a tag signal is a signal that is the basis for calculating the position of the RFID tag 220 according to an embodiment of the present invention. The tag signal output from the RFID tag 220 is input to the plurality of receivers 231, 232, 233, and 234. According to an embodiment of the present invention, the RFID tag 220 may be manufactured in a form capable of being attached or detached to an object, and the RFID tag 220 is attached to the moving object to more easily track the position of the moving object. Can be.

The number of receivers 231, 232, 233, and 234 is not limited as long as the number of receivers is at least four or more. However, at least four receivers 231, 232, 233, and 234 must be present in order to calculate the position of the RFID tag 220 based on the tag signals input to the receivers 231, 232, 233, and 234. A method of calculating the position of the RFID tag 220 will be described later. The tag signals input to the plurality of receivers 231, 232, 233, and 234 are sent to the controller 250 via the communication unit 240.

In this case, the communication unit 240 may connect the control unit 250 and the plurality of receivers 231, 232, 233, and 234 by wire, or may connect wirelessly. In addition, even if the communication unit 240 does not exist, it may be directly connected to the control unit 250 by wire or wirelessly. According to an embodiment of the present invention, the communication unit 240 may be Bluetooth or Zigbee. However, the present invention is not limited thereto, and any device capable of wire / wireless communication may be applicable to the present invention.

The control unit 250 is based on the relationship between the time delay according to the time difference between the arrival of the tag signal from the RFID tag 220 to the plurality of receivers 231, 232, 233, 234 and the speed of the tag signal. Three-dimensional positional information of 220 can be obtained. 3D position information of the RFID tag 220 that is moved by using the speed of the tag signal reflected from the RFID tag 220 and the 3D coordinates corresponding to the positions of the plurality of receivers 231, 232, 233, and 234. You can get it. At this time, the same tag signal and the reference signal have the same speed, so that the relative distance with the plurality of receivers is proportional to the time difference. That is, the following relationship exists.

As shown in Equation 1, the speed of the tag signal corresponds to the relative distance of the plurality of receivers 231, 232, 233, and 234, that is, the distance between the plurality of receivers, to the plurality of receivers 231, 232, 233, and 234. Is equal to the difference in the time of arrival, ie divided by the value of the time delay. In this case, Equation 2 below is derived from Equation 1.

In other words, it can be seen that there is a proportional relationship between the relative distance and the time delay. Through this, the control unit 250 may calculate the position of the RFID tag 220. This will be described later with reference to FIG. 3.

The storage unit 260 stores the three-dimensional position information calculated by the controller as described above. The stored position information of the RFID tag 220 is used later to analyze the movement pattern of the RFID tag 220 or the like and to compensate for the problem of the position recognition system according to the exemplary embodiment of the present invention.

The error calculator 270 may be configured to include structural errors due to errors of devices such as the RFID tag 220 and receivers 231, 232, 233, and 234, and errors due to environmental variables such as temperature, humidity, and air pressure. When 220 is moved, it corrects an error that may occur in a position recognition system using RFID, such as an error caused by a Doppler effect or a signal interference due to a moving body. Therefore, the error calculation unit 270 is additionally included to enable more accurate location tracking.

Hereinafter, the operation of the control unit used in the position recognition system using RFID and the machine tool safety device using the same according to an embodiment of the present invention with reference to FIG. 3 is a control flowchart illustrating a flow of an operation of a control unit used in a position recognition system using RFID and a machine tool safety device using the same to recognize a 3D position of an RFID tag according to an embodiment of the present invention.

First, the positions of the plurality of receivers are applied to three-dimensional coordinates to store this value (S310). In other words, the positions of the plurality of receivers are represented in three-dimensional coordinates. For example, four receivers A, B, C, and D are A for (0,0,0), B for (10,0,0), C for (0,10,0), and D If is located at (10, 10, 0), stores the three-dimensional position coordinates of each receiver.

Thereafter, it is determined whether a tag signal output from the RFID tag is input to all of the plurality of receivers A, B, C, and D (S320). This is because the tag signal must be input to all receivers to obtain three-dimensional position information of the RFID tag later based on the time when the tag signal is input to each receiver. When the tag signal is input to all of the plurality of receivers, a time delay between the time when the tag signal is input to each receiver, that is, the time when the tag signal arrives at each receiver is calculated (S330). The time delay is the difference between the times of arrival at each receiver.

The position of the RFID tag is calculated using the time delay value (S340). At this time, in order to calculate the position of the RFID tag, it is possible to obtain the position of the RFID tag in three-dimensional coordinates using the relationship of Equation 2 described above.

Hereinafter, an RFID tag position recognition method using Equation 2 will be described in detail. For example, assume that the positions of the receivers R1, R2, and R3 are respectively (x1, y1, z1), R2 is (x2, y2, z2), and R3 is (x3, y3, z3). At this time, each receiver position is a constant value storing previously measured position values.

Accordingly, the time at which the tag signal arrives at each receiver in the RFID tag is obtained by using Equation 1 as described above.

t1 = | R1-X | / c

t2 = | R2-X | / c

t3 = | R3-X | / c

At this time, t1 is the arrival time from the RFID tag to R1, t2 is the arrival time from the RFID tag to R2, and t3 is the arrival time from the RFID tag to R3. Coordinate X is also a coordinate (x, y, z) indicating the position of the RFID tag for which we want to recognize the position. In addition, | R1-X | represents the distance between the receiver R1 and the RFID tag, | R2-X | represents the distance between the receiver R2 and the RFID tag, and | R3-X | represents the distance between the receiver R3 and the RFID tag. And c is a constant indicating the speed of the tag signal.

Since the time delay is the difference in the time that the tag signal arrives in each receiver, the time delays ta, tb, and tc are as shown in Equation 4 below.

ta = t1-t2

tb = t2-t3

tc = t3-t1

Therefore, using Equations 3 and 4, Equations 5 below can be obtained.

| R1-X |-| R2-X | = ta × c

| R2-X |-| R3-X | = tb × c

| R3-X |-| R1-X | = tc × c

At this time, since | R1-X |, | R2-X |, and | R3-X | are distances between two coordinates, they may be represented by Equation 6 below.

Therefore, by substituting the value of Equation 6 into Equation 5, the coordinates (x, y, z) representing the position of the RFID tag can be obtained using the ternary quadratic system. Therefore, if there are three receivers as described above, the value of coordinates (x, y, z) indicating the position of the RFID tag can be obtained, but the coordinates (x, y, z) indicating the position of the RFID tag obtained by the two are The dog will exist. That is, since only one of the two positions thus obtained is the position of the RFID tag we want to know, at least four receivers must exist to recognize the position of the RFID tag as one.

If you think geometrically, if you can calculate the distance from a point, you can specify a sphere around the receiver, and if you can calculate the distance from two receivers separately, you can calculate the overlapping line of the sphere around the two receivers. Here, we can identify it as a circle in space. In addition, if the distance can be calculated in three receivers on this principle, two points can be specified on the distance of three receivers. Therefore, if you operate on four receivers, you can specify one point.

However, if there are three receivers and the RFID tag is located only inside or outside the plane passing through the three receivers, that is, if the RFID tag is located only inside or outside the plane that the receivers form, At least three receivers can accurately identify the location of an RFID tag. If an RFID tag is located at a point inside or outside of a plane made by three receivers, the time to reach each receiver at that point and the point opposite to the plane is the same. I can't recognize it. However, if the moving range of the RFID tag is limited inward or outward of the plane made by the three receivers in advance, at least three receivers can accurately recognize the position of the RFID tag.

However, the position recognition system using RFID and the machine tool safety device using the same according to an embodiment of the present invention do not limit the moving range of the RFID tag to the inside or the outside of the plane made by the plurality of receivers. Should be able to recognize the exact location of the RFID tag. However, as described above, if the range in which the RFID tag is moved is limited to the inside or the outside of the plane formed by the plurality of receivers, it is clear that at least three receivers can recognize the exact position of the RFID tag.

Hereinafter, a configuration of a safety device of a machine tool using a position recognition system using RFID according to an embodiment of the present invention will be described with reference to FIG. 4. 4 is a block diagram of a safety device of a machine tool using a position recognition system using RFID according to an embodiment of the present invention.

In the safety device of a machine tool using a position recognition system using RFID according to an embodiment of the present invention, since the basic configuration is the same as the position recognition system using RFID described above with reference to FIG. Duplicate descriptions will be omitted for convenience of description.

The safety device of a machine tool using a position recognition system using RFID includes a transceiver 210, an RFID tag 220, a plurality of receivers 231, 232, 233, 234, a communication unit 240, a control unit 250, and a storage unit. The unit 260, an error calculator 270, and a warning unit 280 may be included. The basic principle of the safety device of the machine tool using the position recognition system using RFID is the same as the principle of calculating the three-dimensional position of the RFID tag 220 of the position recognition system using the above-described RFID.

According to one embodiment of the invention RFID tag 220 is attached to the fuselage. Here, the fuselage refers to a moving object. If a part of the user's body moves and the machine tool is stopped when the machine tool is used, it may be a safety garment worn by the user for safety. At this time, the safety clothing may be any one of gloves, hats or clothing. By tracking the position of the RFID tag 220 attached to the safety clothing of the user who uses the machine tool, the user's movement pattern and the like can be known, and the user can also know whether the user is located within the danger radius of the machine tool. Will be. If the user is stationary when the machine tool is in use and the machine tool moves, the fuselage becomes the machine tool. At this time, the RFID tag 220 is attached to the machine tool to track the position of the machine tool. It is possible to determine whether the location is within a danger radius that may be dangerous to the user. This will be described later in more detail.

In the case of the storage unit 260, the 3D location information of the RFID tag 220 calculated through the above-described process in the controller 250 may be stored, or information about the safety / danger radius of the machine tool may be stored. . At this time, the safety / hazard radius of the machine tool is initially stored in the storage of the machine tool. When the fuselage becomes the user's safety clothing, if the safety clothing of the user comes within a certain position, the position of the machine tool is close to the danger. This is the value that can be set. Conversely, when the fuselage becomes a machine tool, the safety / danger radius of the machine tool is a value that sets a range in which the safety of the user may be threatened when the position of the operating machine is within a certain range. Hereinafter the safety / danger radius of the machine tool is used in the same sense as above. The safety / hazard radius of the machine tool may be set in relation to the 3D location information of the RFID tag 220 stored in the storage unit, the size of the machine tool, the characteristics of the operation, and the like. In addition, it can be classified and stored in two categories, safety and danger radius, and in the case of danger radius, it can be stored in more detail according to the degree of danger.

The warning unit 270 operates based on the safety / danger radius of the machine tool stored in the storage unit 260 described above. That is, when the fuselage is in the danger radius, the warning unit 270 may generate a warning sound or turn on the warning lamp to enable the user to evacuate the danger. Alternatively, the warning unit 270 may include a device capable of adjusting the operating speed of the machine tool, thereby controlling the speed of the operating machine slowly. For example, if you divide the safety / danger radius of a machine tool into two, if it is determined that the fuselage is in the danger radius, you can slow down the machine tool and stop it or stop it immediately. In the case of dividing according to each step, the speed of the moving machine can be adjusted step by step according to each step. The operation of the warning unit 270 is not limited to the warning sound, warning lamp, and speed control, and any operation can be applied to the present invention as long as the user can recognize and evacuate the danger by the operation of the warning unit 270. . Through the operation as described above it is possible to promote the safety of the user using the machine tool.

Hereinafter, a configuration of a machine tool safety device using an actual RFID according to an embodiment of the present invention will be described with reference to FIG. 5. 5 is a block diagram of a machine tool safety device using RFID according to an embodiment of the present invention.

In the case of the machine tool illustrated in FIG. 5, as the spindle 540 rotates, the tool 550 moves up and down. As the tool 550 moves up and down, the user's hand holding the object 560 may be exposed to danger. At this time, the RFID tag is attached to the fuselage, where the fuselage is the tool 550, and thus the three-dimensional position of the tool 550 is calculated by the controller using the RFID tag attached to the tool 550. And when the result of the calculation tool 550 enters the danger radius, the user can be notified of the danger through the warning sound or warning lamp to evacuate. Alternatively, by stopping the operation of the tool 550 or by slowly controlling the vertical movement speed of the tool, the user can avoid the danger. At this time, the X-axis 510 for obtaining the three-dimensional position is the left-right direction, the Y-axis is the direction (⊙, 520) to enter the ground, Z-axis 530 is the longitudinal direction. Accordingly, the three-dimensional position coordinate value of the tool 550 becomes coordinates based on the above-described X, Y, and Z axes. However, when the tool 550 operates up and down in this manner, the position with respect to the Z axis becomes more important than anything. By attaching the RFID tag to the moving body, the RFID system can be applied to the machine tool safety device.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is a block diagram of an RFID tag used in a location recognition system using RFID according to an embodiment of the present invention.

2 is a block diagram of a location recognition system using RFID according to an embodiment of the present invention.

3 is a control flowchart illustrating a flow of an operation of a control unit used in a position recognition system using RFID and a machine tool safety device using the same to recognize a 3D position of an RFID tag according to an embodiment of the present invention.

4 is a block diagram of a safety device of a machine tool using a position recognition system using RFID according to an embodiment of the present invention.

5 is a block diagram of a machine tool safety device using RFID according to an embodiment of the present invention.

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

210: transceiver

220: RFID tag

231, 232, 233, 234: receiver

240: communication unit

250: control unit

260: storage unit

270: error calculation unit

280: warning

Claims (20)

In the position recognition system using RFID, A transceiver for outputting a reference signal with an RFID tag; An RFID tag for outputting a tag signal reflecting the reference signal; A plurality of receivers for sensing the tag signal; And And a control unit for calculating three-dimensional position information of the RFID tag based on a tag signal detected by the plurality of receivers. The method of claim 1, And a communication unit for outputting the tag signal to the control unit. The method of claim 2, The communication unit is a location recognition device using RFID, characterized in that the communication device by wire or wireless. The method of claim 1, And a storage unit for storing the 3D position information calculated by the control unit. The method of claim 1, The RFID tag is a position recognition device using RFID, characterized in that detachable. The method of claim 1, The control unit obtains three-dimensional position information of the RFID tag based on a relationship between a time delay according to a time difference between arrival of the tag signal from the RFID tag to the plurality of receivers and the speed of the tag signal. A location recognition device using RFID. The method of claim 6, And a number of the plurality of receivers is at least four or more. The method of claim 1, And an error calculator configured to correct any one of an environment variable, a Doppler effect, an error caused by the receiver, and a combination thereof. In the safety device of a machine tool using a position recognition system using RFID, A transceiver for outputting a reference signal to the RFID tag; An RFID tag outputting a tag signal reflecting the reference signal and attached to the body; A plurality of receivers for sensing the tag signal; A controller configured to calculate 3D position information of the RFID tag based on a tag signal detected by the plurality of receivers; And And a warning unit configured to perform a warning operation in response to a control signal of the controller. The method of claim 9 Machine tool safety device using RFID further comprises a communication unit for outputting the tag signal to the control unit. The method of claim 10, The communication unit safety machine tool using RFID, characterized in that the communication device by wire or wireless. The method of claim 9, The machine tool safety device using RFID further comprises a storage unit for storing the three-dimensional position information calculated by the control unit. The method of claim 12, The storage unit stores the three-dimensional position information and safety / danger radius information of the machine tool, Safety / hazard radius information of the machine tool is set based on the three-dimensional position information machine tool safety apparatus using RFID. The method of claim 9, Machine body safety device using RFID, characterized in that the body is the machine tool. The method of claim 9, Machine body safety device using RFID, characterized in that the fuselage is user safety clothing. The method of claim 15, The user safety garment is a machine tool safety device using RFID, characterized in that any one of gloves, hats, clothing and combinations thereof. The method of claim 9, The control unit obtains three-dimensional position information of the RFID tag based on a relationship between a time delay resulting from a time difference between the tag signals arriving at the plurality of receivers from the RFID tag, respectively, and the speed of the tag signal. Machine tool safety using RFID. The method of claim 17, Machine tool safety device using RFID, characterized in that the number of the plurality of receivers is at least four. The method of claim 9, Machine tool safety device using RFID, characterized in that it further comprises an error calculation unit for correcting any one of environmental variables, Doppler effect, the error caused by the receiver and combinations thereof. The method of claim 9, The warning operation is a machine tool safety device using RFID, characterized in that any one of the warning sound output, warning lamp light emission and speed control operation.

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