Actuator of two-stage transmission structure

Abstract

The actuator of the two-stage transmission structure comprises a fixed sleeve, a push rod assembly, a coarse adjustment assembly and a fine adjustment assembly, the push rod assembly comprises an inner rod and an outer rod connected to the inner rod in a sleeving mode, and the inner rod is arranged on the outer rod in a sliding mode; the coarse adjustment assembly comprises a coarse adjustment rotating seat, a cavity is formed in the coarse adjustment rotating seat, the fine adjustment assembly comprises a fine adjustment shaft, a matching ring, a plurality of pushing balls and a pushing block which are sequentially arranged, a first matching surface is formed in an inner hole of the matching ring, the fine adjustment shaft is in threaded connection to the coarse adjustment assembly, and a conical extrusion head is arranged on the fine adjustment shaft; a second matching face is formed on the outer peripheral wall of the conical extrusion head, the multiple pushing balls are arranged between the first matching face and the second matching face, one end of the pushing block abuts against the pushing balls, and the other end of the pushing block abuts against the inner rod. The fine adjustment assembly in the actuator of the two-stage transmission structure can further decompose the axial movement of the fine adjustment shaft through the cooperation of the fine adjustment shaft, the matching ring, the pushing ball and the pushing block, so that the adjustment precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of optical system technology, and in particular to an actuator with a two-stage transmission structure. Background Technology

[0002] In optical systems, multi-axis adjustment platforms use actuators (commonly known as micrometer heads) for adjustment. Existing micrometer heads have a two-stage adjustment structure, enabling coarse and fine adjustments. Generally, threaded transmission is used to move the push rod. However, the fine adjustment accuracy of existing micrometer heads is not high enough to meet the requirements of some high-precision optical systems. In addition, the frictional contact surface between the internal components of existing micrometer heads is relatively large. For example, when rotating the first component to drive the second component to move axially, the frictional contact surface between the first and second components is too large, causing the first component to drive the second component to rotate, thus affecting the adjustment accuracy. Utility Model Content

[0003] In view of this, the present invention proposes an actuator with a two-stage transmission structure, which aims to address the problem of insufficient adjustment accuracy of existing actuators.

[0004] The technical solution of this utility model is implemented as follows:

[0005] An actuator with a two-stage transmission structure includes:

[0006] A fixing sleeve, wherein the fixing sleeve is provided with a connecting hole;

[0007] A push rod assembly includes an inner rod and an outer rod sleeved on the inner rod. The outer rod is threaded to the connecting hole of the fixed sleeve. The inner rod is slidably disposed on the outer rod. Both ends of the inner rod protrude beyond the outer rod. A limiting member is provided on the first end of the inner rod.

[0008] A coarse adjustment assembly includes a coarse adjustment rotating seat, which is fixedly connected to one end of the outer rod; the coarse adjustment rotating seat has a cavity inside, and the first end of the inner rod extends into the cavity.

[0009] The fine-tuning assembly includes a fine-tuning shaft, a mating ring, multiple push balls, and a push block arranged sequentially. The mating ring is fixedly disposed in the cavity, and the inner hole of the mating ring forms a tapered first mating surface. The fine-tuning shaft is threadedly connected to the coarse-tuning assembly. One end of the fine-tuning shaft is provided with a tapered extrusion head, and the outer peripheral wall of the tapered extrusion head forms a tapered second mating surface. The multiple push balls are disposed between the first and second mating surfaces. One end of the push block abuts against the push balls, and the other end abuts against the inner rod.

[0010] As a further alternative, the fine-tuning component also includes a spring disposed within the cavity, the spring causing the pusher to tend toward the pushing ball.

[0011] As a further optional solution, the coarse adjustment assembly also includes a mounting sleeve threadedly connected to the coarse adjustment rotor, the mating ring being held between the coarse adjustment rotor and the mounting sleeve; the fine adjustment shaft is threadedly connected to the mounting sleeve.

[0012] As a further optional solution, the first end of the inner rod is provided with a first spherical abutment portion, and the inner rod abuts against the push block through the first spherical abutment portion; the second end of the inner rod is provided with a second spherical abutment portion.

[0013] As a further alternative, both the first spherical abutment and the second spherical abutment are steel balls embedded in the inner rod.

[0014] As a further alternative, an acute angle is formed between the cross-sections of the first mating surface and the second mating surface, and a plurality of pushing balls are arranged circumferentially.

[0015] As a further optional solution, the first end of the inner rod is provided with a slot, and the limiting member is a retaining spring disposed in the slot.

[0016] As a further optional solution, the fine-tuning assembly also includes a fine-tuning rotary seat, which is connected to the end of the fine-tuning shaft away from the mating ring; both the fine-tuning rotary seat and the coarse-tuning rotary seat are provided with friction patterns.

[0017] As a further optional solution, the fixing sleeve is provided with a fixing hole that is radially connected to the connecting hole, and a set screw is threaded into the fixing hole.

[0018] The actuator of the two-stage transmission structure of this application has at least the following advantages over the prior art:

[0019] The fine-tuning component in the actuator of this two-stage transmission structure can further decompose the axial movement of the fine-tuning shaft through the cooperation of the fine-tuning shaft, the mating ring, the pushing ball, and the push block, so that the adjustment accuracy of the fine-tuning component is higher. Attached Figure Description

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the actuator of a two-stage transmission structure according to an embodiment of the present invention;

[0022] Figure 2 This is an exploded view of an actuator with a two-stage transmission structure according to an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional schematic diagram of an actuator with a two-stage transmission structure according to an embodiment of the present invention;

[0024] Figure 4 This is a partial cross-sectional schematic diagram of an actuator with a two-stage transmission structure according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the push rod assembly.

[0026] In the diagram: 1. Fixing sleeve; 11. Fixing hole;

[0027] 2. Push rod assembly; 21. Inner rod; 211. Slot; 212. First spherical abutment part; 213. Second spherical abutment part; 22. Outer rod; 23. Limiting component;

[0028] 3. Coarse adjustment assembly; 31. Coarse adjustment rotary seat; 311. Cavity; 32. Mounting cylinder;

[0029] 4. Fine-tuning assembly; 41. Fine-tuning shaft; 411. Conical extrusion head; 412. Second mating surface; 42. Mating ring; 421. First mating surface; 43. Pushing ball; 44. Push block; 45. Spring; 46. Fine-tuning rotary seat. Detailed Implementation

[0030] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 utility model according to the specific circumstances.

[0033] refer to Figure 1-5 An embodiment of this utility model shows an actuator with a two-stage transmission structure, including a fixed sleeve 1, a push rod assembly 2, a coarse adjustment assembly 3, and a fine adjustment assembly 4;

[0034] The fixed sleeve 1 has a connecting hole (not marked in the figure); the push rod assembly 2 includes an inner rod 21 and an outer rod 22 sleeved on the inner rod 21. The outer rod 22 is threaded to the connecting hole of the fixed sleeve 1. The inner rod 21 is slidably disposed on the outer rod 22. Both ends of the inner rod 21 protrude from the outer rod 22. A limiting member 23 is provided on the first end of the inner rod 21; the coarse adjustment assembly 3 includes a coarse adjustment rotating seat 31, which is fixedly connected to one end of the outer rod 22; the coarse adjustment rotating seat 31 has a cavity 311 inside, and the first end of the inner rod 21 extends into the cavity 311; the fine adjustment assembly Component 4 includes a fine-tuning shaft 41, a mating ring 42, a plurality of pushing balls 43, and a push block 44 arranged sequentially. The mating ring 42 is fixedly disposed in the cavity 311. The inner hole of the mating ring 42 forms a conical first mating surface 421. The fine-tuning shaft 41 is threadedly connected to the coarse-tuning component 3. One end of the fine-tuning shaft 41 is provided with a conical extrusion head 411. The outer peripheral wall of the conical extrusion head 411 forms a conical second mating surface 412. The plurality of pushing balls 43 are disposed between the first mating surface 421 and the second mating surface 412. One end of the push block 44 abuts against the pushing balls 43, and the other end abuts against the inner rod 21.

[0035] Specifically, the fixed sleeve 1 is fixed in position, and the limiting member 23 prevents the inner rod 21 from disengaging from the outer rod 22 in a direction away from the coarse adjustment component 3. At the same time, the first end of the inner rod 21 is supported by the push block 44 in the fine adjustment component 4, so that the second end of the inner rod 21 can push the actuated member.

[0036] During coarse adjustment, the coarse adjustment rotating seat 31 is rotated, which drives the push rod assembly 2 and the fine adjustment assembly 4 to rotate as a whole. With the outer rod 22 connected to the fixed sleeve 1 by the thread, the outer rod 22 will move axially a certain distance when it rotates one revolution. The outer rod 22 and the inner rod 21 move synchronously to realize the position adjustment of the driven part.

[0037] When making fine adjustments, such as Figure 4 As shown, rotating the fine-tuning shaft 41 fixes the positions of the coarse-tuning assembly 3 and the outer rod 22. Assuming that when the fine-tuning shaft 41 rotates one revolution, the axial direction of the conical extrusion head 411 on the fine-tuning shaft 41 (i.e., ...) Figure 4 The vertical movement distance X1 is determined by the second mating surface 412 pressing the pushing ball 43, causing the pushing ball 43 to move laterally by a distance Y. The relationship between distance Y and distance X1 conforms to the Pythagorean theorem for right triangles. Therefore, the angle between the second mating surface 412 and the vertical direction determines the ratio between distance X1 and distance Y. When the pushing ball 43 moves laterally by a distance Y, guided by the first mating surface 421, the pushing ball 43 will move vertically by a distance X2. Similarly, the relationship between distance X2 and distance Y conforms to the Pythagorean theorem for right triangles. According to the Pythagorean theorem for right triangles, the angle between the first mating surface 421 and the horizontal plane determines the ratio between distance X2 and distance Y. Pushing the ball 43 to move vertically by a distance X2 will push the inner rod 21 through the push block 44, causing the inner rod 21 to move vertically by a distance X2. In other words, by setting the first mating surface 421 and the second mating surface 412, the distance X1 of the fine-tuning shaft 41 can be converted into a smaller distance X2, so that when the fine-tuning shaft 41 is rotated, the inner rod 21 can move a smaller distance, achieving more precise adjustment.

[0038] The first mating surface 421 and the second mating surface 412 form an acute angle between their cross-sections, and a plurality of pushing balls 43 are arranged circumferentially.

[0039] It should be noted that when the fine-tuning shaft 41 moves away from the inner rod 21, that is, the push block 44 does not push the inner rod 21, but under the reset of the actuated member, the actuated member will push the second end of the inner rod 21, so that the first end of the inner rod 21 always abuts against the push block 44; whereby the actuated member refers to the component to be actuated by the actuator of the secondary transmission structure, such as the moving stage in the loading device of publication number CN217561800U.

[0040] In some embodiments, such as Figure 4As shown, the fine-tuning component 4 also includes a spring 45 disposed within the cavity 311. The spring 45 causes the push block 44 to tend to move closer to the pushing ball 43. In this embodiment, the spring 45 can eliminate the threaded clearance between the fine-tuning shaft 41 and the coarse-tuning component 3, further reducing errors.

[0041] In some embodiments, to facilitate the installation of the mating ring 42, such as Figure 4 As shown, the coarse adjustment assembly 3 also includes a mounting cylinder 32, which is threadedly connected to the coarse adjustment rotating base 31. The mating ring 42 is clamped between the coarse adjustment rotating base 31 and the mounting cylinder 32. The fine adjustment shaft 41 is threadedly connected to the mounting cylinder 32. Specifically, one end of the mounting cylinder 32 presses against one end of the mating ring 42 to press the mating ring 42 tightly within the cavity 311. When it is necessary to assemble / disassemble the mating ring 42, the mounting cylinder 32 can be unscrewed, making the operation convenient.

[0042] In some embodiments, such as Figure 2 and Figure 4 As shown, the inner rod 21 has a first spherical abutment portion 212 at its first end, through which the inner rod 21 abuts against the push block 44; the inner rod 21 has a second spherical abutment portion 213 at its second end. Specifically, both the first spherical abutment portion 212 and the second spherical abutment portion 213 are steel balls embedded in the inner rod 21.

[0043] The pushing ball 43 is also a spherical steel ball. The frictional contact surface between the fine-tuning shaft 41 and the pushing ball 43 is small, so the rotation of the fine-tuning shaft 41 will not cause the pushing ball 43 to rotate circumferentially. Similarly, the frictional contact surface between the pushing ball 43 and the push block 44 is small, so the pushing ball 43 will not cause the push block 44 to rotate. Furthermore, the small frictional contact surface of the push block 44 via the first spherical abutment portion 212 ensures that the push block 44 will only cause the inner rod 21 to move axially, not rotate circumferentially. Additionally, the inner rod 21 contacts the actuated member via the second spherical abutment portion 213, and the small frictional contact surface between the second spherical abutment portion 213 and the actuated member will not cause the actuated member to rotate.

[0044] In some embodiments, to facilitate the setting of the limiting member 23, such as Figure 4 and Figure 5As shown, the first end of the inner rod 21 is provided with a slot 211, and the limiting member 23 is a retaining spring disposed in the slot 211. The retaining spring elastically latches in the slot 211, and the retaining spring can prevent the inner rod 21 from disengaging from the outer rod 22 in a direction away from the coarse adjustment component 3; at the same time, the retaining spring makes it easy to assemble / disassemble the inner rod 21 and the outer rod 22.

[0045] In some embodiments, such as Figure 3 As shown, the fine-tuning assembly 4 also includes a fine-tuning rotary seat 46, which is connected to the end of the fine-tuning shaft 41 away from the mating ring 42. Both the fine-tuning rotary seat 46 and the coarse-tuning rotary seat 31 are provided with friction patterns. Thus, the fine-tuning rotary seat 46 allows for easy manual rotation of the fine-tuning shaft 41, enabling fine-tuning without tools; the friction patterns prevent slippage when manually rotating the fine-tuning rotary seat 46 and the coarse-tuning rotary seat 31.

[0046] In some embodiments, such as Figure 1 As shown, the fixing sleeve 1 has a fixing hole 11 that is radially connected to the connecting hole (not marked in the figure), and a set screw (not shown) is threaded into the fixing hole 11. After the position of the outer rod 22 is adjusted, the set screw can be rotated so that the end of the set screw is pressed tightly against the outside of the outer rod 22, thereby achieving relative fixation between the outer rod 22 and the fixing sleeve 1.

[0047] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An actuator with a two-stage transmission structure, characterized in that, include: A fixing sleeve, wherein a connecting hole is provided inside the fixing sleeve; A push rod assembly includes an inner rod and an outer rod sleeved on the inner rod. The outer rod is threaded to the connecting hole of the fixed sleeve. The inner rod is slidably disposed on the outer rod. Both ends of the inner rod protrude beyond the outer rod. A limiting member is provided on the first end of the inner rod. A coarse adjustment assembly includes a coarse adjustment rotating seat, which is fixedly connected to one end of the outer rod; the coarse adjustment rotating seat has a cavity inside, and the first end of the inner rod extends into the cavity. The fine-tuning assembly includes a fine-tuning shaft, a mating ring, multiple push balls, and a push block arranged sequentially. The mating ring is fixedly disposed in the cavity, and the inner hole of the mating ring forms a tapered first mating surface. The fine-tuning shaft is threadedly connected to the coarse-tuning assembly. One end of the fine-tuning shaft is provided with a tapered extrusion head, and the outer peripheral wall of the tapered extrusion head forms a tapered second mating surface. The multiple push balls are disposed between the first and second mating surfaces. One end of the push block abuts against the push balls, and the other end abuts against the inner rod.

2. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The fine-tuning component also includes a spring disposed within the cavity, the spring causing the pusher to tend toward the pushing ball.

3. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The coarse adjustment assembly also includes a mounting sleeve threadedly connected to the coarse adjustment rotating seat, and the mating ring being held between the coarse adjustment rotating seat and the mounting sleeve; the fine adjustment shaft is threadedly connected to the mounting sleeve.

4. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The inner rod has a first spherical abutment at its first end, and the inner rod abuts against the push block through the first spherical abutment; the inner rod has a second spherical abutment at its second end.

5. The actuator of the two-stage transmission structure according to claim 4, characterized in that, Both the first spherical abutment and the second spherical abutment are steel balls embedded in the inner rod.

6. The actuator of the two-stage transmission structure according to claim 1, characterized in that, An acute angle is formed between the cross sections of the first mating surface and the second mating surface, and multiple pushing balls are arranged circumferentially.

7. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The first end of the inner rod is provided with a slot, and the limiting member is a retaining spring disposed in the slot.

8. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The fine-tuning assembly also includes a fine-tuning rotary seat, which is connected to the end of the fine-tuning shaft away from the mating ring; both the fine-tuning rotary seat and the coarse-tuning rotary seat are provided with friction patterns.

9. The actuator of the two-stage transmission structure according to claim 1, characterized in that, The fixing sleeve is provided with a fixing hole that is radially connected to the connecting hole, and a set screw is threaded into the fixing hole.

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