CN117890116A - High-precision plate spring test device of micro-thrust engine - Google Patents
High-precision plate spring test device of micro-thrust engine Download PDFInfo
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Abstract
The invention belongs to the technical field of micro-thrust engine testing, and particularly relates to a high-precision plate spring testing device of a micro-thrust engine. The invention comprises an engine, a fixed frame, a mechanical stress application device, a force measurement assembly, a calibration assembly and a hanging type plate spring structure, wherein the mechanical stress application device and the hanging type plate spring structure are respectively connected with two ends of the upper surface of the fixed frame; the hanging type plate spring structure comprises a plate spring, a limiting component, a movable frame and a hanging support, wherein the bottom of the hanging support is connected to the fixed frame; the movable frame is connected in the hanging support through a plate spring and a limiting component; one end of the leaf spring is connected to the hanging support, and the other end is connected with the movable frame; one end of the limiting component is connected to the hanging support, and the other end of the limiting component is connected with the movable frame; the force measuring assembly is arranged between the mechanical force applying device and the movable frame, one end of the force measuring assembly is connected to the fixed frame, and the other end of the force measuring assembly is connected to the movable frame; one end of the calibration component is connected with the fixed frame, and the other end of the calibration component is connected with the movable frame; the engine is connected at the outside end of moving the frame, and is located the opposite side of dynamometry subassembly.
Description
Technical Field
The invention belongs to the technical field of micro-thrust engine testing, and relates to a high-precision leaf spring testing device of a micro-thrust engine.
Background
With the rapid development of space science and control technology in recent years, higher requirements are also placed on accurate control of a powered micro-thrust engine and a test device thereof. The high-precision leaf spring test device of the micro-thrust engine is small in measured force value, the test result is greatly influenced by external interference, a test system is difficult to isolate in the test, the existing micro-thrust engine test device mainly adopts a supporting leaf spring structure, the leaf spring not only bears the thrust of the engine, but also is influenced by the gravity of the engine, and the structure is easily influenced by the test environment and the interference of the engine, so that the accuracy of the thrust test is influenced.
Disclosure of Invention
The invention aims to provide a high-precision plate spring test device of a micro-thrust engine, which aims to solve the problems that micro-force measurement is influenced by environmental interference, and a system is anti-seismic, anti-electromagnetic interference, anti-noise and anti-temperature interference. The device is particularly suitable for test detection of 5-10N thrust engines.
The invention relates to a high-precision leaf spring test device of a micro-thrust engine, which at least comprises an engine, a fixed frame, a mechanical stress application device, a force measurement assembly, a calibration assembly and a hanging leaf spring structure, wherein the mechanical stress application device and the hanging leaf spring structure are respectively connected with two ends of the upper surface of the fixed frame; the hanging type plate spring structure comprises a plate spring, a limiting component, a movable frame and a hanging support, wherein the bottom of the hanging support is connected to the fixed frame; the movable frame is connected in the hanging support through a plate spring and a limiting component; one end of the leaf spring is connected to the hanging support, and the other end is connected with the movable frame; one end of the limiting component is connected to the hanging support, and the other end of the limiting component is connected with the movable frame; the force measuring assembly is arranged between the mechanical force applying device and the movable frame, one end of the force measuring assembly is connected to the fixed frame, and the other end of the force measuring assembly is connected to the movable frame; one end of the calibration assembly is connected with the fixed frame, and the other end of the calibration assembly is connected with the movable frame; the engine is connected to the outer side end of the movable frame and is located on the opposite side of the force measuring assembly.
The hanging support comprises a front hanging support frame and a rear hanging support frame; the front hanging support frame and the rear hanging support frame are parallel and vertically connected to one side of the upper surface of the fixed frame, and the projection of the support frame and the rear hanging support frame on the fixed frame is perpendicular to the axis of the fixed frame.
The movable frame comprises four dowel bars, a movable frame front force plate and a movable frame rear force plate; the movable frame front force plate and the movable frame rear force plate are relatively arranged in parallel, and are connected into a frame structure through four parallel dowel bars;
the upper ends of the outer side walls of the movable frame front force plate and the movable frame rear force plate are respectively provided with a through groove which is horizontally arranged; the front side of the movable frame front force plate is connected with the force measuring assembly; the rear side of the movable frame front force plate is connected with the calibration assembly; the plate springs are provided with two plates; the upper ends of the two leaf springs are respectively arranged in the middle of the upper ends of the outer side surfaces of the front support frame and the rear support frame, and the lower ends of the two leaf springs are respectively connected with the middle of the through grooves of the front force plate of the movable frame and the rear force plate of the movable frame; the limiting component is arranged around the movable frame front force plate and the movable frame rear force plate.
The movable frame front force plate 28 and the movable frame rear force plate 30 are rectangular, and four dowel bars 29 are connected in parallel to four corners of the movable frame front force plate 28 and the movable frame rear force plate 30.
The limiting assembly comprises eight vertical limiting rods and eight lateral limiting rods; four vertical limiting rods and four lateral limiting rods are respectively arranged around the movable frame front force plate and the movable frame rear force plate; two vertical limiting rods are oppositely arranged at the upper end and the lower end of the movable frame front force plate respectively, one end of each vertical limiting rod is connected with the front hanging support frame, and the other end of each vertical limiting rod is connected with the movable frame front force plate; two sides of the front force plate of the movable frame are respectively and oppositely provided with two lateral limiting rods, one end of each lateral limiting rod is connected with the front hanging support frame, and the other end of each lateral limiting rod is connected with two sides of the front force plate;
two vertical limiting rods are correspondingly arranged at the upper end and the lower end of the movable frame rear force plate respectively, one end of each vertical limiting rod is connected with the rear hanging support frame respectively, and the other end of each vertical limiting rod is connected with the movable frame rear force plate respectively; two sides of the movable frame rear force plate are respectively and correspondingly provided with two lateral limiting rods, one end of each lateral limiting rod is respectively connected with the rear hanging support frame, and the other end of each lateral limiting rod is connected to the movable frame rear force plate.
The middle position of the lower ends of the front side and the rear side of the movable frame front force plate is connected with two groups of pre-tightening force components, each pre-tightening force component comprises a pre-tightening spring, a pre-tightening ejector rod and a support, the support is connected to the fixed frame, the pre-tightening ejector rods are transversely connected to the support in parallel with the axis of the fixed frame, the pre-tightening springs are connected to the opposite ends of the pre-tightening ejector rods, and the pre-tightening springs are respectively propped against the two ends of the movable frame front force plate.
The calibration assembly comprises a calibration sensor, a calibration sensor seat, a calibration adapter, a calibration front beam, a calibration rear beam and two calibration pull rods;
the front calibration beam and the rear calibration beam are arranged in parallel; the two calibration pull rods are connected to the fixed frame and are arranged in parallel, and two ends of each calibration pull rod are respectively connected to the front calibration beam and the rear calibration beam; one end of the calibration adapter is connected with the mechanical stress application device, and the other end of the calibration adapter is connected with the middle part of the calibration front cross beam; the calibration sensor is connected to the movable frame through a seat.
The fixed frame comprises a fixed frame platform, a heightening seat and a bearing pier; the fixed frame platform is of a box type structure, the heightening seat is connected to one end of the upper surface of the platform, and the mechanical stress application device is connected to the heightening seat; the bearing pier is connected to the fixed frame platform and is arranged between the mechanical stress application device and the hanging support; the middle position of the bearing pier is provided with a centering hole, two sides of the centering hole are respectively provided with a side hole, one end of the force measuring assembly is connected in the centering hole, and the calibration assembly penetrates through the two side holes.
The mechanical stress application device at least comprises a hand wheel, a planetary reducer, a mechanical stress application bearing assembly and a linear sliding table; the hand wheel is connected to the end part of the mechanical stress application bearing assembly through a planetary reducer, and the linear sliding table is connected to the lower part of the mechanical stress application bearing assembly; a telescopic rod for connecting the calibration assembly is connected on the central axis of the mechanical stress bearing assembly.
The force measuring assembly is horizontally arranged along the axial direction; the force measuring component comprises a high-precision sensor, a sensor seat, a pressure head and a force transmission ejector rod; the force transmission ejector rod is connected to the fixed frame, and the high-precision sensor is connected to the movable frame through a sensor seat and is positioned at the inner side end of the movable frame; the top of the high-precision sensor is provided with a pressure head which is in point contact with the force transmission ejector rod.
The invention has the beneficial effects that:
because of adopting the hanging type plate spring structure, compared with the structure that the plate spring seat is connected with the fixed frame, the structure reduces the influence on the air inlet flow field of the engine during test run, further improves the natural frequency of the rack and increases the reliability of the test.
The hydraulic calibration device is relatively troublesome in calibration and stability under the condition of small thrust in-situ calibration, and the time required for achieving a stable state is long, so that the efficiency of mechanical stress application is relatively high. The working principle of the hydraulic loading calibration system is basically similar to that of the hydraulic loading calibration system, and the force-applying oil cylinder is replaced by a mechanical loading system, so that the force-transferring path is consistent with the hydraulic loading.
The dynamic micro-thrust is measured by selecting a high-frequency response high-precision sensor; calibration is completed through the calibration component and the mechanical stress application device, the force measurement coefficient and precision are obtained through data acquisition and analysis, the mechanical calculation model is corrected, and precision measurement of the high-precision leaf spring test frame of the micro-thrust engine is realized.
The method can meet the technical requirements of superscalar in terms of test precision, interference resistance, force value resolution and operation simplicity; the coaxiality requirement of the engine axis and the dynamometer component axis during installation can be ensured; the strength safety coefficient of the test stand can be ensured to be not less than 2.5; the thrust test accuracy can be ensured to be not lower than 1% FS (steady thrust).
The foregoing description is merely an overview of the embodiments of the present invention and, in order to more clearly illustrate the embodiments of the present invention or the prior art, the following brief description of the drawings is provided for the purpose of illustrating the embodiments of the present invention.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a schematic of a mechanical stress application device of the present invention;
FIG. 4 is a schematic diagram of a calibration assembly installation of the present invention;
FIG. 5 is a schematic view showing the installation of the plate spring and the stop lever of the present invention
FIG. 6 is a schematic view of the structure of the movable frame of the present invention;
FIG. 7 is a schematic diagram of the pretension assembly of the present invention;
in the figure: 1. a fixed frame platform; 2. a heightening seat; 3. a mechanical stress application device; 4. force bearing piers; 5. a force measuring assembly; 6. a leaf spring; 7. a limit component; 8. a movable frame; 8-1, a through groove; 9. a calibration assembly; 10. hanging and supporting; 11. a pre-tightening force assembly; 11-1, pre-tightening a spring; 11-2, pre-tightening the ejector rod; 11-3, a support; 12. an engine; 13. calibrating the front cross beam; 14. a sensor socket; 15. a high-precision sensor; 16. calibrating the rear cross beam; 18. a rear hanging support frame; 19. calibrating the sensor; 20. a front hanging support frame; 21. calibrating the pull rod; 22. calibrating the adapter; 23. a hand wheel; 24. a planetary reducer; 25. a mechanical stress bearing assembly; 26. a linear sliding table; 27. a telescopic rod; 28. a movable frame front force plate; 29. a dowel bar; 30. a movable frame rear force plate; 31. a force transmission ejector rod; 32. a pressure head; 34. calibrating the sensor socket.
Detailed Description
The high-precision leaf spring test device of the micro-thrust engine as shown in the figures 1-3 comprises an engine 12, a fixed frame, a mechanical force applying device 3, a force measuring component 5, a calibration component 9 and a hanging leaf spring structure, wherein the mechanical force applying device 3 and the hanging leaf spring structure are respectively connected to two ends of the upper surface of the fixed frame; the hanging type plate spring structure comprises a plate spring 6, a limiting component 7, a movable frame 8 and a hanging support 10, wherein the bottom of the hanging support 10 is connected to a fixed frame; the movable frame 8 is connected in the hanging support 10 through the plate spring 6 and the limiting component 7; one end of the plate spring 6 is connected to the hanging support 10, and the other end is connected with the movable frame 8; one end of the limiting component 7 is connected to the hanging support 10, and the other end is connected with the movable frame 8; the force measuring assembly 5 is arranged between the mechanical force applying device 3 and the movable frame 8, one end of the force measuring assembly 5 is connected to the fixed frame, and the other end of the force measuring assembly 5 is connected to the movable frame 8; one end of the calibration assembly 9 is connected with the fixed frame, and the other end of the calibration assembly 9 is connected with the movable frame 8; the motor 12 is connected to the outer end of the movable frame 8 and is located on the opposite side of the force measuring assembly 5.
The hanging support 10 is a main component for installing the plate spring 6 and the movable frame 8 and comprises a front hanging support frame 20 and a rear hanging support frame 18; the front hanging support frame 20 and the rear hanging support frame 18 are connected to one side of the upper surface of the fixed frame in parallel and vertically, and the projection of the support frame 20 and the rear hanging support frame 18 on the fixed frame is perpendicular to the axis of the fixed frame. The front hanging support frame 20 and the rear hanging support frame 18 are fixed on the fixed frame through a plurality of groups of bolts, leaf springs and limiting rod mounting holes are reserved on the front hanging support frame and the rear hanging support frame, the installation is easy, the machining precision is high, the leaf springs are mounted on the surface of the support frame, limiting rod mounting spaces are machined in the front support frame and the rear support frame, and the movable frame force plate is mounted inside the movable frame force plate.
As shown in fig. 6, the movable frame 8 includes four force transfer rods 29, a movable frame front force plate 28 and a movable frame rear force plate 30; the movable frame front force plate 28 and the movable frame rear force plate 30 are oppositely arranged in parallel, and the movable frame front force plate 28 and the movable frame rear force plate 30 are connected into a frame structure through four parallel dowel bars 29; the movable frame front force plate 28 and the movable frame rear force plate 30 are square or rectangular, and four dowel bars 29 are connected in parallel to four corners of the movable frame front force plate 28 and the movable frame rear force plate 30.
The upper ends of the outer side walls of the movable frame front force plate 28 and the movable frame rear force plate 30 are respectively provided with a horizontal through groove 8-1; the front side of the movable frame front force plate 28 is connected with the force measuring assembly 5; the rear side of the movable frame front force plate 28 is connected with the calibration assembly 9; the plate spring 6 is provided with two; the upper ends of the two leaf springs 6 are respectively arranged in the middle of the upper ends of the outer side surfaces of the front support frame 20 and the rear support frame 18, and the lower ends of the two leaf springs are respectively connected with the middle of a through groove 8-1 of the movable frame front force plate 28 and the movable frame rear force plate 30; the limiting assembly 7 is arranged around the front force plate 28 and the rear force plate 30.
As shown in fig. 5, the leaf spring 6 is a flexible support structure, a key component of the test stand, and a primary component for connecting the movable stand and the fixed stand, and the device is provided with a front leaf spring 6 and a rear leaf spring 6, which are used for supporting the mass of the engine-movable stand combination and providing a small displacement degree of freedom for axial movement along the engine, so that the thrust of the engine is totally applied to the thrust sensor. Typically, the material is selected from high strength spring steel. According to the characteristics of the test frame, two special leaf springs are designed, stress and displacement analysis can be carried out on the steady state and the working state of the leaf springs by adopting finite element analysis software, the stability and the reliability of the leaf springs are ensured to meet the index requirements, and the safety coefficient can be ensured to be not less than 2.5.
The movable frame 8 is connected in the hanging support 10 by four dowel bars 29 and two force plates through the limiting component 7 and the plate spring 6, and looks like hanging in the air. The front force plate and the rear force plate of the movable frame 8 are integrally machined into a thick plate, the required tolerance requirement is guaranteed, and a centering hole, a force measuring assembly mounting hole and the like are reserved in the middle of the upper surface.
The front end of the front force plate 28 is connected with a high-precision sensor 15 through a sensor seat 14; the calibration sensor 19 is connected to the rear end of the front force plate 28 by a socket 34; the rear force plate 30 is connected with the tested engine 12;
the safety limiting component 7 of the invention mainly comprises limiting rods, is arranged around the movable frame power plate, connects the movable frame 8 with the hanging support 10 in non-experiment, and has the following functions: 1. adjustment in mounting alignment; 2. a movable frame limiting function under the non-test condition; 3. the pre-tightening force can be provided for the movable frame; 4. safening effect at test. When the safety limiting assembly 7 is opened during calibration, the movable frame 8 is only connected to the hanging support 10 through the plate spring 6, the movable frame 8 is in a free state, and the calibration is completed through the combined action of the mechanical stressing device 4 and the calibration assembly 9; during the test, the calibration device is completely separated from the test system, so that the thrust of the tested engine can be completely transmitted to the high-precision sensor, and test data is recorded through the data acquisition system to complete the test of the engine. The limiting assembly 7 shown in fig. 1 is a vertically arranged limiting rod, and the limiting assembly 7 shown in fig. 2 is a laterally arranged limiting rod;
the limiting assembly 7 comprises eight vertical limiting rods and eight lateral limiting rods; four vertical limiting rods and four lateral limiting rods are respectively arranged around the movable frame front force plate 28 and the movable frame rear force plate 30; two vertical limiting rods are oppositely arranged at the upper end and the lower end of the movable frame front force plate 28 respectively, one end of each vertical limiting rod is connected with the front hanging support frame 20, and the other end of each vertical limiting rod is connected with the movable frame front force plate 28; two lateral limiting rods are respectively and oppositely arranged on two sides of the movable frame front force plate 28, one end of each lateral limiting rod is connected with the front hanging support frame 20, and the other end of each lateral limiting rod is connected with two sides of the front force plate 28;
two vertical limiting rods are correspondingly arranged at the upper end and the lower end of the movable frame rear force plate 30 respectively, one end of each vertical limiting rod is connected with the rear hanging support frame 18 respectively, and the other end of each vertical limiting rod is connected with the movable frame rear force plate 30 respectively; two lateral limiting rods are correspondingly arranged on two sides of the movable frame rear force plate 30 respectively, one end of each lateral limiting rod is connected with the rear hanging support frame 18 respectively, and the other end of each lateral limiting rod is connected to the movable frame rear force plate 30.
As shown in fig. 7, the pre-tightening force assembly 11 is connected to the middle position of the lower ends of the front and rear sides of the movable frame front force plate 28, and the pre-tightening force assembly 11 is used for preventing the contact between the high-precision sensor and the bearing assembly from being unstable and generating large overshoot when the pre-tightening force assembly 11 is used for the engine test. The pre-tightening force assembly 11 comprises two groups, including pre-tightening springs 11-1, pre-tightening ejector rods 11-2 and supporting seats 11-3, wherein the supporting seats 11-3 are connected to the fixed frame, the pre-tightening ejector rods 11-2 are transversely connected to the supporting seats 11-3 in parallel with the axis of the fixed frame, the pre-tightening springs 11-1 are connected to opposite ends of the pre-tightening ejector rods 11-2, and the pre-tightening springs are respectively propped against two ends of the movable frame front force plate 28. In the test, a certain thrust force can be applied to the movable frame 8 in advance, so that the high-precision sensor 15 and the bearing assembly are reliably compacted, and the application force value is generally 0.1-5% of the rated thrust force value.
In fig. 4, the calibration assembly 9 is composed of a calibration sensor 19, a calibration sensor seat 34, a calibration adapter 22, a calibration front beam 13, a calibration rear beam 16 and two calibration pull rods 21;
the front calibration beam 13 and the rear calibration beam 16 are arranged in parallel; the two calibration pull rods 21 pass through the bearing piers 4 in parallel, and two ends of each calibration pull rod 21 are respectively connected to the calibration front beam 13 and the calibration rear beam 16; one end of the calibration adapter 22 is connected with the mechanical stress application device 3, and the other end of the calibration adapter 22 is connected with the middle part of the calibration front cross beam 13; the calibration sensor 19 is attached to the rear side of the movable frame front force plate 28 after being connected to the calibration sensor mount 34.
The calibration pull rod 21 plays a role in supporting the front and rear beams and transmitting displacement, and the calibration adapter 22 connects the calibration front beam 13 with the mechanical stressing device 3, and the calibration rear beam 16 is arranged between the two movable frame power plates. The calibration sensor 19 and the precision sensor 15 are positioned on the same axis on the front side and the rear side of the front force plate 28 of the same movable frame, so that the calibration accuracy is ensured. In the calibration work, the mechanical stressing device 3 is driven by the hand wheel 23 to drive the calibration front cross beam 13, the calibration pull rod 21 and the rear calibration rear cross beam 16 to move slightly in the axial direction, the calibration rear cross beam 16 presses the calibration sensor 19, the movable frame front force plate 28 presses the precision sensor 15, and the calibration sensor 19 and the precision sensor 15 of the force measuring assembly 5 feel the same force, so that the in-situ calibration is realized.
The heightening seat 2 is fixed on the fixed frame by bolts and is used for supporting the mechanical force application device 3, so that the mechanical force application device 3 and the force measurement assembly 5 are ensured to be on the same axis.
The fixed frame comprises a fixed frame platform 1, a heightening seat 2 and a bearing pier 4; the fixed frame platform 1 is of a box type structure and is formed by assembling and welding steel plates, the structure is stable and reliable, deformation is not easy to occur, and tiny disturbance in a test can be reduced to the greatest extent; the upper and lower connecting surfaces are processed, so that the requirements of parallelism and flatness are ensured. A lifting handle (or lifting ring) is arranged at the side direction, so that the rack can be conveniently transported; the heightening seat 2 and the bearing pier 4 are both fixed at one end of the upper surface of the fixed frame platform 1; the mechanical stress application device 3 is connected to the heightening seat 2; the bearing pier 4 is connected to the fixed frame platform 10 and is arranged between the mechanical stress application device 3 and the hanging support 10; the bearing pier 4 is connected with the fixed frame through bolts, and is connected with the force measuring assembly 5 and the calibration assembly 9, is a main bearing component, is formed by processing high-quality steel after heat treatment, is mainly used for bearing the working thrust of an engine after each use surface is precisely processed, is provided with a centering hole, and is convenient to test and center so as to ensure the coaxiality requirement of the axis of the engine and the axis of the force measuring assembly during installation. The middle position of the force bearing pier 4 is provided with a centering hole, two sides of the centering hole are respectively provided with a side hole, wherein the centering hole is connected with a force transmission ejector rod 31 of the force measuring assembly 5, and two calibration pull rods 21 penetrate through the two side holes on the force bearing pier 4.
The mechanical stress application device 3 shown in fig. 3 at least comprises a hand wheel 23, a planetary reducer 24, a mechanical stress application bearing assembly 25 and a linear sliding table 26; the hand wheel 23 is connected to the end part of the mechanical stress bearing assembly 25 through a planetary reducer 24, and the linear sliding table 26 is connected to the lower part of the mechanical stress bearing assembly 25; the mechanical load bearing assembly 25 is provided with a telescopic rod 27 along the axis, the telescopic rod 27 being connected to the calibration assembly 9. When the mechanical force applying device 3 is driven by the hand wheel, the calibration device moves a little in the axial direction, so that the calibration sensor and the force transducer feel the same force, and the in-situ calibration is realized. Because the hydraulic force application device is relatively troublesome in calibration and stabilization and has long stabilization time under the condition of in-situ calibration within 1kN (including 1 kN), the mechanical force application device 3 shown in figure 3 is relatively high in efficiency, the mechanical force application device 3 is arranged on the elevating seat 2 of the fixed frame, is connected with the calibration front cross beam 13 through the calibration adapter 22, rotates the hand wheel 23 too slowly in calibration, combines the planetary reducer 24 and the telescopic rod 27, can apply corresponding force to the calibration sensor 19, and finally transmits the force to the high-precision calibration sensor 15 through the force transmission ejector rod 31. In addition, the mechanical force application device 3 is provided with the linear sliding table 26, so that the position can be properly adjusted, and the linear sliding table 26 can be used for adjusting the position during calibration, thereby increasing the flexibility of use.
As shown in fig. 4, the force measuring assembly 5 is horizontally arranged along the axial direction; the force measuring assembly 5 comprises a high-precision sensor 15, a sensor seat 14, a pressure head 32 and a force transmission ejector rod 31; the force transmission ejector rod 31 is connected to the force bearing pier 4 of the fixed frame, and the high-precision sensor 15 is connected to the movable frame front force plate 28 through the sensor seat 14 and is positioned at the inner side end of the movable frame front force plate 28; the top of the high-precision sensor 15 is provided with a pressure head 32, and the pressure head 32 is in point contact with the force transmission ejector rod 31. The sensor seat 14 is arranged between the movable frame 8 and the bearing pier 4, can be axially adjusted, has small deformation, no gap and reliable locking. The high-precision sensor 15 is selected and used, so that the thrust testing precision is not lower than 1%FS, the micro thrust generated by an engine test can be sensed, and the change of a force value can be converted into a voltage signal to be transmitted to a data acquisition system.
Calibration of the high-precision sensor directly affects the accuracy of the test. In the calibration work, the mechanical stressing device 3 is driven by the hand wheel 23 to drive the calibration front cross beam 13, the calibration pull rod 21 and the calibration rear cross beam 16 to move slightly in the axial direction, the calibration rear cross beam 16 presses the calibration sensor 19, and the movable frame front force plate 28 presses the high-precision sensor 15, so that the calibration sensor 19 and the high-precision sensor 15 feel the same force, and the in-situ calibration is realized. The high-precision sensor can be a laser sensor ， The calibration sensor 19 is a piezoelectric sensor.
When the test device is installed, the test bench and the tested engine are installed through centering, and the bench is provided with a centering hole so as to facilitate centering, wherein the purpose of centering is to ensure that the force measuring assembly 5 and the engine 12 are on the same axis; before the test, firstly, the calibration work of the high-precision sensor 15 is completed, the safety limiting assembly 7 is opened during the calibration, at this time, the movable frame 8 is only connected to the hanging support 10 by the plate spring 6, the movable frame 8 is in a free state, and the calibration is completed through the combined action of the mechanical stressing device 3 and the calibration assembly 9; during the test, the calibration assembly 9 is completely separated from the test system, so that the thrust of the tested engine 12 can be completely transmitted to the high-precision sensor 15, and test data is recorded through the data acquisition system, so that the test of the engine is completed.
In addition, the test device is provided with a standard load measuring instrument for displaying the indication value of the standard push sensor.
When the test device is installed, the bearing pier 4 and the hanging support 10 are installed on a fixed frame platform; then the movable frame 8 is installed, when the movable frame 8 is installed, the plate spring 6 and the limiting component 7 are firstly connected with the hanging support 10 and then connected with the front vertical plate and the rear vertical plate of the movable frame 8, during the centering, the coaxiality requirement of the movable frame 8 and the centering hole on the bearing pier 4 is ensured, during the centering, the machining tolerance of the movable frame 8 can be ensured to be within the requirement by means of a centering rod which is a specially machined shaft-shaped component, or the movable frame 8 is finished by means of external equipment, the rack is provided with a centering hole so as to facilitate centering, and the centering aim is to ensure that the force measuring component 5 and the engine 12 are on the same axis, so that the thrust generated by the engine is transmitted along the axis and component forces in other directions are not generated; then, the force measuring assembly 5, the calibration assembly 9 and the mechanical force application device 3 are axially arranged, and finally, the tested engine 12 is arranged; after the device is installed, the calibration work of the high-precision sensor 15 is carried out before the test, and the purpose of the calibration is to eliminate the external force interference of the rack and ensure the accuracy of the thrust test. When the calibration is performed, the limit rod of the safety limit assembly 7 is opened, at the moment, the axial force is completely borne by the plate spring 6, the pre-tightening ejector rod is adjusted, the pre-tightening spring is compressed, the indication value of the force transducer is 2% -5% of the maximum measurement range, the purpose is to eliminate the influence of the 0 point of the transducer, and then the mechanical force applying device 3 and the calibration assembly 9 are combined to act, so that the calibration of the high-precision transducer 15 is completed according to the detection data of the calibration transducer 19; during the test, the hand wheel 23 on the hand-operated linear sliding table 26 is used for completely disconnecting the calibrating device from the test system, so that the thrust of the tested engine can be completely transmitted to the high-precision sensor 15, then the engine is ignited for the test, and the test data is recorded through the data acquisition system, so that the test of the engine is completed.
Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
While the invention is susceptible of embodiments in accordance with the preferred embodiments, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a little push away engine high accuracy leaf spring test device, includes engine (12), its characterized in that: the device also comprises a fixed frame, a mechanical stress application device (3), a force measurement assembly (5), a calibration assembly (9) and a hanging type plate spring structure, wherein the mechanical stress application device (3) and the hanging type plate spring structure are respectively connected to two ends of the upper surface of the fixed frame; the hanging type plate spring structure comprises a plate spring (6), a limiting component (7), a movable frame (8) and a hanging support (10), wherein the bottom of the hanging support (10) is connected to the fixed frame; the movable frame (8) is connected in the hanging support (10) through the plate spring (6) and the limiting component (7); one end of the plate spring (6) is connected to the hanging support (10), and the other end is connected with the movable frame (8); one end of the limiting component (7) is connected to the hanging support (10), and the other end is connected with the movable frame (8); the force measuring assembly (5) is arranged between the mechanical force applying device (3) and the movable frame (8), one end of the force measuring assembly (5) is connected to the fixed frame, and the other end of the force measuring assembly (5) is connected to the movable frame (8); one end of the calibration assembly (9) is connected with the fixed frame, and the other end of the calibration assembly (9) is connected with the movable frame (8); the engine (12) is connected to the outer side end of the movable frame (8) and is positioned on the opposite side of the force measuring assembly (5).
2. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the hanging support (10) comprises a front hanging support frame (20) and a rear hanging support frame (18); the front hanging support frame (20) and the rear hanging support frame (18) are connected to one side of the upper surface of the fixed frame in parallel and vertically, and the projection of the support frame (20) and the rear hanging support frame (18) on the fixed frame is perpendicular to the axis of the fixed frame.
3. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the movable frame (8) comprises a dowel bar (29), a movable frame front force plate (28) and a movable frame rear force plate (30); the movable frame front force plate (28) and the movable frame rear force plate (30) are relatively arranged in parallel, and the movable frame front force plate (28) and the movable frame rear force plate (30) are connected into a frame structure through a parallel dowel bar (29);
the upper ends of the outer side walls of the movable frame front force plate (28) and the movable frame rear force plate (30) are respectively provided with a horizontal through groove (8-1); the front side of the movable frame front force plate (28) is connected with the force measuring assembly (5); the rear side of the movable frame front force plate (28) is connected with the calibration assembly (9); the plate springs (6) are provided with two plates; the upper ends of the two leaf springs (6) are respectively arranged in the middle of the upper ends of the outer side surfaces of the front supporting frame (20) and the rear supporting frame (18), and the lower ends of the two leaf springs are respectively connected with the middle of a through groove (8-1) of the movable frame front force plate (28) and the movable frame rear force plate (30); the limiting component (7) is arranged around the movable frame front force plate (28) and the movable frame rear force plate (30).
4. A high-precision leaf spring test device for a micro-thrust engine as claimed in claim 3, wherein: the movable frame front force plate (28) and the movable frame rear force plate (30) are rectangular, four dowel bars (29) are arranged, and the dowel bars (29) are connected to four corners of the movable frame front force plate (28) and the movable frame rear force plate (30) in parallel.
5. A high-precision leaf spring test device for a micro-thrust engine as claimed in claim 3, wherein: the limiting assembly (7) comprises eight vertical limiting rods and eight lateral limiting rods; four vertical limiting rods and four lateral limiting rods are respectively arranged around the movable frame front force plate (28) and the movable frame rear force plate (30); two vertical limiting rods are oppositely arranged at the upper end and the lower end of the movable frame front force plate (28) respectively, one end of each vertical limiting rod is connected with the front hanging support frame (20), and the other end of each vertical limiting rod is connected with the movable frame front force plate (28); two sides of the movable frame front force plate (28) are respectively and oppositely provided with two lateral limiting rods, one end of each lateral limiting rod is connected with the front hanging support frame (20), and the other end of each lateral limiting rod is connected with two sides of the front force plate (28); two vertical limiting rods are correspondingly arranged at the upper end and the lower end of the movable frame rear force plate (30) respectively, one end of each vertical limiting rod is connected with the rear hanging support frame (18) respectively, and the other end of each vertical limiting rod is connected with the movable frame rear force plate (30) respectively; two sides of the movable frame rear force plate (30) are respectively and correspondingly provided with two lateral limiting rods, one end of each lateral limiting rod is respectively connected with the rear hanging support frame (18), and the other end of each lateral limiting rod is connected to the movable frame rear force plate (30).
6. A high-precision leaf spring test device for a micro-thrust engine as claimed in claim 3, wherein: the middle position of the lower ends of the front side and the rear side of the movable frame front force plate (28) is connected with a pre-tightening force assembly (11), the pre-tightening force assembly (11) comprises two groups, each pre-tightening force assembly comprises a pre-tightening spring (11-1), a pre-tightening ejector rod (11-2) and a support (11-3), the support (11-3) is connected to a fixed frame, the pre-tightening ejector rods (11-2) are parallel to the axis of the fixed frame, one end of each pre-tightening ejector rod is vertically connected to the support (11-3), the other end of each pre-tightening ejector rod is connected with the pre-tightening spring (11-1), and the two pre-tightening springs (11-1) are respectively propped against the two sides of the movable frame front force plate (28).
7. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the calibration assembly (9) comprises a calibration sensor (19), a calibration sensor seat (34), a calibration adapter (22), a calibration front beam (13), a calibration rear beam (16) and two calibration pull rods (21); the front calibration beam (13) and the rear calibration beam (16) are arranged in parallel; the two calibration pull rods (21) are connected to the fixed frame, the two calibration pull rods (21) are arranged in parallel, and two ends of each calibration pull rod (21) are respectively connected to the calibration front cross beam (13) and the calibration rear cross beam (16); one end of the calibration adapter (22) is connected with the mechanical stress application device (3), and the other end of the calibration adapter (22) is connected with the middle part of the calibration front cross beam (13); the calibration sensor (19) is connected to the movable frame (8) through a seat (34).
8. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the fixed frame comprises a fixed frame platform (1), a heightening seat (2) and a bearing pier (4); the fixed frame platform (1) is of a box type structure, the heightening seat (2) is connected to one end of the upper surface of the platform (1), and the mechanical stress application device (3) is connected to the heightening seat (2); the bearing pier (4) is connected to the fixed frame platform (1) and is arranged between the mechanical stress application device (3) and the hanging support (10); the middle position of the bearing pier (4) is provided with a centering hole, two sides of the centering hole are respectively provided with a side hole, one end of the force measuring component (5) is connected in the centering hole, and the calibration component (9) penetrates through the two side holes.
9. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the mechanical stress application device (3) at least comprises a hand wheel (23), a planetary reducer (24), a mechanical stress application bearing assembly (25) and a linear sliding table (26); the hand wheel (23) is connected to the end part of the mechanical stress bearing assembly (25) through a planetary reducer (24), and the linear sliding table (26) is connected to the lower part of the mechanical stress bearing assembly (25); a telescopic rod (27) for connecting the calibration assembly (9) is connected to the central axis of the mechanical stress bearing assembly (25).
10. The high-precision leaf spring test device of the micro-thrust engine as claimed in claim 1, wherein: the force measuring assembly (5) is horizontally arranged along the axial direction; the force measuring assembly (5) comprises a high-precision sensor (15), a sensor seat (14), a pressure head (32) and a force transmission ejector rod (31); the force transmission ejector rod (31) is connected to the fixed frame, and the high-precision sensor (15) is connected to the movable frame (8) through the sensor seat (14) and is positioned at the inner side end of the movable frame (8); the top end of the high-precision sensor (15) is provided with a pressure head (32), and the pressure head (32) is in point contact with the force transmission ejector rod (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311863101.7A CN117890116A (en) | 2023-12-29 | 2023-12-29 | High-precision plate spring test device of micro-thrust engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311863101.7A CN117890116A (en) | 2023-12-29 | 2023-12-29 | High-precision plate spring test device of micro-thrust engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117890116A true CN117890116A (en) | 2024-04-16 |
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ID=90643822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311863101.7A Pending CN117890116A (en) | 2023-12-29 | 2023-12-29 | High-precision plate spring test device of micro-thrust engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117890116A (en) |
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2023
- 2023-12-29 CN CN202311863101.7A patent/CN117890116A/en active Pending
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