KR102238908B1 - Transponder Interlock Switch - Google Patents

Abstract

The present invention relates to a door interlock switch that realizes double safety by using transponder technology and a microprocessor and, more specifically, to a door interlock switch which safely opens a door after an apparatus has stopped, and allows the apparatus to start only after the door is safely closed. According to an embodiment of the present invention, a door interlock switch that realizes double safety by using transponder technology and a microprocessor comprises: a body having an accommodating part formed therein to accommodate a solenoid, a sensor guide, and a PCB; the solenoid shape-matching a head coupled to an upper part of the body and controlling a lock state of an operating key; the sensor guide for checking the lock state through an optical sensor mounted on the PCB, and shape-matching a manual key inserted thereinto from the front to release the lock state by rotation of the manual key; the head coupled to the upper part of the body, and having an insertion hole formed to communicate in all directions so that the operating key can be inserted thereinto in all directions; the operating key capable of being inserted and removed from the insertion hole of the head, and having an RFID IC built therein; and the PCB on which an RFID reader that detects the operating key through RF communication with the RFID IC, and a microprocessor that determines whether an operation is performed by checking whether a configured security code is correct through data transmission and reception with the RFID IC, are mounted.

Description

Door interlock switch realizing double safety using transponder technology and microphone processor {Transponder Interlock Switch}

The present invention relates to a door interlock switch that implements double safety using a transponder technology and a microphone processor, and more particularly, a safety product required to implement a system that allows work to be performed only when the door is safely closed, that is, a door. It relates to an interlock switch.

If you open the door and enter the danger zone to work, if someone other than the worker does not know if there is anyone in the danger zone and closes the door and operates the machine, the worker is in danger.

Therefore, an interlock switch is attached to the door to protect the person working in the hazardous area by closing the door and preventing the machine from operating by anyone other than the operator.

For example, in the door 2 and the post 1 in the danger zone surrounding the driving range of a machine such as the work robot R shown in FIG. 1 with a fence, etc., in order to secure the safety of workers, etc. , An interlock switch 10 for stopping the machine by detecting the opening of the door 2 is attached and installed.

As shown in FIGS. 2A and 2B, a lockout device 140 is mounted on the interlock switch body 110, and in more detail, a base having a mounting hole 112a to be coupled to a mechanical post. A door switch 130 having an unlocking mechanism is fixed to 112 and a lockout device 140 is provided on the door switch 130.

Here, the lockout device 140 means preventing the safety device from being deliberately operated for some reason.

The lockout device 140 is surrounded by a hexahedral case 141 to protect the internal structure, and a key bundle 143 having a hole formed therein so that the locking key 142 can be inserted is formed on the front surface of the lockout device 140.

The head hole 131 of the door switch 130 is formed horizontally so that the operation (actuator) key 121 can be inserted in the lower side of the lockout device 140.

The door switch 130 is configured such that when the operation key 121 is inserted into the head hole 131, the connection contact is switched by moving the operation rod (not shown) of the switch unit in response thereto. A switch provided with a locking mechanism (not shown) that automatically and mechanically prevents the operation key 121 inserted into the hole 131 from being removed, and a contact when the operation key 121 is inserted into the head hole 131 It is a switch with a structure in which the movable contact of the block (not shown) is switched, and the circuit connection is switched to the main circuit side by such a switching operation, and the machine in the danger zone, for example, a working robot becomes operable and the locking mechanism is operated (Actuator) The key 121 is mechanically fixed so that the door does not open automatically.

On the other hand, when it is manipulated to cut off the power supply to the work robot, the solenoid (not shown) is excited by the operation-off signal, for example, to release the lock by the locking mechanism and open the door.

However, since such a conventional device does not have a separate recognition system for the actuator key, there is a risk that an operator who has a separate actuator key after the door is opened may arbitrarily control the door switch to drive the equipment.

In addition, conventionally, when the operation key is inserted, the internal rotary cam operates to control the contact point of the link contact portion, so that wear occurs due to the mechanical control operation, resulting in a problem that the contact point is inconsistent.

In addition, the conventional device has a problem in that it is not possible to automatically compensate the voltage to the solenoid in the photo interrupt when the solenoid attraction force is defective.

In addition, in the conventional apparatus, the actuator key, which is an operation key, can be inserted only in one direction of the headhole, so when changing the key insertion direction, the head must be disassembled and changed to a desired direction, and then the head must be assembled.

In addition, conventionally, since there is no emergency escape lever function, an emergency device switch must be separately installed inside the equipment to electrically release the lock of the interlock switch.

In addition, conventionally, only the lock release operation is displayed, and there is no way for the user to visually check the fault state of the interlock switch.

Registered Patent No. 10-1585038 (Registration date January 7, 2016)

The present invention was conceived to solve the above-described problem, and an object of the present invention is to check the security code of the operation key through communication between the operation key and the main body of the interlock switch using a transponder, so that another actuator key is inserted. If it is, it is to provide a door interlock switch that implements double safety using a non-working transponder technology and a microphone processor.

In addition, another object of the present invention is to provide a door interlock switch with a built-in control controller to enable semiconductor control, self-diagnosis for faults, and a door interlock switch that implements double safety using transponder technology and a microphone processor, which have an exceptionally long lifespan of the device. To provide.

In addition, another object of the present invention is to provide a door interlock switch implementing double safety using a transponder technology and a microphone processor capable of automatically compensating voltage to a solenoid in a photo interrupt when a solenoid suction force is defective.

Another object of the present invention is to provide a door interlock switch implementing double safety using a transponder technology and a microphone processor capable of inserting an actuator key in four directions without separating and assembling a head.

Another object of the present invention is to provide a door interlock switch implementing double safety using a transponder technology and a microphone processor capable of passively unlocking the interlock switch.

Another object of the present invention is to provide a door interlock switch implementing double safety using a transponder technology and a microphone processor in which a user can easily check a fault condition of an interlock switch with the naked eye.

The door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention for achieving the above object is a body in which a receiving part is formed to accommodate a solenoid, a sensor guide, and a PCB. ;

A solenoid that matches the head coupled to the upper portion of the main body and controls a locked state of an operation key;

A sensor guide for checking a lock state through an optical sensor mounted on the PCB, and releasing the lock state by rotation of the manual key by matching with a manual key inserted from the front;

A head coupled to an upper portion of the main body and having an insertion hole communicating in all directions so that an operation key can be inserted in all directions;

An operation key capable of being inserted and detached from the insertion hole of the head and having an RFID IC embedded therein;

A PCB mounted with an RFID reader that detects an operation key through an RF communication method with the RFID IC, and a microprocessor that determines whether an operation is performed by checking whether a security code set for data transmission and reception with the RFID IC is correct;

Consists of including.

In addition, the sensor guide is characterized in that the two optical sensors installed at different positions of the PCB are turned on/off opposite to each other, and the microprocessor determines the locked state and the unlocked state with an on/off signal.

In addition, it is coupled to the front surface of the main body, characterized in that the cover assembly is further provided with a lens consisting of a plurality of LEDs that light up according to the locked state and the unlocked state is further provided.

In addition, the two optical sensors and one RFID reader are connected to two microprocessors as input terminals by a redundant circuit, and the two microprocessors are each connected to one output terminal, and cross-monitoring between the two microprocessors is characterized. .

In addition, it is characterized in that the emergency escape lever is fitted to the sensor guide through the rear surface of the main body to release the lock state by a push/pull method.

In addition, the PCB supplies a DC voltage required for unlocking to the solenoid for a certain period of time, and when an unlock signal is detected through a photo interrupt after a certain period of time, a high-frequency on/off signal is used to prevent heat generation due to temperature rise. do.

According to the present invention having the above configuration, by using a transponder to check the security code of the operation key through communication between the main body of the operation key and the interlock switch, it prevents accidents by preventing the operation when another actuator key is inserted. You will be able to.

In addition, according to the present invention, since the control controller is built-in, semiconductor control is possible, self-diagnosis for failures is possible, and wear of the device is reduced, so that the lifespan is significantly longer.

In addition, according to the present invention, it is possible to automatically compensate the voltage to the solenoid in a photo interrupt when the solenoid attraction force is defective, and to prevent heat generation due to an increase in the solenoid temperature by using a high-frequency ON/OFF signal.

In addition, according to the present invention, it is possible to insert the actuator key in four directions without separating and assembling the head, thereby improving user convenience.

In addition, according to the present invention, the emergency escape lever is provided in the interlock switch, and by manually releasing the lock by pressing the emergency escape lever, it is possible to save parts and wiring work compared to when the conventional emergency stop switch is separately installed to release the lock electrically. have.

In addition, according to the present invention, various LED indicators are provided so that the user can easily check the fault condition of the interlock switch with the naked eye.

1 is a diagram for explaining an interlock switch.
2A and 2B are plan and side views illustrating a conventional interlock switch.
3 is a perspective view of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to the present invention.
4 is an exploded view of the head shown in FIG. 3.
5 is an exploded view of an operation key inserted into the head shown in FIG. 3.
6 is an exploded view of the cover assembly shown in FIG. 3.
7 is an exploded view of an emergency escape lever coupled to a door interlock switch implementing double safety using a transponder technology and a microphone processor shown in FIG. 3.
8 is a perspective view illustrating a combination of a door interlock switch implementing double safety using a transponder technology and a microphone processor shown in FIG. 3 and an emergency escape lever shown in FIG. 7.
9A to 9D are a normal cross-sectional view of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention and a perspective view of an emergency escape lever.
10A to 10C are cross-sectional views and perspective views of the emergency escape lever while pressing the emergency escape lever of the door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.
11A to 11D are cross-sectional views illustrating an operation state according to manual key operation of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.
12A and 12B are diagrams for explaining the determination of an unlocked state and a locked state of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.
13 is a block diagram of a redundancy system applied to a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.
14 is a view for explaining a tag recognition method of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings with respect to an embodiment of the present invention will be described the configuration and operation.

It should be noted that the same components among the drawings are denoted by the same reference numerals and reference numerals as much as possible even if they are indicated on different drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

3 is a perspective view of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to the present invention, FIG. 4 is an exploded view of the head shown in FIG. 3, and FIG. It is an exploded view of the inserted operation key, Figure 6 is an exploded view of the cover assembly shown in Figure 3, Figure 7 is coupled to the door interlock switch implementing double safety using the transponder technology and microphone processor shown in Figure 3 It is an exploded view of the emergency escape lever, and FIG. 8 is a perspective view of a combination of a door interlock switch implementing double safety using a transponder technology and a microphone processor shown in FIG. 3 and the emergency escape lever shown in FIG. 7.

3 to 8, the door interlock switch 100 implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention includes a main body 114, a head 115, and a solenoid. (120), sensor guide 121, 2PCB (117, 118), cable assembly 112, cover assembly 122, operation key 200, including the emergency escape lever 300.

The main body 114 is opened in front to form an accommodating portion 114a therein, and the solenoid 120, sensor guide 121, and PCBs 117 and 118 are accommodated in the accommodating portion 114a.

The solenoid 120 is fitted with the head pin 151 of the head 115 at the top to control the locked state of the operation key 200.

The sensor guide 121 checks the lock state through the optical sensor 124 mounted on the first PCB 117, and the manual key 168 provided in the cover assembly 122 inserted from the front and The lock is forcibly released by matching with the emergency escape lever 300 inserted from the rear.

Among the PCBs 117 and 118, the first PCB 117 is provided with an MCU redundancy circuit (see Fig. 13), an RFID reader IC 130 (see Fig. 14), and an optical sensor 124 for checking the state of the solenoid 120. do.

Here, as shown in FIG. 15, when power is supplied from the first PCB 117 to the solenoid 120, the operation is maintained at, for example, DC 24V required for unlocking, and after a certain period of time, for example, after 10 seconds, When an unlock signal is detected through an interrupt, a high frequency, for example, an on/off frequency of 22KHz is used to prevent heat generation due to an increase in the solenoid temperature.

Through this, when the solenoid suction force is defective, the voltage can be automatically compensated for the solenoid 120 in the photo interrupt.

The second PCB 118 is connected to the cable assembly 112 that is coupled from the bottom to the main body 114, and through the lens 163 of the cover assembly 112, double safety is achieved using the current transponder technology and a microphone processor. An LED circuit is provided so that the state of the implemented door interlock switch 100 can be visually confirmed.

The cover assembly 122 is coupled to the open front of the main body 114 to protect the solenoid 120, the sensor guide 121, and the PCBs 117 and 118 provided in the receiving portion 114a.

The cable assembly 112 is coupled to the lower surface of the main body 114 through a connector 113 and is connected to the second PCB 118 to supply power or transmit a signal.

The head 115 is coupled to the upper portion of the main body, and the insertion hole 115a is formed to communicate in all directions so that the operation key 200 can be inserted in all directions, and a head pin that implements a locking operation on the operation key 200 An RFID antenna (not shown) capable of checking insertion and removal of the current operation key 200 and 151 is provided, and is connected to the RFID reader 130.

In FIG. 3, reference numeral 111 denotes a PCB connector IP (Ingress Protection) protection cap.

As described above, since the present invention is made by electronic control rather than mechanical control, self-diagnosis for failure is possible, and there is no wear and the like, so the lifespan is remarkably high.

In FIG. 4, the head 115 includes a head pin 151, a rubber 152, a housing 153, a pin header 154, a lower case 155, an antenna wire sealing 156, a case sealing 157, It is configured to include an RFID PCB 158, a PCB main body 159, an upper case 160 and a header cap 161.

The head pin 151 connects the solenoid 120 and the head 115 to each other.

The rubber 152 serves as a spring (elastic) of the head pin 151 and a waterproof role.

The housing 153 is fitted on the upper body 114 and supports the head pin 151 not to be shaken when vertically elevating.

The pin header 154 is mated with the head pin 151 to move up and down together, and controls the locked state to the operation key 200.

The lower case 115 is a body cover for protecting an RFID PCB.

The antenna wire sealing 156 is a rubber sealing for the antenna coil PCB wire IP.

The case sealing 157 is a rubber sealing for protecting the antenna coil PCB.

The RFID PCB 158 is a PCB for an RFID antenna and is connected to the RFID reader 130.

The PCB main body 159 is a guide for fixing the RFID PCB 158.

The upper case 160 is a case for protecting the RFID PCB 158.

The header cap 161 is opened downward so that the case sealing 157, the RFID PCB 158, the PCB main body 159, and the upper case 160 are embedded, and the opened lower part is coupled to the lower case 155.

In addition, the upper portion of the header cap 161 is formed such that the insertion hole 115a communicates in all directions so that the operation key 200 can be inserted in all directions.

5, the operation key 200 includes an upper housing 201, an upper antenna cover 202, an RFID antenna 203, a lower antenna cover 204, a key body 205, and a lower housing ( 206).

The RFID antenna 203 has a closed curve shape having a predetermined thickness and is accommodated in the upper housing 201 while protected by the antenna upper cover 202 and the antenna lower cover 204 at the upper and lower portions, and the upper housing ( 201) is coupled to the lower housing 206 with the key body 205 therebetween.

6, the cover assembly 112 includes a lens cap 162, a lens 163, a lens sealing 164, a body cover sealing 165, a body cover 166, and a manual key sealing 167. ), and a manual key (168).

The lens cap 162 and the lens 163 are provided on the body cover 166 through a screw 161, and the lens is protected by a lens sealing.

The lens cap 162 prevents the spread of light emitted from the lens 163 and allows the lens 162 to be coupled to the body cover 166.

The lens 163 is made of a plurality of LEDs emitting light of different colors, and the user can visually check the state of the interlock switch 100 through the LED.

The LED of the lens 163 is specifically shown in a table as follows.

[Table 1]

In the above table, KEY is an operation key and SOL is a solenoid.

The body cover sealing 165 is a rubber seal for IP protection of the body 114 when the body cover 166 is coupled to the front surface of the open body 114.

When the manual key 168 is inserted through an insertion hole formed in the main body cover 166, the manual key 168 matches and rotates with the sensor guide 121 so that the locked state can be forcibly released.

The manual key sealing 167 is a rubber sealing for IP protection of the manual key 168.

Unexplained reference numeral 169 denotes a transparent cover or through hole for confirming the lens 162 from the outside.

As shown in Figs. 7 and 8, the emergency escape lever 300 includes a screw 301, a base 302, a stopper 303, a ball plunger 304, a control device 305, a screw 306, and a control. It is configured to include an old sealing 307, a cap 308, and a cap sealing 309.

The screw 301 couples the cap 308 and the base 302.

The base 302 is made of a disk shape and performs a function of a release button, and a stopper 303 having a different length depending on the thickness is coupled to the upper center of the center.

The lower portion of the control unit 305 is coupled to the upper portion of the stopper 303, and when the emergency escape lever 300 is pushed/pulled, it is fitted to the sensor guide 121 to control the lock and release of the lock, and the control unit sealing 307 ) Is extrapolated to prevent shaking when pushed/pulled.

The ball plunger 304 is coupled at the side of the control unit 305 so that the emergency escape lever 300 can operate smoothly using an internal spring tension.

The screw 306 couples the emergency escape lever 300 to the rear surface of the main body 114.

The cap 308 serves to guide when the control unit 305 is inserted and the control unit 305 moves forward and backward.

The cap sealing 309 is a rubber seal for protection of push button IP.

As described above, the emergency escape lever is provided in the interlock switch, and by manually releasing the lock by pressing the emergency escape lever, it is possible to save parts and wiring labor compared to when the conventional emergency stop switch is separately installed to release the lock electrically.

9A to 9D are a normal cross-sectional view of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention and a perspective view of an emergency escape lever, and FIGS. 10A to 10C are the present invention. A cross-sectional view and a perspective view of the emergency escape lever while pressing the emergency escape lever of the door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of FIG.

Normally before pressing the emergency escape lever 300 or when the emergency escape lever 300 is pulled, the control port 305 protrudes to the upper part of the cap 308 as shown in FIG. 9D, and then presses the emergency escape lever 300. As the control device 305 further rises upward in FIG. 9D as shown in 10c, the sensor guide 121 fitted to the control device 305 moves to the left when viewed in the drawing as shown in FIGS. 9B and 10B. Release the lock state.

Accordingly, the detection positions of the two optical sensors 124 mounted at different positions on the first PCB 117 are converted from FIGS. 9A to 10A to determine that the current lock is released, and constitute the lens 163. As the lock LED turns off among a number of LEDs, the unlock LED turns on to emit light.

11A to 11D are cross-sectional views illustrating an operation state according to manual key operation of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.

When the manual key 168 is rotated 180 degrees in the normal state as shown in FIG. 11B, the manual key 168 moves the sensor guide 121 to the left as shown in FIG. 11D to release the lock state.

Accordingly, the detection positions of the two optical sensors 124 mounted at different positions on the first PCB 117 are converted from FIGS. 11A to 11C to determine that the current lock is released, and constitute the lens 163. As the lock LED turns off among a number of LEDs, the unlock LED turns on to emit light.

12A and 12B are diagrams for explaining the determination of an unlocked state and a locked state of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.

In the unlocked state as shown in FIG. 12A, the sensor guide 121 turns off the first optical sensor 124a and turns on the second optical sensor 124b among optical sensors installed at different positions, and the MCU determines the signal and unlocks it. Determine the state.

On the contrary, in the locked state as shown in FIG. 12B, the sensor guide 121 turns on the first optical sensor 124a and turns off the second optical sensor 124b among optical sensors installed at different positions, and the MCU determines the signal at this time. To determine the lock status.

The MCU determines a failure when the two optical sensors 124a and 124b simultaneously maintain the ON state or the OFF state for a long time.

13 is a block diagram of a redundancy system applied to a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.

In Fig. 13, Y1 and Y2 are input elements and are connected to microprocessors (MCU1, MCU2) by redundancy.

Two optical sensors (124a, 124b) are installed in different positions, and are connected to the two microprocessors (MCU1, MCU2) in a redundant manner, and change information about the current lock state can be grasped by the position change of the detected optical sensor.

The RFID reader interlocks with the RFID antenna and transmits the tag information to the microprocessors (MCU1, MCU2).

The microprocessors (MCU1, MCU2) interlock with input/output through redundancy and determine each other's input/output status and fault status through cross monitoring.

X1 and X2 connected to the microprocessors (MCU1, MCU2), respectively, are output elements that determine the status of the current output signal, and are turned on when the conditions for the input from the microprocessors (MCU1, MCU2) are satisfied, and the input conditions are not satisfied It is turned off when a fault or fault is detected

Due to such a redundant configuration, operation is impossible even when an operation key is not inserted or an optical sensor is sensed when an unregistered operation key is used, and reliability can be secured through this.

14 is a view for explaining a tag recognition method of a door interlock switch implementing double safety using a transponder technology and a microphone processor according to an embodiment of the present invention.

A transponder 210 consisting of an RFID IC and an antenna 203 is embedded inside the operation key 200 that can be inserted into the head 115 of the interlock switch 100 from all directions, and the interlock switch 100 includes an RFID reader. A transponder reader 130 made of an RFID antenna and a built-in device.

In more detail, the RFID reader is provided in the first PCB 117 and the RFID antenna is provided in the head 115 to be connected to each other.

In such a configuration, when the operation key 200 is inserted into the head 115 and the transponder reader 130 detects the operation key 200, the transponder reader 130 transmits and receives data and determines whether the operation is performed by checking whether the set security code is correct. .

In this way, the transponder 210 (RFID tag) is embedded in the operation key 200 so that the interlock switch 100 does not operate even when the other operation key 200 is inserted.

In this way, the door interlock switch implementing double safety using the transponder technology and a plurality of microprocessors according to the present invention is installed on interlocking movable guards to prevent the start of operation until the door is closed. It is a device that always transmits a stop command when it is not closed.

First, when the door is opened and the interlock switch and the actuator are separated, the machine in operation stops and the machine is operated only when it is closed again.

Second, the interlock switch and actuator have a built-in transponder, so if an actuator that does not fit the purpose is inserted, the function does not operate.

Third, a lock function that allows the door to be opened only when the machinery in operation is safely stopped and prevents the door from being opened arbitrarily during operation,

Fourth, two microprocessors are built-in to stop or stop the machine in operation when a problem (breakdown, abnormality) occurs among the components that make up the door interlock switch, so it is possible to realize a high safety level (PLe & SIL3).

Fifth, the existing door interlock switch has a contact-type safety and auxiliary output, but this product controlled by two microprocesses has a double safety output and auxiliary output of a semiconductor device, followed by a fast response speed and a self-diagnosis function. It is equipped with a function that can display the status and send output with an LED on the front,

Sixth, a door interlock switch that can additionally be equipped with an internal release bar to prevent trapping inside when applied to a large machine that can be entered by an operator,

Seventh, the existing door interlock switch had to change the desired direction by loosening the head, but this product does not need to loosen the head to change the direction in which there is an inlet for inserting an actuator from four directions.

Although the technical idea of the present invention has been described above with reference to the accompanying drawings, this is illustrative of a preferred embodiment of the present invention and does not limit the present invention.

In addition, it is obvious that anyone of ordinary skill in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

100: door interlock switch 114: main body
115: head 117,118: PCB
120: solenoid 121: sensor guide
124: optical sensor 200: operation key
300: emergency escape lever

Claims (6)

In the door interlock switch with a locking function that allows the door to be opened only when the machinery in operation is safely stopped and prevents the door from being arbitrarily opened during the operation of the machinery:
The front is opened and the main body is formed with a receiving portion therein;
A cover assembly coupled to the open front of the main body to protect the receiving portion;
A head coupled to the upper portion of the main body and having an insertion hole communicating in all directions so that an operation key can be inserted in all directions, and having a head pin;
A solenoid accommodated in the receiving portion of the main body and connected to the head by the head pin;
A sensor guide accommodated in the receiving portion of the main body to release the locked state by control;
An operation key capable of being inserted and detached from the insertion hole of the head and having an RFID IC embedded therein;
An RFID reader accommodated in the receiving part of the main body and detects the operation key through an RF communication method with the RFID IC, and a microprocessor that checks whether the security code set for data transmission/reception with the RFID IC is correct to determine the operation or not. PCB made;
Door interlock switch implementing double safety using transponder technology and microphone processor including. The method of claim 1,
The sensor guide turns on/off two optical sensors installed at different positions of the PCB opposite to each other, and the microprocessor determines the lock state and the unlock state with an on/off signal. Door interlock switch that implements double safety using a microphone processor. The method of claim 1,
The cover assembly is a transponder technology and a microphone processor, characterized in that it further comprises a lens consisting of a plurality of LEDs that light up according to the lock state and the unlock state, and a manual key for forcibly releasing the lock state by rotation. Door interlock switch that implements double safety by using. The method of claim 2,
The two optical sensors and one RFID reader are connected to two microprocessors as input terminals by a redundant circuit, and the two microprocessors are connected to each output terminal, and the two microprocessors are cross-monitored with each other. Door interlock switch that realizes double safety using transponder technology and microphone processor. The method of claim 1,
It is coupled to the rear side of the main body, and is fitted with the sensor guide to implement double safety using a transponder technology and a microphone processor, characterized in that the emergency escape lever is further provided to release the lock state in a push/pull method. Door interlock switch. The method of claim 1,
The PCB supplies the solenoid with the DC voltage required for the unlock state for a certain period of time, and when the unlock signal is detected through a photo interrupt after a certain period of time, it is possible to prevent heat generation due to temperature rise by using a high-frequency ON/OFF signal. Door interlock switch that realizes double safety by using characteristic transponder technology and microphone processor.

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