A displacement amplification device and a mechanical device

Abstract

This utility model relates to the field of precision drive technology, specifically to a displacement amplification device and mechanical equipment. A displacement amplification device includes: a piezoelectric drive unit; a pulley assembly, the output end of the piezoelectric drive unit abutting against the pulley assembly; a displacement output assembly, including an output slider connected to the free end of the rope of the pulley assembly; in the non-amplified state, a constant external force is applied to the output slider to maintain the tension of the rope, thus keeping the pulley assembly balanced; in the amplified state, the vibration of the piezoelectric drive unit disrupts the balance of the pulley assembly, causing the pulley assembly to move away from the piezoelectric drive unit; the linear displacement of the output slider in the non-amplified and amplified states is the amplified displacement. This utility model provides a displacement amplification device and mechanical equipment to solve the problem that displacement amplification mechanisms (such as hinges) often suffer from complex structures and lateral force interference, affecting the accuracy of displacement amplification.

Description

Technical Field

[0001] This utility model relates to the field of precision drive technology, specifically to a displacement amplification device and mechanical equipment. Background Technology

[0002] In the fields of optical focusing and micro / nano fabrication, technicians often design displacement amplification devices to mechanically amplify the minute displacements of piezoelectric ceramics. Existing displacement amplification mechanisms (such as hinges) often suffer from structural complexity and lateral force interference, affecting the accuracy of displacement amplification. Utility Model Content

[0003] In view of this, the present invention provides a displacement amplification device and mechanical equipment to solve the problem that displacement amplification mechanisms (such as hinges) often have complex structures and lateral force interference, which affect the accuracy of displacement amplification.

[0004] In a first aspect, this utility model provides a displacement amplification device, comprising:

[0005] A piezoelectric drive unit is used to convert input voltage into its own vibration;

[0006] A pulley assembly is disposed on one side of the piezoelectric drive unit, and the output end of the piezoelectric drive unit abuts against the pulley assembly;

[0007] A displacement output component includes an output slider disposed on the side of the pulley assembly away from the piezoelectric drive unit, and the output slider is connected to the free end of the rope of the pulley assembly;

[0008] In the non-amplified state, a constant external force is applied to the output slider to maintain the tension of the rope so that the pulley assembly can maintain balance.

[0009] In the magnified state, the vibration of the piezoelectric drive unit disrupts the balance of the pulley assembly. The constant external force drives the output slider to move the rope, and the pulley assembly moves away from the piezoelectric drive unit so that the rope returns to a taut state and the pulley assembly restores its balance.

[0010] The linear displacement of the output slider in the non-amplified state and the amplified state is the amplified displacement.

[0011] When the output slider is subjected to a constant external force to keep the rope taut, and the state changes from non-amplified to amplified, the output end of the piezoelectric drive unit comes into contact with the pulley assembly. The piezoelectric drive unit disrupts the balance of the pulley assembly, causing the pulley assembly to move away from the piezoelectric drive unit. This causes the output slider to move, and the constant external force on the rope returns to tautness. The linear displacement of the output slider is the amplified displacement. The overall structure is relatively simple, and there is no interference from lateral forces, ensuring the accuracy of displacement amplification. In this embodiment, the piezoelectric drive unit 1 is a piezoelectric ceramic.

[0012] In one alternative embodiment, the assembly further includes a support base, and the pulley assembly includes at least one movable pulley and a first fixed base, the first fixed base being connected to the support base, the first fixed base being provided with a slide rail, and the movable pulley being slidably connected to the slide rail.

[0013] In one optional embodiment, the pulley assembly further includes a second fixed seat, at least one stationary pulley, and a rope. The second fixed seat is fixed to the support base, the stationary pulley is disposed on the second fixed seat, and the other free end of the rope is connected to the stationary pulley, the second fixed seat, or the movable pulley.

[0014] In one optional embodiment, the first fixed base has a force-receiving end on its side wall facing the piezoelectric drive unit, the surface of the force-receiving end is in contact with the piezoelectric drive unit, and the force-receiving end is connected to the movable pulley.

[0015] In one alternative embodiment, the displacement output assembly further includes a slide table, the output slider is slidably connected to the slide table, and the rope is arranged parallel to the slide table.

[0016] In one alternative embodiment, the displacement output assembly further includes a traction end disposed on the side of the output slider, and a rope is connected to the side of the output slider opposite to the traction end.

[0017] In an alternative implementation, a tensioning component is also included, connected to the piezoelectric drive unit, to achieve pretensioning.

[0018] In one optional embodiment, the tension assembly includes a fixed rod, an adjusting member, and an elastic return member. The fixed rod is connected to the piezoelectric drive unit, the adjusting member is sleeved on the outer periphery of the fixed rod, and the adjusting member is rotatably connected to the fixed rod. One end of the elastic return member abuts against one end of the adjusting member, and the other end of the elastic return member abuts against the piezoelectric drive unit.

[0019] In one alternative embodiment, the pulley assembly includes at least one movable pulley and at least one movable pulley, with the rope wound around it in an orderly manner, and the output of the piezoelectric drive unit acts on the movable pulley or the rope.

[0020] Secondly, this utility model also provides a mechanical device, including the aforementioned displacement amplification device.

[0021] The displacement amplification device provided by this utility model has the following advantages: (1) By setting an output slider, the displacement output component's motion displacement is amplified by the output slider. The overall structure is relatively simple and there is no interference from lateral forces, thus ensuring the accuracy of displacement amplification; (2) By changing the number of moving pulleys and stationary pulleys, the displacement amplification ratio can be changed to achieve large displacement output. Since the displacement amplification ratio is an integer value, there is no motion coupling error, thus having the advantage of high displacement accuracy; (3) By setting a traction end and an elastic recovery component, the entire device is subjected to zero external force in the displacement state, thus ensuring the accuracy of displacement output. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the displacement amplification device according to an embodiment of the present invention;

[0024] Figure 2 This is a front view of the displacement magnification device according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1. Piezoelectric drive unit; 2. Pulley assembly; 201. First fixed base; 202. Second fixed base; 203. First stationary pulley; 204. Second stationary pulley; 205. First movable pulley; 206. Second movable pulley; 207. Rope; 208. Force-receiving end; 3. Displacement output assembly; 301. Output slider; 302. Slide table; 303. Traction end; 4. Tension assembly; 401. Elastic recovery element; 402. Fixed rod; 403. Adjusting element. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. 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.

[0027] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, a displacement amplification device is provided, comprising: a piezoelectric drive unit 1; a pulley assembly 2 disposed on one side of the piezoelectric drive unit 1, the output end of the piezoelectric drive unit 1 abutting against the pulley assembly 2; and a displacement output assembly 3, including an output slider 301 disposed on the side of the pulley assembly 2 away from the piezoelectric drive unit 1, the output slider 301 being connected to the free end of the rope 207 of the pulley assembly 2. In the non-amplified state, a constant external force is applied to the output slider 301 to maintain the tension of the rope 207, thereby maintaining the balance of the pulley assembly 2. In the amplified state, the vibration of the piezoelectric drive unit 1 disrupts the balance of the pulley assembly 2, the constant external force drives the output slider 301 to move the rope 207, and the pulley assembly 2 moves away from the piezoelectric drive unit 1, so that the rope 207 returns to the tension state and the pulley assembly 2 restores its balance. The linear displacement of the output slider 301 in the non-amplified state and the amplified state is the amplified displacement.

[0029] When the output slider 301 is subjected to a constant external force to keep the rope 207 taut, when switching from a non-amplified state to an amplified state, the output end of the piezoelectric drive unit 1 abuts against the pulley assembly 2. The piezoelectric drive unit 1 disrupts the balance of the pulley assembly 2, causing the pulley assembly 2 to move away from the piezoelectric drive unit 1. The output slider 301 moves, and the constant external force on the rope 207 becomes taut again. The linear displacement of the output slider 301 is the amplified displacement. The overall structure is relatively simple, there is no interference from lateral forces, and the accuracy of displacement amplification is guaranteed. In this embodiment, the piezoelectric drive unit 1 is a piezoelectric ceramic.

[0030] In one embodiment, such as Figure 1 , Figure 2As shown, the assembly also includes a support base. The pulley assembly 2 includes at least one movable pulley and a first fixed base 201. The first fixed base 201 is fixedly connected to the support base, and a slide rail is provided on the first fixed base 201. The movable pulley is slidably connected to the slide rail. In this embodiment, there are two movable pulleys (i.e., a first movable pulley 205 and a second movable pulley 206). The first fixed base 201 is supported by the support base, and the movable pulley is slidably connected to the slide rail to realize the movement of the movable pulley relative to the first fixed base 201, thereby realizing the displacement movement of the pulley assembly 2. It should be noted that each movable pulley is slidably connected to the first fixed base 201.

[0031] In one embodiment, such as Figure 1 , Figure 2 As shown, the pulley assembly 2 also includes a second fixed base 202, at least one stationary pulley, and a rope 207. The second fixed base 202 is fixed to the support base, the movable pulley is disposed on the first fixed base 201, and the stationary pulley is disposed on the second fixed base 202. The other free end of the rope 207 is connected to the stationary pulley, the second fixed base 202, or the movable pulley. Specifically, the rope 207 is a Kevlar fiber rope. In this embodiment, there are two stationary pulleys (i.e., a first stationary pulley 203 and a second stationary pulley 204). The rope 207 passes sequentially through the groove of the first movable pulley 205, the groove of the second stationary pulley 204, and the groove of the second movable pulley 206 before connecting to the output slider 301.

[0032] In this embodiment, as Figure 1 , Figure 2 As shown, a first stationary pulley 203 and a second stationary pulley 204 are arranged along the height direction of the second fixed base 202. There are two movable pulleys, a first movable pulley 205 and a second movable pulley 206, arranged along the height direction of the first fixed base 201. The central axes of the first stationary pulley 203 and the second stationary pulley 204 form a first vertical plane, and the central axes of the first movable pulley 205 and the second movable pulley 206 form a second vertical plane. The first and second vertical planes are parallel. Due to the presence of the first movable pulley 205 and the second movable pulley 206, when the first movable pulley 205 and the second movable pulley 206 move towards the second fixed base 202, the rope 207 is kept taut by a constant external force from the traction end 303, causing the traction end 303 to move and amplify the displacement of the movable pulleys. That is, the displacement distance of the rope 207 is twice the displacement of the first movable pulley 205 towards the second fixed seat 202 or the displacement of the second movable pulley 206 towards the second fixed seat 202. No motion coupling error occurs throughout the process, resulting in high displacement accuracy. It should be noted that in this embodiment, both the first fixed seat 201 and the second fixed seat 202 are fixedly mounted on the support base.

[0033] In this embodiment, as Figure 1 , Figure 2 As shown, the movable pulley and the stationary pulley are staggered along the height direction, that is, the central axis of the first movable pulley 205 is in the Z-axis direction ( Figure 1 The height of the second static pulley 204 in the Z-axis direction is higher than the central axis of the first static pulley 203, and the central axis of the second static pulley 204 in the Z-axis direction is higher than the central axis of the first static pulley 203. Figure 1 The height of the second movable pulley 206 in the Z-axis direction is higher than the central axis of the first movable pulley 205, and the height of the central axis of the second movable pulley 206 in the Z-axis direction is higher than the central axis of the second stationary pulley 204, so that the stationary pulley and the movable pulley are connected in series by the rope 207.

[0034] In one embodiment, such as Figure 1 , Figure 2 As shown, the first fixed base 201 has a force-receiving end 208 on its side wall facing the piezoelectric drive unit 1. The surface of the force-receiving end 208 abuts against the piezoelectric drive unit 1, and the force-receiving end 208 is connected to the movable pulley. The piezoelectric drive unit 1 transmits force to the force-receiving end 208, which then slides along the first fixed base 201 after receiving the force. In this embodiment, the connection method between the movable pulley and the force-receiving end 208 is not specifically limited. For example, an "L" or "U" shaped connecting rod is provided inside the first fixed base 201, with one end of the connecting rod being the force-receiving end 208 and the other end connected to the movable pulley. The force received by the force-receiving end 208 from the piezoelectric drive unit 1 drives the movable pulley to move along the slide rail.

[0035] In one embodiment, such as Figure 1 , Figure 2 As shown, the displacement output component 3 also includes a slide table 302, an output slider 301 slidably connected to the slide table 302, and a rope 207 arranged parallel to the slide table 302. The output slider 301 slides on the slide table 302, and the rope 207 is parallel to the slide table 302, so that the displacement distance of the rope 207 is the sliding distance of the output slider 301.

[0036] In one embodiment, such as Figure 1 , Figure 2 As shown, the displacement output assembly 3 also includes a traction end 303, which is located on the side of the output slider 301. A rope 207 is connected to the side of the output slider 301 opposite to the traction end 303. A traction force is applied to the output slider 301 by the traction end 303, so that the rope 207 remains taut during movement.

[0037] In one embodiment, such as Figure 1 , Figure 2 As shown, it also includes a tension component 4, which is connected to the piezoelectric drive unit 1 to achieve pre-tensioning, thereby ensuring the stability of the tension component 4.

[0038] In one embodiment, such as Figure 1 , Figure 2 As shown, the tension assembly 4 includes a fixed rod 402, an adjusting member 403, and an elastic return member 401. The fixed rod 402 is connected to the piezoelectric drive unit 1. The adjusting member 403 is sleeved on the outer periphery of the fixed rod 402 and is rotatably connected to the fixed rod 402. One end of the elastic return member 401 abuts against one end of the adjusting member 403, and the other end of the elastic return member 401 abuts against the piezoelectric drive unit 1. Specifically, the elastic return member 401 is a spring, and the adjusting member 403 is a nut. The force exerted by the elastic return member 401 on the piezoelectric drive unit 1 is adjusted by adjusting the position of the adjusting member 403 on the fixed rod 402. It should be noted that during the preparation process, the tension applied by the traction end 303 (i.e., the constant external force on the output slider 301) and the displacement of the piezoelectric drive unit 1 pushing the movable pulley are pre-calibrated. That is, the tension applied by the traction end 303 and the displacement of the piezoelectric drive unit 1 pushing the movable pulley are set accordingly to keep the rope 207 taut at all times.

[0039] In this embodiment, as Figure 1 , Figure 2 As shown, the output slider 301 has a scale on its side so that people can easily observe the scale changes.

[0040] A mechanical device comprising the aforementioned displacement amplification device.

[0041] In practical implementation, the displacement amplification device has two states: non-amplification state and amplification state. In the non-amplification state, a constant external force is applied to the traction end 303, the elastic return element 401 remains free, the output slider 301 remains stationary, the rope 207 remains taut, and the entire pulley assembly 2 maintains balance. In the displacement state, the piezoelectric drive unit 1 drives the force-receiving end 208 of 208 to move towards the second fixed seat 202, that is, the movable pulley moves along the slide rail towards the second fixed seat 202. Figure 1 In the X direction, the traction end 303 applies a constant external force to keep the rope 207 taut. At this time, the displacement of the output slider 301 in the X direction ( Figure 1 The X direction in the diagram refers to the movable pulley in the X direction. Figure 1 The output displacement of the slider 301 is four times the displacement of a movable pulley in the X direction along the slide rail, that is, the output displacement of the output slider 301 is four times the displacement of a movable pulley, so as to achieve the displacement amplification effect.

[0042] It should be noted that, regardless of whether it is in a free state or a displacement state, the tension applied by the traction end 303 is only to keep the rope 207 taut, and the rope 207 does not exert any force on the movable pulley.

[0043] In this embodiment, the piezoelectric drive unit 1 is a PZT-8 piezoelectric stack, and a DC drive voltage of 0-150V is applied, corresponding to a displacement of 0-15. u If m, then the output displacement of the corresponding output slider 301 is 0-30. u m, that is, if the number of movable pulleys is one, the distance the movable pulley moves toward the second fixed seat 202 is 5. u If m, then the displacement output by the output slider 301 is 10. u m, with a displacement amplification ratio of 2 (displacement amplification ratio = displacement output by output slider 301 / distance the moving pulley moves toward the second fixed seat 202), thus achieving high displacement accuracy.

[0044] As an alternative implementation, the number of stationary pulleys can be 1, 3, 4, 5, or even more, and the number of movable pulleys can also be 1, 3, 4, 5, or even more, with a one-to-one correspondence between the stationary and movable pulleys. It should be noted that different numbers of movable and stationary pulleys result in different output displacements. Taking a configuration of 3 movable pulleys and 3 stationary pulleys as an example, if the distance the movable pulley moves towards the second fixed base 202 is 5... u If m, then the displacement output by the output slider 301 is 30. u m, to have different displacement amplification ratios.

[0045] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A displacement amplification device for converting an external input voltage into amplified displacement, characterized in that, include: A piezoelectric drive unit (1) is used to convert the input voltage into its own vibration; A pulley assembly (2) is disposed on one side of the piezoelectric drive unit (1), and the output end of the piezoelectric drive unit (1) abuts against the pulley assembly (2); The displacement output assembly (3) includes an output slider (301) disposed on the side of the pulley assembly (2) away from the piezoelectric drive unit (1), and the output slider (301) is connected to the free end of the rope (207) of the pulley assembly (2); In the non-amplified state, a constant external force is applied to the output slider (301) to keep the rope (207) taut so that the pulley assembly (2) remains in balance; In the amplified state, the piezoelectric drive unit (1) vibrates and disrupts the balance of the pulley assembly (2). The constant external force drives the output slider (301) to move the rope (207) and the pulley assembly (2) moves away from the piezoelectric drive unit (1) so that the rope (207) returns to a taut state and the pulley assembly (2) restores its balance. The linear displacement of the output slider (301) in the non-amplified state and the amplified state is the amplified displacement.

2. The displacement amplification device according to claim 1, characterized in that, It also includes a support base, and the pulley assembly (2) further includes at least one movable pulley and a first fixed base (201). The first fixed base (201) is connected to the support base, and a slide rail is provided on the first fixed base (201). The movable pulley is slidably connected to the slide rail.

3. The displacement amplification device according to claim 2, characterized in that, The pulley assembly (2) further includes a second fixed seat (202), at least one stationary pulley and the rope (207). The second fixed seat (202) is fixed on the support seat, the stationary pulley is disposed on the second fixed seat (202), and the other free end of the rope (207) is connected to the stationary pulley or the second fixed seat (202) or the movable pulley.

4. The displacement amplification device according to claim 2, characterized in that, The first fixed base (201) has a force-receiving end (208) on its side wall facing the piezoelectric drive unit (1). The surface of the force-receiving end (208) is in contact with the piezoelectric drive unit (1), and the force-receiving end (208) is connected to the movable pulley.

5. The displacement amplification device according to claim 1, characterized in that, The displacement output component (3) further includes a slide (302), the output slider (301) is slidably connected to the slide (302), and the rope (207) is arranged parallel to the slide (302).

6. The displacement amplification device according to claim 5, characterized in that, The displacement output component (3) further includes a traction end (303), which is located on the side of the output slider (301), and a rope (207) is connected to the side of the output slider (301) away from the traction end (303).

7. The displacement amplification device according to claim 1, characterized in that, It also includes a tension component (4) connected to the piezoelectric drive unit (1) to achieve pretensioning.

8. The displacement amplification device according to claim 7, characterized in that, The tension assembly (4) includes a fixed rod (402), an adjusting member (403), and an elastic return member (401). The fixed rod (402) is connected to the piezoelectric drive unit (1). The adjusting member (403) is sleeved on the outer periphery of the fixed rod (402) and is rotatably connected to the fixed rod (402). One end of the elastic return member (401) abuts against one end of the adjusting member (403), and the other end of the elastic return member (401) abuts against the piezoelectric drive unit (1).

9. The displacement amplification device according to claim 1, characterized in that, The pulley assembly (2) includes at least one movable pulley and at least one movable pulley, on which the rope (207) is wound in an orderly manner, and the output end of the piezoelectric drive unit (1) acts on the movable pulley or the rope (207).

10. A mechanical device, characterized in that, Includes the displacement amplification device as described in any one of claims 1-9.

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