Electric actuating mechanism based on optical cable control

Abstract

The invention relates to an electric actuating mechanism based on optical cable control. The electric actuating mechanism comprises a controller, an optical module and an electric actuating mechanism body, the optical module communicates with the controller and the electric actuating mechanism body through optical cables; the optical module is divided into multiple paths, each path of optical module is provided with a plurality of wiring terminals with independent I / O (Input / Output) channels and characterization modules, each wiring terminal is provided with a channel characteristic module, and each I / O channel is used for selecting the characterization modules to process different types of signals according to actual requirements; the electric actuating mechanism body is internally provided with an I / O card communicating with the optical module. According to the invention, physical wiring of field instrument signals from a field junction box to an intermediate junction cabinet and then to an I / O card is canceled, one-time conversion is realized on terminals with electronic characteristics so as to reduce connection of a large number of corresponding cables, and limitation of signal types or control strategies is eliminated based on a mode of directly controlling a valve through an optical cable. Field wiring can be carried out at will, and the wiring cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric actuators, and particularly relates to an electric actuator based on optical cable control. Background Art

[0002] Since the 21st century, with the development of microelectronics and network communication technologies and the increasing complexity and large-scale petrochemical demands, DCS has received great attention and made great progress, and its application has become more and more extensive. Looking at the current application situation of DCS, the technologies in use mainly include conventional DCS (including wireless intelligent instruments), conventional DCS / FFCS (FF Control System), etc.

[0003] There are generally two ways to control a switch-type electric actuator using DCS, namely the bus system and the hard contact method, to achieve valve opening, closing, and adjustment. The bus system and the hard contact respectively use instrument cables of ZA-N-KYJVRP 2×1.5mm2 or ZA-N-KYJVRP 14×1.5mm2 for laying. With the rising price of copper in recent years, not only is the instrument cable expensive, but the laying labor cost and the path cost of laying wires are also high. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric actuator based on optical cable control, which uses an optical cable to replace physical wiring, cancels the physical wiring of the field instrument signal from the field junction box to the intermediate junction cabinet and then to the I / O card, and realizes a primary conversion on the electronically characterized terminal to reduce the connection of a large number of corresponding cables. The method of directly controlling the valve based on the optical cable gets rid of the limitations of signal types or control strategies, realizes arbitrary on-site wiring, and reduces the wiring cost.

[0005] The present invention provides an electric actuator based on optical cable control, including a controller, an optical module, and an electric actuator body;

[0006] The optical module communicates with the controller and the electric actuator body through an optical cable;

[0007] The optical module is multiplexed, and each optical module has a plurality of wiring terminals and characterized modules independent of I / O channels. Each wiring terminal is equipped with a channel characterization module, and each I / O channel is used to select a characterization module to process different types of signals according to actual needs;

[0008] An I / O card communicating with the optical module is provided inside the electric actuator body.

[0009] Further, the optical module uses an optical path bidirectional RS485 data optical terminal.

[0010] Further, the electric actuator body includes a valve.

[0011] Further, each optical module supports 8 electric actuator bodies, and there are 96 I / O channel-independent terminal blocks and characterization modules under each optical module.

[0012] Further, the electric actuator supports 48 optical modules.

[0013] Further, the I / O card adopts intelligent I / O in single-channel form, and each channel can be independently configured into any signal type, including AI HART / AO HART / DIDry / DI NAMUR / DO Wet / RTD / TC / Pulse.

[0014] Further, the I / O card has the function of identifying open or short circuits in on-site wiring and giving an alarm.

[0015] Further, the I / O card supports hot plugging and replacement.

[0016] Further, the controller is connected to the intelligent device management system. The intelligent device management system has a diagnostic function for the connected devices, an abnormal state alarm function for the set important data, the function of identifying short circuits and open circuits in signal lines and giving an alarm, and realizes automatic timing, regular, batch diagnosis and inspection and manual on-demand diagnosis and inspection.

[0017] Further, the optical module is installed in an explosion-proof optical cable switching terminal box.

[0018] With the above solution, through the electric actuator based on optical cable control, the electric actuator based on optical cable control uses an optical cable to be directly laid from the DCS cabinet to the site, replacing the traditional I / O card. The optical fiber communication method replaces the current signal transmission method, thus saving a large amount of cable laying costs and labor, and providing timely, accurate, comprehensive and reliable data for the enterprise, realizing the integration of safety, management and control in chemical storage areas, and improving the management level of petrochemical enterprises. The specific technical effects are as follows:

[0019] (1) By moving the I / O card into the valve cavity, the intermediate wiring cabinet for I / O signals is eliminated, which significantly reduces the comprehensive system cost and greatly reduces the requirement for the space of the on-site cabinet room.

[0020] (2) It can significantly save multi-core cables and cable trays from the on-site junction box to the on-site cabinet room (or control room), greatly reducing the project's instrument cable and material costs, construction volume and corresponding project costs. The reduction of cabinets and cable trays also saves the corresponding construction costs.

[0021] (3) The standardized junction box design can improve the supply speed, reduce the integration process, and accelerate the project progress. After each optical cable enters the explosion-proof optical terminal on-site, optical communication is carried out by the optical terminal and the valve, and multiple wiring teams can be arranged for construction simultaneously.

[0022] (4) Through this electric actuator, during loop commissioning, one team can complete the commissioning of about 50 valves in one day, reducing wiring errors and enabling quick problem handling.

[0023] (5) The single-channel I / O card has a low failure rate, a small impact area after failure, is easy to replace and configure for downloading, and has high reliability.

[0024] (6) Through this electric actuator, the DCS integration volume and integration time are reduced, shortening the project duration.

[0025] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it in accordance with the content of the specification, the following describes in detail with reference to the preferred embodiments of the present invention and the accompanying drawings. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the electric actuator based on optical cable control of the present invention. Detailed Embodiment

[0027] The following further describes in detail the specific embodiments of the present invention with reference to the drawings and embodiments. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0028] Refer Figure 1 As shown, this embodiment provides an electric actuator based on optical cable control, including a controller 10, an optical module 20, and an electric actuator body 30 in the machine room; the optical module 20 communicates with the controller 10 and the electric actuator body 30 through an optical cable; the optical module 20 is multiplexed, and each optical module 20 has multiple wiring terminals and characterization modules with independent I / O channels. Each wiring terminal is equipped with a channel characterization module to unbind the channel characteristics and the card characteristics to achieve a more flexible system configuration; each I / O channel is used to select a characterization module to process different types of signals according to actual needs; an I / O card communicating with the optical module 20 is provided in the electric actuator body 30. Field wiring of any signal type can use its corresponding characterization module and be connected to the wiring terminal at any position. The digital communication bus is laid along the bottom plate to send the device signal information to the redundant machine room to complete signal transmission.

[0029] In this embodiment, the optical module 20 uses an optical path bidirectional RS485 data optical terminal.

[0030] In this embodiment, the electric actuator body 30 includes a valve.

[0031] In this embodiment, each optical module 20 supports 8 electric actuator bodies 30, and there are 96 wiring terminals and characterization modules with independent I / O channels under each optical module 20.

[0032] In this embodiment, the electric actuator supports 48 of the optical modules 20.

[0033] In this embodiment, the I / O card uses intelligent I / O in a single-channel form, and each channel can be independently configured into any signal type, including AI HART / AO HART / DIDry / DI NAMUR / DO Wet / RTD / TC / Pulse. The single-channel intelligent IO card must support HART 7. All IO cards can be automatically recognized by the DCS software without additional manual hardware configuration.

[0034] In this embodiment, the I / O card has the function of identifying open or short circuits in the on-site wiring and giving an alarm. The output signal should be able to remain unchanged or reach a pre-set safe output value in case of equipment failure. The I / O card for thermocouple temperature detection has the function of cold-junction temperature compensation.

[0035] In this embodiment, the I / O card supports hot plugging and replacement.

[0036] In this embodiment, the controller is connected to the intelligent device management system. The intelligent device management system has a diagnostic function for the connected devices, an abnormal state alarm function for the set important data, a function of identifying short circuits and open circuits in the signal lines and giving an alarm, and realizes automatic timed, regular, batch diagnostic inspections and on-demand diagnostic inspections by personnel.

[0037] In this embodiment, the optical module 20 is installed in an explosion-proof optical cable exchange junction box. A field junction box is adopted, and a network optical terminal switch and a power supply are equipped inside the box. The power supply equipment is 24VDC with 1:1 redundant configuration, installed in each junction box, and the power load is not greater than 50%, but the minimum capacity shall not be less than 2A.

[0038] In this embodiment, the controller has fast control ability, and the cumulative time from I / O input through PID control operation to AO output should be within 0.5 seconds.

[0039] The present invention can realize the control of all electric valves in the DCS system, display the information detected by the oil tank level gauge, thermometer, and pressure transmitter, the status of the valves in the central control room, and has an alarm prompt function. It can realize the remote opening, closing, and stopping functions of the valves through optical cable communication.

[0040] The electric actuator based on optical cable control of the present invention lays optical cables directly from the DCS cabinet to the site, replacing traditional I / O cards, and replaces the current signal transmission method with optical fiber communication, thus saving a large amount of cable laying costs and labor, and providing enterprises with timely, accurate, comprehensive and reliable data, realizing the integration of safety, management and control in chemical storage areas, and improving the management level of petrochemical enterprises. The specific technical effects are as follows:

[0041] (1) By moving the IO card into the valve cavity, the intermediate wiring cabinet for I / O signals is eliminated, which greatly reduces the comprehensive system cost and significantly reduces the requirement for the space of the on-site cabinet room.

[0042] (2) It can greatly save multi-core cables and cable trays from the on-site junction box to the on-site cabinet room (or control room), significantly reducing the cost of project instrument cables, materials, construction volume and corresponding project costs. The reduction of cabinets and cable troughs also saves the corresponding construction costs.

[0043] (3) Through the standardized junction box design, the supply speed can be increased, the integration links can be reduced, and the project progress can be accelerated. After each optical cable enters the explosion-proof optical terminal unit on-site, optical communication is carried out between the optical terminal unit and the valve, and multiple wiring teams can be arranged for construction at the same time.

[0044] (4) Through this electric actuator, during loop commissioning, a team can complete the commissioning of about 50 valves in 1 day, with fewer wiring errors and problems being quickly handled.

[0045] (5) Using a single-channel I / O card, it has a low failure rate, a small impact area after failure, is easy to replace and configure for downloading, and has high reliability.

[0046] (6) Through this electric actuator, the DCS integration volume and integration time are reduced, shortening the project duration.

[0047] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electric actuator based on optical cable control, characterized in that: It comprises a controller (10), an optical module (20) and an electric actuator body (30); The optical module (20) communicates with the controller (10) and the electric actuator body (30) via an optical cable; The optical module (20) is multi-channel, and each optical module (20) has a plurality of independent I / O channel connection terminals and characterization modules, each connection terminal is equipped with a channel characterization module, and each I / O channel is used to select a characterization module to process different types of signals according to actual needs; An I / O card for communicating with the optical module (20) is arranged inside the electric actuator body (30).

2. The electric actuator based on optical cable control according to claim 1, characterized in that: The optical module (20) adopts an optical bidirectional RS485 data optical terminal.

3. The electric actuator based on optical cable control according to claim 1, characterized in that: The electric actuator body (30) comprises a valve.

4. The electric actuator based on optical cable control according to claim 1, characterized in that: Each optical module (20) supports eight electric actuator bodies (30), and each optical module (20) has 96 I / O channel independent wiring terminals and a characterization module.

5. The electric actuator based on optical cable control according to claim 4, characterized in that: The electric actuator supports 48 optical modules (20).

6. The electric actuator based on optical cable control according to claim 1, characterized in that: The I / O card adopts intelligent I / O, single channel form, each channel is independently configured to any signal type, including AI HART / AO HART / DIDry / DI NAMUR / DO Wet / RTD / TC / Pulse.

7. The electric actuator based on optical cable control according to claim 6, characterized in that: The I / O card has the function of identifying a disconnection or short circuit in the on-site wiring and issuing an alarm.

8. The electric actuator based on optical cable control according to claim 7, characterized in that: The I / O card supports hot plugging and replacement.

9. The electric actuator based on optical cable control according to claim 1, characterized in that: The controller is connected to an intelligent device management system, which has a diagnostic function for the connected equipment, an abnormal state alarm function for the set important data, a function for identifying short circuits and open circuits of signal lines, and an alarm function, and realizes automatic timing, periodic, and batch diagnostic inspections and manual diagnostic inspections at any time.

10. The electric actuator based on optical cable control according to claim 1, characterized in that: The optical module is installed in an explosion-proof optical cable exchange junction box.

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