Large-stroke bridge type amplifying mechanism

Abstract

The utility model provides a large-stroke bridge type amplifying mechanism, and relates to the technical field of precise driving and transmission. Four lever mechanisms; two Z-shaped amplification mechanisms; four rigid connecting blocks; and four second Z-shaped flexible hinges. The four-lever mechanism is driven by the driver to move, and input displacement is amplified once; each lever mechanism drives a second Z-shaped flexible hinge to move, and the input displacement is amplified for the second time; every two second Z-shaped flexible hinges drive one Z-shaped amplification mechanism to move, and input displacement is amplified for three times. The utility model has the beneficial effects that the lever mechanism, the Z-shaped amplification mechanism and the bridge type mechanism are combined, so that the amplification performance of the bridge type mechanism is greatly improved, and the bridge type mechanism adapts to application scenes requiring large-stroke motion; the displacement direction can be changed, and the application scene needing displacement change can be better met.

Description

Technical Field

[0001] This utility model relates to the field of precision drive and transmission technology, and in particular to a large-stroke bridge amplification mechanism. Background Technology

[0002] In recent years, micro-nano manipulation technology has developed rapidly, and its applications in micro-nano fabrication and assembly, microelectromechanical systems (MEMS), precision optics, and biomedical science have become increasingly widespread. However, rigid structures, due to friction and gaps, can no longer meet the needs of micro-nano manipulation. Flexible mechanisms, which mainly utilize the deformation of flexible hinges to transmit motion and force, have advantages such as frictionless operation, gapless operation, high precision, and light weight, and are gradually becoming the core components of micro-nano manipulation.

[0003] Due to the limited stroke of the actuator, research on amplification mechanisms is constantly deepening to meet practical needs. The bridge amplification mechanism, as a typical compliant amplification mechanism, can achieve a large amplification ratio with a relatively small size. For example... Figure 1 and 2 As shown, the output stage of a traditional bridge amplifier consists of a pair of compliant blade hinges and an output rigid block. Since the two compliant hinges are at the same horizontal position, the output displacement of the rigid block is only affected by the hinge displacement and not by the force, thus limiting the amplification performance of the input displacement. Utility Model Content

[0004] In view of this, in order to improve the amplification performance of the bridge mechanism, the embodiments of this utility model provide a large-stroke bridge amplification mechanism.

[0005] An embodiment of this utility model provides a long-stroke bridge amplification mechanism, comprising:

[0006] drive;

[0007] Four lever mechanisms are arranged symmetrically in pairs. Each end of the driver is connected to the input end of two of the lever mechanisms, and the two lever mechanisms connected to each end of the driver are symmetrical vertically.

[0008] Two Z-shaped amplification mechanisms are symmetrically arranged above and below the driver. Each Z-shaped amplification mechanism includes a rigid output block and two first Z-shaped compliant hinges. One end of each of the two first Z-shaped compliant hinges is connected to both ends of the rigid output block.

[0009] Four rigid connecting blocks, with the other ends of the two first Z-shaped compliant hinges of each Z-shaped amplification mechanism respectively connecting one end of each of the rigid connecting blocks;

[0010] And four second Z-shaped compliant hinges, each of the second Z-shaped compliant hinges having one end connected to the output end of the lever mechanism and the other end connected to the other end of the rigid connecting block;

[0011] The driver can drive the four lever mechanisms to move, amplifying the input displacement once; each lever mechanism drives a second Z-shaped compliant hinge to move, amplifying the input displacement a second time; and every two second Z-shaped compliant hinges drive a Z-shaped amplification mechanism to move, amplifying the input displacement a third time.

[0012] Furthermore, the lever mechanism includes a lever and a rotating block. The two ends of the lever are respectively connected to one end of the driver and one end of the second Z-shaped compliant hinge. The rotating block is fixed to one side of the lever to form the fulcrum of the lever mechanism.

[0013] Furthermore, the distance from the rotating block to the second Z-shaped compliant hinge is greater than the distance from the rotating block to the driver.

[0014] Furthermore, the rotating block is provided with fixing holes.

[0015] Furthermore, the two first Z-shaped compliant hinges of each of the Z-shaped amplification mechanisms are symmetrical from left to right.

[0016] Furthermore, the two rigid connecting blocks connected by the two first Z-shaped compliant hinges of each Z-shaped amplification mechanism are arranged symmetrically on the left and right.

[0017] Furthermore, one end of the second Z-shaped compliant hinge is perpendicularly connected to the output end of the lever mechanism, and the other end is perpendicularly connected to the side of the rigid connecting block.

[0018] Furthermore, the first Z-shaped compliant hinge and the second Z-shaped compliant hinge connected to each of the rigid connecting blocks are staggered in the vertical direction.

[0019] Furthermore, the bridge-type amplification mechanism is symmetrical both vertically and horizontally.

[0020] Furthermore, the actuator is a piezoelectric ceramic actuator.

[0021] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows:

[0022] 1. This utility model discloses a large-stroke bridge amplification mechanism, which drives a four-lever mechanism to amplify the input displacement once through a driver; each lever mechanism drives a second Z-shaped compliant hinge to amplify the input displacement a second time; every two second Z-shaped compliant hinges drive a Z-shaped amplification mechanism to amplify the input displacement a third time. By combining the lever mechanism, the Z-shaped amplification mechanism and the bridge mechanism, the amplification performance of the bridge mechanism is greatly improved, making it suitable for application scenarios that require large-stroke motion.

[0023] 2. The present invention provides a large-stroke bridge amplification mechanism, in which the driver outputs horizontal displacement and the rigid output block outputs vertical displacement, thereby changing the displacement direction and better meeting the application scenarios requiring displacement changes. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a traditional bridge amplification mechanism in the background art;

[0025] Figure 2 This is a schematic diagram of the output end of a traditional bridge amplification mechanism in the background art;

[0026] Figure 3 This is a front view of a large-stroke bridge-type magnification mechanism of this utility model;

[0027] Figure 4 This is a perspective view of a large-stroke bridge-type amplification mechanism according to this utility model;

[0028] Figure 5 This is a schematic diagram of the motion of the Z-type amplification mechanism;

[0029] Figure 6 yes Figure 3 A schematic diagram of the motion at point A in the middle;

[0030] Figure 7 yes Figure 1 A schematic diagram of the single-sided motion of a traditional bridge amplification mechanism.

[0031] In the diagram: 1. Driver; 2. Lever mechanism; 3. Z-type amplification mechanism; 4. Rigid connecting block; 5. Second Z-type compliant hinge; 6. Rigid output block; 7. First Z-type compliant hinge; 8. Lever; 9. Rotating block. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0036] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Please refer to Figure 3 and 4 The present invention provides a large-stroke bridge amplification mechanism, which mainly includes a driver 1, four lever mechanisms 2, two Z-shaped amplification mechanisms 3, four rigid connecting blocks 4, and four second Z-shaped compliant hinges 5.

[0038] The actuator 1 is arranged horizontally, and both ends of the actuator 1 can output displacement horizontally. The actuator 1 is generally selected as a bidirectional linear actuator 1, such as in this embodiment, the actuator 1 is a piezoelectric ceramic actuator 1.

[0039] The lever mechanisms 2 described above are symmetrical in pairs, and each end of the driver 1 is connected to the input end of two lever mechanisms 2. The two lever mechanisms 2 connected to each end of the driver 1 are also symmetrical vertically. Each end of the driver 1 can simultaneously drive the two lever mechanisms 2 connected to it to move synchronously. The output displacement of the driver 1 is initially amplified by the two lever mechanisms 2, forming a primary amplification.

[0040] The two Z-shaped amplification mechanisms 3 are symmetrically arranged vertically relative to the driver 1, with each Z-shaped amplification mechanism 3 located between the two lever mechanisms 2 that are positioned to the left and right. Each Z-shaped amplification mechanism 3 includes a rigid output block 6 and two first Z-shaped compliant hinges 7, with one end of each of the two first Z-shaped compliant hinges 7 connected to both ends of the rigid output block 6.

[0041] The other ends of the two first Z-shaped compliant hinges 7 of each Z-shaped amplification mechanism 3 are respectively connected to one end of the two rigid connecting blocks 4; one end of each second Z-shaped compliant hinge 5 is connected to the output end of the lever mechanism 2, and the other end is connected to the other end of the rigid connecting block 4.

[0042] The driver 1 can drive the four lever mechanisms 2 to move, amplifying the input displacement once; each lever mechanism 2 drives a second Z-shaped compliant hinge 5 to move, amplifying the input displacement a second time; every two second Z-shaped compliant hinges 5 drive a Z-shaped amplification mechanism 3 to move, amplifying the input displacement a third time.

[0043] In some embodiments, the lever mechanism 2 includes a lever 8 and a rotating block 9. The two ends of the lever 8 are respectively connected to one end of the driver 1 and one end of the second Z-shaped compliant hinge 5. The rotating block 9 is fixed to one side of the lever 8 to form the fulcrum of the lever mechanism 2.

[0044] In order to make the displacement output by the lever mechanism 2 more significantly amplified by the driver 1, the distance from the rotating block 9 to the second Z-shaped compliant hinge 5 is greater than the distance from the rotating block 9 to the driver 1.

[0045] To address the installation and fixation of the rotating block 9, a fixing hole is provided on the rotating block 9. This fixing hole can be a screw hole, allowing the rotating block 9 to be fixed with screws, thus enabling it to rotate and form a fulcrum, while simultaneously securing the entire bridge amplification mechanism.

[0046] like Figure 5 As shown, when the two first Z-shaped compliant hinges 7 of the Z-shaped amplification mechanism 3 are subjected to equal and opposite horizontal forces, the rigid output block 6 can generate a vertical output displacement. The displacement of the rigid output block 6 is caused by the deformation displacement of the two first Z-shaped compliant hinges 7 and the combined effect of the force transmitted to the rigid output block 6, thus greatly improving the amplification performance. To ensure that the displacement output by the rigid output block 6 of the Z-shaped amplification mechanism 3 is accurately maintained in the vertical direction, the two first Z-shaped compliant hinges 7 of each Z-shaped amplification mechanism 3 are symmetrical from left to right.

[0047] Furthermore, to ensure that equal and opposite horizontal forces are stably transmitted to the Z-shaped amplification mechanism 3, the two rigid connecting blocks 4 connected by the two first Z-shaped compliant hinges 7 of each Z-shaped amplification mechanism 3 are arranged symmetrically on the left and right. One end of the second Z-shaped compliant hinge 5 is perpendicularly connected to the output end of the lever mechanism 2, and the other end is perpendicularly connected to the side of the rigid connecting block 4.

[0048] Furthermore, to achieve a more pronounced amplification effect for the second Z-shaped compliant hinge 5, the first Z-shaped compliant hinge 7 and the second Z-shaped compliant hinge 5 connected to each of the rigid connecting blocks 4 are vertically offset. In this embodiment, the connection points of the first Z-shaped compliant hinge 7 and the second Z-shaped compliant hinge 5 with the rigid connecting block 4 are located on the same horizontal line. The first Z-shaped compliant hinge 7 is located between the rigid connecting block 4 and the rigid output block 6, closer to the driver 1, while the second Z-shaped compliant hinge 5 is located between the rigid connecting block 4 and the output end of the lever mechanism 2, farther from the driver 1. Figure 6 As shown, after the displacement is input to the second Z-shaped compliant hinge 5, the first Z-shaped compliant hinge 7 and the second Z-shaped compliant hinge 5 have a height difference, and thus deform respectively, and... Figure 7 Compared to the unilateral movement of the traditional bridge-type amplification mechanism shown, the deformation of both the first Z-type compliant hinge 7 and the second Z-type compliant hinge 5 produces an amplification effect, thus generating greater amplification capability in the vertical direction.

[0049] As a preferred technical solution, the embodiment of this utility model provides a long-stroke bridge amplification mechanism that is symmetrical both vertically and horizontally, so that when the driver 1 drives the bridge amplification mechanism to work, the two rigid output blocks 6 move symmetrically and stably.

[0050] The working process of the large-stroke bridge amplification mechanism of this utility model is as follows:

[0051] First, the rotating block 9 of the fourth lever mechanism 2 is fixed, thus fixing the entire bridge amplification mechanism. Then, the four lever mechanisms 2 are driven to move through both ends of the driver 1. The two ends of the driver 1 respectively input displacement to the four lever mechanisms 2. The input displacement is amplified once by the movement of the four lever mechanisms 2. The amplified displacement is then input to the four second Z-shaped compliant hinges 5. Each second Z-shaped compliant hinge 5 deforms to generate displacement, amplifying the input displacement a second time. Every two second Z-shaped compliant hinges 5 drive one Z-shaped amplification mechanism 3 to move. The amplified input displacement is transmitted to the Z-shaped amplification mechanism 3 through the two second Z-shaped compliant hinges 5 at both ends of the Z-shaped amplification mechanism 3. The combined effect of the displacement generated by the deformation of the two second Z-shaped compliant hinges 5 and the force transmitted to the rigid output block 6 causes the rigid output block 6 to move vertically, amplifying the input displacement a third time.

[0052] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0053] Where there is no conflict, the embodiments and features described above can be combined with each other. 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. A large-stroke bridge amplification mechanism characterized by, include: drive; Four lever mechanisms are arranged symmetrically in pairs. Each end of the driver is connected to the input end of two of the lever mechanisms, and the two lever mechanisms connected to each end of the driver are symmetrical vertically. Two Z-shaped amplification mechanisms are symmetrically arranged above and below the driver. Each Z-shaped amplification mechanism includes a rigid output block and two first Z-shaped compliant hinges. One end of each of the two first Z-shaped compliant hinges is connected to both ends of the rigid output block. Four rigid connecting blocks, with the other ends of the two first Z-shaped compliant hinges of each Z-shaped amplification mechanism respectively connecting one end of each of the rigid connecting blocks; And four second Z-shaped compliant hinges, each of the second Z-shaped compliant hinges having one end connected to the output end of the lever mechanism and the other end connected to the other end of the rigid connecting block; The driver can drive the four lever mechanisms to move, amplifying the input displacement once; each lever mechanism drives a second Z-shaped compliant hinge to move, amplifying the input displacement a second time; and every two second Z-shaped compliant hinges drive a Z-shaped amplification mechanism to move, amplifying the input displacement a third time.

2. A long-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The lever mechanism includes a lever and a rotating block. The two ends of the lever are respectively connected to one end of the driver and one end of the second Z-shaped compliant hinge. The rotating block is fixed to one side of the lever to form the fulcrum of the lever mechanism.

3. A long-stroke bridge amplification mechanism as claimed in claim 2, characterized in that: The distance from the rotating block to the second Z-shaped compliant hinge is greater than the distance from the rotating block to the driver.

4. A long-stroke bridge amplification mechanism as claimed in claim 2, characterized in that: The rotating block is provided with fixing holes.

5. A long-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The two first Z-type compliant hinges of each of the Z-type amplification mechanisms are symmetrical.

6. A long-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The two rigid connecting blocks connected by the first Z-shaped compliant hinges of each Z-shaped amplification mechanism are arranged symmetrically on the left and right.

7. A long-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: One end of the second Z-shaped compliant hinge is perpendicularly connected to the output end of the lever mechanism, and the other end is perpendicularly connected to the side of the rigid connecting block.

8. A long-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The first Z-shaped compliant hinge and the second Z-shaped compliant hinge connected to each of the rigid connecting blocks are offset in the vertical direction.

9. A large-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The bridge-type amplification mechanism is symmetrical both vertically and horizontally.

10. A large-stroke bridge amplification mechanism as claimed in claim 1, characterized in that: The actuator is a piezoelectric ceramic actuator.

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