Memory alloy driver

Abstract

The memory alloy driver is characterized in that a sliding block is arranged at the bottom of a cavity of a shell and is in sliding fit with the shell, a release mechanism is arranged at the upper part of the cavity of the shell, is positioned at the upper end of the sliding block and is in limiting fit with the sliding block, and a pulley is fixed in an optical axis extending from one side surface, far away from the sliding block, of the shell and is rotationally connected with the optical axis; one end of the alloy wire is fixedly connected to the bottom wall of the sliding block, the other end of the alloy wire is fixedly connected to the pulley, one end of the spring abuts against the bottom wall of the sliding block, and the other end of the spring abuts against the step face of the side, close to the sliding block, of the optical shaft. The object can be contained on the releasing mechanism, current is introduced into the alloy wire, so that the temperature of the alloy wire is increased, the alloy wire is shrunk, the alloy wire is shrunk to drive the sliding block to move relatively, and the object on the releasing mechanism is released; when the temperature of the alloy wire is reduced, under the combined action of expansion of the alloy wire and the counter-acting force of the spring, the sliding block and the alloy system move oppositely, and therefore the locking action of the sliding block and the releasing mechanism is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of locking and releasing technology, in particular to a memory alloy driver. Background Art

[0002] Locking and releasing are usually the fixing and releasing operations of a mechanism with at least one degree of freedom of movement. The purpose of locking is to constrain and fix the moving parts of the locked mechanism to avoid collision or resonance of the locked mechanism under external excitation. The purpose of releasing is to release the moving parts of the locked mechanism so that the locked mechanism can obtain the original number of degrees of freedom before being locked.

[0003] In the prior art, a combination of memory alloy and spring is often used to lock and release the mechanism, but the combination of memory alloy wire and spring has the following disadvantages: the spring and its fixing structure are heavy, the deformation rate of the memory alloy wire is limited, and in order to obtain a larger deformation, a longer memory alloy wire is required, which makes the overall structure larger in size, increases the complexity of the structure, has a large impact force, and has low system reliability. Utility Model Content

[0004] The utility model provides a memory alloy driver, aiming to improve system reliability and reduce structural complexity.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A memory alloy driver comprises: a housing, an alloy wire, a spring, a slider, a pulley, and a release mechanism;

[0007] The slider is arranged at the bottom of the cavity of the shell and slides with the shell. The release mechanism is arranged at the upper part of the cavity of the shell and is located at the upper end of the slider and is limited with the slider. The pulley is fixed in the optical axis extending from a side of the shell away from the slider and is rotatably connected to the optical axis. One end of the alloy wire is fixedly connected to the bottom wall of the slider, and the other end of the alloy wire is fixedly connected to the pulley. One end of the spring abuts against the bottom wall of the slider, and the other end of the spring abuts against the step surface on the side of the optical axis close to the slider.

[0008] Further preferably, a sliding shaft is movably connected between the contact surface of the housing and the slider, and the sliding shaft abuts against the outer wall of the slider to constrain the relative displacement of the slider and the housing.

[0009] Further preferably, an elastic claw is provided at the contact end of the slider and the release mechanism, which extends from the contact side of the slider and the release mechanism to one side of the release mechanism and bends toward the axial surface of the slider, and contacts the non-return hook of the release mechanism.

[0010] Further preferably, a cover plate is provided on the side of the elastic claw away from the optical axis, a roller is movably connected to the bottom of the cover plate, and an axial surface of the roller abuts against the side surface of the slider.

[0011] Further optimization is that the middle part of the sliding block is in the shape of a groove cavity, and a guide column extending toward the groove is provided on the bottom wall thereof, and the spring is sleeved on the periphery of the guide column.

[0012] Further optimization is that a through hole is provided at one end of the optical axis adjacent to the slider, and the aperture of the through hole is greater than or equal to the diameter of the alloy wire, so as to constrain the displacement path of the alloy wire when it is deformed.

[0013] Further optimization is that one end of the optical axis away from the slider is fixedly connected to the shaft cover, and the cover of the shaft cover extends toward the optical axis and covers the circumference of the optical axis.

[0014] Further optimization is that a limit tube is arranged on the side of the shell away from the slider, a reset rod is movably connected in the tube cavity of the limit tube, and the reset rod and the limit tube are slidably matched.

[0015] Further optimization is that the material of the alloy wire is an alloy metal that shrinks when heated and expands when cooled.

[0016] The present application has the following advantages over the prior art:

[0017] 1. The release mechanism in the present application can hold a load. By passing an electric current through the alloy wire, the temperature of the alloy wire increases and shrinks. The shrinkage of the alloy wire drives the slider to move relative to release the load on the release mechanism. When the temperature of the alloy wire decreases, the expansion of the alloy wire and the reaction force of the spring cause the slider and the alloy wire to move toward each other, so as to achieve the locking action of the slider and the release mechanism with low impact force.

[0018] 2. The memory alloy driver of the present application realizes the release and locking action of the release mechanism through the deformation of the alloy wire, abandoning the traditional method of using pyrotechnics to lock and release the mechanism. The material of the alloy wire is an alloy metal that shrinks when heated and expands when cooled, avoiding environmental pollution. In addition, the alloy wire in the present application has a stable structure and can be reused in locking and releasing operations;

[0019] 3. The setting of the cover plate in the present application can effectively constrain the displacement of the slider in the vertical direction, and can distribute part of the pressure under heavy load conditions, thereby avoiding the difficulty of displacement of the slider due to heavy loads and improving the release and locking reliability of the memory alloy driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of this embodiment in a cross-sectional view.

[0021] Figure numerals: 1-housing; 11-limiting tube; 2-alloy wire; 3-spring; 4-pulley; 5-slider; 51-elastic claw; 6-sliding shaft; 7-cover plate; 71-roller; 8-optical axis; 81-axis cover; 9-reset rod; 10-release mechanism. DETAILED DESCRIPTION

[0022] Locking and releasing are usually the fixing and releasing operations of a mechanism with at least one degree of freedom of movement. The purpose of locking is to constrain and fix the moving parts of the locked mechanism to avoid collision or resonance of the locked mechanism under external excitation. The purpose of releasing is to release the moving parts of the locked mechanism so that the locked mechanism can obtain the original number of degrees of freedom before being locked.

[0023] In the prior art, a combination of memory alloy and spring is often used to lock and release the mechanism, but the combination of memory alloy wire and spring has the following disadvantages: the spring and its fixing structure are heavy, the deformation rate of the memory alloy wire is limited, and in order to obtain a larger deformation, a longer memory alloy wire is required, which makes the overall structure larger in size, increases the complexity of the structure, has a large impact force, and has low system reliability.

[0024] In response to the above technical problems, the present application has made the following designs and ideas: in order to solve the problems of low system reliability and complex structure in the prior art, the release mechanism in the present application can hold loads, and by passing current through the alloy wire, the temperature of the alloy wire increases and shrinks, and the shrinkage of the alloy wire drives the slider to move relative to each other, thereby releasing the load on the release mechanism; when the temperature of the alloy wire decreases, the expansion of the alloy wire and the reaction force of the spring cause the slider and the alloy system to move toward each other, thereby realizing the locking action of the slider and the release mechanism.

[0025] like Figure 1As shown, a memory alloy driver comprises: a shell 1, an alloy wire 2, a spring 3, a slider 5, a pulley 4, and a release mechanism 10; the slider 5 is arranged at the bottom of the cavity of the shell 1 and slidably cooperates with the shell 1, and the release mechanism 10 is arranged at the upper part of the cavity of the shell 1 and is located at the upper end of the slider 5, and is limitedly cooperated with the slider 5. The purpose of such arrangement is to complete the locking or releasing action with the release mechanism 10 by sliding the slider 5 in the shell 1. The pulley 4 is fixed in the optical axis 8 extending from the side of the shell 1 away from the slider 5, and is rotatably connected to the optical axis 8. One end of the alloy wire 2 is fixedly connected to the bottom wall of the slider 5, and the other end thereof is fixedly connected to the pulley 4. This arrangement, on the one hand, ensures that the alloy wire 2 can be extended and retracted through the pulley 4 after deformation, and on the other hand, the deformation of the alloy wire 2 drives the slider 5 to move, thereby further realizing the locking and releasing actions of the memory alloy driver of the present application. One end of the spring 3 abuts against the bottom wall of the slider 5, and the other end thereof abuts against the step surface on the side of the optical axis 8 close to the slider 5. The reaction force of the spring 3 is used to press or release the force between the slider 5 and the alloy wire 2, thereby reducing the impact force between the slider 5 and the shell 1. The release mechanism 10 in the present application can hold a load. By passing an electric current through the alloy wire 2, the temperature of the alloy wire 2 increases and shrinks. The shrinkage of the alloy wire 2 drives the slider 5 to move relatively, thereby releasing the load on the release mechanism 10. When the temperature of the alloy wire 2 decreases, the expansion of the alloy wire 2 and the reaction force of the spring 3 cause the slider 5 and the alloy wire to move toward each other, thereby realizing the locking action of the slider 5 and the release mechanism 10.

[0026] The contact surface between the housing 1 and the slider 5 is movably connected with a sliding shaft 6, which abuts against the outer wall of the slider 5 to constrain the relative displacement between the slider 5 and the housing 1. The setting of the sliding shaft 6 is to realize the sliding between the slider 5 and the housing 1 on the one hand, and to limit the sliding path of the slider 5 in the housing 1 on the other hand, so as to prevent the slider 5 from swinging up and down when sliding in the housing 1, causing the alloy wire 2 to bend and break, and affecting the normal release and locking action of the memory alloy driver.

[0027] The contact end of the slider 5 and the release mechanism 10 is provided with an elastic claw 51, which extends from the contact side of the slider 5 and the release mechanism 10 to one side of the release mechanism 10 and bends toward the axial surface of the slider 5, and contacts the non-return hook of the release mechanism 10. The elastic claw 51 is provided to achieve the limited fit between the slider 5 and the release mechanism 10, and the locking and releasing actions of the release mechanism 10 are completed by hooking the elastic claw 51 with the release mechanism 10.

[0028] The function of the non-return hook of the release mechanism 10 in the present application is to limit the displacement of the release mechanism 10, which is formed by mutually hanging with the elastic claw 51 to form a relative force. The cross-sectional profile of the non-return hook in the present application can be L-shaped, J-shaped, or V-shaped, and the present application does not limit the structural shape. Secondly, the function of the release mechanism 10 in the present application is to serve as a carrier of the load, and then complete the locking and release through the limit cooperation with the slider 5, thereby completing the release of the load.

[0029] A cover plate 7 is provided on the side of the elastic claw 51 away from the optical axis 8, and a roller 71 is movably connected to the bottom of the cover plate 7, and the axial surface of the roller 71 is against the side of the slider 5. The setting of the cover plate 7 can well restrict the displacement of the slider 5 in the vertical direction, and can distribute part of the pressure under a large load, so as to avoid the slider 5 from being difficult to displace due to a large load, and improve the reliability of the release and locking of the memory alloy driver.

[0030] The middle part of the slider 5 is in the shape of a groove, and a guide column extending toward the groove is provided on the bottom wall thereof, and the spring 3 is sleeved around the guide column. This arrangement, on the one hand, limits the deformation path of the spring 3 to prevent the spring 3 from swinging up and down during deformation, and on the other hand, prevents the slider 5 from swinging when displacing, causing the alloy wire 2 to swing together and cause the alloy wire 2 to break.

[0031] In order to constrain the displacement path of the alloy wire 2 during thermal contraction and thermal expansion, a through hole is provided at one end of the optical axis 8 adjacent to the slider 5 , and the aperture of the through hole is greater than or equal to the diameter of the alloy wire 2 , so that the alloy wire 2 can pass through the optical axis 8 and be fixedly connected to the slider 5 .

[0032] In order to prevent pollutants such as flying dust, ash or liquid from entering the optical axis 8, the end of the optical axis 8 away from the slider 5 is fixedly connected to the shaft cover 81, and the cover of the shaft cover 81 extends toward the optical axis 8 and covers the circumference of the optical axis 8.

[0033] A limit tube 11 is provided on the side of the housing 1 away from the slider 5, and a reset rod 9 is movably connected in the lumen of the limit tube 11, and the reset rod 9 and the limit tube 11 are slidably matched. After the slider 5 and the release mechanism 10 in the present application complete the release action, on the one hand, the alloy wire 2 with a reduced temperature expands due to cold and the reaction force of the spring 3 can drive the slider 5 to move in opposite directions, and on the other hand, the reset rod 9 set in the lumen of the limit tube 11 can be pressed to push the slider 5 to reset. After the release mechanism 10 releases the load, the release mechanism 10 can be pressed downward by manual pressing, so that the non-return hook of the release mechanism 10 is hooked with the elastic claw 51 of the slider 5, completing the reset action of the release mechanism 10 and the slider 5.

[0034] In the memory alloy driver of the present application, the release and locking actions of the release mechanism 10 are achieved through the deformation of the alloy wire 2, abandoning the traditional method of using pyrotechnics to lock and release the mechanism. The material of the alloy wire 2 is an alloy metal that shrinks when heated and expands when cooled, avoiding environmental pollution. In addition, the alloy wire 2 in the present application has a stable structure and can be reused in locking and releasing operations.

[0035] This specific embodiment is merely an explanation of the utility model, and it is not a limitation of the utility model. After reading this specification, those skilled in the art can make non-creative modifications to the embodiment as needed, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. A memory alloy driver, characterized in that: include: A housing (1), an alloy wire (2), a spring (3), a slider (5), a pulley (4), and a release mechanism (10); The slider (5) is arranged at the bottom of the cavity of the shell (1) and is slidably matched with the shell (1). The release mechanism (10) is arranged at the upper part of the cavity of the shell (1) and is located at the upper end of the slider (5) and is limitedly matched with the slider (5). The pulley (4) is fixed in an optical axis (8) extending from a side of the shell (1) away from the slider (5) and is rotatably connected to the optical axis (8). One end of the alloy wire (2) is fixedly connected to the bottom wall of the slider (5), and the other end thereof is fixedly connected to the pulley (4). One end of the spring (3) abuts against the bottom wall of the slider (5), and the other end thereof abuts against a step surface on a side of the optical axis (8) close to the slider (5).

2. The memory alloy driver according to claim 1, characterized in that: A sliding shaft (6) is movably connected between the contact surface of the housing (1) and the slider (5); the sliding shaft (6) abuts against the outer wall of the slider (5) to constrain the relative displacement of the slider (5) and the housing (1).

3. The memory alloy driver according to claim 2, characterized in that: An elastic claw (51) is provided at the contact end between the slider (5) and the release mechanism (10); the elastic claw (51) extends from the contact side between the slider (5) and the release mechanism (10) toward one side of the release mechanism (10) and bends toward the axial surface of the slider (5), and contacts the non-return hook of the release mechanism (10).

4. The memory alloy driver according to claim 3, characterized in that: A cover plate (7) is provided on the side of the elastic claw (51) away from the optical axis (8), and a roller (71) is movably connected to the bottom of the cover plate (7), and the axial surface of the roller (71) abuts against the side surface of the slider (5).

5. The memory alloy driver according to claim 3, characterized in that: The middle part of the slider (5) is in the shape of a groove cavity, and a guide column extending toward the groove is provided on the bottom wall thereof, and the spring (3) is sleeved on the periphery of the guide column.

6. The memory alloy driver according to claim 1, characterized in that: A through hole is provided at one end of the optical axis (8) adjacent to the slider (5), and the aperture of the through hole is greater than or equal to the diameter of the alloy wire (2) so as to constrain the displacement path of the alloy wire (2) when it is deformed.

7. The memory alloy driver according to claim 6, characterized in that: One end of the optical axis (8) away from the slider (5) is fixedly connected to a shaft cover (81), and a cover edge of the shaft cover (81) extends toward the optical axis (8) and covers the circumference of the optical axis (8).

8. The memory alloy driver according to claim 1, characterized in that: A limiting tube (11) is provided on a side of the housing (1) away from the slider (5), a reset rod (9) is movably connected in the tube cavity of the limiting tube (11), and the reset rod (9) and the limiting tube (11) are slidably matched.

9. The memory alloy driver according to claim 1, characterized in that: The alloy wire (2) is made of an alloy metal that shrinks when heated and expands when cooled.

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