Low-impact multi-stage connection thrust device

Abstract

The application provides a low-impact multi-stage action connecting thrust device with strong connection, weak thrust and low impact environment, which comprises a stepped shell, a middle thrust rod, a connecting disc, an unlocking thrust disc, an energy-absorbing buffer ring, a middle connecting bolt, an adapter screw sleeve, an energy-absorbing buffer disc, a head-end connecting screw and an actuating gas source pipe; the actuating gas source pipe is connected with one end of the stepped shell, the other end of the stepped shell is installed in one end port of the connecting disc, and the unlocking thrust disc is pressed in the inner cavity of the connecting disc through the front end face; the middle thrust rod is installed in the stepped shell and the unlocking thrust disc to form a sliding pair, and the large end of the middle thrust rod is provided with a vent hole; one end of the middle connecting bolt is installed in a blind hole in the center of the small end of the connecting disc, the energy-absorbing buffer ring is sleeved on the column section of the middle connecting bolt, the other end of the middle connecting bolt is inserted into the adapter screw sleeve, and the energy-absorbing buffers are tightly attached to the connecting disc and the adapter screw sleeve respectively; the adapter screw sleeve is connected with the head-end connecting screw, and the energy-absorbing buffer disc is clamped between the head-end connecting screw and the middle connecting bolt.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of spacecraft structure and relates to a low-impact multi-stage acting connecting thrust device. BACKGROUND

[0002] There are various environments of stage separation and wing rudder separation in a spacecraft that need connecting and thrusting functions. Since the separation structure is weak or the nearby installed elements are sensitive, there is a demand for low thrust and large impulse. In the past, strong connecting explosive bolts and weak thrusting long thrust rods are used to realize the functions, but there are problems of complex time sequence control of unlocking and thrusting actions, complex system composition, large installation space, large weight and low reliability. SUMMARY

[0003] The application solves the technical problem of the above problems. The application provides a low-impact multi-stage acting connecting thrust device with strong connection, weak thrust, low impact environment, compact structure, good connection performance, stable thrust, long thrust stroke, small unlocking impact, good sealing performance, light structure weight and convenient installation.

[0004] The application adopts the technical scheme of a low-impact multi-stage acting connecting thrust device, which comprises a stepped shell, a middle thrust rod, a connecting disc, an unlocking thrust disc, an energy-absorbing buffer ring, a middle connecting bolt, an adapter screw sleeve, an energy-absorbing buffer disc, a head-end connecting screw and an actuating gas source pipe.

[0005] The actuating gas source pipe is connected with one end of the stepped shell, the other end of the stepped shell is installed in one end port of the connecting disc, and the unlocking thrust disc is pressed in the inner cavity of the connecting disc through the front end face; the middle thrust rod is installed in the stepped shell and the unlocking thrust disc to form a sliding pair, and the large end of the middle thrust rod is provided with a gas hole; one end of the middle connecting bolt is installed in the blind hole at the center of the small end of the connecting disc, the energy-absorbing buffer ring is sleeved on the column section of the middle connecting bolt, the other end of the middle connecting bolt is inserted into the adapter screw sleeve, and the energy-absorbing buffers are tightly attached to the connecting disc and the adapter screw sleeve respectively; the adapter screw sleeve is connected with the head-end connecting screw, and the energy-absorbing buffer disc is clamped between the head-end connecting screw and the middle connecting bolt.

[0006] Further, the stepped shell is a shaft sleeve structure provided with a stepped structure, and one end is connected with the inner thread of the connecting disc through the outer thread.

[0007] Further, the connecting disc is a rotary body structure, the front end is provided with a threaded hole along the central axis, the threaded hole is a blind hole, the inner peripheral surface of the rear end cavity is provided with an inner thread at the port, the inner end surface of the rear end cavity is provided with an annular groove at the center position, forming a preset fracture zone, the center of the annular groove is provided with a spherical surface, and the annular surface between the spherical surface and the annular groove is a front inner end surface.

[0008] Further, the middle push rod is a stepped shaft structure, the outer circumferential surface of the large end of the middle push rod and the inner circumferential surface of the stepped shell form a sliding pair, the outer circumferential surface of the middle push rod and the inner circumferential surface of the unlocking push disc form a sliding pair, the rear end surface of the large end of the middle push rod is close to the end surface of the inner convex ring of the stepped shell, and the ball head at the front end of the middle push rod is pressed into the spherical recess surface of the connecting disc.

[0009] Further, the vent hole is arranged on the taper surface between the large end of the middle push rod and the rod segment.

[0010] Further, the low-impact multi-stage action connecting thrust device further comprises outer and inner O-rings, the unlocking push disc is a flat disc-shaped stepped disc structure, the outer circumferential surface of the unlocking push disc and the inner circumferential surface of the connecting disc form a sliding pair, the front end surface of the small end of the unlocking push disc is pressed onto the front inner end surface of the connecting disc, O-ring grooves are arranged on the outer circumferential surface of the unlocking push disc and the inner circumferential surface of the unlocking push disc, and the O-ring grooves are used for mounting the outer and inner O-rings.

[0011] Further, the energy-absorbing buffer ring is an annular inner recessed hexagonal lattice energy-absorbing structure.

[0012] Further, the energy-absorbing buffer disc is a cylindrical inner recessed hexagonal lattice energy-absorbing structure.

[0013] Further, the actuating gas source pipe is an element or device for generating high-pressure actuating gas.

[0014] Further, the actuating gas source pipe generates high-pressure gas, the high-pressure gas passes through the middle push rod through the vent hole and acts on the rear end surface of the unlocking push disc, the high-pressure gas pushes the unlocking push disc to move forward, at this time, the connecting disc is cut off, the unlocking action is completed, the impact action is buffered by the inner shrinkage deformation energy absorption of the energy-absorbing buffer ring and the energy-absorbing buffer disc, the high-pressure gas pushes the middle push rod to move forward, and the front part of the broken connecting disc, the energy-absorbing buffer ring after collapse, the middle connecting bolt, the adapter sleeve, the energy-absorbing buffer disc after collapse and the head end connecting screw are pushed out together, forming a push impact action.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] (1) The present application has a compact structure, is a device integrating the functions of connection, unlocking, push impact and buffering, has high energy utilization rate and small size through single energy action;

[0017] (2) The present application has good connection, the connection unlocking structure is a pre-set breaking structure integrated in the end surface of the connecting disc, the connection capacity can be designed and is reliable, and the unlocking is fast and reliable.

[0018] (3) The present application has stable thrust, the thrust after unlocking uses stable inner cavity pressure, and the dramatic change of the thrust formed by the dramatic change section of the propellant gas is avoided.

[0019] (4) The present application has a long push stroke, and the push rod and the unlocking rod are separated, which not only ensures reliable unlocking, but also can set a longer push rod to form a longer push force acting distance, and meet the impulse requirement.

[0020] (5) The present application has small unlocking impact, and uses the energy-absorbing concave hexagonal lattice structure ring and disc to absorb energy and isolate unlocking impact, thereby protecting the connected components.

[0021] (6) The device of the present application forms a sealed cavity after unlocking, has good sealing performance, no external pollution, light structure weight, and convenient installation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure principle diagram of the low-impact multi-stage action connecting push force device.

[0023] Figure 2 It is a structure principle diagram of the stepped shell.

[0024] Figure 3 It is a structure principle diagram of the middle push rod.

[0025] Figure 4 It is a structure principle diagram of the connecting disc.

[0026] Figure 5 It is a structure principle diagram of the unlocking push disc.

[0027] Figure 6 It is a structure principle diagram of the energy-absorbing buffer ring.

[0028] Figure 7 It is a structure principle diagram of the energy-absorbing buffer disc. DETAILED DESCRIPTION

[0029] The present application will be described in conjunction with the drawings.

[0030] For the interstage separation, wing and rudder separation environment requiring connection and push impact function, and the requirement of compact structure and high system reliability, the present application discloses a low-impact multi-stage action connecting push force device suitable for strong connection, weak push impact and low impact environment. The structure has the advantages of compact structure, good connection performance, stable push force, long push stroke, small unlocking impact, good sealing performance, light structure weight and convenient installation, and can provide good connection function, push impact function and small impact environment for spacecraft instruments and equipment.

[0031] As shown in Figure 1 The low-impact multi-stage action connecting push force device includes a stepped shell 1, a middle push rod 2, a connecting disc 3, an unlocking push disc 4, an energy-absorbing buffer ring 5, a middle connecting bolt 6, an adapter sleeve 7, an energy-absorbing buffer disc 8, a head-end connecting screw 9, an outer O-ring 10, an inner O-ring 11, and an actuating gas source pipe 12.

[0032] As shown inFigure 2 As shown, the stepped shell 1 is a stepped bushing structure, and its external thread 1.1 is connected to the internal thread 3.2 of the connecting plate 3. The unlocking push plate 4 is pressed onto the inner end face 3.10 of the connecting plate 3 through the front end face 1.2.

[0033] like Figure 3 As shown, the push rod 2 is a slender stepped shaft structure, with its large end outer circumferential surface 2.1 forming a sliding pair with the inner circumferential surface 1.4 of the stepped shell 1. The outer circumferential surface 2.2 of the push rod 2 also forms a sliding pair with the inner circumferential surface 4.7 of the unlocking push plate 4. When installed, the large end rear end face of the push rod 2 is tightly fitted against the inner convex ring end face 1.7 of the stepped shell 1, and the ball head 2.3 at the front end of the push rod 2 is pressed into the ball-and-socket surface 3.7 of the connecting plate 3. A vent hole 2.4 is provided on the conical surface between the large end of the push rod 2 and the rod section.

[0034] like Figure 5 As shown, the unlocking push plate 4 is a flat stepped disc structure, with its outer circumferential surface 4.1 forming a sliding pair with the smooth inner circumferential surface 3.5 of the connecting plate 3. The front end face 4.5 of the small end is pressed against the front inner end face 3.10 of the connecting plate 3. An O-ring groove 4.2 is provided on the outer circumferential surface of the unlocking push plate 4 for installing the outer O-ring 10. An O-ring groove 4.6 is provided on the inner circumferential surface of the unlocking push plate 4 for installing the inner O-ring 11.

[0035] like Figure 4 As shown, the connecting disc 3 is a rotating structure. A threaded hole 3.3 is provided along the central axis at the front end (small end). The threaded hole 3.3 is a blind hole. An internal thread 3.2 is provided at the port on the inner circumferential surface 3.5 of the rear end (large end) cavity. An annular groove is provided at the center of the inner end face 3.9 of the rear end cavity, forming a pre-set fracture zone 3.6. A ball-and-socket surface 3.7 is provided at the center of the annular groove. The annular surface between the ball-and-socket surface and the annular groove is the front inner end face 3.10. The middle connecting bolt 6 is screwed into the threaded hole 3.3 to form a reliable connection. The cylindrical section of the middle connecting bolt 6 is fitted with the energy-absorbing buffer ring 5. The end faces of the energy-absorbing buffer 5 are respectively close to the front end face 3.8 of the connecting disc 3 and the rear end face of the adapter sleeve 7.

[0036] The intermediate connecting bolt 6 is inserted into the adapter sleeve 7 to form a connection structure. The thread at the front end of the adapter sleeve 7 connects with the thread at the rear end of the head connecting screw 9. The energy-absorbing buffer disc 8 is clamped between the rear end face of the head connecting screw 9 and the front end face of the intermediate connecting bolt 6.

[0037] like Figure 6 , Figure 7 As shown, both the energy-absorbing buffer ring 5 and the energy-absorbing buffer disk 8 are concave hexagonal lattice energy-absorbing structures. Specifically, the energy-absorbing buffer ring 5 is a ring-shaped structure, and the energy-absorbing buffer disk 8 is a short cylindrical structure.

[0038] The actuating gas source pipe 12 is connected with the stepped shell 1, and the actuating gas source pipe 12 is an element or device for generating high-pressure actuating gas, and is usually an igniter, and can also be a high-pressure gas source pipeline.

[0039] The working principle is as follows:

[0040] The actuating gas source pipe 12 rapidly generates high-pressure gas, and the high-pressure gas passes through the vent hole 2.4 and acts on the rear end surface 4.3 of the unlocking push disc 4 through the middle push rod 2. The high-pressure gas pushes the unlocking push disc 4 to move forward until the front end surface 4.4 is in contact with the inner end surface 3.9 of the connecting disc 3. At this time, the ring segment with a thickness of t in the preset breaking zone 3.6 of the connecting disc 3 is cut off, and the unlocking action is completed. The large impact force generated is buffered through the energy-absorbing buffer ring 5 and the energy-absorbing buffer disc 8 which are deformed inward to absorb energy. Then the high-pressure gas pushes the middle push rod 2 to move forward, and the front part of the broken connecting disc 3 and the energy-absorbing buffer ring 5, the middle connecting bolt 6, the adapter screw sleeve 7, the energy-absorbing buffer disc 8 and the head end connecting screw 9 are pushed out together, forming a push impact action.

[0041] The connecting unlocking push impact device of the application is used for a certain folding rudder.

[0042] The stepped shell 1, the middle push rod 2, the connecting disc 3, the unlocking push disc 4, the middle connecting bolt 6, the adapter screw sleeve 7 and the head end connecting screw 9 are made of Ph13-8Mo precipitation hardened stainless steel, and the two surfaces of each sliding pair are coated with a MoS2 friction-reducing coating.

[0043] The energy-absorbing buffer ring 5 and the energy-absorbing buffer disc 8 are double Σ-shaped lattice energy-absorbing structures, which are cut into shapes after being manufactured by 3D printing additive manufacturing using AlSi10Mg powder particles. The characteristic parameters of the energy-absorbing buffer ring 5 and the energy-absorbing buffer disc 8 are as follows: the included angle α is 60°, the cell height h is 1.5 mm, and the wall thickness t is 0.2 mm. The number of lattice characteristic layers is 2.

[0044] The external connecting thread of the head end connecting screw 9 is an M8 standard thread.

[0045] The parts not described in detail in the application belong to the known technology of those skilled in the art.

Claims

1. A low-impact multi-stage connecting thrust device, characterized in that, It comprises a stepped shell (1), a middle push rod (2), a connecting disc (3), an unlocking push disc (4), an energy-absorbing buffer ring (5), a middle segment connecting bolt (6), an adapter sleeve (7), an energy-absorbing buffer disc (8), a head-end connecting screw (9) and an actuating gas source pipe (12). The actuating gas source pipe (12) is connected with one end of the stepped shell (1), the other end of the stepped shell (1) is installed in one end port of the connecting disc (3), and the unlocking push disc (4) is pressed in the inner cavity of the connecting disc (3) through the front end face (1.2); the middle push rod (2) is installed in the stepped shell (1) and the unlocking push disc (4) to form a sliding pair, and the large end of the middle push rod (2) is provided with a vent hole (2.4); one end of the middle segment connecting bolt (6) is installed in the blind hole in the center of the small end of the connecting disc (3), the energy-absorbing buffer ring (5) is sleeved on the column segment of the middle segment connecting bolt (6), the other end of the middle segment connecting bolt (6) is inserted into the adapter sleeve (7), and the energy-absorbing buffer ring (5) is tightly attached to the connecting disc (3) and the adapter sleeve (7) respectively; the adapter sleeve (7) is connected with the head-end connecting screw (9), and the energy-absorbing buffer disc (8) is clamped between the head-end connecting screw (9) and the middle segment connecting bolt (6). The actuating gas source pipe (12) generates high-pressure gas, which passes through the vent hole (2.4) and the middle push rod (2) to act on the rear end face (4.3) of the unlocking push disc (4), the high-pressure gas pushes the unlocking push disc (4) to move forward, at this time, the connecting disc (3) is cut off, the unlocking is completed, the impact effect is buffered by the energy-absorbing buffer ring (5) and the energy-absorbing buffer disc (8) through the energy-absorbing deformation, the high-pressure gas pushes the middle push rod (2) to move forward, and the front part of the broken connecting disc (3) and the collapsed energy-absorbing buffer ring (5), the middle segment connecting bolt (6), the adapter sleeve (7), the collapsed energy-absorbing buffer disc (8) and the head-end connecting screw (9) are pushed out together to form a push impact effect.

2. A low-impact multi-stage connecting thrust device according to claim 1, characterized in that The stepped shell (1) is a shaft sleeve structure provided with a stepped structure, and one end is connected with the connecting disc (3) through the cooperation of the external thread (1.1) and the internal thread (3.2) of the connecting disc (3).

3. A low-impact multi-stage connecting thrust device according to claim 1, characterized in that, The connecting disc (3) is a rotary body structure, the front end is provided with a threaded hole (3.3) along the central axis, the threaded hole (3.3) is a blind hole, the inner circumferential surface (3.5) of the rear end cavity is provided with an internal thread (3.2) at the port, the inner end surface (3.9) of the rear end cavity is provided with an annular groove at the center position, forming a preset breaking zone (3.6), the center of the annular groove is provided with a spherical surface (3.7), and the annular surface between the spherical surface and the annular groove is a front inner end surface (3.10).

4. A low-impact multi-stage connecting thrust device according to claim 3, characterized in that The middle push rod (2) is a stepped shaft structure, the large end outer circumferential surface (2.1) forms a sliding pair with the inner circumferential surface (1.4) of the stepped shell (1); the rod outer circumferential surface (2.2) of the middle push rod (2) forms a sliding pair with the inner circumferential surface (4.7) of the unlocking push disc (4), the large end rear end face of the middle push rod (2) is tightly attached to the inner convex ring end face (1.7) of the stepped shell (1), and the ball head (2.3) of the front end of the middle push rod (2) is tightly pressed into the spherical surface (3.7) of the connecting disc (3).

5. A low-impact multi-stage connecting thrust device according to claim 4, characterized in that The vent hole (2.4) is arranged on the taper surface between the large end and the rod segment of the middle push rod (2).

6. A low-impact multi-stage connecting thrust device according to claim 4, characterized in that Also include the outer O-ring (10), inner O-ring (11), unlock push disc (4) is a flat disc-shaped stepped disc structure, the outer peripheral surface (4.1) and the inner peripheral surface (3.5) of the connecting disc (3) form a sliding pair, the front end surface 4.5 of the small end is pressed onto the front inner end surface (3.10) of the connecting disc (3); The outer peripheral surface (4.1) of the unlocking push disc (4) is provided with an O-ring groove (4.2) for installing the outer O-ring (10); The inner peripheral surface of the unlocking push disc (4) is provided with an O-ring groove (4.6) for installing the inner O-ring (11).

7. A low-impact multi-stage connecting thrust device according to claim 1, characterized in that, The energy absorption buffer ring (5) is a ring-shaped concave hexagonal lattice energy absorption structure.

8. A low-impact multi-stage connecting thrust device according to claim 1, characterized in that The energy absorption buffer disc (8) is a cylindrical concave hexagonal lattice energy absorption structure.

9. A low-impact multi-stage connecting thrust device according to claim 1, characterized in that The actuating gas source pipe (12) is an element or device for generating high-pressure actuating gas.

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