A composite low-frequency vibration isolation table and optical platform

Abstract

This invention provides a composite low-frequency vibration isolation table and optical platform, belonging to the field of mechanical structure vibration reduction technology. The composite low-frequency vibration isolation table includes a support base, a cosine beam, a negative stiffness element, and a transmission component. The cosine beam has a first connecting portion, a second connecting portion, and at least two cosine elements. One end of each cosine element is connected to the first connecting portion, and the other end of each cosine element is connected to the second connecting portion. The cosine element has a first curved surface. Support bases are provided at both ends of the negative stiffness element. The negative stiffness element has a second curved surface, and a fixing component is provided at the top of the second curved surface. One end of the transmission component is connected to the fixing component, and the other end of the transmission component is connected to the first connecting portion. This invention connects the cosine beam and the negative stiffness element through the transmission component, so that when the cosine beam is subjected to the vibration force of an external carrier, the vibration is transmitted to the negative stiffness element through the fixing component. The cosine elements and the negative stiffness element deform, generating a damping effect and reducing vibration, thereby widening the effective vibration suppression frequency band.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical structure vibration reduction, and in particular to a composite low-frequency vibration isolation table and an optical platform. Background Art

[0002] With the continuous progress and development of science and technology, precision instruments are widely used in various fields such as precision measurement systems, fiber optic component manufacturing, precision processing and manufacturing, and microelectronics manufacturing. Since precision instruments and equipment are disturbed by various vibrations during use, such as environmental vibrations from the ground and vibrations generated by various active devices in the building's internal environment, it is necessary to use an optical platform to isolate the precision instruments. Traditional optical platforms are limited by their own stiffness, have a large natural frequency, and have weak or even no isolation ability for low frequencies, and do not have a high level of low-frequency vibration isolation capability.

[0003] The effective vibration suppression band of the traditional tuned mass damper is narrow, so it is of great practical significance to study and design a low-frequency negative stiffness tuned mass damper for optical platforms. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a composite low-frequency vibration isolation table and an optical platform.

[0005] The present invention provides the following technical solutions: a composite low-frequency vibration isolation table, comprising a support seat, a cosine beam, a negative stiffness element and a transmission member;

[0006] The cosine beam has a first connection portion, a second connection portion and at least two cosine members;

[0007] One end of each of the cosine members is connected to the first connection portion, and the other end of each of the cosine members is connected to the second connection portion;

[0008] The cosine member has a first curved surface, and the first curved surface is protruding toward the outer side of the cosine beam;

[0009] The support seats are respectively provided at both ends of the negative stiffness element;

[0010] The negative stiffness element has a second curved surface, the second curved surface protrudes toward the cosine beam, a fixing piece is provided on the top of the second curved surface, one end of the transmission member is connected to the fixing piece, and the other end of the transmission member is connected to the first connecting portion.

[0011] In some embodiments of the present application, there are two cosine components, the two cosine components are arranged opposite to each other, and the two cosine components are centrally symmetrical about the axis of the cosine beam.

[0012] Further, the transmission member includes a mounting seat, a mass block and a cover plate;

[0013] The mass block is arranged in the mounting seat, and the cover plate is arranged at the open end of the mounting seat to limit the mass block.

[0014] Furthermore, two ends of the negative stiffness element are provided with connecting pieces respectively, and the connecting pieces are slidably connected to the support seat.

[0015] Further, the support seat includes a support plate and a support platform arranged on the support plate;

[0016] One side of the support platform is provided with an opening.

[0017] Furthermore, a slide rail is provided on one side of the support platform close to the negative stiffness element;

[0018] Two opposite sides of the connecting member are respectively provided with sliding grooves, and the negative stiffness element is slidably connected with the sliding grooves through the sliding rails.

[0019] Furthermore, a limiting structure is provided on the support seat, and the limiting structure is connected to the connecting piece.

[0020] Further, the limiting structure includes a first mounting rod and a second mounting rod;

[0021] The first mounting rod is inserted into the support platform, one end of the second mounting rod passes through the opening and is connected to the first mounting rod, and the other end of the second mounting rod is provided with a first limiting nut and a second limiting nut spaced apart from each other;

[0022] The first limiting nut and the second limiting nut are respectively located at two opposite sides of the connecting member and respectively conflict with the connecting member.

[0023] Some embodiments of the present invention provide an optical platform, including an optical platform and at least one composite low-frequency vibration isolation platform as described above;

[0024] One side of the optical table in the thickness direction is connected to the second connection portion.

[0025] Furthermore, the optical platform also includes four supporting columns;

[0026] The four support columns and the composite low-frequency vibration isolation platform are respectively located on the same side of the optical platform, and the four support columns are respectively arranged at four vertex corners of the optical platform.

[0027] The embodiment of the present invention has the following advantages: by placing the first curved surface of the cosine member toward the outside of the cosine beam, when the cosine beam is subjected to the force of external vibration, the cosine member located between the first connecting portion and the second connecting portion generates elastic deformation under the action of vibration, absorbs energy, thereby reducing the vibration amplitude and achieving the effect of vibration reduction. At the same time, the vibration acting on the cosine beam is transmitted to the negative stiffness element through the fixing member, the negative stiffness element generates deformation, and generates a damping effect at the same time, so that the mechanical energy generated by the vibration of the equipment is absorbed by the cosine beam and the negative stiffness element during the deformation process, so as to achieve the effect of vibration reduction, further reduce the vibration of the equipment, and thus make the effective vibration suppression frequency band wider.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A structural schematic diagram of a composite low-frequency vibration isolation platform provided by some embodiments of the present invention is shown from one perspective;

[0031] Figure 2 A structural schematic diagram showing a perspective of a support base in a composite low-frequency vibration isolation platform provided by some embodiments of the present invention;

[0032] Figure 3 A schematic structural diagram showing a perspective of a mass block in a composite low-frequency vibration isolation platform provided by some embodiments of the present invention;

[0033] Figure 4 A schematic structural diagram of a negative stiffness element in a composite low-frequency vibration isolation platform provided by some embodiments of the present invention is shown;

[0034] Figure 5 A schematic structural diagram of an optical platform provided by some embodiments of the present invention at a viewing angle is shown;

[0035] Figure 6 A comparison diagram of amplitude effects in an optical platform provided by some embodiments of the present invention is shown.

[0036] Description of main component symbols:

[0037] 100-support seat; 200-cosine beam; 300-negative stiffness element; 400-transmission member; 210-first connecting part; 220-second connecting part; 230-cosine member; 500-fixing member; 410-mounting seat; 420-mass block; 430-cover plate; 310-connecting member; 110-support plate; 120-support table; 121-opening; 600-limiting structure; 610-first mounting rod; 620-second mounting rod; 630-first limiting nut; 640-second limiting nut; 122-slide rail; 311-slide groove; 700-optical table; 800-support column. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] like Figure 1 and Figure 2 As shown, some embodiments of the present invention provide a composite low-frequency vibration isolation table, which is mainly used for precision detection, precision experiments, precision processing, etc., and is particularly suitable for precision instruments with specific requirements on the ground vibration environment.

[0044] By connecting the composite low-frequency vibration isolation platform provided by the present invention to a vibration device, when receiving the vibration of the device, the cosine beam 200 of the negative stiffness tuned mass damper produces elastic deformation, and the mass block 420 moves, and the vibration continues to be transmitted to the negative stiffness element 300, enters the working range of the negative stiffness element 300 and produces deformation, and the mechanical energy of the vibration is lost in this movement process, producing a damping effect, thereby achieving a vibration reduction effect.

[0045] The composite low-frequency vibration isolation platform includes a support base 100 , a cosine beam 200 , a negative stiffness element 300 and a transmission member 400 .

[0046] Specifically, the cosine beam 200 has a first connecting portion 210 , a second connecting portion 220 and at least two cosine members 230 .

[0047] It is understandable that the number of the cosine components 230 can be two or more than two, and can be set according to actual conditions.

[0048] It should be noted that any two adjacent cosine elements 230 are arranged at an interval.

[0049] In some embodiments of the present invention, there are two cosine components 230 , which are arranged opposite to each other and are centrally symmetrical about the axis of the cosine beam 200 , so as to improve the uniformity of the cosine beam 200 during the force application process, thereby improving the uniformity of vibration reduction.

[0050] In addition, one end of each of the cosine components 230 is connected to the first connection portion 210 , and the other end of each of the cosine components 230 is connected to the second connection portion 220 .

[0051] It should be noted that the first connection part 210 and the second connection part 220 are any one of a connection plate, a connection platform, and a connection block. In this embodiment, the first connection part 210 and the second connection part 220 are connection plates to improve the stability of the connection between the cosine beam 200 and the external carrier.

[0052] Specifically, the first connection portion 210 and the second connection portion 220 are arranged at intervals and parallel to each other.

[0053] It should be noted that, in some embodiments of the present invention, the cosine member 230 is a plate-like structure in the shape of a cosine curve. It is understandable that the cosine member 230 has a first curved surface, and the first curved surface is convex to the outer side of the cosine beam 200.

[0054] Specifically, when the cosine beam 200 is connected to an external carrier, when the external carrier receives vibration or impact force, the cosine member 230 located between the first connection portion 210 and the second connection portion 220 generates elastic deformation under the action of the vibration, and the first connection portion 210 and the second connection portion 220 move toward each other. It should be noted that during the elastic deformation of the cosine member 230, energy is absorbed, so that the vibration amplitude of the carrier is reduced by the cosine member 230 in the cosine beam 200, thereby achieving a vibration reduction effect.

[0055] It is understandable that when an external force acts on the cosine beam 200, the cosine member 230 generates elastic deformation. At this time, the cosine period corresponding to the cosine member 230 decreases, and the cosine member 230 has a tendency to restore the original period, thereby forming a buffering effect on the external force to achieve the purpose of vibration reduction.

[0056] In addition, the support bases 100 are respectively provided at both ends of the negative stiffness element 300 to provide support and fixation to the negative stiffness element 300 through the support bases 100, so as to improve the stability of the negative stiffness element 300 during deformation when subjected to external vibration.

[0057] It can be understood that the support base 100 is used to connect with an external carrier. For example, the support base 100 can be installed on the ground, the support base 100 can also be installed on a wall, on a track, on mechanical equipment, etc., and can be specifically set according to actual conditions.

[0058] Specifically, the negative stiffness element 300 has a second curved surface, and the second curved surface is convex toward the cosine beam 200 .

[0059] It should be noted that the second curved surface is a cosine curved surface, that is, the shape of the negative stiffness element 300 is a cosine structure. It can be understood that when an external force acts on the negative stiffness element 300, the negative stiffness element 300 undergoes elastic deformation under the action of the external force and absorbs energy at the same time. Specifically, at this time, the cosine period corresponding to the negative stiffness element 300 increases, and the negative stiffness element 300 has a tendency to restore the original period to form a buffering effect on the external force, thereby achieving the purpose of vibration reduction, so as to achieve the effect of vibration reduction by reducing the vibration amplitude through the negative stiffness element 300.

[0060] Meanwhile, a fixing member 500 is provided on the top of the second curved surface, one end of the transmission member 400 is connected to the fixing member 500 , and the other end of the transmission member 400 is connected to the first connection portion 210 or the second connection portion 220 .

[0061] It should be noted that the negative stiffness element 300 and the cosine beam 200 are connected by a fixing member 500 to further enhance the vibration reduction effect. Specifically, when the cosine beam 200 is connected to an external device and the external device vibrates, the force of the vibration is transmitted to the cosine beam 200, and the cosine beam 200 produces elastic deformation and absorbs the energy generated during the vibration of the device to reduce the vibration of the external device. At the same time, the vibration acting on the cosine beam 200 is transmitted to the negative stiffness element 300 through the fixing member 500, and the negative stiffness element 300 produces deformation and produces a damping effect at the same time, so that the mechanical energy generated by the vibration of the device is absorbed by the cosine beam 200 and the negative stiffness element 300 during the deformation process to achieve the effect of vibration reduction and further reduce the vibration of the device.

[0062] like Figure 1 and Figure 3 As shown, in some embodiments of the present invention, the transmission member 400 includes a mounting seat 410 , a mass block 420 and a cover plate 430 .

[0063] Specifically, a mounting groove is provided on the mounting seat 410, and the mass block 420 is arranged in the mounting seat 410 through the mounting groove. At the same time, the cover plate 430 is arranged at the opening 121 end of the mounting seat 410 to limit the mass block 420, so as to fix the mass block 420 in the mounting seat 410 and improve the stability of the tube mass block 420 in the mounting seat 410.

[0064] It should be noted that the connection method between the transmission member 400 and the fixing member 500 can be any one of welding, clamping, and threaded connection, which can be specifically set according to actual conditions.

[0065] In some embodiments of the present invention, in order to install or disassemble the edge transmission member 400 and the fixing member 500, the transmission member 400 and the fixing member 500 are connected by bolts to improve the stability of the connection between the transmission member 400 and the fixing member 500, and at the same time facilitate maintenance or replacement, thereby reducing the cost of use.

[0066] like Figure 1 and Figure 4 As shown, in some embodiments of the present invention, both ends of the negative stiffness element 300 have connecting members 310 , respectively, and the connecting members 310 are slidably connected to the support base 100 .

[0067] It should be noted that the sliding direction of the connecting member 310 on the support seat 100 is the same as the compression direction of the cosine beam 200 , and the compression direction of the cosine beam 200 is the same as the compression direction of the negative stiffness element 300 .

[0068] It is understandable that by slidably connecting the connector 310 to the support base 100 , the negative stiffness element 300 is slidably connected to the support base 100 , so that the height of the negative stiffness element 300 on the support base 100 can be adjusted according to actual conditions.

[0069] Specifically, two opposite sides of the connecting member 310 are provided with sliding grooves 311 , and a sliding rail 122 is provided on one side of the supporting platform 120 close to the negative stiffness element 300 . The sliding grooves 311 are slidably connected to the sliding rail 122 .

[0070] like Figure 2 As shown, in some embodiments of the present invention, the support seat 100 includes a support plate 110 and a support platform 120 disposed on the support plate 110 , wherein the support platform 120 is disposed in the middle of the support plate 110 .

[0071] In this embodiment, in order to improve the stability of the support base 100 , the support platform 120 and the support plate 110 are integrally formed to form the support base 100 .

[0072] Among them, an opening 121 is provided on one side of the support platform 120, so that the connecting member 310 is connected to the limiting structure 600 through the opening 121, so that the negative stiffness element 300 is limited by the limiting structure 600, thereby improving the stability of the connection between the negative stiffness element 300 and the support seat 100.

[0073] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, in order to improve the stability of the connection between the negative stiffness element 300 and the support base 100, a limiting structure 600 is provided on the support base 100 to form a limit with the negative stiffness element 300 through the limiting structure 600.

[0074] Specifically, the limiting structure 600 includes a first mounting rod 610 and a second mounting rod 620 .

[0075] It should be noted that, in this embodiment, the first mounting rod 610 and the second mounting rod 620 are respectively threaded rods.

[0076] In this embodiment, the first mounting rod 610 is inserted through the support platform 120, and it can be understood that the first connecting rod is rotatably connected to the support platform 120. At the same time, one end of the second mounting rod 620 is passed through the opening 121 and connected to the first mounting rod 610, wherein the axis of the first mounting rod 610 is perpendicular to the axis of the second mounting rod 620. It can be understood that the position of the second mounting rod 620 can be adjusted by rotating the first mounting rod 610.

[0077] At the same time, a first limiting nut 630 and a second limiting nut 640 are spaced apart from each other at the other end of the second mounting rod 620. It can be understood that the first limiting nut 630 and the second limiting nut 640 are respectively threadedly connected to the second mounting rod 620, that is, the positions of the first limiting nut 630 and the second limiting nut 640 on the second mounting rod 620 can be adjusted, and the distance between the first limiting nut 630 and the second limiting nut 640 can be adjusted.

[0078] It should be noted that a clearance groove is provided on the connecting member 310. Specifically, one end of the second mounting rod 620 is clamped in the clearance groove, and the first limiting nut 630 and the second limiting nut 640 are respectively located at two opposite sides of the connecting member 310, and the first limiting nut 630 and the second limiting nut 640 are rotated so that the first limiting nut 630 and the second limiting nut 640 are in conflict with the connecting member 310 to limit the connecting member 310, so that the negative stiffness element 300 is fixed on the support seat 100 through the limiting structure 600, and the stability of the negative stiffness element 300 on the support seat 100 is improved.

[0079] It is understandable that by adjusting the positions of the first limiting nut 630 and the second limiting nut 640 on the second mounting rod 620, the position between the negative stiffness element 300 and the support seat 100 can be adjusted to adapt to different installation heights, thereby improving the utilization rate of the composite low-frequency vibration isolation table.

[0080] It should be noted that the cover plate 430 , the mounting seat 410 , the negative stiffness element 300 and the support seat 100 are made of aluminum, stainless steel, plastic, resin, etc., and can be optimized according to actual installation and cost conditions.

[0081] Specifically, in this embodiment, the cover plate 430 , the mounting seat 410 , and the negative stiffness element 300 are all made of aluminum.

[0082] like Figure 1 and Figure 5 As shown, some embodiments of the present invention further provide an optical platform, which includes an optical table 700 and at least one composite low-frequency vibration isolation table as described in any one of the above embodiments.

[0083] It is understandable that the number of the composite low-frequency vibration isolation tables can be one, two, or any number above two, and can be specifically set according to actual conditions.

[0084] The composite low-frequency vibration isolation table is arranged on one side of the optical platform in the thickness direction, and one side of the optical platform 700 in the thickness direction is connected to the second connecting portion 220 to provide vibration reduction for the optical platform 700 through the composite low-frequency vibration isolation table.

[0085] In this embodiment, in order to improve the stability of the connection between the composite low-frequency vibration isolation table and the optical table 700 and facilitate installation or disassembly, the second connection part 220 is connected to the optical table 700 by bolts.

[0086] Specifically, in order to improve the stability of the optical platform, the optical platform further includes four support columns 800. The four support columns 800 and the composite low-frequency vibration isolation platform are respectively located on the same side of the optical platform 700, and the four support columns 800 are respectively arranged at the four vertex corners of the optical platform.

[0087] In this embodiment, the support base 100 and the support column 800 are respectively installed on the ground through expansion bolts to improve the stability of the optical platform.

[0088] It should be noted that due to the limitation of its own stiffness, the traditional optical platform has a large natural frequency and a weak or even no effect on low-frequency isolation, and does not have a high level of low-frequency vibration isolation capability.

[0089] Therefore, in order to further improve the vibration level of the optical platform, the present invention achieves the effect of vibration reduction by installing a composite low-frequency vibration isolation table on the optical platform. Specifically, when the optical table 700 of the optical platform is vibrating, the optical table 700 transmits the force of the vibration to the cosine beam 200, and the cosine beam 200 produces elastic deformation, while absorbing the energy generated during the vibration of the optical table 700, so as to reduce the amplitude of the optical table 700 and improve the effective vibration frequency band of the composite low-frequency vibration isolation table. Since the fixing member 500 is connected to the cosine beam 200, and the vibration acting on the cosine beam 200 is transmitted to the negative stiffness element 300 through the fixing member 500, the negative stiffness element 300 produces deformation and produces a damping effect at the same time, so that the mechanical energy generated by the vibration of the optical table 700 is absorbed by the cosine beam 200 and the negative stiffness element 300 during the deformation process, so as to reduce the vibration of the equipment, increase the vibration frequency bandwidth, and thus improve the vibration isolation effect.

[0090] It should be noted that Figure 6 is the amplitude curve of the optical platform during vibration. Specifically, Figure 6 The solid line in is the corresponding amplitude curve when no tuned mass damper is set in the optical platform. Figure 6 The short dashed line in is the corresponding amplitude curve when a traditional tuned mass damper is set in the optical platform. Figure 6 The long dashed line in is the corresponding amplitude curve when the composite low-frequency vibration isolation table provided by the present invention is provided in the optical platform. It can be clearly seen from the figure that when the vibration frequency of the optical platform is between 20Hz and 40Hz, by providing the composite low-frequency vibration isolation table provided by some embodiments of the present invention in the optical platform, the vibration amplitude of the optical platform during the vibration process is significantly reduced, the low-frequency vibration isolation capability of the optical platform is improved, and the vibration reduction effect on the optical platform is improved.

[0091] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0092] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A composite low-frequency vibration isolation table, characterized in that: It includes a support seat, a cosine beam, a negative stiffness element and a transmission part; The cosine beam has a first connection portion, a second connection portion and at least two cosine members; One end of each of the cosine members is connected to the first connection portion, and the other end of each of the cosine members is connected to the second connection portion; The cosine member has a first curved surface, and the first curved surface is protruding toward the outer side of the cosine beam; The support seats are respectively provided at both ends of the negative stiffness element; The negative stiffness element has a second curved surface, the second curved surface protrudes toward the cosine beam, a fixing piece is provided on the top of the second curved surface, one end of the transmission member is connected to the fixing piece, and the other end of the transmission member is connected to the first connecting portion; The support seat comprises a support plate and a support platform arranged on the support plate, one side of the support platform is provided with an opening, and a side of the support platform close to the negative stiffness element is provided with a slide rail; The two ends of the negative stiffness element are respectively provided with connecting pieces, and the connecting pieces are slidably connected with the supporting seat; Two opposite sides of the connecting member are respectively provided with sliding grooves, and the negative stiffness element is slidably connected with the sliding grooves through the sliding rails.

2. The composite low-frequency vibration isolation table according to claim 1, characterized in that: There are two cosine components, which are arranged opposite to each other and are centrally symmetrical about the axis of the cosine beam.

3. The composite low-frequency vibration isolation table according to claim 1, characterized in that: The transmission member comprises a mounting seat, a mass block and a cover plate; The mass block is arranged in the mounting seat, and the cover plate is arranged at the open end of the mounting seat to limit the mass block.

4. The composite low-frequency vibration isolation table according to claim 1, characterized in that: The support seat is provided with a limiting structure, and the limiting structure is connected to the connecting piece.

5. The composite low-frequency vibration isolation table according to claim 4, characterized in that: The limiting structure includes a first mounting rod and a second mounting rod; The first mounting rod is inserted into the support platform, one end of the second mounting rod passes through the opening and is connected to the first mounting rod, and the other end of the second mounting rod is provided with a first limiting nut and a second limiting nut spaced apart from each other; The first limiting nut and the second limiting nut are respectively located at two opposite sides of the connecting member and respectively conflict with the connecting member.

6. An optical platform, characterized in that: comprising an optical table and at least one composite low-frequency vibration isolation table as claimed in any one of claims 1 to 5; One side of the optical table in the thickness direction is connected to the second connection portion.

7. The optical platform according to claim 6, characterized in that: The optical platform also includes four support columns; The four support columns and the composite low-frequency vibration isolation platform are respectively located on the same side of the optical platform, and the four support columns are respectively arranged at four vertex corners of the optical platform.

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