A tilted liquid rocket engine diffuser fixing device

Abstract

The present invention relates to a device for moving and fixing a rocket engine diffuser, and more specifically, to a device for installing and positioning a rocket engine diffuser before testing. The device comprises at least a base platform provided with a step; a fixed frame, which is tilted and fixedly mounted above the base platform and is used to fix the rocket engine diffuser during a simulated test; a movable frame, which is tilted and positioned above the base platform and below the fixed frame, and can move at least left and right to achieve docking with the fixed frame; and a creeping drive system, which is mounted on the movable frame and is used to drive the rocket engine diffuser on the movable frame upward to a testing station. This diffuser fixing device can meet the requirements of tilted rocket engine testing.

Description

Technical Field

[0001] The invention relates to a moving and fixing device for a rocket engine diffuser, and in particular to an installation and positioning device for a rocket engine diffuser before a test run. Background Art

[0002] High-altitude simulation tests of liquid rocket engines on the ground require a high-altitude simulation test facility. This facility primarily consists of a vacuum chamber and a diffuser. The diffuser ejects the high-temperature, high-speed combustion gases generated by the engine, reducing the pressure within the chamber to the desired vacuum pressure. Prior to engine testing, the diffuser, 12 meters long, nearly 3 meters in diameter, and weighing 12 tons, must be moved in an inclined direction to a designated position. High coaxiality is required, and good sealing of the interfaces must be ensured during installation.

[0003] Currently, the horizontal docking of the diffuser and the vacuum chamber is mainly done manually or by screw drive, which is time-consuming and labor-intensive. The screw is prone to bending under long-term heavy loads and is also costly. Summary of the Invention

[0004] Based on the above description, the present invention provides a tilted rocket engine diffuser fixing device, which can easily achieve the docking of the diffuser and the vacuum chamber, and the entire device structure is firm and not prone to bending and damage.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The present invention provides an inclined liquid rocket engine diffuser fixing device, which at least includes a base platform, on which a step is provided; a fixing frame, which is fixedly and obliquely installed above the base platform and is used to fix the rocket engine diffuser during a test; a movable frame, which is obliquely arranged on the base platform and is located below the fixing frame, and can move at least left and right to achieve docking with the fixing frame; and a crawling drive system, which is installed on the movable frame and is used to drive the rocket engine diffuser on the movable frame to move upward to a test station.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the crawling drive system includes at least two pairs of axial wheel sets, which are symmetrically mounted on the mobile frame and can move axially along the crawling track on the mobile frame. The diffuser is fixed on the axial wheel sets.

[0009] Further, the crawling track is an I-shaped track steel structure, and the axial wheel group is a T-type track wheel, and the T-type track wheel is arranged on a support plate and cooperates with an anti-derail barb to move along the crawling track, and the anti-derail barb and the T-type track wheel are fixed on the support plate same side, and the diffuser is fixed on the support plate by a hoop and moves along with the axial wheel group.

[0010] Furthermore, the support plate is also provided with a jacking screw, and the diffuser bracket is fixed on the jacking screw and can be fine-tuned up and down by the jacking screw.

[0011] Furthermore, the T-shaped track wheel is fixed to the support plate through bolts and waist-round holes to achieve fine adjustment up and down.

[0012] Furthermore, the crawling drive system also includes a gear, a rack, and a slide rail. The slide rail is fixed in the middle of the inner surface of the movable frame and is located between each pair of axial wheel groups. The rack is located inside the slide rail. The gear is located below the slide rail and passes through the bottom surface of the slide rail to engage with the rack. The gear works under the drive of the power device, driving the rack to reciprocate along the slide rail. The upper surface of the rack is provided with a thrust block that can push the diffuser and the axial wheel group to move.

[0013] Furthermore, the power device at least includes a motor and a reducer matched through a worm gear structure.

[0014] Furthermore, the movable frame includes at least an upper movable frame and a lower movable frame, and the upper movable frame and the lower movable frame can be detachably installed together; during the simulation test, the rocket engine diffuser is located at the test station on the fixed frame and the upper movable frame, and the lower movable frame is evacuated.

[0015] Furthermore, the height of the movable frame is adjustable.

[0016] Specifically, the movable frame slides left and right along the steps of the base platform through track wheels and tracks, and a lifting mechanism is provided between the track wheels and the movable frame body.

[0017] Specifically, the lifting mechanism includes at least a rotary sleeve and a screw. The rotary sleeve is installed on the track wheel through a mounting seat. The screw rotates in the rotary sleeve. The movable frame body is installed on the top of the screw. By rotating the rotary sleeve, the movable frame body can be lifted and lowered through the screw.

[0018] Furthermore, a positioning mechanism is provided on the base platform. There are at least two groups of positioning mechanisms, which are respectively located at the loading station and the unloading station of the movable frame, so as to ensure the stability of the fixed frame when the diffuser is moved up and down.

[0019] Furthermore, the positioning mechanism at least includes a positioning rod hingedly mounted on the base, and a corresponding slot is provided on the movable frame. During positioning, the positioning rod is rotated to be stuck in the slot on the movable frame.

[0020] Furthermore, the fixed frame and / or the movable frame are also provided with an escalator.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0022] (1) The tilted liquid rocket engine diffuser fixing device provided by the present invention can conveniently achieve the docking of the liquid rocket engine diffuser and the vacuum chamber, and has a simple and reliable structure, is easy to operate, and is not prone to bending damage;

[0023] (2) The mobile frame is designed to be a detachable upper and lower structure, which can not only smoothly transfer the rocket engine diffuser from the lower position to the test station, but also prevent the mobile frame from being directly exposed to high temperature environment during the simulation test, thereby increasing the service life of the entire device;

[0024] (3) The creeping drive system adopts the drive mode of gear, rack and worm gear. On the one hand, the rack is not easy to deform, and on the other hand, it has the ability to prevent slope slip when starting on a slope, making the performance of the entire device more reliable;

[0025] (4) The fine-tuning structures at multiple locations allow the entire device to be easily fine-tuned as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of the inclined liquid rocket engine diffuser fixing device provided by an embodiment of the present invention after being fixed;

[0027] Figure 2 A schematic diagram of the structure of the inclined rocket engine diffuser fixing device provided by an embodiment of the present invention without the base;

[0028] Figure 3 A schematic structural diagram of the diffuser fixing device for a tilted rocket engine according to an embodiment of the present invention after the diffuser is fixed on a movable frame;

[0029] Figure 4 A schematic structural diagram of the upper movable frame of the inclined rocket engine diffuser fixing device provided by an embodiment of the present invention without an axial wheel set;

[0030] Figure 5 A schematic diagram of a portion of the structure of a creeping drive system for a tilted rocket engine diffuser fixture provided by an embodiment of the present invention;

[0031] Figure 6 A schematic structural diagram of a lifting mechanism for a tilted rocket engine diffuser fixing device according to an embodiment of the present invention;

[0032] Figure 7A schematic cross-sectional view of a clamp fixing a diffuser of a tilted rocket engine diffuser fixing device according to an embodiment of the present invention;

[0033] Figure 8 A schematic structural diagram of an axial wheel assembly in a creeping drive system of a tilted rocket engine diffuser fixing device provided by an embodiment of the present invention;

[0034] Figure 9 A schematic structural diagram of another angle of the axial wheel set in the creeping drive system of the inclined rocket engine diffuser fixing device provided by an embodiment of the present invention;

[0035] Figure 10 A schematic structural diagram of a locking device for a tilted rocket engine diffuser fixture provided by an embodiment of the present invention;

[0036] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0037] 1 base, 2 upper movable frame, 3 lower movable frame, 4 fixed frame, 5 clamp, 6 crawling drive system, 7 lifting mechanism, 8 locking device, 61 gear, 62 rack, 63 slide rail, 64 anti-derailment hook, 65 support plate, 66 lifting screw, 67 axial wheel set, 68 crawling track, 71 rotary sleeve, 72 screw. DETAILED DESCRIPTION

[0038] To facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. It will be understood that spatial relationship terms such as "under...", "below...", "below...", "under...", "above...", "above...", etc., can be used here to describe the relationship between an element or feature shown in the figures and other elements or features. It should be understood that in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the drawings is flipped, the element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under..." and "under..." can include both upper and lower orientations. In addition, the device can also include other orientations (for example, rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0039] It should be noted that when an element is considered to be “connected to” another element, it can be directly connected to the other element or connected to the other element through an intervening element.

[0040] like Figure 1 、 2As shown, a tilted liquid rocket engine diffuser fixing device comprises at least a base 1, on which a step is provided; a fixing frame 4, which is fixedly and tiltedly installed above the base 1 and is used to fix the rocket engine diffuser during test and trial operation; a movable frame, which is tiltedly arranged on the base 1 and is located below the fixing frame 4, and can move at least left and right to achieve docking with the fixing frame 4; and a crawling drive system 6, which is installed on the movable frame and is used to drive the rocket engine diffuser on the movable frame to move upward to the test station.

[0041] For example, Figure 3 、 4 As shown, the creeping drive system 6 includes at least two pairs of axial wheel sets 67, which are symmetrically mounted on the mobile frame and can move axially along the creeping track 68 on the mobile frame. The diffuser is fixed on the axial wheel set 67 and realizes axial movement through the axial wheel set.

[0042] Further, see Figure 5 The crawling drive system 6 also includes a gear 61, a rack and a slide rail 62. The slide rail 62 is fixed in the middle of the inner surface of the mobile frame and is located between each pair of axial wheel groups. The gear 61 is located below the slide rail 62 and passes through the bottom surface of the slide rail 62 to engage with the rack. The gear 61 works under the drive of the power device, driving the rack to reciprocate along the slide rail 62. A thrust block that can push the diffuser is provided on the upper surface of the rack. The thrust block can match the external structure of the diffuser to facilitate pushing the diffuser and the axial wheel group to move along the crawling track, thereby realizing the movement of the diffuser.

[0043] It is understood that the power unit can be implemented using a reducer-motor assembly, and a rack stopper 63 can be provided below the slide rail to prevent the rack from disengaging from the slide rail. In this embodiment, the power unit includes at least a motor and a reducer connected by a worm gear. The worm gear drive system provides slope-starting and anti-slip capabilities, meeting the requirements for tilting rocket engine testing.

[0044] Further, if Figure 10 The device also includes a locking device 8, which is used to fix the axial wheel assembly when loading and fixing the diffuser and when the diffuser moves upward to the test station. For example, pin hole positioning can be used, and stopper positioning can be used at the same time.

[0045] For example, the diffuser can be fixed between the axial wheel groups by a clamp 5. For details, see Figure 7 .

[0046] like Figure 8 、 9Shown, the structure of axial wheel group 67 and creeping track 68 can adopt following form, as mobile frame surface is provided with creeping track 68, creeping track 68 can adopt I-shaped track steel structure, axial wheel group 67 adopts T-type track wheel, T-type track wheel is arranged on support plate 65 and cooperates with anti-derail barb 64 to move along creeping track 68, anti-derail barb 64 is equally fixed on support plate 65 and preferably is arranged on same side with T-type track wheel, the opposite side of support plate 65 is provided with jacking screw 66, diffuser support can be fixed on support plate by jacking screw 66 and moves along with axial wheel group, and diffuser is fixed on diffuser support by hoop 5.By arranging jacking screw 66, pressure diffusion can be fine-tuned up and down.It is understandable that each axial wheel group can be provided with two anti-derail barbs 64, and two anti-derail barbs 64 are arranged side by side at axial wheel group both sides.

[0047] Furthermore, the mobile frame includes at least an upper mobile frame 2 and a lower mobile frame 3, which are detachably mounted together. During a simulated test run, the rocket engine diffuser is located at a test station on the fixed frame 4 and the upper mobile frame 2, and the lower mobile frame 3 can slide to another position for evacuation to prevent high temperature damage to the lower mobile frame during the simulated test run. Designing the mobile frame as a detachable upper and lower part structure can not only smoothly transfer the rocket engine diffuser from a lower location to the test station, but also prevent the mobile frame from being directly exposed to a high temperature environment during the simulated test run, thereby increasing the service life of the entire device.

[0048] It is understood that the upper and lower moving frames 2 and 3 can be detachably connected in various ways, such as by bolting. The axial wheel assembly and crawler track can be provided on both the upper and lower moving frames 2 and 3, and the gear 61, rack, and slide rail 62 can be installed only on the upper moving frame 2. The axial wheel assemblies on both the upper and lower moving frames 2 and 3 can be driven by the rack to move with the diffuser.

[0049] Furthermore, the height of the mobile frame is adjustable. Specifically, the mobile frame slides left and right along the steps of the base 1 through the track wheels and the track. A lifting mechanism 7 is provided between the track wheels and the mobile frame body. The lifting mechanism 7 includes at least a rotary sleeve 71 and a screw 72. The rotary sleeve 71 is installed on the track wheel through a mounting seat. The screw 72 rotates in the rotary sleeve 71. The mobile frame body is installed on the top of the screw 72. By rotating the rotary sleeve 71, the mobile frame body can be raised and lowered through the screw 72, thereby achieving fine-tuning of the height of the mobile frame.

[0050] Furthermore, the base 1 is equipped with a positioning mechanism. There are at least two sets of positioning mechanisms, one located at the loading and unloading stations of the mobile frame, to ensure stability when the fixed frame is lowering and lowering the diffuser. Exemplarily, the positioning mechanism includes at least one positioning rod hingedly mounted on the base 1, with a corresponding slot provided on the mobile frame. To position the position, the positioning rod is rotated to engage the slot on the mobile frame. For example, the slot can be provided on the mounting base of the track wheel.

[0051] In order to facilitate inspection and debugging by the installers, a ladder is provided on the fixed frame 4 and / or the movable frame. Furthermore, two ladders can be symmetrically provided, one on each side.

[0052] It is understood that the left and right sliding of the movable frame can be achieved by a motor or manually. The entire movable frame can be welded from steel pipes, and the upper movable frame 2 and the lower movable frame can both be driven by the same power mechanism. In practical applications, the drive can be achieved by a three-phase asynchronous motor and is generally installed on the lower movable frame 3. The lateral coaxiality adjustment requirement of ±3mm can be met.

[0053] During use, the upper and lower moving frames 2 and 3 are first bolted together at the loading station. The diffuser is then mounted between the axial wheel assemblies using a clamp 5, with a rubber pad placed on the inner ring of the clamp 5. The moving frame is then controlled to align with the fixed frame 4. The creep drive system is then activated to move the diffuser upward until it docks with the vacuum chamber, where it is further secured using the clamp 5. The left-right movement of the moving frame and fine-tuning of its height ensure precise assembly of the diffuser and the vacuum chamber.

[0054] The diffuser fixture is primarily welded from Q235-B steel pipes measuring 160×100×12mm, 80×60×5mm, and 60×40×4mm. Calculations show that during a test run, the maximum deformation under rated load is less than 2mm, and the maximum stress is within 100 MPa. This structural strength meets requirements, ensuring stability and reliability during the test run. The guide rails and slide rails utilize standard 38kg / m steel rails, offering a high load capacity and ensuring adequate support for the rollers during axial and lateral movement.

[0055] The axial wheel assembly is equipped with anti-derailment hooks (i.e., rail-holding structures) to ensure the safety of the equipment during axial movement and reduce the occurrence of accidents. A jacking screw 66 is provided on the support plate 65 to fine-tune the straightness of the axial wheel assembly. The lateral driven wheel assembly, in addition to providing sufficient support rigidity, also features height adjustment, using a left- and right-hand threaded adjustment sleeve with an adjustment range of ±40mm. The sleeve thread is M100×4. Two model 6310 roller bearings in each wheel assembly provide sufficient support force and adjustment accuracy. A locking function is also provided to limit the lateral movement of the equipment by pulling the positioning lever. The clamping hoop is a 5mm steel belt with a width of 100mm. The axial drive mainly adopts a rack and pinion transmission method, with a drive speed of 1.28m / min and good stability.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tilted liquid rocket engine diffuser fixing device, characterized in that: The invention comprises at least a base (1), wherein the base (1) is provided with a step; a fixed frame (4), wherein the fixed frame (4) is fixedly installed above the base (1) at an angle and is used to fix the rocket engine diffuser during a test; a movable frame, wherein the movable frame is arranged at an angle on the base (1) and is located below the fixed frame (4), wherein the movable frame can at least move left and right to achieve docking with the fixed frame (4); a crawling drive system (6), wherein the crawling drive system is installed on the movable frame and is used to drive the rocket engine diffuser on the movable frame to move upward to a test station; the crawling drive system (6) comprises at least two pairs of axial wheel sets (67), wherein the axial wheel sets (67) have at least two pairs and are symmetrically installed on the movable frame and can move axially along a crawling track (68) on the movable frame, wherein the diffuser is fixed on the axial wheel set (67); the crawling track is an I-shaped track steel structure, and the axial wheel set is a T-shaped track steel structure. Track wheel, the T-type track wheel is installed on a support plate (65) and cooperates with an anti-derail hook (64) to move along a crawling track (68), the anti-derail hook (64) and the T-type track wheel are fixed on the same side of the support plate (65), and the diffuser is fixed on the support plate (65) by a hoop (5) and moves along the axial wheel group; the mobile frame at least includes an upper mobile frame (2) and a lower mobile frame (3), and the upper mobile frame (2) and the lower mobile frame (3) are detachably installed together; during the simulation test, the rocket engine diffuser is located at a test station on a fixed frame and the upper mobile frame (2), and the lower mobile frame (3) is evacuated.

2. The inclined liquid rocket engine diffuser fixing device according to claim 1, characterized in that: The support plate (65) is further provided with a jacking screw (66), the diffuser bracket is fixed on the jacking screw (66) and can be fine-tuned up and down by the jacking screw (66), and the diffuser is fixed to the diffuser bracket by a hoop (5); the T-shaped track wheel is fixed to the support plate (65) by bolts and waist-round holes and can be fine-tuned up and down.

3. The inclined liquid rocket engine diffuser fixing device according to claim 1 or 2, characterized in that: The crawling drive system (6) further comprises a gear (61), a rack, and a slide rail (62); the slide rail (62) is fixed in the middle of the inner surface of the mobile frame and is located between each pair of axial wheel groups; the rack is located inside the slide rail (62); the gear (61) is located below the slide rail (62) and passes through the bottom surface of the slide rail (62) to engage with the rack; the gear (61) works under the drive of the power device, driving the rack to reciprocate along the slide rail (62); a thrust block capable of pushing the diffuser and the axial wheel group to move is provided on the upper surface of the rack; and / or the power device at least comprises a motor and a reducer matched through a worm gear structure.

4. The inclined liquid rocket engine diffuser fixing device according to claim 1, characterized in that: The height of the movable frame is adjustable; and / or the movable frame slides left and right along the steps of the base (1) via track wheels and tracks, and a lifting mechanism (7) is provided between the track wheels and the movable frame body.

5. The inclined liquid rocket engine diffuser fixing device according to claim 4, characterized in that: The lifting mechanism comprises at least a rotary sleeve (71) and a screw rod (72). The rotary sleeve (71) is mounted on the track wheel via a mounting seat. The screw rod (72) is rotatably sleeved in the rotary sleeve (71). The movable frame body is mounted on the top of the screw rod (72). By rotating the rotary sleeve (71), the movable frame body can be lifted and lowered via the screw rod (72).

6. The inclined liquid rocket engine diffuser fixing device according to claim 1, characterized in that: The base (1) is also provided with a positioning mechanism, and the positioning mechanism is provided with at least two groups, which are respectively located at the loading station and the unloading station of the movable frame, and are used to ensure the stability of the fixed frame when the diffuser is moved up and down.

7. The inclined liquid rocket engine diffuser fixing device according to claim 6, characterized in that: The positioning mechanism at least comprises a positioning rod hingedly mounted on the base (1); a corresponding card slot is provided on the movable frame; when positioning, the positioning rod is rotated to be locked in the card slot on the movable frame.

8. The inclined liquid rocket engine diffuser fixing device according to claim 1, characterized in that: The fixed frame and / or the movable frame are also provided with an escalator.

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