Start-stop simulation device and test method for imported guide vane electro-hydraulic servo system

Abstract

This invention belongs to the field of automatic control of gas turbine inlet guide vanes, and discloses a simulation device and testing method for the start-stop of an electro-hydraulic servo system for inlet guide vanes. The device includes an electrical control cabinet, with a simulation platform and an electro-hydraulic servo device on its upper surface. The electro-hydraulic servo device includes a base and a servo hydraulic cylinder. The base is fixed to the electrical control cabinet, and the servo hydraulic cylinder is mounted on the base. The simulation platform includes a housing, with a rotating platform installed inside the housing. The rotating platform's rotating chassis is mounted on the upper surface of the housing. The rotating platform has a linear slide. A servo motor control system and an electro-hydraulic servo system are installed inside the electrical control cabinet. The servo motor control system controls the drive motor of the rotating platform, and the electro-hydraulic servo system controls the servo hydraulic cylinder to achieve reciprocating motion. The servo hydraulic cylinder provides power to the entire device. This invention can be used for optimizing the installation angle of the servo hydraulic cylinder, testing the extreme off-center load life of the servo hydraulic cylinder, and calibrating the service performance and parameters of the electro-hydraulic servo system.

Description

Technical Field

[0001] This invention belongs to the field of automatic control of gas turbine inlet guide vanes, and particularly relates to a start-stop simulation device and test method for an electro-hydraulic servo system for inlet guide vanes. Background Technology

[0002] In actual use, IGV systems are susceptible to interference and jamming in rotating joints due to temperature and airflow, leading to blade opening or closing failures. If the electro-hydraulic servo system remains operational during these conditions, it will damage the blade transmission structure, causing serious consequences. Currently, most gas turbine inlet guide vane systems use hydraulic servo actuators to control the piston rod, rotating the drive ring to open, close, and adjust the guide vane angle. However, because the linear stroke of the servo actuator piston rod is converted into the circular motion of the drive ring, the connecting rod will inevitably form an angle with the piston rod. This causes the piston rod to experience a vertical axial force, resulting in an off-center load. The electro-hydraulic servo control system cannot respond promptly enough to ensure the inlet guide vane deflection angle reaches the preset value, leading to unit startup failure or other malfunctions and significant economic losses. Therefore, it is essential to conduct start-stop simulation tests on the inlet guide vane electro-hydraulic servo system to assess its positioning accuracy and response time, ensuring stable system operation.

[0003] For example, patent application number CN201910574032.5 discloses a test bench for testing the anti-eccentric load capacity of a hydrostatic bearing hydraulic cylinder, in order to detect the anti-eccentric load performance of a small hydraulic cylinder under different eccentric load capacities. However, the magnitude of the eccentric load force generated by the above test device is entirely determined by the gap between the guide rail and the slider, and has no direct relationship with the pressure provided by the load hydraulic cylinder. It is impossible to quantitatively analyze the correlation between the magnitude of the eccentric load force and the magnitude of the eccentric load angle and the service performance of the servo hydraulic cylinder, and it cannot provide reasonable suggestions for the installation angle of the servo hydraulic cylinder under eccentric load conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a start-stop simulation device and testing method for an imported guide vane electro-hydraulic servo system, in order to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the specific technical solution of the present invention, a start-stop simulation device and testing method for an imported guide vane electro-hydraulic servo system, is as follows:

[0006] An imported guide vane electro-hydraulic servo system start-stop simulation device includes an electrical control cabinet. The upper surface of the control cabinet has a simulation platform and an electro-hydraulic servo device. The electro-hydraulic servo device includes a base, a servo hydraulic cylinder, and a support. The base is fixedly installed on the control cabinet, and the servo hydraulic cylinder is horizontally installed on the base. The servo hydraulic cylinder is fixedly connected to the upper surface of the base via the support. The simulation platform includes a housing, a rotating platform installed inside the housing, and a rotating chassis of the rotating platform installed on the upper surface of the housing. A linear slide is fixedly installed on the rotating platform. The control cabinet houses a servo motor control system and an electro-hydraulic servo system. The servo motor control system controls the drive motor of the rotating platform, and the electro-hydraulic servo system controls the servo hydraulic cylinder to achieve reciprocating motion. The servo hydraulic cylinder provides power to the entire device.

[0007] Furthermore, it includes a button box and a display. The button box is used to control the start and stop of the servo motor control system and the electro-hydraulic servo system, and the display is used to show the operating status and parameters of the device.

[0008] Furthermore, the outer casing is equipped with fences on both sides; the electromagnetic brake is installed below the linear slide transition plate.

[0009] Furthermore, the rotating platform includes a rotating chassis, a fixed frame, a drive motor, a worm gear reducer, and laser sensors. The drive motor and the worm gear reducer are fixedly installed within the fixed frame. The output shaft of the drive motor is connected to the worm of the worm gear reducer via a coupling, and the output shaft of the worm gear reducer is connected to the rotating chassis via a keyway. The rotating chassis is fixedly connected to the linear slide. Multiple laser sensors are installed around the fixed frame for positioning the linear slide.

[0010] Furthermore, the linear slide includes a base plate, linear guide rails, sliders, and a connecting plate; the linear guide rails are installed parallel to each other on both sides of the base plate, and two sliders are respectively arranged on the linear guide rails on both sides. The connecting plate is fixedly connected to the two sliders, and the connecting plate and the linear guide rails form a sliding pair.

[0011] Furthermore, limit blocks are installed at both ends of the linear guide rail.

[0012] Furthermore, the linear slide includes an electromagnetic brake, which is divided into upper and lower parts. The lower part is fixedly installed in the groove of the base plate, and the upper part is fixedly connected to the connecting plate. When it is working, the upper part generates a magnetic force to attract the lower part, which can increase the sliding resistance of the connecting plate.

[0013] Furthermore, the front end of the connecting rod is connected to the connecting plate using a cylindrical pin, and the rear end is connected to the piston rod of the servo hydraulic cylinder using a pin. A tension / compression sensor is installed at the rear end of the connecting rod. The base plate is embedded in the groove of the rotating chassis of the rotating platform, and the rotation of the rotating chassis can change the angle of the linear slide. This invention also discloses a start-stop simulation test method for an imported guide vane electro-hydraulic servo system, comprising the following steps:

[0014] Step 1: Start the servo motor control system and control the rotation angle of the linear slide according to the test requirements until the connecting rod and the piston rod of the servo hydraulic cylinder are collinear. At this time, the off-center loading angle between the connecting rod and the piston rod of the servo hydraulic cylinder is 0°.

[0015] Step 2: Start the electro-hydraulic servo system to be tested and test whether the electro-hydraulic servo system can be turned on correctly. Control the electro-hydraulic servo valve through the electro-hydraulic servo system to adjust the system pressure of the hydraulic circuit and realize the reciprocating motion of the piston rod. Control the flow of the hydraulic system to control the constant speed of the piston rod. Feedback on displacement changes is obtained through the displacement sensor under the servo hydraulic cylinder.

[0016] Step 3: Reset the device, close the electromagnetic brake to make the sliding resistance of the connecting plate zero; start the servo motor control system, control the rotation angle of the linear slide to make the connecting rod and the piston rod of the servo hydraulic cylinder at the actual installation angle θ in the device; turn on the electro-hydraulic servo system under test to drive the piston rod of the servo hydraulic cylinder to move; the tension and compression sensor collects the piston rod thrust; the displacement sensor near the slider collects the slider displacement curve; the off-center load of the servo hydraulic cylinder is W, as shown in the following formula:

[0017] W = P s ×A b ×K

[0018]

[0019] In the formula P s For the servo hydraulic cylinder 7, supply oil pressure, A b Where K is the effective bearing area of ​​the oil cavity, K is the off-center load coefficient, and λ is the hydraulic oil resistance ratio (λ < 1).

[0020] Step 4: Reset the device, open the electromagnetic brake to a resistance of F, start the servo motor control system, control the rotation angle of the linear slide to make the connecting rod and the piston rod of the servo hydraulic cylinder at the actual installation angle θ in the device, start the electro-hydraulic servo system under test, drive the piston rod of the servo hydraulic cylinder to move, and observe the response and adjustment capability of the electro-hydraulic servo system. The resistance F of the electromagnetic brake can be calculated by the following formula:

[0021]

[0022] In the formula, F is the oil supply pressure of the servo hydraulic cylinder, I is the current intensity, η is a constant, and μ lL is the magnetic flux. m The width of the slot for the electromagnetic brake;

[0023] Step 5: Reset the device, activate the electromagnetic brake, set the resistance to the limit off-center load bearing capacity of the servo hydraulic cylinder, activate the electro-hydraulic servo system to be tested, drive the piston rod of the servo hydraulic cylinder to move, and test whether the safety protection mechanism of the electro-hydraulic servo system is activated, that is, whether it will automatically stop after the resistance value exceeds the limit off-center load bearing capacity of the servo hydraulic cylinder.

[0024] Furthermore, the safety protection mechanism in step 5 includes automatic shutdown after the resistance value exceeds the limit of the servo hydraulic cylinder's off-center load bearing capacity; and forced shutdown when the difference between the displacement command sending time and the actual displacement arrival time exceeds a set threshold, i.e., forced shutdown is required when the displacement sensor response curve is abnormal.

[0025] The present invention provides a start-stop simulation device and testing method for an imported guide vane electro-hydraulic servo system, which has the following advantages: The present invention is a testing device and method for specifically testing the anti-eccentric load performance of servo hydraulic cylinders and electro-hydraulic servo control systems, and for visualizing the test results. This device can be used for optimizing the installation angle of servo hydraulic cylinders, testing the ultimate eccentric load life of servo hydraulic cylinders, and calibrating the service performance and parameters of electro-hydraulic servo systems. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the start-stop simulation device for the electro-hydraulic servo system of the imported guide vane of the present invention;

[0027] Figure 2 This is a schematic diagram of the rotating platform module structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the linear slide module structure of the present invention;

[0029] Explanation of markings in the diagram: 1. Outer shell; 4. Fence; 5. Connecting rod; 6. Base; 7. Servo hydraulic cylinder; 8. Support; 9. Electrical control cabinet; 10. Display; 11. Button box; 12. Piston rod; 200. Rotating platform; 201. Rotating chassis; 202. Fixed frame; 203. Drive motor; 204. Worm gear reducer; 205. Laser sensor; 300. Linear slide; 301. Base plate; 302. Limit block; 303. Linear guide rail; 304. Electromagnetic brake; 305. Slider; 306. Connecting plate. Detailed Implementation

[0030] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides a starting and stopping simulation device and testing method for an imported guide vane electro-hydraulic servo system.

[0031] like Figure 1As shown, an imported guide vane electro-hydraulic servo system start-stop simulation device includes an electrical control cabinet 9. The upper surface of the electrical control cabinet 9 has a simulation platform, an electro-hydraulic servo device, a button box 11, and a display 10. The electro-hydraulic servo device includes a base 6, a servo hydraulic cylinder 7, and a support 8. The base 6 is fixedly mounted on the electrical control cabinet 9, and the servo hydraulic cylinder 7 is horizontally mounted on the base 6. The servo hydraulic cylinder 7 is fixedly connected to the upper surface of the base 6 via the support 8. The simulation platform includes a housing 1, a rotating platform 200 installed inside the housing 1, and a rotating chassis 201 of the rotating platform 200 mounted on the upper surface of the housing 1. A linear slide 300 is fixedly mounted on the rotating platform 200. The rotating platform 200 is used to rotate the linear slide 300, changing the off-center load angle for testing. The linear slide 300 is used to simulate the movement of the adjustable guide vane drive ring in the actual structure. Grilles 4 are installed on both sides of the housing 1. The electrical control cabinet 9 houses a servo motor control system and an electro-hydraulic servo system. The servo motor control system controls the drive motor 203 of the rotary platform 200, while the electro-hydraulic servo system controls the servo hydraulic cylinder 7 to achieve reciprocating motion. The servo hydraulic cylinder 7 provides power to the entire device. The button box 11 controls the start and stop of the servo motor control system and the electro-hydraulic servo system. The display 10 shows the device's operating status and parameters. An electromagnetic brake is installed below the adapter plate of the linear slide 300, providing sliding resistance to the slider during movement when activated, simulating fault conditions.

[0032] like Figure 2 As shown, the rotary platform 200 includes a rotary chassis 201, a fixed frame 202, a drive motor 203, a worm gear reducer 204, and laser sensors 205. The drive motor 203 and the worm gear reducer 204 are fixedly installed inside the fixed frame 202. The output shaft of the drive motor 203 is connected to the worm of the worm gear reducer 204 via a coupling. The output shaft of the worm gear reducer is connected to the rotary chassis 201 via a keyway. The rotary chassis 201 is fixedly connected to the linear slide 300. Six laser sensors 205 are installed around the fixed frame 202 for positioning the linear slide 300.

[0033] like Figure 3 As shown, the linear slide 300 includes a base plate 301, a limiting block 302, a linear guide rail 303, an electromagnetic brake 304, sliders 305, and a connecting plate 306. The linear guide rails 303 are bolted parallel to both sides of the base plate 301. Two sliders 305 are respectively mounted on each side of the linear guide rail 303, and limiting blocks 302 are installed at both ends of the linear guide rails 303. The connecting plate 306 is fixedly connected to the two sliders 305, forming a sliding pair with the linear guide rails 303. The electromagnetic brake 304 consists of upper and lower parts. The lower part is fixedly installed in a groove in the base plate 301, and the upper part is fixedly connected to the connecting plate 306. When it operates, the upper part generates a magnetic force that attracts the lower part, increasing the sliding resistance of the connecting plate 306. Figure 1As shown, the front end of the connecting rod 5 is connected to the connecting plate 306 by a cylindrical pin, and the rear end is connected to the piston rod 12 of the servo hydraulic cylinder 7 by a pin. A tension / compression sensor is installed at the rear end of the connecting rod 5. The base plate 301 is embedded in the groove of the rotating chassis 201 of the rotating platform 200. The rotation of the rotating chassis 201 can change the angle of the linear slide 300.

[0034] The specific steps of the reliability simulation test method for an imported guide vane electro-hydraulic servo system according to the present invention are as follows:

[0035] 1. Press the start button on button box 11 to start the servo motor control system. Control the rotation angle of linear slide 300 according to the test requirements until the connecting rod 5 and the piston rod 12 of servo hydraulic cylinder 7 are collinear. At this time, the off-center loading angle between the connecting rod 5 and the piston rod 12 of servo hydraulic cylinder 7 is 0°.

[0036] 2. Start the electro-hydraulic servo system to be tested and test whether the electro-hydraulic servo system can be turned on correctly. Control the electro-hydraulic servo valve through the electro-hydraulic servo system to adjust the system pressure of the hydraulic circuit and realize the reciprocating motion of the piston rod 12. Control the flow of the hydraulic system to control the constant speed of the piston rod 12. The displacement change is fed back by the displacement sensor under the servo hydraulic cylinder 7.

[0037] 3. Reset the device, close the electromagnetic brake, and make the sliding resistance of the connecting plate 306 zero. Start the servo motor control system, control the linear slide 300 to rotate so that the connecting rod 5 and the piston rod 12 of the servo hydraulic cylinder 7 are at the actual installation angle θ (example θ = 17°). Turn on the electro-hydraulic servo system under test, drive the piston rod 12 of the servo hydraulic cylinder 7 to move, the tension sensor collects the thrust of the piston rod 12, and the displacement sensor near the slider 305 collects the displacement curve of the slider 305. The off-center load force of the servo hydraulic cylinder 7 is W, as shown in the following formula:

[0038] W = P s ×A b ×K

[0039]

[0040] In the formula P s For the servo hydraulic cylinder 7, supply oil pressure, A b Where K is the effective bearing area of ​​the oil cavity, K is the off-center load coefficient, and λ is the hydraulic oil resistance ratio (λ < 1).

[0041] 4. Reset the device and open the electromagnetic brake until the resistance is F. Start the servo motor control system and control the linear slide 300° to rotate the connecting rod 5 and the piston rod 12 of the servo hydraulic cylinder 7 to the actual installation angle θ (example θ = 17°). Start the electro-hydraulic servo system under test, driving the piston rod 12 of the servo hydraulic cylinder 7 to move. Observe the response and adjustment capability of the electro-hydraulic servo system. The resistance F of the electromagnetic brake can be calculated by the following formula:

[0042]

[0043] In the formula, F is the oil supply pressure of the servo hydraulic cylinder 7, I is the current intensity, η is a constant, and μ l L is the magnetic flux. m This refers to the width of the slot in the electromagnetic brake.

[0044] 5. Reset the device, activate the electromagnetic brake, set the resistance to the limit off-center load bearing capacity of the servo hydraulic cylinder, activate the electro-hydraulic servo system to be tested, drive the piston rod 12 of the servo hydraulic cylinder 7 to move, and test whether the safety protection mechanism of the electro-hydraulic servo system is activated (the safety protection mechanism includes 1. automatic shutdown after the resistance value exceeds the limit off-center load bearing capacity of the servo hydraulic cylinder 7; 2. forced shutdown when the difference between the displacement command sending time and the actual displacement arrival time exceeds the set threshold, i.e., forced shutdown is required when the displacement sensor response curve is abnormal).

[0045] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A start-stop simulation device for an imported guide vane electro-hydraulic servo system, comprising an electrical control cabinet (9), the upper surface of which has a simulation platform and an electro-hydraulic servo device; characterized in that, The electro-hydraulic servo device includes a base (6), a servo hydraulic cylinder (7), and a support (8); the base (6) is fixedly installed on the electrical control cabinet (9), the servo hydraulic cylinder (7) is horizontally installed on the base (6), and the servo hydraulic cylinder (7) is fixedly connected to the upper surface of the base (6) through the support (8); the simulation platform includes a shell (1), a rotating platform (200) is installed inside the shell (1), the rotating chassis (201) of the rotating platform (200) is installed on the upper surface of the shell (1), a linear slide (300) is fixedly installed on the rotating platform (200), and a servo motor control system and an electro-hydraulic servo system are installed inside the electrical control cabinet (9). The servo motor control system is used to control the drive motor (203) of the rotary platform (200), and the electro-hydraulic servo system is used to control the servo hydraulic cylinder (7) to achieve reciprocating motion. The linear slide (300) includes a base plate (301), a linear guide rail (303), a slider (305), and a connecting plate (306). The linear guide rail (303) is installed parallel to both sides of the base plate (301), and two sliders (305) are respectively arranged on the linear guide rail (303) on both sides. The connecting plate (306) is fixedly connected to the two sliders (305), and the connecting plate (306) and the linear guide rail (303) form a sliding pair. The slide (300) includes an electromagnetic brake (304), which is divided into upper and lower parts. The lower part is fixedly installed in the groove of the base plate (301), and the upper part is fixedly connected to the connecting plate (306). When it works, the upper part generates a magnetic force to attract the lower part, which can increase the sliding resistance of the connecting plate (306). The front end of the connecting rod (5) is connected to the connecting plate (306) by a cylindrical pin, and the rear end is connected to the piston rod (12) of the servo hydraulic cylinder (7) by a pin. A tension and compression sensor is installed at the rear end of the connecting rod (5). The base plate (301) is embedded in the groove of the rotating chassis (201) of the rotating platform (200). The rotation of the rotating chassis (201) can change the angle of the linear slide (300). When the electromagnetic brake is closed, the sliding resistance of the connecting plate (306) is 0. The servo motor control system is started, and the rotation angle of the linear slide (300) is controlled so that the connecting rod (5) and the piston rod (12) of the servo hydraulic cylinder (7) are at the installation angle θ in the actual device. The electro-hydraulic servo system under test is turned on, and the piston rod (12) of the servo hydraulic cylinder (7) is driven to move. The tension and compression sensor collects the thrust of the piston rod (12), and the displacement sensor near the slider (305) collects the displacement curve of the slider (305). At this time, the off-center load of the servo hydraulic cylinder (7) is W, as shown in the following formula: W=P s ×A b ×K; ； In the formula P s For the servo hydraulic cylinder (7), supply oil pressure, A b Where K is the effective bearing area of ​​the oil cavity, K is the off-center load coefficient, and λ is the hydraulic oil resistance ratio, where λ < 1.

2. The start / stop simulation device for the electro-hydraulic servo system of the imported guide vane according to claim 1, characterized in that, It includes a button box (11) and a display (10). The button box (11) is used to control the start and stop of the servo motor control system and the electro-hydraulic servo system, and the display (10) is used to display the operating status and parameters of the device.

3. The start / stop simulation device for the electro-hydraulic servo system of the imported guide vane according to claim 1, characterized in that, The outer shell (1) is equipped with fences (4) on both sides.

4. The start / stop simulation device for the electro-hydraulic servo system of the imported guide vane according to claim 1, characterized in that, The rotating platform (200) includes a rotating chassis (201), a fixed frame (202), a drive motor (203), a worm gear reducer (204), and a laser sensor (205). The drive motor (203) and the worm gear reducer (204) are fixedly installed in the fixed frame (202). The output shaft of the drive motor (203) is connected to the worm of the worm gear reducer (204) through a coupling. The worm gear output shaft is connected to the rotating chassis (201) through a keyway. The rotating chassis (201) is fixedly connected to the linear slide (300). Multiple laser sensors (205) are installed around the fixed frame (202) for positioning the linear slide (300).

5. The start / stop simulation device for the electro-hydraulic servo system of the imported guide vane according to claim 1, characterized in that, Limiting blocks (302) are installed at both ends of the linear guide (303).

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