阅读说明：本技术 执行机构控制系统及方法 (Actuator control system and method ) 是由 郭勇 薛佳 赵述禹 焦忠林 陈明亮 许洪德 杨铁男 宫喜鹏 于海生 李瑾秋 张忠 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种执行机构控制系统及方法,包括变频器、控制器、过流保护器、阀位反馈电路和电机,变频器分别与控制器和过流保护器电连接,阀位反馈电路与控制器电连接,过流保护器还与电机电连接；控制器接收远方控制指令和执行机构通过阀位反馈电路反馈的阀位信号,实现闭环控制并且实时消除反馈和指令偏差；变频器接收控制器的控制指令并驱动电机正转或反转,过流保护器用于保护电机。本发明提供的执行机构控制系统及方法将SIPOS5执行机构控制技术进行了改进,使得整个系统结构更为简单,采用的元器件价格低廉,实用可靠,有效的降低了维护成本,同时提高执行机构稳定性,减少了检修人员的维护量。(The invention discloses an actuating mechanism control system and a method, comprising a frequency converter, a controller, an overcurrent protector, a valve position feedback circuit and a motor, wherein the frequency converter is respectively and electrically connected with the controller and the overcurrent protector; the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time; the frequency converter receives the control instruction of the controller and drives the motor to rotate forwards or backwards, and the overcurrent protector is used for protecting the motor. The execution mechanism control system and the execution mechanism control method provided by the invention improve the SIPOS5 execution mechanism control technology, so that the whole system structure is simpler, the adopted components are low in price, practical and reliable, the maintenance cost is effectively reduced, the stability of the execution mechanism is improved, and the maintenance amount of maintainers is reduced.)

1. An actuating mechanism control system is characterized by comprising a frequency converter, a controller, an overcurrent protector, a valve position feedback circuit and a motor, wherein the frequency converter is electrically connected with the controller and the overcurrent protector respectively;

the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time;

the frequency converter receives a control instruction of the controller and drives the motor to rotate forwards or backwards;

the overcurrent protector is used for protecting the motor.

2. The actuator control system according to claim 1, wherein the valve position feedback circuit includes a limit switch, a transmitter, and a potentiometer, one end of the limit switch is electrically connected to the controller, the other end of the limit switch is connected to the transmitter, the transmitter is connected to the potentiometer, the transmitter converts a resistance signal of the potentiometer into a current signal as an opening degree value, and the limit switch is used to determine a terminal position.

3. The actuator control system of claim 2, wherein the transducer converts the potentiometer resistance signal from 0-5K Ω to a current signal as an opening value.

4. The actuator control system of claim 1, wherein the controller detects a control command or a loop disconnection or short circuit signal fed back by the valve position feedback circuit and controls the actuator to maintain a current position.

5. The actuator control system of claim 1, wherein the actuator control system has a remote mode of operation and a local mode of operation, the remote mode of operation and the local mode of operation being interlocked.

6. The actuator control system of claim 1 wherein the controller receives the motor temperature and inhibits activation of the motor when the motor temperature is above a set point.

7. The actuator control system according to claim 1, further comprising an operation control panel that displays an actuator state and a current opening value.

8. The actuator control system of claim 1, wherein the control command and the valve position signal are both 4-20 mA.

9. The actuator control system of claim 1, wherein the motor start and operating current is less than 2A.

10. An actuator control method characterized by implementing a method using the actuator control system according to any one of claims 1 to 9,

the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time;

the frequency converter receives the control instruction of the controller and drives the motor to rotate forwards or backwards, so that the switch of the actuating mechanism is controlled.

Technical Field

The invention relates to the technical field of SIPOS5 actuator control, in particular to a control system and a control method of a regulating SIPOS5 actuator.

Background

At present, the SIPOS5 type actuating mechanism is widely applied to a thermal system production process system of a power plant, such as adjustment of superheated steam and reheated steam desuperheating water of a boiler, adjustment of over-fired air of the boiler, adjustment of a primary cold and hot air adjusting baffle at an inlet of a coal mill and the like. The actuator is provided with an adjusting type and a turn-off type according to the process requirements, the adjusting type receives a remote 4-20mA control instruction, the control part comprises a power panel, a control panel, an IGBT module and the like, the forward and reverse rotation switching control of the motor is realized by the IGBT, the safe operation of the unit is seriously affected due to high failure rate of the power panel, more damage and very large maintenance amount, and the capital required by purchasing spare parts is about 30-40 ten thousand, so a great deal of financial resources are greatly wasted; therefore, an improved SIPOS5 actuator control technique is sought, which is urgently needed for the current SIPOS5 actuator control technology field.

Disclosure of Invention

Therefore, the embodiment of the invention provides a control system and a control method for an adjustable SIPOS5 actuating mechanism, which aim to solve the problems of high failure rate of a power panel, more damages, very large maintenance amount, serious influence on the safe operation of a unit and high cost in the prior art.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

an actuating mechanism control system comprises a frequency converter, a controller, an overcurrent protector, a valve position feedback circuit and a motor, wherein the frequency converter is electrically connected with the controller and the overcurrent protector respectively;

the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time;

the frequency converter receives a control instruction of the controller and drives the motor to rotate forwards or backwards;

the overcurrent protector is used for protecting the motor.

Further, valve position feedback circuit includes limit switch, changer and potentiometre, limit switch one end with the controller electricity is connected, the other end with the changer is connected, the changer with the potentiometre is connected, the changer will the resistance signal of potentiometre converts current signal into as aperture numerical value, limit switch is used for judging the terminal position.

Furthermore, the transmitter converts the resistance signal of the potentiometer from 0K omega to 5K omega into a current signal as an opening numerical value.

Further, the controller detects a control command or a loop disconnection or short-circuit signal fed back by the valve position feedback circuit and controls the actuating mechanism to keep at the current position.

Further, the actuator control system has a remote mode of operation and a local mode of operation, which are interlocked.

Further, the controller receives the motor temperature, and the motor is prohibited from starting when the motor temperature is higher than a set value.

Further, the device also comprises an operation control panel, and the operation control display panel displays the state of the actuating mechanism and the current opening value.

Further, the control command and the valve position signal are both 4-20 mA.

Further, the starting and working current of the motor is less than 2A.

In a second aspect, an actuator control method is applied to the actuator control system to realize the following method,

the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time;

the frequency converter receives the control instruction of the controller and drives the motor to rotate forwards or backwards, so that the switch of the actuating mechanism is controlled.

The invention has at least the following beneficial effects: an actuating mechanism control system and a method thereof comprise a frequency converter, a controller, an overcurrent protector, a valve position feedback circuit and a motor, wherein the frequency converter is respectively electrically connected with the controller and the overcurrent protector; the controller receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit, closed-loop control is realized, and feedback and instruction deviation are eliminated in real time; the frequency converter receives the control instruction of the controller and drives the motor to rotate forwards or backwards, and the overcurrent protector is used for protecting the motor. The execution mechanism control system and the execution mechanism control method provided by the invention improve the SIPOS5 execution mechanism control technology, so that the whole system structure is simpler, the adopted components are low in price, practical and reliable, the maintenance cost is effectively reduced, the stability of the execution mechanism is improved, and the maintenance amount of maintainers is reduced.

Drawings

In order to more clearly illustrate the prior art and the present invention, the drawings which are needed to be used in the description of the prior art and the embodiments of the present invention will be briefly described. It should be apparent that the drawings in the following description are merely exemplary, and that other drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.

The structures, proportions, sizes, and other dimensions shown in the specification are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, and it is to be understood that all such modifications, changes in proportions, or alterations in size which do not affect the efficacy or objectives of the invention are not to be seen as within the scope of the present invention.

Fig. 1 is a block diagram of an actuator control system according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an actuator control system according to an embodiment of the present invention.

Description of reference numerals:

1-a frequency converter; 2-an over-current protector; 3, a motor; 4-a controller; 5-valve position feedback circuit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "first," "second," "third," "fourth," and the like in the description and claims of the present invention and in the above-described drawings (if any) are intended to distinguish between referenced items. For a scheme with a time sequence flow, the term expression does not need to be understood as describing a specific sequence or a sequence order, and for a scheme of a device structure, the term expression does not have distinction of importance degree, position relation and the like.

Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements specifically listed, but may include other steps or elements not expressly listed that are inherent to such process, method, article, or apparatus or that are added to a further optimization scheme based on the present inventive concept.

Referring to fig. 1, an embodiment of the present invention provides an actuator control system, specifically an adjustable SIPOS5 actuator control system, including a frequency converter 1, a controller 4, an overcurrent protector 2, a valve position feedback circuit 5 and a motor 3, where the frequency converter 1 is electrically connected to the controller 4 and the overcurrent protector 2, the valve position feedback circuit 5 is electrically connected to the controller 4, and the overcurrent protector 2 is also electrically connected to the motor 3; the controller 4 receives a remote 4-20mA control instruction and a 4-20mA valve position signal fed back by the actuating mechanism through the valve position feedback circuit 5, so that closed-loop control is realized and feedback and instruction deviation are eliminated in real time; the frequency converter 1 receives a control instruction of the controller 4 and drives the motor 3 to rotate forwards or backwards so as to control the switch of the actuating mechanism; the frequency conversion technology is adopted, the rotating speed and the voltage of the motor 3 are adjusted according to needs, so that the starting of the motor 3 is controlled, the working current does not exceed 2A, and the motor is protected from being damaged. The invention removes the components of the SIPOS5 actuating mechanism, such as the power panel, the control panel and the IGBG, and uses the frequency converter 1 and the controller 4 to realize the forward and reverse rotation switching control of the motor 3, so that the whole system structure is simpler, the price of the adopted components is low, the invention is practical and reliable, and the maintenance cost is effectively reduced.

The valve position feedback circuit 5 comprises a limit switch, a transmitter and a potentiometer, one end of the limit switch is electrically connected with the controller 4, the other end of the limit switch is connected with the transmitter, the transmitter is connected with the potentiometer, the transmitter converts a resistance signal of the potentiometer from 0K omega to 5K omega into a current signal serving as an opening degree value, and the limit switch is used for judging the position of a terminal. And valve position feedback signals are detected through the valve position transmitter, so that the whole control system forms closed-loop control. The stability of the actuating mechanism is improved, and the maintenance amount of maintainers is reduced.

In the invention, the whole system has a function of signal break and position protection and an over-moment protection function, the controller 4 can detect a control instruction or a loop disconnection or short circuit signal fed back by the valve position feedback circuit 5, then control the actuating mechanism to keep at the current position, and send alarm information to remind maintenance personnel; when the torque is over, the overcurrent protector 2 acts to cut off the power supply, so that the motor 3 is protected from being damaged.

In the invention, the whole system also has a remote operation mode and a local operation mode, and the remote operation mode and the local operation mode are mutually locked. The controller 4 is also capable of receiving the temperature of the motor 3 and inhibiting the motor 3 from starting when the temperature of the motor 3 is higher than a set value.

The whole system also comprises an operation control panel which displays the remote/local, on/off, fault and other states of the actuating mechanism and the current opening value.

Referring to fig. 2, external three-phase power is transformed by a transformer B and then is electrically connected to R, S and T pins of a frequency converter TF, U, V and W pins of the frequency converter TF are electrically connected to one end of an overcurrent protector DB on the three-phase power, the other end of the overcurrent protector DB is electrically connected to a motor M, a 24V pin, an X1 pin and a COM pin of the frequency converter TF are electrically connected to a 24V pin, a Q0.1 and a Q0.2 of a processor DPU, respectively, an AI1.1 pin of the processor DPU receives a remote control command of 4-20mA, and an AI1.2 pin of the processor DPU receives a position feedback command of 4-20 mA. The controller adopts a PLC controller, and the control instruction and the valve position are fed back to form closed loop regulation, so that the executing mechanism acts along with the control instruction.

An actuator control method, which is realized by an actuator control system,

the controller 4 receives a remote control instruction and a valve position signal fed back by the actuating mechanism through the valve position feedback circuit 5, so that closed-loop control is realized and feedback and instruction deviation are eliminated in real time;

the frequency converter 1 receives the control instruction of the controller 4 and drives the motor 3 to rotate forwards or backwards, thereby controlling the switch of the actuating mechanism.

In summary, the invention has the following advantages:

1. the SIPOS5 actuator control technology is improved, a closed-loop control is formed by configuring a frequency converter, a PLC (programmable logic controller), an overcurrent protector and the like in a motor control loop, the overcurrent burning loss condition of the motor is effectively prevented, the working stability of the motor is greatly improved, and meanwhile, the abnormal action of the actuator is prevented from causing the abnormal change of production process parameters by designing the wire breakage and short signal protection;

2. the SIPOS5 actuator control technology is improved, the control unit is integrally simplified, the structure of the whole system is simpler, the system is particularly suitable for working under the condition of severe environment, the maintenance cost is effectively reduced, expensive electronic plates are not required to be purchased, the control precision completely meets the requirements of a production field, the price of components is low, the system is practical and reliable, 30-40 ten thousand yuan of purchasing fund can be effectively saved, the stability of the actuator is improved, and the maintenance amount of maintainers is reduced.

All the technical features of the above embodiments can be arbitrarily combined (as long as there is no contradiction between the combinations of the technical features), and for brevity of description, all the possible combinations of the technical features in the above embodiments are not described; these examples, which are not explicitly described, should be considered to be within the scope of the present description.

The present invention has been described in considerable detail by the general description and the specific examples given above. It should be noted that it is obvious that several variations and modifications can be made to these specific embodiments without departing from the inventive concept, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.