Rocket engine vertical thrust test bench

Abstract

The utility model discloses a vertical thrust test bench for a rocket engine, which comprises a bottom plate, and a push plate for embedding the bottom end of the engine is arranged at the center of the bottom plate; a plurality of stand columns are vertically and evenly installed on the bottom plate around the supporting base, and a plurality of sets of supporting assemblies used for limiting radial deviation of the engine are installed on each stand column from top to bottom. Each supporting assembly comprises a connecting body, and the rear end of each connecting body is arranged and fixed to the corresponding stand column in a sleeving mode. A supporting rod is installed at the front end of the connecting body, and a bearing with the rolling face abutting against an engine shell is arranged at the front end of the supporting rod. An extending hole is formed in the connecting body, a spring is arranged in the extending hole, and the rear end of the supporting rod is inserted into the extending hole and abuts against the spring; a limiting groove is formed in one side of the supporting rod, and a limiting screw with the tail end inserted into the limiting groove and used for limiting displacement and deviation of the supporting rod is screwed on the connecting body. According to the test bed, the engine can be quickly and effectively positioned, and the stability in the test process is ensured.

Description

Technical Field

[0001] This utility model relates to a vertical thrust test rig for rocket engines, belonging to the technical field of static thrust test technology for rocket engines. Background Technology

[0002] Currently, small rocket engine thrust test rigs include two types: vertical and horizontal. Most use a semi-circular half-support rod to fix the engine circumferentially. During operation, the distance from the support rod to the engine and the direction of the rolling bearings contacting the engine surface must be adjusted simultaneously. This often results in incorrect rolling bearing orientation, requiring repeated adjustments, which is very inconvenient when used with different engine specifications and models. Utility Model Content

[0003] The purpose of this utility model is to provide a vertical thrust test stand for rocket engines, used for static thrust testing of small solid rocket engines. It is used to fix the engine, and after the engine is ignited, the engine movement can be restricted in the circumferential direction so that its thrust acts vertically on the base plate. Through multiple sets of support components, the engine can be quickly and effectively positioned, and the displacement and offset of the support rod can be restricted by the combination of limit screws and limit grooves to ensure stability during the experiment. The operation is simple and convenient.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A vertical thrust test rig for a rocket engine includes a base plate with a push plate for embedding the engine at the center of the base plate; a number of columns are vertically and evenly installed on the base plate around a support base, and multiple sets of support components for limiting the radial displacement of the engine are detachably installed on each column from top to bottom.

[0006] Each set of support components includes a connector, the rear end of which is sleeved on the column and fixed by fasteners; the front end of the connector is equipped with a support rod facing the engine axis, and the front end of the support rod is equipped with a bearing whose rolling surface abuts against the engine housing.

[0007] An insertion hole is provided on the connecting body, and a spring is installed in the insertion hole. The rear end of the support rod is inserted into the insertion hole and abuts against the spring. A limit groove is provided on one side of the support rod, and a limit screw is screwed on the connecting body, the end of which is inserted into the limit groove to limit the displacement and offset of the support rod.

[0008] Preferably, a locking assembly for further limiting the displacement of the support rod is also installed at the front end of the connector;

[0009] The locking assembly comprises a fastening seat mounted at the front end of the connecting body, a sunken cavity with a gradually reduced inner diameter from outside to inside is formed in the fastening seat; a fastening sleeve is sleeved on the support rod, a plurality of embedding grooves which are communicated between the inside and outside of the fastening sleeve are arranged around the inner end of the fastening sleeve, and a rolling ball with a diameter larger than the depth of the embedding groove is embedded in each embedding groove;

[0010] A screw cover is sleeved at the outer end of the fastening sleeve and abuts against the stepped surface of the fastening sleeve, and a corresponding ring groove is formed between the fastening sleeve and the screw cover, and a snap ring is arranged in the ring groove;

[0011] The screw cover is threadedly connected with the fastening seat, in the process of screwing the screw cover into the fastening seat, the fastening sleeve is pushed and extends into the sunken cavity, and under the action of the inner diameter of the sunken cavity, the acting force between the rolling ball and the support rod is increased.

[0012] Preferably, the inner end of the fastening seat is embedded in the connecting body and is fixed by a fastening screw.

[0013] Preferably, at least one sliding groove extending in the axial direction is formed on the stand, the rear end of the connecting body is formed in a sleeve structure, the sleeve structure is sleeved on the stand, and a plurality of positioning keys are rotatably arranged on the sleeve structure, and the ends of the positioning keys are embedded in the corresponding sliding grooves.

[0014] Preferably, a plurality of support seats are uniformly arranged on the bottom plate around the support seat, and the bottom end of the stand is embedded in the support seat and fixedly connected with the support seat.

[0015] The beneficial effects of the utility model lie in:

[0016] 1. Safe and reliable: through a plurality of support assemblies, the engine is quickly and effectively positioned, and through the cooperation of the limiting screw and the limiting groove and the action of the locking assembly, the radial deviation of the engine is effectively limited, so that the engine remains stable during the test process.

[0017] 2. Wide application range: the position of the support assembly and the extension amount of the support rod can be freely adjusted, and the device is suitable for static thrust tests of small rocket engines of different specifications.

[0018] 3. Easy to operate: compared with the traditional engine thrust test bench, the device can quickly position and fix the engine, and is simple and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a front view of the thrust test bench;

[0020] Fig. 2 It is a top view of the thrust test bench (the thrust plate is omitted);

[0021] Fig. 3 It is a structural schematic view of the support assembly.

[0022] The meanings of the main reference signs in the drawings are as follows:

[0023] 1. Base plate, 2. Push plate, 3. Support base, 4. Column, 5. Support assembly, 6. Connector, 7. Slide groove, 8. Positioning key, 9. Support rod, 10. Bearing, 11. Spring, 12. Limiting groove, 13. Limiting screw, 14. Fastening base, 15. Fastening sleeve, 16. Ball bearing, 17. Screw cap, 18. Snap ring. Detailed Implementation

[0024] This embodiment provides a vertical thrust test rig for rocket engines, such as... Figs. 1-3 As shown, the system includes a base plate 1, with a push plate 2 positioned at its center. The push plate 2 has a groove. The rocket engine is vertically placed on the push plate 2, its bottom end embedded in the groove and moved to the center position of the push plate 2. Three support seats 3 are evenly installed around the base plate 1, and each support seat 3 has a vertically installed column 4. From top to bottom, two sets of support components 5 for limiting the radial displacement of the engine are detachably installed on each column 4. Fixing holes are provided at the four corners of the base plate 1, allowing the test platform to be fixed to the ground during testing.

[0025] Each support assembly 5 includes a connector 6, the rear end of which forms a sleeve structure. The sleeve structure is fitted onto the column 4 and fixed with fasteners. Simultaneously, an axially extending groove 7 is provided on the column 4, and a positioning key 8 (flat-head screw) is screwed onto the sleeve structure, with the end of the positioning key 8 embedded in the corresponding groove 7. A support rod 9 facing the engine axis is installed at the front end of the connector 6, and a bearing 10 with a rolling surface abutting against the engine housing is provided at the front end of the support rod 9. An insertion hole is provided on the connector 6, and a spring 11 is provided within the insertion hole. The rear end of the support rod 9 is inserted into the insertion hole and abuts against the spring 11. A limiting groove 12 is provided on one side of the support rod 9, and a limiting screw 13, whose end inserts into the limiting groove 12, is screwed onto the connector 6 to limit the displacement and offset of the support rod 9.

[0026] After loosening the positioning key 8 and fasteners, the position of the support assembly 5 can be adjusted to meet the limitations of rocket engines at different heights. After the rocket engine is placed on the push plate 2, first adjust the height of the support assembly 5, then tighten the positioning key 8 and the fasteners used to fix the sleeve structure and the column 4, and then loosen the limiting screw 13 (without disengaging it from the limiting groove 12). At this time, under the action of the spring 11, the support rod 9 will push outward and make the rolling surface of the bearing 10 abut against the engine casing. Since the limiting screw 13 does not disengage from the limiting groove 12, the support rod 9 will not rotate. Then tighten the limiting screw 13 to increase its force on the support rod 9 to prevent axial displacement of the support rod 9 during thrust testing.

[0027] In order to further improve the restriction effect on the rocket engine to prevent its radial displacement during the test, a locking assembly for further limiting the axial displacement of the support rod 9 is also installed at the front end of the connecting body 6; the locking assembly comprises a fastening seat 14 installed at the front end of the connecting body 6, a sunken cavity with a gradually reduced inner diameter from the outside to the inside is formed in the fastening seat 14; a fastening sleeve 15 is sleeved on the support rod 9, the inner end of the fastening seat 14 is embedded in the connecting body 6 and is fixed by fastening screws, a plurality of embedded grooves which are in communication with the inside and outside of the fastening sleeve 15 are arranged around the inner end of the fastening sleeve 15, a rolling ball 16 with a diameter larger than the depth of each embedded groove is embedded in each embedded groove; a screw cap 17 abutting against the stepped surface of the fastening sleeve 15 is sleeved on the outer end of the fastening sleeve 15, and a corresponding ring groove is formed between the fastening sleeve 15 and the screw cap 17, and a snap ring 18 is arranged in the ring groove (the existence of the snap ring 18 makes the fastening sleeve 15 and the screw cap 17 be regarded as an integral structure); the screw cap 17 is threadedly connected with the fastening seat 14, during the screwing of the screw cap 17 into the fastening seat 14, the fastening sleeve 15 is pushed and extends into the sunken cavity, and under the action of the inner diameter of the sunken cavity, the acting force between the rolling ball 16 and the support rod 9 is increased.

[0028] In the presence of the locking assembly, when the rocket engine is placed on the push plate 2 for thrust test, the height of the support assembly 5 is first adjusted, then the positioning key 8 and the fastener for fixing the sleeve structure and the stand 4 are tightened, the limiting screw 13 is loosened (without being separated from the limiting groove 12) and the screw cap 17 is rotated outward, the screw cap 17 will drive the fastening seat 14 to displace outward during the outward rotation to reduce the acting force between the rolling ball 16 and the support rod 9. After the above two are loosened, under the action of the spring 11, the support rod 9 will be pushed outward and the rolling surface of the bearing 10 will abut against the engine shell. Since the limiting screw 13 is not separated from the limiting groove 12, the support rod 9 will not rotate. Then the limiting screw 13 is tightened to increase the acting force on the support rod 9, and the screw cap 17 is rotated inward, at this time the fastening sleeve 15 is pushed and extends into the sunken cavity, under the gradually reduced trend of the inner diameter of the sunken cavity, the acting force between the rolling ball 16 and the support rod 9 will be increased, thereby further preventing the axial displacement of the support rod 9 and improving the restriction effect on the radial displacement of the rocket engine.

[0029] The above is only the preferred embodiment of the present utility model patent, and it should be pointed out that for ordinary technical personnel in the technical field, some improvements and refinements can be made without departing from the principles of the present utility model patent, and these improvements and refinements should also be regarded as the protection scope of the present utility model patent.

Claims

1. A vertical thrust test stand for a rocket engine, characterized in that The application relates to a supporting device for an engine, which comprises a bottom plate, a push plate arranged at the center of the bottom plate and used for embedding the bottom end of the engine, a plurality of vertical columns arranged on the bottom plate in a vertical and uniform manner, and a plurality of supporting assemblies arranged on each column from top to bottom and used for limiting the radial deviation of the engine. Each supporting assembly comprises a connecting body, the rear end of the connecting body is sleeved on the column and fixed through fasteners, the front end of the connecting body is provided with a supporting rod arranged towards the axis of the engine, and the front end of the supporting rod is provided with a bearing used for abutting against the shell of the engine. A penetrating hole is formed in the connecting body and a spring is arranged in the penetrating hole, the rear end of the supporting rod is inserted into the penetrating hole and abuts against the spring, a limiting groove is formed in one side of the supporting rod, and a limiting screw is arranged on the connecting body and inserted into the limiting groove and used for limiting the displacement and deviation of the supporting rod.

2. The rocket engine vertical thrust test stand of claim 1, wherein, A locking assembly is further arranged at the front end of the connecting body and used for further limiting the displacement of the supporting rod. The locking assembly comprises a fastening seat arranged at the front end of the connecting body, a sunken cavity is formed in the fastening seat and the inner diameter of the sunken cavity gradually decreases from outside to inside, a fastening sleeve is sleeved on the supporting rod, a plurality of embedding grooves are arranged on the inner end of the fastening sleeve and communicate the inner side and the outer side of the fastening sleeve, a rolling ball with a diameter larger than the depth of the embedding groove is embedded in each embedding groove, A screw cover is sleeved on the outer end of the fastening sleeve and abuts against the stepped surface of the fastening sleeve, a corresponding ring groove is formed between the fastening sleeve and the screw cover, and a snap ring is arranged in the ring groove. The screw cover is threadedly connected with the fastening seat, in the process of screwing the screw cover into the fastening seat, the fastening sleeve is pushed and inserted into the sunken cavity, and under the action of the inner diameter of the sunken cavity, the acting force between the rolling ball and the supporting rod is increased.

3. The rocket engine vertical thrust test stand of claim 2, wherein, The inner end of the fastening seat is embedded into the connecting body and fixed through fastening screws.

4. The rocket engine vertical thrust test stand of claim 1, wherein, At least one sliding groove extending in the axial direction is formed in the column, the rear end of the connecting body is formed into a sleeve structure, the sleeve structure is sleeved on the column, a plurality of positioning keys are arranged on the sleeve structure in a rotating manner, and the ends of the positioning keys are embedded into the corresponding sliding grooves.

5. The rocket engine vertical thrust test stand of claim 1, wherein, A plurality of supporting seats are uniformly arranged on the bottom plate, and the bottom ends of the columns are embedded into the supporting seats and fixedly connected with the supporting seats.

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