CN219435249U - Three-channel electrohydraulic servo controller applied to TRT - Google Patents
Three-channel electrohydraulic servo controller applied to TRT Download PDFInfo
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- CN219435249U CN219435249U CN202122960379.9U CN202122960379U CN219435249U CN 219435249 U CN219435249 U CN 219435249U CN 202122960379 U CN202122960379 U CN 202122960379U CN 219435249 U CN219435249 U CN 219435249U
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Abstract
The application provides a three-channel electrohydraulic servo controller applied to TRT. The three-channel electrohydraulic servo controller applied to TRT comprises: a chassis; three independent control channels installed inside the case; wherein each control channel comprises: the device comprises a signal control board, a digital display board and an adapter board; the signal control board and the digital display board are inserted and plugged through the European style of the interface board and are connected with external equipment through a connector; the signal control board is in communication connection with the digital display board through the adapter plate; a signal control board, comprising: a signal change-over switch; the signal change-over switch is shifted to enable the corresponding control channel to be switched between a local signal mode and a remote signal mode. The three independent control channels can control the opening of the turbine stationary blade and the opening of the bypass valve at the same time, corresponding servo controllers are not required to be arranged for control, and the space and the cost are saved.
Description
Technical Field
The application relates to electrohydraulic servo control technology, in particular to a three-channel electrohydraulic servo controller applied to TRT.
Background
The stability of the top pressure of the blast furnace in a steel mill is very important for blast furnace smelting, and whether the TRT (also called a blast furnace residual gas power generation device) can stably operate is a key for ensuring that the top pressure of the top is stable within a certain pressure range, so that the control of the stability of the top pressure of the blast furnace is an important index for measuring the technical level of the TRT. Currently known TRT devices mostly adopt an electrohydraulic servo control system for controlling the opening degree of a stator blade and the opening degree of a bypass of a turbine to realize effective control of the pressure at the top of the furnace, and the servo controller is the core of monitoring and controlling the electrohydraulic servo system.
The electrohydraulic servo controller in the prior art has single function, is mostly a servo controller developed by using a PLC and a PID control module, and has the defects of low PLC response (the CPU is 12 bits, AD and DA conversion are needed) control precision and the like, and meanwhile, the controller can not accurately display related control parameters. The requirement of simultaneously controlling the opening of the static blade and the bypass valve of the TRT turbine cannot be met, if the actual requirement of the on-site TRT is met, a plurality of devices with different functions are required to be selected, so that the cost is high, the actual installation space is larger, and the difficulty is increased for on-site maintenance.
Disclosure of Invention
In view of this, the present application proposes a three-channel electro-hydraulic servo controller applied to TRT.
The embodiment of the application provides a three-channel electrohydraulic servo controller applied to TRT, which comprises: a chassis;
three independent control channels installed inside the case; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board;
the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector;
the signal control board is in communication connection with the digital display board through the adapter plate;
the signal control board comprises: a signal change-over switch;
and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode.
In some embodiments, further comprising: isolating the power supply; the isolated power supply supplies power to the signal control board and the digital display board through the adapter board.
In some embodiments, further comprising: a first protection circuit connected to the isolated power supply;
the first protection circuit includes: the DC-DC power chip, the fuse, the first diode, the second diode, the first capacitor, the second capacitor, the third capacitor and the fourth capacitor;
the first capacitor is connected in parallel with the second capacitor, the third capacitor, the fourth capacitor and the second diode, the second capacitor is connected in series with the third capacitor, and the fuse is connected in series with the first diode and the DC-DC power chip; the DC-DC power supply chip is connected with a +24V direct current power supply and outputs +/-15V direct current voltage; the first capacitor, the second capacitor and the third capacitor form a pi-type protection structure for inhibiting surge voltage in the first protection circuit.
In some embodiments, the fuse is a PTC self-healing fuse.
In some embodiments, the fourth capacitance is a tantalum capacitance.
In some embodiments, further comprising: a step-down circuit connected to the first protection circuit;
the step-down circuit includes: the first voltage stabilizing regulator chip, the first adjustable resistor and the third diode;
the input pin of the first voltage-stabilizing regulator chip is connected with +15V power supply voltage output by the first protection, the adjustable voltage pin of the first voltage-stabilizing regulator chip is connected with the first matching resistor in series, and the output pin of the first voltage-stabilizing regulator chip is connected with the third diode in parallel and outputs +10V power supply voltage.
In some embodiments, further comprising: a booster circuit connected to the first protection circuit;
the booster circuit includes: the second voltage stabilizing regulator chip, the second matching resistor and the fourth diode;
the input pin of the second voltage-stabilizing regulator chip is connected with the-15V power supply voltage output by the first protection, the adjustable voltage pin of the second voltage-stabilizing regulator chip is connected with the second matching resistor in series, and the output pin of the second voltage-stabilizing regulator chip is connected with the fourth diode in parallel and outputs the-10V power supply voltage.
In some embodiments, further comprising: the second protection circuit is arranged on the signal control board;
the second protection circuit includes: the device comprises a discharge tube, a first bipolar transient diode, a second bipolar transient diode, a first protection resistor, a second protection resistor and an operational amplifier;
the discharge tube is connected into a first differential control signal and a second differential control signal which are input by the signal control board, the discharge tube is respectively connected with the first bipolar transient diode and the second bipolar transient diode in parallel, one end of the discharge tube, which is connected into the first differential control signal, is connected with the first protection resistor and the operational amplifier in series, and one end of the discharge tube, which is connected into the second differential control signal, is connected with the second protection resistor and the operational amplifier in series.
In some embodiments, the signal switch is switched to the remote signal mode and the signal control board accesses remote instructions issued by the distributed control system.
In some embodiments, the signal control board is configured to automatically switch to the local signal mode in response to detecting the disappearance of the remote instruction.
The three-channel electrohydraulic servo controller applied to TRT provided by the embodiment of the application comprises: a chassis; three independent control channels installed inside the case; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board; the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector; the signal control board is in communication connection with the digital display board through the adapter plate; the signal control board comprises: a signal change-over switch; and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode. The three independent control channels can meet the control requirements of the static blade and bypass of the TRT turbine at the same time, can save the occupation of site use space, enable the three-channel electrohydraulic servo controller to respond faster by independently developing the related PID operation analog circuit, have higher control precision, and can display some functional parameters and working states in PID operation through the digital display board for indicating the working state of the TRT system. The three independent control channels can control the opening of the turbine stationary blade and the opening of the bypass valve at the same time, corresponding servo controllers are not required to be configured for control, and the space and the cost are saved.
Drawings
In order to more clearly illustrate the technical solutions of the present application or the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the prior art descriptions, it being obvious that the drawings in the following description are only the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a three-channel electrohydraulic servo controller applied to TRT according to an embodiment of the present application.
Fig. 2 shows a schematic diagram of the functional connections of a three-channel electro-hydraulic servo controller applied to a TRT according to an embodiment of the present application.
Fig. 3 shows a schematic diagram of the working principle of a three-way electro-hydraulic servo controller according to an embodiment of the present application.
Fig. 4 shows a circuit schematic of a first protection circuit according to an embodiment of the present application.
Fig. 5 shows a circuit schematic of a step-down circuit according to an embodiment of the present application.
Fig. 6 shows a circuit schematic of a boost circuit according to an embodiment of the present application.
Fig. 7 shows a circuit schematic of a second protection circuit according to an embodiment of the present application.
Fig. 8 shows a circuit schematic of an antistatic protection module according to an embodiment of the present application.
Fig. 9 shows a schematic structural view of a front panel of any one of the signal control boards according to the embodiment of the present application.
Reference numerals illustrate:
the system comprises a 1-case, a 2-first control channel, a 3-second control channel, a 4-third control channel, a 201-first signal control board, a 202-first digital display board, a 203-first connecting board, a 204-first liquid crystal display screen, a 301-second signal control board, a 302-second digital display board, a 303-second connecting board, a 304-second liquid crystal display screen, a 401-third signal control board, a 402-third digital display board, a 403-third connecting board, a 404-third liquid crystal display screen, a 2011-first control front panel, a 20111-signal switch, a 20112-local knob, a 20113-instruction loss indicator, a 20114-displacement transmitter zero adjustment knob, a 20115-displacement transmitter full-stroke adjustment knob, a 20116-displacement signal output zero adjustment knob, a 20117-displacement signal output full-stroke adjustment knob, a 20118-gain adjustment knob and a 20119-zero adjustment knob.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As described in the background section, the stability of the top pressure of the blast furnace in the steel mill is important for blast furnace smelting, and whether the TRT (also referred to as a blast furnace residual gas power generation device) can stably operate is a key for ensuring that the top pressure of the top is stable within a certain pressure range, so that controlling the stability of the top pressure of the blast furnace is an important index for measuring the technical level of the TRT. Currently known TRT devices mostly adopt an electrohydraulic servo control system for controlling the opening degree of a stator blade and the opening degree of a bypass of a turbine to realize effective control of the pressure at the top of the furnace, and the servo controller is the core of monitoring and controlling the electrohydraulic servo system.
The existing devices have single functions, are mostly servo controllers developed by using PLC and PID control modules, and have the defects of slow response of the PLC (the CPU is 12 bits, AD and DA conversion are needed) and low control precision, and meanwhile, the controllers can not accurately display related control parameters. The requirement of simultaneously controlling the opening of the static blade and the bypass valve of the TRT turbine cannot be met, if the actual requirement of the on-site TRT is met, a plurality of devices with different functions are required to be selected, so that the cost is high, the actual installation space is larger, and the difficulty is increased for on-site maintenance.
The problems of low response speed, no function parameter and working state display function, high cost and high installation difficulty exist in the related technology, and a servo controller is required to be connected for the turbine stationary blade and the bypass valve respectively.
As such, embodiments of the present application provide a three-channel electro-hydraulic servo controller for a TRT, comprising: a chassis; three independent control channels arranged in the case through mounting guide rails; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board; the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector; the signal control board is in communication connection with the digital display board through the adapter plate; the signal control board comprises: a signal change-over switch; and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode.
The three-channel electrohydraulic servo controller applied to TRT provided by the embodiment of the application comprises: a chassis; three independent control channels installed inside the case; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board; the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector; the signal control board is in communication connection with the digital display board through the adapter plate; the signal control board comprises: a signal change-over switch; and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode. The three independent control channels can meet the control requirements of the static blade and bypass of the TRT turbine at the same time, can save the occupation of site use space, enable the three-channel electrohydraulic servo controller to respond faster by independently developing the related PID operation analog circuit, have higher control precision, and can display some functional parameters and working states in PID operation through the digital display board for indicating the working state of the TRT system of staff. The three independent control channels can control the opening of the turbine stationary blade and the opening of the bypass valve at the same time, corresponding servo controllers are not required to be arranged for control, and the space and the cost are saved.
The three-way electro-hydraulic servo controller applied to the TRT provided in the embodiments of the present application will be specifically described by way of specific examples.
Fig. 1 shows an exemplary structural schematic diagram of a three-way electro-hydraulic servo controller applied to a TRT according to an embodiment of the present application.
Referring to fig. 1, a three-channel electro-hydraulic servo controller applied to a TRT according to an embodiment of the present application includes: a cabinet 1, and three independent control channels 2-4 mounted inside the cabinet 1 by mounting rails. The first control channel 2 comprises a first signal control board 201, a first digital display board 202, a first adapter board 203 and a first liquid crystal display 204; the second control channel 3 includes a second signal control board 301, a second digital display board 302, a second adapter board 303, and a second liquid crystal display 304; the third control channel 4 includes a third signal control board 401, a third digital display board 402, a third adapter board 403, and a third liquid crystal display 404. For each control channel, the signal control board and the digital display board can be inserted and plugged through the European style of the interface board and connected with external equipment through the connector, and the signal control board and the digital display board can be connected through the adapter board in a communication mode. For example, taking the first control channel 2 as an example, the first signal control board 201 and the first digital display board 202 may be inserted and plugged through an interface board, and connected to an external device through a connector, and the first signal control board 201 and the first digital display board 202 may be communicatively connected through the first adapter board 203. And each signal control board comprises an independent signal change-over switch, and the control channels corresponding to the signal change-over switches can be switched between a local signal mode and a remote signal mode by pulling the signal change-over switches.
For the TRT unit, an electrohydraulic servo system is adopted for TRT differential pressure power generation and bypass air release valve opening control, and a three-way servo controller, an electrohydraulic servo valve, a servo hydraulic cylinder, a displacement sensor and an actuating mechanism are combined to rapidly and accurately control the static blade and bypass opening.
In some embodiments, the three independent control channels 2-4 of the three-channel electrohydraulic servo controller provided by the application can work independently, have mutually independent PID control algorithms, and can also mutually independent power supplies for supplying power to the three control channels 2-4.
In some embodiments, the three-channel electrohydraulic servo controller provided by the application adopts a 19 inch standard industrial case, and the three control channels 2-4 are installed in the case 1 through mounting guide rails. The panel of the chassis 1 is provided with power switches corresponding to different control channels. The three control channels 2-4 consist of 9 circuit boards, the three-channel electrohydraulic servo controller further comprises three isolation power supplies corresponding to the three control channels 2-4 respectively, and the signal control board and the digital display board in each control channel are powered by the corresponding isolation power supplies respectively, so that the output of the signal control board is not affected when the digital display board fails. The isolation power supply is placed on the signal control board corresponding to the isolation power supply.
Fig. 2 shows a schematic diagram of the functional connections of a three-channel electro-hydraulic servo controller applied to a TRT according to an embodiment of the present application.
Referring to fig. 2, for each control channel, since it can operate independently, each control channel can receive command signals and feedback signals from an external device, and further, the liquid crystal display of each control channel can display at least parameters of the front panel display unit, current output parameters and position indication signal output parameters of each control channel, and after detecting that the command signals or feedback signals are lost, display of command loss alarm and display of feedback loss alarm can also be performed on the liquid crystal display.
In some embodiments, at least one of the three signal control boards 201, 301 and 401 receives a remote command signal given by a DCS (also referred to as a distributed control system), and performs signal conditioning on the command signal, performs switching processing when the remote command is lost, performs subtraction operation with a sensor feedback signal, performs power amplification after performing PID operation, and outputs a driving signal for driving a servo valve, thereby forming a closed loop control system. Under the action of the servo valve, the power oil acts on the servo oil cylinder to drive the stator blade and the bypass air release valve to reach the expected position, so that the purposes of adjusting the TRT stator blade and adjusting the bypass valve are achieved. The signal control boards 201, 301 and 401 provided by the application greatly improve the response speed and control precision of the system. The signal control boards 201, 301 and 401 output functional parameters, signal status bits and alarm status indications while outputting servo valve control signals.
Fig. 3 shows a schematic diagram of the working principle of a three-way electro-hydraulic servo controller according to an embodiment of the present application.
Referring to fig. 3, the signal control and digital display circuit principles in the signal control boards 201, 301 and 401 and the digital display boards 202, 302 and 402 all use signal photoelectric isolation to make them have strong current and voltage anti-interference capability. Meanwhile, a power supply and control signal ESD protection circuit is added, a liquid crystal display anti-static module is arranged, a servo controller is provided with an instruction signal and a feedback signal loss alarm, the instruction loss is automatically switched to local control, and a local signal adjusts a local output signal according to actual requirements of a site through a local knob. The signal positive and negative effect switching function is designed for being suitable for different sites and simultaneously in the control system of the controller, so that the signal positive and negative effect switching function can be better matched with users for use.
Fig. 4 shows a circuit schematic of a first protection circuit according to an embodiment of the present application.
In some embodiments, the power supply is isolated, reverse-connection protected, ESD protected, and over-current and over-voltage protected. A set of direct current 24V power supplies are externally input, but 15VDC, 10VDC are needed in the control circuit and the digital display circuit, and as shown in fig. 4, the DC-DC conversion is realized by using +24V through a DC-DC power supply chip U1. Referring to fig. 4, a first protection circuit includes: the DC-DC power chip, the fuse F1, the first diode D0, the second diode D1, the first capacitor C0, the second capacitor CY1, the third capacitor CY2 and the fourth capacitor C2; the first capacitor C0 is connected with the second capacitor CY1, the third capacitor CY2, the fourth capacitor C2 and the second diode D1 in parallel, the second capacitor CY1 is connected with the third capacitor CY2 in series, and the fuse F1 is connected with the first diode D0 and the DC-DC power supply chip U1 in series.
The direct current power supply 24V is input to the DC-DC chip U1 through the fuse F1 and the first diode D0, the fuse F1 realizes overcurrent protection on the three-channel electrohydraulic servo controller, the PTC self-recovery fuse F1 is adopted in design, when a circuit breaks down, the PTC self-recovery fuse F1 for overcurrent protection rapidly heats and is in a high-resistance state when the current greatly exceeds the rated current, and the circuit is in a relatively 'disconnected' state, so that the circuit is protected from being damaged. After the fault is removed, the fuse F1 automatically returns to a low-resistance state, and the circuit returns to normal operation. In fig. 4, the first capacitor C0, the second capacitor CY1 and the third capacitor CY2 form pi-type protection to suppress surge voltage; unnecessary harmonic waves are removed, current pulsation is reduced, current is smoother, and output is more stable. The voltage level of the first diode D0 is 1N4007, and the reverse connection prevention of the power supply is realized by utilizing the unidirectional conduction characteristic of the first diode D0; the second diode D1 selects a bipolar transient voltage suppression diode with the working reverse voltage of 40V, plays a role in protecting and suppressing voltage transient and impact, can prevent a power supply input end from damaging a power supply module due to transient high-voltage peak, has an electrostatic protection function, the second diode D1 and the fourth capacitor C2 jointly suppress surge voltage, and the fourth capacitor C2 selects a tantalum capacitor and plays a role in overvoltage protection. The output is isolated through the DC-DC power chip U1, and meanwhile, the output of + -15 VDC is realized.
Fig. 5 shows a circuit schematic of a step-down circuit according to an embodiment of the present application.
Referring to fig. 5, the three-channel electro-hydraulic servo controller further includes: a step-down circuit connected to the first protection circuit; a voltage step-down circuit comprising: a first regulator chip U3, a first matching resistor R3 and a third diode D2; the input pin of the first voltage-stabilizing regulator chip U3 is connected with +15V power supply voltage output by the first protection circuit, the adjustable voltage pin of the first voltage-stabilizing regulator chip U3 is connected with the first matching resistor R3 in series, and the output pin of the first voltage-stabilizing regulator chip U3 is connected with the third diode D2 in parallel and outputs +10V power supply voltage. The input of the first voltage-stabilizing regulator chip U3 is +15V to realize the voltage-reducing output of +10V, which is the result of matching and regulating the resistance values of the resistor R2 and the first matching resistor R3, and the bipolar transient voltage suppression diode D2 is added at the output end to play a role in electrostatic protection.
Fig. 6 shows a circuit schematic of a boost circuit according to an embodiment of the present application.
Referring to fig. 6, the three-channel electro-hydraulic servo controller further includes: a booster circuit connected to the first protection circuit; a boost circuit, comprising: a second regulator chip U2, a second matching resistor R5 and a fourth diode D3; the input pin of the second voltage-stabilizing regulator chip U2 is connected to the-15V power supply voltage output by the first protection circuit, the adjustable voltage pin of the second voltage-stabilizing regulator chip U2 is connected in series with the second matching resistor R5, and the output pin of the second voltage-stabilizing regulator chip U2 is connected in parallel with the fourth diode D3 and outputs the-10V power supply voltage. The second voltage-stabilizing regulator chip U2 inputs-15V to realize-10V boost output, which is the result of matching and regulating the resistance values of the second matching resistor R5 and the resistor R6, and the bipolar transient voltage suppression diode D3 is added at the output end to play a role in electrostatic protection.
Fig. 7 shows a circuit schematic of a second protection circuit according to an embodiment of the present application.
Referring to fig. 7, the control signal input mainly adopts a differential signal, so the design circuit of the control signal ESD protection protects from the differential signal, and thus the three-channel electro-hydraulic servo controller further includes: the second protection circuit is arranged on the signal control board; a second protection circuit comprising: the discharge tube G1, the first bipolar transient diode D10, the second bipolar transient diode D11, the first protection resistor R10, the second protection resistor R11 and the operational amplifier; the discharge tube G1 is connected to a first differential control signal-a and a second differential control signal +a input by the signal control board 201, 301 or 401 corresponding to the first differential control signal-a, the discharge tube G1 is respectively connected in parallel with the first bipolar transient diode D10 and the second bipolar transient diode D11, one end of the discharge tube G1 connected to the first differential control signal-a is connected in series with the first protection resistor R10 and the operational amplifier, and one end of the discharge tube G1 connected to the second differential control signal +a is connected in series with the second protection resistor R11 and the operational amplifier.
The differential signal of circuit design is connected with discharge tube G1, and under normal working condition it is turned off, and its interelectrode resistance can be up to above megaohm level. When the surge voltage exceeds the voltage-resistant strength of the circuit system, the discharge tube G1 breaks down to generate an arc discharge phenomenon, and the surge voltage is limited to rise in a short time, so that the overvoltage protection effect is provided for the circuit.
Fig. 8 shows a circuit schematic of an antistatic protection module according to an embodiment of the present application.
Referring to fig. 8, a power amplification driving module in a circuit board is output by a series resistor R20, and a bipolar transient voltage suppression diode D20 is arranged to form an antistatic protector, mainly comprising the shortest TVS response time and smaller flux.
The method and the way for realizing the ESD protection are numerous, and TVS (transient voltage suppressor) is adopted, so that the method is a solid-state diode which is specially used for preventing the ESD transient voltage from damaging a sensitive semiconductor device, has higher high-voltage bearing capacity than a zener diode, reduces the voltage cut-off rate, and has better protection effect on a working loop.
Fig. 9 shows a schematic structural view of a front panel of any one of the signal control boards according to the embodiment of the present application.
Referring to fig. 9, signal control performs status display and signal debugging through the panels, and function knobs and keys of the front panel on each signal control panel are identical and are used to control the control channels corresponding thereto. Taking the first signal control board 201 as an example, a signal switch 20111 for local and remote control selection is provided on the first front panel 2011, and a local knob 20112 for local signal adjustment is provided on the first front panel 2011, where the signal switch 20111 is used for selecting a working mode. Specifically, the remote control device comprises a local command signal input operation mode and a remote command signal input operation mode, if the remote control device dials to the local side and the given command signal is a local signal input, the local control knob 20112 adjusts the local command signal input to the first signal control board 201 within the full range; if the DCS is plugged into the remote side, the DCS provides a remote command signal input to the first signal control board 201, and the mode is used in the field remote control. In the remote working mode, if the instruction signal of the DCS is lost, the control channel for accessing the remote signal will automatically switch to the local mode, and meanwhile, the instruction loss indicator 20113 is on to give an alarm to the site, and once the remote DCS instruction signal is recovered, the remote working mode will be immediately switched to the remote working mode, and the instruction loss indicator 20113 is off.
In some embodiments, the first front panel 2011 is further provided with a displacement transducer zero adjustment knob 20114, a displacement transducer full stroke adjustment knob 20115, a displacement signal output zero adjustment knob 20116, a displacement signal output full stroke adjustment knob 20117, a gain adjustment knob 20118, and a zeroing adjustment knob 20119. The displacement transmitter zero point adjusting knob 20114 and the displacement transmitter full stroke adjusting knob 20115 are feedback signals which need to be adjusted in PID operation, the feedback signals are real-time tracking of the stroke size of the servo oil cylinder, and the zero point and the stroke are parameters which are debugged in advance according to a system in the debugging process. Because the hydraulic system has stronger nonlinearity, time lag and inertia, zero position leakage and mechanical friction of the system are included, errors can be caused in different using site electrohydraulic servo control systems, and the output of a sensor and a corresponding servo system form a linear control system according to the zero point adjusting knob 20114 of the fine-tuning displacement transmitter and the full stroke adjusting knob 20115 of the displacement transmitter.
The displacement signal output in the first front panel 2011 refers to an electric signal corresponding to an actual position signal of an actual servo system to be controlled, and the actual position of the servo system and an expected position of the controller output are ensured to be consistent by adjusting the displacement signal output zero-point adjusting knob 20116 and the displacement signal output full-stroke adjusting knob 20117.
The gain of the PID system of the control panel is regulated through the gain regulating knob 20118, and the parameter of the gain influences the stability and reliability of field control, so that oscillation and overshoot are not generated in field debugging.
The zero point of the PID system of the control panel is regulated through a zeroing regulating knob 20119, for example, in a system with 4-20mA remote command signals, the command signals are input into 4mA, the displacement transmitter signals are 4mA through regulating the offset knob, the displacement transmitter signals can be seen through liquid crystal display, and the oil cylinder is at a certain limit position at the moment, so that the correspondence between the zero point of an electric signal and a certain limit position (zero position) of a mechanical stroke is ensured.
In some embodiments, at least any one control channel of the three-channel electrohydraulic servo controller in the embodiments of the application can be selected for use according to the field use condition and requirements, and the application can also be applied to the industrial control field.
In some embodiments, the chassis 1 may be 485mm in length, 355mm in width, and 148mm in height.
The three-channel electrohydraulic servo controller applied to TRT provided by the embodiment of the application comprises: a chassis; three independent control channels installed inside the case; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board; the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector; the signal control board is in communication connection with the digital display board through the adapter plate; the signal control board comprises: a signal change-over switch; and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode. The three independent control channels can meet the control requirements of the static blade and bypass of the TRT turbine at the same time, can save the occupation of site use space, enable the three-channel electrohydraulic servo controller to respond faster by independently developing the related PID operation analog circuit, have higher control precision, and can display some functional parameters and working states in PID operation through the digital display board for indicating the working state of the TRT system. The three independent control channels can control the opening of the turbine stationary blade and the opening of the bypass valve at the same time, corresponding servo controllers are not required to be configured for control, and the space and the cost are saved.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity.
This application is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and the like, which are within the spirit and principles of the application, are intended to be included within the scope of the present application.
Claims (10)
1. A three-channel electro-hydraulic servo controller for a TRT, comprising:
a chassis;
three independent control channels installed inside the case; wherein each of the control channels comprises: the device comprises a signal control board, a digital display board and an adapter board;
the signal control board is inserted and plugged with the digital display board through European style of an interface board and is connected with external equipment through a connector;
the signal control board is in communication connection with the digital display board through the adapter plate;
the signal control board comprises: a signal change-over switch;
and toggling the signal change-over switch to enable the corresponding control channel to switch between a local signal mode and a remote signal mode.
2. The three-channel electro-hydraulic servo controller applied to a TRT as set forth in claim 1, further comprising: isolating the power supply; the isolated power supply supplies power to the signal control board and the digital display board through the adapter board.
3. The three-channel electro-hydraulic servo controller applied to a TRT as set forth in claim 2, further comprising: a first protection circuit connected to the isolated power supply;
the first protection circuit includes: the DC-DC power chip, the fuse, the first diode, the second diode, the first capacitor, the second capacitor, the third capacitor and the fourth capacitor;
the first capacitor is connected in parallel with the second capacitor, the third capacitor, the fourth capacitor and the second diode, the second capacitor is connected in series with the third capacitor, and the fuse is connected in series with the first diode and the DC-DC power chip; the DC-DC power supply chip is connected with a +24V direct current power supply and outputs +/-15V direct current voltage; the first capacitor, the second capacitor and the third capacitor form a pi-type protection structure for inhibiting surge voltage in the first protection circuit.
4. The three-way electro-hydraulic servo controller for TRT according to claim 3, wherein the fuse is a PTC self-restoring fuse.
5. The three-way electro-hydraulic servo controller for a TRT according to claim 3, wherein the fourth capacitor is a tantalum capacitor.
6. The three-channel electro-hydraulic servo controller for a TRT as set forth in claim 3, further comprising: a step-down circuit connected to the first protection circuit;
the step-down circuit includes: the first voltage stabilizing regulator chip, the first matching resistor and the third diode;
the input pin of the first voltage-stabilizing regulator chip is connected with the +15V power supply voltage output by the first protection circuit, the adjustable voltage pin of the first voltage-stabilizing regulator chip is connected with the first matching resistor in series, and the output pin of the first voltage-stabilizing regulator chip is connected with the third diode in parallel and outputs +10V power supply voltage.
7. The three-channel electro-hydraulic servo controller for a TRT as set forth in claim 3, further comprising: a booster circuit connected to the first protection circuit;
the booster circuit includes: the second voltage stabilizing regulator chip, the second matching resistor and the fourth diode;
the input pin of the second voltage-stabilizing regulator chip is connected with the-15V power supply voltage output by the first protection circuit, the adjustable voltage pin of the second voltage-stabilizing regulator chip is connected with the second matching resistor in series, and the output pin of the second voltage-stabilizing regulator chip is connected with the fourth diode in parallel and outputs the-10V power supply voltage.
8. The three-channel electro-hydraulic servo controller applied to a TRT as set forth in claim 1, further comprising: the second protection circuit is arranged on the signal control board;
the second protection circuit includes: the device comprises a discharge tube, a first bipolar transient diode, a second bipolar transient diode, a first protection resistor, a second protection resistor and an operational amplifier;
the discharge tube is connected into a first differential control signal and a second differential control signal which are input by the signal control board, the discharge tube is respectively connected with the first bipolar transient diode and the second bipolar transient diode in parallel, one end of the discharge tube, which is connected into the first differential control signal, is connected with the first protection resistor and the operational amplifier in series, and one end of the discharge tube, which is connected into the second differential control signal, is connected with the second protection resistor and the operational amplifier in series.
9. The three-way electro-hydraulic servo controller for a TRT according to claim 1, wherein the signal change-over switch is switched to the remote signal mode, and the signal control board is connected to a remote command issued by a distributed control system.
10. The three-way electro-hydraulic servo controller for a TRT according to claim 9, wherein the signal control board is configured to automatically switch to the local signal mode in response to detecting disappearance of the remote command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122960379.9U CN219435249U (en) | 2021-11-26 | 2021-11-26 | Three-channel electrohydraulic servo controller applied to TRT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122960379.9U CN219435249U (en) | 2021-11-26 | 2021-11-26 | Three-channel electrohydraulic servo controller applied to TRT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219435249U true CN219435249U (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122960379.9U Active CN219435249U (en) | 2021-11-26 | 2021-11-26 | Three-channel electrohydraulic servo controller applied to TRT |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219435249U (en) |
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2021
- 2021-11-26 CN CN202122960379.9U patent/CN219435249U/en active Active
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