Magnetic power-assisted motion platform

Abstract

The utility model relates to the field of motion platforms, in particular to a magnetic assistance motion platform which comprises a base and a carrier plate, the base and the carrier plate are connected through a driving assembly, and the driving assembly can drive the carrier plate to reciprocate. The base is connected with a power assisting assembly, and the power assisting assembly comprises fixed magnetic steel fixedly connected to the base and movable magnetic steel fixedly connected to the carrier plate. The at least two fixed magnetic steels are symmetrically arranged on the two sides of the movable magnetic steel; the two pieces of movable magnetic steel are arranged in the moving direction of the carrier plate and are symmetrically connected through a metal block. And the metal block is arranged in the middle of the fixed magnetic steel in the moving direction of the carrier plate. By arranging the magnetic assistance assembly, the magnetic force and the load can be balanced, equivalently, the driving assembly is in zero-load driving, and the problem that the driving precision is affected by load heating of the driving device is greatly solved; and instability factors caused by the adoption of a spring in the prior art are avoided, so that the movement precision of the movement platform is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motion platforms, in particular to a magnetic-assisted motion platform. Background Art

[0002] In gene sequencing detection equipment, the objective lens needs to be constantly moved within a range of about ±2.5mm for real-time focusing, and a high-precision and high-stability motion platform is needed to load the objective lens. In the prior art, when the motion platform drives the objective lens to move, in order to reduce the load of the motion platform itself and increase the accuracy and service life of the motion platform, a spring is provided to support the motion end of the motion platform to offset the load. However, the range of variation of the force value is large when the spring is compressed or stretched, and fatigue is easily generated in long-term use, and there are many uncontrollable factors, which will affect the motion accuracy of the motion platform. Therefore, how to offset the load of the motion platform and ensure the stability and accuracy of its motion are issues that those skilled in the art need to consider. Utility Model Content

[0003] The utility model aims to provide a magnetic-assisted motion platform to solve the problems of unstable motion and poor precision of the motion platform in the prior art.

[0004] The technical solution of the utility model is: a magnetic assist motion platform, comprising a base and a carrier plate, wherein the base and the carrier plate are connected via a driving component, and the driving component can drive the carrier plate to reciprocate;

[0005] The base is connected to a power-assisting assembly, which includes a fixed magnetic steel fixedly connected to the base and a moving magnetic steel fixedly connected to the carrier; at least two fixed magnetic steels are provided and are symmetrically arranged on both sides of the moving magnetic steel; two moving magnetic steels are provided in the movement direction of the carrier and are symmetrically connected by a metal block; the metal block is arranged in the center of the fixed magnetic steel in the movement direction of the carrier.

[0006] Preferably, the base includes an upper connecting plate and a lower connecting plate parallel to the upper connecting plate, and a fixing plate disposed between the upper connecting plate and the lower connecting plate and perpendicular to the two.

[0007] Preferably, the driving assembly includes a stator and a mover, the stator is connected to a fixed plate; the two sides of the mover are respectively connected to a symmetrical first connecting plate and a second connecting plate, and the same end of the first connecting plate and the second connecting plate extends to be connected to the carrier plate; the first connecting plate and the second connecting plate are both connected to the fixed plate through a guide rail assembly, and the mover drives the carrier plate to reciprocate while moving along the guide rail assembly.

[0008] Preferably, the first connecting plate is connected to a sensing plate at one end away from the carrier plate, and the upper connecting plate and the lower connecting plate are both connected to sensors that can sense the sensing plate. When the carrier plate reciprocates and the two sensors sense the sensing plates in turn, the carrier plate moves in two opposite directions to a maximum stroke.

[0009] Preferably, the end of the second connecting plate away from the carrier plate is connected to a grating ruler;

[0010] The upper connecting plate and the lower connecting plate are connected with a rear connecting plate, and the rear connecting plate is at one end of the fixed plate away from the carrier plate. A grating sensor cooperating with the grating ruler is connected to the rear connecting plate. When the carrier plate reciprocates, the travel distance is confirmed by the induction of the grating sensor and the grating ruler.

[0011] Preferably, the fixed magnetic steel is connected to the lower connecting plate through a first supporting plate; the dynamic magnetic steel is connected to the carrier plate through a supporting plate.

[0012] Preferably, a left connecting plate and a right connecting plate are respectively connected to both sides of the upper connecting plate and the lower connecting plate, and the left connecting plate and the right connecting plate are perpendicular to the fixing plate.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] (1) By setting up a magnetic assist component, the magnetic force and the load can be balanced, which is equivalent to a zero-load drive of the drive component, greatly reducing the problem of load heating of the drive device affecting the drive accuracy; it also avoids the instability factor when using traditional springs, thereby further increasing the motion accuracy of the motion platform; in addition, according to the change of load, the relative position of the fixed magnet and the moving magnet can be adjusted to cope with different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the structure of the magnetic-assisted motion platform of the utility model;

[0017] Figure 2 The internal structure of the magnetic-assisted motion platform of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 3 The internal structure of the magnetic-assisted motion platform of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 4 This is a schematic diagram of the structure of the power assist component of the utility model;

[0020] Figure 5This is a schematic diagram of the structure of the drive assembly of the utility model;

[0021] Figure 6 It is a schematic diagram of the top view of the driving assembly of the utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the simulation diagram of the magnetic flux lines of the fixed magnetic steel and the dynamic magnetic steel of the utility model;

[0023] Figure 8 It is a schematic diagram of the dynamic magnetic steel load curve of the utility model.

[0024] Wherein: base 1, upper connecting plate 11, lower connecting plate 12, fixing plate 13, left connecting plate 14, right connecting plate 15, rear connecting plate 16, grating sensor 161;

[0025] Carrier board 2;

[0026] Driving assembly 3, stator 31, mover 32, first connecting plate 321, second connecting plate 322, induction plate 323, inductor 324, grating ruler 325;

[0027] Guide rail assembly 4;

[0028] The power assist assembly 5 , the fixed magnetic steel 51 , the first support plate 511 , the moving magnetic steel 52 , the support plate 521 , and the metal block 522 . DETAILED DESCRIPTION

[0029] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0030] The magnetic-assisted motion platform described in this application is mainly used for real-time focusing of the objective lens in the gene sequencer. The focal length adjustment distance is about ±2.5mm. The motion platform needs to drive the objective lens to move at high speed and precision within this range to ensure accurate collection of gene sequencing images and data information. Figure 1-Figure 3 As shown, the base 1 is fixedly mounted on the gene sequencer device; the objective lens and its related components are mounted on the carrier plate, and the objective lens can be driven by the driving component to reciprocate in the vertical direction to adjust the focal length. The objective lens and the carrier plate are used as the vertical direction as the movement reference for specific description, specifically: the base 1 and the carrier plate 2 are connected by the driving component 3, and the driving component 3 can drive the carrier plate 2 to reciprocate.

[0031] The base 1 includes an upper connecting plate 11 and a lower connecting plate 12 parallel to the upper connecting plate 11, and a fixing plate 13 disposed between the upper connecting plate 11 and the lower connecting plate 12 and perpendicular to the two. The left connecting plate 14 and the right connecting plate 15 are connected to the two sides of the upper connecting plate 11 and the lower connecting plate 12, respectively, and the left connecting plate 14 and the right connecting plate 15 are perpendicular to the fixing plate 13. The upper connecting plate 11 and the lower connecting plate 12 are connected to the rear connecting plate 16, and the rear connecting plate 16 is at one end of the fixing plate 13 away from the carrier 2. Among them, the base 1 is in the shape of a cube with approximately six sides, and the upper connecting plate 11, the lower connecting plate 12, the left connecting plate 14, the right connecting plate 15 and the rear connecting plate 16 are the five faces of this "cube", the fixing plate 13 is connected to the inside of the base 1 and is parallel to the rear connecting plate 16; and the carrier 2 is perpendicular to the fixing plate 13 and the rear connecting plate 16 and is connected to the fixing plate 13 through the driving assembly 3.

[0032] like Figure 5-Figure 6 As shown, the driving assembly 3 includes a stator 31 and a mover 32, and the stator 31 is connected to the fixed plate 13; the two sides of the mover 32 are respectively connected with a symmetrical first connecting plate 321 and a second connecting plate 322, and the same end of the first connecting plate 321 and the second connecting plate 322 extends to connect with the carrier 2; the first connecting plate 321 and the second connecting plate 322 are both connected to the fixed plate 13 through the guide rail assembly 4, and the mover 32 drives the carrier 2 to reciprocate while moving along the guide rail assembly 4. In this embodiment, in order to ensure the accuracy and speed of focal length adjustment, the driving assembly 3 can adopt a linear motor, and of course other forms of driving methods can also be adopted according to requirements. The guide rail assembly 4 is provided with at least two groups, which are respectively arranged on both sides of the fixed plate 13 and are respectively connected to the first connecting plate 321 and the second connecting plate 322 to ensure the stability of the movement of the mover 32, and then ensure the stability of the movement of the carrier 2.

[0033] The first connecting plate 321 is connected to a sensing plate 323 at one end away from the carrier 2, and the upper connecting plate 11 and the lower connecting plate 12 are both connected to sensors 324 that can sense the sensing plate 323. When the carrier 2 reciprocates, the two sensors 324 sense the sensing plate 323 in turn, that is, the two sensors 324 are respectively at the maximum stroke of the two directions of the reciprocating motion of the carrier 2. When one of the sensors 324 senses the sensing plate 323, it means that the carrier 2 moves to the maximum stroke in this direction. In this embodiment, the sensor is an electrical limiter, and other forms of limiters can also be used according to actual needs in other embodiments. Of course, the positions of the two sensors 324 in the vertical direction can be adjusted according to actual needs to adjust the travel distance of the carrier 2; in addition, in actual operation, according to the adjustment effect of the actual focal length of the objective lens, the reciprocating motion of the carrier 2 does not necessarily reach the maximum stroke every time. Specifically, a grating ruler 325 is connected to the end of the second connecting plate 322 away from the carrier plate 2; a grating sensor 161 that cooperates with the grating ruler 325 is connected to the rear connecting plate 16. When the carrier plate 2 moves back and forth, the travel distance is monitored by the induction of the grating sensor 161 and the grating ruler 325, thereby further increasing the adjustment accuracy of the objective lens focal length.

[0034] It should be noted that the connection position of the mover 32 to the first connecting plate 321 and the second connecting plate 322 is close to the middle position of the two, and loads are connected to both ends of the first connecting plate 321 and the second connecting plate 322, such as one end of the first connecting plate 321 is connected to the carrier plate 2, and the other end is connected to the sensing plate 323; one end of the second connecting plate 322 is connected to the carrier plate 2, and the other end is connected to the grating ruler 325. The loads at both ends also play a certain balancing role, further ensuring the stability of the movement of the mover 32.

[0035] like Figure 4 As shown, a power assist component 5 is connected to the base 1, and the power assist component 5 includes a fixed magnetic steel 51 fixedly connected to the base 1, and a dynamic magnetic steel 52 fixedly connected to the carrier plate 2, wherein the fixed magnetic steel 51 is connected to the lower connecting plate 12 via a first support plate 511; and the dynamic magnetic steel 52 is connected to the carrier plate 2 via a support plate 521. At least two fixed magnetic steels 51 are provided and are symmetrically arranged on both sides of the dynamic magnetic steel 52; two dynamic magnetic steels 52 are provided in the vertical direction and are symmetrically connected by a metal block 522; and the metal block 522 is arranged at the center of the fixed magnetic steel 51 in the vertical direction. In this embodiment, in the vertical direction, the positive and negative pole directions of the two fixed magnetic steels 51 and the two dynamic magnetic steels 52 are the same, such as Figure 7 The figure shows the simulated distribution of magnetic flux lines of the moving magnetic steel 52 and the fixed magnetic steel 51. Figure 8As shown, it is the force condition of the moving magnet 52 when it moves in the vertical direction. The four curves in the figure are the force conditions when the spacing between the fixed magnet and the moving magnet is 0mm, 2mm, 4mm, and 5mm from top to bottom. The stroke is zero when the metal block 522 is in the center of the fixed magnet 51 in the vertical direction; multiple groups of curves are different spacings between the moving magnet 52 and the fixed magnet 51. It can be obtained that when the moving magnet 52 moves in a stroke of ±2mm, the force value basically fluctuates up and down on a horizontal straight line, which can be considered to be stable. It can be obtained that in the stroke of ±2mm, the load of the moving magnet 52 is stable, and then the load of the carrier is completely borne by the power assist component 5, which can realize the no-load or extremely low-load operation of the drive component 3, and greatly improve the accuracy of the drive movement of the drive component 3 and the service life of the drive component 3. In actual verification, the driving accuracy of the drive component 3 reaches ±2μm; the temperature of the drive component 3 is always close to room temperature for a long time and does not change. In addition, it should be noted that by Figure 7-Figure 8 It can be seen that, according to different loads, the magnetic force and the load balance can be achieved by adjusting the distance between the moving magnetic steel 52 and the fixed magnetic steel 51 and / or replacing the moving magnetic steel 52 and the fixed magnetic steel 51 with different magnetic strengths.

[0036] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

Claims

1. A magnetic-assisted motion platform, characterized in that: It includes a base and a carrier plate, wherein the base and the carrier plate are connected via a driving assembly, and the driving assembly can drive the carrier plate to reciprocate; The base is connected to a power-assisting assembly, which includes a fixed magnetic steel fixedly connected to the base and a moving magnetic steel fixedly connected to the carrier; at least two fixed magnetic steels are provided and are symmetrically arranged on both sides of the moving magnetic steel; two moving magnetic steels are provided in the movement direction of the carrier and are symmetrically connected by a metal block; the metal block is arranged in the center of the fixed magnetic steel in the movement direction of the carrier.

2. A magnetic-assisted motion platform according to claim 1, characterized in that: The base comprises an upper connecting plate, a lower connecting plate parallel to the upper connecting plate, and a fixing plate arranged between the upper connecting plate and the lower connecting plate and perpendicular to the two.

3. A magnetic-assisted motion platform according to claim 2, characterized in that: The driving assembly includes a stator and a mover, the stator is connected to a fixed plate; the two sides of the mover are respectively connected to a symmetrical first connecting plate and a second connecting plate, and the same end of the first connecting plate and the second connecting plate extends to be connected to the carrier plate; the first connecting plate and the second connecting plate are both connected to the fixed plate through a guide rail assembly, and the mover drives the carrier plate to reciprocate while moving along the guide rail assembly.

4. A magnetic-assisted motion platform according to claim 3, characterized in that: The end of the first connecting plate away from the carrier plate is connected to a sensing plate, and the upper connecting plate and the lower connecting plate are both connected to sensors that can sense the sensing plate. When the carrier plate reciprocates and the two sensors sense the sensing plates in turn, the carrier plate moves in two opposite directions to a maximum stroke.

5. The magnetic-assisted motion platform according to claim 4, characterized in that: One end of the second connecting plate away from the carrier plate is connected to a grating ruler; The upper connecting plate and the lower connecting plate are connected with a rear connecting plate, and the rear connecting plate is at one end of the fixed plate away from the carrier plate. A grating sensor cooperating with the grating ruler is connected to the rear connecting plate. When the carrier plate reciprocates, the travel distance is confirmed by the induction of the grating sensor and the grating ruler.

6. The magnetic-assisted motion platform according to claim 1, characterized in that: The fixed magnetic steel is connected to the lower connecting plate through the first supporting plate; the dynamic magnetic steel is connected to the carrier plate through the supporting plate.

7. The magnetic-assisted motion platform according to claim 2, characterized in that: The left connecting plate and the right connecting plate are respectively connected to the two sides of the upper connecting plate and the lower connecting plate, and the left connecting plate and the right connecting plate are perpendicular to the fixing plate.

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