阅读说明：本技术 一种开关量输入型隔离式安全栅 (Switching value input type isolated safety barrier ) 是由 李威 周虎 梁祥东 于 2021-08-07 设计创作，主要内容包括：一种开关量输入型隔离式安全栅,包括电压比较器芯片,光电耦合芯片,继电器,输入端子,输出端子,通断信号指示灯,电源指示灯组成输入端防爆处理电路,所述输入端子输送信号到防爆处理电路,防爆处理电路输送信号给电压比较器芯片,电压比较器芯片控制光电耦合芯片,光电耦合芯片控制继电器导通,继电器的通断信号输送到输出端子,电压比较器芯片控制通断信号指示灯,电源指示灯受非本安端电源控制且常亮。本发明用在控制器和现场传感器之间进行开关量信号传输,限制传输线路上的能量,使之在安全可控的范围内,进行数据传输、自动控制和远程操作,能进行有效的信号隔离传输和防爆处理。(The utility model provides a switching value input type isolated safety barrier, includes voltage comparator chip, optoelectronic coupling chip, relay, input terminal, output terminal, break-make signal pilot lamp, power indicator lamp constitution input explosion-proof treatment circuit, input terminal carries signal to explosion-proof treatment circuit, and explosion-proof treatment circuit carries signal for voltage comparator chip, voltage comparator chip control optoelectronic coupling chip, and optoelectronic coupling chip control relay switches on, and the break-make signal of relay carries output terminal, voltage comparator chip control break-make signal pilot lamp, and power indicator lamp receives the control of this ampere of end power and normally lights. The invention is used for carrying out switching value signal transmission between the controller and the field sensor, limits the energy on a transmission line, carries out data transmission, automatic control and remote operation in a safe and controllable range, and can carry out effective signal isolation transmission and explosion-proof treatment.)

1. The utility model provides a switching value input type isolated safety barrier, including voltage comparator chip (U9A), photoelectric coupling chip (U6), relay (U5), input terminal (U1B), output terminal (U1D), on-off signal pilot lamp (D14), power indicator lamp (D17) constitute input explosion-proof treatment circuit, characterized in that, input terminal (U1B) signal transmission to voltage comparator chip (U9A), voltage comparator chip (U9A) control photoelectric coupling chip (U6), photoelectric coupling chip (U6) control relay (U5) switch on, the on-off signal of relay (U5) is carried output terminal (U1D), voltage comparator chip (U9A) control on-off signal pilot lamp (D14), power indicator lamp (D17) receive the control of unusual ampere power and light.

2. The isolated safety barrier according to claim 1, wherein the input terminal (U1B) has a pin 4 electrically connected to one end of a resistor R13 and one end of a resistor R17, the other end of the resistor R13 and the other end of the resistor R17 are electrically connected to the cathode of a Zener diode D3, the cathode of a Zener diode D4 and one end of a fuse F2, the other end of the fuse F2 is electrically connected to one end of a resistor R16, the other end of the resistor R16 is electrically connected to the Vi terminal of the power supply and one end of a capacitor C4, the pin 3 of the input terminal (U1B) is electrically connected to one end of a resistor R22, one end of the resistor R19, the positive end of the Zener diode D3 and the positive end of the Zener diode D4, the other end of the resistor R22 is electrically connected with the power supply negative electrode Gi end of the local safety end, the other end of the resistor R19 is electrically connected with one end of the capacitor C7, the other end of the capacitor C4 and the 3 rd pin of the voltage comparator chip (U9A), and the other end of the capacitor C7 is electrically connected with the power supply negative electrode Gi end of the local safety end.

3. The isolated barrier of claim 1, wherein the 8 th pin of the voltage comparator chip (U9A) is electrically connected to the Vi terminal of the power supply of the intrinsic safety terminal, the 4 th pin of the voltage comparator chip (U9A) is electrically connected to the Gi terminal of the negative electrode of the power supply of the intrinsic safety terminal, the 2 nd pin of the voltage comparator chip (U9A) is electrically connected to one terminal of the resistor R21 and one terminal of the resistor R24, the other terminal of the resistor R21 is electrically connected to the Vi terminal of the power supply of the intrinsic safety terminal, the other terminal of the resistor R24 is connected to the Gi terminal of the negative electrode of the power supply of the intrinsic safety terminal, one terminal of the capacitor C10 is electrically connected to the Vi terminal of the power supply of the intrinsic safety terminal, the other terminal of the capacitor C7 is electrically connected to the Gi terminal of the power supply of the intrinsic safety terminal, the 1 st pin of the voltage comparator chip (U9A) is electrically connected to one terminal of the Gi 40, one terminal of the resistor 18 and one terminal of the resistor R20, the other terminal of the triode R3 is electrically connected to the base of the emitter of the triode Q9, the negative electrode of the triode Q53984, the collector end of the triode Q9 is electrically connected with the cathode end of the on-off signal indicator lamp (D14), the anode end of the on-off signal indicator lamp (D14) is electrically connected with one end of a resistor R32, the other end of the resistor R32 is electrically connected with the positive Vi end of the intrinsic safety end power supply, the other end of the resistor R18 is electrically connected with the positive Vi end of the intrinsic safety end power supply, the other end of the resistor R20 is electrically connected with one end of a capacitor C8 and the base end of the triode Q4, the other end of the capacitor C8 is electrically connected with the negative Gi end of the intrinsic safety end power supply, the emitter end of the triode Q4 is electrically connected with the negative Gi end of the intrinsic safety end power supply, the collector end of the triode Q4 is electrically connected with the 2 nd pin of the photoelectric coupling chip (U6), the 1 st pin of the photoelectric coupling chip (U6) is electrically connected with one end of the resistor R14, and the other end of the resistor R14 is electrically connected with the positive Vi end of the intrinsic safety end power supply.

4. The isolated barrier of claim 1, wherein the 4 th pin of the photocoupler chip (U6) is electrically connected to one end of a resistor R15, the other end of the resistor R15 is electrically connected to the positive terminal Vo of the non-intrinsic-safety-end power supply, the 3 rd pin of the photocoupler chip (U6) is electrically connected to one end of a resistor R23, one end of a capacitor C9 and the base terminal of a transistor Q3, the other end of the resistor R23 is electrically connected to the negative terminal Go of the non-intrinsic-safety-end power supply, the other end of the capacitor C9 is electrically connected to the negative terminal Go of the non-intrinsic-safety-end power supply, the emitter terminal of the transistor Q3 is electrically connected to the negative terminal Go of the non-intrinsic-safety-end power supply, the collector terminal of the transistor Q3 is electrically connected to the positive terminal of the diode D8 and the 10 th pin of the relay (U5), the negative terminal of the diode D8 is electrically connected to the 1 st pin and the non-intrinsic-safety-end of the relay (U5), the 3 rd pin of the relay (U5) is electrically connected to the 8 th pin (U5) and the output terminal (U1) of the relay 5967, the 4 th pin of the relay (U5) is electrically connected with the 7 th pin of the relay (U5) and the 8 th pin of the output terminal (U1D), one end of a resistor R39 is electrically connected with the positive end Vo of a non-intrinsic safety end power supply, the other end of the resistor R39 is electrically connected with the positive end of a power supply state indicator lamp (D17), and the negative end of the power supply state indicator lamp (D17) is electrically connected with the negative end Go of the non-intrinsic safety end power supply.

Technical Field

The invention relates to a signal isolation safety device, in particular to a switching value input type isolation safety barrier which is used for carrying out switching value signal transmission between a controller and a field sensor, limiting the energy on a transmission line, carrying out data transmission, automatic control and remote operation in a safe and controllable range, and carrying out signal isolation transmission and explosion-proof treatment.

Background

With the continuous improvement of industrial automation degree, the application of automatic control is higher and higher, and in a control system, the input of switching value is very common, and a large amount of switching value signals exist no matter signals acquired on site or signals sent from a controller to the site. For example, in the coal, oil, gas, etc. industry, transmission of the switching signal must be intrinsically safe. The on-off operation directly on a line without explosion-proof treatment on site may cause a situation of ignition due to instantaneous excessive current, so that life and property safety cannot be guaranteed, which is not allowed in an explosive environment and needs to limit energy of a switching value device. Ordinary switching value input signals cannot be directly used in places with explosive dangers, such as coal, petrochemical industry, natural gas and the like, and when the switching value signals are switched on and off in the fields, the danger that lines are ignited to ignite explosive combustible materials exists.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a switching value input type isolated safety barrier which can transmit switching value signals between a controller and a field sensor, limit the energy on a transmission line, perform data transmission, automatic control and remote operation in a safe and controllable range, and perform signal isolated transmission and explosion-proof treatment.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a switching value input type isolated safety barrier, includes voltage comparator chip U9A, optoelectronic coupling chip U6, relay U5, input terminal U1B, output terminal U1D, on-off signal pilot lamp D14, power indicator lamp D17 constitute the explosion-proof processing circuit of input end, input terminal U1B transmitted signal is to voltage comparator chip U9A, and voltage comparator chip U9A controls optoelectronic coupling chip U6, and optoelectronic coupling chip U6 controls relay U5 and switches on, and output terminal U1D is carried to the on-off signal of relay U5, and voltage comparator chip U9A control signal pilot lamp D14, power indicator lamp D17 receive the control of non-intrinsic safety end power and normally light.

The invention has the advantages that the invention can realize the voltage-limiting and current-limiting energy control and the electrical isolation of the switching value control circuit when the on-site sensor uploads the switching state to the controller, thereby ensuring the reliability of the transmission line in the automatic control occasion with explosive factors, realizing the automatic control and the remote detection, and carrying out the signal isolation transmission and the explosion-proof treatment. The invention provides a switching value input type isolation circuit which is simultaneously subjected to explosion-proof treatment, limits the energy on a data line when a switching value signal is transmitted to a dangerous site, and ensures that the energy is not enough to ignite explosive mixtures, and simultaneously electrically isolates two devices, thereby enhancing the anti-interference performance of an industrial control network. The invention is used for a proximity switch sensor for detecting whether the material car is in place, and when the proximity switch sensor is connected with a non-explosion-proof PLC or other intelligent instrument controllers, reliable communication guarantee can be realized. The invention can enable the on-site switching value equipment to transmit a switching signal to the controller and simultaneously carry out explosion-proof treatment, the controller collects any switching value signal from the site, the energy on the circuit is not enough to ignite explosive mixtures, and simultaneously, the two equipment are electrically isolated, thereby enhancing the safety and reliability of industrial control.

Drawings

The structure and characteristics of a switching value input type isolated safety barrier of the present invention will be further described with reference to the accompanying drawings and embodiments, wherein:

fig. 1 is a circuit diagram of a first embodiment of the present invention.

Fig. 2 is a block diagram of a first embodiment of the present invention.

In the figure: the power supply comprises a U9A voltage comparator chip, an U6. photoelectric coupling chip, a U5. relay, a U1B input terminal, a U1D output terminal, a D14 on-off signal indicator lamp and a D17 power supply state indicator lamp.

Detailed Description

In the embodiment shown in fig. 1, a voltage comparator chip (U9A), a photoelectric coupling chip (U6), a relay (U5), an input terminal (U1B), an output terminal (U1D), an on-off signal indicator lamp (D14) and a power indicator lamp (D17) are provided.

The switching value input type isolated safety barrier comprises a voltage comparator chip (U9A), a photoelectric coupling chip (U6), a relay (U5), an input terminal (U1B), an output terminal (U1D), an on-off signal indicator lamp (D14) and a power indicator lamp (D17), wherein an input end explosion-proof processing circuit is formed by the power indicator lamp (D17), the input terminal (U1B) transmits signals to the voltage comparator chip (U9A), the voltage comparator chip (U9A) controls the photoelectric coupling chip (U6), the photoelectric coupling chip (U6) controls the relay (U5) to be conducted, the on-off signal of the relay (U5) is transmitted to the output terminal (U1D), the voltage comparator chip (U9A) controls the on-off signal indicator lamp (D14), and the power indicator lamp (D17) is controlled by an abnormal-safety end power source and is on.

According to the switching value input type isolated safety barrier, the 4 th pin of an input terminal (U1B) is electrically connected with one end of a resistor R13 and one end of a resistor R17, the other end of the resistor R13 and the other end of a resistor R17 are electrically connected with the negative electrode end of a Zener diode D3, the negative electrode end of the Zener diode D4 and one end of a fuse F2, the other end of the fuse F2 is electrically connected with one end of a resistor R16, the other end of the resistor R16 is electrically connected with the positive electrode Vi end of a local safety terminal power supply and one end of a capacitor C4, the 3 rd pin of the input terminal (U1B) is electrically connected with one end of a resistor R22, one end of a resistor R19 and the positive electrode end of the Zener diode D3 and the positive electrode end of the Zener diode D4, the other end of the resistor R22 is electrically connected with the negative electrode Gi end of the local safety terminal power supply, the other end of the resistor R19 is electrically connected with the 3 rd pin of a capacitor C4 and the negative electrode terminal Gi of a voltage comparator chip (U9).

In the switching value input type isolated safety grid, the 8 th pin of a voltage comparator chip (U9A) is electrically connected with the Vi end of a power supply of an intrinsic safety terminal, the 4 th pin of the voltage comparator chip (U9A) is electrically connected with the Gi end of the power supply of the intrinsic safety terminal, the 2 nd pin of the voltage comparator chip (U9A) is electrically connected with one end of a resistor R21 and one end of a resistor R24, the other end of the resistor R21 is electrically connected with the Vi end of the power supply of the intrinsic safety terminal, the other end of a resistor R24 is connected with the Gi end of the power supply of the intrinsic safety terminal, one end of a capacitor C10 is electrically connected with the Vi end of the power supply of the intrinsic safety terminal, the other end of the capacitor C10 is electrically connected with the Gi end of the power supply of the intrinsic safety terminal, the 1 st pin of the voltage comparator chip (U9A) is electrically connected with one end of the resistor R40, one end of a resistor 18 and one end of a resistor R20, the other end of the resistor R40 is electrically connected with the base electrode of a triode Q9, the emitter of a triode Q9 is electrically connected with the emitter, the lamp 9, the lamp is electrically connected with the signal D end of a triode 14, the positive terminal of the on-off signal indicator lamp (D14) is electrically connected with one end of a resistor R32, the other end of the resistor R32 is electrically connected with the positive Vi terminal of a local safety terminal power supply, the other end of the resistor R18 is electrically connected with the positive Vi terminal of the local safety terminal power supply, the other end of the resistor R20 is electrically connected with one end of a capacitor C8 and the base terminal of a triode Q4, the other end of the capacitor C8 is electrically connected with the negative Gi terminal of the local safety terminal power supply, the emitter terminal of the triode Q4 is electrically connected with the negative Gi terminal of the local safety terminal power supply, the collector terminal of the triode Q4 is electrically connected with the 2 nd pin of a photoelectric coupling chip (U6), the 1 st pin of the photoelectric coupling chip (U6) is electrically connected with one end of the resistor R14, and the other end of the resistor R14 is electrically connected with the positive Vi terminal of the local safety terminal power supply.

In the switching value input type isolated safety barrier, a 4 th pin of a photoelectric coupling chip (U6) is electrically connected with one end of a resistor R15, the other end of the resistor R15 is electrically connected with a positive Vo end of a non-intrinsic safety end power supply, a 3 rd pin of the photoelectric coupling chip (U6) is electrically connected with one end of a resistor R23, one end of a capacitor C9 and a base end of a triode Q3, the other end of the resistor R23 is electrically connected with a negative Go end of the non-intrinsic safety end power supply, the other end of the capacitor C9 is electrically connected with a negative Go end of the non-intrinsic safety end power supply, an emitter end of the triode Q3 is electrically connected with a negative Go end of the non-intrinsic safety end power supply, a collector end of a triode Q3 is electrically connected with a positive end of a diode D8 and a 10 th pin of a relay (U5), a negative pole end of a diode D8 is electrically connected with a 1 st pin and a non-intrinsic safety end pin Go of the relay (U5), a 3 rd pin of the relay (U5) is electrically connected with a 8 th pin of the relay (U5) and a U468 th pin (467) and a relay (464 th pin (468) terminal) of the relay (U468), one end of the resistor R39 is electrically connected with the positive terminal Vo of the non-intrinsic safety end power supply, the other end of the resistor R39 is electrically connected with the positive terminal of the power state indicator lamp (D17), and the negative terminal of the power state indicator lamp (D17) is electrically connected with the negative terminal Go of the non-intrinsic safety end power supply.

The invention provides an isolating circuit for acquiring switching value signals from the site by a controller, and simultaneously performs explosion-proof treatment to limit the energy on a data line when the switching value signals are uploaded to the controller from a dangerous site, so that the energy is not enough to ignite explosive mixtures, and simultaneously electrically isolates two devices, thereby enhancing the anti-interference performance of an industrial control network. The switching value signal of the field device can be safely transmitted to the controller, and the energy on any switching value signal line collected by the controller is insufficient to ignite explosive mixtures, such as: a proximity switch sensor for detecting whether the material car is in place is added to the circuit when the proximity switch sensor is connected with a non-explosion-proof PLC or other intelligent instrument controllers, and therefore reliable communication guarantee can be achieved.

The switching value input type isolated safety barrier can realize voltage limiting and current limiting energy control and electrical isolation of a switching value control circuit when a field sensor uploads a switching state to a controller, ensures the reliability of a transmission line in an automatic control occasion with explosive factors, realizes automatic control and remote detection, and can carry out signal isolation transmission and explosion-proof processing. The invention provides a switching value input type isolation circuit which is simultaneously subjected to explosion-proof treatment, limits the energy on a data line when a switching value signal is transmitted to a dangerous site, and ensures that the energy is not enough to ignite explosive mixtures, and simultaneously electrically isolates two devices, thereby enhancing the anti-interference performance of an industrial control network. The invention can enable the on-site switching value equipment to transmit a switching signal to the controller and simultaneously carry out explosion-proof treatment, the controller collects any switching value signal from the site, the energy on the circuit is not enough to ignite explosive mixtures, and simultaneously, the two equipment are electrically isolated, thereby enhancing the safety and reliability of industrial control.

The switch quantity input type isolated safety barrier can detect a switch quantity signal from a dangerous area, support the input of a dry contact and the input of a proximity switch, transmit the signal to the safe area through a relay, and reverse the logic state. The input, the output and the three ends of the power supply are isolated, the requirements of II C level intrinsic safety explosion prevention are met, the precision and the stability are high, and the response time is less than 20 ms. The switching value signals from the dangerous area are collected and subjected to intrinsic safety processing, so that the performance of resisting interference of industrial complex environment is achieved, and the reliability is improved. The production operation safety under the flammable and explosive environment is protected. The safety barrier and the dangerous area are separated, the energy on the transmission line is limited in a safe range, and the safety barrier is very convenient and practical.

The invention has good effect.