CN220671853U - Polycrystalline silicon reduction furnace communication device and reduction furnace control system - Google Patents

Abstract

The utility model discloses a polycrystalline silicon reduction furnace communication device and a reduction furnace control system. The polysilicon reduction furnace communication device comprises a plurality of communication links. The number of the communication links is the same as that of the reduction furnaces, one end of each communication link is in communication connection with the DCS system, the other end of each communication link is in communication connection with one reduction furnace, and each communication link corresponds to one reduction furnace and is used for communicating the DCS system with each reduction furnace respectively. The communication link comprises a first communication card unit, a second communication card unit and an optical fiber unit, wherein the first communication card unit is positioned at the DCS system side and is in communication connection with the DCS system; the second communication card unit is positioned at the side of the reduction furnace and is in communication connection with the reduction furnace; the optical fiber unit is used for connecting the first communication card unit and the second communication card unit. The device has good signal transmission stability and anti-interference capability, and can improve the fault tolerance rate in the signal transmission process.

Description

Polycrystalline silicon reduction furnace communication device and reduction furnace control system

Technical Field

The utility model particularly relates to a polycrystalline silicon reduction furnace communication device and a reduction furnace control system.

Background

Currently, the communication protocol adopted by most DCS (Distributed Control System, i.e. distributed control system) in polysilicon factories and power cabinet PLCs of reduction furnaces is the industrial field bus technology (Profibus-DP) protocol. The Profibus card is configured through the DCS system to be used as a main body for data processing and interaction.

Under normal conditions, the distance between the DCS system controller and the power regulating cabinet of the reduction furnace is far, and data transmission is carried out with the power regulating cabinet PLC of the reduction site by taking a Profibus (industrial field bus) photoelectric conversion module, a communication optical fiber and a DP (digital versatile disc) communication line as media, so that the purposes of monitoring the voltage and the current of each phase of the reduction furnace and remotely controlling the current are realized.

Generally, the communication between the DCS system and the reducing furnace control cabinet is in a one-to-many communication mode, and one Profibus-DP card bears the program control and data transmission functions of a plurality of reducing furnaces. And each reduction furnace power regulating cabinet PLC is connected with a Profibus-DP card through an independent optical fiber link, the same number of Profibus optical fiber transceivers are respectively arranged on the system side and the reduction site, and the reduction furnace power regulating cabinets PLC are finally connected with the PLC on the site through Profibus-DP communication interfaces. As shown in FIG. 1, a Profibus-DP card with the number of DP-01 is connected with ICF-01-L-ICF-06-L through Profibus-DP cables, A01-A06 reduction furnace PLC is connected with ICF-01-R-ICF-06-R through Profibus-DP cables, and ICF-01-L-ICF-06-L optical fiber transceivers are connected with ICF-01-R-ICF-06-R through optical fiber links. Therefore, when any link (optical fiber, transceiver, DP head and communication line) in the network link is not contacted well, network fluctuation is generated, a single reduction furnace can be influenced, and zero-drop and frequent fluctuation phenomena of given current can be caused. When the Profibus-DP communication card fails, the phenomenon that the given current drops to zero and frequently fluctuates can occur in 6 reduction furnaces at the same time. The anti-interference capability of the electric wire is weaker, if the electric wire is in poor contact or electromagnetic interference and unreliable grounding, abnormal interruption of communication can be caused, network fluctuation is generated, the operation of the reduction furnace is influenced, and zero-falling and frequent fluctuation phenomena of given current can be caused.

In summary, the existing PROFIBUS field bus network has the defects of unstable communication, poor anti-interference capability and the like. Therefore, it is needed to provide a polysilicon reduction furnace communication device capable of meeting the communication stability requirement.

Disclosure of Invention

The utility model aims to solve the technical problems in the prior art, and provides a polysilicon reduction furnace communication device and a reduction furnace control system, wherein the polysilicon reduction furnace communication device has good signal transmission stability and anti-interference capability, and can improve the fault tolerance rate in the signal transmission process.

According to an embodiment of the first aspect of the present utility model, there is provided a communication device for a polycrystalline silicon reduction furnace, including: a plurality of communication links; the number of the communication links is the same as that of the reduction furnaces, one end of each communication link is in communication connection with the DCS system, the other end of each communication link is in communication connection with one reduction furnace, and each communication link corresponds to one reduction furnace and is used for communicating the DCS system with each reduction furnace respectively; the communication link comprises a first communication card unit, a second communication card unit and an optical fiber unit, wherein the first communication card unit is positioned at the DCS system side and is in communication connection with the DCS system; the second communication card unit is positioned at the side of the reduction furnace and is in communication connection with the reduction furnace; the optical fiber unit is used for connecting the first communication card unit and the second communication card unit.

Preferably, the optical fiber unit includes an optical fiber, a first transceiver, and a second transceiver; one end of the optical fiber is in communication connection with the first transceiver, and the other end of the optical fiber is in communication connection with the second transceiver; the first transceiver is positioned at the DCS side and is in communication connection with the first communication card unit, and is used for converting the photoelectric signals and sending the converted electric signals to the first communication card unit; the second transceiver is located at the reduction furnace side and is in communication connection with the second communication card unit, and is used for converting the photoelectric signals and sending the converted electric signals to the second communication card unit.

Preferably, the first transceiver is connected with the first communication card unit through more than five types of network cables; the second transceiver is also connected with the second communication card unit through more than five types of network cables.

Preferably, the first communication card unit is an IO module.

Preferably, the second communication card unit is a PROFINET communication module.

According to an embodiment of the second aspect of the present utility model, there is provided a reducing furnace control system, including a DCS system, a reducing furnace, and the above-mentioned polysilicon reducing furnace communication device. The number of the reduction furnaces is multiple, each reduction furnace is internally provided with a power regulating cabinet PLC, and the power regulating cabinets PLC are used for regulating the current in the reduction furnaces. The DCS system is respectively in communication connection with the power regulating cabinet PLC of a plurality of reduction furnaces through a communication link of the polycrystalline silicon reduction furnace communication device and is used for sending a current given value of the reduction furnaces to the power regulating cabinet PLC so that the power regulating cabinet PLC can control the current of the reduction furnaces according to the current given value.

Preferably, the control system of the reducing furnace further comprises a communication detection assembly, wherein the communication detection assembly is connected with a communication link of the communication device of the polycrystalline silicon reducing furnace and is used for judging whether the communication state of the communication link in the communication device of the polycrystalline silicon reducing furnace is normal or interrupted.

Preferably, the communication detection assembly comprises a counter, a reset priority trigger, a reset instruction unit and a state identification unit; the reset instruction unit is positioned at the DCS side and is electrically connected with the first communication card unit in the communication link and is used for continuously sending out a reset pulse signal through the communication link; the reset priority trigger is positioned at the reduction furnace side and connected with a second communication card unit in the communication link, and is used for receiving a reset pulse signal sent by the reset instruction unit; the reset priority trigger is also connected with the counter and is used for controlling the counter to count and zero when receiving the reset pulse signal; when the reset pulse signal is not received, sending a heartbeat counting signal to the counter every other preset time; the counter counts according to the received heartbeat counting signal; the state identification unit is electrically connected with the counter and is used for judging that the communication link is in a normal communication state when the count of the counter is smaller than a set count value and judging that the communication link is in a communication interruption state when the count of the counter is larger than or equal to the set count value.

Preferably, the reducing furnace control system further comprises a current stabilizing component, wherein the current stabilizing component is respectively and electrically connected with the state identification unit and the power regulating cabinet PLC, and is used for performing steady flow control on the power regulating cabinet PLC when the state identification unit judges that the communication link is in a state of communication interruption so as to keep the current in the reducing furnace stable.

Preferably, the current stabilizing component comprises a real-time current unit, an analog quantity selecting unit and a signal reading unit; the real-time current unit is electrically connected with the reduction furnace and is used for detecting a real-time current value in the reduction furnace; the analog quantity selection unit is respectively and electrically connected with the communication link and the real-time current unit and is used for acquiring a current given value detected by the DCS system and a real-time current value in the reduction furnace sent by the real-time current unit; the analog quantity selection unit is also electrically connected with the state identification unit and is used for setting the current given value as an effective current value when the state identification unit judges that the communication link is in a normal communication state; when the state identification unit judges that the communication link is in a communication disconnection state, current stabilization control is performed, namely, a real-time current value in the reduction furnace is set as an effective current value; the signal reading unit is electrically connected with the analog quantity selecting unit and is used for obtaining the effective current value obtained by the analog quantity selecting unit and sending the effective current value to the power regulating cabinet PLC so that the power regulating cabinet PLC can control the current of the reduction furnace according to the effective current value.

The polysilicon reduction furnace communication device is provided with a plurality of communication links, and the DCS system is respectively in communication connection with the reduction furnace through the plurality of communication links. Communication cards are arranged at two ends of each communication link. The communication card at one side of the DCS system is a VIM card, and the communication card at one side of the reduction furnace is a PROFINET communication card. Compared with the prior art, one communication card corresponds to the communication configuration of a plurality of reduction furnaces, and each VIM communication card in the communication device corresponds to one reduction furnace, so that the fault tolerance of the whole communication network can be improved, the operation load and the operation intensity of a single card are reduced, the frequency of network faults is reduced, and the stability of the system is improved. In addition, the VIM card and the PROFINET communication card are both communication cards driven by industrial Ethernet communication protocol programs, and have higher electromagnetic interference resistance and higher network rate. Therefore, the communication device has better signal transmission stability and anti-interference capability, can improve the fault tolerance rate of the signal transmission process, and has higher network rate.

Drawings

FIG. 1 is a schematic diagram of a prior art reducing furnace communication device.

FIG. 2 is a schematic diagram of a network architecture of a reducing furnace communication device according to some embodiments of the present utility model;

FIG. 3 is a schematic diagram of a network architecture of a reducing furnace control system in some embodiments of the utility model.

In the figure: 1-communication link, 11-first communication card unit, 12-second communication card unit, 13-first transceiver, 14-second transceiver, 2-communication detection component (heartbeat detection module), 3-current stabilization component (analog quantity tracking selection module), 4-signal reading unit (intermittent reading module).

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that, the terms "upper," "lower," and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience and simplicity of description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Example 1

Referring to fig. 2, the utility model discloses a polysilicon reduction furnace communication device, which comprises a plurality of communication links 1.

The number of the communication links 1 is the same as that of the reduction furnaces, one end of each communication link 1 is in communication connection with the DCS system, the other end of each communication link 1 is in communication connection with one reduction furnace, and each communication link 1 corresponds to one reduction furnace and is used for communicating with each reduction furnace respectively. The communication link 1 comprises a first communication card unit 11, a second communication card unit 12 and an optical fiber unit, wherein the first communication card unit 11 is positioned on the DCS system side and is in communication connection with the DCS system. The second communication card unit 12 is located on the reducing furnace side and is connected in communication with the reducing furnace. The optical fiber unit is used for connecting the first communication card unit 11 and the second communication card unit 12.

Before explaining the communication device in this embodiment, it should be noted that, in the prior art, as shown in fig. 1, the communication between the DCS system and the control cabinet of the reducing furnace is in a one-to-many communication mode, and one Profibus-DP card bears the program control and data transmission functions of multiple reducing furnaces. This communication mode has the following problems: when any link (optical fiber, transceiver, DP head, communication line) in the network link is not contacted well, network fluctuation is generated, a single reduction furnace can be influenced, and zero-drop and frequent fluctuation phenomena of given current can be caused. Particularly, when the Profibus-DP card fails, the phenomenon that given current drops to zero and frequently fluctuates can be caused for six reduction furnaces simultaneously. The anti-interference capability of the electric wire is weaker, if the electric wire is in poor contact or electromagnetic interference and unreliable grounding, abnormal interruption of communication can be caused, network fluctuation is generated, the operation of the reduction furnace is influenced, and zero-falling and frequent fluctuation phenomena of given current can be caused.

In the reducing furnace communication device in this embodiment, the DCS system is directly connected to the reducing furnaces by a plurality of communication links 1, i.e. in a many-to-many communication mode. The DCS system processes data for each reduction furnace and directly issues control instructions through the corresponding communication link 1. In this mode, the entire communication device is not disabled by the failure of one communication card.

Therefore, the polysilicon reduction furnace communication device has good signal transmission stability and anti-interference capability, and can improve the fault tolerance rate in the signal transmission process.

In the present embodiment, the optical fiber unit includes an optical fiber, a second transceiver 14, and a first transceiver 13. One end of the optical fiber is communicatively coupled to the first transceiver 13 and the other end is communicatively coupled to the second transceiver 14. The first transceiver 13 is located at the DCS system side and is communicatively connected to the first communication card unit 11, and is configured to convert an optical signal sent by the second transceiver 14 into an electrical signal, and send the converted electrical signal to the first communication card unit 11; and converting the electrical signal emitted from the first communication card unit 11 into an optical signal and transmitting the optical signal to the second transceiver. The second transceiver 14 is located at the reduction furnace side, and is in communication connection with the second communication card unit 12, and is used for converting the optical signal sent by the first transceiver 13 into an electrical signal, and sending the converted electrical signal to the second communication card unit 12; and, the electrical signal sent by the second communication card unit 12 is converted into an optical signal and sent to the first transceiver. Preferably, the first transceiver 13 is connected with the first communication card unit 11 through more than five types of network cables; the second transceiver 14 is also connected to the second communication card unit 12 by more than five types of network lines.

Specifically, the first transceiver 13 may be a commercially available Mosha IMC-21A fiber optic transceiver, i.e., the IMC-01-T to IMC-40-T module labeled in FIG. 2. The second transceiver 14 may also be a commercially available Mosha IMC-21A fiber optic transceiver, designated IMC-01-R-IMC-40-R module in FIG. 2. The number in the middle of the above two types of transceivers is the number of the corresponding reducing furnace, it is easy to understand that 40 does not represent the maximum number of communication routes, and if there are more reducing furnaces, the number can be increased continuously. The optical fiber transceiver at each reduction furnace side is connected to the DCS side optical transceiver in the DCS cabinet room through an independent optical fiber cable.

Further, the first communication card unit 11 is a virtual IO module. More specifically, the first communication card unit 11 may employ a commercially available Virtual IO Module virtual IO module (hereinafter referred to as VIM2 virtual IO module), where the VIM2 virtual IO module mainly provides an interface for an industrial ethernet I/O network and devices using ModbusTCP or an industrial ethernet communication protocol driver. The number of the VIM cards can be configured according to the number of the reduction furnaces, and each VIM card governs the optical fiber communication link 1 to realize the real-time communication of a single reduction furnace PLC through an industrial Ethernet bus (Profinet) communication protocol. The VIM2 virtual IO module (i.e. the first communication card unit 11) is connected to the network port of the first transceiver 13 through the over five network lines. The VIM2 virtual IO module is connected with the DCS controller through the communication bottom plate. IP addresses can be allocated to each reduction furnace power regulating cabinet PLC in the VIM communication card, the IP addresses of the plurality of power regulating cabinets PLC are in the same network segment and cannot be repeated, so that collision is avoided.

The second communication card unit 12 is a PROFINET communication module, and the PROFINET communication module may be a PROFINET communication card with a model CM1542-1. PROFINET is an industrial communication protocol based on ethernet, and in this embodiment, the physical interface used by PROFINET is a standard RJ-45 ethernet jack. The PROFINET communication module (i.e., the CM1542-1 module of fig. 2) is connected to the port of the moxas fiber optic transceiver (the second transceiver 14) through more than five types of network lines.

Further, each reduction furnace comprises a power regulating cabinet PLC, and the power regulating cabinet PLC can adopt Siemens 1500 series PLC. The power regulating cabinet PLC is connected with the PROFINET communication module through more than five types of network cables, so that the second communication card unit 12 (namely the PROFINET communication module) in the communication device is in communication connection with the reduction furnace side.

The VIM2 virtual IO module and the PROFINET communication module are both modules driven based on industrial Ethernet communication protocol programs. Therefore, it is easy to see that the reducing furnace communication device is a reducing furnace communication device based on the industrial Ethernet bus technology, namely, a closed loop network section is formed by optical fibers, PROFINET and VIM cards, so that communication connection between a PLC (i.e. a power regulating cabinet) on the reducing furnace side and a DCS system is realized. It should be noted that, the industrial ethernet is a network technology applied to the industrial automation field, which can adapt to higher environmental temperature and humidity, has higher anti-electromagnetic interference capability, and adapts to higher network rate.

According to the reducing furnace communication device, the communication configuration of the plurality of reducing furnaces corresponding to 1 PGM communication card in the prior art is adjusted to be that each VIM2 virtual IO module corresponds to 1 reducing furnace, so that the fault tolerance of the whole communication network is improved, meanwhile, the operation load and the operation intensity of a single card are reduced, the frequency of network faults is reduced, and the stability of the system is improved.

With continued reference to figure 2 of the drawings,

referring to fig. 2, a specific connection structure of the reducing furnace communication device will be described with reference to fig. 2 and specific options of each unit.

The polysilicon reduction furnace communication device based on the industrial Ethernet bus technology comprises Siemens 1500 series PLC (i.e. reduction furnace power regulating cabinet PLC) and PROFINET communication module CM1542-1, mosha IMC-21A optical fiber transceivers (i.e. IMC-01-T-IMC-40-T and IMC-01-R-IMC-40-R) and a corresponding number of VIM cards configured according to the number of reduction furnaces. Each VIM card hosts one optical fiber communication link 1. Each VIM card is independently connected with the power regulating cabinet PLC of a single reduction furnace through the optical fiber communication link 1 under the jurisdiction. In this embodiment, 40 VIM cards are configured according to the number of 40 reduction furnaces, and 1 mosha IMC-21A fiber transceiver, i.e., IMC-01-T in fig. 2, is configured for each VIM card in the DCS system. Meanwhile, 1 TCP/I optical fiber transceiver is configured in each reduction furnace power regulating cabinet PLC, namely IMC-01-R in FIG. 2. The IMC-01-T is connected with the Ethernet port of the VIM card industry by the more than five types of network wires; IMC-01-R is connected with the PLC communication module CM1542-1 of the power regulating cabinet of the reduction furnace through more than five types of network cables. The optical fiber transceiver IMC-01-T is connected with the IMC-01-R through a single-mode armored optical cable; similarly, the same arrangement as that of VIM-01 was used for each of VIM cards numbered VIM-02 to VIM-40. The VIM2 virtual IO module distributes IP addresses for each reduction furnace power regulating cabinet PLC, and the IP addresses of a plurality of PLCs are in the same network segment and cannot be repeated, so that collision is avoided. The DCS system can control a plurality of reduction furnaces through a plurality of communication links 1, respectively.

In summary, compared with the prior art that the Profibus communication card is utilized to communicate with the industrial field bus technology, in the embodiment, the Profibus-DP communication is changed to the real-time communication between the DCS system and the reduction furnace by utilizing the VIM card to communicate with the industrial ethernet bus technology (PROFINET), so that the signal transmission speed is improved, and the problems of small transmission bandwidth, long cycle period, low transmission efficiency, unstable communication, poor anti-interference capability and the like of the industrial field bus technology (Profibus-DP) in the prior art are avoided by using the super five types of network cables instead of the Profibus-DP communication cable.

Example 2

The utility model also discloses a reducing furnace control system which comprises a DCS system, the reducing furnace and the polycrystalline silicon reducing furnace communication device in the embodiment 1.

Wherein, the quantity of reducing furnace is a plurality of, all is equipped with the merit cabinet PLC in every reducing furnace, adjusts merit cabinet PLC and is used for adjusting the electric current in the reducing furnace. The DCS system is respectively in communication connection with the power regulating cabinets PLC of the multiple reduction furnaces through the communication link 1 of the polycrystalline silicon reduction furnace communication device and is used for sending the current given value of the reduction furnaces to the power regulating cabinets PLC so that the power regulating cabinets PLC can control the current of the reduction furnaces according to the current given value.

Specifically, the reducing furnace communication device in embodiment 1 realizes real-time communication with the reducing furnace by using the VIM card through an industrial ethernet bus technology (PROFINET), so that the signal transmission speed is improved, and the problems of small transmission bandwidth, long cycle period, low transmission efficiency, unstable communication, poor anti-interference capability and the like in the industrial field bus technology (Profibus-DP) in the prior art are avoided by using the super five types of network wires instead of the Profibus-DP communication cable.

The reducing furnace control system realizes communication between the DCS system and the power regulating cabinet PLC of the reducing furnace through the polycrystalline silicon reducing furnace communication device in the embodiment 1, so that real-time control of the reducing furnace can be realized, and the stability is higher.

Referring to fig. 3, in this embodiment, the reducing furnace control system further includes a communication detection assembly 2, where the communication detection assembly 2 (i.e. the heartbeat detection module in fig. 3) is connected to the communication link 1 of the polysilicon reducing furnace communication device, and is used for determining the detection and identification of the communication connection state between the DCS and the power regulator PLC. In other words, the communication detecting component 2 (i.e. the heartbeat detecting module) is configured to determine that the communication state of the communication link 1 in the communication device of the polysilicon reduction furnace is normal or interrupted.

Further, the communication detection component 2 comprises a counter, a heartbeat signal unit, a reset priority trigger, a reset instruction unit and a state identification unit.

The heartbeat signal unit is located at the reduction furnace side and is electrically connected with the second communication card unit 12 in the communication link 1, and is used for sending a counting start signal to the DCS system through the communication link 1 after the power regulating cabinet PLC starts to operate. The reset instruction unit is located at the DCS system side and is electrically connected to the first communication card unit 11 in the communication link 1. The reset instruction unit, after receiving the start count signal, continuously sends out a reset pulse signal through the communication link 1. The reset priority trigger is located at the reduction furnace side and connected with the second communication card unit 12 in the communication link 1, and is used for receiving the reset pulse signal sent by the reset instruction unit. The reset priority trigger is also connected with the counter and is used for controlling the counter to zero when receiving a reset pulse signal; and sending out a heartbeat counting signal to the counter every a preset period of time when the reset pulse signal is not received. The counter counts according to the received heartbeat counting signal. The state identification unit is electrically connected with the counter and is used for judging that the communication link 1 is in a normal communication state when the count of the counter is smaller than the set count value and judging that the communication link 1 is in a communication interruption state when the count of the counter is larger than or equal to the set count value. Preferably, the preset time is 1s and the count value is set to 3.

Illustratively, the priority reset flip-flop of FIG. 3 may employ existing flip-flops. After the power regulating cabinet PLC starts to operate, the PLC is connected with a counter to start counting. Meanwhile, the heartbeat signal unit sends an instruction starting signal to the reset instruction unit, and establishes a communication digital quantity output DO in the DCS through the reset instruction unit, and the digital quantity output DO continuously sends 0 and 1 reset pulse signals to the power regulating cabinet PLC through the VIM card. And after receiving the DCS reset pulse signal, the reset priority trigger in the power regulating cabinet PLC outputs 0, namely the reset signal. The turn-on counter stops counting according to the received reset signal, and resets and clears the turn-on counter. Otherwise, if the DCS reset pulse signal is not received, the reset priority trigger sends out a heartbeat counting signal to the counter every second, and the counter is connected to output a value of accumulated +1 every second according to the received heartbeat counting signal. When the on count value is greater than 3, the communication state identification module judges that the DCS is disconnected from the PLC of the power regulating cabinet.

In other words, the communication detection component 2 (heartbeat detection module) is configured to send a heartbeat counting start signal to the DCS via the industrial ethernet when the power regulator (PLC) of the reduction furnace is started, and count +1 times per second when the reset command is not received. The DCS system continuously sends a pulse reset instruction to a reducing furnace power regulating cabinet (PLC) through a VIM card according to the start counting signal, and the PLC is connected with a counter to automatically clear when receiving the reset signal. The communication state identification module judges that the heartbeat count is less than the set times, judges that the PLC and the DCS are in normal communication, and otherwise judges that the PLC and the DCS of the power regulating cabinet are in communication interruption.

In addition, as described above, the DCS system sends a current set value to the power cabinet PLC through the VIM card at the current moment, however, when the communication between the power cabinet PLC and the DCS system is disconnected, the current set value sent by the DCS system cannot reach the power cabinet PLC. At this time, the power regulating cabinet PLC cannot continuously control the current in the reduction furnace, which easily causes the current in the reduction furnace to fluctuate greatly and even fall to zero. Therefore, in this embodiment, the reducing furnace control system further includes a current stabilizing component 3 (i.e. the analog quantity tracking selection module in fig. 3). The current stabilizing component 3 is respectively and electrically connected with the state identification unit and the power regulating cabinet PLC, and is used for carrying out steady flow control on the power regulating cabinet when the state identification unit judges that the communication link 1 is in a state of communication interruption so as to keep the current in the reduction furnace stable and avoid zero current in the reduction furnace or large fluctuation.

Specifically, the current stabilizing assembly 3 includes a real-time current unit, an analog quantity selecting unit, and a signal reading unit 4 (i.e., an intermittent reading module in fig. 3). The real-time current unit is electrically connected with the reduction furnace and is used for detecting the real-time current value in the reduction furnace, wherein the real-time current value is the current feedback effective value of the PLC in the figure 3. The analog quantity selection unit is respectively and electrically connected with the communication link 1 and the real-time current unit and is used for obtaining a current given value sent by the DCS system and a real-time current value in the reduction furnace detected by the real-time current unit.

The analog quantity selection unit is also electrically connected with the state identification unit and is used for setting a current given value as an effective current value when the state identification unit judges that the communication link 1 is in a normal communication state; and when the state identification unit judges that the communication link 1 is in a communication disconnection state, performing steady flow control, and setting a real-time current value in the reduction furnace as an effective current value. The signal reading unit 4 (i.e. intermittent reading module) is electrically connected with the analog quantity selecting unit, and is used for obtaining the effective current value set by the analog quantity selecting unit, and sending the effective current value to the power regulating cabinet PLC, so that the power regulating cabinet PLC performs current control on the reduction furnace according to the effective current value.

In other words, the current stabilizing component 3 (i.e. the analog quantity tracking selection module) is configured to receive a current given value of the DCS, and when the DCS and the power regulating cabinet PLC communicate normally, determine that the current given value received currently is valid at the current time, and send the current to the intermittent signal reading module. When the communication between the DCS and the PLC of the power regulating cabinet is interrupted, the PLC takes the current-time-tracking effective current feedback value (namely the real-time current value in the reduction furnace) as the current-time effective current value and sends the current-time effective current value to the intermittent signal reading module. The intermittent signal reading module periodically reads a signal of an effective current value sent by the analog quantity selecting unit as the current setting of the reduction furnace, and the power regulating cabinet PLC controls the current in the reduction furnace according to the effective current value obtained by the intermittent signal reading module.

Referring to fig. 2 and 3, the reducing furnace control system in the present embodiment will be further described with reference to fig. 2 and 3.

Firstly, the DCS system is in communication connection with the power regulating cabinets PLC of the reduction furnaces through the communication device in the embodiment 1, the DCS system sends a current given value to the power regulating cabinets PLC, and in a normal state, the power regulating cabinets PLC control the current of the reduction furnaces according to the current given value. The heartbeat detection module is used for judging the communication connection state between the DCS and the power regulating cabinet PLC. After the power regulating cabinet PLC starts to operate, the PLC is connected with a counter to start counting. And a reset instruction unit at the DCS side establishes digital quantity output, and continuously sends 0 and 1 reset pulse signals to the power regulating cabinet PLC through the VIM card. After receiving the DCS reset pulse signal, the reset priority trigger on one side of the power regulating cabinet PLC controls the on counter to stop counting, and meanwhile resets and clears the on counter. Otherwise, if the DCS reset pulse signal is not received, the counter is turned on to output a cumulative value of +1 per second, and the communication state identification module judges that the DCS and the power regulating cabinet PLC are disconnected when the cumulative value of the counter is larger than 3. In addition, when the communication between the DCS system and the power regulating cabinet PLC is maintained, the analog quantity selection function module judges the received current given value sent by the DCS system as an effective current value at the current moment; when the communication between the DCS and the PLC of the power regulating cabinet is disconnected, the analog quantity selection functional module judges the real-time current value in the reduction furnace as the effective current value at the current moment. The signal reading unit 4 is used for obtaining the effective current value obtained by the analog quantity selection function module, and sending the effective current value to the power regulating cabinet PLC, so that the power regulating current in the reduction furnace can be prevented from falling to zero when the communication is interrupted, and the power regulating current of the reduction furnace can be prevented from fluctuating in a large range when the communication is poor.

In summary, the reducing furnace control system can realize current control in the reducing furnace, and has higher signal transmission speed and stronger anti-interference capability and stability in the communication process. In addition, the reducing furnace control system can also perform steady flow control on the reducing furnace when the communication between the DCS system and the power regulating cabinet PLC is disconnected, so that the current value in the reducing furnace is prevented from falling to zero or fluctuating in a large range.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.

Claims (10)

1. A polycrystalline silicon reduction furnace communication device, comprising: a plurality of communication links (1);

the number of the communication links (1) is the same as that of the reduction furnaces, one end of each communication link (1) is in communication connection with the DCS system, the other end of each communication link is in communication connection with one reduction furnace, and each communication link (1) corresponds to one reduction furnace and is used for communicating the DCS system with each reduction furnace respectively;

the communication link (1) comprises a first communication card unit (11), a second communication card unit (12) and an optical fiber unit, wherein the first communication card unit (11) is positioned at the DCS system side and is in communication connection with the DCS system; the second communication card unit (12) is positioned at the side of the reduction furnace and is in communication connection with the reduction furnace;

the optical fiber unit is used for connecting the first communication card unit (11) and the second communication card unit (12).

2. The polysilicon reduction furnace communication device according to claim 1, wherein the optical fiber unit comprises an optical fiber, a first transceiver (13) and a second transceiver (14);

one end of the optical fiber is in communication connection with the first transceiver (13), and the other end of the optical fiber is in communication connection with the second transceiver (14);

the first transceiver (13) is located at the DCS system side and is in communication connection with the first communication card unit (11) and is used for converting photoelectric signals and sending the converted electric signals to the first communication card unit (11);

the second transceiver (14) is located at the reduction furnace side and is in communication connection with the second communication card unit (12) and is used for converting photoelectric signals and sending the converted electric signals to the second communication card unit (12).

3. The polysilicon reduction furnace communication device according to claim 2, wherein the first transceiver (13) is connected to the first communication card unit (11) through more than five kinds of network wires; the second transceiver (14) is also connected with the second communication card unit (12) through more than five types of network cables.

4. The polysilicon reduction furnace communication device according to claim 1 or 2, wherein the first communication card unit (11) is an IO module.

5. The polysilicon reduction furnace communication device according to claim 1 or 2, wherein the second communication card unit (12) is a pro NET communication module.

6. A reducing furnace control system, which is characterized by comprising a DCS system, a reducing furnace and the polysilicon reducing furnace communication device of any one of claims 1-5;

the number of the reduction furnaces is multiple, and each reduction furnace is internally provided with a power regulating cabinet PLC which is used for regulating the current in the reduction furnace;

the DCS system is respectively in communication connection with the power regulating cabinets PLC of the multiple reduction furnaces through the communication link (1) of the polycrystalline silicon reduction furnace communication device, and is used for sending a current given value of the reduction furnaces to the power regulating cabinets PLC, so that the power regulating cabinets PLC control the current of the reduction furnaces according to the current given value.

7. The reducing furnace control system according to claim 6, further comprising a communication detection assembly (2), wherein the communication detection assembly (2) is connected with the communication link (1) of the polysilicon reducing furnace communication device, and is used for judging whether the communication state of the communication link (1) in the polysilicon reducing furnace communication device is normal or interrupted.

8. The reducing furnace control system according to claim 7, wherein the communication detecting assembly (2) includes a counter, a reset priority trigger, a reset instruction unit, and a state identification unit;

the reset instruction unit is positioned at the DCS system side and is electrically connected with the first communication card unit (11) in the communication link (1) and is used for continuously sending out a reset pulse signal through the communication link (1);

the reset priority trigger is positioned at the reduction furnace side and connected with a second communication card unit (12) in the communication link (1) and is used for receiving a reset pulse signal sent by the reset instruction unit;

the reset priority trigger is also connected with the counter and is used for controlling the counter to count and zero when receiving the reset pulse signal; when the reset pulse signal is not received, sending a heartbeat counting signal to the counter every other preset time;

the counter counts according to the received heartbeat counting signal;

the state identification unit is electrically connected with the counter and is used for judging that the communication link (1) is in a normal communication state when the count of the counter is smaller than a set count value and judging that the communication link (1) is in a communication interruption state when the count of the counter is larger than or equal to the set count value.

9. The reducing furnace control system according to claim 8, further comprising a current stabilizing assembly (3),

the current stabilizing component (3) is respectively and electrically connected with the state identification unit and the power regulating cabinet PLC, and is used for performing steady flow control on the power regulating cabinet PLC when the state identification unit judges that the communication link (1) is in a state of communication interruption so as to keep the current in the reduction furnace stable.

10. The reducing furnace control system according to claim 9, characterized in that the current stabilizing assembly (3) comprises a real-time current unit, an analog quantity selection unit and a signal reading unit (4);

the real-time current unit is electrically connected with the reduction furnace and is used for detecting a real-time current value in the reduction furnace;

the analog quantity selection unit is respectively and electrically connected with the communication link (1) and the real-time current unit and is used for acquiring a current given value sent by the DCS system and a real-time current value in the reduction furnace detected by the real-time current unit;

the analog quantity selection unit is also electrically connected with the state identification unit and is used for setting the current given value as an effective current value when the state identification unit judges that the communication link (1) is in a normal communication state; and when the state identification unit judges that the communication link (1) is in a communication disconnection state, performing steady flow control, namely setting a real-time current value in the reduction furnace as an effective current value;

the signal reading unit (4) is electrically connected with the analog quantity selecting unit and is used for obtaining the effective current value set by the analog quantity selecting unit and sending the effective current value to the power regulating cabinet PLC, so that the power regulating cabinet PLC can control the current of the reduction furnace according to the effective current value.