Linear motion platform
By adopting the rotating hinged structure of the suspension rod and the connecting unit in the linear motion platform, a linear motion platform without the moving pair is realized, solving the problems of wear, lubrication difficulties and reduced motion accuracy caused by the moving pair in the prior art, and achieving efficient and stable linear motion.
Patent Information
- Application Number
- CN202510337837.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-05-30
AI Technical Summary
In the existing linear motion platform, the moving pair is affected by the large friction, severe wear, difficulty in lubrication and poor lateral force dispersion when realizing linear motion.
A linear motion platform without moving pairs is designed. Through the rotating articulation structure of the suspension rod and the connecting unit, the plane composite movement of the moving platform is realized, thereby achieving the effect of approximate linear motion.
This design achieves linear motion with simple structure, wide application range, stable and reliable movement, avoids the disadvantages of moving pairs, ensures movement accuracy, and reduces wear and energy losses.
Smart Images
Figure CN120062311A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the research and development field of mechanical motion, in particular to a linear motion platform. Background Art
[0002] Most platforms that can achieve linear motion currently contain a moving pair, which is a common kinematic pair that allows the two components that make up the kinematic pair to move relative to each other in a plane, but restricts movement in other directions. The degree of freedom of the moving pair is 1, which means that it can only achieve relative movement in one direction. As a low-level pair, the moving pair plays an important role in the mechanical system. It achieves the relative movement of two components in a plane by limiting the direction of movement, and is widely used in various machinery and daily equipment, such as pistons and cylinders, sliding doors and guide rails, etc.
[0003] The moving pair usually achieves relative movement through sliding friction. The friction is large, which can easily lead to wear and energy loss. They perform poorly when subjected to lateral forces because they can only move in one direction and cannot effectively disperse the lateral force. At the same time, the lubrication of the moving pair is more difficult, especially in high-speed movement or heavy load conditions. Insufficient lubrication can cause severe wear and damage. After long-term use, the movement accuracy will gradually decrease due to wear and deformation. The friction resistance of the moving pair is also large during startup, especially in the case of poor lubrication, which will affect the startup performance of the equipment. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a linear motion platform with a simple structure, a wide range of applications, and no moving pair. The linear motion of the motion platform is achieved under the action of a rotating pair, thus avoiding the disadvantages caused by the moving pair achieving linear motion.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: The present invention comprises a motion platform, a connection unit and a suspension rod, wherein the suspension parts are symmetrically arranged at two ends of the motion platform, one end of the connection unit is rotationally hinged to the motion platform, the other end is rotationally hinged to the suspension rod, and the other end of the suspension rod is rotationally hinged to the frame.
[0006] A further improvement of the present invention is that the connecting unit includes a first connecting member and a second connecting member, the first connecting member and the second connecting member are symmetrically arranged on both sides of the suspension member, one end of the first connecting member and the second connecting member is rotatably hinged to the suspension member, and the other end is rotatably hinged to the motion platform.
[0007] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are: The structure of the present invention is simple, with novel design, wide application range and good practicability. It does not contain any moving pairs, only rotating pairs with high load-bearing capacity and stable motion performance. When the suspension rod rotates, it drives the connecting unit to perform a planar compound motion, which is the combined motion of rotation and linear motion. Subsequently, the connecting units on both sides drive the motion platform hinged thereto to perform a planar compound motion. The aspect ratio of the planar compound motion of the motion platform is 1.2%. When the longitudinal movement is ignored, the linear motion is more obvious, while the rotational motion is not obvious, that is, the compound motion of the motion platform presents an approximate linear motion.
[0008] The present invention overcomes the drawbacks brought by the moving pair itself in the prior art for realizing linear motion, and is applicable to places where linear motion is required. It has good load-bearing capacity, smoother and more reliable motion, and ensures the motion accuracy. It can replace the linear motion realized by sliding friction or rolling friction, such as traditional mechanical guides, guide rail systems using balls or rollers, etc. The present invention opens up new ideas for the development and research of mechanical motion, points out a new research and development direction, and is of great significance and necessary to be popularized. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a schematic diagram of the working principle of the present invention; Figure 2 is a schematic diagram of the selection of the dimensions of each component in the embodiment of the present invention.
[0010] Wherein, 1. Motion platform; 1-1. Longitudinal dimension; 1-2. First transverse dimension; 1-3. Second transverse dimension; 2. Frame; 3. First connecting rod; 4. Second connecting rod; 4-1. Length dimension; 5. Suspension rod; 5-1. Height dimension; 5-2. Width dimension. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0011] The following further describes the present invention in detail with reference to the embodiments: A linear motion platform, as Figure 1 and Figure 2 shown, which includes a motion platform 1 and a suspension rod 5 rotatably hinged to the motion platform 1 through a connecting unit. The motion platform, the connecting unit and the suspension rod 5 are all made of rigid materials, having certain stiffness and strength, and are not easily elastically deformed when subjected to external forces, and have high stability.
[0012] The suspension members 5 are symmetrically arranged at both ends of the moving platform 1. One end of the connecting unit is rotatably hinged to the moving platform 1, and the other end is rotatably hinged to the suspension rod 5. The other end of the suspension rod 5 is rotatably hinged to the frame 2. During the working process, while the suspension rod 5 with one end rotatably hinged to the frame 2 rotates around the rotating pair connected to the frame 2, the other end of the suspension rod 5 is rotatably hinged to the connecting unit. The rotation of the suspension rod 5 around the rotating pair connected to the frame 2 will drive the connected connecting unit to move synchronously and in the opposite direction. The superposition of the synchronous and opposite movements of the connecting units symmetrically arranged at both ends of the moving platform 1 results in an approximate linear motion of the moving platform 1 in the plane.
[0013] To clearly illustrate the above movement process, we place the above movement process in a coordinate system: The center of the moving platform 1 is set as the coordinate origin o of the plane coordinate system o-xy, where x is the abscissa and y is the ordinate. The angle of rotation of the suspension rod 5 around the rotating pair of the frame 2 is given as α (note: a negative angle for left deviation and a positive angle for right deviation). Based on this, the relative position of the midpoint of the moving platform 1 with respect to the coordinate origin o is observed and recorded. When different lengths of each component are selected, the aspect ratio values of the moving platform 1 are different, but all are less than 2%. Therefore, the longitudinal movement can be ignored, and it can be considered that the moving platform 1 makes an approximate linear motion in the horizontal direction.
[0014] As Figure 2 shown, when the longitudinal dimension 1-1 of the moving platform 1 is selected as 20 units, the first horizontal dimension 1-2 is 102.12 units, the second horizontal dimension 1-3 is 150 units, the length dimensions 4-1 of the first connecting member 3 and the second connecting member 4 are both 120 units, the height dimension 5-1 of the suspension rod 5 is 100 units, the width dimension 5-2 of the suspension rod 5 is 40 units, and the horizontal distance between the left and right suspension rods 5 and the second horizontal dimension 1-3 are both 150 units, the following experimental data is obtained: From the data in the above table, when the angle α of rotation of the suspension rod 5 around the rotating pair of the frame 2 is between -11° and 11°, the moving platform 1 moves 66 units in the horizontal x-axis direction from -33 to 33, and only moves 0.8 units in the vertical y-axis direction from 0 to 0.8. With 0.8 relative to 66, the aspect ratio is 1.2%, and the longitudinal movement can almost be ignored. Therefore, it can be considered that the moving platform 1 makes an approximate linear motion in the horizontal direction between -11° and 11°.
[0015] Multiple experiments have proven that changing the values of the above dimensions results in different aspect ratios of the moving platform 1, but the aspect ratio of the moving platform 1 obtained each time is less than 2%. Therefore, the longitudinal movement of the moving platform 1 can be ignored, and it is considered that the moving platform 1 makes an approximate linear movement in the lateral direction, realizing that the movement trajectory of the moving platform 1 on the plane is an approximate linear movement.
[0016] As Figure 1 shown, the connecting unit includes a first connecting member 3 and a second connecting member 4. The first connecting member 3 and the second connecting member 4 are symmetrically arranged on both sides of the suspension member 5. One end of the first connecting member 3 and the second connecting member 4 is rotatably hinged to the suspension member 5, and the other end is rotatably hinged to the moving platform 1. The suspension member 5 rotates around the rotating pair of the frame 2, and the second connecting rod 3 and the second connecting rod 4 hinged to the other end of the suspension member 5 rotate around the rotating pair at the same time, thereby driving the rotation of the moving platform 1 hinged to the second connecting rod 3 and the second connecting rod 4. Therefore, the suspension members 5 symmetrically arranged at both ends of the moving platform 1 rotate with the rotating pair, and the superposition of the synchronous reverse movements of the connecting units on both sides driven by the suspension members 5 at both ends results in an approximate linear movement of the movement trajectory of the moving platform 1 on the plane.
[0017] Finally, it should be noted that the above embodiments are only examples for clearly explaining the present invention and are by no means limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to enumerate all the implementation manners here, and the obvious changes or variations in the lengths of the components derived therefrom still fall within the protection scope of the present invention.
Claims
1. A linear motion platform, characterized in that: It comprises a motion platform (1), a connection unit and a suspension rod (5), wherein the suspension member (5) is symmetrically arranged at two ends of the motion platform (1), one end of the connection unit is rotationally hinged to the motion platform (1), and the other end is rotationally hinged to the suspension rod (5), and the other end of the suspension rod (1) is rotationally hinged to the frame (2).
2. A linear motion platform according to claim 1, characterized in that: The connection unit comprises a first connection member (3) and a second connection member (4), wherein the first connection member (3) and the second connection member (4) are symmetrically arranged on both sides of the suspension member (5), and one end of the first connection member (3) and the second connection member (4) is rotatably hinged to the suspension member (5), and the other end is rotatably hinged to the motion platform (1).