A movable platform assembly
Patent Information
- Application Number
- CN202611313285.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-27
- Publication Date
- 2026-10-27
AI Technical Summary
[0002]目前市场上的移动旋转平台装置大多采用直线运动机构和旋转机构分体叠加的方式，即在直线运动机构上安装一个独立的旋转机构，虽然这种技术已经很成熟了，但是还是存在弊端，分体叠加式的结构导致存在高度空间较大占用，现代精密装备对工作面高度有严苛限制，叠加式的结构难以满足高度要求；此外，为了实现工作台的移动，直线运动机构必须承载旋转机构及其上的工件一起运动，导致直线运动机构负载较大；且直线运动机构和旋转机构之间存在基准误差，导致工作台的运动误差叠加，影响移动旋转平台装置的精度
当两个直线驱动机构同时同速同向运动时，直线驱动机构的移动端驱动平台沿第二方向运动，实现平台的直线运动；当两个直线驱动机构同时同速异向运动时，两个直线驱动机构的移动端沿第二方向异向运动，驱动平台原位转动；当两个直线驱动机构同时不同速运动时，直线驱动机构的移动端驱动平台沿第二方向运动，平台的直线运动和转动同步运行。通过两个间隔设置的直线驱动机构驱动平台沿第二方向移动或者转动，无需旋转机构，避免活动平台总成为叠加式的结构，降低活动平台总成的整体高度；此外，平台可转动地连接于导向机构的移动端，导向机构连接于底座，即导向机构支撑平台以及平台上工件，降低直线驱动机构的负载，保证直线驱动机构的使用寿命；此外，因减少旋转机构，即不存在直线驱动机构和旋转机构之间存在基准误差，提高活动平台总成的运动精度。此外，当直线驱动机构的输出端和平台之间存在间隙时，直线驱动机构的驱动方向发生反转，需要先走完间隙距离，输出才响应，导致活动平台总成的重复精度较低；然而直线驱动机构的移动端均设置沿第三方向延伸的固定轴，固定轴上套设有多个轴承；平台设置的限位结构包括两个平行设置的抵接面，两个抵接面位于固定轴的两侧，每个轴承至多和一个抵接面抵接，每个抵接面至少和一个轴承抵接；轴承外圈和对应的抵接面抵紧，轴承靠近对应抵接面的一侧和固定轴抵紧，无论平台如何运动，至少有一个轴承始终与对应抵接面保持紧密接触，从而减少间隙，提高平台运动时的重复精度，进而保障活动平台总成的可靠性。
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Figure CN122981484A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of activity platform technology, and more particularly to an activity platform assembly. Background Technology
[0002] Most mobile rotary platform devices on the market currently adopt a separate and superimposed approach for linear motion mechanisms and rotary mechanisms, that is, installing an independent rotary mechanism on the linear motion mechanism. Although this technology is quite mature, it still has drawbacks. The separate and superimposed structure results in a large occupation of height space. Modern precision equipment has strict limitations on the height of the working surface, and the superimposed structure is difficult to meet the height requirements. In addition, in order to realize the movement of the worktable, the linear motion mechanism must carry the rotary mechanism and the workpiece on it together, resulting in a large load on the linear motion mechanism. Moreover, there is a reference error between the linear motion mechanism and the rotary mechanism, which causes the motion error of the worktable to be superimposed, affecting the accuracy of the mobile rotary platform device.
[0003] In existing technologies, there are cases where a platform is driven to move or rotate by a linear motion mechanism. Although this can solve the problems of the height of the device and the large load on the linear motion mechanism, there is a gap in the connection between the output end of the linear motion device and the platform. This results in low repeatability of the platform motion (the difference between the actual motion value and the target motion value), which cannot meet the accuracy requirements of modern precision equipment.
[0004] Therefore, there is an urgent need to provide an activity platform assembly to solve the above problems. Summary of the Invention
[0005] The purpose of this invention is to provide a movable platform assembly that drives the platform to move or rotate through two linear drive mechanisms, thereby reducing the overall height of the movable platform assembly and improving the repeatability of the platform's movement.
[0006] To achieve this objective, the present invention adopts the following technical solution: This invention provides an active platform assembly, comprising: Base; Two linear drive mechanisms are spaced apart along a first direction and connected to the base; the driving direction of both linear drive mechanisms is a second direction, and the moving end of each linear drive mechanism is provided with a fixed shaft extending along a third direction, and multiple bearings are sleeved on the fixed shaft. A guide mechanism is connected to the base and disposed between the two linear drive mechanisms, and the moving end of the guide mechanism is capable of moving along the second direction; The platform is rotatably connected to the moving end of the guide mechanism. The platform is provided with two limiting structures, which are configured one-to-one with the fixed shaft. Each limiting structure includes two parallel abutment surfaces, which are located on both sides of the corresponding fixed shaft. Each bearing abuts against at most one abutment surface, and each abutment surface abuts against at least one bearing.
[0007] As an optional solution, the limiting structure includes a first limiting block and a second limiting block, both of which are connected to the platform. The two abutting surfaces are a first abutting surface and a second abutting surface. The first abutting surface is located on the first limiting block, and the second abutting surface is located on the second limiting block. At least one of the first limiting block and the second limiting block can be adjusted to move closer to or further away from the other.
[0008] As an alternative, the first limiting block has a threaded hole, the platform has a waist-shaped hole, and the threaded fastener passes through the waist-shaped hole and is threaded to the threaded hole.
[0009] As an optional solution, the linear drive mechanism includes a drive member, a lead screw, a first sliding assembly, and a first guide rail. The lead screw extends in the second direction. The drive member is connected to the base, and the lead screw is connected to the output end of the drive member. The first sliding assembly is disposed on the lead screw, and the fixed shaft is connected to the first sliding assembly. The first guide rail is connected to the base, and the first guide rail extends in the second direction. The first sliding assembly and the first guide rail are in sliding engagement.
[0010] As an alternative, the first sliding assembly includes a nut, a first connector, and a first slider. The nut is threaded to the lead screw, and both the nut and the first slider are fixedly connected to the first connector. The first slider and the first guide rail are in sliding engagement.
[0011] As an alternative, the guiding mechanism includes a second guide rail and a second sliding component. The second guide rail is connected to the base, and the extension direction of the second guide rail is the second direction. The second sliding component and the second guide rail are in sliding engagement.
[0012] As an alternative, the guide mechanism further includes a rotating element connected between the second sliding assembly and the platform.
[0013] As an alternative, the rotating component is a crossed roller bearing.
[0014] As an alternative, the rotation angle range of the platform's rotational motion is ±45°.
[0015] As an optional configuration, the platform's rotational motion has a repeatability accuracy of ±10 arcseconds; and / or The platform has a repeatability of ±0.002mm during linear motion.
[0016] The beneficial effects of this invention are: When two linear drive mechanisms move simultaneously at the same speed and in the same direction, the moving end of the linear drive mechanism drives the platform to move along the second direction, achieving linear motion of the platform. When two linear drive mechanisms move simultaneously at the same speed but in opposite directions, the moving ends of the two linear drive mechanisms move in opposite directions along the second direction, driving the platform to rotate in place. When two linear drive mechanisms move simultaneously at different speeds, the moving end of the linear drive mechanism drives the platform to move along the second direction, and the linear motion and rotation of the platform operate synchronously. By using two spaced linear drive mechanisms to drive the platform to move or rotate along the second direction, no rotating mechanism is needed, avoiding a stacked structure for the movable platform assembly and reducing the overall height of the movable platform assembly. In addition, the platform is rotatably connected to the moving end of the guide mechanism, and the guide mechanism is connected to the base. That is, the guide mechanism supports the platform and the workpiece on the platform, reducing the load on the linear drive mechanism and ensuring its service life. Furthermore, because the rotating mechanism is reduced, there is no reference error between the linear drive mechanism and the rotating mechanism, improving the motion accuracy of the movable platform assembly. Furthermore, when there is a gap between the output end of the linear drive mechanism and the platform, the driving direction of the linear drive mechanism reverses, requiring it to travel the gap distance before responding to the output, resulting in low repeatability of the moving platform assembly. However, the moving end of the linear drive mechanism is equipped with a fixed shaft extending along a third direction, with multiple bearings mounted on the fixed shaft. The limiting structure of the platform includes two parallel abutment surfaces located on both sides of the fixed shaft. Each bearing abuts against at most one abutment surface, and each abutment surface abuts against at least one bearing. The outer ring of the bearing abuts against the corresponding abutment surface, and the side of the bearing closest to the corresponding abutment surface abuts against the fixed shaft. Regardless of how the platform moves, at least one bearing always maintains close contact with the corresponding abutment surface, thereby reducing the gap, improving the repeatability of the platform during movement, and thus ensuring the reliability of the moving platform assembly. Attached Figure Description
[0017] Figure 1 This is a first-view structural schematic diagram of the activity platform assembly provided in a specific embodiment of the present invention; Figure 2 This is a second-view structural schematic diagram of the activity platform assembly provided in a specific embodiment of the present invention; Figure 3 This is a third-view structural schematic diagram of the activity platform assembly provided in a specific embodiment of the present invention; Figure 4 yes Figure 2 Enlarged view of point A in the middle.
[0018] Figure label: 100. Base; 200. Linear drive mechanism; 210. Fixed shaft; 220. Bearing; 230. Drive component; 240. Lead screw; 250. First sliding assembly; 251. Nut; 252. First connecting component; 253. First slider; 260. First guide rail; 270. Fixed base; 280. Connecting plate; 300. Guiding mechanism; 310. Second guide rail; 320. Second sliding assembly; 321. Second slider; 322. Second connecting member; 330. Rotating member; 400, platform; 410, oblong hole; 420, groove; 500, limiting structure; 510, abutting surface; 511, first abutting surface; 512, second abutting surface; 520, first limiting block; 530, second limiting block. Detailed Implementation
[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0023] like Figures 1 to 4 As shown, this embodiment provides an active platform assembly, which includes a base 100, two linear drive mechanisms 200, a guide mechanism 300, and a platform 400. The two linear drive mechanisms 200 are spaced apart along a first direction and connected to the base 100. The driving direction of both linear drive mechanisms 200 is a second direction. The moving end of each linear drive mechanism 200 is provided with a fixed shaft 210 extending along a third direction, and multiple bearings 220 are sleeved on the fixed shaft 210. The guide mechanism 300 is connected to the base 100 and is disposed on the two linear drive mechanisms 400. Between the linear drive mechanisms 200, the moving end of the guide mechanism 300 can move along the second direction; the platform 400 is rotatably connected to the moving end of the guide mechanism 300, and the platform 400 is provided with two limiting structures 500, which are correspondingly set with the fixed shaft 210. Each limiting structure 500 includes two parallel abutment surfaces 510, which are located on both sides of the corresponding fixed shaft 210. Each bearing 220 abuts against at most one abutment surface 510, and each abutment surface 510 abuts against at least one bearing 220.
[0024] When the two linear drive mechanisms 200 move simultaneously at the same speed and in the same direction, the moving end of the linear drive mechanism 200 drives the platform 400 to move along the second direction, realizing the linear motion of the platform 400; when the two linear drive mechanisms 200 move simultaneously at the same speed but in opposite directions, the moving ends of the two linear drive mechanisms 200 move in opposite directions along the second direction, driving the platform 400 to rotate in place; when the two linear drive mechanisms 200 move simultaneously at different speeds, the moving end of the linear drive mechanism 200 drives the platform 400 to move along the second direction, and the linear motion and rotation of the platform 400 run synchronously. The platform 400 is driven to move or rotate in the second direction by two spaced linear drive mechanisms 200, eliminating the need for a rotating mechanism and avoiding a stacked structure for the movable platform assembly, thus reducing the overall height of the movable platform assembly. In addition, the platform 400 is rotatably connected to the moving end of the guide mechanism 300, which is connected to the base 100. That is, the guide mechanism 300 supports the platform 400 and the workpiece on the platform 400, reducing the load on the linear drive mechanism 200 and ensuring the service life of the linear drive mechanism 200. Furthermore, because the rotating mechanism is reduced, there is no reference error between the linear drive mechanism 200 and the rotating mechanism, thus improving the motion accuracy of the movable platform assembly. Furthermore, when there is a gap between the output end of the linear drive mechanism 200 and the platform 400, the driving direction of the linear drive mechanism 200 reverses, requiring it to travel the gap distance before responding to the output, resulting in low repeatability of the moving platform assembly. However, the moving ends of the linear drive mechanism 200 are all equipped with fixed shafts 210 extending along a third direction, and multiple bearings 220 are fitted onto each fixed shaft 210. The limiting structure 500 provided on the platform 400 includes two parallel abutment surfaces 510, with the two abutment surfaces 510 located at corresponding... On both sides of the fixed shaft 210, each bearing 220 abuts against at most one abutment surface 510, and each abutment surface 510 abuts against at least one bearing 220; the outer ring of the bearing 220 abuts against the corresponding abutment surface 510, and the side of the bearing 220 closest to the corresponding abutment surface 510 abuts against the fixed shaft 210. No matter how the platform 400 moves, at least one bearing 220 always maintains close contact with the corresponding abutment surface 510, thereby reducing the gap, improving the repeatability accuracy of the platform 400 during movement, and thus ensuring the reliability of the movable platform assembly.
[0025] In this embodiment, as Figure 4 As shown, each fixed shaft 210 is fitted with two bearings 220, and each contact surface 510 abuts against only one bearing 220. The outer ring of the bearing 220 abuts against the corresponding contact surface 510, and the side of the bearing 220 closest to the corresponding contact surface 510 abuts against the fixed shaft 210. Regardless of whether the platform 400 moves or rotates, at least one bearing 220 always maintains close contact with the corresponding contact surface 510, thereby reducing clearance, improving the repeatability accuracy of the platform 400 during movement, and thus ensuring the reliability of the movable platform assembly.
[0026] In other embodiments, the fixed shaft 210 may be fitted with other numbers of bearings 220 as needed, such as three or four, without any specific limitation.
[0027] It should be noted that the first direction, the second direction, and the third direction are perpendicular to each other. The first direction is the width direction of the activity platform assembly, the second direction is the length direction of the activity platform assembly, and the third direction is the height direction of the activity platform assembly.
[0028] Optionally, the rotation angle range of the platform 400 is ±45°. The ±45° rotation range is sufficient to cover the deflection stroke required for typical working conditions such as precision alignment and multi-angle machining, enabling the platform 400 to accurately stop at any position within ±45°, thereby adapting to the posture adjustment requirements of different workstations; at the same time, the ±45° limitation effectively avoids the risk of increased equipment space occupation and interference with surrounding components caused by excessive rotation angle.
[0029] Optionally, such as Figure 4 As shown, the limiting structure 500 includes a first limiting block 520 and a second limiting block 530. Both the first limiting block 520 and the second limiting block 530 are connected to the platform 400. The two abutting surfaces 510 are a first abutting surface 511 and a second abutting surface 512. The first abutting surface 511 is located at the first limiting block 520, and the second abutting surface 512 is located at the second limiting block 530. Either the first limiting block 520 or the second limiting block 530 can be adjusted to move closer to or further away from the other. This configuration facilitates adjustment of the relative positions of the first limiting block 520 and the second limiting block 530, ensuring that the first abutting surface 511 and the second abutting surface 512 abut against the corresponding bearings 220. This ensures that regardless of the movement of the platform 400, the bearings 220 always maintain close contact with the corresponding abutting surfaces 510, thereby reducing the gaps between the outer ring of the bearing 220 and the abutting surfaces 510, between the inner ring of the bearing 220 and the outer ring of the bearing 220, and between the inner ring of the bearing 220 and the fixed shaft 210. This improves the repeatability accuracy of the platform 400 during movement and thus ensures the reliability of the movable platform assembly.
[0030] Optionally, such as Figure 4 As shown, the platform 400 has a groove 420, which is used to avoid the bearing 220 and the fixed shaft 210, so that the bearing 220 and the fixed shaft 210 can move or rotate relative to the groove 420.
[0031] Optionally, such as Figure 4As shown, the first limiting block 520 has a threaded hole, and the platform 400 has a slotted hole 410. A threaded fastener (not shown in the attached figure) passes through the slotted hole 410 and is threaded into the threaded hole. The extension direction of the slotted hole 410 is perpendicular to the first abutment surface 511. The slotted hole 410 provides the first limiting block 520 with an adjustment stroke to move closer to or further away from the second limiting block 530. By adjusting the position of the first limiting block 520, the first abutment surface 511 and the second abutment surface 512 are respectively pressed against the corresponding bearings 220. No matter how the platform 400 moves, the bearings 220 always maintain close contact with the corresponding abutment surfaces 510, thereby reducing gaps, improving the repeatability accuracy of the platform 400 during movement, and thus ensuring the reliability of the movable platform assembly. At the same time, the threaded fastener provides a stable rigid connection after pre-tightening, ensuring that the first limiting block 520 does not shift even during the reciprocating motion of the movable platform assembly, thus balancing the convenience of adjustment and repeatability accuracy.
[0032] Optionally, the second limit block 530 can be detachably connected to the platform 400 to facilitate the replacement of the second limit block 530 and avoid wear on the contact surface 510 due to long-term friction, which would affect the motion accuracy of the platform 400.
[0033] In this embodiment, the second limiting block 530 and the platform 400 are bolted together. In other embodiments, the connection between the second limiting block 530 and the platform 400 may also be configured in other ways, which are not specifically limited here.
[0034] Optionally, the repeatability of the platform 400 during rotation is ±10 arcseconds. This range indicates that the deviation of the platform 400 when returning to the same target angle each time it is frequently started, stopped, and rotated is extremely small, making it particularly suitable for workpieces requiring high positioning and precision. This precision ensures consistent positioning at any position within a ±45° angle adjustment range. The extremely high repeatability reduces the time required for repeated fine-tuning to compensate for errors, ensuring product yield and consistency.
[0035] Optionally, the repeatability of the platform 400 during linear motion is ±0.002mm. This range indicates that when the platform 400 travels back and forth to the same target point multiple times, the deviation between the actual position and the target position is extremely small, effectively eliminating the impact of accumulated errors on the processing or measurement results. In conjunction with the guide mechanism 300, this accuracy remains stable throughout the entire linear motion and under high-speed start-stop conditions. Simultaneously, the ±0.002mm repeatability significantly reduces the time spent on repeated calibration, ensuring product yield and consistency.
[0036] Optionally, such as Figure 1 and Figure 2As shown, the linear drive mechanism 200 includes a drive member 230, a lead screw 240, a first sliding assembly 250, and a first guide rail 260. The lead screw 240 extends in a second direction. The drive member 230 is connected to the base 100, and the lead screw 240 is connected to its output end. The first sliding assembly 250 is disposed on the lead screw 240, and a fixed shaft 210 is connected to the first sliding assembly 250. The first guide rail 260 is connected to the base 100, and its extension direction is the second direction. The first sliding assembly 250 and the first guide rail 260 are in sliding engagement. The drive member 230 drives the lead screw 240 to rotate, thereby driving the first sliding assembly 250 to move in the second direction under the guidance of the first guide rail 260. With this configuration, the rotation of the lead screw 240 is converted into the movement of the first sliding component 250 along the second direction. Even the slightest rotation of the lead screw 240 can be converted into the linear motion of the first sliding component 250, thereby achieving precise rotation or movement of the platform 400. The first guide rail 260 provides excellent straightness and smoothness of movement.
[0037] Optionally, such as Figure 1 and Figure 2 As shown, the linear drive mechanism 200 also includes two fixed seats 270, both of which are connected to the base 100. The two fixed seats 270 are spaced apart along the second direction, such that the two fixed seats 270 are located at the two ends of the lead screw 240 respectively, and the ends of the lead screw 240 are rotatably connected to the corresponding fixed seats 270.
[0038] Optionally, such as Figure 1 and Figure 2 As shown, the linear drive mechanism 200 also includes a connecting plate 280, which is connected to the base 100, and the drive component 230 is connected to the connecting plate 280.
[0039] Optionally, the drive unit 230 is a servo motor.
[0040] Optionally, such as Figure 1 and Figure 2 As shown, the first sliding assembly 250 includes a nut 251, a first connecting member 252, and a first slider 253. The nut 251 is threadedly connected to the lead screw 240. Both the nut 251 and the first slider 253 are fixedly connected to the first connecting member 252. The first slider 253 and the first guide rail 260 are in sliding engagement. By connecting the nut 251 and the first slider 253 to the same first connecting member 252, the rotational motion of the lead screw 240 is transmitted to linear motion. In this configuration, the first slider 253 shares the radial force and overturning moment on the lead screw 240 and the nut 251, preventing the lead screw 240 from bending or deflecting due to force, and significantly improving the system's stiffness and vibration resistance. At the same time, the first connecting member 252, as an intermediate component, facilitates overall disassembly and assembly during maintenance, reducing debugging difficulty and maintenance costs.
[0041] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the fixed shaft 210 is connected to the first connector 252.
[0042] Optionally, such as Figure 3 As shown, the guide mechanism 300 includes a second guide rail 310 and a second sliding component 320. The second guide rail 310 is connected to the base 100, and its extension direction is a second direction. The second sliding component 320 and the second guide rail 310 are slidably engaged. This sliding engagement, through the contact between the surface of the second guide rail 310 and the second sliding component 320, ensures the straightness and stability of the platform 400's movement along the second direction, effectively suppressing pitch and yaw during translation, and ensuring precise and controllable positioning of the platform 400. The sliding engagement has better damping characteristics, effectively absorbing micro-vibrations generated by high-speed start-stop or external disturbances, and improving the anti-interference capability of the movable platform assembly. In addition, this structure is simple and compact, reducing assembly complexity and maintenance costs, and ensuring high stability and long service life of the movable platform assembly.
[0043] Optionally, such as Figure 3 As shown, two second guide rails 310 are arranged at intervals and in parallel. The sliding cooperation between the two second guide rails 310 and the second sliding component 320 greatly improves the torsional stiffness and overturning moment bearing capacity of the movable platform assembly. Even when the platform 400 rotates or is subjected to eccentric load, it can still maintain high precision, ensuring the stability and reliability of the movable platform assembly.
[0044] Optionally, such as Figure 3 As shown, the second sliding assembly 320 includes a second slider 321 and a second connector 322. Two second sliders 321 are configured, each corresponding to a second guide rail 310. The two second sliders 321 slide in engagement with the second guide rails 310, and each slider 321 is connected to the second connector 322. This sliding engagement between the two second guide rails 310 and the second sliders 321 significantly improves the torsional stiffness and overturning moment bearing capacity of the movable platform assembly. Even when the platform 400 rotates or bears an eccentric load, it maintains high precision, ensuring the stability and reliability of the movable platform assembly.
[0045] Optionally, such as Figure 3 As shown, the guide mechanism 300 also includes a rotating member 330, which is connected between the second sliding assembly 320 and the platform 400. Specifically, the rotating member 330 is connected to the second connecting member 322. Through the rotating member 330, the platform 400 is rotatably connected to the second sliding assembly 320, enabling the platform 400 to move linearly along the second sliding assembly 320 and rotate around the axis of the rotating member 330, resulting in a simple structure.
[0046] In this embodiment, the rotating component 330 is a crossed roller bearing. Because its cylindrical rollers are arranged at 90° intervals in the raceways of the inner and outer rings, it can simultaneously withstand radial loads, axial loads, and overturning moments with a relatively small cross-sectional size, exhibiting extremely high rotational rigidity and positioning accuracy. Its rolling contact method ensures uniform force distribution on the rollers, effectively reducing friction and heat generation, ensuring stability even during the high-frequency reciprocating rotation of the platform 400, and significantly improving the motion accuracy of the platform 400. Furthermore, the crossed roller bearing has a long lifespan and high reliability, reducing maintenance frequency.
[0047] In some alternative embodiments, the rotating element 330 may also be configured as a turntable or other bearing as needed, without specific limitations.
[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. An activity platform assembly, characterized in that, include: Base (100); Two linear drive mechanisms (200) are spaced apart along a first direction and connected to the base (100); the driving direction of both linear drive mechanisms (200) is a second direction, and the moving end of each linear drive mechanism (200) is provided with a fixed shaft (210) extending along a third direction, and multiple bearings (220) are sleeved on each fixed shaft (210); A guide mechanism (300) is connected to the base (100) and disposed between the two linear drive mechanisms (200). The moving end of the guide mechanism (300) is capable of moving along the second direction. Platform (400), which is rotatably connected to the moving end of the guide mechanism (300), is provided with two limiting structures (500), which are provided one-to-one with the fixed shaft (210). Each limiting structure (500) includes two parallel abutment surfaces (510), which are located on both sides of the corresponding fixed shaft (210). Each bearing (220) abuts against at most one abutment surface (510), and each abutment surface (510) abuts against at least one bearing (220).
2. The activity platform assembly according to claim 1, characterized in that, The limiting structure (500) includes a first limiting block (520) and a second limiting block (530), both of which are connected to the platform (400). The two abutting surfaces (510) include a first abutting surface (511) and a second abutting surface (512), with the first abutting surface (511) located on the first limiting block (520) and the second abutting surface (512) located on the second limiting block (530). At least one of the first limiting block (520) and the second limiting block (530) is adjustable to move closer to or further away from the other.
3. The activity platform assembly according to claim 2, characterized in that, The first limiting block (520) has a threaded hole, the platform (400) has a waist-shaped hole (410), and the threaded fastener passes through the waist-shaped hole (410) and is threaded to the threaded hole.
4. The activity platform assembly according to claim 1, characterized in that, The linear drive mechanism (200) includes a drive member (230), a lead screw (240), a first sliding component (250), and a first guide rail (260). The extension direction of the lead screw (240) is the second direction. The drive member (230) is connected to the base (100), and the lead screw (240) is connected to the output end of the drive member (230). The first sliding component (250) is disposed on the lead screw (240). The fixed shaft (210) is connected to the first sliding component (250), and the first guide rail (260) is connected to the base (100). The extension direction of the first guide rail (260) is the second direction, and the first sliding component (250) and the first guide rail (260) are in sliding engagement.
5. The activity platform assembly according to claim 4, characterized in that, The first sliding assembly (250) includes a nut (251), a first connector (252), and a first slider (253). The nut (251) is threaded to the lead screw (240). The nut (251) and the first slider (253) are both fixedly connected to the first connector (252). The first slider (253) and the first guide rail (260) are in sliding engagement.
6. The activity platform assembly according to claim 1, characterized in that, The guiding mechanism (300) includes a second guide rail (310) and a second sliding component (320). The second guide rail (310) is connected to the base (100). The extension direction of the second guide rail (310) is the second direction. The second sliding component (320) and the second guide rail (310) are slidably engaged.
7. The activity platform assembly according to claim 6, characterized in that, The guide mechanism (300) further includes a rotating member (330) connected between the second sliding assembly (320) and the platform (400).
8. The activity platform assembly according to claim 7, characterized in that, The rotating component (330) is a crossed roller bearing.
9. The activity platform assembly according to any one of claims 1-8, characterized in that, The rotation angle range of the platform (400) is ±45°.
10. The activity platform assembly according to any one of claims 1-8, characterized in that, The repeatability of the platform (400) during rotational motion is ±10 arcseconds; and / or The repeatability of the platform (400) during linear motion is ±0.002mm.