CN109404364B - Servo valve detection method - Google Patents

Servo valve detection method Download PDF

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Publication number
CN109404364B
CN109404364B CN201811361486.6A CN201811361486A CN109404364B CN 109404364 B CN109404364 B CN 109404364B CN 201811361486 A CN201811361486 A CN 201811361486A CN 109404364 B CN109404364 B CN 109404364B
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servo valve
rocker arm
fixed seat
eccentric sleeve
arm rod
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CN201811361486.6A
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Chinese (zh)
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CN109404364A (en
Inventor
刘航
孔立军
朱天辉
李兴丽
李胜国
刘强
刘晓杰
韩勇
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No 5721 Factory of PLA
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No 5721 Factory of PLA
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for

Abstract

A servo valve detection method belongs to the technical field of testing and measuring. The adopted servo valve detection device comprises a rocker arm rod, a rotating shaft, a measuring rod, an eccentric sleeve, a displacement display screen and a fixed seat; the fixed seat is arranged on the servo valve fault detection test bed, is of an L-shaped structure, is provided with a rocker arm rod on the horizontal wall and is provided with an eccentric sleeve on the vertical wall; the middle part of the rocker arm rod is hinged with the horizontal wall of the fixed seat through a rotating shaft, and the lower end of the rocker arm rod is provided with a measuring head; one end of the measuring rod is a contact which is contacted with the upper end of the rocker arm rod, the other end of the measuring rod is connected with the displacement display screen, and the measuring rod is arranged on the fixed seat through an eccentric sleeve; the eccentric sleeve is assembled with an eccentric sleeve assembling hole arranged on the vertical wall of the fixed seat. The invention realizes the detection of the performance of the servo valve fault detector in the servo actuator of the aircraft and achieves the purposes of ensuring the reliability of the measurement result and the safe flight of the aircraft.

Description

Servo valve detection method
Technical Field
The invention relates to a hydraulic valve detection device and a detection method, in particular to a detection device and a detection method for a servo valve of a servo valve fault detector in an aircraft servo actuator, and belongs to the technical field of testing and measuring.
Background
Under the normal condition, the output pressures of two cavities of a servo valve in an aircraft servo actuator are equal, a servo valve core of the fault detector compresses a valve core spring under the action of the output oil pressure, so that the valve core is in a middle position, and the fault detector is in a normal working state. When the pressures output by the two cavities of the single-stage servo valves on the two sides are unequal and exceed the pressure threshold value of the fault detector or the servo valves have faults, the valve cores in the servo valve assemblies deviate from the middle position, so that the rocker arms of the aircraft fault detector are driven to swing, the micro switches are switched off, and fault reporting (fault alarm) is realized, namely the fault reporting working principle of the aircraft fault detector. In addition, because the detection head of the rocker arm rod has high precision and is a part easy to wear, the rocker arm rod needs to be adjusted during detection operation so as to ensure reliable precision.
Disclosure of Invention
The invention provides a servo valve detection device and a detection method, and aims to realize the detection of the performance of a servo valve fault detector in an aircraft servo actuator and achieve the purposes of ensuring the reliability of a measurement result and ensuring the safe flight of an aircraft.
In order to achieve the purpose, the invention adopts the following technical scheme:
a servo valve detection device comprises a rocker arm rod, a rotating shaft, a measuring rod, an eccentric sleeve, a displacement display screen and a fixed seat; the fixed seat is arranged on the servo valve fault detection test bed, is of an L-shaped structure, is provided with a rocker arm rod on the horizontal wall and is provided with an eccentric sleeve on the vertical wall; two sides of the upper end of the rocker arm rod are processed into planes, the middle part of the rocker arm rod is hinged with the horizontal wall of the fixed seat through a rotating shaft, and the lower end of the rocker arm rod is provided with a measuring head; one end of the measuring rod is a contact which is in plane contact with the upper end side of the rocker arm rod, the other end of the measuring rod is connected with the displacement display screen, and the measuring rod is installed on the fixed seat through an eccentric sleeve; the eccentric sleeve is assembled with an eccentric sleeve assembling hole arranged on the vertical wall of the fixed seat.
According to the servo valve detection device, the fixing seat is provided with the notch which is communicated with the eccentric sleeve assembling hole, the notch is provided with the locking hole, and the locking nail is assembled in the locking hole.
In the servo valve detection device, the deviation value L = 0.25mm between the inner hole of the eccentric sleeve and the central axis of the outer cylindrical surface of the eccentric sleeve.
According to the servo valve detection device, one end of the eccentric sleeve is provided with the rotary operating handle.
According to the servo valve detection device, the fixing seat is fixed on the servo valve detection test bed through the set of screws.
A servo valve detection method adopts the servo valve detection device to complete detection of performance of a servo valve fault detector in an aircraft servo actuator, and comprises the following operation steps:
a. assembling a servo valve detection device: the fixed seat is arranged on the servo valve detection test bed, a rocker arm rod is assembled on the horizontal wall of the fixed seat, the rocker arm rod is hinged with the horizontal wall of the fixed seat through a rotating shaft, the locking nail is unscrewed, the eccentric sleeve and the measuring rod are sleeved and then placed in the eccentric sleeve assembling hole of the vertical wall of the fixed seat, and the measuring rod is connected with the displacement display screen through a lead;
b. zero debugging: selecting a standard servo valve, connecting the standard servo valve in a hydraulic oil circuit, placing a measuring head at the lower end of a rocker arm rod in the middle position of the standard servo valve, controlling the oil pressure in the hydraulic oil circuit to be a set value, enabling the standard servo valve to be in a working state, moving a valve core of the standard servo valve to a middle position, pushing the rocker arm rod to rotate around a rotating shaft for a certain angle, then rotating an eccentric sleeve to drive a measuring rod to rotate, moving a central axis of the measuring rod up and down, stopping rotating the eccentric sleeve when the number indicated by a displacement display screen is zero, and screwing a locking nail to fix the eccentric sleeve;
c. workpiece installation: the method comprises the following steps that a standard servo valve is detached from a hydraulic oil circuit, a detected servo valve is connected into the hydraulic oil circuit, and a measuring head at the lower end of a rocker arm rod is arranged in the middle of the detected servo valve;
d. and (3) detection: the hydraulic oil circuit is communicated, the servo valve to be detected is in a working state, the valve core moves towards the middle position, the rocker arm rod is pushed to rotate for a certain angle around the rotating shaft, the measuring rod contact in contact with the upper end of the rocker arm rod moves for a certain distance leftwards and rightwards, the numerical value displayed on the displacement display screen is the measured value of the distance of the valve core of the servo valve deviating from the middle position at the moment, the oil pressure in the hydraulic oil circuit is adjusted, and the numerical value displayed on the displacement display screen is;
e. judging whether the servo valve is qualified: and observing and recording the numerical value of a pressure gauge in the hydraulic oil circuit, comparing the numerical value of the pressure gauge with the pressure value of the hydraulic oil circuit set by the standard, and judging whether the servo valve is qualified.
In the servo valve detection method, in the step e, when the numerical value of the pressure gauge exceeds the range of the standard set value, the detected servo valve is judged not to meet the requirement; and when the numerical value of the pressure gauge is in the range of the standard set value, judging that the detected servo valve meets the requirement.
The servo valve detection device can transmit the displacement of the valve core of the servo valve to the contact of the measuring rod through the rocker arm rod, and then the displacement display screen connected with the measuring rod displays the displacement value of the valve core of the servo valve, but the measuring head of the rocker arm rod is worn after being used for a certain time, so that the reliability of the measuring result is influenced, particularly when the offset of the valve core is close to a critical value, misjudgment is easy to generate, and expensive components are scrapped, so that the rocker arm rod needs to be replaced in time, the rocker arm rod has high requirements on the aspects of symmetry, jitter, position degree, size precision, surface roughness and the like, and processing errors cannot be avoided, so that the measured reference position is difficult to be accurately positioned even if a new rocker arm rod is adopted. The servo valve detection device is provided with the eccentric sleeve, and the contact position of the contact of the measuring rod and the rocker arm rod can be adjusted through the eccentric sleeve, so that the positioning requirement of the reference position is met.
The servo valve detection method comprises the steps of firstly rotating an eccentric sleeve when a valve core of a standard servo valve is in a middle position to enable the display number of a displacement display screen to be zero, determining the position of a contact of a measuring rod at the moment to be a reference zero position, fixing the eccentric sleeve through a locking nail, then controlling the distance of the valve core of the servo valve from the center position by adjusting the oil pressure of a test oil way to enable the display number of the displacement display screen to be a set value, reading the value of a pressure gauge in the measuring oil way, and comparing the value with the standard set value to judge whether the servo valve is qualified or not.
In conclusion, the invention realizes the detection of the performance of the servo valve fault detector in the aircraft servo actuator, and achieves the purposes of ensuring the reliability of the measurement result and the safe flight of the aircraft.
Drawings
FIG. 1 is a schematic diagram of a servo valve detection apparatus according to the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of a fixing base;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a schematic view of an eccentric bushing configuration;
FIG. 6 is a schematic view of the cross-sectional structure A-A of FIG. 5;
FIG. 7 is a schematic view of the servo valve detecting device in an operating state;
FIG. 8 is a schematic diagram of a servo valve failure detection principle.
The list of labels in the figure is: 1. the device comprises a valve core, 2 parts of a rocker arm rod, 2-1 parts of a measuring head, 3 parts of a rotating shaft, 4 parts of a screw, 5 parts of a fixed seat, 5-1 parts of an eccentric sleeve matching hole, 5-2 parts of a notch, 5-3 parts of a locking hole, 6 parts of an eccentric sleeve, 6-1 parts of a rotating operation handle, 7 parts of a measuring rod, 8 parts of a displacement display screen, 9 parts of a locking nail.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Referring to fig. 1, 2, 3 and 4, the servo valve detection device of the invention comprises a rocker arm rod 2, a rotating shaft 3, a measuring rod 7, an eccentric sleeve 6, a displacement display screen 8 and a fixed seat 5; the fixed seat 5 is arranged on the servo valve fault detection test bed, the fixed seat 5 is of an L-shaped structure, a rocker arm rod 2 is assembled on the horizontal wall of the fixed seat 5, and an eccentric sleeve 6 is assembled on the vertical wall of the fixed seat; the middle part of the rocker arm rod 2 is hinged with the horizontal wall of the fixed seat 5 through a rotating shaft 3, and the lower end of the rocker arm rod 2 is provided with a measuring head 2-1; one end of the measuring rod 7 is a contact which is in plane contact with the upper end side of the rocker arm rod 2, the other end of the measuring rod is connected with the displacement display screen 8, and the measuring rod 7 is installed on the fixed seat 5 through the eccentric sleeve 6; the eccentric sleeve 6 is assembled with an eccentric sleeve assembling hole 5-1 arranged on the vertical wall of the fixed seat 5.
Referring to fig. 3 and 4, in the servo valve detection device of the invention, a fixed seat 5 is provided with a notch 5-2 communicated with an eccentric sleeve assembling hole 5-1, a locking hole 5-3 is arranged at the position of the notch 5-2, and a locking nail 9 is assembled in the locking hole 5-3.
Referring to fig. 5 and 6, in the servo valve detection device of the invention, the deviation value L = 0.25mm between the central axis of the inner hole of the eccentric sleeve 6 and the outer cylindrical surface thereof; one end of the eccentric sleeve 6 is provided with a rotary operating handle 6-1.
Referring to fig. 7 and 8, the working principle of the servo valve detection device of the invention is as follows: a rocker arm rod 2 of the servo valve detection device can rotate around a rotating shaft 3, the center of the rotating shaft 3 is set to be an O point, a contact point of a contact of the rocker arm rod 2 and a measuring rod 7 is a B point, a contact point of a measuring head of the rocker arm rod 2 and a valve core is an A point, and OA = OB is enabled; when the pressures output by the two cavities of the servo valve are unequal, the valve core 1 of the servo valve deviates from a middle zero point, the deviation amount is AA 1, the rocker arm rod 2 rotates to form an upper triangle OAA 1 and a lower triangle OBB 1, the AA 1 is BB 1, the displayed value BB 1 of the displacement display screen 8 is the value AA 1 of the valve core 1 deviating from the middle zero point, and the value of the valve core 1 deviating from the middle zero point is not larger than a set value according to the related technical requirements; however, since the measuring head of the above-mentioned fault detector rocker arm 2 is worn out after a certain period of use, resulting in OA < OB, AA 1 < BB 1, namely, the display value of the displacement display screen 8 is larger than the value of the valve core 1 deviating from the neutral zero point, particularly when the valve core 1 deviates to the critical state, the misjudgment is easy to occur, the expensive components are discarded, therefore, the rocker arm rod 2 is replaced by a new rocker arm rod in time, the rocker arm rod 2 has high requirements on symmetry, jumping degree, position degree, size precision, surface roughness and the like, and the reference position of measurement is difficult to accurately position by adopting a new rocker arm rod, so the invention arranges an eccentric sleeve 6 on a servo valve detection device, the contact position of the contact of the measuring rod and the rocker arm rod is adjusted through the eccentric sleeve 6, so that OA = OB is achieved when the display value of the displacement display screen 8 is 0, and the positioning requirement of the reference position is met.
Referring to fig. 1, the servo valve detection method according to the present invention, which uses the servo valve detection device shown in the figure to complete the detection of the performance of the servo valve fault detector in the aircraft servo actuator, includes the following operation steps:
a. assembling a servo valve detection device: the fixed seat 5 is installed on a test bed, a rocker arm 2 is assembled on the horizontal wall of the fixed seat 5, the rocker arm 2 is hinged with the horizontal wall of the fixed seat 5 through a rotating shaft 3, a locking nail 9 is unscrewed, an eccentric sleeve 6 and a measuring rod 7 are sleeved and then placed in an eccentric sleeve assembling hole 5-1 of the vertical wall of the fixed seat 5, and the tail part of the measuring rod 7 is connected with a displacement display screen 8;
b. zero debugging: selecting a standard servo valve, connecting the standard servo valve in a hydraulic oil circuit, placing a measuring head at the lower end of a rocker arm rod at the middle position of the standard servo valve, controlling the oil pressure in the hydraulic oil circuit to be a set value, enabling the standard servo valve to be in a working state, moving a valve core of the standard servo valve to a middle position, pushing the rocker arm rod 2 to rotate for a certain angle around a rotating shaft 3, then rotating an eccentric sleeve 6 to drive a measuring rod 7 to rotate, simultaneously moving the central axis of the measuring rod 7 up and down, stopping rotating the eccentric sleeve 6 when the reading of a displacement display screen 8 is zero, and screwing a locking nail 9 to fix the eccentric;
c. workpiece installation: the standard servo valve is detached from the hydraulic oil circuit, the detected servo valve is connected in the hydraulic oil circuit, and the measuring head 2-1 at the lower end of the rocker arm rod 2 is arranged in the middle of the detected servo valve;
d. and (3) detection: the hydraulic oil circuit is communicated, the servo valve to be detected is in a working state, the valve core 1 moves towards the middle position, the rocker arm rod 2 is pushed to rotate for a certain angle around the rotating shaft 3, the measuring rod contact which is in contact with the upper end of the rocker arm rod 2 moves left and right for a certain distance, the numerical value displayed on the displacement display screen 8 is the measured value of the distance of the valve core of the servo valve deviating from the middle position at the moment, the oil pressure in the hydraulic oil circuit is adjusted, and the numerical value displayed on the displacement display screen 8 is;
e. judging whether the servo valve is qualified: observing and recording the numerical value of a pressure gauge in the hydraulic oil circuit, comparing the numerical value of the pressure gauge with the pressure value of the hydraulic oil circuit set by a standard, and judging that the detected servo valve does not meet the requirement when the numerical value of the pressure gauge exceeds the range of the standard set value; and when the numerical value of the pressure gauge is in the range of the standard set value, judging that the detected servo valve meets the requirement.

Claims (4)

1. A servo valve detection method adopts a servo valve detection device to complete detection of the performance of a servo valve fault detector in an aircraft servo actuator, and is characterized in that the servo valve detection device comprises a rocker arm rod (2), a rotating shaft (3), a measuring rod (7), an eccentric sleeve (6), a displacement display screen (8) and a fixed seat (5); the fixed seat (5) is arranged on a servo valve fault detection test bed, the fixed seat (5) is of an L-shaped structure, a rocker arm rod (2) is assembled on the horizontal wall of the fixed seat, and an eccentric sleeve (6) is assembled on the vertical wall of the fixed seat; two sides of the upper end of the rocker arm rod (2) are processed into planes, the middle part of the rocker arm rod is hinged with the horizontal wall of the fixed seat (5) through a rotating shaft (3), and the lower end of the rocker arm rod (2) is provided with a measuring head (2-1); one end of the measuring rod (7) is a contact which is in plane contact with the upper end side of the rocker arm rod (2), the other end of the measuring rod is connected with the displacement display screen (8), and the measuring rod (7) is installed on the fixed seat (5) through the eccentric sleeve (6); the eccentric sleeve (6) is assembled with an eccentric sleeve assembling hole (5-1) arranged on the vertical wall of the fixed seat (5); a notch (5-2) communicated with the eccentric sleeve assembling hole (5-1) is arranged on the fixed seat (5), a locking hole (5-3) is arranged at the position of the notch (5-2), and a locking nail (9) is assembled in the locking hole (5-3);
the servo valve detection method comprises the following operation steps:
a. assembling a servo valve detection device: the fixed seat (5) is installed on a servo valve detection test bed, a rocker arm rod (2) is assembled on the horizontal wall of the fixed seat (5), the rocker arm rod (2) is hinged with the horizontal wall of the fixed seat (5) through a rotating shaft (3), a locking nail (9) is unscrewed, an eccentric sleeve (6) and a measuring rod (7) are sleeved and then placed in an eccentric sleeve assembling hole (5-1) of the vertical wall of the fixed seat (5), and the tail part of the measuring rod (7) is connected with a displacement display screen (8);
b. zero debugging: selecting a standard servo valve, connecting the standard servo valve in a hydraulic oil circuit, placing a measuring head at the lower end of a rocker arm rod at the middle position of the standard servo valve, controlling the oil pressure in the hydraulic oil circuit to be a set value, enabling the standard servo valve to be in a working state, moving a valve core of the standard servo valve to a middle position, pushing the rocker arm rod (2) to rotate for a certain angle around a rotating shaft (3), then rotating an eccentric sleeve (6) to drive a measuring rod (7) to rotate, moving the central axis of the measuring rod (7) up and down, stopping rotating the eccentric sleeve (6) when the reading of a displacement display screen (8) is zero, and screwing a locking nail (9) to fix the eccentric sleeve (6);
c. workpiece installation: the standard servo valve is detached from the hydraulic oil circuit, the detected servo valve is connected in the hydraulic oil circuit, and the measuring head (2-1) at the lower end of the rocker arm rod (2) is arranged at the middle position of the detected servo valve;
d. and (3) detection: the hydraulic oil way is communicated, the servo valve to be detected is in a working state, the valve core (1) moves towards the middle position, the rocker arm rod (2) is pushed to rotate for a certain angle around the rotating shaft (3), the measuring rod contact contacted with the upper end of the rocker arm rod (2) moves left and right for a certain distance, the numerical value displayed on the displacement display screen (8) is the measured value of the deviation of the valve core of the servo valve from the middle position distance at the moment, the oil pressure in the hydraulic oil way is adjusted, and the numerical value displayed on the displacement display screen (8) is a set value;
e. judging whether the servo valve is qualified: observing and recording the numerical value of a pressure gauge in the hydraulic oil circuit, comparing the numerical value of the pressure gauge with the pressure value of the hydraulic oil circuit set by a standard, and judging whether the servo valve is qualified or not;
when the numerical value of the pressure gauge exceeds the range of the standard set value, the detected servo valve is judged not to meet the requirement; and when the numerical value of the pressure gauge is in the range of the standard set value, judging that the detected servo valve meets the requirement.
2. A servo valve checking method according to claim 1, characterized in that in the servo valve checking apparatus used therein, the deviation L = 0.25mm of the center axis of the inner bore of the eccentric sleeve (6) from the outer cylindrical surface thereof.
3. A servo valve detection method according to claim 2, wherein a rotary operating handle (6-1) is provided at one end of the eccentric sleeve (6).
4. A servo valve test method according to claim 3, characterized in that the holder (5) is fixed to the servo valve test stand by means of a set of screws (4).
CN201811361486.6A 2018-11-15 2018-11-15 Servo valve detection method Active CN109404364B (en)

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Application Number Priority Date Filing Date Title
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CN109404364B true CN109404364B (en) 2021-02-23

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