CN106337849A - TRT machine static-blade direct-drive electro-hydraulic servo control system - Google Patents

Abstract

The invention discloses a stationary vane direct-drive electro-hydraulic servo control system of a TRT unit, which belongs to the technical field of electro-hydraulic servo and includes a stationary vane actuator, a direct-drive electro-hydraulic servo mechanism, a first electromagnetic cut-off valve and a second electromagnetic servo control system. The cut-off valve and the stationary vane actuator are composed of hydraulic cylinder 1, hydraulic cylinder 2 and stationary vane angle adjustment mechanism, and the direct-drive electro-hydraulic servo mechanism is composed of a servo motor and a bidirectional quantitative pump. The invention not only satisfies the precise servo control requirements of the stationary vane actuator during the normal operation of the stationary vanes of the TRT unit, but also solves the problems of the traditional electro-hydraulic servo control system, such as low efficiency, high energy consumption, many fault points, and complicated operation and maintenance. Under the premise of affecting the control accuracy and response characteristics of the system, it can greatly reduce the cost of the stator blade servo control device of the TRT unit, simplify the control scheme, and improve the safety and reliability of the stator blade servo control of the TRT unit. The invention is applicable to the control of the servo system of the stationary blades of various TRT units.

Description

A Direct-drive Electro-hydraulic Servo Control System for Stationary Blades of TRT Units

technical field

The invention belongs to the technical field of electro-hydraulic servo, and in particular relates to a direct-drive electro-hydraulic servo control system for stationary blades of a TRT unit.

Background technique

TRT unit is a major energy-saving equipment for blast furnace smelting. The long-term stable operation of TRT unit can not only reduce the production cost of iron and steel enterprises, save energy and reduce consumption, reduce environmental pollution, but also have more considerable economic and social benefits. The stator blade adjustment device is an important executive mechanism of the TRT unit, and its control performance and system stability play a vital role in the safe and efficient operation of the TRT unit. With the rapid development of industrial control technology, the performance requirements for the vane control device of TRT units are constantly increasing. The electro-hydraulic servo system is widely used in the control of the stationary vane actuator of the TRT unit due to its characteristics of fast response, high control precision, good stability, and easy automatic control. The traditional electro-hydraulic servo system uses a hydraulic pump station to provide the power source, and performs servo control on the vane actuator through the electro-hydraulic servo valve. Due to the throttling loss and overflow loss of the valve control system, its outstanding disadvantages are low efficiency and high energy consumption; at the same time, due to the use of servo valves and hydraulic pump stations, the system has high requirements for oil cleanliness and many failure points , and the level of maintenance operations has increased accordingly. With the rapid development of microelectronics technology and AC variable frequency speed regulation technology, coupled with breakthroughs in servo motor materials, structure and control theory, the response characteristics and control accuracy of servo motors have been greatly improved, and a new type of servo motor has emerged. The servo drive method is the direct drive electro-hydraulic servo system.

The direct-drive electro-hydraulic servo system uses a servo motor to drive a two-way quantitative pump. The output flow and direction of the two-way pump are changed by changing the speed and direction of the servo motor, and the system pressure is controlled by controlling the torque of the servo motor, so as to realize the replacement of the actuator. direction, speed regulation and pressure regulation. Since these three functions are directly controlled by the servo motor, there is no need for hydraulic pump stations, servo valves, pressure reducing valves, and intermediate piping, etc., thereby eliminating the common valve stuck faults of traditional electro-hydraulic servo systems and greatly reducing the system’s need for oil cleaning. Accurate requirements, reducing energy consumption and failure points. Therefore, compared with the traditional electro-hydraulic servo system, the direct-drive electro-hydraulic servo system has the advantages of energy saving, environmental protection, investment saving, long life, high reliability and simple maintenance and operation.

Contents of the invention

The purpose of the present invention is to provide a direct-drive electro-hydraulic servo control system for the deficiencies of the traditional electro-hydraulic servo control device for the stationary vane of the TRT unit, which not only meets the precise servo control requirements of the hydraulic cylinder of the actuator when the stationary vane of the TRT unit is in normal operation , which solves the problems of low efficiency, high energy consumption, many fault points and complex operation and maintenance of the traditional electro-hydraulic servo control system, and can greatly reduce the servo control device of the stator blade of the TRT unit without affecting the control accuracy and response characteristics of the system. Reduce costs, simplify the control scheme, and improve the safety and reliability of the servo control of the stator blades of the TRT unit. The invention is applicable to the control of the servo system of the stationary blades of various TRT units.

The technical solution provided by the present invention is: a stationary vane direct-drive electro-hydraulic servo control system of a TRT unit, including a stationary vane actuator, a direct-drive electro-hydraulic servo mechanism, a first electromagnetic shut-off valve and a second electromagnetic shut-off valve, The stationary vane actuator is composed of hydraulic cylinder 1, hydraulic cylinder 2 and stationary vane angle adjustment mechanism. The direct-drive electro-hydraulic servo mechanism is composed of a servo motor and a bidirectional quantitative pump. The servo motor is connected to the bidirectional quantitative pump, and its forward rotation drives the bidirectional quantitative pump. Oil is supplied from oil port A of the pump, and oil is returned from oil port B, and its reversal drives oil supply to oil port B of the two-way quantitative pump, and oil return from oil port A; the oil port of the two-way quantitative pump is connected to the hydraulic cylinder through the first electromagnetic cut-off valve. The rodless cavity of cylinder 2 is connected together, and the B oil port is connected with the rod cavity of hydraulic cylinder 1 and hydraulic cylinder 2 through the second electromagnetic shut-off valve; the first electromagnetic shut-off valve and the second electromagnetic shut-off valve make The conduction of the oil circuit can realize the closed-loop motion control of the position of hydraulic cylinder 1 and hydraulic cylinder 2, and it can cut off the oil circuit in the state of power failure, which can realize the current position stop control of the vane angle adjustment mechanism.

In order to better realize this scheme, it is possible to supply oil to the rodless cavity of the two hydraulic cylinders of the stationary vane actuator and to limit the reverse flow and eliminate the pressure fluctuation of the rod cavity oil circuit of the two hydraulic cylinders of the stationary vane actuator. It has the following structure: it also includes a hydraulic control valve, a one-way valve and an accumulator, the accumulator is connected to the A port of the bidirectional quantitative pump through a hydraulic control valve, and connected to the B port of the bidirectional quantitative pump through a one-way valve , also directly connected with the third oil port of the two-way quantitative pump.

In order to better realize this solution, it is possible to prevent the overpressure of the two chambers of the two hydraulic cylinders of the stationary vane actuator. The rodless chambers of hydraulic cylinder two are connected through the first safety valve, and the rod chambers of hydraulic cylinder one and hydraulic cylinder two are connected through the second safety valve.

In order to better realize this solution, the working pressure of the accumulator can be monitored, and the special configuration is as follows: a first pressure sensor is also included, and the first pressure sensor is arranged on the oil circuit of the accumulator.

In order to better realize this project and assist the maintenance of the TRT unit, the special configuration is as follows: it also includes a third electromagnetic cut-off valve, and the rod chamber and rodless chamber of hydraulic cylinder 1 and hydraulic cylinder 2 pass through the third electromagnetic valve. The cut-off valve is connected, and the third electromagnetic cut-off valve can realize the current position adjustment of the vane angle adjustment mechanism when the third electromagnetic cut-off valve is in the energized state. The connection between the cavities is severed.

In order to better realize this solution, it is possible to monitor the working pressures of the two cavities and the oil passages of the two hydraulic cylinders of the vane actuator. The sensors are arranged on the rodless cavity oil circuits of hydraulic cylinder one and hydraulic cylinder two, and the third pressure sensor is arranged on the rod cavity oil circuits of hydraulic cylinder one and hydraulic cylinder two.

In order to better realize this solution, the displacement of the hydraulic cylinder of the stationary vane actuator can be monitored, and the special configuration is as follows: a displacement sensor is also included, and the displacement sensor is set on the first hydraulic cylinder or the second hydraulic cylinder.

Through the above solution, the present invention adopts the servo motor to drive the bidirectional quantitative pump to control the double chamber of the asymmetrical hydraulic cylinder. The A oil port of the two-way quantitative pump is connected to the rodless chamber of the two hydraulic cylinders of the stationary vane actuator at the same time, and the B oil port is connected to the rod chamber of the two hydraulic cylinders of the stationary vane actuator at the same time, so that the stationary vane is implemented through the control of the servo motor. The pressure and flow control of the two chambers of the hydraulic cylinder of the mechanism; a displacement sensor is installed on one of the hydraulic cylinders of the stationary vane actuator, and a pressure sensor is installed on the two-chamber oil circuit of the hydraulic cylinder of the stationary vane actuator, and the signals of the displacement sensor and the pressure sensor are connected. The controller outputs control instructions to the servo motor driver, and the servo motor driver drives the servo motor to run according to the instructions, thereby controlling the flow output of the bidirectional pump connected to the servo motor, and finally realizing the fast position and output of the hydraulic cylinder of the vane actuator. , Precise control, so as to control the vane angle adjustment mechanism to achieve the vane opening required by the TRT unit.

Compared with the prior art, the beneficial technical effect of the present invention is:

1. The present invention uses a servo motor to drive a two-way pump to realize the motion control of the hydraulic cylinder of the stationary vane actuator, which solves the problem of low efficiency, high energy consumption, high oil cleanliness requirements, and the probability of valve stuck in the traditional electro-hydraulic servo control system of the stationary vane actuator. It can greatly reduce the cost of the stator blade servo control device of the TRT unit, simplify the control scheme, and improve the safety and reliability of the stator blade servo control of the TRT unit without affecting the control accuracy and response characteristics of the system;

2. The present invention uses an accumulator to connect the two chambers of the hydraulic cylinder, which not only solves the problem of pressure fluctuations during the movement of the hydraulic cylinder, but also solves the problem of unbalanced flow of the asymmetrical hydraulic cylinder. Control provides advantages;

3. The present invention uses an electromagnetic cut-off valve to connect the two cavities of the hydraulic cylinder of the stationary vane actuator, so as to realize the position adjustment of the hydraulic cylinder of the stationary vane actuator in the maintenance state.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structure schematic diagram of the direct-drive electro-hydraulic servo control system of the TRT set vane of the present invention;

Reference signs: 1—servo motor, 2—two-way quantitative pump, 3—hydraulic control valve, 4—one-way valve, 5—first pressure sensor, 6—accumulator, 7—first safety valve, 8—first Two safety valves, 9—the first electromagnetic shut-off valve, 10—the second electromagnetic shut-off valve, 11—the third electromagnetic shut-off valve, 12—the second pressure sensor, 13—the third pressure sensor, 14—displacement sensor, 15.1—hydraulic pressure Cylinder 1, 15.2—hydraulic cylinder 2, 15.3—stator blade angle adjustment mechanism, 16—TRT unit PLC, 17—controller, 18—driver.

detailed description

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

As shown in Figure 1, a TRT unit static vane direct-drive electro-hydraulic servo control system in this embodiment includes a servo motor 1, a bidirectional quantitative pump 2, a hydraulic control valve 3, a one-way valve 4, and a first pressure Sensor 5, accumulator 6, first safety valve 7, second safety valve 8, first electromagnetic shut-off valve 9, second electromagnetic shut-off valve 10, third electromagnetic shut-off valve 11, second pressure sensor 12, third pressure Sensor 13, displacement sensor 14, hydraulic cylinder one 15.1, hydraulic cylinder two 15.2, vane angle adjustment mechanism 15.3, TRT unit PLC16, controller 17, driver 18. Among them, the first hydraulic cylinder 15.1, the second hydraulic cylinder 15.2, and the vane angle adjustment mechanism 15.3 form the stationary vane actuator. Servo motor 1 is connected to two-way quantitative pump 2, and the forward rotation of servo motor 1 drives the two-way quantitative pump 2A oil port to supply oil, and B oil port returns oil; the reverse rotation of servo motor 1 drives the B oil port of two-way quantitative pump 2 to supply oil, A The oil port returns oil. The oil port A of the two-way quantitative pump 2 is connected to the rodless cavity of the first hydraulic cylinder 15.1 and the second hydraulic cylinder 15.2 of the stationary vane actuator through the first electromagnetic cut-off valve 9, and the B oil port of the two-way quantitative pump 2 passes through the second electromagnetic cut-off valve 10 It is connected with the rod cavity of hydraulic cylinder 1 15.1 and hydraulic cylinder 2 15.2 of the stationary vane actuator. Under normal conditions, it is energized to make the oil circuit conduction, which can realize the position closed-loop motion control of hydraulic cylinder 1 15.1 and hydraulic cylinder 2 15.2. Locking the vane angle adjustment mechanism 15.3 to the current position in the power-off state can realize the stop function of the vane angle adjustment mechanism 15.3, and maintain the current opening of the vane in the fault state; the accumulator 6 communicates with the two-way quantitative The port A of the pump 2 is connected to the oil port B of the two-way quantitative pump 2 through the check valve 4, and is also directly connected to the third oil port of the two-way quantitative pump 2; Supplementing oil to the rodless cavity of hydraulic cylinder 1 15.1 and hydraulic cylinder 2 15.2 of the stationary vane actuator. The rod cavity oil circuit can limit the reverse flow and eliminate the pressure fluctuation of the oil circuit; the first safety valve 7 and the second safety valve 8 are respectively installed in the two chambers of the hydraulic cylinder of the vane actuator to prevent the two chambers of the hydraulic cylinder from overpressure; The third electromagnetic cut-off valve 11 is connected to the two cavities of the hydraulic cylinder of the vane actuator. Under normal working conditions, the third electromagnetic cut-off valve 11 is in a de-energized state, and is used to cut off the connection between the two cavities of the hydraulic cylinder of the vane actuator; When the third electromagnetic cut-off valve 11 is powered on, it is connected to the two chambers of the hydraulic cylinder of the vane actuator, and is used for position adjustment of the vane angle adjustment mechanism 15.3 in the maintenance state of the TRT unit; the two chambers of the accumulator 6 and the hydraulic cylinder of the vane actuator The first pressure sensor 5, the second pressure sensor 12, and the third pressure sensor 13 are respectively installed in the cavity to monitor the pressure change in real time; a displacement sensor 14 is installed on a hydraulic cylinder of the vane actuator; the first pressure sensor 5, the second pressure sensor The signal output or input end of two pressure sensors 12, the third pressure sensor 13, displacement sensor 14, the first electromagnetic shut-off valve 9, the second electromagnetic shut-off valve 10, and the third electromagnetic shut-off valve 11 are communicated with the controller 17; the controller 17 Receive the control command from the TRT unit PLC16 and feed back the relevant status signals of the stator blade actuator to the TRT unit PLC16. The controller 17 combines the position feedback signal of the displacement sensor 14 of the stator blade actuator according to the control command of the TRT unit PLC16, through the internal After the control algorithm is calculated, the drive command is output to the driver 18; the drive command of the driver 18 is output to the servo motor 1, and the servo motor 1 drives the bidirectional quantitative pump 2 to output pressure oil to control the hydraulic cylinder of the vane actuator to perform corresponding actions according to the command requirements .

Specifically, the following operation modes are used to assist in understanding the working principle of the present invention:

1. In the normal operation state of the TRT unit, when the opening of the vane actuator increases, the corresponding hydraulic cylinder piston rod extends:

The controller receives the control command from the PLC of the TRT unit, and after calculation, sends out a displacement extension command to the driver. The driver drives the servo motor to rotate in the forward direction, and the servo motor drives the two-way quantitative pump to supply oil at oil port A and return oil at port B. The cut-off valve cuts off the oil circuit between the two chambers of the hydraulic cylinder of the stationary vane actuator; the first electromagnetic shut-off valve is powered on, and the pressure oil at the port A of the two-way quantitative pump enters the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator. At the same time, the second electromagnetic cut-off valve is electrically connected, and the pressure oil in the rod chamber of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator flows back to the B oil port of the bidirectional quantitative pump. The flow of the two chambers of hydraulic cylinder 2 is asymmetrical, and the accumulator compensates the flow difference between the two chambers through the hydraulic control valve; at this time, the force generated by the rodless chamber of the hydraulic cylinder is greater than the force generated by the rod chamber. When the difference between the two chambers is greater than the load , the piston rods of hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator extend out at the same time; the displacement sensor on the hydraulic cylinder detects the displacement of the piston rod in real time and sends it to the controller; the controller combines the feedback command of the displacement sensor with the TRT The control command of the unit PLC is compared, and the difference is corrected by an algorithm and then output to the driver, so as to realize the closed-loop control of the position of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator, and accurately reach the expected extension position to ensure the TRT unit. The opening of the static leaf.

2. Under the normal operation state of the TRT unit, when the opening of the stator vane actuator decreases, the corresponding hydraulic cylinder piston rod retracts:

The controller receives the control command from the PLC of the TRT unit, and after calculation, sends a displacement retraction command to the driver. The driver drives the servo motor to rotate in reverse, and the servo motor drives the two-way quantitative pump to supply oil at B port and return oil at A port. The cut-off valve cuts off the oil circuit between the hydraulic cylinder 1 and the hydraulic cylinder 2 of the stationary vane actuator when the power is off; the second electromagnetic shut-off valve is powered on, and the pressure oil at the port B of the bidirectional quantitative pump enters the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator. The rod chamber of hydraulic cylinder two; at the same time, the first electromagnetic cut-off valve is electrically connected, and the pressure oil in the rodless chamber of hydraulic cylinder one and hydraulic cylinder two of the stationary vane actuator flows back to the A port of the two-way quantitative pump, due to the hydraulic pressure of the stationary vane actuator The two-chamber flow of cylinder 1 and hydraulic cylinder 2 is asymmetrical. Under the action of the pressure oil at port B of the bidirectional quantitative pump, the hydraulic control valve conducts, and the excess pressure in the rodless chamber of hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator The oil flows back to the accumulator through the hydraulic control valve; at this time, the force generated by the rod chambers of hydraulic cylinder 1 and hydraulic cylinder 2 is greater than the force generated by the rodless chamber. When the difference between the two chamber forces is greater than the load, the stationary vane actuator The piston rods of hydraulic cylinder 1 and hydraulic cylinder 2 retract at the same time; the displacement sensor on the hydraulic cylinder detects the retraction displacement of the piston rod in real time and sends it to the controller; the controller communicates the feedback command of the displacement sensor with the control command of the PLC of the TRT unit Compared, the difference is corrected by the algorithm and then output to the driver, so as to realize the closed-loop control of the position of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stator actuator, accurately reach the expected retracted position, and ensure the stator blade opening required by the TRT unit.

3. In the fault state of the TRT unit, the actuator of the stationary vane needs to maintain the current opening. At this time, the action process of the piston rods of hydraulic cylinder 1 and hydraulic cylinder 2:

The controller receives the stop command from the PLC of the TRT unit, sends a stop command to the driver to stop the rotation of the servo motor, the two-way quantitative pump maintains the current position, and the first electromagnetic shut-off valve, the second electromagnetic shut-off valve and the third electromagnetic shut-off valve lose power at the same time, and the static electricity is cut off. The hydraulic cylinder 1 and hydraulic cylinder 2 of the vane actuator and the oil circuit between the two chambers of the hydraulic cylinder and the ports A and B of the bidirectional quantitative pump. The hydraulic cylinder 1 and hydraulic cylinder 2 of the vane actuator maintain the current position. In this way, the function of the stator vane actuator to maintain the current stator vane opening in a fault state is realized.

4. In the maintenance state of the TRT unit, the position adjustment process of the piston rods of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator:

The controller receives the control command from the PLC of the TRT unit, and confirms that the stator blade actuator of the TRT unit can enter the maintenance state. The controller sends a shutdown command to the servo driver to stop the rotation of the servo motor, and at the same time controls the first electromagnetic shut-off valve and the second electromagnetic shut-off valve to lose power. , cut off the oil circuit between the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator and the oil ports A and B of the two-way quantitative pump, and control the third electromagnetic cut-off valve to conduct electricity to the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator The oil passage between the two cavities. At this time, the hydraulic cylinder 1 and the hydraulic cylinder 2 of the stationary vane actuator can realize the free extension or retraction of the hydraulic cylinder under a small external force, which is used for maintenance personnel to adjust the hydraulic cylinder. position or vane opening.

5. The safety protection process of hydraulic cylinder 1 and hydraulic cylinder 2 of stationary vane actuator:

The first pressure sensor detects the pressure value of the accumulator in real time. When the pressure value of the accumulator is lower than the set value of the controller, an alarm signal is sent to the PLC of the TRT unit to notify the maintenance personnel to overhaul the accumulator; the first The safety valve sets the maximum working pressure of the rodless cavity of hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator. When the working pressure of the rodless cavity is higher than the set pressure of the first safety valve, the pressure oil in the rodless cavity passes through the first The safety valve overflows to the accumulator; the second safety valve sets the maximum working pressure of the rod cavity of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator, when the working pressure of the rod cavity is higher than the set pressure of the second safety valve , the pressure oil in the rod cavity overflows to the accumulator through the second safety valve; when the pressure in both chambers of hydraulic cylinder 1 and hydraulic cylinder 2 of the vane actuator does not exceed the set pressure of the safety valve, the controller accepts The limit value of the output command of the TRT unit PLC, and calculate the real-time pressure values detected by the second pressure sensor and the third pressure sensor of the hydraulic cylinder 1 and hydraulic cylinder 2 of the stationary vane actuator. If the calculated piston rod output is less than the output command Limit value, the controller sends an extension or retraction displacement command to the driver, and the driver drives the servo motor to rotate in the forward or reverse direction. The position closed-loop control of hydraulic cylinder 2 can accurately reach the expected position and ensure the opening of the stator vane required by the TRT unit; if the calculated piston rod output is greater than the output command limit, the controller sends a torque control command to the driver, through the driver Control the torque of the servo motor to control the pressure of the port A or port B of the two-way quantitative pump until the calculated piston rod output is less than the output command limit of the TRT unit PLC; thus realizing the safety protection of the stator actuator and ensuring the stability of the TRT unit run.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.

Claims (7)

1. a kind of trt unit stator blade direct drive type electrohydraulic servo-control system, includes stator blade executing agency, direct drive type electrohydraulic servo Mechanism, the first electromagnetic shut-off valve (9) and the second electromagnetic shut-off valve (10), stator blade executing agency is by hydraulic cylinder one (15.1), hydraulic pressure Cylinder two (15.2) and static blade angle guiding mechanism (15.3) composition, direct drive type electrohydraulic servo control mechanism is by servomotor (1) and two-way Constant displacement pump (2) composition it is characterised in that: servomotor is connected to two-way quantitative pump, its rotate forward drive two-way quantitative pump a hydraulic fluid port supply Oil, b hydraulic fluid port oil return, its reversion drives two-way quantitative pump b hydraulic fluid port fuel feeding, a hydraulic fluid port oil return；Two-way quantitative pump a hydraulic fluid port is via first Electromagnetic shut-off valve is connected jointly with the rodless cavity of hydraulic cylinder one, hydraulic cylinder two, and b hydraulic fluid port is via the second electromagnetic shut-off valve and hydraulic cylinder First, the rod chamber of hydraulic cylinder two connects jointly；First electromagnetic shut-off valve, the second electromagnetic shut-off valve make oil circuit under obtaining electricity condition Conducting, achievable hydraulic cylinder one, the position closed loop motion control of hydraulic cylinder two, it makes oil circuit cut off under power failure state, can The current location off-position realizing static blade angle guiding mechanism controls.

2. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 1 it is characterised in that: also include There are pilot operated valve device (3), check valve (4) and accumulator (6), accumulator is connected by pilot operated valve device with a hydraulic fluid port of two-way quantitative pump, and double Connected by check valve to the b hydraulic fluid port of constant displacement pump, be also directly connected to the 3rd hydraulic fluid port of two-way quantitative pump.

3. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 2 it is characterised in that: also include There are the first safety valve (7), the second safety valve (8), accumulator and hydraulic cylinder one, the rodless cavity of hydraulic cylinder two are all by the first safety Valve connects, and is all connected by the second safety valve with the rod chamber of hydraulic cylinder one, hydraulic cylinder two.

4. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 2 it is characterised in that: also include There is first pressure sensor (5), first pressure sensor is arranged on accumulator oil circuit.

5. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 1 it is characterised in that: also include There is the 3rd electromagnetic shut-off valve (11), hydraulic cylinder one, the rod chamber of hydraulic cylinder two and rodless cavity are all by the 3rd electromagnetic shut-off valve even Connect, under obtaining electricity condition, the current location of achievable static blade angle guiding mechanism adjusts the 3rd electromagnetic shut-off valve, and it is in dead electricity shape Connection cut-out under state, between achievable hydraulic cylinder one, the rod chamber of hydraulic cylinder two and rodless cavity.

6. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 1 it is characterised in that: also include There are second pressure sensor (12) and the 3rd pressure sensor (13), second pressure sensor is in hydraulic cylinder one, hydraulic cylinder two Arrange on rodless cavity oil circuit, the 3rd pressure sensor is arranged on hydraulic cylinder one, the rod chamber oil circuit of hydraulic cylinder two.

7. trt unit stator blade direct drive type electrohydraulic servo-control system according to claim 1 it is characterised in that: also include There is displacement transducer (14), displacement transducer is arranged on hydraulic cylinder one or hydraulic cylinder two.