A vibration isolation gimbal based on non-newtonian fluid damper
By constructing a multi-stage vibration isolation gimbal using non-Newtonian fluid dampers and torsion springs, the problem of insufficient vibration isolation of traditional gimbals in complex vibration environments is solved, achieving multi-stage vibration attenuation and maintainability, and adapting to complex vibration environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNMING UNIV OF SCI & TECH
- Filing Date
- 2026-05-24
- Publication Date
- 2026-07-03
AI Technical Summary
Existing gimbal vibration isolation structures suffer from reduced vibration isolation performance when facing complex vibration environments. They lack sufficient low-frequency vibration isolation capability and high-frequency vibration attenuation. Furthermore, traditional single-stage vibration isolation structures are ill-suited to the challenges of a wide range of external excitation frequencies and complex vibration directions.
A multi-stage vibration isolation gimbal based on a non-Newtonian fluid damper is adopted. The vibration isolation unit is constructed by the non-Newtonian fluid damper and combined with torsion springs and variable length connecting rods to form a multi-stage vibration isolation structure, thereby achieving a multi-parameter combined vibration isolation effect.
It improves the gimbal's adaptability to complex vibration environments, achieves gradual attenuation of multi-level vibration transmission paths, enhances the vibration isolation effect on precision camera units, and has maintainability and multi-level vibration isolation capabilities.
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Figure CN122328495A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a vibration isolation gimbal based on a non-Newtonian fluid damper, belonging to the field of vibration isolation. Background Technology
[0002] With the development of drones, vehicle-mounted observation equipment, shipborne equipment, robot vision systems, and portable optoelectronic detection equipment, gimbals, as mounting and attitude stabilization platforms for payloads such as cameras, optoelectronic pods, sensors, and laser rangefinders, are widely used in fields such as aerial surveying, target tracking, environmental monitoring, security inspection, and precision measurement. During operation, gimbals typically need to be mounted on a moving platform. This moving platform is subject to factors such as engine vibration, propeller excitation, ground impact, attitude changes, wind disturbance, and structural resonance, causing the gimbal and the equipment it supports to vibrate in different directions, at different frequencies, and with different amplitudes.
[0003] Existing gimbal vibration isolation structures mostly employ methods such as rubber damping balls, elastic pads, damping rings, spring supports, or single-stage damping components for vibration reduction. While these structures can weaken vibration transmission to some extent, their isolation parameters are usually relatively fixed, and their structural forms are relatively simple, primarily targeting isolation of vibrations in a specific direction or frequency band. When the external excitation frequency range is wide, the vibration direction is complex, or the load mass changes, traditional single-stage vibration isolation structures are prone to problems such as decreased vibration isolation effect, insufficient low-frequency isolation capability, inadequate high-frequency vibration attenuation, and excessive impact response. Summary of the Invention
[0004] The present invention provides a vibration isolation gimbal based on a non-Newtonian fluid damper, which is used to construct vibration isolation units through non-Newtonian fluid dampers, and further form a multi-level vibration isolation gimbal based on multiple vibration isolation units.
[0005] The technical solution of this invention is:
[0006] A vibration isolation gimbal based on a non-Newtonian fluid damper employs one or more vibration isolation units; each vibration isolation unit includes a connecting shaft 1, a connecting piece I2, a torsion spring 3, a connecting piece II4, a non-Newtonian fluid damper 5, a connecting block 6, and a variable length connecting rod 7.
[0007] One end of the connecting shaft 1 is machined with a first connecting part for connecting with the connecting piece I2; the other end of the connecting shaft 1 is machined with a central hole for cooperating with the damper cylinder 11 of the non-Newtonian damper 5.
[0008] The connector I2 includes a first mounting base and a first vertical plate; the first mounting base has a first internal threaded hole machined on one side and a first waist-shaped through hole provided on the same side as the first internal threaded hole, the first waist-shaped through hole being used to cooperate with one end of the torsion spring 3 sleeved on the connecting shaft 1; the first vertical plate is mounted on the other side of the first mounting base in a vertical arrangement, and the first vertical plate has a second internal threaded through hole perpendicular to the axis of the first internal threaded hole, the second internal threaded through hole being used to cooperate with the first connecting part of the connecting shaft 1 for connection;
[0009] The connecting component II4 includes a second mounting base and a second upright plate; a third internal threaded hole is machined on one side of the second mounting base and a second oblong through hole is provided on one side of the third internal threaded hole, the second oblong through hole being used to mate with the other end of the torsion spring 3; a second upright plate arranged vertically is mounted on the other side of the second mounting base, a boss is provided on the side of the second upright plate away from the second oblong through hole, and the boss and the second upright plate together have a receiving portion, the other end of the connecting shaft 1 is received and connected to one end of the damper cylinder 11 within the receiving portion;
[0010] The connecting block 6 is used to cooperate with the damper rotating part 13 and the boss of the non-Newtonian fluid damper 5.
[0011] For a single vibration isolation unit, one of the first internal threaded hole and the third threaded hole is selected for threaded connection with one end of the variable length connecting rod 7, and the other end of the variable length connecting rod 7 is used as the first end of the single vibration isolation unit; the threaded hole in the first internal threaded hole and the third threaded hole that is not connected to the variable length connecting rod 7 is used as the second end of the single vibration isolation unit.
[0012] Furthermore, when multiple vibration isolation units are used, the multiple vibration isolation units are connected in sequence. For two adjacent vibration isolation units, the first end of one vibration isolation unit is connected to the second end of the other vibration isolation unit.
[0013] Furthermore, the variable length connecting rod 7 is composed of connecting rod I9 and connecting rod II10. One end of connecting rod I9 is provided with a fourth internal threaded hole, and one end of connecting rod II10 is provided with an external threaded section that mates with the fourth internal threaded hole. The external threaded section is screwed into the fourth internal threaded hole to form a threaded pair connection. The other end of connecting rod I9 and connecting rod II10 is provided with a second connecting part.
[0014] Furthermore, the non-Newtonian fluid damper 5 is composed of a damper cylinder 11, a damper cover 12, and a damper rotating member 13; the damper cylinder 11 and the damper cover 12 for opening / closing the damper cylinder 11 cooperate to form a cavity structure; at least a portion of the damper rotating member 13, which is sleeved on the stepped cylindrical shaft of the damper cylinder 11, extends out of the damper cover 12, and one end of the damper rotating member 13 extending into the cavity structure is provided with a baffle structure arranged at intervals from the cavity structure along the radial direction of the damper rotating member 13; the end of the damper rotating member 13 extending out of the damper cover 12 is interference-connected to the central through hole of the connecting block 6.
[0015] Furthermore, the damper cylinder 11 is a hollow cylindrical shell with one end open. The upper part of the inner wall of the hollow cylindrical shell is machined with internal threads for threaded connection with the damper cover 12 to realize the opening / closing of the damper cylinder 11. On the central axis of the damper cylinder 11, a stepped cylindrical shaft extends vertically upward from the bottom of the hollow cylindrical shell. The stepped cylindrical shaft serves as the rotation center axis of the damper rotating component 13 and is interference-fitted with the connecting shaft 1.
[0016] Furthermore, the end of the damper cover 12 away from the damper cylinder 11 adopts a regular hexagonal flange structure, and the end closer to the damper cylinder 11 is machined with external threads for threaded connection with the damper cylinder 11. A through coaxial stepped hole is machined along the central axis of the damper cover 12, forming a countersunk hole structure for installing the bearing 14. The outer ring of the bearing 14 is interference-fitted with the damper cover 12, and the inner ring of the bearing 14 is interference-fitted with the damper rotating part 13.
[0017] Furthermore, the first end of the vibration isolation unit at the beginning and end of the non-Newtonian fluid damper's vibration isolation gimbal is designated as the first free end, and the other end as the second free end. When the non-Newtonian fluid damper's vibration isolation gimbal is used for vibration isolation of the target equipment, an external equipment connector constructed from a variable-length connecting rod 7 and a connector II4 is provided. The external equipment connector adopts at least two of the following installation methods:
[0018] The first method involves threading the first free end to the preset internal thread hole on the fixed support 8, and then sequentially connecting the second free end to the variable length connecting rod 7 and the connecting part II4 in the external equipment connector, and then connecting it to the slider 15 on the fixed support 8 via the second vertical plate of the connecting part II4. The target equipment is then fixedly installed on the boss side of the connecting part II4 in the external equipment connector.
[0019] The second method involves connecting the first free end to the second vertical plate of the connector II4 in the external equipment connector and the slider 15 on the fixed support 8, which is in sliding fit. The target equipment is fixedly installed on the boss side of the second vertical plate of the connector II4 in the external equipment connector. The second free end is threadedly connected to the preset internal thread hole on the fixed support 8 through the variable length connecting rod 7 in the external equipment connector.
[0020] The beneficial effects of this invention are as follows: The vibration isolation pan-tilt unit of this invention is mainly constructed using vibration isolation units based on torsion springs, variable-length connecting rods, and non-Newtonian fluid dampers. This allows the vibration isolation units to simultaneously possess elastic reset and damping energy dissipation functions. Furthermore, the materials of the vibration isolation units are easily replaceable, enabling the pan-tilt unit to maintain its functionality. Further, by changing parameters such as the number of vibration isolation units, rod length, torsion spring stiffness, and non-Newtonian fluid damping, multi-level and multi-parameter combined vibration isolation effects can be achieved, thereby improving the pan-tilt unit's adaptability to complex vibration environments. For a pan-tilt unit formed by multiple vibration isolation units, it possesses multi-level vibration transmission paths, allowing vibration to attenuate progressively through multiple nodes during transmission, achieving vibration isolation for the precision camera unit under vibration and impact. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a single vibration isolation unit of the present invention.
[0022] Figure 2 This is an isometric perspective view of the two vibration isolation units of the present invention.
[0023] Figure 3 Cross-sectional view of the connection of the non-Newtonian fluid damper in the vibration isolation unit.
[0024] Figure 4 This is a schematic diagram of the connecting shaft structure.
[0025] Figure 5 This is a schematic diagram of connector I.
[0026] Figure 6 This is a schematic diagram of connector II.
[0027] Figure 7 This is a schematic diagram of the connecting block structure.
[0028] Figure 8 This is a schematic diagram of the connecting rod I structure of the present invention.
[0029] Figure 9 This is a schematic diagram of the connecting rod II structure of the present invention.
[0030] Figure 10 This is a schematic diagram of the variable length connecting rod structure of the present invention.
[0031] Figure 11 This is a schematic diagram of the non-Newtonian fluid damper of the present invention.
[0032] Figure 12 This is a full sectional view of the non-Newtonian fluid damper of the present invention.
[0033] Figure 13 This is a schematic diagram of the damper cover structure.
[0034] Figure 14 This is a schematic diagram of the damper cylinder structure.
[0035] Figure 15 This is a schematic diagram of the rotating component of the damper.
[0036] Figure 16 This is a front view schematic diagram of the vibration isolation gimbal for the secondary vibration isolation unit.
[0037] Figure 17 This is a schematic diagram of the isolating gimbal of the secondary vibration isolation unit.
[0038] Figure 18 This is a schematic diagram of a fixed support structure.
[0039] Figure 19 This is a schematic diagram of the slider structure.
[0040] The labels in the diagram are as follows: 1-Connecting shaft; 2-Connector I; 3-Torsion spring; 4-Connector II; 5-Non-Newtonian fluid damper; 6-Connecting block; 7-Variable length connecting rod; 8-Fixed support; 9-Connecting rod I; 10-Connecting rod II; 11-Damper cylinder; 12-Damper cover; 13-Damper rotating component; 14-Bearing; 15-Slider. Detailed Implementation
[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.
[0042] Example 1: As Figures 1-19 As shown, a vibration isolation gimbal based on a non-Newtonian fluid damper employs one or more vibration isolation units; each vibration isolation unit includes a connecting shaft 1, a connecting piece I2, a torsion spring 3, a connecting piece II4, a non-Newtonian fluid damper 5, a connecting block 6, and a variable-length connecting rod 7.
[0043] One end of the connecting shaft 1 is machined with a first connecting part (external thread) for connecting with the connecting piece I2; the other end of the connecting shaft 1 is machined with a central hole for interference fit with the damper cylinder 11 of the non-Newton damper 5.
[0044] The connector I2 includes a first mounting base and a first vertical plate; the first mounting base has a first internal threaded hole machined on one side and a first waist-shaped through hole provided on the same side as the first internal threaded hole, the first waist-shaped through hole being used to engage with one end of a torsion spring 3 sleeved on the connecting shaft 1; the first vertical plate is mounted on the other side of the first mounting base in a vertical arrangement, and the first vertical plate has a second internal threaded through hole perpendicular to the axis of the first internal threaded hole, the second internal threaded through hole being used to engage with the external thread of the connecting shaft 1;
[0045] The connecting component II4 includes a second mounting base and a second vertical plate; a third internal threaded hole is machined on one side of the second mounting base and a second oblong through hole is provided on one side of the third internal threaded hole, the second oblong through hole is used to cooperate with the other end of the torsion spring 3; a second vertical plate is mounted on the other side of the second mounting base in a vertical arrangement, a boss is provided on the side of the second vertical plate away from the second oblong through hole, and the boss and the second vertical plate form an integral receiving part (coaxial stepped through hole), the other end of the connecting shaft 1 is received and connected to one end of the damper cylinder 11 in the receiving part;
[0046] The connecting block 6 is used for interference fit with the damper rotating part 13 and the boss of the non-Newtonian fluid damper 5.
[0047] For a single vibration isolation unit, one of the first internal threaded hole and the third threaded hole is selected for threaded connection with one end of the variable length connecting rod 7, and the other end of the variable length connecting rod 7 is used as the first end of the single vibration isolation unit; the threaded hole in the first internal threaded hole and the third threaded hole that is not connected to the variable length connecting rod 7 is used as the second end of the single vibration isolation unit.
[0048] Furthermore, the following explanation is provided in conjunction with the accompanying drawings:
[0049] Combined with appendix Figure 1 As shown, connector I2 is used to connect to connecting shaft 1 and torsion spring 3, and connector II4 is used to connect to torsion spring 3 and connecting block 6.
[0050] Combined with appendix Figure 4 As shown, the surface of the connecting shaft 1 is machined with threads, and a center hole is machined at the end without threads for interference connection with the damper cylinder 11 of the non-Newton damper 5.
[0051] Combined with appendix Figure 5 and attached Figure 6As shown, the lower half of connector I2 is a cylindrical mounting base, serving as a support and mounting foundation. A thread is machined at the center of the bottom for threaded connection with the variable length connecting rod 7. Two symmetrically arranged oblong through holes are machined on the side of the mounting base for mating with one end of the torsion spring 3. The two symmetrically arranged oblong through holes can reduce the weight of connector I2. At the same time, when the installation direction is changed by changing the rotation direction of the torsion spring 3, a mounting hole is provided for one end of the torsion spring 3, and the torsion arm of one end of the torsion spring 3 is inserted into the oblong through hole. The upper half of connector I2 is a vertically arranged arc-shaped plate with an internally threaded through hole machined at the center for connection with the connecting shaft 1. The lower half of connector II4 is a cylindrical mounting base, serving as a support and installation foundation. A thread is machined at the center of the bottom for threaded connection with the variable-length connecting rod 7. Two symmetrically arranged oblong through holes are machined on the side of the mounting base for mating with the other end of the torsion spring 3. These symmetrical oblong through holes reduce the weight of connector II4 and also provide mounting holes for the other end of the torsion spring 3 when changing its rotation direction to alter the installation orientation. The torsion arm of the other end of the torsion spring 3 is inserted into the oblong through holes. The upper half of connector II4 is a vertically arranged arc-shaped plate. A boss is machined on one side of the arc-shaped plate for connection with the connecting block 6. The entire plate is machined with coaxial stepped through holes for connecting various parts and installing bearings without affecting rotation.
[0052] Combined with appendix Figure 7 As shown, the connecting block 6 is a hollow cylindrical shell with one end open, and the non-open end is provided with a central through hole for connecting the damper rotating part 13 of the non-Newton damper 5.
[0053] Furthermore, when using multiple vibration isolation units, the multiple vibration isolation units are connected in sequence. For two adjacent vibration isolation units, the first end of one vibration isolation unit is connected to the second end of the other vibration isolation unit. For example, the first end of the Nth vibration isolation unit is connected to the second end of the (N+1)th vibration isolation unit, the first end of the (N+1)th vibration isolation unit is connected to the second end of the (N+2)th vibration isolation unit, and so on (N≥1).
[0054] For example, such as Figure 1 As shown, a single vibration isolation unit is illustrated, with one end of the variable-length connecting rod 7 threaded into the third threaded hole, and the other end of the variable-length connecting rod 7 serving as the first end of the single vibration isolation unit; the first internal threaded hole serves as the second end of the single vibration isolation unit. Figure 2As shown, two vibration isolation units are illustrated. The lower vibration isolation unit in the figure is described as the first vibration isolation unit. The first end of the first vibration isolation unit is connected to the second end of the second vibration isolation unit. At this point, the second end of the first vibration isolation unit and the first end of the second vibration isolation unit are the two free ends under the vibration isolation platform of the non-Newtonian fluid damper constructed from the two vibration isolation units. When selecting a single vibration isolation unit, the first threaded hole is threaded to one end of the variable-length connecting rod 7, and the other end of the variable-length connecting rod 7 is also used as the first end of the single vibration isolation unit; the third internal threaded hole is used as the second end of the single vibration isolation unit.
[0055] When installing a vibration isolation unit, first, the damper rotating part 13 of the non-Newtonian fluid damper 5 is interference-fitted onto the central through hole of the connecting block 6. It is worth noting that there is a gap (approximately 1-2 mm) between the end of the connecting block 6 near the non-Newtonian fluid damper 5 and the end of the damper cover 12 near the connecting block 6. This design does not affect the connection effect or the subsequent disassembly and maintenance of the non-Newtonian fluid damper 5. Next, the connecting block 6 is connected to the connecting part II4. The bosses of the connecting block 6 and the connecting part II4 are connected by an interference fit. The minimum diameter of the stepped through hole of the connecting part II4 is slightly larger than the diameter of the damper rotating part 13 and also slightly larger than the diameter of the connecting shaft 1, thereby reducing the impact on the rotation effect. Next, connect the connecting shaft 1 and the connecting part I2 with threads, ensuring that the connecting shaft 1 is fully screwed into the connecting part I2. Install the torsion spring 3, fitting it onto the connecting shaft 1. One end of the torsion spring 3 is inserted into the oblong hole of the connecting part I2, while the other end is inserted into the oblong hole of the connecting part II4. Finally, connect the stepped cylindrical shaft of the non-Newtonian fluid damper 5 to the connecting shaft 1 with an interference fit. Then, rotate and adjust the connecting shaft 1 to position it appropriately. Threading the variable length connecting rod 7 to the connecting part II4 completes the installation of one vibration isolation unit. After installation, a mounting nut can be screwed onto the connecting shaft 1 to ensure the tightness and reliability of the entire vibration isolation unit installation.
[0056] The direction of the variable-length connecting rod 7 of the vibration isolation unit can be changed by using a left-hand or right-hand torsion spring 3, which can be selected as needed. Rotating the adjusting connecting shaft 1 can adjust the distance between the center of connector I2 and the center of connector II4, which can better adapt to the distance changes caused by changing the stiffness of the torsion spring 3 by changing the number of turns of the torsion spring 3. The variable range of the vertical distance between the center of connector I2 and the center of connector II4 is 10~20 mm.
[0057] Further, refer to Figure 8 , Figure 9 and Figure 10As shown, the variable length connecting rod 7 consists of connecting rod I9 and connecting rod II10. One end of connecting rod I9 has a fourth internal threaded hole, and one end of connecting rod II10 has an external threaded section that mates with the fourth internal threaded hole. The external threaded section is screwed into the fourth internal threaded hole to form a threaded connection. By rotating connecting rod I9 and connecting rod II10 relative to each other, the external threaded section can be screwed into or out of the internal threaded hole axially, thereby achieving adjustment and self-locking of the overall effective length of connecting rod I9 and connecting rod II10. The other end of connecting rod I9 and connecting rod II10 has a second connecting part. The second connecting part uses external threads and can be used to connect with preset internal threaded holes on connecting member I2, connecting member II4, and fixed support 8 as needed. Exemplarily, the variable length connecting rod 7 achieves its variable length function through the length of the threaded connection between connecting rod I9 and connecting rod II10. The variable length range of the variable length connecting rod 7 is 132~160mm, and the length change of the variable length connecting rod 7 can achieve near-zero stiffness of the vibration isolation gimbal.
[0058] Furthermore, such as Figure 11 and Figure 12 As shown, the non-Newtonian fluid damper 5 consists of a damper cylinder 11, a damper cover 12, and a damper rotating member 13. The damper cylinder 11 and the damper cover 12, which is used to open / close the damper cylinder 11, cooperate to form a cavity structure. At least a portion of the damper rotating member 13, which is sleeved on the stepped cylindrical shaft of the damper cylinder 11, extends out of the damper cover 12. One end of the damper rotating member 13 that extends into the cavity structure is provided with a baffle structure arranged at intervals from the cavity structure along the radial direction of the damper rotating member 13. The end of the damper rotating member 13 that extends out of the damper cover 12 is interference-connected to the central through hole of the connecting block 6.
[0059] Furthermore, the damper cylinder 11 is a hollow cylindrical shell with one end open. The upper part of the inner wall of the hollow cylindrical shell is machined with internal threads for threaded connection with the damper cover 12 to realize the opening / closing of the damper cylinder 11. On the central axis of the damper cylinder 11, a stepped cylindrical shaft extends vertically upward from the bottom of the hollow cylindrical shell. The stepped cylindrical shaft serves as the rotation center axis of the damper rotating component 13 and is interference-fitted with the connecting shaft 1.
[0060] Furthermore, the end of the damper cover 12 away from the damper cylinder 11 adopts a regular hexagonal flange structure, which is convenient for wrench clamping to transmit tightening torque. The end closer to the damper cylinder 11 is machined with external threads for threaded connection with the damper cylinder 11. A through coaxial stepped through hole is machined along the central axis of the damper cover 12, forming a countersunk hole structure for installing the bearing 14. The outer ring of the bearing 14 is interference-fitted with the damper cover 12, and the inner ring of the bearing 14 is interference-fitted with the damper rotating part 13.
[0061] Furthermore, the damper rotating component 13 adopts a hollow cylindrical structure; a baffle structure is provided on the outer wall of the hollow cylindrical structure extending into the cavity structure along the radial direction of the cylinder. This baffle structure is used to shear the non-Newtonian fluid damping liquid to generate damping force during rotation; the baffle structure forms a gap with the bottom and inner wall of the damper cylinder 11 and the bottom of the damper cover 12, which shears the damping liquid to generate damping force during the rotation of the damper rotating component 13. The gap size is about 1 mm, and the gap size can be adjusted by adjusting the size of the baffle and the damper cylinder 11.
[0062] Combined with appendix Figure 12 As shown, when installing the non-Newtonian fluid damper 5, first install the bearing 14 onto the damper cover 12. In this embodiment, the bearing 14 is preferably a 606Z bearing. Then, the damper rotating part 13 is sleeved on the stepped cylindrical shaft of the damper cylinder 11, and the damper cylinder 11 is filled with damping fluid (the damping fluid is a non-Newtonian fluid that meets the shear thinning characteristics, such as carboxymethyl cellulose aqueous solution, high-concentration starch paste, natural rubber latex, etc.). Next, the damper cover 12 is threaded through the damper rotating part 13 and installed on the damper cylinder 11, thus completing the installation of the non-Newtonian fluid damper 5.
[0063] For clarity, the first end of the vibration isolation unit at the beginning and end of the non-Newtonian fluid damper's vibration isolation gimbal is designated as the first free end, and the other end as the second free end. When the non-Newtonian fluid damper's vibration isolation gimbal is used for vibration isolation of the target equipment, an external equipment connector constructed from a variable-length connecting rod 7 and connector II4 is provided. The external equipment connector adopts at least two of the following installation methods:
[0064] The first method involves threading the first free end to the preset internal thread hole on the fixed support 8, and then sequentially connecting the second free end to the variable length connecting rod 7 and the connecting part II4 in the external equipment connector, and then connecting it to the slider 15 on the fixed support 8 via the second vertical plate of the connecting part II4. The target equipment is then fixedly installed on the boss side of the connecting part II4 in the external equipment connector.
[0065] The second method involves connecting the first free end to the second vertical plate of the connector II4 in the external equipment connector and the slider 15 on the fixed support 8, which is in sliding fit. The target equipment is fixedly installed on the boss side of the second vertical plate of the connector II4 in the external equipment connector. The second free end is threadedly connected to the preset internal thread hole on the fixed support 8 through the variable length connecting rod 7 in the external equipment connector.
[0066] The following is a further explanation using the second method:
[0067] During use, multiple vibration isolation units can be constructed as needed. As the number of vibration isolation units increases, the vibration isolation performance of the pan-tilt-zoom (PTZ) can be better achieved. Furthermore, using a camera device as the target device, [the following is employed...] Figure 2 The two vibration isolation units shown construct a vibration isolation gimbal for a non-Newtonian fluid damper:
[0068] like Figure 16 and Figure 17 As shown, one end (the second free end) of the overall structure of the two vibration isolation units is threadedly fixed to the fixed support 8 via the variable-length connecting rod 7 in the external equipment connector. The other end (the first free end) is connected to the slider 15 via connector II4 in the external equipment connector. A 606Z bearing is installed in the stepped through hole of connector II4 in the external equipment connector for connection with slider 15, ensuring connection and rotation with slider 15. The precision camera unit bracket is interference-fitted onto the boss of connector II4 to achieve vibration isolation effect for the precision camera unit under vibration and impact using the vibration isolation gimbal based on the non-Newtonian fluid damper of the present invention. The overall structure of the two vibration isolation units described above adopts... Figure 2 The architecture shown.
[0069] like Figure 17 , 18 As shown, the lower part of the fixed support 8 is a handheld cylindrical structure, and the upper part is a fixed platform. The fixed platform is provided with threaded holes for mounting the variable length connecting rod 7 and guide rail structure for mounting the slider 15.
[0070] like Figure 19 As shown, one end of the slider 15 is engaged with the guide rail on the fixed support 8, and the other end has a protruding connecting shaft that can be interference-fitted with the inner ring of the bearing of the connecting piece II4.
[0071] For a vibration isolation unit, the outer ring of the bearing of the non-Newtonian fluid damper 5 is fixed inside the damper cover 12. The damper cover 12 and the damper cylinder 11 are connected together by threads. The damper cylinder 11 is connected to the connecting shaft 1 by an extended stepped cylindrical shaft. The connecting shaft 1 and the connecting piece I2 are connected together by threads. Therefore, the outer ring of the bearing 14 is connected to the damper cover 12, the damper cylinder 11, the connecting shaft 1, and the connecting piece I2. The inner ring of the bearing of the non-Newtonian fluid damper 5 is mounted on the damper rotating part 13. The connecting block 6 is mounted on the damper rotating part 13. The connecting block 6 is connected to the connecting piece II4. Therefore, the inner ring of the bearing is connected to the damper rotating part 13, the connecting block 6, and the connecting piece II4. During the vibration of the vibration isolation gimbal, the camera unit moves up and down along the guide rail. The motion principle of a single vibration isolation unit can be described as follows: it carries the variable-length connecting rod 7, which rotates around the connecting shaft 1. The variable-length connecting rod 7, in turn, drives the connecting piece II4, which in turn drives the torsion spring 3, providing elastic restoring force. The rotation of the connecting piece II4 also drives the rotation of the connecting block 6 and the damper rotating part 13. Therefore, during vibration, the damper rotating part 13 and the damper cylinder 11 rotate relative to each other, shearing the damping fluid and providing damping force. Thus, for multiple vibration isolation units, the up-and-down movement of the camera unit drives the rotation of the variable-length connecting rod 7 and the connecting piece II4 of each vibration isolation unit, thereby achieving the transmission and superposition of the elastic restoring force and damping force of each vibration isolation unit, resulting in better vibration isolation performance.
[0072] As can be seen from the above technical solution, the present invention can achieve quasi-zero stiffness characteristics of the vibration isolation bracket by changing the length of the variable-length connecting rod 7 and the stiffness of the torsion spring 3. At the same time, the torsion spring 3, the 606Z bearing, and the variable-length connecting rod 7 are easily replaceable, thus ensuring the maintainability of the vibration isolation bracket. Therefore, the present invention has the advantages of being easy to manufacture, having low maintenance costs, and providing a wide vibration isolation frequency range, and can be applied to different types of frame structures.
[0073] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A vibration isolation gimbal based on a non-Newtonian fluid damper, characterized in that, One or more vibration isolation units are used; each vibration isolation unit includes a connecting shaft (1), a connecting piece I (2), a torsion spring (3), a connecting piece II (4), a non-Newtonian fluid damper (5), a connecting block (6), and a variable length connecting rod (7); The connecting shaft (1) has a first connecting part machined at one end for connecting to the connecting piece I (2); the connecting shaft (1) has a center hole machined at the other end for cooperating with the damper cylinder (11) of the non-Newtonian damper (5); The connecting component I (2) includes a first mounting base and a first vertical plate; a first internal thread hole is machined on one side of the first mounting base and a first waist-shaped through hole is provided on one side of the first internal thread hole. The first waist-shaped through hole is used to cooperate with one end of the torsion spring (3) sleeved on the connecting shaft (1); a first vertical plate is installed on the other side of the first mounting base in a vertical arrangement, and a second internal thread through hole perpendicular to the axis of the first internal thread hole is opened on the first vertical plate. The second internal thread through hole is used to cooperate with the first connecting part of the connecting shaft (1) for connection. The connecting component II (4) includes a second mounting base and a second vertical plate; a third internal thread hole is machined on one side of the second mounting base and a second waist-shaped through hole is provided on one side of the third internal thread hole, the second waist-shaped through hole is used to cooperate with the other end of the torsion spring (3); a second vertical plate is installed on the other side of the second mounting base in a vertical arrangement, a boss is provided on the side of the second vertical plate away from the second waist-shaped through hole, and the boss and the second vertical plate form an integral receiving part, the other end of the connecting shaft (1) is received and connected to one end of the damper cylinder (11) in the receiving part; The connecting block (6) is used to cooperate with the damper rotating part (13) and boss of the non-Newtonian fluid damper (5); For a single vibration isolation unit, one of the first internal threaded hole and the third threaded hole is selected for threaded connection with one end of the variable length connecting rod (7), and the other end of the variable length connecting rod (7) is used as the first end of the single vibration isolation unit; the threaded hole in the first internal threaded hole and the third threaded hole that is not connected to the variable length connecting rod (7) is used as the second end of the single vibration isolation unit.
2. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 1, characterized in that, When multiple vibration isolation units are used, the multiple vibration isolation units are connected in sequence. For two adjacent vibration isolation units, the first end of one vibration isolation unit is connected to the second end of the other vibration isolation unit.
3. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 1, characterized in that, The variable length connecting rod (7) is composed of connecting rod I (9) and connecting rod II (10). One end of the connecting rod I (9) is provided with a fourth internal thread hole, and one end of the connecting rod II (10) is provided with an external thread section that mates with the fourth internal thread hole. The external thread section is screwed into the fourth internal thread hole to form a threaded pair connection. The other end of the connecting rod I (9) and the connecting rod II (10) is provided with a second connecting part.
4. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 1, characterized in that, The non-Newtonian fluid damper (5) consists of a damper cylinder (11), a damper cover (12), and a damper rotating component (13). The damper cylinder (11) and the damper cover (12) used to open / close the damper cylinder (11) cooperate to form a cavity structure. At least part of the damper rotating component (13) sleeved on the stepped cylindrical shaft of the damper cylinder (11) extends out of the damper cover (12). One end of the damper rotating component (13) extending into the cavity structure is provided with a baffle structure arranged at intervals with the cavity structure along the radial direction of the damper rotating component (13). The end of the damper rotating component (13) extending out of the damper cover (12) is interference-connected to the central through hole of the connecting block (6).
5. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 4, characterized in that, The damper cylinder (11) is a hollow cylindrical shell with one end open. The upper part of the inner wall of the hollow cylindrical shell is machined with internal threads for threaded connection with the damper cover (12) to realize the opening / closing of the damper cylinder (11). On the central axis of the damper cylinder (11), a stepped cylindrical shaft extends vertically upward from the bottom of the hollow cylindrical shell. The stepped cylindrical shaft serves as the rotation center axis of the damper rotating part (13) and is interference-fitted with the connecting shaft (1).
6. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 4, characterized in that, The damper cover (12) has a regular hexagonal flange structure at the end away from the damper cylinder (11), and an external thread is machined at the end near the damper cylinder (11) to achieve a threaded connection with the damper cylinder (11). A through coaxial stepped through hole is machined along the central axis of the damper cover (12), forming a countersunk hole structure for installing the bearing (14). The outer ring of the bearing (14) is interference-fitted with the damper cover (12), and the inner ring of the bearing (14) is interference-fitted with the damper rotating part (13).
7. The vibration isolation gimbal based on a non-Newtonian fluid damper according to claim 1, characterized in that, The first end of the vibration isolation unit at the beginning and end of the non-Newtonian fluid damper is designated as the first free end, and the other end as the second free end. When the vibration isolation unit of the non-Newtonian fluid damper is used for vibration isolation of the target equipment, an external equipment connector constructed from a variable length connecting rod (7) and connector II (4) is provided. The external equipment connector adopts at least the following two installation methods: The first method involves threading the first free end to the preset internal thread hole on the fixed support (8), and then sequentially connecting the second free end to the variable length connecting rod (7) and connecting part II (4) in the external equipment connector, and then connecting the second vertical plate of connecting part II (4) to the slider (15) on the fixed support (8) through sliding fit. The target equipment is fixedly installed on the boss side of connecting part II (4) in the external equipment connector. The second method involves connecting the first free end to the second vertical plate of the connector II (4) in the external equipment connector and the slider (15) on the fixed support (8) in a sliding fit, and fixing the target equipment on the boss side of the second vertical plate of the connector II (4) in the external equipment connector; and threading the second free end to the preset internal thread hole on the fixed support (8) according to the variable length connecting rod (7) in the external equipment connector.