A position-limiting and buffering vibration isolation device

Abstract

The application provides a limiting and buffering vibration isolation device, belonging to the technical field of vibration reduction. The device comprises an upper cover, a stepped hole structure is formed in the upper cover, one side of the stepped hole structure is an opening, and the other side is provided with a through hole connected with the stepped hole; a lower cover is fixedly connected with the upper cover to form a cavity; a buffering bushing is arranged in the cavity, and is matched with the upper cover and the lower cover; a core shaft is installed in one end of the through hole, and the other end of the core shaft passes through the cavity to form an annular cavity between the upper cover, the lower cover and the core shaft; a base is arranged in the annular cavity, and a radially extending protrusion is arranged in the base to form an upper cavity and a lower cavity distributed in an upper and lower manner between the base and the core shaft; a damping pad is arranged in the upper cavity and the lower cavity; and a limiting ring is installed at one end of the base in the annular cavity, and is limited in the annular cavity by the buffering bushing.

Description

Technical Field

[0001] The present application belongs to the field of vibration isolation technology, and in particular relates to a position limiting buffer vibration isolation device. Background Art

[0002] With the rapid development of weaponry and aerospace equipment, the pyrotechnic shock environment encountered during launches demands that these devices possess superior vibration isolation and shock resistance. The impact loads during weaponry launches can adversely affect mechanical equipment, while the shock of spacecraft-rocket separation can affect sensitive components in aerospace equipment and even the normal operation of the spacecraft, potentially leading to mission failure. Therefore, buffering devices tailored to the vibration isolation and shock absorption requirements of weaponry and aerospace equipment are needed.

[0003] Existing vibration damping devices typically consist of isolators made of a single structural stiffness, such as wire mesh, metal rubber, or rubber. These devices only offer good vibration isolation and cushioning effects for a single operating condition and are unable to achieve vibration isolation and impact cushioning in conditions involving a combination of vibration environments and high-magnitude impact loads. For example, vehicle-mounted or airborne weaponry must withstand ground loads during vehicle operation or vibration loads during flight. Mechanical equipment also requires strong impact resistance and limiting capabilities against impact loads during weapon launch. Aerospace equipment must withstand the impact loads of launch and separation, as well as the vibration loads of flight.

[0004] Therefore, a vibration isolation device that can withstand both vibration and impact combined working conditions is needed. Summary of the Invention

[0005] The purpose of this application is to provide a position limiting, buffering and vibration isolating device to solve or alleviate at least one problem in the background technology.

[0006] The technical solution of this application is: a limit buffer vibration isolation device, comprising:

[0007] An upper cover having a stepped hole structure formed therein, wherein one side of the stepped hole structure is open and the other side is provided with a through hole connected to the stepped hole;

[0008] a lower cover, the lower cover being fixedly connected to the upper cover to form a cavity;

[0009] a buffer bushing, the buffer bushing being disposed in the cavity and being adapted to fit the upper cover and the lower cover;

[0010] a core shaft, one end of which is installed in the through hole and the other end of which partially passes through the cavity, thereby forming an annular cavity between the upper cover, the lower cover and the core shaft;

[0011] A base, the base being disposed in the annular cavity and having a radially extending protrusion disposed therein, thereby forming an upper cavity and a lower cavity distributed vertically between the base and the core shaft;

[0012] Vibration-damping pads, the vibration-damping pads being arranged in the upper cavity and the lower cavity;

[0013] A limiting ring is installed at one end of the base located in the annular cavity and is limited in the annular cavity by the buffer bushing.

[0014] In an optional embodiment of the present application, the stepped hole structure of the upper cover is configured to be a flat surface with a larger diameter and a first curved surface with a smaller diameter, and the end face of the upper cover is provided with a first mounting hole for controlling the rotation of the upper cover.

[0015] In an optional embodiment of the present application, the lower cover is a tubular step structure, and the lower cover is connected to the upper cover by a threaded structure.

[0016] In an optional embodiment of the present application, a radially extending base flange is provided on one side of the base, and a base fixing hole for connecting to a fixed foundation is provided on the base flange;

[0017] A second mounting hole for controlling the rotation of the base is provided on the side wall of the base body close to the base flange

[0018] In an optional embodiment of the present application, the protrusion is inclined toward a side away from the base flange, and the protrusion is an arc-shaped structure, with an upper arc surface and a lower arc surface formed on both sides of the protrusion.

[0019] In an optional embodiment of the present application, one side of the core shaft has a radially extending core shaft flange, and one side surface of the core shaft flange is an arc surface, which forms a limiting structure for the vibration damping pad set in the lower cavity.

[0020] In an optional embodiment of the present application, the upper and lower surfaces of the vibration damping pad are both arc-shaped and adapt to the arc surfaces on the upper cover, the protrusion and the core shaft flange.

[0021] In an optional embodiment of the present application, the vibration damping pad is formed by pressing a metal mesh.

[0022] In an optional embodiment of the present application, a buffer pad is further included, and the buffer pad is arranged on the limiting ring.

[0023] In an optional embodiment of the present application, there is an axial displacement space between the upper surface of the buffer pad and the flat surface of the upper cover, and there is an axial displacement space between the lower part of the limit ring and the step surface of the buffer bushing; there is a radial displacement space between the buffer bushing, the limit ring and the base.

[0024] This application can effectively solve the use requirements of weapons and aerospace equipment in a complex working environment of vibration and high-value impact and the use requirements of vibration reduction and buffering functions; adopts a combined stiffness design, the low stiffness module realizes the low-frequency vibration isolation and buffering function in the vibration environment, and the high stiffness module realizes the function of limiting and buffering the impact of large values; adopts a design structure of an arc-shaped force-bearing surface to increase the force-bearing surface, provide radial load distribution, and increase radial stiffness, so that the vibration isolation device has better vibration isolation and buffering function during use; the shape of the arc-shaped vibration damping pad decomposes the force on the arc-shaped contact surface into radial force, provides shear damping, and realizes a composite high damping design with friction damping to store and absorb energy peaks of vibration and impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0026] Figure 1 This is an overall schematic diagram of the limiting buffer vibration isolation device of this application.

[0027] Figure 2 This is a cross-sectional view of the limiting buffer vibration isolation device of this application.

[0028] Figure 3 This is a schematic diagram of the upper cover in this application.

[0029] Figure 4 This is a schematic diagram of the lower cover in this application.

[0030] Figure 5 This is a schematic diagram of the appearance of the base in this application.

[0031] Figure 6 This is a cross-sectional view of the base in this application.

[0032] Figure 7 This is a schematic diagram of the appearance of the core shaft in this application.

[0033] Figure 8 This is a cross-sectional view of the mandrel in this application.

[0034] Figure 9 This is a schematic diagram of the appearance of the vibration damping pad in this application.

[0035] Figure 10 This is a cross-sectional view of the vibration damping pad in this application.

[0036] Figure 11 This is a schematic diagram of the buffer bushing in this application.

[0037] Figure 12 Schematic diagram of the limiting ring in this application.

[0038] Reference numerals:

[0039] 10-Limited buffer vibration isolation device

[0040] 1-Upper cover

[0041] 11-Opening

[0042] 12-Piercing

[0043] 13-First arc surface

[0044] 14-Flat surface

[0045] 15-First external thread

[0046] 16-First mounting hole

[0047] 2-Lower cover

[0048] 21-first internal thread

[0049] 3-Base

[0050] 31-base flange, 311-base fixing hole

[0051] 32-Second mounting hole

[0052] 33-Second external thread

[0053] 34- convex, 341- upper arc surface, 342- lower arc surface

[0054] 4-core shaft

[0055] 41-core shaft flange, 411-installation notch, 412-second arc surface

[0056] 42-Second internal thread

[0057] 5-Vibration damping pad

[0058] 6-Buffer bushing

[0059] 7-limiting ring, 71-third internal thread, 72-third mounting hole

[0060] 8-Buffer pad DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0062] The present application provides a position-limiting, buffering, and vibration-isolating device with a simple structure and easy implementation. The device can have both vibration isolation and buffering capabilities under combined vibration and impact working conditions, can achieve a good absorption effect on impact response, and can buffer and limit spatial installation structures to avoid interference between devices caused by large displacements caused by large loads.

[0063] Figure 1 and Figure 2 As shown, the limiting buffering and vibration isolation device 10 provided in the present application includes an upper cover 1, a lower cover 2, a base 3, a core shaft 4, a vibration damping pad 5, a buffer bushing 6, a limiting ring 7 and a buffer pad 8.

[0064] like Figure 3 As shown, the upper cover 1 is generally cylindrical, with an opening 11 on one side of its body. The outer surface of the opening 11 is provided with a first external thread 15. A stepped hole structure is formed in the opening 11, which includes a flat surface 14 with a larger diameter and a first curved surface 13 with a smaller diameter. A through-hole 12 is provided on the other side of the body to communicate with the stepped hole structure. A first mounting hole 16 for rotating the upper cover 1 is provided on the outer end surface of the through-hole. Generally, two or more first mounting holes 16 can be provided, and the rotation of the upper cover 1 can be controlled by a pin inserted into the first mounting hole 16.

[0065] like Figure 4 As shown, the lower cover 2 is generally a stepped tubular structure with a stepped hole formed on its inner side. The side of the larger diameter stepped hole is provided with a first internal thread 21 adapted to fit the first external thread 15 in the upper cover 1. The smaller diameter stepped hole serves as a stop for the opening 11 of the upper cover 1. The first external thread 15 of the upper cover 1 can be assembled to the first internal thread 21 of the lower cover 2 using the first mounting hole 16 of the upper cover 1 and tightened, thereby forming a cavity between the upper and lower covers 1 and 2.

[0066] like Figure 5 and Figure 6 As shown, the main body of the base 3 is a tubular structure with a base flange 31 extending radially from its underside. The base flange 31 is provided with a base fixing hole 311 for connection to a fixed foundation. A second mounting hole 32 is provided on the sidewall of the base 3 body near the base flange 31. A cylindrical pin inserted into the second mounting hole 32 allows the base 3 to be rotated and installed. A second external thread 33 is provided on the outer surface of the base 3 body away from the base flange 31. Furthermore, a radially extending protrusion 34 is provided on the inner side of the base 3 body. The protrusion 34 is inclined toward the side away from the base flange 31 and has an arc-shaped structure, with an upper arc surface 341 and a lower arc surface 342 formed on either side.

[0067] like Figure 7 and Figure 8As shown, a core shaft flange 41 is provided on one side of the body of the core shaft 4, and a mounting notch 411 is provided on the edge of the core shaft flange 41, and the upper surface of the core shaft flange 41 is a second arc surface 412. In some embodiments of the present application, the mounting notch 411 can be a rectangular notch or a semicircular notch. The core shaft 4 body is a hollow shaft structure, and a second internal thread 42 is provided on the inner side thereof, which can be connected to the vibration-damped equipment by connecting bolts. One side of the non-core shaft flange 41 of the core shaft 4 body is inserted into the through hole 12 of the upper cover 1, and the two can be fixedly connected by welding, thereby forming an annular cavity between the upper cover 1, the lower cover 2 and the core shaft 4. The base 3 is placed in the annular cavity, thereby dividing the annular cavity between the base 3 and the core shaft 4 into an upper cavity A and a lower cavity B distributed up and down.

[0068] like Figure 9 and Figure 10 As shown, the vibration damping pad 5 includes an upper vibration damping pad and a lower vibration damping pad, both of which have curved upper and lower surfaces. The upper vibration damping pad is disposed in cavity A, with its upper surface tightly fitting the first curved surface 13 of the upper cover 1 and its lower surface tightly fitting the upper curved surface 341 of the base 3. The lower vibration damping pad is disposed in cavity B, with its upper surface tightly fitting the lower curved surface 342 of the base 3 and its lower surface tightly fitting the second curved surface 412 of the core shaft 4.

[0069] In a preferred embodiment of the present application, the vibration damping pad 5 is formed by pressing a metal mesh. The vibration damping pad 5 constitutes a low-rigidity vibration isolation module. During movement, the contact force between the arc surface of the vibration damping pad 5 and the upper and lower arc surfaces of the base 3 is decomposed into axial force and radial force. The axial force squeezes the friction damping provided by the vibration damping pad 5, and the radial force squeezes the vibration damping pad 3 to increase lateral stiffness while providing shear damping. The friction damping and shear damping work together to improve energy dissipation and vibration reduction, while also supporting the internal position of the vibration isolation module. It is understandable that the vibration damping pad 5 can also be an elastic element of other materials with the same effect.

[0070] like Figure 11 As shown, the buffer bushing 6 is a step-shaped structure, which is arranged in the annular cavity between the upper cover 1 and the base 3. The buffer bushing 6 fits tightly with the inner wall surface of the upper cover 1 and the end faces of the step structure of the lower cover 2, and is limited by the lower cover 2.

[0071] like Figure 12 As shown, the inner wall surface of the limiting ring 7 is provided with a third internal thread 71, and the limiting ring 7 is mounted on the second external thread 33 of the base 3 via the third internal thread 71. The end surface of the limiting ring 7 away from the base flange 31 is provided with a third mounting hole 72, and a cylindrical pin is inserted to control the rotation of the limiting ring 7 relative to the base 3.

[0072] In some embodiments of the present application, a buffer pad 8 is provided on the end surface of the third mounting hole of the limiting ring 7, and the buffer pad 8 can be relatively fixed to the limiting ring 7 by bonding.

[0073] In the present application, there is an axial displacement space between the upper surface of the buffer pad 8 and the flat surface 14 of the upper cover 1, and there is an axial displacement space between the lower part of the limit ring 7 and the stepped surface of the buffer bushing 6; there is a radial displacement space between the larger diameter inner wall surface of the buffer bushing 6 and the outer ring surface of the limit ring 7, and there is a radial displacement space between the smaller diameter inner wall surface of the buffer bushing 6 and the outer cylindrical surface of the base 3 body. When the vibration isolation module is working, the buffer pad 8 and the buffer bushing 6 do not contact the upper cover 1, the limit ring 7 and the base 3, so that when the vibration isolation module is working, the high-rigidity impact-resistant limit buffer module does not work, and a low-frequency vibration isolation buffer design of the vibration isolation device under low-value vibration loads can be realized.

[0074] When subjected to a high-value impact load, the vibration damping pad 5 is compressed, and the axial and radial deformations are greater than the reserved displacement space. The buffer pad 8 is in axial contact with the upper cover 1, the buffer bushing 6 is in axial contact with the limit ring 7, and the buffer bushing 6 is in radial contact with the base 3 and the limit ring 7. At this time, the low-rigidity vibration isolation module continues to work to provide damping, and the high-rigidity impact-resistant limit buffer module starts to work. The high and low stiffness modules work together to store and absorb the energy peak of the impact, thereby realizing a three-axial buffering and limiting effect.

[0075] In some embodiments of the present application, the buffer pad 8 and the buffer bushing 6 can be elastic elements made of various materials with the same effect, such as rubber.

[0076] This application can effectively solve the use requirements of weapons and aerospace equipment in a complex working environment of vibration and high-value impact and the use requirements of vibration reduction and buffering functions; adopts a combined stiffness design, the low stiffness module realizes the low-frequency vibration isolation and buffering function in the vibration environment, and the high stiffness module realizes the function of limiting and buffering the impact of large values; adopts a design structure of an arc-shaped force-bearing surface to increase the force-bearing surface, provide radial load distribution, and increase radial stiffness, so that the vibration isolation device has better vibration isolation and buffering function during use; the shape of the arc-shaped vibration damping pad decomposes the force on the arc-shaped contact surface into radial force, provides shear damping, and realizes a composite high damping design with friction damping to store and absorb energy peaks of vibration and impact.

[0077] The limit buffer vibration isolation device of the present application has a simple structure and is easy to implement. The main high and low stiffness functional modules have clear boundaries. It has both vibration isolation and buffering and impact resistance and limiting functions, and can be used for buffering and limiting in pyrotechnic impact environments. The design structure of the arc-shaped support surface inside the vibration isolation device provides radial load sharing and increases radial stiffness. This structural form overcomes the shortcoming of the conventional wire mesh vibration isolator with small radial stiffness. Each functional module of the vibration isolation device can be designed and functioned independently, and the design requirements of high and low frequencies can be met as needed. The device is suitable for complex working conditions with limited working space requirements, two loads of vibration and impact, but not acting at the same time, and for vibration isolation and buffering fields such as vehicle-mounted and airborne weapon equipment, satellite-borne equipment, etc., which have high requirements on the stability, reliability and durability of the equipment.

[0078] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A limit buffer vibration isolation device, characterized in that: include: An upper cover having a stepped hole structure formed therein, wherein one side of the stepped hole structure is open and the other side is provided with a through hole connected to the stepped hole; a lower cover, the lower cover being fixedly connected to the upper cover to form a cavity; a buffer bushing, the buffer bushing being disposed in the cavity and being adapted to fit the upper cover and the lower cover; a core shaft, one end of which is installed in the through hole and the other end of which partially passes through the cavity, thereby forming an annular cavity between the upper cover, the lower cover and the core shaft; A base, the base being disposed in the annular cavity and having a radially extending protrusion disposed therein, thereby forming an upper cavity and a lower cavity distributed vertically between the base and the core shaft; Vibration-damping pads, the vibration-damping pads being arranged in the upper cavity and the lower cavity; A limiting ring is installed at one end of the base located in the annular cavity and is limited in the annular cavity by the buffer bushing.

2. The position limiting buffering and vibration isolation device according to claim 1, characterized in that: The stepped hole structure of the upper cover is configured to form a flat surface with a larger diameter and a first arc surface with a smaller diameter. The end surface of the upper cover is provided with a first mounting hole for controlling the rotation of the upper cover.

3. The position limiting buffering and vibration isolating device according to claim 2, characterized in that: The lower cover is a tubular step structure, and the lower cover is connected to the upper cover via a threaded structure.

4. The position limiting buffering and vibration isolating device according to claim 3, characterized in that: A radially extending base flange is provided on one side of the base, and a base fixing hole for connecting to a fixed foundation is provided on the base flange; A second mounting hole for controlling the rotation of the base is provided on the side wall of the base body close to the base flange.

5. The position limiting, buffering and vibration isolating device according to claim 4, characterized in that: The protrusion is inclined toward a side away from the base flange, and the protrusion is an arc-shaped structure, with an upper arc surface and a lower arc surface formed on both sides of the protrusion.

6. The position limiting buffering and vibration isolating device according to claim 5, characterized in that: One side of the core shaft is provided with a radially extending core shaft flange, and one side surface of the core shaft flange is an arc surface, which forms a limiting structure for the vibration damping pad arranged in the lower cavity.

7. The position limiting, buffering and vibration isolating device according to claim 6, characterized in that: The upper and lower surfaces of the vibration damping pad are both arc-shaped and adapted to the arc surfaces on the upper cover, the protrusion and the core shaft flange.

8. The position limiting, buffering and vibration isolating device according to claim 7, characterized in that: The vibration damping pad is formed by pressing a metal mesh.

9. The position limiting, buffering and vibration isolating device according to any one of claims 1 to 8, characterized in that: It also includes a buffer pad, which is arranged on the limiting ring.

10. The position limiting, buffering and vibration isolating device according to claim 9, characterized in that: There is an axial displacement space between the upper surface of the buffer pad and the flat surface of the upper cover, and there is an axial displacement space between the lower part of the limit ring and the step surface of the buffer bushing; there is a radial displacement space between the buffer bushing, the limit ring and the base.

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