Distance regulation device and control method for a distance regulation device

Abstract

The application provides a distance adjusting device and a control method of the distance adjusting device. The distance adjusting device comprises a connecting component, the connecting component comprises a first component and a second component, the first component is connected with the second component, and a memory alloy component is arranged at a connecting area of the first component and the second component. The memory alloy component is controlled by a current to drive the first component and the second component to move relatively and / or move towards each other. Therefore, the distance between the first component and the second component can be adjusted, that is, the length of the connecting component can be adjusted, and therefore, the length of the connecting component can be electrically and steplessly adjusted.

Description

[0001] This application claims priority to Chinese Patent Application No. 202110185526.1, filed on February 10, 2021, entitled "Distance Adjustment Device and Control Method for Distance Adjustment Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of terminal equipment technology, specifically to a distance adjustment device and a control method for the distance adjustment device. Background Technology

[0003] Wearable devices generally refer to miniature electronic devices that can be worn on the body for activities. They can be used independently or as portable accessories to mobile terminals. Some wearable devices can be worn with a strap; for example, headphones can be worn on the user's head via a connecting component, and smartwatches or bracelets can be worn on the user's wrist via a connecting component. During wear, to ensure user comfort, a certain gap must be maintained between the connecting component and the user. Due to individual user differences, adaptive adjustment of wearing comfort is an important method to improve the user experience of wearable devices.

[0004] For example, how can headphones be comfortably worn on the user's head? How can smartwatches or bracelets adaptively adjust their tightness based on the user's wrist size? How can AR / VR glasses adjust the distance between the temples or frames based on the distance to the wearer's head or eyes? These are all problems that urgently need to be solved. Currently, most wearable devices use manual adjustments and cannot provide adaptive, stepless adjustment.

[0005] Furthermore, most current smartwatches and fitness trackers include sensors for detecting the user's heart rate or blood pressure. These sensors are typically located on the back cover of the smartwatch or fitness tracker. To improve accuracy during heart rate or blood pressure monitoring, the sensor needs to be in close contact with the user's wrist. However, gaps between the connecting components and the user's wrist reduce the fit between the sensor and the wrist, thus lowering the detection accuracy of the smartwatch or fitness tracker. Moreover, the length adjustment of the aforementioned types of straps is inconvenient. Manually tightening the strap during monitoring to improve the sensor's fit complicates the process, reduces the ease of use of the device, and degrades the user experience. Summary of the Invention

[0006] This application provides a distance adjustment device and a control method for the distance adjustment device, which can electrically and steplessly adjust the length of the connecting component.

[0007] In a first aspect, this application provides a distance adjustment device, which includes a first component and a second component. The first component and the second component are connected, and a shape memory alloy component is disposed in the connection area between the first component and the second component. The shape memory alloy component is driven by current to move the first component relative to the second component and / or move towards each other.

[0008] In the specific technical solution, the memory alloy component includes a first memory alloy component and a second memory alloy component, wherein: one end of the first memory alloy component is fixed to the first component, and the other end drives the second component to move relative to the first component in a first direction; when the temperature of the first memory alloy component is lower than a set threshold, the first memory alloy component is in a first state; when the temperature of the first memory alloy component is higher than the set threshold, the first memory alloy component is in a second state; the first memory alloy component is connected to two electrodes, and the first memory alloy component can be controlled by current to change between the first state and the second state, driving the second component to move relative to the first component in the first direction; one end of the second memory alloy component is fixed to the first component, and the other end drives the second component to move relative to the first component in a second direction, the first direction being opposite to the second direction; when the temperature of the second memory alloy component is lower than the set threshold, the second memory alloy component is in the second state; when the temperature of the second memory alloy component is higher than the set threshold, the second memory alloy component is in the first state; the second memory alloy component is connected to two electrodes, and the second memory alloy component of the second driving part can be controlled by current to change between the first state and the second state, driving the second component to move relative to the first component in the second direction.

[0009] When specifically setting the above-mentioned distance adjustment device, the specific adjustment device further includes an elastic material layer that is stacked and fixed one-to-one with the first memory alloy component; and an elastic material layer that is stacked and fixed one-to-one with the second memory alloy component.

[0010] In the specific technical solution, the aforementioned shape memory alloy component includes multiple first shape memory alloy components and multiple second shape memory alloy components.

[0011] The first memory alloy component and the second memory alloy component may be located on the same side of the second component; or the second component may be located between the first memory alloy component and the second memory alloy component, that is, the first memory alloy component and the second memory alloy component may be located on opposite sides of the second component.

[0012] The aforementioned distance adjustment device may further include an auxiliary part disposed between the second component and the first component. When the auxiliary part is in a first state, the first shape memory alloy component or the second shape memory alloy component can contact the second component. When the auxiliary part is in a second state, there is a gap between the first shape memory alloy component or the second shape memory alloy component and the second component. The first shape memory alloy component and the second shape memory alloy component bend in a second direction in a first form and bend in a first direction in a second form. The first shape memory alloy component changes from the first form to the second form, driving the second component to move in the first direction. The second shape memory alloy component changes from the second form to the first form, driving the second component to move in the second direction.

[0013] When the above-mentioned auxiliary part is specifically set, one end of the auxiliary part is fixed to the first component, and the other end faces the second component. The first memory alloy component and the second memory alloy component are disposed between the first component and the second component. When the auxiliary part is in the second state, it drives the second component to move away from the surface of the first component. There is a gap between the first memory alloy component and the second memory alloy component and the second component.

[0014] When the second component is located between the first shape memory alloy component and the second shape memory alloy component; one end of the auxiliary part is fixed to the first component, and the other end faces the second component; the auxiliary part includes a first auxiliary part and a second auxiliary part, the first auxiliary part and the first driving part are located on the same side, and the second auxiliary part and the second driving part are located on the same side; when the first auxiliary part is in the second state, it drives the second component to move away from the first driving part, and there is a gap between the first driving part and the second component; when the second auxiliary part is in the second state, it drives the second component to move away from the second driving part, and there is a gap between the first driving part and the second component.

[0015] When specifically configuring the structure of the above-mentioned auxiliary part, the auxiliary part may include a first memory alloy spring, which is connected to two electrodes; when the temperature of the first memory alloy spring is lower than a set threshold, the first memory alloy spring is at a first length; when the temperature of the first memory alloy spring is higher than the set threshold, the first memory alloy spring extends toward the second component to a second length, the second length being greater than the first length, driving the second component to move away from the surface of the first component.

[0016] In addition, the above-mentioned auxiliary part also includes a first reset spring, which is arranged in parallel with the first memory alloy spring. When the first memory alloy spring is of a first length, the first reset spring is in an energy-releasing state, and when the first memory alloy spring is of a second length, the first reset spring is in an energy-storing state.

[0017] When specifically configuring the above-mentioned shape memory alloy components, the end of the first shape memory alloy component facing the second component has an elastic layer, and the end of the second shape memory alloy component facing the second component has an elastic layer.

[0018] In another technical solution, the aforementioned first and second shape memory alloy components are parallel to a first direction in a first form, and bent in a direction away from the second component in a second form. The first shape memory alloy component includes a first end and a second end distributed along the second direction. The first end is fixed to the first component, and the second end is connected to a first linkage rod. The first linkage rod includes a third end and a fourth end distributed along the second direction, and the second end and the fourth end are rotatably connected. A first baffle is fixed to the second end. When the first shape memory alloy component changes from the second form to the first form, the fourth end abuts against the first baffle, and the third end drives the second component to move in the first direction. The second shape memory alloy component includes a fifth end and a sixth end distributed along the second direction. The sixth end is fixed to the first component, and the fifth end is connected to a second linkage rod. The second linkage rod includes a seventh end and an eighth end distributed along the second direction, and the fifth end and the seventh end are rotatably connected. A second baffle is fixed to the fifth end. When the second shape memory alloy component changes from the second form to the first form, the seventh end abuts against the second baffle, and the eighth end drives the second component to move in the second direction.

[0019] To enhance the friction between the first linkage rod and the second component, and to increase the friction between the second linkage rod and the second component, the third end of the first linkage rod has an elastic layer, and the eighth end of the second linkage rod has an elastic layer.

[0020] The aforementioned distance adjustment device also includes a stop structure, which is disposed between the second component and the first component. When the stop structure is in the first state, the second component can move relative to the first component; when the stop structure is in the second state, the stop structure is fixedly connected to the second component and the first component.

[0021] Specifically, the stop structure includes a rack, a gear, a locking element, an elastic element, and a shape memory alloy structure. The gear is adapted to the rack; the locking element engages with the gear; the rack is fixedly mounted on a first component, and the gear's shaft is fixedly mounted on a second component; the elastic element is positioned between the locking element and the second component, and the shape memory alloy structure connects the locking element and the second component. Alternatively, the rack is fixedly mounted on the second component, and the gear's shaft is fixedly mounted on the first component; the elastic element is positioned between the locking element and the first component, and the shape memory alloy structure connects the locking element and the first component. When the temperature of the shape memory alloy structure is below a set threshold, the shape memory alloy structure is in a first state, and the elastic element drives the locking element to engage with the gear. When the temperature of the shape memory alloy structure is above the set threshold, the shape memory alloy structure is in a second state, driving the locking element to move away from the gear, allowing the gear to mesh with the rack, and the elastic element is in an energy storage state.

[0022] In another technical solution, the distance adjustment device further includes a second reset spring and a stop structure. The shape memory alloy component is a second shape memory alloy spring, wherein: one end of the second shape memory alloy spring is connected to the first component, and the other end is connected to the second component; the second shape memory alloy spring is connected to two electrodes; when the temperature of the second shape memory alloy spring is lower than a set threshold, the second shape memory alloy spring is at a first length; when the temperature of the second shape memory alloy spring is higher than the set threshold, the second shape memory alloy spring stretches and deforms along a first direction to a second length, the second length being different from the first length, driving the second component to move relative to the first component in the first direction; one end of the second reset spring is connected to the first component, and the other end is connected to the second component; when the second shape memory alloy spring is at the second length, the second reset spring can drive the second component to move relative to the first component along a second direction, the first direction being opposite to the second direction; the stop structure is disposed between the second component and the first component; when the stop structure is in a first state, the second component can move relative to the first component; when the stop structure is in a second state, the stop structure is fixedly connected to the second component and the first component.

[0023] The specific material of the second return spring is not limited and can be a regular spring. Alternatively, the second return spring can also be a shape memory alloy.

[0024] When specifically setting the above-mentioned distance adjustment device, the distance adjustment device further includes a first guide member, which extends along a first direction, and a second reset spring and a second memory alloy spring are installed on the first guide member, thereby improving the stability of the movement of the second reset spring and the second memory alloy spring.

[0025] The aforementioned distance adjustment device includes at least three second shape memory alloy springs and two return springs.

[0026] In a specific technical solution, the second memory alloy spring and the second reset spring are arranged alternately; or, the second memory alloy spring is arranged symmetrically about the axis of symmetry of the second component, and the second reset spring is arranged symmetrically about the axis of symmetry of the second component, with the axis of symmetry extending along the first direction.

[0027] The aforementioned stop structure specifically includes a rack, a gear, a locking element, an elastic element, and a shape memory alloy structure. The gear is adapted to the rack; the locking element engages with the gear; the rack is fixedly mounted on a first component, and the gear's shaft is fixedly mounted on a second component; the elastic element is positioned between the locking element and the second component, and the shape memory alloy structure connects the locking element and the second component; alternatively, the rack is fixedly mounted on the second component, and the gear's shaft is fixedly mounted on the first component; the elastic element is positioned between the locking element and the first component, and the shape memory alloy structure connects the locking element and the first component. When the temperature of the shape memory alloy structure is below a set threshold, the shape memory alloy structure is in a first state, and the elastic element drives the locking element to engage with the gear; when the temperature of the shape memory alloy structure is above the set threshold, the shape memory alloy structure is in a second state, driving the locking element to move away from the gear, allowing the gear to mesh with the rack, and the elastic element is in an energy storage state.

[0028] The aforementioned distance adjustment device includes a wearable device, which is equipped with a first sensor, a power supply module, and a controller. The first sensor is located on the wearable device and is used to detect the pressure value between the wearable device and the user. The power supply module is connected to the shape memory alloy component and is used to drive the shape memory alloy component to deform. The controller is connected to the power supply module and the first sensor and is used to control the current input from the power supply module to the shape memory alloy component according to the pressure value detected by the first sensor, thereby driving the first component and the second component to move relative to each other or towards each other.

[0029] The specific type of the first sensor is not limited, and it may include force sensors and distance sensors. The distance sensor may include capacitive proximity sensors, ultrasonic distance sensors, laser rangefinders, infrared rangefinders, and light sensors. In summary, the first sensor can acquire the positional relationship between the wearable device and the human body, so that the controller can control the relative or opposite movement between the first component and the second component based on the positional relationship.

[0030] In the specific technical solution, the distance adjustment device includes at least two first sensors, which can improve the accuracy of detecting the positional relationship between the distance adjustment device and the user.

[0031] When the distance adjustment device includes at least two first sensors, it may include at least two types of first sensors, for example, it may include a force sensor and a distance sensor, and the force sensor and the distance sensor may be arranged sequentially at intervals.

[0032] The wearable device is also equipped with a second sensor, which is connected to the controller. The second sensor is used to send a usage status signal to the controller when the wearable device is in use. After receiving the usage status signal, the controller controls the current input to the shape memory alloy component by the power supply module.

[0033] In another technical solution, the distance adjustment device includes a wearable device, which is equipped with a power supply module and a voice controller. The power supply module is connected to the shape memory alloy component and is used to drive the shape memory alloy component to deform. The voice controller and the power supply module are used to receive the user's voice commands and control the current input from the power supply module to the shape memory alloy component according to the voice commands, so as to drive the first component and the second component to move relative to each other or move towards each other.

[0034] Secondly, this application also provides a control method for a distance adjustment device. The method includes: acquiring a positional relationship signal between a wearable device and a user; determining whether the positional relationship signal is within a set range; if so, controlling a shape memory alloy component to stop working; if not, controlling the shape memory alloy component to drive a first component and a second component to move relative to each other or towards each other. This solution can adjust the length of the wearable device according to the positional relationship between the wearable device and the user, allowing the user to wear the wearable device more comfortably.

[0035] In the specific technical solution, the aforementioned positional relationship signal includes either a pressure value or a distance value, or both a pressure value and a distance value.

[0036] When the location information includes both pressure and distance values, the above control method may specifically include: first obtaining the distance value between the wearable device and the user; determining whether the distance value is within a first set range; if so, controlling the shape memory alloy component to stop working; if not, controlling the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other.

[0037] The step of controlling the shape memory alloy component to stop working includes: acquiring the pressure value between the wearable device and the user; determining whether the pressure value is within a second preset range; if so, controlling the shape memory alloy component to stop working; if not, controlling the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other. In this solution, the distance between the wearable device and the user is first adjusted by the distance value, and then the user is further judged whether they are wearing the wearable device comfortably based on the pressure value between the wearable device and the user.

[0038] Furthermore, in the aforementioned control method, acquiring the positional relationship signal between the wearable device and the user includes, prior to, acquiring the usage status signal of the wearable device. In other words, the positional relationship between the wearable device and the user is only acquired when the wearable device is in use, and the shape memory alloy components are then controlled to drive the first and second components to move or cease operation.

[0039] The aforementioned control method also includes generating user information through self-learning, and controlling the shape memory alloy components to drive the first and second components to a set position based on this user information. After the user wears the wearable device repeatedly over a long period, this control method can obtain the positional relationship between the first and second components when the user is comfortable wearing it, and use this as the set position. The control method allows the user to directly adjust the first and second components to the set position while wearing the wearable device. This solution can improve the adjustment speed of the wearable device. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a distance adjustment device in one embodiment of this application;

[0041] Figure 2 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application;

[0042] Figure 3 This is a partial structural schematic diagram of the distance adjustment device in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application;

[0044] Figure 5 This is a partial structural schematic diagram of the distance adjustment device in the technical solution of this application;

[0045] Figure 6 This is a schematic diagram of the distance adjustment device in one embodiment of this application;

[0046] Figure 7 This is a schematic diagram of a shape memory alloy component in one embodiment of this application;

[0047] Figure 8 This is a partial structural schematic diagram of the distance adjustment device in an embodiment of this application;

[0048] Figure 9 This is a schematic cross-sectional view of the distance adjustment device in one embodiment of this application;

[0049] Figure 10 This is a schematic diagram of another cross-sectional structure of the distance adjustment device in the embodiments of this application;

[0050] Figure 11 This is a schematic diagram of the operation process of the first driving unit in an embodiment of this application;

[0051] Figure 12 This is a schematic diagram of the operation process of the second drive unit in an embodiment of this application;

[0052] Figure 13This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application;

[0053] Figure 14 This is a schematic diagram of the operation process of the first driving unit in an embodiment of this application;

[0054] Figure 15 This is a schematic diagram of the operation process of the second drive unit in an embodiment of this application;

[0055] Figure 16 This is a schematic diagram of one embodiment of the stop structure in this application;

[0056] Figure 17 This is a cross-sectional structural diagram of the stop structure in an embodiment of this application;

[0057] Figure 18 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application;

[0058] Figure 19 This is a partial structural diagram of a specific adjustment device in an embodiment of this application;

[0059] Figure 20 This is a flowchart of a control method for the distance adjustment device in an embodiment of this application;

[0060] Figure 21 This is a flowchart of another control method for the distance adjustment device in the embodiments of this application.

[0061] Figure label:

[0062] 100 - Equipment body; 200 - Connecting components;

[0063] 210 - First connecting component; 220 - Second connecting component;

[0064] 230 - Distance adjustment device; 240 - First sensor;

[0065] 250 - Power supply module; 260 - Controller;

[0066] 270 - Convex circular arc surface; 280 - Plane;

[0067] 1-First component; 2-Second component;

[0068] 3-Shape memory alloy component; 31-Elastic material layer;

[0069] 4-First drive unit; 41-First shape memory alloy component;

[0070] 411 - First end; 412 - Second end;

[0071] 42-First linkage rod; 421-Third end;

[0072] 422 - Fourth end; 43 - First baffle;

[0073] 44 - Second shape memory alloy spring; 5 - Second drive unit;

[0074] 51 - Second shape memory alloy component; 511 - Fifth end;

[0075] 512 - Sixth end; 52 - Second linkage rod;

[0076] 521 - Seventh end; 522 - Eighth end;

[0077] 53 - Second baffle; 54 - Second return spring;

[0078] 6-Auxiliary part; 61-First shape memory alloy spring;

[0079] 62 - First return spring; 7 - Elastic layer;

[0080] 8-Stop structure; 81-Gear;

[0081] 811-Shaft; 82-Rack;

[0082] 83-Card; 84-Elastic component;

[0083] 85 - Shape memory alloy structure; 9 - First guide component. Detailed Implementation

[0084] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0085] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0086] To facilitate understanding of the distance adjustment device and control method provided in this application embodiment, their application scenarios are first introduced below. The aforementioned distance adjustment device can be a terminal device or a module component. The terminal device can be any terminal device that requires adjustment of the length of a structural component, especially a wearable device. The terminal device can include a device body and connecting components. By adjusting the length of the connecting components, the overall usage state of the terminal device can be adjusted. Taking a wearable device as an example, the user needs to adjust the length of the connecting components to ensure comfortable wear. Especially when the wearable device has a detection sensor, it allows the sensor to contact the user with a more suitable pressure. In the prior art, the length of the connecting components is usually manually adjusted. On the one hand, many connecting components cannot achieve stepless length adjustment, making it difficult for the user to achieve a comfortable level; on the other hand, manual adjustment is cumbersome and may sometimes be inconvenient. Therefore, this application provides a distance adjustment device and a control method for the distance adjustment device, thereby enabling electrically stepless adjustment of the length of the connecting components.

[0087] Figure 1 This is a schematic diagram of one structure of the distance adjustment device in an embodiment of this application. Figure 2 This is a schematic diagram of another structure of the distance adjustment device in an embodiment of this application. For example... Figure 1 and Figure 2 As shown, the distance adjustment device includes a device body 100 and a connecting component 200 connected to the device body 100. The connecting component 200 includes a first connecting component 210, a second connecting component 220, and a shape memory alloy component 3. The shape memory alloy component 3 is disposed between the first connecting component 210 and the second connecting component 220 and can drive the first connecting component 210 to move relative to each other and / or move towards each other, thereby adjusting the length of the connecting component 200.

[0088] The aforementioned distance adjustment device can be a wearable device, such as a headset, watch, bracelet, or AR / VR glasses, etc., and can also be a belt, shoelace, detection device, or monitor stand, etc., that requires distance adjustment. This application does not limit the specific type. When the wearable device is a headset, such as... Figure 1 As shown, the two earpieces of the headset can be considered as the device body 100, and the headband connecting the two earpieces is the connecting component 200. When the wearable device is a watch, such as... Figure 2As shown, the watch face can be considered the device body 100, and the watch strap is the aforementioned connecting component 200. In summary, the main functional component of the distance adjustment device is the device body 100, and the connecting component 200 primarily serves a connecting function. The position of the device body 100 can be adjusted by adjusting the length of the connecting component 200 through the shape memory alloy component 3; alternatively, when the distance adjustment device is a wearable device, it can adjust the pressure value between the wearable device and the user, i.e., comfort; or, when the distance adjustment device is a detection device, it can adjust the pressure value between the detection device and the user, which is beneficial for improving the detection accuracy of the detection device.

[0089] It is worth noting that the first connecting component 210 and the second connecting component 220 in the embodiments of this application can be a separate structure or can be connected by a soft material, that is, the first connecting component 210 and the second connecting component 220 are connected into a whole structure; or the first connecting component 210 and the second connecting component 220 are two independent parts, both of which are applicable to the technical solution of this application.

[0090] Figure 3 This is a schematic diagram of one structure of the distance adjustment device in an embodiment of this application. Please refer to it. Figure 3The aforementioned distance adjustment device 230 specifically includes a first component 1, a second component 2, and a shape memory alloy component 3. The shape memory alloy component 3 is conductive, and the current can cause the temperature of the shape memory alloy component 3 to rise. Specifically, when the temperature of the shape memory alloy component 3 is below a set threshold, it is in a first state; when the temperature of the shape memory alloy component 3 is above the set threshold, it is in a second state. By controlling the magnitude or switching of the current, the temperature of the shape memory alloy component 3 can be controlled, thereby causing the shape memory alloy component 3 to change its shape. The shape memory alloy component 3 is connected between the first component 1 and the second component 2. When the shape memory alloy component 3 changes its shape, it can drive the first component 1 and the second component 2 to move relative to each other and / or move towards each other. The first component 1 is fixedly disposed with the first connecting component 210, and the second component 2 is fixedly disposed with the second connecting component 220. Alternatively, the first component 1 is equivalent to the first connecting component 210, and the second component 2 is equivalent to the second connecting component 220. This application does not impose any limitations. Therefore, when the shape memory alloy component 3 changes its shape, it can drive the first connecting component 210 to move relative to each other and / or move towards each other. Understandably, when the first connecting component 210 and the second connecting component 220 move relative to each other, the overall length of the connecting component 200 shortens; conversely, when the first connecting component 210 and the second connecting component 220 move towards each other, the overall length of the connecting component 200 lengthens. In this solution, the length of the connecting component 200 of the distance adjustment device can be adjusted by controlling the current to drive the shape memory alloy component 3, eliminating the need for manual adjustment using pushing or pulling methods, thus simplifying operation. Furthermore, this solution allows for stepless adjustment using the shape memory alloy component 3, which improves the user experience and comfort.

[0091] Figure 4 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application. Please refer to... Figure 2 and Figure 4 The aforementioned distance adjustment device may further include a first sensor 240, a power supply module 250, and a controller 260. The first sensor 240 is disposed within the distance adjustment device, and its specific location can be designed according to actual product requirements. For example, if the distance adjustment device is an earphone, the first sensor 240 can be disposed on the headband, i.e., the connecting component 200, to monitor the pressure value between the headband and the user's head, ensuring comfortable earphone wearing. If the distance adjustment device is a watch, the first sensor 240 can be disposed on the dial or strap, i.e., on the device body 100 or on the connecting component 200. If the distance adjustment device is a detection device, the first sensor 240 can be disposed on the device body 100 to ensure a good fit between the detection part of the detection device and the user, improving the detection effect.

[0092] The aforementioned power supply module 250 is connected to the shape memory alloy component 3 of the distance adjustment device 230, thereby inputting current into the shape memory alloy component 3 to control its temperature, and thus control the shape memory alloy component 3 to change shape between a first and a second form, driving the first component 1 and the second component 2 to move relative to or towards each other, causing the first connecting component 210 and the second connecting component 220 to move relative to or towards each other. The aforementioned controller 260 is connected to the power supply module 250 and the first sensor 240, and is used to control the current input from the power supply module 250 to the shape memory alloy component 3 based on the position relationship signal detected by the first sensor 240, driving the first connecting component 210 and the second connecting component 220 to move relative to or towards each other. Specifically, a suitable range can be set as the set range, and the controller determines whether the position relationship signal detected by the first sensor 240 is within the set range. If so, the current state of the connecting component 200 is considered suitable, and the shape memory alloy component 3 is controlled to stop working; if not, the current state of the connecting component 200 is considered unsuitable, and the shape memory alloy component 3 drives the first connecting component 210 and the second connecting component 220 to move relative to each other or towards each other until the position relationship signal detected by the first sensor 240 is within the set range.

[0093] In the specific technical solution, the type of the first sensor 240 is not limited, and it can be at least one of the following types: force sensor, capacitive proximity sensor, ultrasonic distance sensor, laser rangefinder, infrared rangefinder, and light sensor. The appropriate type of first sensor 240 can be selected based on the actual situation.

[0094] Specifically, taking the first sensor 240 as a force sensor as an example, the aforementioned positional relationship represents the pressure between the wearable device and the user, and the positional relationship signal is the pressure value. When the pressure value detected by the first sensor 240 is less than the set range, it indicates that the length of the connecting component 200 is too large. The controller controls the distance adjustment device 230 to drive the first connecting component 210 and the second connecting component 220 to move relative to each other, thereby reducing the length of the connecting component 200. When the pressure value detected by the first sensor 240 is greater than the set range, it indicates that the length of the connecting component 200 is too small. The controller controls the distance adjustment device 230 to drive the first connecting component 210 and the second connecting component 220 to move towards each other, thereby increasing the length of the connecting component 200. When the pressure value detected by the first sensor 240 is within the set range, it indicates that the length of the connecting component 200 is appropriate. The controller controls the distance adjustment device 230 to stop driving the first connecting component 210 and the second connecting component 220 to move, so that the positional relationship between the first connecting component 210 and the second connecting component 220 remains fixed.

[0095] The aforementioned distance adjustment device can be set in contact with the user, and the pressure value between the distance adjustment device and the user directly affects the user's comfort for wearable devices and the detection accuracy for detection devices. The controller controls the current input from the power supply module to the shape memory alloy component 3 based on the pressure value obtained by the first sensor 240, thereby controlling the distance adjustment device 230 to adjust the length of the connecting component 200. This allows the distance adjustment device to achieve a better working state and improves the user experience. Furthermore, this solution eliminates the need for manual adjustment of the connecting component 200's length, making the operation simple and intelligent.

[0096] Wearable devices may include at least two primary sensors to improve the interaction between the wearable device and the user, thereby enhancing the user's comfort when wearing the wearable device.

[0097] When a wearable device includes at least two first sensors, the specific types of the first sensors can be different. For example, the wearable device can include a force sensor and a distance sensor. Specifically, the force sensor and distance sensor can be arranged alternately. The wearable device can control different types of first sensors to work together, or select one type of first sensor to work as needed.

[0098] In another embodiment, the distance adjustment device may have an operation button, which is used to control the current input from the power supply module to the shape memory alloy component 3, thereby controlling the distance adjustment device 230 to adjust the length of the connecting component 200.

[0099] Alternatively, in another embodiment, the distance adjustment device may further include a power supply module and a voice controller. The power supply module is connected to the shape memory alloy component 3 of the distance adjustment device 230, thereby inputting current into the shape memory alloy component 3 to control its temperature, and subsequently controlling the shape of the shape memory alloy component 3 to change its shape between a first and a second form. This drives the first component 1 and the second component 2 to move relative to or towards each other, enabling the distance adjustment device 230 to drive the first connecting component 210 and the second connecting component 220 to move relative to or towards each other. The voice controller is connected to the power supply module and is used to receive user voice commands. Based on the received voice commands, the controller controls the current input to the shape memory alloy component 3 by the power supply module to drive the first connecting component 210 and the second connecting component 220 to move relative to or towards each other. For example, if the voice controller receives a voice command of "lengthen", it will control the power supply module to input current into the shape memory alloy component 3, driving the first connecting component 210 and the second connecting component 220 to move towards each other, thereby lengthening the connecting component 200. If the voice controller receives a voice command of "shorten", it will control the power supply module to input current into the shape memory alloy component 3, driving the first connecting component 210 and the second connecting component 220 to move relative to each other, thereby shortening the connecting component 200. Specifically, the content of the above voice commands can be set according to actual conditions.

[0100] In one embodiment, the distance adjustment device further includes a second sensor connected to a controller. The second sensor sends a usage status signal to the controller when the distance adjustment device is in use. Upon receiving the usage status signal, the controller controls the current power input from the power supply module to the shape memory alloy component 3. In this solution, the second sensor can first determine whether the distance adjustment device is currently in use. Only when the distance adjustment device is in use will the controller control the distance adjustment device 230 of the mobile terminal to adjust the length of the connecting component 200, thereby improving the reliability of the distance adjustment device.

[0101] In specific embodiments, the specific type of the second sensor is not limited. It can be a capacitive sensor or an optical sensor, as long as it can detect whether the distance adjustment device is in use.

[0102] Please refer to Figure 4This is a specific embodiment of the distance adjustment device in this application. In this embodiment, the distance adjustment device is eyeglasses, the device body 100 is the lens, and the connecting parts 200 are the frame and temples. The frame can be considered as the first connecting part 210, and the temples as the second connecting parts 220. The aforementioned distance adjustment device 230 is disposed between the temples and the frame, and there is one distance adjustment device 230 between each temple and the frame.

[0103] Figure 5 This is a partial structural diagram of the distance adjustment device in the technical solution of this application. Please refer to it. Figure 4 and Figure 5 In the above technical solution, the distance adjustment device 230 can be used to adjust the distance between the two temples. This means that when the user wears the glasses, they can adjust the tightness between the temples and the side of their head, improving the user's wearing experience. Specifically, the first connecting component 210 and the second connecting component 220 are hinged together, and the mating point is a contact fit between a convex arc surface 270 and a flat surface 280. This allows the linear distance adjustment of the distance adjustment device 230 to be converted into an adjustment of the swing angle. In other words, the temples are hinged to the frame, and the mating point is a contact fit between the convex arc surface 270 and the flat surface 280. Taking the glasses in a wearing state as an example, when the pressure between the temples and the side of the head is low, the distance adjustment device can drive the temples to move relative to the frame. Under the action of the convex arc surface 270, the temples and frame rotate, causing the temples to swing closer to the side of the head, thereby increasing the pressure between the temples and the side of the head. When the pressure between the temple and the side of the head is low, the distance adjustment device can drive the temple and the frame to move towards each other. Under the action of the convex arc surface 270, the temple and the frame rotate, causing the temple to swing away from the side of the head, thereby increasing the pressure between the temple and the side of the head.

[0104] The following are some specific structural embodiments of distance adjustment devices. Figure 6 This is a schematic diagram of a distance adjustment device in one embodiment of this application, such as... Figure 6 As shown, the distance adjustment device includes a first component 1, a second component 2, a first drive unit 4, and a second drive unit 5. The second component 2 is movably mounted on the first component 1, meaning it can move relative to the first component 1, either closer to or further away from it. One end of the first drive unit 4 is fixed to the first component 1, and the other end can drive the second component 2 to move relative to the first component 1 in a first direction. One end of the second drive unit 5 is fixed to the first component 1, and the other end can drive the second component 2 to move relative to the first component 1 in a second direction, opposite to the first direction.

[0105] Specifically, the first driving unit 4 includes a first shape memory alloy component 41. When the temperature of the first shape memory alloy component 41 is below a set threshold, the first shape memory alloy component 41 is in a first state; when the temperature of the first shape memory alloy component 41 is above the set threshold, the first shape memory alloy component 41 is in a second state. It can be understood that the shape of the first shape memory alloy component 41 can change with temperature. That is, as the temperature changes around the set threshold, the first shape memory alloy component 41 changes from one shape to another. Since one end of the first shape memory alloy component 41 is relatively fixed to the first component 1, during the deformation process, the other end of the first shape memory alloy component 41 can drive the second component 2 to move relative to the first component 1. The first memory alloy component 41 is connected to two electrodes, which can be used to connect the first memory alloy component 41 to a circuit. That is, current can be input to the first memory alloy component 41, which will cause the temperature of the first memory alloy component 41 to change. By controlling the magnitude or switching of the current, the first memory alloy component 41 can be controlled to be in a first state or a second state. In this way, the first memory alloy component 41 can change between the first state and the second state, thereby driving the second component 2 to move relative to the first component 1 in a first direction.

[0106] The second driving unit 5 is similar to the first driving unit 4. One end of the second driving unit 5 is fixed to the first component 1, and the other end drives the second component 2 to move relative to the first component 1 in a second direction. The first direction is opposite to the second direction, that is, the first driving unit 4 and the second driving unit 5 drive the second component 2 to move relative to the first component 1 in opposite directions. The second driving unit 5 also includes a second shape memory alloy component 51. When the temperature of the second shape memory alloy component 51 is lower than a set threshold, the second shape memory alloy component 51 is in a second state; when the temperature of the second shape memory alloy component 51 is higher than the set threshold, the second shape memory alloy component 51 is in a first state. The second shape memory alloy component 51 is connected to two electrodes, and the second shape memory alloy component 51 of the second driving unit 5 can change between the first state and the second state, driving the second component 2 to move relative to the first component 1 in a second direction. This second shape memory alloy component 51 is also similar to the first shape memory alloy component 41, and will not be described in detail here.

[0107] In this application, the shape memory alloy component 3 is made conductive, and its shape can change after the current affects its temperature. This component is then used in a distance adjustment device to drive the second component 2 to move relative to the first component 1 by utilizing the deformation of the shape memory alloy component 3. Specifically, the distance adjustment device includes a first driving unit 4 and a second driving unit 5, which can respectively drive the second component 2 to move relative to the first component 1 in two opposite directions, a first direction and a second direction. This allows the distance adjustment device to adjust the length of the connecting component 200 by shortening or increasing it. In this solution, an electrical signal can be used to control the distance adjustment device to adjust the length of the connecting component 200, allowing the mobile terminal to be positioned in a more suitable location, improving the working efficiency of the mobile terminal and enhancing user comfort. Furthermore, this application can achieve a small stroke adjustment of the connecting component 200's length, almost reaching stepless adjustment, thus overcoming the problem in existing technologies where large fixed-step adjustment methods make it difficult to achieve a comfortable length for the connecting component 200. For example, if a watch strap has multiple through holes arranged in sequence, with a fixed interval between each through hole, and each time the length of the watch strap is adjusted, at least the length of the aforementioned fixed interval must be adjusted, this application does not have this problem.

[0108] Figure 7 This is a schematic diagram of the shape memory alloy component in the embodiments of this application, such as... Figure 7 As shown, the aforementioned shape memory alloy component 3 is also fixedly stacked with an elastic material layer 31. Specifically, the first shape memory alloy component 41 of the first driving part 4 is fixedly stacked with an elastic material layer 31, and the second shape memory alloy component 51 of the second driving part 5 is also fixedly stacked with an elastic material layer 31. In this scheme, both the first shape memory alloy component 41 and the second shape memory alloy component 51 have an elastic material layer 31. The elastic material layer 31 is made of a high-toughness material and has a certain elasticity. Specifically, it can be used to provide a restoring force after the first shape memory alloy component 41 and the second shape memory alloy component 51 are deformed. When the driving force for the deformation of the first shape memory alloy component 41 and the second shape memory alloy component 51 is weakened or disappears, that is, when the temperature is lower than a set threshold, the elastic material layer 31 drives the first shape memory alloy component 41 and the second shape memory alloy component 51 to quickly return to their original state, so as to facilitate the next deformation of the first shape memory alloy component 41 and the second shape memory alloy component 51.

[0109] The first memory alloy component 41 and the second memory alloy component 51 can be made of nickel-titanium memory alloy. Through temperature and shape matching design, the first memory alloy component 41 and the second memory alloy component 51 can deform at a set temperature. The elastic material layer 31 is an elastic material layer made of a high-toughness material. The high-toughness material can be an organic material such as photosensitive epoxy resin (SU-8), or a high-strength material such as copper, steel, or iron. That is, the elastic material layer 31 can be a photosensitive epoxy resin elastic material layer, a copper elastic material layer, or a steel or iron elastic material layer.

[0110] Figure 8 This is a partial schematic diagram of the distance adjustment device in an embodiment of this application, such as... Figure 8 As shown, the distance adjustment device may include multiple first drive units 4 and multiple second drive units 5. The multiple first drive units 4 simultaneously drive the second component 2 to move relative to the first component 1. This allows the structure of the first drive units 4 to be designed to be smaller while still possessing sufficient driving force. Consequently, the second drive units 5 can adjust the movement of the second component 2 relative to the first component 1 in smaller steps each time, tending towards stepless adjustment. The second drive units 5 can also be designed to be smaller, which will not be elaborated here. In essence, the first drive units 4 and second drive units 5 can be of the same size or even have different structures, using different fixing methods to achieve driving in different directions.

[0111] The first shape memory alloy components 41 of the multiple first driving units 4 can share a set of electrodes. That is, a single power supply device can simultaneously power multiple first shape memory alloy components 41, causing them to deform simultaneously. This simplifies the control process of the distance adjustment device and increases the driving force of the first driving unit 4. Similarly, the second shape memory alloy components 51 of the multiple second driving units 5 can share a set of electrodes. This also allows a single power supply device to simultaneously power multiple second shape memory alloy components 51, causing them to deform simultaneously. This simplifies the control process of the distance adjustment device and increases the driving force of the second driving unit 5. The specific placement of the electrodes is not limited and can be determined according to the actual structure.

[0112] Figure 9 This is a schematic cross-sectional view of one embodiment of the distance adjustment device in this application. Figure 10 This is a schematic diagram of another cross-sectional structure of the distance adjustment device in an embodiment of this application, wherein, Figure 9 and Figure 10 The cross-section is perpendicular to the first direction. Please refer to... Figure 9 and Figure 10The second component 2 is located between the first driving part 4 and the second driving part 5. That is, the first driving part 4 and the second driving part 5 are located on opposite sides of the second component 2. Thus, the first driving part 4 on one side of the second component 2 drives the second component 2 to move relative to the first component 1 in a first direction, and the second driving part 5 on the other side of the second component 2 drives the second component 2 to move relative to the first component 1 in a second direction. This design helps reduce the area occupied by the distance adjustment device, and the oppositely positioned first driving part 4 and second driving part 5 can also cooperate with each other. In this design, the first component 1 can be U-shaped, such as... Figure 7 As shown; or, the first component 1 mentioned above can also be tubular, such as Figure 8 As shown, the second component 2 passes through the middle of the first component 1. Of course, the first component 1 can also be any structure that allows the first driving part 4 and the second driving part 5 to be disposed on both sides of the second component 2, and this application does not impose any restrictions.

[0113] Figure 11 This is a schematic diagram of the operation process of the first driving unit in an embodiment of this application. Please refer to it. Figure 11 The distance adjustment device also includes an auxiliary part 6, which is disposed between the second component 2 and the first component 1. When the auxiliary part 6 is in the first state, the first driving part 4 or the second driving part 5 can contact the second component 2, thereby driving the second component 2 to move relative to the first component 1. When the auxiliary part 6 is in the second state, there is a gap between the first driving part 4 or the second driving part 5 and the second component 2, so it cannot contact the second component 2 and therefore cannot generate driving force on the second component 2. The aforementioned first shape memory alloy component 41 bends in the second direction in the first form and in the first direction in the second form. When the first shape memory alloy component 41 is in the first or second form, it cannot contact the second component 2. However, when the first shape memory alloy component 41 changes from the first form to the second form, it needs to straighten during the transition. At this time, the auxiliary part 6 is in the first state, and the first shape memory alloy component 41 will contact the second component 2. Specifically, when the temperature of the first shape memory alloy component 41 is lower than a set threshold, the first shape memory alloy component 41 is in the first form, that is, the first shape memory alloy component 41 bends in the second direction, such as... Figure 11 As shown in (a); when the first shape memory alloy component 41 is energized, as the temperature rises above the aforementioned set threshold, the first shape memory alloy component 41 changes from a first state to a second state. That is, the first shape memory alloy component 41 deforms from bending in the second direction to bending in the first direction. The auxiliary part 6 is in the first state, and the first shape memory alloy component 41 can abut against the second component 2 during the deformation process, and generate a frictional force on the second component 2 in the first direction, such as... Figure 11As shown in (b), the second component 2 is driven to move in the first direction; then, the first shape memory alloy component 41 bends in the first direction, as shown in (b). Figure 11 As shown in (c); when the current in the first shape memory alloy component 41 decreases or is de-energized, the temperature of the first shape memory alloy component 41 decreases. When it falls below a set threshold, the first shape memory alloy component 41 changes from the second form to the first form, that is, from bending towards the first direction to bending towards the second direction. At this time, the auxiliary part 6 is in the second state. During the deformation process, there is also a certain gap between the first shape memory alloy component 41 and the second component 2, such as... Figure 11 As shown in (d), therefore, no driving force is generated in the second direction, thus ensuring that the first driving unit 4 can only drive the second component 2 to move relative to the first component 1 in the first direction; afterwards, the first shape memory alloy component 41 returns to the first shape, as shown in (d). Figure 11 As shown in (e). Thus, the first shape memory alloy component 41 completes one deformation, and the second component 2 moves a small distance relative to the first component 1 in the first direction. Depending on the requirements, controlling the current within the first shape memory alloy component 41, for example, by inputting a square wave current, can cause the first shape memory alloy component 41 to deform multiple times, driving the second component 2 to move relative to the first component 1 to a suitable position.

[0114] Figure 12 This is a schematic diagram of the operation process of the second drive unit in an embodiment of this application, such as... Figure 12 As shown in (a) to (e), the deformation process of the second shape memory alloy component 51 of the second drive unit 5 is the opposite of the deformation process of the first shape memory alloy component 41. The second shape memory alloy component 51 bends in the second direction in the first form and in the first direction in the second form. When the second shape memory alloy component 51 is in the second or first form, it cannot contact the second component 2. However, when the second shape memory alloy component 51 changes from the second form to the first form, it needs to straighten during the transition. At this time, the auxiliary part 6 is in the first state, and the second shape memory alloy component 51 will contact the second component 2. Specifically, when the temperature of the second shape memory alloy component 51 is lower than a set threshold, the second shape memory alloy component 51 is in the second form, that is, the second shape memory alloy component 51 bends in the first direction, such as... Figure 12 As shown in (a); when the second shape memory alloy component 51 is energized, as the temperature rises above the aforementioned set threshold, the second shape memory alloy component 51 changes from the second form to the first form. That is, the second shape memory alloy component 51 deforms from bending in the first direction to bending in the second direction. The auxiliary part 6 is in the first form, and the second shape memory alloy component 51 can abut against the second component 2 during the deformation process, and generate a frictional force on the second component 2 in the second direction, such as... Figure 12As shown in (b), the second component 2 is driven to move in the second direction; subsequently, the second shape memory alloy component 51 bends in the second direction, as shown in (b). Figure 12 As shown in (c); when the current in the second shape memory alloy component 51 decreases or is de-energized, the temperature of the second shape memory alloy component 51 decreases. When it falls below a set threshold, the second shape memory alloy component 51 changes from the first form to the second form, that is, from bending towards the second direction to bending towards the first direction. At this time, the auxiliary part 6 is in the second state. During the deformation process, there is also a certain gap between the second shape memory alloy component 51 and the second component 2, such as... Figure 12 As shown in (d), therefore, no driving force is generated in the first direction, thus ensuring that the second driving unit 5 can only drive the second component 2 to move in the second direction relative to the first component 1; afterwards, the second shape memory alloy component 51 returns to the second form, as shown in (d). Figure 12 As shown in (e), the second shape memory alloy component 51 undergoes one deformation, and the second component 2 moves a small distance relative to the first component 1 in the second direction. Depending on the requirements, controlling the current within the second shape memory alloy component 51, for example, by inputting a square wave current, can cause the second shape memory alloy component 51 to undergo multiple deformations, thereby driving the second component 2 to move relative to the first component 1 to a suitable position. This embodiment shows a configuration where the first driving unit 4 and the second driving unit 5 are disposed on both sides of the second component 2.

[0115] In this technical solution, the distance adjustment device can generate a driving force in the first direction and a driving force in the second direction for the second component 2. Both directions can be actively adjusted, which means that the connecting component 200 can be adjusted to extend or retract. It has a wide range of applications and a good user experience.

[0116] Figure 13 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application. Please refer to... Figure 13The first driving part 4 and the second driving part 5 can be disposed on the same side of the second component 2. In this case, the auxiliary part 6 is disposed, with one end fixed to the first component 1 and the other end facing the second component 2. When the auxiliary part 6 is in the first state, its length along the direction from the first component 1 to the second component 2 is a first length, and the first driving part 4 and the second driving part 5 can contact the second component 2. When the auxiliary part 6 is in the second state, its length along the direction from the first component 1 to the second component 2 is a second length, which is greater than the first length. In this state, the auxiliary part 6 can drive the second component 2 to move away from the surface of the first component 1, creating a gap between the first driving part 4, the second driving part 5, and the second component 2. Therefore, regardless of how the first shape memory alloy component 41 and the second shape memory alloy component 51 deform, they will not exert any force on the second component 2, thus allowing the first shape memory alloy component 41 and the second shape memory alloy component 51 to exert a force in one direction on the second component 2 respectively.

[0117] In another embodiment, please refer to Figure 12 The second component 2 is located between the first driving part 4 and the second driving part 5. One end of the auxiliary part 6 is fixed to the first component 1, and the other end faces the second component 2. Specifically, the auxiliary part 6 includes a first auxiliary part and a second auxiliary part. The first auxiliary part is located on the same side as the first driving part 4 and operates in conjunction with the first driving part 4. The second auxiliary part is located on the same side as the second driving part 5 and operates in conjunction with the second driving part 5. Specifically, when the first auxiliary part is in the first state, the length of the first auxiliary part along the direction from the first component 1 to the second component 2 is the first length, and the first driving part 4 can contact the second component 2. When the first auxiliary part is in the second state, the length of the first auxiliary part along the direction from the first component 1 to the second component 2 is the second length, which is greater than the first length. At this time, the first auxiliary part can drive the second component 2 to move away from the first driving part 4. There is a gap between the first driving part 4 and the second component 2. Therefore, when the first shape memory alloy component 41 changes from the second state to the first state, the first shape memory alloy component 41 will not generate a driving force on the second component 2. Similarly, when the second auxiliary part is in the first state, the length of the first auxiliary part along the direction from the first component 1 toward the second component 2 is the first length, and the second driving part 5 can contact the second component 2; when the first auxiliary part is in the second state, the length of the second auxiliary part along the direction from the first component 1 toward the second component 2 is the second length, and the second length is greater than the first length. At this time, the second auxiliary part can drive the second component 2 to move away from the second driving part 5. There is a gap between the first driving part 4 and the second component 2. When the second shape memory alloy component 51 changes from the first state to the second state, the second shape memory alloy component 51 will not generate a driving force on the second component 2.

[0118] Please continue to refer to this. Figure 11 and Figure 12 Specifically, when the auxiliary part 6 is configured, it includes a first shape memory alloy spring 61. The first shape memory alloy spring 61 is connected to two electrodes, which can be connected to a circuit to control its temperature via current. Specifically, when the temperature of the first shape memory alloy spring 61 is below a set threshold, it is not energized or has a small current flow, and is at its first length; the auxiliary part 6 is in a first state. When the temperature of the first shape memory alloy spring 61 is above the set threshold, it is energized or has a large current flow, and extends towards the second component 2 to a second length greater than the first length. The auxiliary part 6 is in a second state, and the first shape memory alloy spring 61 can drive the second component 2 to move away from the surface of the first component 1. In this scheme, the deformation of the first memory alloy spring 61 can be controlled by controlling the current in the first memory alloy spring 61. Specifically, the square wave of the current in the first memory alloy spring 61 and the current in the first driving part 4 or the second driving part 5 used with it can be opposite. That is, when the current in the first driving part 4 or the second driving part 5 is large, the current in the corresponding first memory alloy spring 61 is small or there is no current; when the current in the first driving part 4 or the second driving part 5 is small or there is no current, the current in the corresponding first memory alloy spring 61 is large.

[0119] Please continue to refer to this. Figure 11 and Figure 12 The auxiliary part 6 also includes a first return spring 62, which can be a regular spring. The first return spring 62 is arranged parallel to the first shape memory alloy spring 61. When the first shape memory alloy spring 61 is at its first length, the first return spring 62 is in a released state, and at this time, the first return spring 62 exerts no force on the first shape memory alloy spring 61. When the first shape memory alloy spring 61 is at its second length, the first return spring 62 is in a stored state. Therefore, when the current to the first shape memory alloy spring 61 decreases or disconnects, the first shape memory alloy spring 61 can quickly return to its first state, i.e., its first length, under the action of the first return spring 62. This design helps to reduce the influence of the first shape memory alloy spring 61 on the position of the second component 2. It facilitates the rapid execution of the next operating cycle of the first drive unit 4 and the second drive unit 5, thereby improving the adjustment efficiency of the distance adjustment device.

[0120] In addition, please continue to refer to Figure 11 and Figure 12To increase the frictional force and improve driving efficiency when the first driving unit 4 and the second driving unit 5 drive the second component 2, an elastic layer 7 can be provided at one end of the first driving unit 4 facing the second component 2, and an elastic layer 7 can be provided at the other end of the second driving unit 5 facing the second component 2. Specifically, the elastic layer 7 can be made of copper or iron. Compared to the material of the shape memory alloy component 3, the elastic layer 7 has greater elasticity and can generate greater frictional force with the second component 2, thereby facilitating the movement of the second component 2 relative to the first component 1 by the first driving unit 4 and the second driving unit 5.

[0121] Figure 14 This is a schematic diagram of the operation process of the first driving unit in an embodiment of this application. Please refer to it. Figure 14 When the first shape memory alloy component 41 is not energized or has a small amount of energized power, the first shape memory alloy component 41 is in a first state. Specifically, the first shape memory alloy component 41 is parallel to a first direction, such as... Figure 14 As shown in (a); when the current carrying capacity is large, the first shape memory alloy component 41 is in the second form. Specifically, the second shape memory alloy component 51 is bent in the direction away from the second component 2, as shown in (a). Figure 14 As shown in (b) above. Specifically, the first shape memory alloy component 41 includes a first end 411 and a second end 412 distributed along a second direction, that is, the second end 412 is located in the second direction of the first end 411, and the first end 411 is fixed to the first component 1. The first driving part 4 also includes a first linkage rod 42, which includes a third end 421 and a fourth end 422 distributed along the second direction, that is, the fourth end 422 is located in the second direction of the third end 421. The second end 412 and the fourth end 422 are rotatably connected, so the first linkage rod 42 can rotate relative to the first shape memory alloy component 41. The second end 412 is fixed with a first baffle 43. When the first shape memory alloy component 41 changes from the second form to the first form, the fourth end 422 abuts against the first baffle 43, the third end 421 abuts against the second component 2, and the third end 421 drives the second component 2 to move in the first direction. Specifically, when the first shape memory alloy component 41 is not powered, it is in a first state, that is, the first shape memory alloy component 41 is parallel to a first direction, such as... Figure 14 As shown in (a); when the current carrying capacity is large, the first shape memory alloy component 41 changes from the first shape memory alloy component 41 to the second shape memory alloy component 41, that is, the first shape memory alloy component 41 bends in the direction away from the second component 2, as shown in (a); Figure 14As shown in (b), during this process, since the first linkage rod 42 is rotatably connected to the first shape memory alloy component 41, the friction between the first linkage rod 42 and the second component 2 is small, and the second component 2 will not move in the second direction. Afterwards, the current carrying capacity of the first shape memory alloy component 41 decreases or is de-energized, and the first shape memory alloy component 41 changes from the second form to the first form, that is, the first shape memory alloy component 41 changes from a bent state to a straight state. At this time, the fourth end 422 of the first linkage rod 42 abuts against the first baffle 43, and the third end 421 abuts against the second component 2, generating a large friction force. Therefore, the first driving unit 4 can drive the second component 2 to move relative to the first component 1 in the first direction, as shown in (b). Figure 14 As shown in (c); afterwards, the first shape memory alloy component 41 returns to the first configuration, as shown in (c). Figure 14 As shown in (d) in the diagram. Thus, the first shape memory alloy component 41 completes one deformation, and the second component 2 moves a small distance relative to the first component 1 in the first direction. Depending on the requirements, controlling the current within the first shape memory alloy component 41, for example, by inputting a square wave current, can cause the first shape memory alloy component 41 to deform multiple times, thereby driving the second component 2 to move relative to the first component 1 to a suitable position.

[0122] Figure 15 This is a schematic diagram of the operation process of the second drive unit in an embodiment of this application. Please refer to it. Figure 15 When the second shape memory alloy component 51 is not energized or has a small amount of energized power, the temperature of the second shape memory alloy component 51 is below a set threshold, and the second shape memory alloy component 51 is in a first state. Specifically, the second shape memory alloy component 51 is parallel to the first direction, such as... Figure 15 As shown in (a); when the current carrying capacity is large, the temperature of the second shape memory alloy component 51 is higher than a set threshold, and the second shape memory alloy component 51 is in a second state. Specifically, the second shape memory alloy component 51 bends in a direction away from the second component 2, as shown in (a). Figure 15As shown in (b) above. Specifically, the second shape memory alloy component 51 includes a fifth end 511 and a sixth end 512 distributed along the second direction, that is, the sixth end 512 is located in the second direction of the fifth end 511, and the sixth end 512 is fixed to the first component 1. The second driving part 5 also includes a second linkage rod 52, which includes a seventh end 521 and an eighth end 522 distributed along the second direction, that is, the eighth end 522 is located in the second direction of the seventh end 521. The fifth end 511 is rotatably connected to the seventh end 521, so the second linkage rod 52 can rotate relative to the second shape memory alloy component 51. The fifth end 511 is fixed with a second baffle 53. When the second shape memory alloy component 51 changes from the second form to the first form, the seventh end 521 abuts against the second baffle 53, the eighth end 522 abuts against the second component 2, and the eighth end 522 drives the second component 2 to move in the second direction. Specifically, when the second shape memory alloy component 51 is not energized, it is in a first state, meaning it is parallel to a first direction, such as... Figure 15 As shown in (a); when the current carrying capacity is large, the second shape memory alloy component 51 changes from the first form to the second form, that is, the second shape memory alloy component 51 bends in the direction away from the second component 2, as shown in (a); Figure 15 As shown in (b), during this process, since the second linkage rod 52 is rotatably connected to the second shape memory alloy component 51, the friction between the second linkage rod 52 and the second component 2 is small, and the second component 2 will not move in the second direction. Afterwards, the current carrying capacity of the second shape memory alloy component 51 decreases or is de-energized, and the second shape memory alloy component 51 changes from the second form to the first form, that is, the second shape memory alloy component 51 changes from a bent state to a straight state. At this time, the seventh end 521 of the second linkage rod 52 abuts against the second baffle 53, and the eighth end 522 abuts against the second component 2, generating a large friction force. Therefore, the second driving unit 5 can drive the second component 2 to move in the second direction relative to the first component 1. Figure 15 As shown in (c); afterwards, the second shape memory alloy component 51 returns to the first configuration, as shown in (c). Figure 15 As shown in (d) in the diagram. Thus, the second shape memory alloy component 51 completes one deformation, and the second component 2 moves a small distance relative to the first component 1 in the second direction. Depending on the requirements, controlling the current within the second shape memory alloy component 51, for example, by inputting a square wave current, can cause the second shape memory alloy component 51 to deform multiple times, thereby driving the second component 2 to move relative to the first component 1 to a suitable position.

[0123] In addition, please continue to refer to Figure 14 and Figure 15To increase the frictional force and improve driving efficiency when the first driving unit 4 and the second driving unit 5 drive the second component 2, an elastic layer 7 can be provided at the end of the first driving unit 4 facing the second component 2, that is, the third end 421 of the first linkage rod 42 has an elastic layer 7. An elastic layer 7 is also provided at the end of the second driving unit 5 facing the second component 2, that is, the eighth segment of the second linkage rod 52 also has an elastic layer 7. Specifically, the elastic layer 7 can be made of copper or iron. Compared with the material of shape memory alloy components, the elastic layer 7 has greater elasticity and can generate greater frictional force with the second component 2, thereby facilitating the movement of the second component 2 relative to the first component 1 by the first driving unit 4 and the second driving unit 5.

[0124] Figure 16 This is a schematic diagram of one embodiment of the stop structure in this application. Please refer to it. Figure 16 The distance adjustment device also includes a stop structure 8, which is disposed between the first component 1 and the second component 2. When the stop structure 8 is in a first state, the second component 2 can move relative to the first component 1, meaning the distance adjustment device can adjust the distance between the first component 1 and the second component 2. When the stop structure 8 is in a second state, it is fixedly connected to the second component 2 and the first component 1, meaning the second component 2 and the first component 1 cannot move relative to each other, and the distance adjustment device cannot adjust the distance between them. Therefore, when the connecting component 200 of the distance adjustment device needs to be adjusted in length, the stop structure 8 is in the first state, and the length of the connecting component 200 is adjusted using the distance adjustment device. When the distance adjustment device adjusts the length of the connecting component 200 to meet the usage requirements, the stop structure 8 is in the second state, thereby keeping the connecting component 200 at the required length.

[0125] Figure 17 This is a cross-sectional view of the stop structure in one embodiment of this application. Please refer to the diagram below. Figure 16 and Figure 17 In the specific design of the aforementioned stop structure 8, a shape memory alloy structure 85 can also be used in the stop structure 8 to realize the operation of the electrically driven stop structure 8, so that the stop structure 8 can be controlled by the controller to achieve the stopping function after the position adjustment device has completed the adjustment. For example Figure 16As shown, the aforementioned stop structure 8 includes a gear 81, a rack 82, a locking element 83, an elastic element 84, and a shape memory alloy structure 85. The gear 81 and rack 82 are adapted to each other, allowing the gear 81 to mesh and roll on the rack 82. The rack 82 is fixed to the first component 1, and the shaft 811 of the gear 81 is fixedly mounted to the second component 2. Specifically, the gear 81 and the shaft 811 are rotatably connected. That is, when the gear 81 rotates, the shaft 811 does not rotate, but during the rotation of the gear 81, it moves relative to the rack 82. At this time, the shaft 811 can move with the gear 81, thereby driving the second component 2 to move relative to the first component 1. If the gear 81 cannot rotate, the shaft 811 cannot move with the gear 81, and the first component 1 and the second component 2 remain relatively fixed, achieving the stop function.

[0126] The locking member 83 of the aforementioned stop structure 8 can engage with the gear 81. The shape memory alloy structure 85 is connected between the locking member 83 and the second component 2, and the elastic member 84 is also disposed between the locking member 83 and the second component 2. When no current is passed through the shape memory alloy structure 85 or the current is small, the temperature of the shape memory alloy structure 85 can be lowered below a set threshold, and the shape memory alloy structure 85 is in the first state, with the locking member 83 engaging with the gear 81. At this time, the elastic member 84 drives the locking member 83 to engage with the gear 81, so that the driving force of the first driving part 4 or the driving force of the second driving part 5 cannot overcome the engaging effect of the locking member 83, and the first component 1 and the second component 2 can be reliably in the stop state. When a certain current is passed through the shape memory alloy structure 85, the temperature of the shape memory alloy structure 85 can be higher than the aforementioned set threshold, and the shape memory alloy... When structure 85 is in its second state, it can drive the locking piece 83 to move away from gear 81. At this time, the locking piece 83 disengages from gear 81, and gear 81 can mesh with rack 82. The distance adjustment device can drive the second component 2 to move relative to the first component 1, and the elastic element 84 is in an energy storage state. When the current in the shape memory alloy structure 85 decreases or is cut off, the temperature of the shape memory alloy structure 85 decreases. When the temperature of the shape memory alloy structure 85 is lower than the above-mentioned set threshold, under the action of the elastic element 84 in the energy storage state, the locking piece 83 moves toward gear 81 and engages with gear 81, thereby realizing the stopping function of the stop structure 8.

[0127] In another embodiment, the rack 82 can be fixedly mounted on the second component 2, and the shaft 811 of the gear 81 can be fixedly mounted on the first component 1; the elastic element 84 is disposed between the locking element 83 and the first component 1, and the shape memory alloy structure 85 is connected between the locking element 83 and the first component 1. In summary, the elastic element 84, the shape memory alloy structure 85, and the gear 81 are disposed on the same component, either all on the first component 1 or all on the second component 2. The startup process is similar and will not be described in detail here.

[0128] Please continue to refer to this. Figure 16 In a specific embodiment, it may include two sets of synchronously moving gears 81 and racks 82, that is, two gears 81 and two racks 82. The locking member 83 can engage with the two gears 81 at the same time, thereby enabling the stop structure 8 to have better stability.

[0129] In specific embodiments, the specific structure of the aforementioned shape memory alloy structure 85 is not limited, as long as it can drive the aforementioned card 83 to move. For example... Figure 16 In the embodiment shown, the shape memory alloy structure 85 is a shape memory alloy wire. By controlling the deformation of the shape memory alloy wire, the clip 83 can be pulled to disengage the clip 83 from the gear 81.

[0130] The above embodiments are only specific embodiments. In other embodiments, the stop structure 8 can also be other specific structures, such as bayonet buckle components or cylinder components, etc., as long as they can achieve the stop function.

[0131] Figure 18 This is a schematic diagram of another structure of the distance adjustment device in the embodiments of this application. Figure 19 This is a schematic diagram of a partial structure of a specific adjustment device in an embodiment of this application, such as... Figure 18 and Figure 19 As shown, this application also provides another distance adjustment device. Figure 19 The diagram shows the structure of the device without the stop structure. The distance adjustment device includes a first component 1, a second component 2, a second shape memory alloy spring 44, a second return spring 54, and a stop structure 8. The second component 2 is movably mounted on the first component 1, meaning it can move relative to the first component 1, either closer to or further away from it. The second shape memory alloy spring 44 corresponds to the first drive unit 4, and the second return spring 54 corresponds to the second drive unit 5.

[0132] The second shape memory alloy spring 44 can drive the second component 2 to move relative to the first component 1 in a first direction, and the second return spring 54 can drive the second component 2 to move relative to the first component 1 in a second direction, the first direction being opposite to the second direction. Specifically, one end of the second shape memory alloy spring 44 is connected to the first component 1, and the other end is connected to the second component 2. The second shape memory alloy spring 44 is connected to two electrodes, which can be connected to a circuit. When a certain current is passed through the second shape memory alloy spring 44, its temperature can be increased, causing it to deform and drive the first component 1 to move relative to the first component 1 in the first direction. The second return spring 54 is also connected to the first component 1 at one end and the second end to the second component 2 at the other end. After the second shape memory alloy spring 44 increases in temperature and drives the second component 2 to move relative to the first component 1 in the first direction, the second return spring 54 can drive the second component 2 to move relative to the first component 1 in a second direction, the first direction being opposite to the second direction. The aforementioned stop structure 8 is disposed between the first component 1 and the second component 2. When the stop structure 8 is in its first state, the second component 2 can move relative to the first component 1, meaning the distance adjustment device can adjust the distance between the first component 1 and the second component 2. When the stop structure 8 is in its second state, the stop structure 8 is fixedly connected to the second component 2 and the first component 1, meaning the second component 2 and the first component 1 cannot move relative to each other, and the distance adjustment device cannot drive the distance between the first component 1 and the second component 2. Therefore, when the connecting component 200 of the distance adjustment device needs to be adjusted in length, the stop structure 8 is in its first state, and the length of the connecting component 200 is adjusted using the distance adjustment device. When the distance adjustment device adjusts the length of the connecting component 200 to meet the usage requirements, the stop structure 8 is placed in its second state, thereby keeping the connecting component 200 at the required length.

[0133] The working process of the distance adjustment device described above is described below. In a specific embodiment, when no current is applied to the second memory alloy spring 44 or the current is small, the temperature of the second memory alloy spring 44 is lower than the set threshold, and the second memory alloy spring 44 is at its first length. At this time, the distance adjustment device is considered to be in its initial state; the stop structure 8 is in the first state. When a certain amount of current is applied to the second memory alloy spring 44, the temperature of the second memory alloy spring 44 rises. When the temperature of the second memory alloy spring 44 is higher than the set threshold, the second memory alloy spring 44 stretches and deforms along the first direction to a second length. The second length is different from the first length. Therefore, the second memory alloy spring 44 can... The second component 2 moves relative to the first component 1 in a first direction. When the second component 2 moves to a set position relative to the first component 1 in the first direction, the stop structure 8 can switch to a second state, fixing the second component 2 relative to the first component 1. At this time, the second memory alloy spring 44 can be de-energized. When it is necessary to move the second component 2 relative to the first component 1 in a second direction, the stop structure 8 switches to the first state, and the second return spring 54 drives the second component 2 to move relative to the first component 1 in a second direction. When the second component 2 moves to a set position relative to the first component 1 in the second direction, the stop structure 8 can switch to the second state, fixing the second component 2 relative to the first component 1. Through the cooperation of the second memory alloy spring 44, the second return spring 54, and the stop structure 8, the connecting component 200 can be kept at a suitable length.

[0134] The aforementioned second shape memory alloy spring 44 can be disposed between the first component 1 and the second component 2, that is, a set of second shape memory alloy springs 44 and a second return spring 54 are used to drive the second component 2 to move relative to or towards the first component 1. Depending on the installation position of the second shape memory alloy spring 44, it can provide a pushing force to the second component 2, in which case the second length is greater than the first length; alternatively, it can provide a pulling force to the second component 2, in which case the second length is less than the first length. This application does not impose any limitations on this.

[0135] In another embodiment, the distance adjustment device may include two sets of second shape memory alloy springs 44 and second reset springs 54, with the two sets of second shape memory alloy springs 44 and second reset springs 54 symmetrically arranged at both ends of the second component 2. Specifically, the second component 2 includes a first end and a second end, with one set of second shape memory alloy springs 44 and second reset springs 54 connected to the first end, and the other set of second shape memory alloy springs 44 and second reset springs 54 connected to the second end. In this scheme, the first component 1 of the specific adjustment device can be considered to include two parts, namely a first part and a second part, with the second component 2 disposed between the first part and the second part of the first component 1. Specifically, the second component 2 is connected to the first part by one set of second shape memory alloy springs 44 and second reset springs 54, and the second component 2 is connected to the second part by another set of second shape memory alloy springs 44 and second reset springs 54. In this scheme, the second component 2 can be driven to move relative to or towards the first component 1 using two sets of driving structures. In actual operation, the second shape memory alloy springs 44 at both ends of the second component 2 simultaneously drive the second component 2 to move. For example, one set of second shape memory alloy springs 44 extends to provide a pushing force, while the other set of second shape memory alloy springs 44 contracts to provide a pulling force. The operation of the second reset spring 54 is similar. When the second reset spring 54 drives the second component 2 to reset, one set of second reset springs 54 at both ends of the second component 2 provides a pushing force, while the other set of second reset springs 54 provides a pulling force.

[0136] The specific structure of the second return spring 54 is not limited; it can be a regular spring. After the second component 2 moves under the drive of the second shape memory alloy spring 44, the regular spring can store energy to drive the second component 2 to move in a second direction relative to the first component 1. Alternatively, the second return spring 54 can be made of shape memory alloy material. This shape memory alloy second return spring 54 can include two electrodes for passing current, causing the shape memory alloy second return spring 54 to deform and drive the second component 2 to move in a second direction relative to the first component 1. In this scheme, the second return spring 54 can also be made of shape memory alloy material, thereby controlling the operation of the second return spring 54 with an electrical signal. That is, the movement of the second component 2 relative to the first component 1 in both directions can be controlled by an electrical signal, which is beneficial to improving the controllability of the distance adjustment device.

[0137] Please refer to Figure 18In the specific configuration of the aforementioned distance adjustment device, the distance adjustment device further includes a first guide member 9, which extends along a first direction. The second return spring 54 and the second shape memory alloy spring 44 are mounted on the first guide member 9. The first guide member 9 provides guidance for the second return spring 54 and the second shape memory alloy spring 44, thereby improving the reliability of the direction of their extension and contraction. In other words, it ensures that the second shape memory alloy spring 44 extends and contracts along both the first and second directions, and that the second return spring 54 extends and contracts along both directions, preventing distortion and thus improving the stability of the distance adjustment device.

[0138] The total number of the aforementioned second shape memory alloy springs 44 and second return springs 54 is at least three. For example, it may include two second shape memory alloy springs 44 and one second return spring 54, one second shape memory alloy spring 44 and two second return springs 54, two second shape memory alloy springs 44 and two second return springs 54, or two second shape memory alloy springs 44 and three second return springs 54, etc. This application does not list them all. The cooperation of multiple second shape memory alloy springs 44 and second return springs 54 helps improve the reliability of the distance adjustment device, and the second component 2 is less prone to skewness.

[0139] The aforementioned second shape memory alloy springs 44 can share a set of electrodes, meaning that multiple second shape memory alloy springs 44 can be powered by a single power supply, causing them to deform simultaneously. This simplifies the control process of the distance adjustment device. Similarly, when the second return spring 54 is made of shape memory alloy, it also shares a set of electrodes. The specific placement of these electrodes is not limited and can be determined according to the actual structure; for example, they can be placed at one end of the distance adjustment device for easy power connection.

[0140] When the distance adjustment device includes at least three second shape memory alloy springs 44 and second return springs 54, the arrangement of the second shape memory alloy springs 44 and second return springs 54 is not limited. In one embodiment, the second shape memory alloy springs 44 and second return springs 54 are arranged alternately, so the driving force of the second component 2 relative to the first component 1 along the first direction is more uniform, and the driving force of the second component 2 relative to the first component 1 along the second direction is also more uniform. In another embodiment, the second shape memory alloy springs 44 are arranged symmetrically about the axis of symmetry of the second component 2, and the second return springs 54 are arranged symmetrically about the axis of symmetry of the second component 2, with the axis of symmetry extending along the first direction. In this scheme, the driving force of the second component 2 relative to the first component 1 along the first direction is more balanced, and the driving force of the second component 2 relative to the first component 1 along the second direction is also more balanced.

[0141] Please combine Figure 16 and Figure 17 In the specific design of the aforementioned stop structure 8, a shape memory alloy structure 85 can also be used in the stop structure 8 to realize the operation of the electrically driven stop structure 8, so that the stop structure 8 can be controlled by the controller to achieve the stopping function after the position adjustment device has completed the adjustment. For example Figure 16 As shown, the aforementioned stop structure 8 includes a gear 81, a rack 82, a locking element 83, an elastic element 84, and a shape memory alloy structure 85. The gear 81 and rack 82 are adapted to each other, and the gear 81 can mesh and roll on the rack 82. The rack 82 is fixed to the first component 1, and the shaft 811 of the gear 81 is fixedly mounted on the second component 2. Specifically, the gear 81 and the shaft 811 are rotatably connected. That is, when the gear 81 rotates, the shaft 811 does not rotate, but during the rotation of the gear 81, it moves relative to the rack 82. At this time, the shaft 811 can move with the gear 81, thereby driving the second component 2 to move relative to the first component 1. If the gear 81 cannot rotate, the shaft 811 cannot move with the gear 81, and the first component 1 and the second component 2 are relatively fixed, thus achieving the stop.

[0142] The locking member 83 of the aforementioned stop structure 8 can engage with the gear 81. The shape memory alloy structure 85 is connected between the locking member 83 and the second component 2, and the elastic member 84 is also disposed between the locking member 83 and the second component 2. When no current is passed through the shape memory alloy structure 85 or the current is small, the temperature of the shape memory alloy structure 85 can be lowered below a set threshold, and the shape memory alloy structure 85 is in the first state, with the locking member 83 engaging with the gear 81. At this time, the elastic member 84 drives the locking member 83 to engage with the gear 81, so that the driving force of the first driving part 4 or the driving force of the second driving part 5 cannot overcome the engaging effect of the locking member 83, and the first component 1 and the second component 2 can be reliably in the stop state. When a certain current is passed through the shape memory alloy structure 85, the temperature of the shape memory alloy structure 85 can be higher than the aforementioned set threshold, and the shape memory alloy... When structure 85 is in its second state, it can drive the locking piece 83 to move away from gear 81. At this time, the locking piece 83 disengages from gear 81, and gear 81 can mesh with rack 82. The distance adjustment device can drive the second component 2 to move relative to the first component 1, and the elastic element 84 is in an energy storage state. When the current in the shape memory alloy structure 85 decreases or is cut off, the temperature of the shape memory alloy structure 85 decreases. When the temperature of the shape memory alloy structure 85 is lower than the above-mentioned set threshold, under the action of the elastic element 84 in the energy storage state, the locking piece 83 moves toward gear 81 and engages with gear 81, thereby realizing the stopping function of the stop structure 8.

[0143] In another embodiment, the rack 82 can be fixedly mounted on the second component 2, and the shaft 811 of the gear 81 can be fixedly mounted on the first component 1; the elastic element 84 is disposed between the locking element 83 and the first component 1, and the shape memory alloy structure 85 is connected between the locking element 83 and the first component 1. In summary, the elastic element 84, the shape memory alloy structure 85, and the gear 81 are disposed on the same component, either all on the first component 1 or all on the second component 2. The startup process is similar and will not be described in detail here.

[0144] Please refer to Figure 18 In one specific embodiment, a rack 82 surface adapted to the gear 81 can be prepared on the surface of the second component 2 or the first component 1, thereby simplifying the structure of the distance adjustment device.

[0145] The above embodiments are only specific embodiments. In other embodiments, the stop structure 8 can also be other specific structures, such as bayonet buckle components or cylinder components, etc., as long as they can achieve the stop function.

[0146] Based on the same technical concept, this application also provides a control method for the aforementioned specific regulating device. Figure 20 The flowchart of the distance adjustment device control method in the embodiments of this application is shown in the figure. Figure 20 The above control method includes the following steps:

[0147] Step S101: Obtain the positional relationship signal between the connecting component and the user;

[0148] Specifically, the wearable device may include a first sensor, which is capable of monitoring the positional relationship between the wearable device and the user and generating a positional relationship signal. The controller acquires the positional relationship signal and determines, based on the signal, whether the user is comfortable wearing the device or whether the device's operational requirements are met.

[0149] The type of the first sensor is not limited and can be at least one of the following: force sensor, capacitive proximity sensor, ultrasonic distance sensor, laser rangefinder, infrared rangefinder, and light sensor. The appropriate type of first sensor can be selected based on the specific circumstances. Furthermore, there is no limit to the number of first sensors that can be used in a wearable device; a greater number of first sensors can be used to obtain more positional signals, thereby improving the user's comfort when wearing the wearable device.

[0150] Step S102: Determine whether the position relationship signal is within the set range. If yes, proceed to step S103; otherwise, proceed to step S104.

[0151] Step S103: Control the shape memory alloy component to stop working;

[0152] Step S104: Control the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other.

[0153] When the position relationship signal is within the set range, the current state of the connecting components is considered suitable, and the user's comfort in wearing the wearable device is high. At this time, the shape memory alloy component can be controlled to stop working, and the connecting components of the wearable device are fixed at this length. When the position relationship signal is outside the set range, the current state of the connecting components is considered unsuitable, and the user's comfort in wearing the wearable device is poor. Then, the shape memory alloy component is controlled to drive the first component and the second component to move relative to each other or towards each other until the position relationship signal detected by the first sensor is within the set range, allowing the user to wear the wearable device more comfortably.

[0154] In one embodiment, the distance adjustment device can be considered to be used only to adjust the shortening of the connecting parts. For example, if the distance adjustment device is a watch, the watch strap tends to stretch in its natural state. Therefore, the distance adjustment device can be used only to adjust the shortening of the connecting parts.

[0155] In another embodiment, the distance adjustment device can adjust the shortening or lengthening of the connecting component. Specifically, in step S102 above, controlling the distance adjustment device to drive the first component and the second component to move relative to each other or towards each other includes: when the position relationship signal detected by the first sensor is less than a set range, the connecting component is too long, and the shape memory alloy component is controlled to drive the first component and the second component to move relative to each other, thus shortening the connecting component; when the position relationship signal detected by the first sensor is greater than the set range, the connecting component is too short, and the shape memory alloy component is controlled to drive the first component and the second component to move towards each other, thus lengthening the connecting component. When the position relationship signal detected by the first sensor is within the set range, the length of the connecting component is appropriate, and the shape memory alloy component is controlled to stop working, so that the connecting component maintains its current length.

[0156] In specific embodiments, the type of the first sensor is not limited, and therefore the type of position relationship signal is also not limited. For example, the position relationship signal can be a pressure value or a distance value, or it can include both pressure and distance values.

[0157] In other words, taking a force sensor as the first sensor as an example, the positional signal is the pressure value. When the pressure value detected by the first sensor is less than a set range, it is considered that the current connecting component is too long and needs to be shortened. At this time, the shape memory alloy component is controlled to drive the first and second connecting components to move relative to each other, thereby reducing the length of the connecting component. When the pressure value detected by the first sensor is greater than the set range, it is considered that the current connecting component is too short and needs to be lengthened. At this time, the distance adjustment device is controlled to drive the first and second connecting components to move towards each other, thereby increasing the length of the connecting component. When the pressure value detected by the first sensor is within the set range, it is considered that the current length of the connecting component is appropriate. At this time, the shape memory alloy component is controlled to stop working, so that the connecting component maintains its current length.

[0158] The control method described above also acquires a usage status signal of the wearable device before step S101. Specifically, the wearable device further includes a second sensor connected to the controller. The second sensor sends a usage status signal to the controller when the wearable device is in use. After acquiring the usage status signal, the controller controls the current power input from the power supply module to the shape memory alloy component. In this scheme, the second sensor can be used to determine whether the wearable device is currently in use. Only when the wearable device is in use will the controller control the shape memory alloy component of the wearable device to adjust the length of the connecting component, thereby improving the reliability of the wearable device adjusting the length of the connecting component.

[0159] Furthermore, the aforementioned control method may also include self-learning to generate user information, and controlling the shape memory alloy components to drive the first and second components to a set position based on the user information. Taking a wearable device as an earphone as an example, it can self-learn to generate user head shape feature data, and quickly adjust the length of the connecting components based on the user head shape feature data, thereby improving the speed at which the user can adjust the length of the connecting components of the wearable device.

[0160] The following specific embodiments illustrate the above control method. In this embodiment, the wearable device is a pair of headphones, the connecting component is the headband of the headphones, and the shape memory alloy component includes a second return spring and a stop structure. The shape memory alloy component is a second shape memory alloy spring, and the second return spring is a second return spring made of shape memory alloy material. The shape memory alloy component is located on both sides of the headband, near the earcups. In addition, the headband of the headphones is equipped with a force sensor to sense the pressure of the position where the user wears the headphones, thereby controlling the shape memory alloy component to automatically adjust the length of the connecting component. The force sensor is the first sensor. In addition, the headphones also include a second sensor to detect whether the headphones are being worn. This second sensor can be a capacitive sensor. The state of whether the headphones are being worn can be determined by the change in the capacitance value of the capacitive sensor during the process of putting on and taking off the headphones. Optionally, other sensors, such as optical sensors, can also be used for headphone wearing detection.

[0161] When the headphones are in their initial state, the shape memory alloy components on both sides are not powered, and the stop structure fixes the second shape memory alloy spring at the top, thus placing the headband at its highest position. When the second sensor detects that the user is wearing the headphones, the force sensor senses the pressure between the user's head and the headband.

[0162] If the pressure value is not within the set range, the second shape memory alloy spring is activated. Specifically, during initial wear, because the headband is at its highest point, the pressure sensor detects a relatively low pressure value. The second shape memory alloy spring needs to pull the headband downwards, thus shortening its length. At this time, the control stop structure pops out and energizes the second shape memory alloy spring to heat it, thereby pulling the headband downwards. The method for activating the heating of the second shape memory alloy spring is to use power management to control the circuit, including turning the power on and off. Furthermore, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit, thereby improving the heating speed.

[0163] Meanwhile, the pressure sensor on the headband continuously senses the pressure value between the user's head and the headband. When it detects an increase in pressure value that is within a set range, it controls the second shape memory alloy spring to stop working, either by de-energizing the second shape memory alloy spring or reducing its current power; and it controls the stop structure to drop down, locking the current headband position.

[0164] If the force sensor detects a large pressure value between the user's head and the headband, exceeding a set range, it controls the second return spring to push the headband upwards. Specifically, the stop structure pops out, energizing and heating the second return spring to push the headband upwards. The method for energizing and heating the second return spring involves using power management to control the circuit, including turning the power on and off; optionally, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit, thereby improving the heating speed.

[0165] Meanwhile, the force sensor on the headband continuously senses the pressure value between the user's head and the headband. When it detects that the pressure value has decreased and is within the set range, it controls the second return spring to stop working, that is, to cut off the power to the second return spring or reduce the current power; and controls the stop structure to fall down and lock the current headband position.

[0166] Furthermore, when the user removes the headphones, the stop structure can be controlled to release its fixation, and the second return spring can be controlled to push the headband upwards. Once the second return spring has fully extended, the stop structure fixes the headband at its highest position.

[0167] In other embodiments, the control process is similar to the process described above. For example, when the first sensor is a distance sensor, the pressure value is replaced by a distance value.

[0168] Specifically, when the first sensor is a distance sensor, taking a wearable device like a pair of headphones as an example, in this embodiment, the connecting component is the headband of the headphones, and the shape memory alloy component includes a second return spring and a stop structure. The shape memory alloy component is a second shape memory alloy spring, and the second return spring is a second return spring made of shape memory alloy material. The aforementioned shape memory alloy component is located on both sides of the headband, close to the earcups. Furthermore, the headband of the headphones is equipped with a distance sensor to sense the distance between the user's position wearing the headphones and the headband, thereby controlling the shape memory alloy component to automatically adjust the length of the connecting component. This distance sensor is the first sensor. Additionally, the headphones also include a second sensor to detect whether the headphones are being worn. This second sensor can be a capacitive sensor. The change in capacitance value of the capacitive sensor during the wearing and removing of the headphones can determine whether the headphones are being worn. Optionally, other sensors, such as optical sensors, can also be used for headphone wearing detection.

[0169] When the headphones are in their initial state, the shape memory alloy components on both sides are not powered, and the stop structure fixes the second shape memory alloy spring at the top, thus placing the headband at its highest point. The second sensor detects when the user is wearing the headphones, while the distance sensor measures the distance between the user's head and the headband.

[0170] If the distance value is not within the set range, the second memory alloy spring is activated. Specifically, during initial wear, because the headband is at its highest point, the distance sensor detects a relatively large distance, requiring the second memory alloy spring to pull the headband downwards, thus shortening its length. At this time, the control stop structure pops out and energizes the second memory alloy spring for heating, thereby pulling the headband downwards. The method for activating the heating of the second memory alloy spring is to use power management to control the circuit, including turning the power on and off. Furthermore, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit, thereby improving the heating speed.

[0171] Meanwhile, the distance sensor on the headband continuously monitors the distance between the user's head and the headband. When it detects that the distance value has decreased and is within a set range, it controls the second memory alloy spring to stop working, either by de-energizing the second memory alloy spring or reducing its current power; and it also controls the stop structure to drop, locking the current headband position.

[0172] If the distance sensor detects that the distance between the user's head and the headband is too small and exceeds a set range, the second return spring is controlled to push the headband upward. Specifically, the stop structure pops out, energizing and heating the second return spring to push the headband upward. The method for energizing and heating the second return spring is to use power management to control the circuit, including turning the power on and off; optionally, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit and improve the heating speed.

[0173] Meanwhile, the distance sensor on the headband continuously senses the distance between the user's head and the headband. When it detects that the distance value has decreased and is within the set range, it controls the second reset spring to stop working, that is, to cut off the power to the second reset spring or reduce the current power; and controls the stop structure to fall down and lock the current headband position.

[0174] Furthermore, when the user removes the headphones, the stop structure can be controlled to release its fixation, and the second return spring can be controlled to push the headband upwards. Once the second return spring has fully extended, the stop structure fixes the headband at its highest position.

[0175] Furthermore, wearable devices can include multiple first sensors, and these sensors can be of different types. For example, the headband can be equipped with a force sensor and a distance sensor, with the force sensor and distance sensor arranged alternately. This allows the headband length to be adjusted first based on the distance sensor, and then adjusted based on the force sensor. This improves the comfort of the user when wearing the wearable device.

[0176] Figure 21 This is a flowchart of the control method of the distance adjustment device in the embodiments of this application, with reference to... Figure 21The above method includes the following steps:

[0177] Step S201: Obtain the distance value between the wearable device and the user;

[0178] Step S202: Determine whether the distance value is within the first set range. If yes, proceed to step S203; otherwise, proceed to step S204.

[0179] Step S203: Control the shape memory alloy component to stop working;

[0180] Step S204: Control the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other;

[0181] Step S205: Obtain the pressure value between the wearable device and the user;

[0182] Step S206: Determine whether the pressure value is within the second set range. If yes, proceed to step S203; otherwise, proceed to step S204.

[0183] In a specific embodiment, the wearable device is a pair of headphones, the connecting component is the headband of the headphones, and the shape memory alloy component includes a second return spring and a stop structure. The shape memory alloy component is a second shape memory alloy spring, and the second return spring is a second return spring made of shape memory alloy material. The aforementioned shape memory alloy component is disposed on both sides of the headband, near the earcups. In addition, the headband of the headphones is equipped with a distance sensor to sense the distance between the user's position wearing the headphones and the headband of the headphones, thereby controlling the shape memory alloy component to automatically adjust the length of the connecting component; the headband of the headphones is also equipped with a force sensor to sense the pressure between the user's position wearing the headphones and the headband of the headphones. Specifically, the aforementioned pressure sensor and distance sensor can be arranged alternately. Furthermore, the headphones also include a second sensor for detecting whether the headphones are being worn. This second sensor can be a capacitive sensor. The state of whether the headphones are being worn can be determined by the change in the capacitance value of the capacitive sensor during the process of putting on and taking off the headphones. Optionally, other sensors, such as optical sensors, can also be used for headphone wearing detection.

[0184] When the headphones are in their initial state, the shape memory alloy components on both sides are not powered, and the stop structure fixes the second shape memory alloy spring at the top, thus placing the headband at its highest point. The second sensor detects when the user is wearing the headphones: the distance sensor senses the distance between the user's head and the headband, and the pressure sensor senses the pressure between the user's head and the headband.

[0185] If the distance value is not within the first preset range, the second memory alloy spring is activated. Specifically, during initial wear, because the headband is at its highest point, the distance sensor detects a relatively large distance, requiring the second memory alloy spring to pull the headband downwards, thus shortening its length. At this time, the control stop structure pops out and energizes the second memory alloy spring for heating, thereby pulling the headband downwards. The method for activating the heating of the second memory alloy spring is to use power management to control the circuit, including turning the power on and off. Furthermore, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit, thereby improving the heating speed.

[0186] Meanwhile, the distance sensor on the headband continuously senses the distance between the user's head and the headband, detecting when the distance decreases until it falls within a first set range.

[0187] If the distance sensor detects that the distance between the user's head and the headband is too small and exceeds a first preset range, the second return spring is controlled to push the headband upward. Specifically, the stop structure pops out, energizing and heating the second return spring to push the headband upward. The method for energizing and heating the second return spring is to use power management to control the circuit, including turning the power on and off; optionally, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit and improve the heating speed.

[0188] Meanwhile, the distance sensor on the headband continuously senses the distance between the user's head and the headband, detecting when the distance decreases until it falls within a first set range.

[0189] When the distance value is within the first range mentioned above, the pressure sensor on the headband continuously senses the pressure value between the user's head and the headband. If the pressure value is not within the second set range, the second shape memory alloy spring is activated. If the pressure sensor detects a low pressure value, the second shape memory alloy spring needs to pull the headband downwards, that is, shorten the length of the headband. At this time, the control stop structure pops out and energizes the second shape memory alloy spring to heat it, so as to pull the headband downwards. The method of energizing and heating the second shape memory alloy spring is to use power management to control the circuit, including turning the power on and off. In addition, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit and improve the heating speed.

[0190] Simultaneously, the pressure sensor on the headband continuously senses the pressure value between the user's head and the headband. When it detects an increase in pressure value that falls within a second preset range, it controls the second shape memory alloy spring to stop working, either by de-energizing the second shape memory alloy spring or reducing its current power; and it controls the stop structure to drop, locking the current headband position.

[0191] If the force sensor detects a large pressure value between the user's head and the headband, exceeding the second preset range, it controls the second return spring to push the headband upward. Specifically, the stop structure pops out, energizing and heating the second return spring to push the headband upward. The method for energizing and heating the second return spring involves using power management to control the circuit, including turning the power on and off; optionally, the control circuit can use a power amplifier circuit to increase the instantaneous output power of the circuit, thereby improving the heating speed.

[0192] Meanwhile, the force sensor on the headband continuously senses the pressure value between the user's head and the headband. When it detects that the pressure value has decreased and is within the second set range, it controls the second return spring to stop working, that is, to cut off the power to the second return spring or reduce the current power; and controls the stop structure to fall down and lock the current headband position.

[0193] Furthermore, when the user removes the headphones, the stop structure can be controlled to release its fixation, and the second return spring can be controlled to push the headband upwards. Once the second return spring has fully extended, the stop structure fixes the headband at its highest position.

[0194] In another embodiment, the above control method can also perform self-learning. During the user's wearing of the wearable device, user information can be acquired through self-learning. This self-learning process generates user information to understand the user's wearing habits. Based on this user information, the shape memory alloy component is then controlled to drive the first and second components to a set position. This solution allows for quick and precise adjustment of the length of the adjustable connection components of the wearable device.

[0195] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A distance adjustment device, characterized in that, It includes a first component and a second component, the first component is connected to the second component, and a shape memory alloy component is provided in the connection area between the first component and the second component. The shape memory alloy component is driven by current control to move the first component and the second component relative to each other and / or towards each other. The shape memory alloy component includes a first shape memory alloy component and a second shape memory alloy component, wherein: One end of the first shape memory alloy component is fixed to the first component, and the other end drives the second component to move in a first direction relative to the first component; when the temperature of the first shape memory alloy component is lower than a set threshold, the first shape memory alloy component is in a first state; when the temperature of the first shape memory alloy component is higher than the set threshold, the first shape memory alloy component is in a second state; the first shape memory alloy component is connected to two electrodes, and the first shape memory alloy component can be controlled by current to change between the first state and the second state, driving the second component to move in the first direction relative to the first component; One end of the second shape memory alloy component is fixed to the first component, and the other end drives the second component to move relative to the first component in a second direction, the first direction being opposite to the second direction; when the temperature of the second shape memory alloy component is lower than a set threshold, the second shape memory alloy component is in the second state; when the temperature of the second shape memory alloy component is higher than the set threshold, the second shape memory alloy component is in the first state; the second shape memory alloy component is connected to two electrodes, and the second shape memory alloy component can be controlled by current to change between the first state and the second state, driving the second component to move relative to the first component in the second direction; It also includes an auxiliary part disposed between the second component and the first component. When the auxiliary part is in a first state, either the first or second shape memory alloy component can contact the second component. When the auxiliary part is in a second state, there is a gap between the first or second shape memory alloy component and the second component. The first and second shape memory alloy components are bent in a second direction in a first form and bent in the first direction in a second form. When the auxiliary part is in the first state, the first shape memory alloy component changes from the first form to the second form, driving the second component to move in a first direction. When the auxiliary part is in the second state, the first shape memory alloy component changes from the second form to the first form. When the auxiliary part is in the first state, the second shape memory alloy component changes from the second form to the first form, driving the second component to move in a second direction. When the auxiliary part is in the second state, the second shape memory alloy component changes from the first form to the second form. Alternatively... The first and second shape memory alloy components are parallel to the first direction in the first form and bent away from the second component in the second form. The first shape memory alloy component includes a first end and a second end distributed along the second direction. The first end is fixed to the first component, and the second end is connected to a first linkage rod. The first linkage rod includes a third end and a fourth end distributed along the second direction. The second end is rotatably connected to the fourth end. A first baffle is fixed to the second end. When the first shape memory alloy component changes from the second form to the first form, the fourth end abuts against the first baffle, and the third end drives the second component to move in the first direction. The second shape memory alloy component includes a fifth end and a sixth end distributed along the second direction. The sixth end is fixed to the first component, and the fifth end is connected to a second linkage rod. The second linkage rod includes a seventh end and an eighth end distributed along the second direction. The fifth end is rotatably connected to the seventh end. A second baffle is fixed to the fifth end. When the second shape memory alloy component changes from the second form to the first form, the seventh end abuts against the second baffle, and the eighth end drives the second component to move in the second direction.

2. The distance adjustment device as described in claim 1, characterized in that, It also includes an elastic material layer that is stacked and fixed in a one-to-one correspondence with the first shape memory alloy component; and an elastic material layer that is stacked and fixed in a one-to-one correspondence with the second shape memory alloy component.

3. The distance adjustment device as described in claim 1, characterized in that, It includes multiple first shape memory alloy components and multiple second shape memory alloy components.

4. The distance adjustment device as described in claim 1, characterized in that, The second component is located between the first shape memory alloy component and the second shape memory alloy component.

5. The distance adjustment device as described in claim 1, characterized in that, One end of the auxiliary part is fixed to the first component, and the other end faces the second component. The first memory alloy component and the second memory alloy component are disposed between the first component and the second component. When the auxiliary part is in the second state, it drives the second component to move away from the surface of the first component. There is a gap between the first memory alloy component and the second memory alloy component and the second component.

6. The distance adjustment device according to any one of claims 1 to 5, characterized in that, The second component is located between the first shape memory alloy component and the second shape memory alloy component; One end of the auxiliary part is fixed to the first component, and the other end faces the second component; the auxiliary part includes a first auxiliary part and a second auxiliary part, the first auxiliary part and the first shape memory alloy component are located on the same side, and the second auxiliary part and the second shape memory alloy component are located on the same side; When the first auxiliary part is in the second state, it drives the second component to move away from the first shape memory alloy component, and there is a gap between the first shape memory alloy component and the second component; When the second auxiliary part is in the second state, it drives the second component to move away from the second shape memory alloy component, and there is a gap between the second shape memory alloy component and the second component.

7. The distance adjustment device according to any one of claims 1 to 5, characterized in that, The auxiliary part includes a first shape memory alloy spring, which is connected to two electrodes. When the temperature of the first shape memory alloy spring is lower than a set threshold, the first shape memory alloy spring is at a first length. When the temperature of the first shape memory alloy spring is higher than the set threshold, the first shape memory alloy spring extends toward the second component to a second length, which is greater than the first length, driving the second component to move away from the surface of the first component.

8. The distance adjustment device as described in claim 7, characterized in that, The auxiliary part further includes a first reset spring, which is arranged parallel to the first shape memory alloy spring. When the first shape memory alloy spring is of a first length, the first reset spring is in a state of energy release, and when the first shape memory alloy spring is of a second length, the first reset spring is in a state of energy storage.

9. The distance adjustment device according to any one of claims 1 to 5, characterized in that, The first shape memory alloy component has an elastic layer at the end facing the second component, and the second shape memory alloy component has an elastic layer at the end facing the second component.

10. The distance adjustment device according to any one of claims 1 to 4, characterized in that, The third end of the first linkage rod has an elastic layer, and the eighth end of the second linkage rod has an elastic layer.

11. The distance adjustment device according to any one of claims 1 to 5, characterized in that, It also includes a stop structure, which is disposed between the second component and the first component. When the stop structure is in a first state, the second component can move relative to the first component; when the stop structure is in a second state, the stop structure is fixedly connected to the second component and the first component.

12. The distance adjustment device as described in claim 11, characterized in that, The stop structure includes a rack, a gear, a locking element, an elastic element, and a shape memory alloy structure, wherein the gear is adapted to the rack; and the locking element can engage with the gear. The rack is fixedly disposed on the first component, and the shaft of the gear is fixedly disposed on the second component; the elastic element is disposed between the locking element and the second component, and the shape memory alloy structure is connected between the locking element and the second component; or, the rack is fixedly disposed on the second component, and the shaft of the gear is fixedly disposed on the first component; the elastic element is disposed between the locking element and the first component, and the shape memory alloy structure is connected between the locking element and the first component; When the temperature of the shape memory alloy structure is below a set threshold, the shape memory alloy structure is in a first state, and the elastic element drives the locking member to engage with the gear; when the temperature of the shape memory alloy structure is above the set threshold, the shape memory alloy structure is in a second state, driving the locking member to move away from the gear, the gear can mesh with the rack, and the elastic element is in an energy storage state.

13. The distance adjustment device according to any one of claims 1 to 5, characterized in that, The distance adjustment device includes a wearable device, which is equipped with a first sensor, a power supply module, and a controller. The first sensor is disposed on the wearable device and is used to detect the positional relationship between the wearable device and the user, generating a positional relationship signal. The power supply module is connected to the shape memory alloy component and is used to drive the shape memory alloy component to deform. The controller is signal-connected to the power supply module and the first sensor and is used to control the current input to the shape memory alloy component by the power supply module according to the positional relationship signal of the first sensor, thereby driving the first component and the second component to move relative to each other or towards each other.

14. The distance adjustment device as described in claim 13, characterized in that, The first sensor includes at least one type of force sensor, capacitive proximity sensor, ultrasonic distance sensor, laser rangefinder, infrared rangefinder, and light sensor.

15. The distance adjustment device as described in claim 13, characterized in that, It includes at least two of the first sensors.

16. The distance adjustment device as described in claim 15, characterized in that, The first sensor includes at least two types.

17. The distance adjustment device as described in claim 13, characterized in that, The wearable device is also equipped with a second sensor, which is connected to the controller. The second sensor is used to send a usage status signal to the controller when the wearable device is in use. After receiving the usage status signal, the controller is used to control the current input to the shape memory alloy component by the power supply module.

18. The distance adjustment device according to any one of claims 1 to 5, characterized in that, The distance adjustment device includes a wearable device, which is equipped with a power supply module and a voice controller. The power supply module is connected to the shape memory alloy component and is used to drive the shape memory alloy component to deform. The voice controller is connected to the power supply module and is used to receive the user's voice commands and control the current input to the shape memory alloy component by the power supply module according to the voice commands, so as to drive the first component and the second component to move relative to each other or move towards each other.

19. A control method for a distance adjustment device as described in any one of claims 1 to 18, characterized in that, include: Acquire the location relationship signal between the wearable device and the user; Determine whether the position relationship signal is within a set range. If yes, control the shape memory alloy component to stop working; if no, control the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other.

20. The control method as described in claim 19, characterized in that, The positional relationship signal includes pressure values ​​and / or distance values.

21. The control method as described in claim 19 or 20, characterized in that, include: Obtain the distance value between the wearable device and the user; Determine whether the distance value is within a first preset range; if not, control the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other. If so, control the shape memory alloy component to stop working; The control of the shape memory alloy component to stop working includes: Obtain the pressure value between the wearable device and the user; Determine whether the pressure value is within the second preset range. If yes, control the shape memory alloy component to stop working; if no, control the shape memory alloy component to drive the first component and the second component to move relative to each other or towards each other.

22. The control method as described in claim 19 or 20, characterized in that, Acquiring the location relationship signal between the wearable device and the user, prior to which includes: Obtain the usage status signal of the wearable device.

23. The control method as described in claim 19 or 20, characterized in that, This includes self-learning to generate user information, and controlling the shape memory alloy component to drive the first component and the second component to a set position based on the user information.

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