Solid fluid combined precise driving device

Abstract

The utility model relates to the field of precise micro-operation, and provides a solid and fluid combined precise driving device which comprises a fluid chamber, a solid driving piece and a follow-up body. Part or all of the solid driving part is driven to enter and exit from the fluid cavity, so that the volume of the fluid cavity can be changed, and fluid in the fluid cavity drives the follow-up body to horizontally move or rotate. According to the utility model, the fluid chamber is designed in the shell and fixedly extends into the fluid chamber, so that the fluid becomes a driving force for driving the follow-up body to move, and the external diameter of the solid is designed to be smaller than the external diameter of the follow-up body, so that the requirements of ultra-precise and high-precision displacement driving are met; the problem of precise driving is solved in a mechanical driving mode, and the device is simple in structure, convenient to operate and easy to implement.

Description

Technical Field

[0001] The utility model relates to the field of precision micro-operation, in particular to a solid-fluid combination precision driving device, and in particular to a device that generates precision driving by causing a solid to enter and exit a fluid chamber and cause a change in the total volume of the enclosed fluid and the solid. Background Art

[0002] With the rapid development of micro-precision technology, the fields of aerospace, medical, life sciences, etc. have put forward increasingly higher requirements on the accuracy, speed, stability, driving force and stroke of precision linear displacement drives. The positioning accuracy directly affects the accuracy of production and processing.

[0003] At present, precision linear displacement drive is mostly solved by intelligent material technology. For example, piezoelectric material drive technology can realize the conversion of electrical energy into mechanical energy, which can meet the requirements of precision drive. However, the traditional mechanical drive method, the linear drive is limited by its working principle and mechanical structure, and cannot meet the requirements of ultra-precision and high-precision displacement drive. How to solve the problem of precision drive through mechanical drive is a technical problem in this field. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide a solid-fluid combination precision driving device, specifically a device that produces precision driving by causing a solid to enter and exit a fluid chamber, causing a change in the total volume of the enclosed fluid and solid.

[0005] According to the utility model, a solid-fluid combination precision driving device is provided, including a fluid chamber, a solid driving member and a follower. Driving part or all of the solid driving member in and out of the fluid chamber can cause the volume of the fluid chamber to change so that the fluid in the fluid chamber drives the follower to produce translational motion or rotation. The fluid is an incompressible fluid, and the cross-sectional area of ​​the translational follower or the rotational area of ​​the rotational follower is greater than the cross-sectional area of ​​the solid driving member.

[0006] Preferably, the cross-sectional area of ​​the translation follower or the area of ​​the rotation surface of the rotation follower is smaller than, equal to or larger than the cross-sectional area of ​​the solid driving member.

[0007] Preferably, it comprises: a driving housing, a closed end arranged on the driving housing, a follower arranged on the output end of the driving housing, and a power mechanism drivingly connected to one end of the solid driving member;

[0008] The driving housing, the closed end, and the follower body form the fluid chamber, the power mechanism is arranged outside the fluid chamber, and the other end of the solid driving member extends through the closed end to the inside of the fluid chamber. When the power mechanism is running, it can drive the other end of the solid driving member to move toward or away from the fluid chamber, thereby causing the total volume of the contents in the fluid chamber to change, thereby driving the follower body to move.

[0009] Preferably, the solid driving member and the closed end can be matched in any of the following ways:

[0010] The solid driving member is a cylindrical structure with external threads on the surface, and the middle part of the closed end is a rigid internal thread hole matching the external threads;

[0011] The solid driving member is a cylindrical structure with external threads on the surface, the middle part of the closed end is a flexible internal thread hole matching the external threads, and the external threads and the internal thread hole are interference fit;

[0012] The solid driving member is a cylindrical structure with external threads on the surface, and the middle part of the closed end is a flexible structure;

[0013] The solid driving member includes a transmission member and a plurality of filling bodies sequentially arranged on the transmission member, the transmission member passes through the fluid chamber and both ends extend to the outside of the fluid chamber, and the middle part of the closed end is a flexible structure having a through hole;

[0014] The solid driving member is a smooth cylindrical structure, the middle part of the closed end is a flexible structure with a through hole, the driving housing is drivingly connected to the power mechanism, and when the power mechanism is running, it can move along the inner wall of the driving housing and drive the solid driving member to move in the axial direction.

[0015] Preferably, the power mechanism is arranged inside the drive housing and slidingly cooperates with the inner wall of the drive housing.

[0016] Preferably, a displacement sensor is provided on the power mechanism, and the displacement sensor is used to collect the motion displacement of the power mechanism, thereby enabling the power mechanism to stop at a target position.

[0017] Preferably, there are multiple solid driving members, each of which is connected to a power mechanism and the movements of the multiple solid driving members do not interfere with each other.

[0018] Preferably, the number of the followers is one or more, and the shapes of the multiple followers are all the same, partially the same, or all different, wherein the followers can be arranged on the drive housing at different angles.

[0019] Preferably, a spring is provided between the follower and the drive housing; and / or

[0020] The follower is provided with a limiting structure to prevent itself from being separated from the driving housing.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model designs a fluid chamber in a shell and extends the fluid chamber in a fixed manner, so that the fluid becomes the driving force for driving the follower to move. The outer diameter of the solid is designed to be smaller than the outer diameter of the follower to meet the requirements of ultra-precision and high-precision displacement drive, and the problem of precision drive is solved by mechanical drive. The utility model has a simple structure, convenient operation and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 It is a schematic diagram of the structure in which the follower body in the device of the utility model generates translational motion;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the follower body in the device of the utility model that generates rotation;

[0026] Figure 3 It is a schematic diagram of the structure when multiple followers are arranged in the device of the utility model, wherein the middle part of the closed end is a rigid internal threaded hole;

[0027] Figure 4 It is a schematic diagram of the structure when multiple followers are arranged in the device of the utility model, wherein the middle part of the closed end is a flexible structure;

[0028] Figure 5 It is a schematic diagram of the structure of the follower body generating translational motion in the device of the utility model, wherein the solid driving member includes a transmission member and a plurality of filling bodies sequentially arranged on the transmission member.

[0029] The figure shows:

[0030] Drive housing 1

[0031] Fluid chamber 11

[0032] Fixed plate 12

[0033] Closed end 2

[0034] Follower 3

[0035] Seal 31

[0036] Power mechanism 4

[0037] Solid state drive 5

[0038] Transmission parts 51

[0039] Filling body 52

[0040] Spring 6

[0041] Flexible structure 7 DETAILED DESCRIPTION

[0042] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0043] Embodiment 1:

[0044] The utility model provides a solid-fluid combined precision driving device, comprising a driving housing 1, a closed end 2 arranged on the driving housing 1, a follower 3 arranged at the output end of the driving housing 1, a solid driving member 5, and a power mechanism 4 drivingly connected to one end of the solid driving member 5, driving part or all of the solid driving member 5 to enter and exit a fluid chamber 11 can cause a volume change of the contents of the fluid chamber 11 so that the fluid in the fluid chamber 11 drives the follower 3 to produce translation and / or rotation, and the fluid is an incompressible fluid, and the fluid is preferably a liquid.

[0045] Specifically, the cross-sectional area of ​​the translational follower 3 or the rotational area of ​​the rotational follower 3 is denoted as S1, and the cross-sectional area of ​​the solid driving member 5 is denoted as S2. S1 can be designed to be greater than, equal to or less than S2. The cross-sectional area of ​​the solid driving member 5, when S1>S2, can slow down the movement speed of the follower 3 and obtain the effect of ultra-precision and high-precision displacement drive. The greater the difference between the two, the higher the precision, which solves the problem of achieving precision drive through mechanical structure. When S1=S2, compared with the threaded torque drive method used in the prior art, the fluid drive can reduce the fluctuation generated by the drive, which can make the drive of the entire follower 3 smoother. When S1<S2, the movement speed of the follower 3 can be improved to meet the needs of different application scenarios.

[0046] Furthermore, a fluid chamber 11 is formed between the driving shell 1, the closed end 2, and the follower 3. The fluid chamber 11 can be a space with the same cross-sectional area at the front and rear ends, or can be designed as a stepped structure. The fluid chamber 11 is filled with fluid, and the power mechanism 4 is arranged outside the fluid chamber 11. The other end of the solid driving member 5 extends through the closed end 2 to the inside of the fluid chamber 11. When the power mechanism 4 is running, it can drive the other end of the solid driving member 5 to move toward or away from the follower 3. The solid driving member 5 entering the fluid chamber 11 or coming out of the fluid chamber 11 will cause the volume of the contents of the fluid chamber 11 to change, so that the fluid chamber 11 becomes larger or smaller. When the solid driving component 5 enters the fluid chamber 11, causing the volume of the fluid chamber 11 to tend to increase, the internal fluid is squeezed and drives the follower 3 to move toward the outside of the driving shell 1; when the solid driving component 5 comes out of the fluid chamber 11, causing the volume of the fluid chamber 11 to tend to decrease, a local transient vacuum is formed inside, the pressure tends to decrease, and the external atmospheric pressure drives the follower 3 to move toward the inside of the driving shell 1.

[0047] It should be noted that the follower 3 is sealed and connected to the drive housing 1. Preferably, a seal 31 is provided between the follower 3 and the drive housing 1. During the specific design, one or more seals 31 may be designed according to the sealing requirements. The seal 31 may be made of rubber, silicone, fluororubber, fluorosilicone rubber, etc.

[0048] The solid driving member 5 in this embodiment is a cylindrical structure with an external thread on the surface, and the middle part of the closed end 2 has a rigid internal thread hole matching the external thread. The sealing during the rotation process is achieved by improving the processing accuracy between the external thread of the cylindrical structure and the internal thread hole. The power mechanism 4 is arranged inside the drive housing 1 and slides with the inner wall of the drive housing 1. When the power mechanism 4 rotates forward, it can drive the solid driving member 5 to rotate, and move along the axial direction of the internal thread hole close to the follower 3 to squeeze the fluid in the fluid chamber 11, thereby driving the follower 3 to move toward the outside of the drive housing 1. When the power mechanism 4 rotates in the reverse direction, it can drive the solid driving member 5 to rotate, and move along the axial direction of the internal thread hole away from the follower 3 to reduce the pressure in the fluid chamber 11, and the external pressure drives the follower 3 to move toward the inside of the drive housing 1.

[0049] like Figure 1 As shown, the ratio of the inner diameter of the fluid chamber 11 to the outer diameter of the solid driving member 5 can be designed to match different driving accuracies. Specifically, the displacement of the solid driving member 5 is δs1, and the displacement of the follower 3 caused by δs1 is δs2, then:

[0050] δs2×π(R2) 2 =δs1×π(R1)2 (1)

[0051] After simplifying formula (1), we can get formula (2):

[0052]

[0053] Among them, R1 represents the radius of the solid driving member 5, and R2 represents the radius of the follower 3. It can be seen from formula (2) that the displacement of the follower 3 is δs2, which is proportional to the displacement of the solid driving member 5 is δs1, and the proportional coefficient is the square of the ratio of the radius of the solid driving member 5 to the radius of the follower 3. Therefore, by adjusting the size of the radius of the solid driving member 5 or the size of the radius of the follower 3, the displacement and force required for the output can be flexibly adjusted. By designing the solid driving member 5 with a small outer diameter and designing the follower 3 with a large outer diameter, the micro-displacement precision movement of the follower 3 can be achieved, and the corresponding precision movement effect can be achieved.

[0054] Furthermore, a displacement sensor is provided on the power mechanism 4, and the displacement sensor is used to collect the motion displacement of the power mechanism 4, so that the power mechanism 4 can accurately stop at the target position. In practical applications, after the displacement required to be moved by the follower 3 is determined, the displacement required to be moved by the solid driving member 5 can be calculated according to formula (2). A slide groove is provided on the inner wall of the drive housing 1, and a boss matching the slide groove is provided on the outer shell of the power mechanism 4. When the power mechanism 4 is running, the driving force brought by the threaded matching structure enables the power mechanism 4 to slide under the guidance of the slide groove.

[0055] It should be noted that the number of the follower 3 is one or more, and the shapes of the multiple follower 3 are all the same, partially the same, or different. The multiple follower 3 can also be designed to have a situation where translation and rotation coexist to achieve corresponding effects. Among them, the follower 3 can be arranged on the drive housing 1 at different angles, such as Figure 3 As shown, a spring 6 is provided between the follower 3 and the driving housing 1 , and the spring 6 can effectively prevent the follower 3 from being separated from the driving housing 1 . Of course, in order to prevent the follower 3 from being separated from the driving housing 1 , a limiting structure to prevent separation can be provided on the follower 3 .

[0056] The utility model only designs one fluid chamber, which is easy to implement. The solid driving member 5 is solid, and the volume input change is more accurate, resulting in more accurate fluid segment output displacement. The solid segment is easier to seal when it is rotated and pushed into the fluid chamber 11 with a small diameter. The solid segment in the utility model has various ways of pushing in, and inaccurate pushing is converted into accurate or precise pushing. At the same time, small input force can generate large output force, and the structure is simple and engineering application is easy to implement.

[0057] Embodiment 2:

[0058] The difference between this embodiment and embodiment 1 is that, in this embodiment, the solid driving member 5 is a smooth cylindrical structure, and the driving housing 1 is connected to the power mechanism 4. When the power mechanism 4 is running, it can move along the inner wall of the driving housing 1 and drive the solid driving member 5 to move in the axial direction, thereby driving the fluid in the fluid chamber 11. For example, a rack can be arranged on the inner wall of the driving housing 1, and a gear matching the rack is arranged circumferentially of the power mechanism 4. When the power mechanism 4 rotates, it drives the gear to rotate forward or reverse, thereby realizing movement along the direction of the rack.

[0059] Embodiment 3:

[0060] The difference between this embodiment and embodiment 1 is that the solid driving component 5 in this embodiment is a cylindrical structure with external threads on the surface, and the middle part of the closed end 2 is a flexible internal threaded hole with matching external threads. The external threads and the internal threaded hole have an interference fit, so that the solid driving component 5 can be sealed through the flexible internal threaded hole when rotating.

[0061] Embodiment 4:

[0062] The difference between this embodiment and embodiment 1 is that the solid driving member 5 in this embodiment is a cylindrical structure with external threads on the surface, and the middle part of the closed end 2 is a flexible structure 7, such as Figure 4 As shown, when the solid driving member 5 rotates, the flexible structure 7 adaptively forms a thread structure so that a sealed fit is always formed between the flexible structure 7 and the solid driving member 5 .

[0063] Embodiment 5:

[0064] The difference between this embodiment and embodiment 1 is that the solid driving member 5 in this embodiment includes a transmission member 51 and a plurality of filling bodies 52 arranged sequentially on the transmission member 51, the transmission member 51 penetrates the fluid chamber 11 and both ends extend to the outside of the fluid chamber 11, and the middle part of the closed end 2 is a flexible structure 7, such as Figure 5 As shown, when one end of the transmission member 51 is pulled toward the other end, the filling body 52 can be driven to pass through the flexible structure 7. The flexible structure 7 adapts to the entry and exit of the filling body 52 and forms a space that is sealed and fits with the filling body 52, thereby achieving the effect that the filling body 52 can pass through the flexible structure 7 in a sealed manner.

[0065] In practical applications, the transmission member 51 may be a wire, a rod, a rope, etc. In addition, the plurality of filling bodies 52 may be designed to have the same shape or different shapes, and the specific design may be flexible.

[0066] Embodiment 6:

[0067] The difference between this embodiment and embodiment 1 is that there are multiple solid driving components 5, and the multiple solid driving components 5 can be designed to have different outer diameters, and can be designed as multiple driving mechanisms 4 respectively connected to one solid driving component 5 to achieve the requirement of precision driving. Each solid driving component 5 is connected to a power mechanism 4 and the movements of the multiple solid driving components 5 do not interfere with each other, thereby achieving the corresponding precision driving effect.

[0068] In practical applications, the multiple solid driving elements 5 can be set to different driving directions to meet different application scenarios and improve the versatility of the device.

[0069] Embodiment 7:

[0070] The difference between this embodiment and embodiment 1 is that driving part of the solid driving member 5 into and out of the fluid chamber 11 can cause the volume of the fluid chamber 11 to change so that the fluid in the fluid chamber 11 drives the follower 3 to rotate, and the fluid is a liquid, such as Figure 2 As shown, one side of the fluid chamber 11 is a fixed plate 12, and the other side is a follower 3. The follower 3 is preferably a plate-shaped structure and can rotate about the rotating shaft at the old end. A fan-shaped area is formed between the fixed plate 12, the follower 3 and the drive housing 1. The solid driving member 5 extends into the fan-shaped area. When axial movement occurs, the pressure in the fan-shaped area changes, thereby driving the follower 3 to rotate. In this embodiment, the follower 3 is made to rotate slightly and precisely by extending the solid into the liquid, thereby achieving the effect of precision driving.

[0071] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0072] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A solid-fluid combination precision driving device, characterized in that: The invention comprises a fluid chamber (11), a solid driving member (5) and a follower (3), wherein driving part or all of the solid driving member (5) into and out of the fluid chamber (11) can cause the volume of the fluid chamber (11) to change, so that the fluid in the fluid chamber (11) drives the follower (3) to produce translational motion and / or rotational motion, the fluid is an incompressible fluid, and the cross-sectional area of ​​the follower (3) producing translational motion or the rotational area of ​​the follower (3) producing rotational motion is greater than the cross-sectional area of ​​the solid driving member (5); It also comprises: a drive housing (1), a closed end (2) arranged on the drive housing (1), and a power mechanism (4) drivingly connected to one end of the solid drive member (5), wherein the follower (3) is arranged on the output end of the drive housing (1); The driving housing (1), the closed end (2), and the follower (3) form the fluid chamber (11); the power mechanism (4) is arranged outside the fluid chamber (11); the other end of the solid driving member (5) passes through the closed end (2) and extends into the interior of the fluid chamber (11); when the power mechanism (4) is in operation, the other end of the solid driving member (5) can be driven to move toward or away from the fluid chamber (11), thereby causing the volume of the fluid chamber (11) to change, thereby driving the follower (3) to move.

2. The device according to claim 1, characterized in that The solid driving member (5) and the closed end (2) can be matched in any of the following ways: The solid driving member (5) is a cylindrical structure with an external thread on the surface, and the middle portion of the closed end (2) is a rigid internal thread hole matching the external thread; The solid drive member (5) is a cylindrical structure with an external thread on the surface, the middle portion of the closed end (2) is a flexible internal thread hole matching the external thread, and the external thread and the internal thread hole are interference fit; The solid driving member (5) is a cylindrical structure with external threads on the surface, and the middle part of the closed end (2) is a flexible structure (7); The solid driving member (5) comprises a transmission member (51) and a plurality of filling bodies (52) arranged in sequence on the transmission member (51); the transmission member (51) penetrates the fluid chamber (11) and both ends extend to the outside of the fluid chamber (11); the middle portion of the closed end (2) is a flexible structure (7); The solid driving member (5) is a smooth cylindrical structure, the middle portion of the closed end (2) is a flexible structure (7) having a through hole, the driving housing (1) and the power mechanism (4) are drivingly connected, and when the power mechanism (4) is in operation, it can move along the inner wall of the driving housing (1) and thereby drive the solid driving member (5) to move in an axial direction.

3. The device according to claim 2, characterized in that The power mechanism (4) is arranged inside the drive housing (1) and is slidably engaged with the inner wall of the drive housing (1).

4. The device according to claim 1, characterized in that The power mechanism (4) is provided with a displacement sensor, which is used to collect the movement displacement of the power mechanism (4), thereby enabling the power mechanism (4) to stop at a target position.

5. The device according to claim 1, characterized in that The number of the solid driving components (5) is plural.

6. The device according to claim 5, characterized in that Each of the solid driving members (5) is connected to a power mechanism (4), and the movements of the multiple solid driving members (5) do not interfere with each other.

7. The device according to claim 1, characterized in that The number of the followers (3) is one or more, and the shapes of the multiple followers (3) are all the same, partially the same, or all different.

8. The device according to claim 7, characterized in that The follower (3) can be arranged on the drive housing (1) at different angles.

9. The device according to claim 1, characterized in that A spring (6) is provided between the follower (3) and the drive housing (1); and / or The follower (3) is provided with a limiting structure for preventing itself from being separated from the drive housing (1).

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