CN111120149A - Servo actuator stroke detection device - Google Patents
Servo actuator stroke detection device Download PDFInfo
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- CN111120149A CN111120149A CN201911279124.7A CN201911279124A CN111120149A CN 111120149 A CN111120149 A CN 111120149A CN 201911279124 A CN201911279124 A CN 201911279124A CN 111120149 A CN111120149 A CN 111120149A
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- servo actuator
- end device
- base
- servo
- stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to a stroke detection device, in particular to a stroke detection device of a servo actuator. It is by base, servo actuator stiff end device, servo actuator motion end device, accurate workstation, high accuracy grating chi and display device, servo actuator stiff end device fix on the base, servo actuator motion end device fixes on accurate workstation, is connected with the actuator piston rod, grating chi shank part is installed in the workstation side, the reading head passes through the connecting plate and is connected with servo actuator motion end device, grating chi digital display table installs on the base, passes through cable junction with the reading head. The method can judge the control precision of the servo actuator, ensure the accuracy and precision of test data, provide reliable basis, improve the measurement precision of the stroke of the servo actuator and improve the working efficiency.
Description
Technical Field
The invention relates to a stroke detection device, in particular to a stroke detection device of a servo actuator.
Background
The servo actuator is used as an actuating mechanism of a thrust vector control system for a ground test of the solid rocket engine and is used for generating lateral control moment according to an instruction of the control system and controlling the pitching and yawing direction swinging of the spray pipe. The servo actuator is an automatic control device combining precision machinery, electricity and hydraulic pressure, and consists of a plurality of mechanical parts, elements and hydraulic parts, the structure is complex, and the reliability of the ground test of the engine is directly influenced by the performance of the servo actuator. In order to ensure that the performance and the precision of the servo actuator meet the specified technical index requirements, before the servo actuator leaves a factory, related performance tests are required to be carried out according to the requirements of design files and process files, and the test results meet the technical index requirements and can be delivered to military and use units. However, when the servo actuator is operated in a severe environment such as ignition shock, vibration, high-pressure water shock cooling, etc. during engine test, the instantaneously generated impact force may generate large vibration to the actuator. Meanwhile, after test run, the temperature of the water spray is reduced, so that temperature impact can be caused to the actuator components, and the reliability of the actuator is reduced. At present, the servo actuator for the ground test needs to be repeatedly used in a plurality of tests, so that whether parts of the servo actuator are damaged or not and whether the performance meets the requirement of reuse or not after the test under the severe working condition is carried out, the judgment is needed to be made through detection and application of high-precision test equipment and a professional test means. In order to ensure the reliability of the engine test run, specific requirements are put forward for the inclusion of the servo actuator: after the servo actuator is used, the servo actuator needs to be disassembled and overhauled, and stroke detection of the servo actuator needs to be carried out before the servo actuator is used.
Disclosure of Invention
The technical problems to be solved by the invention are as follows:
the invention provides a stroke detection device for a servo actuator, which aims to solve the technical problems that the stroke detection of the servo actuator adopts manual push-pull of the piston rod of the servo actuator to move, and a vernier caliper is used for measuring the telescopic length of the piston rod, so that the measurement precision is low.
The technical scheme adopted by the invention is as follows:
the utility model provides a servo actuator stroke detection device, includes base, servo actuator stiff end device, servo actuator motion end device, accurate workstation, high accuracy grating chi and display device, servo actuator stiff end device fix on the base, servo actuator motion end device fixes on accurate workstation, is connected with the actuator piston rod, grating chi body part is installed in the workstation side, and the reading head passes through the connecting plate and is connected with servo actuator motion end device, and grating chi digital display table installs on the base, passes through cable junction with the reading head.
Furthermore, the base is formed by welding rectangular steel pipes and Q235 plates, and the length is multiplied by the width by the height =800mm by 348mm by 107 mm.
Furthermore, the diameters phi 12mm, phi 15mm and phi 20mm of pin shaft holes of three specifications are sequentially designed on the fixed end device from top to bottom, and the connection sizes d1 and d2 of the fixed end device of the servo actuator are respectively designed to be 28mm and 50 mm.
Furthermore, the precision workbench adopts a rolling linear guide rail pair as a guide support.
Furthermore, the accuracy grade of the single-coordinate worktable of the DZHT400 series with the selection stroke of 400mm is P3 grade, the positioning accuracy is 0.025mm, and the repeated positioning accuracy is +/-0.003 mm.
The beneficial effects obtained by the invention are as follows:
the invention adopts the transmission mechanism and the optical measurement method to convert the manual rotation motion into the linear reciprocating motion to detect the stroke of the servo actuator, thereby improving the measurement precision of the stroke of the servo actuator and improving the working efficiency.
Drawings
FIG. 1 is a schematic diagram of a servo actuator stroke detection device;
FIG. 2 is a flow chart of a servo actuator stroke detection process;
FIG. 3 is a schematic diagram of a servo actuator stroke detection device;
wherein: 1. the device comprises a base, 2 a precise workbench, 3 a servo actuator fixed end device, 4 a servo actuator, 5 a servo actuator moving end device, 6 a high-precision grating ruler and 7 a display device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the stroke detection device of the servo actuator is composed of a base, a servo actuator fixed end device, a servo actuator moving end device, a precise workbench, a high-precision grating ruler and a display device, wherein the servo actuator fixed end device is fixed on the base and connected with an actuator fixed end. The motion end device of the servo actuator is fixed on the precise workbench and is connected with a piston rod of the actuator. The grating ruler body part is installed on the side surface of the workbench, the reading head is connected with the servo actuator movement end device through a connecting plate, and the grating ruler digital display meter is installed on the base and connected with the reading head through a cable.
As shown in fig. 2 and 3, the stroke detection device of the servo actuator is composed of a base, a fixed end device of the servo actuator, a moving end device of the servo actuator, a precise workbench, a high-precision grating scale and a display device.
1) Base seat
The base mainly plays a role in fixing and supporting each structural part. The steel pipe is formed by welding rectangular steel pipes and Q235 plates, has the length multiplied by the width multiplied by the height =800 multiplied by 348 multiplied by 107 (mm), and has higher strength and rigidity. The size of the base is selected comprehensively considering the factors of compactness of part installation, light weight of the whole body, rationalization of the space design of the working post form and the like.
2) Servo actuator fixed end device
The servo actuator fixed end device is fixed on the base and connected with the actuator fixed end. According to the difference of the pin hole of the actuator with different models, the diameters phi 12mm, phi 15mm and phi 20mm of the pin hole with three specifications are sequentially designed on the fixed end device of the servo actuator from top to bottom. The attachment dimensions d1, d2 of the fixed end device of the servo actuator are designed to be 28mm, 50mm, respectively, at the maximum required. When connecting different model servo actuator, adopt the spacer of the round pin shaft hole diameter of different specifications and corresponding thickness, can guarantee the accurate of actuator stiff end and connect.
3) Moving end device of servo actuator
The motion end device of the servo actuator is fixed on the precise workbench and is connected with a piston rod of the actuator. The same as the supporting lug hole of the fixed end device of the servo actuator, and the gaskets with the diameters of the pin shafts and the corresponding thicknesses of the three specifications are designed. The servo actuator moving end device moves along with the high-precision lead screw to drive the piston rod to stretch.
4) Precision workbench
The precision workbench adopts a rolling linear guide rail pair as a guide support, and a ball screw pair is a motion executing element. The device has the characteristics of high precision, high efficiency, long service life, small abrasion, energy conservation, low consumption, small friction coefficient, compact structure, strong universality and the like.
And finally selecting a DZHT400 series single-coordinate worktable with the stroke of 400mm according to the requirements of different zero position lengths, strokes and motion precision of the servo actuator. The precision grade is P3 grade, and the positioning precision is 0.025 mm; the repeated positioning precision is +/-0.003 mm. Considering the existence of greasy dirt in the working environment, protective devices are added at two ends of the mobile platform. And the workbench is rechecked and checked. From the sample, the model number of the guide rail pair GGB25BA2P2 and the model number of the ball screw pair FFB2005-2 of the workbench can be known.
5) High-precision grating ruler
According to the use requirement of the detection device and the requirements of the zero position length and the stroke of the servo actuator, the linear grating ruler which is manufactured by FAGOR company and has the model number of MKX-42, the measurement length of 420mm and the measurement precision of 0.01mm is selected as the grating ruler.
The body part of the grating ruler is arranged on the side surface of the workbench, and the reading head is connected with the motion end device of the servo actuator through a connecting plate. The bolt is screwed down by adjusting the ruler body of the grating ruler, so that the grating ruler and the guide rail are aligned at multiple points, and the parallelism of the ruler body meets 0.1mm/1000 mm.
6) Display device
A single-shaft 10i series digital display meter of FAGOR company is selected to be matched with a grating ruler for use. The grating ruler digital display meter is arranged on the base and is connected with the reading head through a cable, and the measurement displacement of the grating ruler is displayed in real time.
Claims (5)
1. A servo actuator stroke detection device characterized in that: including base, servo actuator stiff end device, servo actuator motion end device, accurate workstation, high accuracy grating chi and display device, servo actuator stiff end device fix on the base, servo actuator motion end device fixes on accurate workstation, is connected with the actuator piston rod, grating chi body part is installed in the workstation side, and the reading head passes through the connecting plate and is connected with servo actuator motion end device, and grating chi digital display table installs on the base, passes through cable junction with the reading head.
2. The servo actuator stroke sensing device of claim 1, wherein: the base is formed by welding rectangular steel pipes and Q235 material plates, and the length is multiplied by the width by the height =800mm by 348mm by 107 mm.
3. The servo actuator stroke sensing device of claim 1, wherein: the diameters phi 12mm, phi 15mm and phi 20mm of pin shaft holes of three specifications are sequentially designed from top to bottom of the fixed end device, and the connection sizes d1 and d2 of the fixed end device of the servo actuator are respectively designed to be 28mm and 50 mm.
4. The servo actuator stroke sensing device of claim 1, wherein: the precision workbench adopts a rolling linear guide rail pair as a guide support.
5. The servo actuator stroke detecting device according to claim 4, wherein: the accuracy grade of the DZHT400 series single-coordinate worktable with the selection stroke of 400mm is P3 grade, the positioning accuracy is 0.025mm, and the repeated positioning accuracy is +/-0.003 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911279124.7A CN111120149A (en) | 2019-12-13 | 2019-12-13 | Servo actuator stroke detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911279124.7A CN111120149A (en) | 2019-12-13 | 2019-12-13 | Servo actuator stroke detection device |
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| CN111120149A true CN111120149A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911279124.7A Pending CN111120149A (en) | 2019-12-13 | 2019-12-13 | Servo actuator stroke detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412083A (en) * | 2020-04-03 | 2020-07-14 | 北京中科宇航技术有限公司 | Method for determining length change of servo actuator |
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| US20030002198A1 (en) * | 2001-07-02 | 2003-01-02 | Subrahamanyan Pradeep K. | High bandwidth large stroke spin-stand for data storage component testing |
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2019
- 2019-12-13 CN CN201911279124.7A patent/CN111120149A/en active Pending
Patent Citations (6)
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| US20030002198A1 (en) * | 2001-07-02 | 2003-01-02 | Subrahamanyan Pradeep K. | High bandwidth large stroke spin-stand for data storage component testing |
| CN102297177A (en) * | 2011-07-13 | 2011-12-28 | 北京理工大学 | Pneumatic servo actuator |
| CN202362109U (en) * | 2011-12-10 | 2012-08-01 | 内蒙航天动力机械测试所 | Ground energy output pressure real-time display device of electrohydraulic servo mechanism |
| CN203840283U (en) * | 2014-04-28 | 2014-09-17 | 上海劲越实业发展有限公司 | Apparatus for testing dynamic and mechanical load of photovoltaic assembly through air bag |
| CN105136477A (en) * | 2015-09-22 | 2015-12-09 | 浙江泰鸿机电有限公司 | Pedal assembly performance testing stand |
| CN107101830A (en) * | 2017-04-30 | 2017-08-29 | 南京理工大学 | A kind of electrical servo straight line loads test system |
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| 褚福刚等: "1553B总线喷管测控系统数字化设计与实现", 《无线电工程》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412083A (en) * | 2020-04-03 | 2020-07-14 | 北京中科宇航技术有限公司 | Method for determining length change of servo actuator |
| CN111412083B (en) * | 2020-04-03 | 2021-09-14 | 北京中科宇航技术有限公司 | Method for determining length change of servo actuator |
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