A metal isolator having large bias damping and zero back-damping

Abstract

The application discloses a metal vibration isolator with large bias damping and zero return damping, and belongs to the technical field of damping vibration isolation. The metal vibration isolator comprises a shell, a lifting rod, a vibration isolation spring, a rack, a rotating shaft A, a rotating shaft B, a chain wheel A, a chain wheel B, a gear A, a gear B, a damping element and a transmission chain. The damping element comprises a damping groove in the shape of a circle formed on the shell, a rotating shaft C and a positioning block fixedly arranged at the center of the damping groove, a damping frame rotatably arranged on the rotating shaft C and having damping sliding blocks hingedly arranged at both ends, a chain wheel C fixedly arranged on the damping frame, an elastic damping ring non-contactingly sleeved outside the positioning block in the damping groove, and a plurality of stretchable rods which are distributed in an axial symmetry and have two ends connected with the elastic damping ring and the positioning block respectively. The metal vibration isolator has the advantages of reasonable structure, large bias damping force, zero return damping force, fast energy dissipation and balance reset function.

Description

Technical Field

[0001] This invention mainly relates to the field of damping and vibration isolation technology, specifically a metal vibration isolator with large offset damping and zero backflush damping. Background Technology

[0002] Metal vibration isolators are widely used due to their excellent vibration isolation effect, typically in vibration and shock isolation. Traditional metal vibration isolators rely on elastic elements for isolation, but their damping force is very small and cannot quickly dissipate energy. While existing metal vibration isolators can generate a certain amount of damping force, this force is a single-valued function of displacement—meaning the damping force is almost exactly equal in the return and offset motions of the isolated equipment. This limits the damping force in the isolator from being too large, as it would affect the reset accuracy of the elastic element. Therefore, designing a metal vibration isolator with a significant difference in damping force between the return and offset motions has significant application value. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in view of the technical problems existing in the prior art, the present invention provides a metal vibration isolator with reasonable structure, capable of achieving large offset damping force and zero backlash damping force, and having rapid energy dissipation and balance reset functions.

[0004] To solve the above problems, the solution proposed in this invention is: a metal vibration isolator with large bias damping and zero backlash damping, comprising a housing, a lifting rod slidably installed inside the housing and having a connecting plate at its extended end, and vibration isolation springs located inside the housing and connected to the lifting rod and the housing respectively at both ends.

[0005] The invention further includes: a rack fixedly mounted on the lifting rod; two rotating shafts A and B rotatably mounted inside the housing and parallel to each other; sprockets A and B fixedly mounted on the rotating shafts A and B respectively; a gear A rotatably mounted on the rotating shaft A and capable of meshing with the rack; a gear B rotatably mounted on the rotating shaft B and capable of meshing with the rack; a damping element mounted inside the housing for generating frictional damping; and a transmission chain that transmits the rotation of the sprockets A and B to the damping element and causes the damping element to operate.

[0006] The damping element includes: a circular damping groove formed on the outer shell; a rotating shaft C and a positioning block fixedly mounted at the center of the damping groove; a damping frame rotatably mounted on the rotating shaft C and with damping sliders hinged at both ends; a sprocket C fixedly mounted on the damping frame; an elastic damping ring non-contactly fitted outside the positioning block and mounted in the damping groove; and several telescopic rods symmetrically distributed on an axis and connected at both ends to the elastic damping ring and the positioning block, respectively.

[0007] When the lifting rod is in a static equilibrium position, gears A and B are exactly engaged with the two ends of the rack, respectively; when the rack moves upward from the static equilibrium position, sprocket A drives sprocket C to rotate clockwise; when the rack moves downward from the static equilibrium position, sprocket B drives sprocket C to rotate counterclockwise.

[0008] Furthermore, the initial shape of the elastic damping ring is annular, and the radius difference between the damping groove and the elastic damping ring is smaller than the width of the damping slider.

[0009] Furthermore, the contact surfaces of the damping slider with the elastic damping ring and the damping groove are provided with uneven contact points; the outer surface of the elastic damping ring and the inner surface of the damping groove are provided with uneven contact points.

[0010] Furthermore, the transmission chain includes: chain A that connects sprocket C and sprocket A in the same direction, and chain B that connects sprocket C and sprocket B in the same direction.

[0011] Furthermore, the line connecting the two damping sliders coincides with one of the diameter lines of the damping groove.

[0012] Furthermore, the vibration isolation spring is a metal helical spring with equal tensile and compressive stiffness.

[0013] Furthermore, gear A is mounted on shaft A using a one-way bearing A, and gear B is mounted on shaft B using a one-way bearing B; when gear A rotates clockwise, one-way bearing A is in a "stopped" state; when gear B rotates counterclockwise, one-way bearing B is in a "stopped" state.

[0014] Compared with existing technologies, this invention has the following advantages and beneficial effects: A metal vibration isolator with large offset damping and zero backlash damping is provided with gears A and B, which are engaged or disengaged from a rack and rotate in one direction. This allows the isolated equipment to drive the sprocket C to rotate via the rack movement during offset motion, causing the damping slider to slide relative to the damping groove and the elastic damping ring, generating a large damping force composed of frictional damping force and internal frictional damping force. During the return motion, the transmission connection between the rack movement and the sprocket C is severed, causing the damping slider to remain stationary in the damping groove, achieving a zero-damping effect during the return motion. Therefore, this invention is a metal vibration isolator with a reasonable structure, capable of achieving large offset damping force and zero backlash damping force, and possessing rapid energy dissipation and balance reset functions. Attached Figure Description

[0015] Figure 1This is a schematic diagram illustrating the structural principle of a metal vibration isolator with large bias damping and zero backflush damping according to the present invention.

[0016] Figure 2 This is a schematic diagram illustrating the installation principle of gear A and sprocket A in this invention.

[0017] Figure 3 This is a schematic diagram illustrating the installation principle of gear B and sprocket B in this invention.

[0018] Figure 4 This is a schematic diagram of the connection between the positioning block and the elastic damping ring in this invention.

[0019] Figure 5 This is a schematic diagram of the connection between the damping frame and the damping slider in this invention.

[0020] In the diagram, 10—outer shell; 11—lifting rod; 12—connecting plate; 13—vibration isolation spring; 14—linear guide rail; 15—slider; 20—rack; 21—gear A; 22—gear B; 23—sprocket A; 24—sprocket B; 25—shaft A; 26—shaft B; 27—one-way bearing A; 28—one-way bearing B; 31—chain A; 32—chain B; 40—damping groove; 41—elastic damping ring; 42—damping slider; 43—damping frame; 44—sprocket C; 45—telescopic rod; 46—positioning block; 47—shaft C. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. For ease of description, the vertical direction is defined as the Z-axis direction in the present invention. Figure 1 The direction perpendicular to the paper is the Y-axis, and the direction perpendicular to both the Y and Z axes is the X-axis; the direction of rotation is... Figure 1 The perspective in the text is used as a reference.

[0022] See Figures 1 to 3The present invention discloses a metal vibration isolator with large bias damping and zero backlash damping, comprising a housing 10, a lifting rod 11 slidably mounted inside the housing 10 and having a connecting plate 12 at its extended end, vibration isolation springs 13 located inside the housing 10 and connected at both ends to the lifting rod 11 and the housing 10 respectively, a rack 20 fixedly mounted on the lifting rod 11, rotating shafts A25 and B26 rotatably mounted inside the housing 10 and parallel to each other, sprockets A23 and B24 fixedly mounted on the rotating shafts A25 and B26 respectively, a gear A21 rotatably mounted on the rotating shaft A25 and meshing with the rack 20, a gear B22 rotatably mounted on the rotating shaft B26 and meshing with the rack 20, a damping element mounted inside the housing 10 for generating frictional damping, and a transmission chain for transmitting the rotation of the sprockets A23 and B24 to the damping element and causing the damping element to operate. In specific implementation, the vibration-isolated equipment is fixedly connected to the connecting plate 12; the outer shell 10 is an internal hollow cuboid composed of a front side plate, a rear side plate, a left side plate, a right side plate, a top plate, and a bottom plate; a linear guide rail 14 is fixedly installed on the side of the rear side plate facing the front side plate along the Z-axis direction, and two linear sliders 15 are slidably installed on the linear guide rail 14, and the lifting rod 11 is fixedly connected to the two linear sliders 15; a rod hole is opened on the top plate of the outer shell 10 to allow the lifting rod 11 to pass through; the rotating shaft A25 and the rotating shaft B26 are rotatably installed on the front side plate and the rear side plate along the Y-axis direction; the stiffness of the vibration isolation spring 13 is selected according to the weight of the vibration-isolated equipment, so that when the lifting rod 11 is in the static equilibrium position, the gears A21 and B22 are exactly located at both ends of the rack 20. Therefore, during the lifting motion of the lifting rod 11, at the same moment, when the rack 20 meshes with one of the gears A21 and B22, it will inevitably disengage and mesh with the other gear.

[0023] See Figure 1 , Figure 4 and Figure 5The damping element includes: a circular damping groove 40 formed on the outer shell 10; a rotating shaft C47 and a positioning block 46 fixedly installed at the center of the damping groove 40; a damping frame 43 rotatably installed on the rotating shaft C47 and with damping sliders 42 hinged at both ends; a sprocket C44 fixedly installed on the damping frame 43; an elastic damping ring 41 installed in the damping groove 40 and non-contactly fitted outside the positioning block 46; and several telescopic rods 45 symmetrically distributed on the axis and connected at both ends to the elastic damping ring 41 and the positioning block 46 respectively. In specific implementation, the damping groove 40 is opened on the rear side plate, the rotating shaft C47 is installed along the Y-axis, and the positioning block 46, sprocket C44 and rotating shaft C47 are installed coaxially; the telescopic rod 45 is composed of a hollow rod and a solid rod, one end of the hollow rod is fixedly connected to the elastic damping ring 41, and the other end is slidably fitted onto one end of the solid rod, and the other end of the solid rod is fixedly connected to the positioning block 46; the rotation of the sprocket C44 drives the damping frame 43 to rotate synchronously, thereby driving the two damping sliders 42 to make circular motion in the damping groove 40. During the movement, damping friction is generated between the damping sliders 42 and the inner wall of the damping groove 40 and the outer wall of the elastic damping ring 41.

[0024] When the lifting rod 11 is in the static equilibrium position, gears A21 and B22 are exactly engaged with the two ends of the rack 20, respectively. When the rack 20 moves upward from the static equilibrium position, sprocket A23 drives sprocket C44 to rotate clockwise. When the rack 20 moves downward from the static equilibrium position, sprocket B24 drives sprocket C44 to rotate counterclockwise. In actual use, when the midpoint of the rack 20 moves up and down above the static equilibrium position, the rack 20 engages with gear A21 and disengages from gear B22. When the midpoint of the rack 20 moves up and down below the static equilibrium position, the rack 20 engages with gear B22 but disengages from gear A21.

[0025] Preferably, the initial shape of the elastic damping ring 41 is annular, and the radius difference between the damping groove 40 and the elastic damping ring 41 is smaller than the width of the damping slider 42.

[0026] Preferably, the contact surfaces of the damping slider 42 with the elastic damping ring 41 and the damping groove 40 are provided with uneven contact points; the outer surface of the elastic damping ring 41 and the inner surface of the damping groove 40 are provided with uneven contact points.

[0027] Preferably, the transmission chain includes: chain A31 that connects sprocket C44 and sprocket A23 in the same direction, and chain B32 that connects sprocket C44 and sprocket B24 in the same direction.

[0028] Preferably, the line connecting the two damping sliders 42 coincides with one of the diameter lines of the damping groove 40.

[0029] Preferably, the vibration isolation spring 13 is a metal helical spring with equal tensile and compressive stiffness.

[0030] Preferably, gear A21 is mounted on shaft A25 using a one-way bearing A27, and gear B22 is mounted on shaft B26 using a one-way bearing B28. When gear A21 rotates clockwise, one-way bearing A27 is in a "stopped" state; when gear B22 rotates counterclockwise, one-way bearing B28 is in a "stopped" state. Specifically, when rack 20 moves upward from its static equilibrium position, gear A21 rotates clockwise, driving shaft A25 and sprocket A23 fixedly mounted on shaft A25 to rotate clockwise using the stopping characteristic of one-way bearing A27. When rack 20 descends towards its static equilibrium position, gear A21 rotates counterclockwise. Since one-way bearing A27 is in a permissible state at this time, gear A21 rotates freely on shaft A25, meaning shaft A25 and sprocket A23 are stationary. When rack 20 moves downward from its static equilibrium position, gear B22 rotates counterclockwise, driving shaft B26 and sprocket B24 fixedly mounted on shaft B26 to rotate counterclockwise by means of the stopping characteristic of one-way bearing B28. When rack 20 moves upward towards its static equilibrium position, gear B22 rotates clockwise. Since one-way bearing B28 is in the permissible state at this time, gear B22 spins freely on shaft B26, that is, shaft B26 and sprocket B24 remain stationary.

[0031] The working principle of the large offset damping of this invention is as follows: The upward or downward movement of the lifting rod 11 from the static equilibrium position is called offset movement, and the movement of the lifting rod 11 towards the static equilibrium position is called return movement. When the lifting rod 11 moves upward from the static equilibrium position, the rack 20 meshes with the gear A21, and the sprocket A23 rotates clockwise, driving the sprocket C44 and the damping slider 42 to rotate clockwise through the chain A31. A huge frictional damping force is generated between the damping slider 42 and the damping groove 40 and the elastic damping ring 41. When the lifting rod 11 moves downward from the static equilibrium position, the rack 20 meshes with the gear B22, and the sprocket B24 rotates counterclockwise, driving the sprocket C44 and the damping slider 42 to rotate counterclockwise through the chain B32. A huge frictional damping force is generated between the damping slider 42 and the damping groove 40 and the elastic damping ring 41. Therefore, the vibration-isolated equipment installed on the connecting plate 12 will be subjected to a huge damping force during the offset movement.

[0032] The working principle of the zero-return damping of this invention is as follows: When the lifting rod 11 descends and moves towards the static equilibrium position, the rack 20 and gear B22 are in a non-meshing state, that is, the rack 20 and gear B22 are not in contact; at the same time, the rack 20 meshes with gear A21 for transmission. During the entire process, gear A21 rotates counterclockwise without moving, while sprockets A23 and C44 remain stationary. Therefore, the damping slider 42 does not slide equally and does not generate damping force. When the lifting rod 11 rises and moves towards the static equilibrium position, the rack 20 and gear A21 are in a non-meshing state, that is, the rack 20 and gear A21 are not in contact; at the same time, the rack 20 meshes with gear B22 for transmission. Gear B22 rotates clockwise without moving, while sprockets B24 and C44 remain stationary. Therefore, there is no relative sliding between the damping slider 42 and the damping groove 40 and no damping force is generated. Thus, the vibration-isolated equipment installed on the connecting plate 12 has no damping force during the return motion.

[0033] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without creative effort should fall within the scope of protection of the present invention.

Claims

1. A metal vibration isolator with large offset damping and zero backflush damping, comprising a housing (10), a lifting rod (11) slidably mounted inside the housing (10) and having a connecting plate (12) at its extended end, and vibration isolation springs (13) located inside the housing (10) and connected at both ends to the lifting rod (11) and the housing (10) respectively; characterized in that, Also includes: A rack (20) fixedly mounted on the lifting rod (11), a rotating shaft A (25) and a rotating shaft B (26) rotatably mounted inside the outer shell (10) and parallel to each other, a sprocket A (23) and a sprocket B (24) fixedly mounted on the rotating shaft A (25) and the rotating shaft B (26) respectively, a gear A (21) rotatably mounted on the rotating shaft A (25) and meshing with the rack (20), a gear B (22) rotatably mounted on the rotating shaft B (26) and meshing with the rack (20), a damping element mounted inside the outer shell (10) for generating frictional damping, and a transmission chain that transmits the rotation of the sprocket A (23) and the sprocket B (24) to the damping element and causes the damping element to work; The damping element includes: a circular damping groove (40) opened on the outer shell (10), a rotating shaft C (47) and a positioning block (46) fixedly installed at the center of the damping groove (40), a damping frame (43) rotatably installed on the rotating shaft C (47) and with damping sliders (42) hinged at both ends, a sprocket C (44) fixedly installed on the damping frame (43), an elastic damping ring (41) installed in the damping groove (40) and non-contactly fitted outside the positioning block (46), and several telescopic rods (45) symmetrically distributed on the axis and connected at both ends to the elastic damping ring (41) and the positioning block (46) respectively. When the lifting rod (11) is in a static equilibrium position, gears A (21) and B (22) are engaged with the two ends of the rack (20) respectively; when the rack (20) moves upward from the static equilibrium position, sprocket A (23) drives sprocket C (44) to rotate clockwise; when the rack (20) moves downward from the static equilibrium position, sprocket B (24) drives sprocket C (44) to rotate counterclockwise. The initial shape of the elastic damping ring (41) is annular, and the radius difference between the damping groove (40) and the elastic damping ring (41) is smaller than the width of the damping slider (42).

2. A metal vibration isolator with large bias damping and zero backflush damping according to claim 1, characterized in that, The contact surfaces of the damping slider (42) with the elastic damping ring (41) and the damping groove (40) are provided with uneven contact points; the outer surface of the elastic damping ring (41) and the inner surface of the damping groove (40) are provided with uneven contact points.

3. A metal vibration isolator with large bias damping and zero backflush damping according to claim 1, characterized in that, The transmission chain includes: chain A (31) that drives the sprocket C (44) and sprocket A (23) in the same direction, and chain B (32) that drives the sprocket C (44) and sprocket B (24) in the same direction.

4. A metal vibration isolator with large bias damping and zero backflush damping according to claim 1, characterized in that, The line connecting the two damping sliders (42) coincides with one of the diameter lines of the damping groove (40).

5. A metal vibration isolator with large bias damping and zero backflush damping according to claim 1, characterized in that, The vibration isolation spring (13) is a metal helical spring with equal tensile and compressive stiffness.

6. A metal vibration isolator with large bias damping and zero backflush damping according to claim 1, characterized in that, The gear A (21) is mounted on the rotating shaft A (25) using a one-way bearing A (27), and the gear B (22) is mounted on the rotating shaft B (26) using a one-way bearing B (28). When the gear A (21) rotates clockwise, the one-way bearing A (27) is in a "stopped" state. When the gear B (22) rotates counterclockwise, the one-way bearing B (28) is in a "stopped" state.

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