Platform bracket and high-precision marble platform

Abstract

The present invention relates to the field of mechanical engineering technology, and more specifically to a platform bracket and a high-precision marble platform, wherein the platform bracket is used to support the marble platform and includes a frame, a rigid support assembly, a movable support assembly, and a balancing support assembly. The rigid support assembly is disposed on a first side of the frame and is used to constrain the translational movement of the marble platform in the X-axis, Y-axis, and Z-axis directions; the movable support assembly is disposed on a first side of the frame and is used to constrain the translational movement of the marble platform in the Y-axis and Z-axis directions; and the balancing support assembly is disposed on a second side of the frame and is used to constrain the translational movement of the marble platform in the Z-axis direction. Thus, while providing high rigidity and precise positioning support, the platform bracket also has a thermal deformation release function, allowing the marble platform to deform freely when the temperature changes significantly, avoiding the generation of thermal stress, thereby effectively ensuring the surface accuracy of the marble platform.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical engineering, and specifically provides a platform bracket and a high-precision marble platform. Background Art

[0002] The high-precision marble platform provides a high-precision and high-stability alignment benchmark for the alignment and inspection of space camera optical systems, and is an essential and important equipment for the alignment and inspection of space camera optical systems. The high-precision marble platform usually consists of a marble platform and a platform bracket. For space optical cameras that work at room temperature, alignment is usually performed at room temperature. The marble platform is used at room temperature, and the bracket only needs to maintain the table surface accuracy under small temperature fluctuations. For space optical cameras that work at low temperatures, alignment is usually performed at low temperatures, and the marble platform also needs to be used in low temperature environments. Since marble platforms are usually manufactured at room temperature, when used in low temperature environments, the bracket needs to maintain the table surface accuracy under large temperature fluctuations.

[0003] Currently, existing platform supports mainly include rigid supports and air-floating vibration isolation supports. Rigid supports generally have three-point support. Due to the significant friction between the support points and the contact surface of the marble platform, each support point can be considered to constrain the marble platform's translational freedom within the plane. Air-floating vibration isolation supports generally have multiple-point support points, and similarly, each support point can be considered to constrain the marble platform's translational freedom within the plane.

[0004] When used in a low-temperature environment, significantly below the manufacturing temperature, the marble platform and the platform bracket exhibit a mismatch in thermal expansion coefficients. This creates significant thermal stress on the marble platform, and vice versa. However, both the rigid bracket and the air-floating vibration isolation bracket are non-kinematic supports with no thermal stress relief. This results in significant deformation of the marble platform due to overconstraint, significantly reducing the accuracy of the tabletop. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a platform bracket and a high-precision marble platform, wherein the platform bracket can provide high rigidity and precise positioning support while having a thermal deformation release function, so that when the temperature changes drastically, the marble platform can deform freely to avoid thermal stress, thereby effectively ensuring the table top accuracy of the marble platform.

[0006] The present invention provides a platform bracket, which is used to support a marble platform and specifically includes a frame, a rigid support assembly, a mobile support assembly and a balancing support assembly. The rigid support assembly is arranged on the first side of the frame, and the rigid support assembly is used to constrain the translational movement of the marble platform in the X-axis, Y-axis and Z-axis directions; the mobile support assembly is arranged on the first side of the frame, and the mobile support assembly is used to constrain the translational movement of the marble platform in the Y-axis and Z-axis directions; the balancing support assembly is arranged on the second side of the frame, and the balancing support assembly is used to constrain the translational movement of the marble platform in the Z-axis direction.

[0007] Preferably, the rigid support assembly includes a first base connected to the frame.

[0008] Preferably, the movable support assembly includes a first linear guide rail slider mechanism, the first linear guide rail slider mechanism includes a first guide rail and a first slider, the first guide rail is connected to the frame along the X-axis direction, and the first slider is slidably connected to the first guide rail.

[0009] Preferably, the balancing support assembly includes a second linear guide slider mechanism, a crossbeam and a third linear guide slider mechanism, the second linear guide slider mechanism includes a second guide rail and a second slider, the second guide rail is connected to the frame along the Y-axis direction, and the second slider is slidably connected to the second guide rail; the crossbeam is arranged above the second slider; two third linear guide slider mechanisms are arranged on both sides of the crossbeam, the third linear guide slider mechanism includes a third guide rail and a third slider, the third guide rail is connected to the crossbeam along the X-axis direction, and the third slider is slidably connected to the third guide rail.

[0010] Preferably, the balancing support assembly also includes a connecting member and a rotating shaft, the connecting member is connected to the top of the second slider; a first connecting hole is opened on the connecting member, a second connecting hole is opened on the beam, and the rotating shaft is passed through the first connecting hole and the second connecting hole so that the beam can rotate around the rotating shaft.

[0011] Preferably, upper surfaces of the first base, the first slider and the two third sliders are located in the same plane; and centers of the first base, the first slider and the two third sliders are respectively located at four vertices of a rectangle.

[0012] Preferably, the platform bracket further includes a first rubber pad, a second rubber pad and a third rubber pad, the first rubber pad is connected to the top of the first base; the second rubber pad is connected to the top of the first slider; and the third rubber pad is connected to the top of the third slider.

[0013] The present invention provides a high-precision marble platform, which specifically includes a marble platform and a platform bracket provided in the embodiment of the first aspect, wherein the marble platform is arranged above the platform bracket.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects: a platform bracket for supporting a marble platform, specifically comprising a frame, a rigid support assembly, a movable support assembly, and a balancing support assembly, wherein the rigid support assembly is disposed on a first side of the frame and is used to constrain the translational movement of the marble platform in the X-axis, Y-axis, and Z-axis directions; the movable support assembly is disposed on a first side of the frame and is used to constrain the translational movement of the marble platform in the Y-axis and Z-axis directions; and the balancing support assembly is disposed on a second side of the frame and is used to constrain the translational movement of the marble platform in the Z-axis direction. Thus, while providing high rigidity and precise positioning support, the present invention also has a thermal deformation release function, allowing the marble platform to deform freely when the temperature changes significantly, avoiding the generation of thermal stress, thereby effectively ensuring the surface accuracy of the marble platform.

[0015] Among them, by setting a first base to fix and support the marble platform, setting a first linear guide slider mechanism to release thermal deformation along the X-axis direction, setting a second linear guide slider mechanism to release thermal deformation along the Y-axis direction, and setting a third linear guide slider mechanism to release thermal deformation along the X-axis direction, it is possible to avoid the platform bracket from generating thermal stress on the marble platform and causing deformation.

[0016] Among them, by setting a crossbeam in the balancing support assembly, the balancing support assembly can be expanded from a single support point to two support points. By setting a rotating shaft, the crossbeam forms a lever mechanism, thereby stably supporting the marble platform and preventing the marble platform from being excessively deformed under the action of gravity.

[0017] Among them, by arranging the first rubber pad, the second rubber pad and the third rubber pad to directly contact the marble platform and provide support, it can be approximately considered that the first rubber pad, the second rubber pad and the third rubber pad are fixedly connected to the marble platform, thereby forming a kinematic positioning support, so that when the temperature changes drastically, the marble platform can deform freely, effectively ensuring the table top accuracy of the marble platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the Kelvin motion positioning support;

[0019] Figure 2 This is a schematic structural diagram of a platform support provided by an embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a high-precision marble platform provided by an embodiment of the present invention.

[0021] Reference numerals include:

[0022] 1 Frame, 2 Rigid support assembly, 21 First base, 22 First rubber pad, 3 Mobile support assembly, 31 First guide rail, 32 First slider, 33 Second rubber pad, 4 Balance support assembly, 411 Second guide rail, 412 Second slider, 42 Crossbeam, 431 Third guide rail, 432 Third slider, 44 Connector, 45 Rotating shaft, 46 Third rubber pad, 100 Marble platform, 200 Platform bracket. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention. Similar elements in different embodiments are labeled with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present invention are not shown or described in the specification. This is to avoid the core part of the present invention being overwhelmed by too much description. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0024] It should be noted that, unless there is a conflict, the embodiments and features of the embodiments of the present invention can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence unless otherwise specified.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The first side and the second side refer to two opposite sides of the frame 1; the directions of the X-axis, Y-axis and Z-axis are as follows: Figure 2 As shown in the annotation.

[0028] It can be understood that, ideally, the platform bracket should accurately limit the six degrees of freedom of the marble platform, namely, the translational freedom along the X-axis, Y-axis and Z-axis, and the rotational freedom centered on the X-axis, Y-axis and Z-axis, so that the marble platform is neither under-constrained nor over-constrained, thereby ensuring the surface accuracy of the marble platform.

[0029] like Figure 1 As shown, the Kelvin motion positioning support is a typical kinematic positioning support structure based on precise constraint theory. It utilizes a spherical and flat surface connection and consists of a ball-socket connection, a ball-V-groove connection, and a ball-plane connection. The Kelvin motion positioning support has good repeatability and microdynamic stability, but the contact area is point contact, the structure is not closed, the rigidity is poor, the processing cost is high, and the processing precision requirements are high. Based on the Kelvin motion positioning support, the present invention provides a platform bracket and a high-precision marble platform.

[0030] like Figure 2 As shown, according to an embodiment of the first aspect of the present invention, a platform bracket is provided for supporting a marble platform, specifically comprising a frame 1, a rigid support assembly 2, a mobile support assembly 3, and a balancing support assembly 4. The rigid support assembly 2 is fixedly mounted on a first side of the frame 1. Its function can be similar to the ball-and-socket connection of a Kelvin motion positioning support, constraining the translational motion of the marble platform in the X, Y, and Z axes. The mobile support assembly 3 is fixedly mounted on a first side of the frame 1. Its function can be similar to the ball-and-V-groove connection of a Kelvin motion positioning support, constraining the translational motion of the marble platform in the Y and Z axes. The balancing support assembly 4 is fixedly mounted on a second side of the frame 1. Its function can be similar to the ball-and-plane connection of a Kelvin motion positioning support, constraining the translational motion of the marble platform in the Z axis. This structure provides high rigidity and precise positioning support while also providing thermal deformation relief. This allows the marble platform to deform freely during significant temperature fluctuations, avoiding thermal stress and effectively ensuring the surface accuracy of the marble platform, thus meeting the requirements of low-temperature assembly and adjustment of equipment such as space optical cameras.

[0031] Specifically, the present invention expands the three-point support of the Kelvin motion positioning support to a four-point support by setting a rigid support component 2, a mobile support component 3 and a balancing support component 4, while complying with the kinematic positioning support structure, thereby achieving stable and precise restriction of the six degrees of freedom of the marble platform.

[0032] In some embodiments, the frame 1 adopts a frame 1 structure with a cubic outer contour, and the rigid support component 2, the movable support component 3 and the balancing support component 4 are installed on both sides of the frame 1 and are respectively located at the three vertices of an equilateral triangle, for stably and accurately supporting the marble platform.

[0033] like Figure 2 As shown, the rigid support assembly 2 includes a first base 21, which is connected to the frame 1 and is used to fix and support the marble platform.

[0034] like Figure 2 As shown, the mobile support assembly 3 includes a first linear guide slider mechanism, which includes a first guide rail 31 and a first slider 32. The first guide rail 31 is connected to the frame 1 along the X-axis direction, and the first slider 32 is slidably connected to the first guide rail 31, so that the first slider 32 can also move translationally along the X-axis direction when supporting the marble platform, thereby releasing the thermal deformation of the marble platform along the X-axis direction and avoiding thermal stress.

[0035] like Figure 2As shown, the balancing support assembly 4 includes a second linear guide slider mechanism, a crossbeam 42, and a third linear guide slider mechanism. The second linear guide slider mechanism includes a second guide rail 411 and a second slider 412. The second guide rail 411 is connected to the frame 1 along the Y-axis direction, and the second slider 412 is slidably connected to the second guide rail 411. This allows the balancing support assembly 4 to translate along the Y-axis while supporting the marble platform, thereby relieving thermal deformation of the marble platform along the Y-axis and avoiding thermal stress.

[0036] like Figure 2 As shown, the beam 42 is arranged above the second slider 412, and two third linear guide slider mechanisms are arranged on both sides of the beam 42. The third linear guide slider mechanism includes a third guide rail 431 and a third slider 432. The third guide rail 431 is connected to the beam 42 along the X-axis direction, and the third slider 432 is slidably connected to the third guide rail 431, so that the third slider 432 can also move translationally along the X-axis direction when supporting the marble platform, thereby releasing the thermal deformation of the marble platform along the X-axis direction and avoiding thermal stress.

[0037] That is to say, in addition to being able to translate along the X-axis on the third guide rail 431 , the third slider 432 can also translate along the Y-axis along with the entire balancing support assembly 4 .

[0038] Among them, by setting a crossbeam 42 in the balancing support assembly 4 and setting the third linear guide slider mechanism on both sides of the crossbeam 42, the single ball-plane support point in the Kelvin motion positioning support structure can be expanded to two support points distributed on both sides of the crossbeam 42, so that the platform bracket can stably support the marble platform.

[0039] like Figure 2 As shown, the balancing support assembly 4 further includes a connecting member 44 and a rotating shaft 45. The connecting member 44 is connected to the upper portion of the second slider 412. The connecting member 44 is provided with a first connecting hole, and the crossbeam 42 is provided with a second connecting hole. The rotating shaft 45 is passed through the first connecting hole and the second connecting hole, so that the crossbeam 42 can rotate around the rotating shaft 45, that is, the crossbeam 42 can rotate around the Y-axis direction.

[0040] Specifically, by setting a rotating shaft 45 in the balancing support assembly 4, the beam 42 forms a lever mechanism above the second slider 412, which is used to balance the deformation of the marble platform in the pitch direction and avoid excessive deformation of the marble platform under the action of gravity.

[0041] That is to say, by setting a crossbeam 42 in the balancing support assembly 4 and setting a third linear guide slider mechanism on both sides of the crossbeam 42, the three-point support of the Kelvin motion positioning support structure can be expanded to four-point support without over-constraining the marble platform, thereby avoiding the problem of excessive and uneven force on each support point in the three-point support structure and reducing the deformation of the marble platform under the action of gravity.

[0042] like Figure 2 As shown, the upper surfaces of the first base 21, the first slider 32, and the two third sliders 432 are located in the same plane, allowing the marble platform above the platform support to remain horizontal. The centers of the first base 21, the first slider 32, and the two third sliders 432 are located at the four vertices of the rectangle, allowing the platform support to stably support the marble platform.

[0043] like Figure 2 As shown, the platform bracket also includes a first rubber pad 22, a second rubber pad 33 and a third rubber pad 46. The first rubber pad 22 is connected to the top of the first base 21, the second rubber pad 33 is connected to the top of the first slider 32, and the third rubber pad 46 is connected to the top of the third slider 432, which is used to directly contact the marble platform and provide support.

[0044] Due to the high mass of the marble platform and the high coefficient of friction between the rubber and the marble platform, under the action of gravity, the first rubber pad 22, the second rubber pad 33, and the third rubber pad 46 can be considered to be fixedly connected to the marble platform. In other words, by providing the rigid support assembly 2, the mobile support assembly 3, and the balancing support assembly 4, and by rationally arranging the first, second, and third linear guide slider mechanisms, a kinematic positioning support can be formed for the marble platform. This allows the marble platform to deform freely during significant temperature fluctuations, avoiding thermal stress and effectively ensuring the surface accuracy of the marble platform.

[0045] like Figure 3 As shown, a high-precision marble platform according to an embodiment of the second aspect of the present invention includes a marble platform 100 and a platform bracket 200 as provided in the embodiment of the first aspect, with the marble platform 100 disposed above the platform bracket 200. This allows for high rigidity and precise positioning support while also providing thermal deformation relief. This allows the marble platform 100 to deform freely during significant temperature fluctuations, avoiding thermal stress. This effectively ensures the surface accuracy of the marble platform 100, thus meeting the requirements of low-temperature assembly and adjustment of equipment such as space optical cameras.

[0046] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0047] The above specific embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A platform bracket used to support a marble platform, characterized in that: include: Framework (1); A rigid support assembly (2), the rigid support assembly (2) being arranged on a first side of the frame (1), the rigid support assembly (2) being used to constrain the translational movement of the marble platform in the directions of the X-axis, the Y-axis and the Z-axis; the rigid support assembly (2) comprising a first base (21), the first base (21) being connected to the frame (1); A movable support assembly (3), the movable support assembly (3) being arranged on a first side of the frame (1), the movable support assembly (3) being used to constrain the translational movement of the marble platform in the Y-axis and Z-axis directions; the movable support assembly (3) comprising a first linear guide rail slider mechanism, the first linear guide rail slider mechanism comprising a first guide rail (31) and a first slider (32), the first guide rail (31) being connected to the frame (1) along the X-axis direction, the first slider (32) being slidably connected to the first guide rail (31); A balancing support assembly (4) is provided on the second side of the frame (1), and is used to constrain the translational movement of the marble platform in the Z-axis direction; the balancing support assembly (4) includes a second linear guide rail slider mechanism, and the second linear guide rail slider mechanism includes a second guide rail (411) and a second slider (412), the second guide rail (411) is connected to the frame (1) along the Y-axis direction, and the second slider (412) is slidably connected to the A second guide rail (411); a crossbeam (42), wherein the crossbeam (42) is arranged above the second slider (412); a third linear guide rail slider mechanism, wherein two third linear guide rail slider mechanisms are arranged on both sides of the crossbeam (42), and the third linear guide rail slider mechanism includes a third guide rail (431) and a third slider (432), wherein the third guide rail (431) is connected to the crossbeam (42) along the X-axis direction, and the third slider (432) is slidably connected to the third guide rail (431).

2. The platform bracket according to claim 1, characterized in that: The balance support assembly (4) further comprises: a connecting member (44), the connecting member (44) being connected above the second sliding block (412); A rotating shaft (45) is provided on the connecting member (44), a first connecting hole is provided on the crossbeam (42), and the rotating shaft (45) is passed through the first connecting hole and the second connecting hole so that the crossbeam (42) can rotate around the rotating shaft (45).

3. The platform bracket according to claim 1, characterized in that: The upper surfaces of the first base (21), the first slider (32) and the two third sliders (432) are located in the same plane; The centers of the first base (21), the first slider (32) and the two third sliders (432) are respectively located at the four vertices of a rectangle.

4. The platform bracket according to claim 1, wherein: Also includes: a first rubber pad (22), the first rubber pad (22) being connected to the upper portion of the first base (21); a second rubber pad (33), the second rubber pad (33) being connected to an upper portion of the first sliding block (32); A third rubber pad (46) is connected to the upper portion of the third sliding block (432).

5. A high-precision marble platform, characterized in that: include: Marble platform (100); And according to the platform support (200) according to any one of claims 1 to 4, the marble platform (100) is arranged above the platform support (200).

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