CN214577442U - Low-friction buoyancy thrust adapter for rocket test - Google Patents

Abstract

The utility model discloses a rocket is experimental with low friction buoyancy thrust adapter, including the thrust plate that floats and to its supporting component who carries out the floating bearing, the supporting component includes single plunger jar, and the overhanging end terminal surface A of piston rod of single plunger jar is provided with end face seal circle between terminal surface A and face A through the face A contact of lubricated fluid with the thrust plate that floats. The utility model discloses realize the axial required axial support load when experimental based on single plunger jar; meanwhile, the floating thrust plate and the piston rod are divided to be mutually independent, and then the floating thrust plate is independent of the outside of the oil cavity, so that no matter how the floating thrust plate floats along with the change of the center of the engine, the position change of the floating thrust plate does not influence the space in the oil cavity, the space in the oil cavity is fixed, a complex oil way does not need to be configured, the processing cost of the thrust adapter is reduced, the later maintenance convenience is improved, and the test condition with extremely high sealing requirement, namely instantaneous high pressure, does not exist.

Description

Low-friction buoyancy thrust adapter for rocket test

Technical Field

The utility model relates to a rocket technical field, concretely relates to rocket is low friction buoyancy thrust adapter for experiment.

Background

The ground ignition test of the rocket engine has the function of testing the transient thrust, the pressure of a combustion chamber and other important parameters of the rocket engine, is one of the main modes of performance identification and design improvement of the rocket engine, and has important significance for the inspection of rocket engine products and the development of new models. When the supporting device of the existing engine thrust test bed adopts a fixed mechanical structure, the internal friction is large, and the testing precision of various parameters of the engine is reduced; moreover, after the engine is ignited, the housing of the engine expands due to heat, the center of the housing moves upwards along with the expansion of the housing, and the center of the supporting device does not change, so that a position difference is generated between the center of the rocket and the center of the supporting device after the rocket is ignited, and further, the mechanical connection part between the head of the rocket and the supporting device is lifted due to the expansion and the center of the engine, and the center of the supporting device does not change, so that great stress is accumulated, and the measurement of the thrust of the engine is not facilitated. And after the supporting device receives the thrust from the engine, the flexible piece is pressed and deformed, a return thrust can be generated on the engine, the flexible piece is easy to crack due to overlarge thrust of the engine, and even has a cracking risk, so that not only can a potential safety hazard be generated, but also the precision of testing various parameters of the engine is further reduced. Meanwhile, in practical use, the supporting device with the mechanical structure is only suitable for engine thrust tests of small rockets, and is a conventional 500-ton rocket. When 1500 tons of rockets are tested, three groups of flexible parts are needed, so that the size of the supporting device is increased, the testing cost is increased, and the testing error is increased.

Based on the above technical problems, CN210400854U discloses a buoyancy-type thrust adapter, one end of which is fixed on a thrust wall, and the other end of which forms a floating thrust plate capable of floating upward by fluid contact, and contacts with the end of an engine through the floating thrust plate, so that after the subsequent engine is ignited, when a rocket case expands due to heating and moves up at the center, the floating thrust plate floats and moves up in the fluid. In the whole testing process, the floating thrust plate can be adjusted in a self-adaptive mode according to the actual central position of the engine, stress concentration caused by dislocation of a connecting part between the head of the rocket and the supporting device is avoided, the quality of the connecting part between the head of the rocket and the supporting device is protected, friction force is reduced, and the testing precision of various parameters of the engine is improved.

However, in this buoyancy-type thrust adapter, one end of the floating thrust plate is installed as a piston rod in the inner cavity of the connecting piece serving as the cylinder barrel, an annular space is formed between the circumferential surface of the piston rod and the circumferential surface of the inner cavity, and as the floating thrust plate floats up and down in the radial direction and moves axially, the change in the volume of the space between the piston rod and the inner cavity is large. The arrangement of an oil inlet and outlet way on the connecting piece is increased, and the manufacturing cost and the maintenance cost are increased; and when the volume of the space between the piston rod and the inner cavity is reduced, the pressure intensity of the fluid in the space is increased, so that the requirement on the sealing performance of the space is extremely high, and the sealing cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the low-friction buoyancy thrust adapter for the rocket test solves the technical problems that an existing low-friction center-adjustable floating thrust adapter needs to be provided with a complex oil way, is high in machining cost, troublesome to maintain, extremely high in sealing requirement and the like.

The utility model adopts the technical scheme as follows:

the low-friction buoyancy thrust adapter for the rocket test comprises a floating thrust plate and a supporting assembly for carrying out radial and axial floating supporting on the floating thrust plate, wherein the supporting assembly comprises a single plunger cylinder, one end face A, extending out of an oil cavity of a cylinder barrel of the single plunger cylinder, of a piston rod of the single plunger cylinder is in contact with one side plate face A of the floating thrust plate through lubricating fluid, and an end face sealing ring for preventing the lubricating fluid between the end face A and the plate face A from overflowing is arranged between the end face A and the plate face A.

Furthermore, an exhaust duct for communicating the space sealed by the inner ring of the end face sealing ring with the outside is arranged on the floating thrust plate, and a sealing plug for plugging the end part of the exhaust duct is arranged at one end of the exhaust duct communicated with the outside.

Furthermore, one end of the exhaust duct is communicated with the plate surface A, and the other end of the exhaust duct is communicated with the circumferential surface of the floating thrust plate.

Furthermore, a limiting block is arranged on the upper side of the side wall of the piston rod, and the upper side of the side wall of the limiting block, which is close to the floating thrust plate, protrudes outwards to form a limiting step which is opposite to the floating thrust plate in the radial direction.

Furthermore, the limiting block is of an arc-shaped strip structure, the circle center of the limiting block is located on the axis of the piston rod, the inner circumferential surface of the limiting block is attached to the outer circumferential surface of the piston rod, and the limiting block is installed on the piston rod through an upper bolt.

Furthermore, a supporting block is installed on the lower side of the side wall of the piston rod, and the upper side of the side wall of the supporting block close to the floating thrust plate protrudes outwards to form a supporting step which is opposite to the floating thrust plate in the radial direction.

Furthermore, the supporting block is of an arc-shaped strip structure, the circle center of the supporting block is located on the axis of the piston rod, the inner circumferential surface of the supporting block is attached to the outer circumferential surface of the piston rod, and the supporting block is installed on the piston rod through a lower bolt.

Furthermore, a dust cover sleeved on the extending end of the piston rod is arranged between the end face of the cylinder barrel close to the floating thrust plate and the plate face A, and two ends of the dust cover are respectively in contact with the end face of the cylinder barrel and the plate face A.

Further, the closed end of the cylinder barrel is provided with a spherical groove, a posture adjusting assembly is installed in the spherical groove, the center line of the spherical groove coincides with the axis of the single plunger cylinder, the posture adjusting assembly comprises a posture adjusting ball head, a posture adjusting gasket and a posture adjusting screw, one side of the posture adjusting ball head is a plane and is positioned outside the spherical groove, the other side of the posture adjusting ball head protrudes outwards to form a convex spherical surface which is attached to the concave spherical surface of the spherical groove, the rod part of the posture adjusting screw penetrates through the posture adjusting gasket and the posture adjusting ball head and then is in threaded connection with the closed end of the cylinder barrel, and the posture adjusting ball head is in clearance fit with the posture adjusting screw.

Further, the lubricating fluid is grease.

Due to the adoption of the technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses low friction buoyancy thrust adapter for rocket test, creatively cut apart floating thrust plate and piston rod, the utility model discloses realize the axial required axial support load when testing based on single plunger jar and piston rod cooperation; meanwhile, floating is realized by a floating thrust plate which is independent from the piston rod and is floated at the extending end of the piston rod by lubricating fluid so as to be matched with the center of the engine to move upwards, ensure that the structure height is matched with the structure change of the engine and keep low friction force; meanwhile, the floating is independent of the outside of the oil cavity, so that no matter how the floating thrust plate floats along with the change of the center of the engine, the position change of the floating thrust plate does not influence the space in the oil cavity, and the space in the oil cavity is constant, so that a complex oil way does not need to be configured, the processing cost of the thrust adapter is reduced, the later maintenance convenience is improved, and the test condition with extremely high sealing requirement, namely instantaneous high pressure, does not exist;

2. the utility model discloses low friction buoyancy thrust adapter for rocket test, the gas between terminal surface A and face A discharges through the exhaust duct to reduce or even eliminate the gas between terminal surface A and face A, reduce the frictional force between terminal surface A and the face A then, be convenient for each parameter acquisition of engine;

3. the arrangement of the low-friction buoyancy thrust adapter posture adjusting assembly for the rocket test is convenient for eliminating installation errors and ensuring the centrality and the like when the thrust adapter is installed, thereby being beneficial to subsequent tests;

4. compared with the prior art, the low-friction buoyancy thrust adapter for the rocket test is an integral piece of the single plunger cylinder, so that the strength of the single plunger cylinder can be improved on the premise of low cost, and the load borne by the single plunger cylinder can be improved; meanwhile, the assembly is not needed, the assembly step is omitted, and the manufacturing cost is reduced; in addition, the sealing ring and the dust ring are arranged on the circumferential surface of the oil cavity, and then the piston rod is directly inserted into the oil cavity, so that the assembly is simple, the assembly efficiency is high, the assembly process of the thrust adapter is greatly improved, and the original multiple assembly steps are simplified;

5. the utility model discloses rocket is experimental with low friction buoyancy thrust adapter, the conventional floating setting in this field is and adopts lubricating oil to carry out the bearing that floats. However, how to further reduce the floating friction of the floating thrust plate needs to break through the conventional means, and an unconventional conceivable lubricating fluid is used as the floating support fluid of the floating thrust plate, according to the following test, the friction coefficient of the lubricating grease is obviously less than that of the lubricating oil, and the lubricating grease is used for carrying out the fluid support of the floating thrust plate, so that the floating friction of the floating thrust plate can be further reduced, the acquisition of various parameters of the engine is facilitated, the acquisition accuracy is improved, and the interference caused by the friction is reduced.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the proportional relationship of each component in the drawings in this specification does not represent the proportional relationship in the actual material selection design, and it is only a schematic diagram of the structure or the position, in which:

fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an installation schematic diagram of a stop block;

FIG. 3 is a schematic view of the mounting of the support block;

FIG. 4 is a schematic structural diagram of a stopper;

fig. 5 is a schematic view of the fit between the piston rod and the cylinder barrel.

Reference numerals in the drawings indicate:

1-cylinder barrel, 2-piston rod, 3-limiting block, 301-limiting step, 4-dustproof cover, 5-floating thrust plate, 6-supporting block, 601-supporting step, 7-positioning sleeve, 8-posture adjusting top, 9-posture adjusting gasket, 10-posture adjusting screw, 11-spherical gasket, 12-conical gasket, 13-first rod seal, 14-second rod seal, 15-dustproof ring, 16-upper screw, 17-upper gasket, 18-outer end surface seal ring, 19-dustproof cover mounting bolt, 20-middle end surface seal ring, 21-inner auxiliary bolt, 22-inner auxiliary gasket, 23-inner end surface seal ring, 24-lower bolt, 25-lifting ring screw, 26-copper support, 27-sealing plug, 28-stay wire sensor, 29-outer auxiliary bolt, 30-exhaust duct, 31-spherical groove, 32-lower washer and 33-countersunk bolt hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention.

The present invention will be described in detail with reference to fig. 1 to 5.

Example 1

As shown in fig. 1-3, the utility model discloses rocket test is with low friction buoyancy thrust adapter, including floating thrust plate 5 and to its supporting component who carries out radial and axial floating bearing, supporting component includes single plunger jar, the one end terminal surface A of the oil pocket of the cylinder 1 of the piston rod 2 outer extension single plunger jar of single plunger jar passes through lubricating fluid and one side face A contact of floating thrust plate 5, and is provided with between terminal surface A and face A and prevents the excessive end face seal circle of lubricating fluid between it. An oil film surface is formed between the end surface A and the plate surface A.

The end face sealing rings are preferably end face GREEN rings, and the number of the end face sealing rings is three, namely an inner end face sealing ring 23, a middle end face sealing ring 20 and an outer end face sealing ring 18 from inside to outside.

The lubricating fluid may be a lubricating fluid, grease, or the like.

Will the utility model is used for during the rocket engine is experimental, fix the bottom of cylinder 1 on the thrust wall, its other end passes through the distance frame bulb subassembly and is connected with the link of engine. The engine is ignited, and oil is supplied to an oil cavity of the single plunger cylinder through the large oil cylinder so as to match the axial thrust of the engine; meanwhile, when the central line of the engine moves upwards due to thermal expansion, the floating thrust plate 5 is synchronously adjusted along with the actual central position of the engine, so that the test precision of various parameters of the engine is ensured conveniently.

Compared with the prior art, the utility model designs a brand-new buoyancy thrust adapter, creatively cuts apart the floating thrust plate and the piston rod, and realizes the axial required axial supporting load during the test based on the cooperation of the single plunger cylinder and the piston rod; meanwhile, floating is realized by a floating thrust plate 5 which is independent from the piston rod and is floated at the extending end of the piston rod by lubricating fluid so as to be matched with the center of the engine to move upwards, ensure that the structure height is matched with the structure change of the engine and keep low friction force; meanwhile, the floating is independent of the outside of the oil cavity, so that no matter how the floating thrust plate floats along with the change of the center of the engine, the position change of the floating thrust plate does not influence the space in the oil cavity, the space in the oil cavity is constant, a complex oil way does not need to be configured, the processing cost of the thrust adapter is reduced, the later maintenance convenience is improved, and the test condition with extremely high sealing requirement, namely instantaneous high pressure, does not exist.

And simultaneously, the utility model discloses in, it is independent with floating plate and piston rod to make float and only realize based on the lubricating fluid between floating plate and the piston rod, thereby need not to set up the oil pocket and supply the piston rod to float, thereby simplified single-plunger cylinder structure, need not to adopt the multicomponent to splice out the steel body that the opening is less than the oil pocket, reduced manufacturing cost.

Example 2

In this example, the oil film surface is further described based on example 1.

When coating lubricating fluid between terminal surface A and face A, can't guarantee that the lubricating fluid surface is smooth plane, consequently at terminal surface A and/or face A coating lubricating fluid, install one side at the terminal surface A of piston rod with floating thrust plate 5 again, so that terminal surface A passes through lubricating fluid and when floating thrust plate 5's one side face A contact, the contact surface is incomplete smooth plane because of the lubricating fluid surface between it, consequently terminal surface A and face A pass through when lubricating fluid contacts, there is the air between it, the air can increase the frictional force between terminal surface A and the face A, be unfavorable for each parameter acquisition of engine, consequently adopt following structure:

as shown in fig. 1, the floating thrust plate 5 is provided with an exhaust duct 30 for communicating a space sealed by an inner ring of the end face seal ring with the outside, and a seal plug 27 for plugging an end portion of the exhaust duct 30 at one end communicating with the outside is provided.

Further, one end of the exhaust duct 30 communicates with the plate surface a, and the other end thereof communicates with the circumferential surface of the floating thrust plate 5.

The floating thrust plate 5 is mounted as follows: s1, coating lubricating fluid on the end face A and/or the plate face A; s2, arranging the floating thrust plate 5 on one side of the end surface A, wherein the end surface A is contacted with the plate surface A through lubricating fluid; s3, fixing the floating thrust plate 5 and the single plunger cylinder, and supplying oil to the single plunger cylinder to enable the piston rod to extend outwards, so that the axial extrusion force between the piston rod and the floating thrust plate 5 is increased, and then the gas between the end surface A and the plate surface A is discharged through the exhaust duct 30, so that the gas between the end surface A and the plate surface A is reduced or even eliminated, the friction force between the end surface A and the plate surface A is reduced, and the acquisition of various parameters of the engine is facilitated; s4, the end of the discharge port 30 communicating with the outside is then sealed by the seal plug 27.

Example 3

The floating restriction of the floating plate is specifically performed as follows:

as shown in fig. 1 and 2, a limit block 3 is mounted on the upper side of the side wall of the piston rod 2, and the upper side of the side wall of the limit block 3 close to the floating thrust plate 5 protrudes outward to form a limit step 301 which is radially opposite to the floating thrust plate 5.

The minimum distance between the limiting step 301 and the floating thrust plate 5 in the vertical direction is the maximum distance that the floating thrust plate 5 can move in the vertical direction; the arrangement of the limiting step 301 limits the floatable stroke of the floating thrust plate 5, and prevents the floating thrust plate 5 from slipping from the end surface A of the piston rod, so that the sealing performance between the end surface A and the surface A is ensured, and the rocket launcher is ensured to be tested smoothly.

Further, as shown in fig. 4, the limiting block 3 is an arc-shaped strip structure, the center of the arc-shaped strip structure is located on the axis of the piston rod 2, the inner circumferential surface of the arc-shaped strip structure is attached to the outer circumferential surface of the piston rod 2, and the arc-shaped strip structure is mounted on the piston rod 2 through an upper bolt 16. The upper bolt 16 is preferably a countersunk bolt, and as shown in fig. 2, an upper washer 17 is sleeved on the upper bolt 16 to prevent the upper bolt from loosening.

Example 4

The gravity support for the floating thrust plate 5 is embodied as follows: as shown in fig. 1 and 3, a support block 6 is installed at a lower side of a side wall of the piston rod 2, and an upper side of the side wall of the support block 6 adjacent to the floating thrust plate 5 is protruded to form a support step 601 radially opposite to the floating thrust plate 5.

Further, the supporting block 6 is an arc-shaped strip structure, the circle center of the supporting block is located on the axis of the piston rod 2, the inner circumferential surface of the supporting block is attached to the outer circumferential surface of the piston rod 2, and the supporting block is mounted on the piston rod 2 through a lower bolt 24.

The lower bolt 24 is preferably a countersunk bolt, and as shown in fig. 3, a lower washer is sleeved on the lower bolt 24 to prevent the lower bolt 24 from being loosened.

Example 5

In order to prevent dust from entering between the end face A and the plate face A, a dust cover 4 sleeved on the extending end of the piston rod 2 is arranged between the end face of the cylinder barrel 1 close to the floating thrust plate 5 and the plate face A, and two ends of the dust cover 4 are respectively contacted with the end face of the cylinder barrel 1 and the plate face A.

The dust cover 4 covers the limiting block 3 and the supporting block 6 in the inner part, the dust cover is preferably a corrugated pipe, two ends of the dust cover protrude outwards to form an outwards-turned edge, and a dust cover mounting bolt 19 penetrates through the outwards-turned edge and then is connected with the cylinder barrel or the floating thrust plate.

Example 6

As the test is carried out, better test parameters can be obtained due to higher verticality, straightness and planeness. During actual installation, the installation position of the actually assembled thrust adapter needs to be adjusted by a relatively fixed thrust wall, so that a spherical groove 31 is formed in the closed end of the cylinder barrel 1, a posture adjusting assembly is installed in the spherical groove 31, the center line of the spherical groove 31 is overlapped with the axis of the single-plunger cylinder, the posture adjusting assembly comprises a posture adjusting ball 8, a posture adjusting gasket 9 and a posture adjusting screw 10, one side of the posture adjusting ball 8 is a plane and is positioned outside the spherical groove 31, the other side of the posture adjusting ball protrudes outwards to form a convex spherical surface which is attached to the concave spherical surface of the spherical groove 31, the rod part of the posture adjusting screw 10 penetrates through the posture adjusting gasket 9 and the posture adjusting ball 8 and then is in threaded connection with the closed end of the cylinder barrel 1, and the posture adjusting ball 8 is in clearance fit with the posture adjusting screw 10.

When the arrangement of the posture adjusting assembly is convenient for installing the thrust adapter, installation errors are eliminated, the centrality is ensured, and the like, so that the subsequent test is facilitated.

Example 7

For ease of lifting, a plurality of eye screws 25 are preferably mounted on the outer circumferential surface of the cylinder tube 1. In order to collect the pressure information inside the oil chamber, a pressure measuring port is preferably arranged on the outer circumferential surface of the cylinder barrel 1, a pressure sensor is installed in the pressure measuring port, and the pressure sensor collects the pressure change of the oil chamber; and a displacement sensor is arranged between the floating thrust plate and the piston rod to detect the thickness of an oil film surface between the floating thrust plate and the piston rod. And simultaneously, in order to improve the utility model discloses the assembly convenience, it is fixed with the thrust plate 5 and the piston rod connection that float to adopt interior auxiliary bolt 21 preferably, and it is fixed with the cylinder connection that the thrust plate 5 floats to adopt outer auxiliary bolt 29. After the assembly, when the gas between the floating thrust plate and the piston rod needs to be discharged, the cylinder barrel is fixed, then the floating thrust plate 5 is fixed, then the inner auxiliary bolt 21 and the outer auxiliary bolt 29 are detached, then the oil cavity is supplied with oil, so that the matching surface between the piston rod and the floating thrust plate is extruded by the outward extension of the piston rod, and then the gas between the piston rod and the floating thrust plate is discharged.

One side of the outer circumferential surface of the cylinder barrel 1 protrudes outwards to form an outwards-turned edge, one side of the outer circumferential surface of the floating thrust plate 5 protrudes outwards to form an outwards-turned edge, and the tail end of the rod part of the outer auxiliary bolt 29 penetrates through the outwards-turned edge of the floating thrust plate 5 and then is in threaded connection with the outwards-turned edge of the cylinder barrel 1.

The outer circumferential surface of the piston rod is positioned on one side outside the oil cavity and protrudes outwards to form an outwards turned edge, the tail end of the rod part of the inner auxiliary bolt 21 penetrates through the plate body of the floating thrust plate 5 and then is in threaded connection with the outwards turned edge of the piston rod, and the limiting block and the supporting block are both arranged on the outwards turned edge of the piston rod.

Example 8

The utility model discloses in, as shown in fig. 1, single plunger jar does not have the cylinder cap, and single plunger jar carries out the oil pocket and external sealed through the sealing assembly between 2 outer circumferences of piston rod and the interior circumference of cylinder 1, and sealing assembly includes and installs first sealing washer 13, second sealing washer 14 and dust ring 15 on the interior circumference of cylinder 1 in proper order to the overhanging end of piston rod by the cylinder bottom, as shown in fig. 1 and fig. 5.

Compared with the prior art, the single plunger cylinder in the utility model is an integral piece, which can improve the strength of the single plunger cylinder and the load born by the single plunger cylinder on the premise of low cost; meanwhile, the assembly is not needed, the assembly step is omitted, and the manufacturing cost is reduced; and the sealing ring and the dust ring are arranged on the circumferential surface of the oil cavity, and then the piston rod is directly inserted into the oil cavity, so that the assembly is simple, the assembly efficiency is high, the assembly process of the thrust adapter is greatly improved, and the original various assembly steps are simplified.

Further, in order to improve the assembly convenience and the coaxiality of the piston rod and the cylinder barrel, copper supports 26 sleeved on the piston rod are arranged on the two sides of the first sealing ring 13 and between the second sealing rings 14 and the dust rings 15.

Example 9

When the floating thrust adapter is designed, the floating support is carried out by adopting lubricating oil based on the conventional floating arrangement in the field. However, how to further reduce the floating friction of the floating thrust plate needs to break through the conventional means, and an unconventional conceivable lubricating fluid is used as the floating support fluid of the floating thrust plate, according to the following test, the friction coefficient of the lubricating grease is obviously less than that of the lubricating oil, and the lubricating grease is used for carrying out the fluid support of the floating thrust plate, so that the floating friction of the floating thrust plate can be further reduced, the acquisition of various parameters of the engine is facilitated, the acquisition accuracy is improved, and the interference caused by the friction is reduced.

Experimental analysis of the friction forces for different lubrication fluids between the floating thrust plate 5 and the piston rod is as follows:

a actual test conditions:

ambient temperature: the temperature is between +10 ℃ and +23 ℃;

air humidity: about 92 percent;

ground wind speed: breeze;

instantaneous wind speed: breeze is slight.

B, lubricating fluid: grease and lubricating oil

C, test process:

(1) after the floating thrust plate 5 and the piston rod are assembled according to the assembly requirement, the assembled floating thrust plate and the piston rod are placed on a test platform, lubricating grease is smeared between the floating thrust plate and the test platform, and radial load is applied to the floating thrust plate, so that the obtained friction coefficients are as follows:

table 1 grease loading test data

Loading load (t)	Hydraulic cylinder big cavity working pressure/thrust (MPa/kg)	Hydraulic cylinder small cavity working pressure/pulling force (MPa/kg)	Distance of floating thrust plate (mm)	Coefficient of friction push/pull
					100	0.2/307	4.2/4352	50	0.030/0.043
300	2/3007	5.5/5699	50	0.010/0.019
					400	2/3007	3.5/3626	50	0.010/0.009
500	3/4616	6.2/6424	50	0.009/0.012
					600	3.8/5846	6/6217	50	0.009/0.010

(2) After being assembled according to the assembly requirement, the floating thrust plate 5 and the piston rod are placed on a test platform, lubricating oil is smeared between the floating thrust plate and the test platform, and radial load is applied to the floating thrust plate, so that the obtained friction coefficients are as follows:

TABLE 2 lubricating oil loading test data

Loading load (t)	Hydraulic cylinder big cavity working pressure/thrust (MPa/kg)	Hydraulic cylinder small cavity working pressure/pulling force (MPa/kg)	Distance of floating thrust plate (mm)	Coefficient of friction push/pull
					100	5/7693	8/8289	50	0.076/0.088
200	8/12308	12/12434	50	0.061/0.062
					300	9/13847	14/14506	50	0.046/0.048
400	11～12/16924～18463	18/18651	50	0.042～0.046/0.047
					500	14～15/21540～23709	20～21/20724～21760	50	0.043～0.047/0.041～0.043
600	16～17/24671～26156	24～26/24869～26941	50	0.041～0.043/0.041～0.045

Therefore, the friction coefficient of the lubricating grease is far smaller than that of the lubricating oil, the lubricating grease is adopted for fluid supporting of the floating thrust plate, the floating friction force of the floating thrust plate can be further reduced, various parameters of the engine can be conveniently acquired, the acquisition accuracy is improved, and the interference caused by the friction force is reduced.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Low friction buoyancy thrust adapter for rocket test, including floating thrust plate (5) and carry out radial and axial floating support's supporting component to it, its characterized in that: the supporting assembly comprises a single plunger cylinder, one end face A of a piston rod (2) of the single plunger cylinder, extending out of an oil cavity of a cylinder barrel (1) of the single plunger cylinder, is in contact with one side plate face A of the floating thrust plate (5) through lubricating fluid, and an end face sealing ring for preventing the lubricating fluid between the end face A and the plate face A from overflowing is arranged between the end face A and the plate face A.

2. A rocket test low-friction buoyancy thrust adapter according to claim 1, wherein: an exhaust duct (30) for communicating the space sealed by the inner ring of the end face sealing ring with the outside is arranged on the floating thrust plate (5), and a sealing plug (27) for plugging the end part of the exhaust duct (30) is arranged at one end communicated with the outside.

3. A rocket test low-friction buoyancy thrust adapter according to claim 2, wherein: one end of the exhaust duct (30) is communicated with the plate surface A, and the other end of the exhaust duct is communicated with the circumferential surface of the floating thrust plate (5).

4. A rocket test low-friction buoyancy thrust adapter according to claim 1, wherein: and the upper side of the side wall of the piston rod (2) is provided with a limiting block (3), and the upper side of the side wall of the limiting block (3) close to the floating thrust plate (5) is protruded outwards to form a limiting step (301) which is opposite to the floating thrust plate (5) in the radial direction.

5. A rocket test low-friction buoyancy thrust adapter according to claim 4, wherein: the limiting block (3) is of an arc-shaped strip structure, the circle center of the limiting block is located on the axis of the piston rod (2), the inner circumferential surface of the limiting block is attached to the outer circumferential surface of the piston rod (2), and the limiting block is installed on the piston rod (2) through an upper bolt (16).

6. A rocket test low-friction buoyancy thrust adapter according to claim 1, wherein: and a supporting block (6) is arranged on the lower side of the side wall of the piston rod (2), and the upper side of the side wall of the supporting block (6) close to the floating thrust plate (5) is protruded outwards to form a supporting step (601) which is opposite to the floating thrust plate (5) in the radial direction.

7. A rocket test low-friction buoyancy thrust adapter according to claim 6, wherein: the supporting block (6) is of an arc strip-shaped structure, the circle center of the supporting block is located on the axis of the piston rod (2), the inner circumferential surface of the supporting block is attached to the outer circumferential surface of the piston rod (2), and the supporting block is installed on the piston rod (2) through a lower bolt (24).

8. A low friction buoyancy thrust adapter for rocket tests according to any one of claims 1 to 7, wherein: and a dust cover (4) sleeved at the outward extending end of the piston rod (2) is arranged between the end surface of the cylinder barrel (1) close to the floating thrust plate (5) and the plate surface A, and two ends of the dust cover (4) are respectively contacted with the end surface of the cylinder barrel (1) and the plate surface A.

9. A low friction buoyancy thrust adapter for rocket tests according to any one of claims 1 to 7, wherein: the closed end of the cylinder barrel (1) is provided with a spherical groove (31), a posture adjusting component is installed in the spherical groove (31), the central line of the spherical groove (31) coincides with the axis of the single plunger cylinder, the posture adjusting component comprises a posture adjusting ball head (8), a posture adjusting gasket (9) and a posture adjusting screw (10), one side of the posture adjusting ball head (8) is a plane and is positioned on the outer side of the spherical groove (31), the other side of the posture adjusting ball head protrudes outwards to form a convex spherical surface which is attached to the concave spherical surface of the spherical groove (31), the rod part of the posture adjusting screw (10) penetrates through the posture adjusting gasket (9) and the posture adjusting ball head (8) and then is in threaded connection with the closed end of the cylinder barrel (1), and the posture adjusting ball head (8) is in clearance fit with the posture adjusting screw (10).

10. A low friction buoyancy thrust adapter for rocket tests according to any one of claims 1 to 7, wherein: the lubricating fluid is grease.

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