Piezoelectric stack actuation device

Abstract

The utility model belongs to the technical field of piezoelectric stacks, and discloses a piezoelectric stack actuating device, which comprises a first piezoelectric stack, a second piezoelectric stack, a fixed seat, an amplification plate, a first limiting piece and a second limiting piece, and is characterized in that the first piezoelectric stack and the second piezoelectric stack are arranged in parallel and are both arranged between the fixed seat and the amplification plate; one end of the first piezoelectric stack and one end of the second piezoelectric stack are both connected with the fixing base, the other end of the first piezoelectric stack and the other end of the second piezoelectric stack both abut against the amplification plate, and the first limiting piece is configured to limit the first piezoelectric stack to move in the first direction. The first direction is the arrangement direction of the first piezoelectric stack and the second piezoelectric stack, and the second limiting piece is configured to limit the second piezoelectric stack to move along the first direction, so that the first piezoelectric stack and the second piezoelectric stack do not move along the arrangement direction of the first piezoelectric stack and the second piezoelectric stack; therefore, the first piezoelectric stack and the second piezoelectric stack can work continuously and normally.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric stack technology, and in particular to a piezoelectric stack actuation device. Background Technology

[0002] Piezoelectric actuators, as a novel type of drive device, offer advantages such as high precision and fast response. In existing technologies, piezoelectric stack actuators generally include a fixed base, an amplification plate, and two piezoelectric stacks. To ensure stability in output position and magnitude, the two piezoelectric stacks are arranged in parallel. Furthermore, one end of each piezoelectric stack is fixedly connected to the fixed base, while the other end presses against the amplification plate. The width of the amplification plate along the arrangement direction of the two piezoelectric stacks gradually decreases from the side closer to the two piezoelectric stacks to the side farther away.

[0003] As described above, when a voltage is applied to the piezoelectric stack, it can expand along its axial direction, thereby outputting displacement along its axial direction. In the prior art, by applying different voltages to the two piezoelectric stacks, it is possible to control the two piezoelectric stacks to output different displacements along their respective axial directions. This causes the side of the amplification board closest to the two piezoelectric stacks to deflect. Under the amplification effect of the amplification board, this deflection causes the side of the amplification board away from the two piezoelectric stacks to displace along the arrangement direction of the two piezoelectric stacks. In other words, the prior art can output displacement along the arrangement direction of the two piezoelectric stacks on the side of the amplification board away from the two piezoelectric stacks by applying different voltages to the two piezoelectric stacks.

[0004] When the applied voltage is stopped, the piezoelectric stack recovers its deformation, and the amplifier board resets. Because the two piezoelectric stacks expand to different degrees along their respective axes, their recovery speeds differ. The piezoelectric stack with a larger axial expansion recovers its deformation more slowly. Therefore, during the reset process on the side of the amplifier board closest to the two piezoelectric stacks from a deflected state, the portion of the amplifier board closer to the larger-expanded piezoelectric stack resets more slowly, while the portion closer to the smaller-expanded piezoelectric stack resets more quickly. This results in pressure being applied to the larger-expanded piezoelectric stack during the reset process. Since the amplifier board resets from a deflected state, the pressure applied to the larger-expanded piezoelectric stack not only generates an axial component force along its axis but also a longitudinal component force along the alignment direction of the two piezoelectric stacks. This longitudinal component force causes the larger-expanded piezoelectric stack to shift along the alignment direction of the two piezoelectric stacks, thus affecting its subsequent normal use. Utility Model Content

[0005] The purpose of this invention is to provide a piezoelectric stack actuation device to prevent the piezoelectric stack from shifting in the arrangement direction of the two piezoelectric stacks, thereby avoiding affecting the normal use of the piezoelectric stack.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a piezoelectric stack actuation device, including a first piezoelectric stack, a second piezoelectric stack, a fixed base, and an amplifying plate. The first piezoelectric stack and the second piezoelectric stack are arranged in parallel and are both installed between the fixed base and the amplifying plate. One end of the first piezoelectric stack and one end of the second piezoelectric stack are both connected to the fixed base, and the other ends of the first piezoelectric stack and the second piezoelectric stack abut against the amplifying plate. The piezoelectric stack actuation device further includes:

[0008] A first limiting member is configured to restrict the first piezoelectric stack from shifting along a first direction, the first direction being the arrangement direction of the first piezoelectric stack and the second piezoelectric stack;

[0009] The second limiting element is configured to restrict the displacement of the second piezoelectric stack along the first direction.

[0010] Preferably, the first limiting member and the second limiting member are both fixedly connected to the amplifying plate. The first limiting member is provided with a first limiting groove. The end of the first piezoelectric stack away from the fixed base extends into the first limiting groove. The first limiting groove is formed with a first groove wall and a second groove wall. The first groove wall and the second groove wall are arranged opposite to each other along the first direction. The part of the first piezoelectric stack that extends into the first limiting groove is located between the first groove wall and the second groove wall.

[0011] The second limiting member is provided with a second limiting groove. One end of the second piezoelectric stack away from the fixed base extends into the second limiting groove. The second limiting groove is formed with a third groove wall and a fourth groove wall. The third groove wall and the fourth groove wall are arranged opposite to each other along the first direction. The part of the second piezoelectric stack that extends into the second limiting groove is located between the third groove wall and the fourth groove wall.

[0012] Preferably, the first limiting groove extends through the first limiting member along the second direction, and the second direction is perpendicular to both the first direction and the extension direction of the first piezoelectric stack. There are gaps between the first piezoelectric stack and the first groove wall, as well as between the first piezoelectric stack and the second groove wall.

[0013] The second limiting groove extends through the second limiting member along the second direction, and there are gaps between the second piezoelectric stack and the third groove wall, as well as between the second piezoelectric stack and the fourth groove wall.

[0014] Preferably, the first limiting member has a first arc-shaped protrusion on the side of the fixed seat along the extension direction of the first piezoelectric stack. The first arc-shaped protrusion is disposed in the first limiting groove and protrudes from the side away from the fixed seat to the side close to the fixed seat along the extension direction of the first piezoelectric stack. The first piezoelectric stack abuts against the top of the first arc-shaped protrusion.

[0015] The second limiting member has a second arc-shaped protrusion on one side of the fixed base along the extension direction of the second piezoelectric stack. The second arc-shaped protrusion is disposed in the second limiting groove and protrudes from the side away from the fixed base to the side close to the fixed base along the extension direction of the second piezoelectric stack. The second piezoelectric stack abuts against the top of the second arc-shaped protrusion.

[0016] Preferably, both the first limiting member and the second limiting member are made of wear-resistant alloy material.

[0017] Preferably, the first limiting member is a first pin, which is disposed on the side of the amplifying plate facing the fixed base along the extension direction of the first piezoelectric stack and extends along the second direction. The second direction is perpendicular to both the first direction and the extension direction of the first piezoelectric stack. A first slot is provided at the end of the first piezoelectric stack away from the fixed base. The first slot extends along the second direction, and the first pin is embedded in the first slot.

[0018] The second limiting member is a second pin. The second pin is disposed on the side of the amplification plate facing the fixed base along the extension direction of the first piezoelectric stack and extends along the second direction. A second slot is provided at the end of the first piezoelectric stack away from the fixed base. The second slot extends along the second direction, and the second pin is embedded in the second slot.

[0019] Preferably, the amplification plate is provided with a third slot on one side of the fixed base along the extension direction of the first piezoelectric stack. The third slot extends along the second direction. The first pin is embedded in the third slot, and a portion of the first pin extends out of the third slot along its radial direction. The first pin and the slot wall of the third slot are in clearance fit, and the clearance is filled with structural adhesive.

[0020] The amplification board has a fourth slot on one side of the fixed base along the extension direction of the second piezoelectric stack. The fourth slot extends along the second direction. The second pin is embedded in the fourth slot, and a portion of the second pin extends out of the fourth slot along its radial direction. The second pin and the slot wall of the fourth slot are in clearance fit, and the clearance is filled with structural adhesive.

[0021] Preferably, both the first pin and the second pin are made of wear-resistant alloy material.

[0022] Preferably, a first connecting plate is provided at the end of the first piezoelectric stack away from the fixed base, and a second connecting plate is provided at the end of the second piezoelectric stack away from the fixed base, with the first connecting plate and the second connecting plate pressing against the amplification plate.

[0023] Preferably, the first connecting plate is bonded to the first piezoelectric stack using structural adhesive, and the second connecting plate is bonded to the second piezoelectric stack using structural adhesive.

[0024] The beneficial effects of this utility model are:

[0025] In this invention, when the applied voltage is stopped, the first and second piezoelectric stacks recover their deformation, and the amplification board resets. During the resetting process of the amplification board, even if the amplification board applies pressure consisting of axial and longitudinal components to the first or second piezoelectric stack, the first piezoelectric stack is limited by the first limiting member, and the second piezoelectric stack is limited by the second limiting member. Therefore, neither the first nor the second piezoelectric stack will shift along their arrangement direction, thus ensuring that the first and second piezoelectric stacks can continue to work normally. Attached Figure Description

[0026] Figure 1 This is one of the structural schematic diagrams of the piezoelectric stacked actuation device in Embodiment 1 of this utility model;

[0027] Figure 2 This is the second schematic diagram of the piezoelectric stacked actuator in Embodiment 1 of this utility model;

[0028] Figure 3 This is the third schematic diagram of the piezoelectric stacked actuator in Embodiment 1 of this utility model;

[0029] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0030] Figure 5 This is one of the exploded views of the piezoelectric stacked actuator in Embodiment 1 of this utility model;

[0031] Figure 6This is the second exploded view of the piezoelectric stacked actuator in Embodiment 1 of this utility model;

[0032] Figure 7 This is one of the structural schematic diagrams of the piezoelectric stacked actuation device in Embodiment 2 of this utility model;

[0033] Figure 8 This is the second schematic diagram of the piezoelectric stacked actuator in Embodiment 2 of this utility model;

[0034] Figure 9 This is the third schematic diagram of the piezoelectric stacked actuator in Embodiment 2 of this utility model;

[0035] Figure 10 This is one of the exploded views of the piezoelectric stacked actuation device in Embodiment 2 of this utility model;

[0036] Figure 11 This is the second exploded view of the piezoelectric stacked actuation device in Embodiment 2 of this utility model.

[0037] In the picture:

[0038] 1. First piezoelectric stack; 11. First connecting plate; 111. First slot; 2. Second piezoelectric stack; 21. Second connecting plate; 211. Second slot; 3. Fixing base; 4. Amplifying board; 41. Third slot; 42. Fourth slot; 5. Limiting seat; 51. First limiting component; 511. First limiting groove; 5111. First groove wall; 5112. Second groove wall; 512. First arc-shaped protrusion; 52. Second limiting component; 521. Second limiting groove; 5211. Third groove wall; 5212. Fourth groove wall; 522. Second arc-shaped protrusion; 61. First ball head; 62. Second ball head; 71. First pre-tightening bolt; 72. Second pre-tightening bolt. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] Example 1

[0044] Please see Figures 1 to 6 This embodiment provides a piezoelectric stack actuation device. Similar to the prior art, the piezoelectric stack actuation device includes two piezoelectric stacks, namely a first piezoelectric stack 1 and a second piezoelectric stack 2. In addition to the two piezoelectric stacks, the piezoelectric stack actuation device also includes a fixed base 3 and an amplification mechanism. The amplification mechanism includes an amplification plate 4. The first piezoelectric stack 1 and the second piezoelectric stack 2 are arranged in parallel and are both installed between the fixed base 3 and the amplification plate 4. One end of the first piezoelectric stack 1 and one end of the second piezoelectric stack 2 are both connected to the fixed base 3. Specifically, a first ball head 61 and a second ball head 62 are respectively fixedly connected to one end of the first piezoelectric stack 1 and one end of the second piezoelectric stack 2. The end of the first ball head 61 away from the first piezoelectric stack 1 and the end of the second ball head 62 away from the second piezoelectric stack 2 are both connected to the fixed base 3. The other end of the first piezoelectric stack 1 and the other end of the second piezoelectric stack 2 abut against the amplification plate 4.

[0045] During operation, different voltages are applied to the first piezoelectric stack 1 and the second piezoelectric stack 2, thereby controlling the first piezoelectric stack 1 and the second piezoelectric stack 2 to output different displacements along their respective axes. For example, in this embodiment, the voltage applied to the first piezoelectric stack 1 is greater than the voltage applied to the second piezoelectric stack 2. Therefore, the displacement output by the first piezoelectric stack 1 along its axis is greater than the displacement output by the second piezoelectric stack 2 along its axis. This causes the side of the amplifying plate 4 closest to the first piezoelectric stack 1 and the second piezoelectric stack 2 to deflect. Specifically, taking the first piezoelectric stack 1 and the second piezoelectric stack 2 arranged vertically as an example, the side of the amplifying plate 4 closest to the first piezoelectric stack 1 and the second piezoelectric stack 2 can deflect downwards. Under the action of the amplification mechanism, the side of the amplifying plate 4 furthest from the first piezoelectric stack 1 and the second piezoelectric stack 2 can move downwards in the vertical direction.

[0046] It is understood that the mounting base 3 and the amplification plate 4 are connected by the first pre-tightening bolt 71 and the second pre-tightening bolt 72. The axial direction of the first pre-tightening bolt 71 and the axial direction of the second pre-tightening bolt 72 are both parallel to the axial direction of the two piezoelectric stacks. The first pre-tightening bolt 71 and the second pre-tightening bolt 72 provide a certain pre-tightening force for the mounting base 3, the first piezoelectric stack 1, the second piezoelectric stack 2 and the amplification plate 4, thereby ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 are stably installed between the mounting base 3 and the amplification plate 4, and ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 can be stably actuated.

[0047] Compared to the prior art, the piezoelectric stack actuation device in this embodiment further includes a first limiting member 51 and a second limiting member 52. The first limiting member 51 is configured to restrict the first piezoelectric stack 1 from shifting along a first direction, which is the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2. In this embodiment, the first direction is the vertical direction. The second limiting member 52 is configured to restrict the second piezoelectric stack 2 from shifting along the first direction.

[0048] Therefore, when the applied voltage is stopped, the first piezoelectric stack 1 and the second piezoelectric stack 2 return to their original deformation, and the amplification board 4 resets. During the reset process of the amplification board 4, even if the amplification board 4 applies pressure consisting of axial and longitudinal components to the first piezoelectric stack 1 or the second piezoelectric stack 2, the first piezoelectric stack 1 is limited by the first limiting member 51, and the second piezoelectric stack 2 is limited by the second limiting member 52. Therefore, neither the first piezoelectric stack 1 nor the second piezoelectric stack 2 will shift along their arrangement direction, thus ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 can continue to work normally.

[0049] Specifically, in this embodiment, both the first piezoelectric stack 1 and the second piezoelectric stack 2 extend horizontally and can expand horizontally. The first piezoelectric stack 1 and the second piezoelectric stack 2 are arranged vertically. During the resetting process of the amplification plate 4, the amplification plate 4 applies pressure composed of axial force and longitudinal force to the first piezoelectric stack 1 or the second piezoelectric stack 2. The axial force is a horizontal force, and the longitudinal force is a vertical force. The first limiting member 51 restricts the first piezoelectric stack 1 from moving vertically, and the second limiting member 52 restricts the second piezoelectric stack 2 from moving vertically, thereby ensuring that neither the first piezoelectric stack 1 nor the second piezoelectric stack 2 will move vertically, thus ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 can continue to work normally.

[0050] Based on the foregoing description, in this embodiment, the first limiting member 51 is fixedly connected to the amplifying plate 4. The first limiting member 51 is provided with a first limiting groove 511. One end of the first piezoelectric stack 1 away from the fixing base 3 extends into the first limiting groove 511. The first limiting groove 511 is formed with a first groove wall 5111 and a second groove wall 5112. The first groove wall 5111 and the second groove wall 5112 are arranged opposite to each other along a first direction. The portion of the first piezoelectric stack 1 extending into the first limiting groove 511 is located between the first groove wall 5111 and the second groove wall 5112. The first groove wall 5111 and the second groove wall 5112 limit the portion of the first piezoelectric stack 1 that extends into the first limiting groove 511. Since the force-bearing position on the first piezoelectric stack 1 is the part where the first piezoelectric stack 1 contacts the amplification board 4, the first groove wall 5111 and the second groove wall 5112 limit the portion of the first piezoelectric stack 1 that extends into the first limiting groove 511. This limits the portion of the first piezoelectric stack 1 that is adjacent to the force-bearing position, thereby ensuring that the first piezoelectric stack 1 will not shift along the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0051] It is worth noting that a first connecting plate 11 is provided at the end of the first piezoelectric stack 1 away from the fixed base 3. The first connecting plate 11 presses against the amplification plate 4. That is, in this embodiment, the first piezoelectric stack 1 presses against the amplification plate 4 through the first connecting plate 11, thereby avoiding damage to the first piezoelectric stack 1.

[0052] Therefore, in this embodiment, the first connecting plate 11 extends into the first limiting groove 511, and the first limiting member 51 is used to limit the first connecting plate 11, thereby preventing the first piezoelectric stack 1 from shifting in the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0053] Additionally, the second limiting member 52 is also fixedly connected to the amplifying plate 4. The second limiting member 52 is provided with a second limiting groove 521. The end of the second piezoelectric stack 2 away from the fixed base 3 extends into the second limiting groove 521. The second limiting groove 521 forms a third groove wall 5211 and a fourth groove wall 5212. The third groove wall 5211 and the fourth groove wall 5212 are arranged opposite to each other along the first direction. The part of the second piezoelectric stack 2 that extends into the second limiting groove 521 is located between the third groove wall 5211 and the fourth groove wall 5212. The groove wall 5212 limits the portion of the second piezoelectric stack 2 that extends into the second limiting groove 521. Since the force-bearing position on the second piezoelectric stack 2 is the part where the second piezoelectric stack 2 contacts the amplification plate 4, the third groove wall 5211 and the fourth groove wall 5212 limit the portion of the second piezoelectric stack 2 that extends into the second limiting groove 521. This limits the portion of the second piezoelectric stack 2 adjacent to the force-bearing position, thereby ensuring that the second piezoelectric stack 2 will not shift along the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0054] Correspondingly, a second connecting plate 21 is provided at the end of the second piezoelectric stack 2 away from the fixed base 3. The second connecting plate 21 presses against the amplification plate 4. That is, in this embodiment, the second piezoelectric stack 2 presses against the amplification plate 4 through the second connecting plate 21, thereby avoiding damage to the second piezoelectric stack 2.

[0055] Therefore, in this embodiment, the second connecting plate 21 extends into the second limiting groove 521, and the second limiting member 52 is used to limit the second connecting plate 21, thereby preventing the second piezoelectric stack 2 from shifting in the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0056] It is also worth noting that in this embodiment, the first limiting member 51 and the second limiting member 52 are integrally formed into a limiting seat 5, and the first limiting groove 511 and the second limiting groove 521 are both formed on the limiting seat 5. Of course, in other optional embodiments, the first limiting member 51 and the second limiting member 52 can also be two independent components. This embodiment does not impose specific restrictions on this.

[0057] Based on the foregoing, in this embodiment, the first connecting plate 11 is bonded to the first piezoelectric stack 1 with structural adhesive, the second connecting plate 21 is bonded to the second piezoelectric stack 2 with structural adhesive, the limiting seat 5 is bonded to the amplifying plate 4 with structural adhesive, the first ball head 61 is bonded to the first piezoelectric stack 1 with structural adhesive, the second ball head 62 is bonded to the second piezoelectric stack 2 with structural adhesive, and both the first ball head 61 and the second ball head 62 are bonded to the fixing seat 3 with structural adhesive. This further ensures that the first piezoelectric stack 1 and the second piezoelectric stack 2 are securely installed between the fixing seat 3 and the amplifying plate 4, and further ensures that the first piezoelectric stack 1 and the second piezoelectric stack 2 can be stably actuated.

[0058] Furthermore, in this embodiment, the first limiting groove 511 penetrates the first limiting member 51 along the second direction. The second direction is perpendicular to both the first direction and the extension direction of the first piezoelectric stack 1. There are gaps between the first piezoelectric stack 1 and the first groove wall 5111, as well as between the first piezoelectric stack 1 and the second groove wall 5112. This ensures that during the axial expansion of the first piezoelectric stack 1, only the end face of the first connecting plate 11 along the extension direction of the first piezoelectric stack 1 contacts the limiting seat 5, while the sides of the first connecting plate 11 along the first direction do not contact the limiting seat 5. This avoids the friction between the first connecting plate 11 and the limiting seat 5 from affecting the actuation of the first piezoelectric stack 1. Moreover, the gap between the first connecting plate 11 and the limiting seat 5 can also reserve buffer space for the first connecting plate 11 when it is pressed, thereby avoiding damage to the first piezoelectric stack 1 due to direct hard contact between the first connecting plate 11 and the limiting seat 5 when it is pressed.

[0059] Correspondingly, the second limiting groove 521 penetrates the second limiting member 52 along the second direction, and there are gaps between the second piezoelectric stack 2 and the third groove wall 5211, as well as between the second piezoelectric stack 2 and the fourth groove wall 5212. This ensures that during the axial expansion of the second piezoelectric stack 2, only the end face of the second connecting plate 21 along the extension direction of the second piezoelectric stack 2 contacts the limiting seat 5, while the sides of the second connecting plate 21 along the first direction do not contact the limiting seat 5. This avoids the friction between the second connecting plate 21 and the limiting seat 5 from affecting the actuation of the second piezoelectric stack 2. Moreover, the gap between the second connecting plate 21 and the limiting seat 5 can also reserve buffer space for the second connecting plate 21 when it is compressed, thereby avoiding damage to the second piezoelectric stack 2 due to the direct hard contact between the second connecting plate 21 and the limiting seat 5 when it is compressed.

[0060] In addition, in this embodiment, the first limiting member 51 is provided with a first arc-shaped protrusion 512 on the side of the first piezoelectric stack 1 facing the fixed seat 3 along the extension direction of the first piezoelectric stack 1. The first arc-shaped protrusion 512 is disposed in the first limiting groove 511 and protrudes from the side away from the fixed seat 3 to the side close to the fixed seat 3 along the extension direction of the first piezoelectric stack 1. The first piezoelectric stack 1 is pressed against the top of the first arc-shaped protrusion 512 by the first connecting plate 11, thereby reducing the contact area between the first connecting plate 11 and the limiting seat 5, and thus reducing the wear caused to the first connecting plate 11 and / or the limiting seat 5 when the first connecting plate 11 impacts the limiting seat 5.

[0061] Furthermore, the second limiting member 52 is provided with a second arc-shaped protrusion 522 on the side of the second piezoelectric stack 2 facing the fixed seat 3 along the extension direction of the second piezoelectric stack 2. The second arc-shaped protrusion 522 is disposed in the second limiting groove 521 and protrudes from the side away from the fixed seat 3 to the side close to the fixed seat 3 along the extension direction of the second piezoelectric stack 2. The second piezoelectric stack is pressed against the top of the second arc-shaped protrusion 522 by the second connecting plate 21, thereby reducing the contact area between the second connecting plate 21 and the limiting seat 5, and thus reducing the wear caused to the second connecting plate 21 and / or the limiting seat 5 when the second connecting plate 21 impacts the limiting seat 5.

[0062] Furthermore, it is worth noting that in this embodiment, both the first limiting member 51 and the second limiting member 52 are made of wear-resistant alloy material, that is, the limiting seat 5 is made of wear-resistant alloy material, thereby further reducing the wear and tear on the limiting seat 5 caused by impact.

[0063] It is understandable that the first connecting plate 11 and the second connecting plate 21 are also made of wear-resistant alloy material, thereby further reducing the wear and tear on the first connecting plate 11 and the second connecting plate 21 caused by impact.

[0064] Moreover, both the first ball head 61 and the second ball head 62 are made of wear-resistant alloy material, which can improve the service life of the first ball head 61 and the second ball head 62.

[0065] For example, the wear-resistant alloy material can be high manganese steel or wear-resistant alloy steel, etc., and this embodiment does not impose specific limitations on it.

[0066] Example 2

[0067] Please see Figures 7 to 11 Compared to Embodiment 1, the difference in this embodiment is that: the first limiting member 51 is a first pin, which is disposed on the side of the amplifying plate 4 facing the fixed base 3 along the extension direction of the first piezoelectric stack 1 and extends along the second direction. The second direction is perpendicular to both the first direction and the extension direction of the first piezoelectric stack 1. A first slot 111 is provided at the end of the first piezoelectric stack 1 away from the fixed base 3. The first slot 111 extends along the second direction, and the first pin is embedded in the first slot 111. That is, in this embodiment, the first piezoelectric stack 1 is limited by the first pin and the first slot 111 to prevent the first piezoelectric stack 1 from shifting along the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0068] It is understood that in this embodiment, the first slot 111 is disposed on the end face of the first connecting plate 11.

[0069] Correspondingly, the second limiting member 52 is a second pin. The second pin is disposed on the side of the amplifying plate 4 facing the fixing base 3 along the extension direction of the first piezoelectric stack 1 and extends along the second direction. The end of the first piezoelectric stack 1 away from the fixing base 3 is provided with a second slot 211. The second slot 211 extends along the second direction. The second pin is embedded in the second slot 211. That is, in this embodiment, the second piezoelectric stack 2 is limited by the second pin and the second slot 211 to prevent the second piezoelectric stack 2 from shifting along the arrangement direction of the first piezoelectric stack 1 and the second piezoelectric stack 2.

[0070] It is understood that in this embodiment, the second slot 211 is disposed on the end face of the second connecting plate 21.

[0071] Based on the above, in this embodiment, the amplifying plate 4 is provided with a third slot 41 on the side facing the fixing base 3 along the extension direction of the first piezoelectric stack 1. The third slot 41 extends along the second direction, and the first pin is embedded in the third slot 41. A portion of the first pin extends out of the third slot 41 along its radial direction. The portion of the first pin extending out of the third slot 41 can be embedded in the first slot 111. Moreover, there is a gap fit between the first pin and the slot wall of the third slot 41, and the gap is filled with structural adhesive, so that the first pin can be bonded to the amplifying plate 4.

[0072] As can be seen from the above, since there is a clearance fit between the first pin and the wall of the third slot 41, this embodiment can, when assembling the piezoelectric stack actuation device, firstly embed the first pin into both the first slot 111 and the third slot 41, and then bond the first pin to the amplification plate 4 by filling the gap with structural adhesive. This ensures that the first piezoelectric stack 1 and the second piezoelectric stack 2 are stably installed between the fixing base 3 and the amplification plate 4, and ensures that the first piezoelectric stack 1 and the second piezoelectric stack 2 can be stably actuated.

[0073] Correspondingly, the amplifying plate 4 is provided with a fourth slot 42 on the side of the fixed base 3 along the extension direction of the second piezoelectric stack 2. The fourth slot 42 extends along the second direction, and the second pin is embedded in the fourth slot 42. A portion of the second pin extends out of the fourth slot 42 along its radial direction. The portion of the second pin extending out of the fourth slot 42 can be embedded in the second slot 211. Moreover, there is a clearance fit between the second pin and the slot wall of the fourth slot 42, and the clearance is filled with structural adhesive, so that the first pin can be bonded to the amplifying plate 4.

[0074] As can be seen from the above, since there is a clearance fit between the second pin and the wall of the fourth slot 42, this embodiment can first embed the second pin into both the second slot 211 and the fourth slot 42 when assembling the piezoelectric stack actuation device, and then bond the second pin to the amplification plate 4 by filling the gap with structural adhesive, thereby ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 are stably installed between the fixing base 3 and the amplification plate 4, and ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 can be stably actuated.

[0075] In addition, in this embodiment, the first connecting plate 11 is bonded to the first piezoelectric stack 1 with structural adhesive, the second connecting plate 21 is bonded to the second piezoelectric stack 2 with structural adhesive, the first ball head 61 is bonded to the first piezoelectric stack 1 with structural adhesive, the second ball head 62 is bonded to the second piezoelectric stack 2 with structural adhesive, and both the first ball head 61 and the second ball head 62 are bonded to the fixing base 3 with structural adhesive, thereby further ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 are stably installed between the fixing base 3 and the amplification plate 4, and further ensuring that the first piezoelectric stack 1 and the second piezoelectric stack 2 can be stably actuated.

[0076] Furthermore, both the first and second pins are made of wear-resistant alloy material, thereby reducing the wear and tear on the first and second pins caused by impact.

[0077] It is understandable that the first connecting plate 11 and the second connecting plate 21 are also made of wear-resistant alloy material, thereby further reducing the wear and tear on the first connecting plate 11 and the second connecting plate 21 caused by impact.

[0078] For example, the wear-resistant alloy material can be high manganese steel or wear-resistant alloy steel, etc., and this embodiment does not impose specific limitations on it.

[0079] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A piezoelectric stack actuation device, comprising a first piezoelectric stack (1), a second piezoelectric stack (2), a fixed base (3), and an amplifying plate (4), wherein the first piezoelectric stack (1) and the second piezoelectric stack (2) are arranged in parallel and are both installed between the fixed base (3) and the amplifying plate (4), one end of the first piezoelectric stack (1) and one end of the second piezoelectric stack (2) are both connected to the fixed base (3), and the other end of the first piezoelectric stack (1) and the other end of the second piezoelectric stack (2) abut against the amplifying plate (4), characterized in that, The piezoelectric stack actuator also includes: The first limiting member (51) is configured to limit the first piezoelectric stack (1) from shifting along a first direction, the first direction being the arrangement direction of the first piezoelectric stack (1) and the second piezoelectric stack (2); The second limiting member (52) is configured to limit the displacement of the second piezoelectric stack (2) along the first direction; The first piezoelectric stack (1) is provided with a first connecting plate (11) at one end away from the fixed base (3), and the second piezoelectric stack (2) is provided with a second connecting plate (21) at one end away from the fixed base (3). The first connecting plate (11) and the second connecting plate (21) press against the amplification plate (4).

2. The piezoelectric stack actuation device according to claim 1, characterized in that, The first limiting member (51) and the second limiting member (52) are both fixedly connected to the amplifying plate (4). The first limiting member (51) is provided with a first limiting groove (511). The end of the first piezoelectric stack (1) away from the fixed base (3) extends into the first limiting groove (511). The first limiting groove (511) is formed with a first groove wall (5111) and a second groove wall (5112). The first groove wall (5111) and the second groove wall (5112) are arranged opposite to each other along the first direction. The part of the first piezoelectric stack (1) extending into the first limiting groove (511) is located between the first groove wall (5111) and the second groove wall (5112). The second limiting member (52) is provided with a second limiting groove (521). The end of the second piezoelectric stack (2) away from the fixed base (3) extends into the second limiting groove (521). The second limiting groove (521) is formed with a third groove wall (5211) and a fourth groove wall (5212). The third groove wall (5211) and the fourth groove wall (5212) are arranged opposite to each other along the first direction. The part of the second piezoelectric stack (2) extending into the second limiting groove (521) is located between the third groove wall (5211) and the fourth groove wall (5212).

3. The piezoelectric stack actuation device according to claim 2, characterized in that, The first limiting groove (511) passes through the first limiting member (51) along the second direction. The second direction is perpendicular to the first direction and the extension direction of the first piezoelectric stack (1). There are gaps between the first piezoelectric stack (1) and the first groove wall (5111) and between the first piezoelectric stack (1) and the second groove wall (5112). The second limiting groove (521) passes through the second limiting member (52) along the second direction, and there are gaps between the second piezoelectric stack (2) and the third groove wall (5211) and between the second piezoelectric stack (2) and the fourth groove wall (5212).

4. The piezoelectric stack actuation device according to claim 2, characterized in that, The first limiting member (51) has a first arc-shaped protrusion (512) on the side of the fixed base (3) along the extension direction of the first piezoelectric stack (1). The first arc-shaped protrusion (512) is disposed in the first limiting groove (511) and protrudes from the side away from the fixed base (3) to the side close to the fixed base (3) along the extension direction of the first piezoelectric stack (1). The first piezoelectric stack (1) presses against the top of the first arc-shaped protrusion (512). The second limiting member (52) is provided with a second arc-shaped protrusion (522) on the side of the fixed seat (3) along the extension direction of the second piezoelectric stack (2). The second arc-shaped protrusion (522) is disposed in the second limiting groove (521) and protrudes from the side away from the fixed seat (3) to the side close to the fixed seat (3) along the extension direction of the second piezoelectric stack (2). The second piezoelectric stack (2) presses against the top of the second arc-shaped protrusion (522).

5. The piezoelectric stack actuation device according to claim 2, characterized in that, Both the first limiting member (51) and the second limiting member (52) are made of wear-resistant alloy material.

6. The piezoelectric stack actuation device according to claim 1, characterized in that, The first limiting member (51) is a first pin. The first pin is disposed on the side of the amplifying plate (4) facing the fixed base (3) along the extension direction of the first piezoelectric stack (1) and extends along the second direction. The second direction is perpendicular to the first direction and the extension direction of the first piezoelectric stack (1). A first slot (111) is provided at the end of the first piezoelectric stack (1) away from the fixed base (3). The first slot (111) extends along the second direction. The first pin is embedded in the first slot (111). The second limiting member (52) is a second pin. The second pin is disposed on the side of the amplifying plate (4) facing the fixed seat (3) along the extension direction of the first piezoelectric stack (1) and extends along the second direction. A second slot (211) is provided at the end of the first piezoelectric stack (1) away from the fixed seat (3). The second slot (211) extends along the second direction, and the second pin is embedded in the second slot (211).

7. The piezoelectric stack actuation device according to claim 6, characterized in that, The amplification plate (4) is provided with a third slot (41) on the side of the fixed base (3) along the extension direction of the first piezoelectric stack (1). The third slot (41) extends along the second direction. The first pin is embedded in the third slot (41), and a portion of the first pin extends out of the third slot (41) along its radial direction. The first pin and the groove wall of the third slot (41) are in clearance fit, and the gap is filled with structural adhesive. The amplification plate (4) is provided with a fourth slot (42) on the side of the fixed base (3) along the extension direction of the second piezoelectric stack (2). The fourth slot (42) extends along the second direction. The second pin is embedded in the fourth slot (42), and a portion of the second pin extends out of the fourth slot (42) along its radial direction. The second pin and the slot wall of the fourth slot (42) are in clearance fit, and the gap is filled with structural adhesive.

8. The piezoelectric stack actuation device according to claim 6, characterized in that, Both the first and second pins are made of wear-resistant alloy material.

9. The piezoelectric stack actuation device according to claim 1, characterized in that, The first connecting plate (11) is bonded to the first piezoelectric stack (1) by structural adhesive, and the second connecting plate (21) is bonded to the second piezoelectric stack (2) by structural adhesive.

Images