Six degree of freedom passive isolator

Abstract

The application relates to a six-degree-of-freedom passive vibration isolator. Spatial six-degree-of-freedom interference includes six directions of X-axis, Y-axis and Z-axis translation and rotation around the X-axis, Y-axis and Z-axis. Vibration interference from a base is transmitted to a main platform through a compression spring quasi-zero stiffness structure composed of four vertical springs between the main platform and an adjusting platform and four horizontal adjusting mechanisms between the main platform and a shell, so that the interference in the Z-axis linear direction and the rotation directions around the X-axis and the Y-axis is isolated and suppressed; the main platform is fixedly connected with a secondary platform through a rigid vertical connecting rod, and the motion state of the secondary platform is consistent with that of the main platform; vibration interference reaching the secondary platform is transmitted to a table top through four Euler compression rods, and the Euler compression rod structure isolates the vibration in the X-axis and Y-axis linear directions and the rotation direction around the Z-axis. After the vibration interference passes through two stages of suppression, the vibration interference is transmitted to a load, and finally the effect of six-degree-of-freedom vibration isolation is achieved, so that the six-degree-of-freedom passive vibration isolator can adapt to a complex vibration interference environment.

Description

Technical Field

[0001] This application relates to the field of vibration control technology, and in particular to six-degree-of-freedom passive vibration isolators. Background Technology

[0002] Currently, there are a large number of steel spring vibration isolators on the market with single degree of freedom, translational and rotational degrees of freedom, and translational three degrees of freedom. These vibration isolators can effectively isolate vibrations under certain interference environments, but they cannot isolate vibrations in more complex vibration interference environments. For example, single-degree-of-freedom vibration isolation devices cannot isolate vibrations in the other five degrees of freedom, and three-degree-of-freedom translational quasi-zero stiffness devices cannot isolate rotational vibrations.

[0003] Six-degree-of-freedom (DOF) passive vibration isolators exist on the market; however, their vibration isolation performance needs improvement. Specifically, some six-DOF passive vibration isolation systems based on the principle of magnetic negative stiffness and Stewart parallel structures exhibit single-degree-of-freedom nonlinear effects and cross-coupling effects between multiple degrees of freedom. Most studies show natural frequencies greater than 6Hz in the rotational direction and greater than 3Hz in the linear direction, indicating a significant performance gap compared to single-degree-of-freedom or two-degree-of-freedom isolators.

[0004] Most existing six-degree-of-freedom passive vibration isolators lack lightweight and compact design or adjustable multi-degree-of-freedom parameters. Some six-degree-of-freedom passive vibration isolators have structural design deficiencies, only capable of isolating loads of a specified weight and lacking parameter adjustability.

[0005] In summary, there is a need for a six-degree-of-freedom passive vibration isolator that is small in size and weight, has adjustable parameters, and can provide strong vibration isolation in complex vibration interference environments. Summary of the Invention

[0006] In order to achieve a strong vibration isolation effect in complex vibration interference environments, this application proposes a six-degree-of-freedom passive vibration isolator.

[0007] A six-degree-of-freedom passive vibration isolator includes:

[0008] The housing is configured to be open at the top, closed at the bottom, and have an inner cavity. The housing includes a bottom plate, and multiple slide rails are provided on the inner wall of the housing near the top surface of the housing. A support plate is fixedly connected to the inner wall of the housing near the bottom surface of the housing. The support plate is parallel to the bottom plate.

[0009] The extension direction of each of the slide rails is parallel to the central axis of the housing, and it is attached to the inner wall of the housing and fixedly connected to the inner wall of the housing.

[0010] The support platform is a circular plate placed on the support plate. The support platform is provided with multiple first through holes, which are arranged circumferentially around the central axis of the support platform. The support platform is also provided with multiple second through holes, which are arranged circumferentially around the central axis of the support platform.

[0011] The adjustment platform is a circular plate with right-angle connectors. The adjustment platform is slidably connected to the slide rail through the right-angle connectors. The adjustment platform has multiple third through holes arranged circumferentially around the central axis of the adjustment platform. The adjustment platform also has multiple fourth through holes arranged circumferentially around the central axis of the adjustment platform.

[0012] The main platform is housed within the inner cavity, and the main platform is provided with multiple fifth through holes;

[0013] A vertical spring is used to fix the main platform to the adjustment platform.

[0014] The first through hole, the third through hole, and the fifth through hole are located on a straight line parallel to the central axis of the housing;

[0015] The second through hole and the fourth through hole are located on another straight line parallel to the central axis of the housing;

[0016] The secondary platform is housed within the cavity of the housing;

[0017] A vertical connecting rod is provided, which is housed in the second through hole and the fourth through hole, and the sub-platform is fixedly connected to the main platform through the vertical connecting rod;

[0018] The platform is located outside the housing;

[0019] An Euler pressure bar is provided, which is housed in the first through hole, the third through hole, and the fifth through hole. The platform is fixedly connected to the sub-platform through the Euler pressure bar.

[0020] Multiple horizontal adjustment mechanisms, each of which is connected to the main platform;

[0021] A vertical adjustment mechanism is located between the adjustment platform and the support platform.

[0022] This application relates to a six-degree-of-freedom passive vibration isolator. Spatial six-degree-of-freedom disturbances include translation along the X, Y, and Z axes, and rotation around the X, Y, and Z axes. A sliding joint and a ball-and-pin joint are added at the center of the main platform to ensure that the main platform has only three degrees of freedom: translation along the Z-axis and rotation around the X and Y axes. Simultaneously, an equal-length Euler compression bar ensures that the platform has only three degrees of freedom relative to the main platform: translation along the X and Y axes and rotation around the Z-axis. Vibration disturbances from the base are transmitted to the main platform via a quasi-zero stiffness compression spring structure consisting of multiple vertical springs between the main platform and the adjustment platform, and multiple horizontal adjustment mechanisms between the main platform and the housing, isolating and suppressing disturbances in the Z-axis linear direction and rotation around the X and Y axes. The main platform is rigidly connected to the sub-platform via rigid vertical connecting rods, and its motion is consistent with that of the main platform. Vibration disturbances reaching the sub-platform are transmitted to the platform via the Euler compression bar structure, which isolates vibrations in the X and Y-axis linear directions and rotation around the Z-axis. Finally, the platform is rigidly connected to the load. After two stages of suppression, the vibration interference is ultimately transmitted to the load. Each stage of the vibration isolation system isolates vibration interference in three directions, achieving a six-degree-of-freedom (DOF) vibration isolation effect, enabling the six-DOF passive vibration isolator to adapt to complex vibration interference environments. Under vibration excitation on a standard vertical platform, horizontal platform, corner platform, and pendulum platform, the acceleration transmissibility frequency response characteristics of each single degree of freedom vibration of the six-DOF passive vibration isolator were observed. The natural frequencies of the isolator in the horizontal, vertical, pendulum, and torsional directions are all less than 2.5 Hz, proving the vibration isolation effect of this six-DOF passive vibration isolator. Attached Figure Description

[0023] Figure 1 This is a half-sectional view of a six-degree-of-freedom passive vibration isolator provided in an embodiment of this application.

[0024] Figure 2 This is an enlarged view of part A provided in an embodiment of this application.

[0025] Figure 3 This is a structural diagram of a six-degree-of-freedom passive vibration isolator with the housing hidden, provided as an embodiment of this application.

[0026] Figure 4 This is a structural diagram of a six-degree-of-freedom passive vibration isolator with the housing hidden, provided as an embodiment of this application.

[0027] Figure 5 This is a cross-sectional view of the connection between the housing and the base plate of a six-degree-of-freedom passive vibration isolator provided in an embodiment of this application.

[0028] Figure label:

[0029] 100 - Housing; 110 - Top surface; 120 - Bottom surface; 130 - Slide rail; 131 - Slider;

[0030] 140 - Support plate; 150 - Threaded through hole; 160 - Eighth through hole; 200 - Support platform;

[0031] 210 - First through hole; 220 - Second through hole; 230 - Seventh through hole; 300 - Adjustment platform;

[0032] 310 - Right-angle connector; 320 - Third through hole; 330 - Fourth through hole; 340 - Sixth through hole;

[0033] 400 - Main platform; 410 - Vertical spring; 420 - Fifth through hole; 500 - Secondary platform; 510 - Vertical connecting rod;

[0034] 600 - Tabletop; 610 - Euler pressure bar; 700 - Horizontal adjustment mechanism; 710 - First rotating joint connector;

[0035] 711 - First rotating shaft; 720 - Second rotating pair connector; 721 - Second rotating shaft;

[0036] 730 - Horizontal damping spring; 731 - Outer guide cylinder; 731a - Third rotating pair connector; 732 - Inner guide cylinder;

[0037] 732a - Fourth rotating joint connector; 733 - Horizontal spring; 740 - Horizontal knob; 750 - Fastening nut;

[0038] 800 - Vertical adjustment mechanism; 810 - Worm gear; 820 - Feed screw; 830 - Linear bearing;

[0039] 840 - Shaft seat; 850 - Worm gear; 860 - Knob; 861 - Locking screw; 870 - Coupling;

[0040] 880 - Ball pin pair; 881 - Moving pair; 900 - Base plate; 910 - Ninth through hole. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0042] This application provides a six-degree-of-freedom passive vibration isolator.

[0043] like Figure 1 As shown in one embodiment of this application, a six-degree-of-freedom passive vibration isolator includes: a housing 100, a support platform 200, an adjustment platform 300, a main platform 400, a secondary platform 500, a table 600, multiple horizontal adjustment mechanisms 700, and a vertical adjustment mechanism 800.

[0044] The housing 100 is configured to be open at the top, closed at the bottom, and have an inner cavity. The housing 100 includes a base plate 900. Multiple slide rails 130 are provided on the inner wall of the housing 100 near the top surface 110 of the housing 100. A support plate 140 is fixedly connected to the inner wall of the housing 100 near the bottom surface 120 of the housing 100. The support plate 140 is parallel to the base plate 900.

[0045] Each of the slide rails 130 extends parallel to the central axis of the housing 100 and is attached to and fixedly connected to the inner wall of the housing 100.

[0046] The support platform 200 is a circular plate placed on the support plate 140. The support platform 200 is provided with a plurality of first through holes 210, which are arranged circumferentially around the central axis of the support platform 200. The support platform 200 is provided with a plurality of second through holes 220, which are arranged circumferentially around the central axis of the support platform 200.

[0047] The adjustment platform 300 is a circular plate with a right-angle connector 310. The adjustment platform 300 is slidably connected to the slide rail 130 through the right-angle connector 310. The adjustment platform 300 has multiple third through holes 320, which are arranged circumferentially around the central axis of the adjustment platform 300. The adjustment platform 300 also has multiple fourth through holes 330, which are arranged circumferentially around the central axis of the adjustment platform 300.

[0048] The main platform 400 is housed within the cavity of the housing 100, and the main platform 400 is provided with a plurality of fifth through holes 420.

[0049] A vertical spring 410 is fixedly connected to the adjustment platform 300.

[0050] The first through hole 210, the third through hole 320 and the fifth through hole 420 are located on a straight line parallel to the central axis of the housing 100.

[0051] The second through hole 220 and the fourth through hole 330 are located on another straight line parallel to the central axis of the housing 100.

[0052] The sub-platform 500 is housed within the cavity of the housing 100.

[0053] A vertical connecting rod 510 is housed in the second through hole 220 and the fourth through hole 330. The sub-platform 500 is fixedly connected to the main platform 400 through the vertical connecting rod 510.

[0054] The platform 600 is located outside the housing 100.

[0055] Euler pressure bar 610 is housed in the first through hole 210, the third through hole 320 and the fifth through hole 420. The platform 600 is fixedly connected to the sub-platform 500 through the Euler pressure bar 610.

[0056] Multiple horizontal adjustment mechanisms 700, each of which is connected to the main platform 400.

[0057] The vertical adjustment mechanism 800 is located between the adjustment platform 300 and the support platform 200.

[0058] Specifically, the housing 100 can be a hollow cylinder with an open top, a closed bottom, and an internal cavity.

[0059] The six-degree-of-freedom spatial disturbance includes translation along the X, Y, and Z axes, and rotation around the X, Y, and Z axes. A sliding joint 881 and a ball-pin joint 880 are added at the center of the main platform 400 to ensure that the main platform 400 has only three degrees of freedom: translation along the Z-axis and rotation around the X and Y axes. Simultaneously, an equal-length Euler compression bar 610 ensures that the table surface 600, relative to the main platform 400, has only three degrees of freedom: translation along the X and Y axes and rotation around the Z-axis. Vibration interference from the base plate 900 is transmitted to the main platform 400 via a compression spring quasi-zero stiffness structure consisting of multiple vertical springs 410 between the main platform 400 and the adjustment platform 300, and multiple horizontal adjustment mechanisms 700 between the main platform 400 and the housing 100. This isolates and suppresses interference in the Z-axis linear direction and rotational directions around the X and Y axes. The main platform 400 is fixedly connected to the secondary platform 500 via a rigid vertical connecting rod 510, and its movement is consistent with that of the main platform 400. Vibration interference reaching the secondary platform 500 is transmitted to the platform 600 via an Euler compression rod 610. The Euler compression rod 610 isolates vibrations in the X and Y-axis linear directions and rotational directions around the Z-axis. Finally, the platform 600 is fixedly connected to the load. After two stages of suppression, the vibration interference is finally transmitted to the load. Each stage of the vibration isolation system isolates vibration interference in three directions of space, achieving a six-degree-of-freedom vibration isolation effect, enabling the six-degree-of-freedom passive vibration isolator to adapt to complex vibration interference environments.

[0060] The six-degree-of-freedom passive vibration isolator disclosed in this application achieves spatial six-degree-of-freedom vibration isolation, enabling it to adapt to complex vibration interference environments. Furthermore, under vibration excitation on a standard vertical platform, horizontal platform, corner platform, and pendulum platform, the acceleration transmissibility frequency response characteristics of each single degree of freedom vibration of the six-degree-of-freedom passive vibration isolator were observed. The natural frequencies of the isolator in the horizontal, vertical, pendulum, and torsional directions are all less than 2.5Hz, demonstrating the vibration isolation effect of this six-degree-of-freedom passive vibration isolator.

[0061] like Figure 2As shown in one embodiment of this application, each of the horizontal adjustment mechanisms 700 includes a first rotary joint connector 710, a second rotary joint connector 720, and a horizontal damping spring 730.

[0062] One end of the first rotating joint connector 710 abuts against the inner wall of the housing 100, and the other end of the first rotating joint connector 710 is provided with a first rotating shaft 711, the central axis of the first rotating shaft 711 being parallel to the support platform 200.

[0063] One end of the second rotating joint connector 720 abuts against the main platform 400, and the other end of the second rotating joint connector 720 is provided with a second rotating shaft 721, the central axis of the second rotating shaft 721 being parallel to the support platform 200.

[0064] The two ends of the horizontal damping spring 730 are respectively hinged to the first rotating shaft 711 and the second rotating shaft 721.

[0065] Specifically, the main platform 400 and the housing 100 are connected by a first rotary joint connector 710, a second rotary joint connector 720, and a horizontal damping spring 730. Since the first rotary joint connector 710 is equipped with a first rotating shaft 711, and the second rotary joint connector 720 is equipped with a second rotating shaft 721, when the main platform 400 is subjected to vibrations in the rotational directions around the X-axis and Y-axis, the first rotating shaft 711 and the second rotating shaft 721 can provide torque fulcrums for the main platform 400 in these directions. This achieves vibration isolation in the rotational directions around the X-axis and Y-axis.

[0066] The horizontal adjustment mechanism 700 involved in this application utilizes the first rotating shaft 711 of the first rotating pair connector 710 and the second rotating shaft 721 of the second rotating pair connector 720 as the fulcrum for providing torque to the main platform 400 in the rotation directions around the X-axis and around the Y-axis, thereby achieving vibration isolation in the rotation directions around the X-axis and around the Y-axis.

[0067] like Figure 2 As shown, in one embodiment of this application, the horizontal damping spring 730 includes an outer guide cylinder 731, an inner guide cylinder 732, and a horizontal spring 733.

[0068] The outer guide cylinder 731 is a hollow cylinder. One end of the outer guide cylinder 731 is provided with a third rotating pair connector 731a, which is hinged to the first rotating shaft 711. The other end of the outer guide cylinder 731 is slidably sleeved with the inner guide cylinder 732.

[0069] The inner guide cylinder 732 is a hollow cylinder, and one end of the inner guide cylinder 732 is provided with a fourth rotating pair connector 732a, which is hinged to the second rotating shaft 721.

[0070] The horizontal spring 733 is housed in the cylindrical cavity of the outer guide cylinder 731 and the inner guide cylinder 732. One end of the horizontal spring 733 abuts against the third rotating joint connector 731a in the inner cavity of the outer guide cylinder 731, and the other end of the horizontal spring 733 abuts against the fourth rotating joint connector 732a in the inner cavity of the inner guide cylinder 732.

[0071] Specifically, the outer guide cylinder 731 and the inner guide cylinder 732 are nested together. Because the contact surfaces between the outer guide cylinder 731 and the inner guide cylinder 732 are smooth, they can rotate around the X-axis and the Y-axis. More specifically, they can rotate around their central axis. It is worth mentioning that the third rotary joint connector 731a is hinged to the first rotating shaft 711, and the fourth rotary joint connector 732a is hinged to the second rotating shaft 721. These components isolate vibrations during rotation around the X-axis and the Y-axis.

[0072] The horizontal damping spring 730 involved in this application primarily functions to provide negative stiffness force and torque in the rotational directions around the X and Y axes, adjust the compression of the horizontal spring 733, and constrain the degrees of freedom of the main platform 400. The third rotary joint connector 731a is fixedly connected to the outer guide cylinder 731, and the fourth rotary joint connector 732a is fixedly connected to the inner guide cylinder 732. The inner and outer guide cylinders form a cylindrical sleeve pair through a clearance fit, providing rotational freedom around the X and Y axes. This enables vibration isolation of the main platform 400 in the rotational directions around the X and Y axes.

[0073] like Figure 2 As shown, in one embodiment of this application, each of the leveling mechanisms 700 further includes a leveling knob 740 and a fastening nut 750.

[0074] The housing 100 has multiple threaded through holes 150 on its column wall.

[0075] The screw of the horizontal knob 740 is housed in the threaded through hole 150. One end of the screw of the horizontal knob 740 is inside the housing 100 and is fixedly connected to the first rotating pair connector 710. The other end of the screw of the horizontal knob 740 is outside the housing 100.

[0076] The fastening nut 750 is sleeved on the screw of the horizontal knob 740 at a predetermined position outside the housing 100 and fits against the outer wall of the housing 100.

[0077] Specifically, the horizontal adjustment mechanism 700 faces complex vibrations during operation, and the threaded connection between the horizontal knob 740 and the threaded through hole 150 is susceptible to vibration. Without the fastening nut 750, the horizontal knob 740 will rotate around the central axis of the threaded through hole 150 under vibration, especially under the force of the horizontal spring 733, causing the horizontal knob 740 to move axially away from the main platform 400. However, when the horizontal knob 740 moves axially away from the main platform 400, the horizontal spring 733 cannot constrain the degree of freedom of the main platform 400, resulting in weakened vibration isolation capabilities around the X and Y axes. Therefore, the fastening nut 750 needs to be fitted onto the screw of the horizontal knob 740 at a predetermined position outside the housing 100 and in contact with the outer wall of the housing 100. This allows the fastening nut 750 to lock the horizontal knob 740 using friction.

[0078] When the main platform 400 is in a near-zero stiffness position, the horizontal knob 740 of this application controls the first rotary joint connector 710 to move forward or backward, adjusting the compression or extension of the horizontal spring 733, thereby adjusting the stiffness of the main platform 400 around the X-axis and around the Y-axis, solving the problem of the inability to adjust multi-degree-of-freedom parameters. Simultaneously, the fastening nut 750 uses friction to lock the horizontal knob 740, preventing it from moving away from the main platform 400 axially.

[0079] like Figure 3 As shown, in one embodiment of this application, the vertical adjustment mechanism 800 includes a worm gear 810, a feed screw 820, and a linear bearing 830.

[0080] The adjustment platform 300 has a sixth through hole 340 at its center.

[0081] The support platform 200 has a seventh through hole 230 at its center.

[0082] The worm gear 810 is rotatably sleeved on the seventh through hole 230.

[0083] The linear bearing 830 is fitted into the sixth through hole 340.

[0084] One end of the feed screw 820 is fixed to the worm gear center 810, and the other end of the feed screw 820 is sleeved on the linear bearing 830.

[0085] Specifically, the linear bearing 830 is fitted into the sixth through hole 340, and the worm gear 810 is rotatably sleeved in the seventh through hole 230. When the worm gear 810 rotates, one end of the feed screw 820 is fixed to the center of the worm gear 810, and the worm gear 810 drives the feed screw to rotate 820. The other end of the feed screw 820 is sleeved in the linear bearing 830. The rotating feed screw 820 causes the linear bearing 830 to drive the adjustment platform 30 to move along the central axis of the housing 100, thereby changing the compression of the vertical spring 410.

[0086] The worm gear 810, feed screw 820, and linear bearing 830 involved in this application cause the adjustment platform 300 to move along the central axis of the housing 100, changing the compression of the vertical spring 410, thereby constraining the vertical degree of freedom of the main platform 400. When the main platform 400 is working, the platform 600 is subjected to the weight of the load, and the platform 600 will transfer the weight of the load to the main platform 400. Therefore, before vibration isolation begins, the position of the adjustment platform 300 needs to be changed by the worm gear 810, feed screw 820, and linear bearing 830 to change the compression of the vertical spring 410, thereby achieving a near-zero stiffness position for the main platform 400, which can adapt to loads of different masses and solves the problem of the inability to adjust multi-degree-of-freedom parameters. It is worth mentioning that whether the main platform 400 is in a near-zero stiffness position directly affects the vibration isolation effect in all directions.

[0087] like Figure 3 As shown, in one embodiment of this application, the vertical adjustment mechanism 800 further includes a pair of bearing seats 840 and a worm gear 850.

[0088] The bearing seat 840 is fixed to the support platform 200.

[0089] The worm 850 has smooth ends and is rotatably sleeved on a pair of bearings 840. The worm 850 meshes with the worm wheel 810.

[0090] Specifically, the smooth ends of the worm 850 ensure that there is no axial movement of the worm 850 on the bearing 840. The worm 850 meshes with the worm wheel 840. When the worm 850 rotates, it drives the worm wheel 810 to rotate. The dimensions of the housing 100 determine the envelope volume of the six-degree-of-freedom passive vibration isolator. Therefore, in order to maximize the use of the space in the housing 100, the support platform 200, the adjustment platform 300, and the main platform 400 all move in the vertical direction. The worm 850, rotating about the horizontal axis, drives the worm wheel 810, which rotates about the vertical direction, causing the support platform 200, the adjustment platform 300, and the main platform 400 to move in the vertical direction.

[0091] The bearing 840 and worm gear 850 involved in this application solve the problem of the inability to adjust multi-degree-of-freedom parameters, and maximize the use of the space in the housing 100, reducing the size and weight of the six-degree-of-freedom passive vibration isolator system. This solves the problem of existing six-degree-of-freedom passive vibration isolators being large and lacking flexibility.

[0092] like Figure 4 As shown, in one embodiment of this application, the vertical adjustment mechanism 800 further includes a knob 860 and a coupling 870.

[0093] The housing 100 is provided with an eighth through hole 160.

[0094] The preset portion of the knob 860 is housed in the eighth through hole 160. One end of the knob 860 is inside the housing 100 and is flexibly connected to one end of the worm gear 850 through the coupling 870. The other end of the knob 860 is located outside the housing 100 and is provided with a locking screw 861.

[0095] Specifically, when the main platform 400 is not in the near-zero stiffness position, rotating the knob 860 causes the worm gear 850 to rotate via the coupling 870, which in turn drives the worm wheel 810 to rotate, thereby driving the feed screw 820 to rotate. This causes the adjusting platform 300 to move vertically up and down, thus adjusting the main platform 400 to the near-zero stiffness position. Once the main platform 400 is adjusted to the near-zero stiffness position, the locking screw 861 locks the worm gear 850, preventing it from rotating around the horizontal axis.

[0096] The knob 860 involved in this application provides a device for adjusting the vertical degree of freedom of a six-degree-of-freedom passive vibration isolator. Part of the knob 860 is located outside the housing 100, which facilitates the operator to directly adjust the position of the main platform 400 of the six-degree-of-freedom passive vibration isolator. At the same time, a coupling 870 is used between the knob 860 and the worm gear 850 to reduce the error during equipment installation.

[0097] like Figure 5 As shown, in one embodiment of this application, the support plate 140 is an annular plate, the outer edge of the support plate 140 is fixedly connected to the inner wall of the housing 100, and the central axis of the inner edge of the support plate 140 coincides with the central axis of the housing 100.

[0098] Specifically, the support plate 140 is used to place the support platform 200. It is an annular plate with a circular hole in the center. This circular hole facilitates the installation of the worm gear 810 on the support platform 200 and also accommodates the extension of the worm gear 810.

[0099] The support plate 140 involved in this application provides a mounting point for the support platform 200, which facilitates the mounting of the worm gear 810 on the support platform 200 and accommodates the extension of the worm gear 810. This ensures that the support platform 200 can perform its load-bearing function, and more importantly, it couples the vibration between the support platform 200 and the housing 100.

[0100] like Figure 1 As shown, in one embodiment of this application, one right-angled side of the right-angled connector 310 is fixedly connected to the adjustment platform 300, and the other right-angled side of the right-angled connector 310 is fixedly connected to a slider 131, which is slidably sleeved on the slide rail 130.

[0101] Specifically, the adjustment platform 300 is connected to the slider 131 and the slide rail 130 via multiple right-angle connectors 310, and the slide rail 130 is fixedly connected to the housing 100. The right-angle connectors 310 enable the adjustment platform 300 to move in the vertical direction.

[0102] The right-angle connector 310 involved in this application ensures that the adjustment platform 300 moves in the vertical direction. After the right-angle connector 310 is connected to the slider 131 and the slide rail 130, it also serves to limit the movement of the adjustment platform 300.

[0103] like Figure 5 As shown, in one embodiment of this application, a ninth through hole 910 is provided at the center of the base plate 900, and the ninth through hole 910 is used to install a six-degree-of-freedom passive vibration isolator on the vibration source.

[0104] Specifically, the second end 120 of the housing 100 is connected to the vibration source, and the base plate 900 is provided with a ninth through hole 910, which is used by the operator to reach into the housing 100 to install the various mounting nuts on the support platform 200. It also serves as a mounting hole to provide installation space for components mounted on the sub-platform 500 and avoid assembly problems. At the same time, the ninth through hole 910 is also adapted to the mechanical structure of the vibration source.

[0105] The base plate 900 involved in this application primarily serves to connect the vibration source, facilitating the operator's installation of the various mounting nuts on the support platform 200. More importantly, during the commissioning of the six-degree-of-freedom passive vibration isolator, a center-of-gravity compensation block can be placed on the sub-platform 500 through the ninth through hole 910 on the base plate 900. The center-of-gravity compensation block can adjust the overall center-of-gravity position when a load is placed on the platform 600 of the six-degree-of-freedom passive vibration isolator, ensuring that the overall center-of-gravity position meets the requirement of a near-zero stiffness position.

[0106] The technical features of the above embodiments can be combined arbitrarily, and the execution order of the method steps is not restricted. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A six-degree-of-freedom passive vibration isolator, characterized in that, include: The housing is configured to be open at the top, closed at the bottom, and have an inner cavity. The housing includes a bottom plate, and multiple slide rails are provided on the inner wall of the housing near the top surface of the housing. A support plate is fixedly connected to the inner wall of the housing near the bottom surface of the housing. The support plate is parallel to the bottom plate. The extension direction of each of the slide rails is parallel to the central axis of the housing, and it is attached to the inner wall of the housing and fixedly connected to the inner wall of the housing. The support platform is a circular plate placed on the support plate. The support platform is provided with multiple first through holes, which are arranged circumferentially around the central axis of the support platform. The support platform is also provided with multiple second through holes, which are arranged circumferentially around the central axis of the support platform. The adjustment platform is a circular plate with right-angle connectors. The adjustment platform is slidably connected to the slide rail through the right-angle connectors. The adjustment platform has multiple third through holes arranged circumferentially around the central axis of the adjustment platform. The adjustment platform also has multiple fourth through holes arranged circumferentially around the central axis of the adjustment platform. The main platform is housed within the inner cavity, and the main platform is provided with multiple fifth through holes; A vertical spring is used to fix the main platform to the adjustment platform. The first through hole, the third through hole, and the fifth through hole are located on a straight line parallel to the central axis of the housing; The second through hole and the fourth through hole are located on another straight line parallel to the central axis of the housing; The secondary platform is housed within the cavity of the housing; A vertical connecting rod is provided, which is housed in the second through hole and the fourth through hole, and the sub-platform is fixedly connected to the main platform through the vertical connecting rod; The platform is located outside the housing; An Euler pressure bar is provided, which is housed in the first through hole, the third through hole, and the fifth through hole. The platform is fixedly connected to the sub-platform through the Euler pressure bar. Multiple horizontal adjustment mechanisms, each of which is connected to the main platform; A vertical adjustment mechanism is located between the adjustment platform and the support platform.

2. The six-degree-of-freedom passive vibration isolator according to claim 1, characterized in that, Each of the aforementioned horizontal adjustment mechanisms includes a first rotary joint connector, a second rotary joint connector, and a horizontal damping spring; One end of the first rotating joint connector abuts against the inner wall of the housing, and the other end of the first rotating joint connector is provided with a first rotating shaft, the central axis of the first rotating shaft being parallel to the support platform; One end of the second rotary joint connector abuts against the main platform, and the other end of the second rotary joint connector is provided with a second rotating shaft, the central axis of the second rotating shaft being parallel to the support platform; The two ends of the horizontal damping spring are respectively hinged to the first rotating shaft and the second rotating shaft.

3. The six-degree-of-freedom passive vibration isolator according to claim 2, characterized in that, The horizontal damping spring includes an outer guide cylinder, an inner guide cylinder, and a horizontal spring; The outer guide cylinder is a hollow cylinder. One end of the outer guide cylinder is provided with a third rotating joint connector, which is hinged to the first rotating shaft. The other end of the outer guide cylinder is slidably sleeved with the inner guide cylinder. The inner guide cylinder is a hollow cylinder, and one end of the inner guide cylinder is provided with a fourth rotating pair connector, which is hinged to the second rotating shaft. The horizontal spring is housed in the cylindrical cavity of the outer guide cylinder and the inner guide cylinder. One end of the horizontal spring abuts against the third rotating joint connector in the inner cavity of the outer guide cylinder, and the other end of the horizontal spring abuts against the fourth rotating joint connector in the inner cavity of the inner guide cylinder.

4. The six-degree-of-freedom passive vibration isolator according to claim 3, characterized in that, Each of the aforementioned leveling mechanisms also includes a leveling knob and a fastening nut; The housing has multiple threaded through holes on its inner wall; The horizontal knob includes a screw part and a knob part. One end of the screw part extends through a threaded through hole into the inner cavity of the housing and is fixedly connected to the first rotating pair connector. The other end of the screw part is located outside the housing and is fixedly connected to the knob part. The fastening nut is sleeved on the outside of the screw section and fits against the outer wall of the housing.

5. The six-degree-of-freedom passive vibration isolator according to claim 1, characterized in that, The vertical adjustment mechanism includes a worm gear, a feed screw, and a linear bearing; The adjustment platform has a sixth through hole at its center; The support platform has a seventh through hole at its center; The worm gear is rotatably disposed within the seventh through hole; The linear bearing is fitted into the sixth through hole; One end of the feed screw is fixed to the center of the worm gear, and the other end of the feed screw is sleeved on the linear bearing.

6. The six-degree-of-freedom passive vibration isolator according to claim 5, characterized in that, The vertical adjustment mechanism also includes a pair of bearings and a worm gear; The bearing seat is fixed to the support platform; The two ends of the worm are rotatably sleeved on a pair of the aforementioned bearings, and the worm meshes with the worm wheel.

7. The six-degree-of-freedom passive vibration isolator according to claim 6, characterized in that, The vertical adjustment mechanism also includes a knob and a coupling; The housing is provided with an eighth through hole; The preset portion of the knob is housed in the eighth through hole. One end of the knob is inside the housing and is flexibly connected to one end of the worm gear through the coupling. The other end of the knob is located outside the housing and is provided with a locking screw.

8. The six-degree-of-freedom passive vibration isolator according to claim 1, characterized in that, The support plate is an annular plate, and the outer edge of the support plate is fixedly connected to the inner wall of the shell. The central axis of the inner edge of the support plate coincides with the central axis of the shell.

9. The six-degree-of-freedom passive vibration isolator according to claim 1, characterized in that, One right-angled side of the right-angled connector is fixedly connected to the adjustment platform, and the other right-angled side of the right-angled connector is fixedly connected to a slider, which is slidably sleeved on the slide rail.

10. The six-degree-of-freedom passive vibration isolator according to claim 1, characterized in that, The base plate has a ninth through hole at its center, which is used to install a six-degree-of-freedom passive vibration isolator on the vibration source.

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