Brain-computer interface fixed interconnection device

Abstract

The invention relates to the field of brain-computer interfaces, in particular to a brain-computer interface fixing and interconnecting device which comprises a head band, an interaction hole is formed in the head band, a mounting frame is fixedly connected to the outer side of the head band, a first telescopic part and a plurality of second telescopic parts are arranged on the side, close to the interaction hole, of the mounting frame, and the output end of the first telescopic part is fixedly connected with an electrode mounting base. The electrode mounting base is used for mounting a non-invasive brain-computer interface electrode, and the output end of the second telescopic piece is fixedly connected with a pressure sensor; a controller and a power supply are fixedly connected to the head band, and the controller is used for acquiring pressure data detected by the pressure sensor, controlling stretching and retracting of the first telescopic part and the second telescopic part based on the pressure data, and adjusting pressure values of the non-invasive brain-computer interface electrode and the head of the user. According to the technical scheme, non-intrusive brain-computer interface electrodes of different manufacturers and models are paired through decoupling design, and therefore later equipment upgrading is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of brain-computer interface, and in particular to a brain-computer interface fixed interconnection device. Background Art

[0002] The research on brain-computer interface technology originated in the 1960s, when scientists tried to control robot limbs by monitoring brain waves. With the development of computer technology, brain-computer interface technology has been further developed. In the 21st century, with the cross-integration of multiple disciplines such as brain science, neuroscience, and information science, brain-computer interface technology has made significant progress. Today, brain-computer interface technology has become a hot research field, attracting the attention of many scientific research institutions and technology companies. The mechanism of action of brain-computer interface technology is to bypass peripheral nerves and muscles and directly establish a new communication and control channel between the brain and external devices. It achieves information transmission and control by capturing brain signals (such as brain waves) and converting them into electrical signals or other signals that can be recognized by external devices.

[0003] Brain-computer interface technology can be divided into many types. According to the different signal acquisition methods, it is mainly divided into invasive and non-invasive types. Invasive brain-computer interfaces require signal acquisition devices (such as electrodes) to be implanted directly into the cerebral cortex to obtain high-quality neural signals. Non-invasive brain-computer interfaces do not require implantation and directly collect signals from outside the brain. Commonly used methods include scalp electroencephalography (EEG), functional near-infrared spectroscopy (fNIRS), functional magnetic resonance imaging (fMRI), etc.

[0004] In the prior art, for example, patent publication number CN114447725B discloses a brain-computer interface fixed interconnection device, which improves the connection stability by rotating the connector, and CN109062406B discloses a brain-computer interface device, which reduces the slippage during movement by a clamping wheel. However, different users have different head shapes, and it is difficult to ensure sufficient fit when applied to users with different head shapes. In addition, the lack of standardized module design makes it impossible to interchange or be compatible between devices of different manufacturers and models. This limits the user's ability to choose different manufacturers or upgrade equipment. In addition, in terms of wearing comfort, a comprehensive consideration should be made in terms of comfort and stability. For example, after high-intensity brain use, the brain will heat up and be accompanied by a feeling of swelling. This swelling is a subjective feeling. At this time, the head may not actually swell, but it is also necessary to reduce the pressure on the user's head to enhance the user's experience. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a brain-computer interface fixed interconnection device, which can pair non-invasive brain-computer interface electrodes of different manufacturers and models through a decoupled design, thereby facilitating the subsequent upgrading of the equipment.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a brain-computer interface fixed interconnection device, comprising a headband, an interactive hole is opened on the headband, a mounting frame is fixedly connected to the outside of the headband, a first telescopic member and a plurality of second telescopic members are provided on the side of the mounting frame close to the interactive hole, an output end of the first telescopic member is fixedly connected to an electrode mounting base, the electrode mounting base is used to install a non-invasive brain-computer interface electrode, an output end of the second telescopic member is fixedly connected to a pressure sensor, the second telescopic member is used to adjust the pressure sensor to align with the contact surface of the non-invasive brain-computer interface electrode, and the first telescopic member and the plurality of second telescopic members are respectively used to drive the non-invasive brain-computer interface electrode and the pressure sensor to probe into the interactive hole; A controller and a power supply are fixedly connected to the headband. The controller is used to obtain pressure data detected by the pressure sensor, control the extension and retraction of the first retractable part and the second retractable part based on the pressure data, and adjust the pressure value of the non-invasive brain-computer interface electrode and the user's head.

[0007] The above scheme has the following beneficial effects: 1. In this solution, the user completes the contact between the brain-computer interface and the head by wearing a headband, and the electrode mounting base is used to install the non-invasive brain-computer interface electrode, so as to detect the brain signal through the non-invasive brain-computer interface electrode. The pressure sensor can detect the contact pressure between the non-invasive brain-computer interface electrode and the user, thereby controlling the first telescopic member and the plurality of second telescopic members, so that the non-invasive brain-computer interface electrode always maintains a certain contact pressure.

[0008] 2. In this solution, as technology advances or product diversity increases, the core component non-invasive brain-computer interface electrodes may be replaced during iterations, and the replaced non-invasive brain-computer interface electrodes may have new shapes and thicknesses. After replacing the non-invasive brain-computer interface electrodes, since the non-invasive brain-computer interface electrodes extend from the outside into the inside of the headband, the replacement will not reduce the contact diameter of the inner circle of the headband. The pressure sensor is paired with the second telescopic part so that the pressure sensor can be aligned with the contact surface of the replaced non-invasive brain-computer interface electrode, and the contact pressure of the non-invasive brain-computer interface electrode is controlled by the first telescopic part and several second telescopic parts, so as to adapt to different non-invasive brain-computer interface electrode models and have the ability to upgrade later.

[0009] Furthermore, the non-invasive brain-computer interface electrodes are made of flexible conductive materials, and the pressure sensor is a flexible thin film sensor.

[0010] Beneficial effects: Both the flexible conductive material and the flexible film sensor can better fit the user's head, thereby achieving a more suitable detection effect.

[0011] Furthermore, it also includes a plurality of accessory mounting plates, one side of the accessory mounting plate is provided with an accessory mounting base, the other side of the accessory mounting plate is provided with a plurality of protrusions, and the headband is provided with a plurality of engaging grooves that cooperate with the protrusions.

[0012] Beneficial effects: In addition to the core component non-invasive brain-computer interface electrode, accessories such as signal amplifiers and external EEG analysis equipment may also be involved. Therefore, the installation and upgrade of various accessories are adapted through the accessory mounting base, and a detachable connection is provided through the bumps and snap-in grooves.

[0013] Furthermore, the protrusion and the engaging groove are both T-shaped.

[0014] Beneficial effect: The T-shaped protrusion and the engaging groove have a better restraining effect, so as to reduce the possibility of unstable installation or shaking of the accessory.

[0015] Furthermore, a tension adjuster is provided on the headband, and the tension adjuster is used to change the diameter of the headband.

[0016] Beneficial effect: Different users have different head circumferences, and the elastic adjuster can adjust the diameter of the headband to adapt to users with different head circumferences.

[0017] Further, the first telescopic member is used to adjust the alignment of the contact surface of the electrode of the non-invasive brain-computer interface with the inner side surface of the headband; When the headband is worn, the controller adjusts the diameter of the headband and the tightness of the headband according to the pressure data detected by the pressure sensor.

[0018] Beneficial effect: During the headband wearing stage, the contact surface of the non-invasive brain-computer interface electrode can be adjusted to align with the inner side of the headband, thereby detecting the tightness of the headband. In the subsequent use stage, the headband is light in weight and has little influence of inertia and small displacement, so it is sufficient to ensure that the contact pressure of the non-invasive brain-computer interface electrode is appropriate.

[0019] Furthermore, the output shaft of the second telescopic member is also fixedly connected with a temperature sensor.

[0020] Beneficial effect: Since the second telescopic member is adjusted following the first telescopic member, the temperature sensor can always monitor the temperature of the contact part of the non-invasive brain-computer interface electrode.

[0021] Furthermore, the controller uses the head temperature detected by the temperature sensor as an evaluation value for brain fatigue, anxiety and tension, brain swelling and pathological effects. When the head temperature exceeds a preset value, the controller controls the tension adjuster to increase the diameter of the headband, and controls the first telescopic part and several second telescopic parts to increase the pressure value between the non-invasive brain-computer interface electrodes and the flexible film sensor and the user's head.

[0022] Beneficial effects: Head fever can cause the temperature sensor reading to increase. Head fever may be caused by excessive stress, emotional excitement, excessive fatigue, colds, and heat stroke. Therefore, head fever can be used to feedback the user's brain condition. In the case of head fever, most of the conditions are negative, which will affect the propagation of brain signals. At the same time, head fever may be accompanied by a feeling of brain swelling. Therefore, the diameter of the headband is loosened to relieve the feeling of brain swelling, and the contact pressure of the non-invasive brain-computer interface electrode is increased to maintain the fixation effect and improve the brain signal collection effect of the non-invasive brain-computer interface electrode.

[0023] Furthermore, an inertial sensor is detachably connected to the mounting frame, and the controller is used to obtain the acceleration monitored by the inertial sensor. When the acceleration exceeds a preset value, the tension adjuster is controlled to reduce the diameter of the headband, and the first telescopic member and several second telescopic members are controlled to increase the pressure value between the non-invasive brain-computer interface electrodes and the flexible film sensor and the user's head.

[0024] Beneficial effects: Users may exercise during the process of brain signal collection. The inertial sensor can collect acceleration data during exercise. The controller will reduce the diameter of the headband according to the acceleration to improve the fixation effect, thereby preventing loosening during exercise.

[0025] Furthermore, the headband includes a band body, the tension adjuster includes a box body, one end of the band body is fixedly connected to the box body, the other end of the band body extends into the box body, a motor is fixedly connected to the box body, and one end of the band body extending into the box body is fixedly connected to the output shaft of the motor.

[0026] Beneficial effect: The output shaft of the motor can be rotated to wind the belt body onto the output shaft of the motor, thereby controlling the length of the loop formed by the belt body and adjusting the tightness of the headband.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an axonometric diagram of an embodiment of a brain-computer interface fixed interconnection device of the present invention; Figure 2 A schematic diagram of a tension adjuster of an embodiment of a brain-computer interface fixed interconnection device of the present invention; Figure 3 A side view schematic diagram of an embodiment of a brain-computer interface fixed interconnection device of the present invention; Figure 4 The brain-computer interface of the present invention is fixed with an interconnection device Figure 2 An enlarged schematic diagram of part A.

[0029] The figure marks in the drawings of the specification include: 1. headband; 2. interaction hole; 3. mounting frame; 4. first telescopic member; 5. second telescopic member; 6. electrode mounting base; 7. non-invasive brain-computer interface electrode; 8. pressure sensor; 9. accessory mounting plate; 10. accessory mounting base; 11. bump; 12. snap-fit ​​groove; 13. tension adjuster; 14. temperature sensor; 15. motor; 16. inertial sensor. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The following is further described in detail through specific implementation methods: Embodiment 1: As attached Figure 1-Figure 4 As shown: A brain-computer interface fixed interconnection device includes a headband 1, an interaction hole 2 is opened on the headband 1, a mounting frame 3 is bonded and fixed to the outer side of the headband 1, a first telescopic member 4 and a plurality of second telescopic members 5 are bolted to the side of the mounting frame 3 close to the interaction hole 2, the first telescopic member 4 and the second telescopic member 5 are both miniature electric push rods, an electrode mounting base 6 is bolted to the output end of the first telescopic member 4, and the electrode mounting base 6 is used to install a non-invasive brain-computer interface electrode 7.

[0034] A pressure sensor 8 is bonded and fixed to the output end of the second telescopic member 5, and the second telescopic member 5 is used to adjust the pressure sensor 8 to be aligned with the contact surface of the non-invasive brain-computer interface electrode 7. The first telescopic member 4 and several second telescopic members 5 are respectively used to drive the non-invasive brain-computer interface electrode 7 and the pressure sensor 8 to probe into the interaction hole 2.

[0035] A controller and a power supply are bonded and fixed to the headband 1. The controller is used to obtain pressure data detected by the pressure sensor 8, control the extension and retraction of the first retractable member 4 and the second retractable member 5 based on the pressure data, and adjust the pressure value of the non-invasive brain-computer interface electrode 7 and the user's head.

[0036] It also includes a plurality of accessory mounting plates 9, one side of the accessory mounting plate 9 is provided with an accessory mounting base 10, the other side of the accessory mounting plate 9 is provided with a plurality of protrusions 11, and the headband 1 is provided with a plurality of snap-fitting grooves 12 that cooperate with the protrusions 11, and both the snap-fitting grooves 12 and the protrusions 11 are T-shaped.

[0037] The headband 1 is provided with a tension adjuster 13, which is used to change the diameter of the headband 1. The headband 1 includes a band body, and the tension adjuster 13 includes a box body, one end of the band body is fixedly connected to the box body, and the other end of the band body extends into the box body, a motor 15 is bolted in the box body, and one end of the band body extending into the box body is fixedly connected to the output shaft of the motor 15.

[0038] The first telescopic member 4 is used to adjust the contact surface of the non-invasive brain-computer interface electrode 7 to be aligned with the inner side of the headband 1. When the headband 1 is worn, the controller relaxes the headband 1 according to the pressure data detected by the pressure sensor 8, thereby adjusting and changing the diameter of the headband 1 and controlling the tightness of the headband 1.

[0039] The user can wear the headband 1 and use the non-invasive brain-computer interface electrode 7 on the electrode mounting base 6 to collect brain signals. The non-invasive brain-computer interface electrode 7 communicates with the brain by recording the discharge of the cerebral cortex. The cerebral cortex is the outermost layer of neurons on the surface of the brain, which is responsible for the brain's perception, movement, thinking and other activities. When the neurons in the cerebral cortex are active, weak electrical signals are generated. These signals can be collected by the non-invasive brain-computer interface electrode 7 and converted into control signals through signal processing technology.

[0040] Before using, the user needs to install the non-invasive brain-computer interface electrode 7 on the electrode mounting base 6, and adjust the position of the non-invasive brain-computer interface electrode 7 through the first telescopic member 4 and the second telescopic members 5, so that the position of the non-invasive brain-computer interface electrode 7 is aligned with the inner side of the headband 1, and the pressure sensor 8 is aligned with the contact surface of the non-invasive brain-computer interface electrode 7. After the alignment is completed, the headband 1 is worn on the head. The controller automatically changes the diameter of the headband 1 according to the detection data of the pressure sensor 8, so that the headband 1 is firmly on the user's head.

[0041] During use, since the contact of the non-invasive brain-computer interface electrode 7 will affect the use effect, it is necessary to always keep the non-invasive brain-computer interface electrode 7 in contact with the user's head. Therefore, during use, the pressure sensor 8 will continuously monitor the fitting pressure with the user's head and always keep it aligned with the contact surface of the brain-computer interface electrode to ensure the contact effect.

[0042] With the advancement of technology or the improvement of product diversity, the core component non-invasive brain-computer interface electrode 7 may be replaced during iteration, and the replaced non-invasive brain-computer interface electrode 7 may have a new shape and thickness. After replacing the non-invasive brain-computer interface electrode 7, since the non-invasive brain-computer interface electrode 7 is inserted into the inside of the headband 1 from the outside, the replacement will not reduce the contact diameter of the inner circle of the headband 1. The pressure sensor 8 is paired with the second telescopic part 5 so that the pressure sensor 8 can be aligned with the contact surface of the replaced non-invasive brain-computer interface electrode 7, and the contact pressure of the non-invasive brain-computer interface electrode 7 is controlled by the first telescopic part 4 and several second telescopic parts 5, so as to adapt to different non-invasive brain-computer interface electrode 7 models and have the ability to upgrade later.

[0043] In addition to the core component, the non-invasive brain-computer interface electrode 7, there may also be accessories such as signal amplifiers and external EEG analysis equipment. Therefore, the accessory mounting base 10 is adapted to the installation and upgrading of various accessories, and a detachable connection is provided through the protrusion 11 and the snap-fit ​​groove 12. The protrusion 11 and the snap-fit ​​groove 12 are both T-shaped, which has a better restraining effect to reduce the possibility of unstable or shaking installation of accessories.

[0044] The output shaft of the second telescopic member 5 is also bonded and fixed with a temperature sensor 14. Based on the head temperature detected by the temperature sensor 14, the controller uses the head temperature value as an evaluation value for brain fatigue, anxiety and tension, brain swelling and pathological effects. When the head temperature exceeds a preset value, the controller controls the tension adjuster 13 to increase the diameter of the headband 1, and controls the first telescopic member 4 and several second telescopic members 5 to increase the pressure value between the non-invasive brain-computer interface electrode 7 and the flexible film sensor and the user's head.

[0045] A hot head will cause the reading of the temperature sensor 14 to increase. The reasons for a hot head may be excessive stress, emotional excitement, excessive fatigue, cold and heat stroke, etc. Therefore, a hot head can be used to feedback the user's brain condition. In the case of a hot head, most of the conditions are negative, which will affect the propagation of brain signals. For example, the amplitude of neural signals decreases after brain fatigue, and emotional excitement increases the amount of clutter detected.

[0046] At the same time, a hot head may be accompanied by a feeling of brain swelling. The main causes of this feeling of brain swelling are excessive mental activity, high mental stress, insufficient brain rest, pathological factors, etc. These are highly similar to the causes of a hot head and often occur together.

[0047] The feeling of brain swelling is a subjective feeling. According to research, when the feeling of brain swelling occurs, the head circumference may not change. However, by loosening the diameter of the headband 1, the effect of the headband 1 on the feeling of brain swelling can be reduced, thereby alleviating the feeling of brain swelling and improving the user's comfort.

[0048] In addition, due to reasons such as the decrease in the amplitude of the neural signal, the contact pressure of the non-invasive brain-computer interface electrode 7 is increased to maintain the fixation effect and improve the brain signal collection effect of the non-invasive brain-computer interface electrode 7.

[0049] An inertial sensor 16 is detachably connected to the mounting frame 3, and the controller is used to obtain the acceleration monitored by the inertial sensor 16. When the acceleration exceeds a preset value, the tension adjuster 13 is controlled to reduce the diameter of the headband 1, and the first telescopic member 4 and several second telescopic members 5 are controlled to increase the pressure value between the non-invasive brain-computer interface electrode 7 and the flexible film sensor and the user's head.

[0050] One of the uses of brain-computer interface is to control mechanical limbs to replace the user to complete or cooperate with certain movements. However, during the movement, due to inertia, there will be a certain drift in the contact between the non-invasive brain-computer interface electrode 7 and the user's head. Therefore, the inertial sensor 16 is used to monitor whether the user is exercising, and the diameter of the headband 1 is tightened to provide a better contact effect of the non-invasive brain-computer interface electrode 7.

[0051] Embodiment 2: The difference from the above embodiments is that the non-invasive brain-computer interface electrode 7 is made of flexible conductive material, and the pressure sensor 8 is a flexible thin film sensor.

[0052] Both flexible conductive materials and flexible film sensors can better fit the user's head, thereby achieving a more suitable detection effect.

[0053] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A brain-computer interface fixed interconnection device, characterized in that: The headband (1) comprises a headband (1), wherein an interaction hole (2) is formed on the headband (1), a mounting frame (3) is fixedly connected to the outside of the headband (1), a first telescopic member (4) and a plurality of second telescopic members (5) are provided on a side of the mounting frame (3) close to the interaction hole (2), an output end of the first telescopic member (4) is fixedly connected to an electrode mounting base (6), the electrode mounting base (6) is used to mount a non-invasive brain-computer interface electrode (7), an output end of the second telescopic member (5) is fixedly connected to a pressure sensor (8), the second telescopic member (5) is used to adjust the contact surface of the pressure sensor (8) and the non-invasive brain-computer interface electrode (7) to be aligned, and the first telescopic member (4) and the plurality of second telescopic members (5) are respectively used to drive the non-invasive brain-computer interface electrode (7) and the pressure sensor (8) to penetrate into the interaction hole (2); A controller and a power supply are fixedly connected to the headband (1); the controller is used to obtain pressure data detected by the pressure sensor (8), control the extension and retraction of the first retractable member (4) and the second retractable member (5) based on the pressure data, and adjust the pressure value between the non-invasive brain-computer interface electrode (7) and the user's head.

2. The brain-computer interface fixed interconnection device according to claim 1, characterized in that: The non-invasive brain-computer interface electrode (7) is made of a flexible conductive material, and the pressure sensor (8) is a flexible thin film sensor.

3. The brain-computer interface fixed interconnection device according to claim 1, characterized in that: It also comprises a plurality of accessory mounting plates (9), one side of the accessory mounting plates (9) is provided with an accessory mounting base (10), the other side of the accessory mounting plates (9) is provided with a plurality of protrusions (11), and the headband (1) is provided with a plurality of engaging grooves (12) that cooperate with the protrusions (11).

4. The brain-computer interface fixed interconnection device according to claim 3, characterized in that: The protrusion (11) and the engaging groove (12) are both T-shaped.

5. The brain-computer interface fixed interconnection device according to claim 4, characterized in that: The headband (1) is provided with a tension adjuster (13), and the tension adjuster (13) is used to change the diameter of the headband (1).

6. The brain-computer interface fixed interconnection device according to claim 5, characterized in that: The first telescopic member (4) is used to adjust the contact surface of the non-invasive brain-computer interface electrode (7) to be aligned with the inner side surface of the headband (1); When the headband (1) is worn, the controller adjusts the diameter of the headband (1) and the tightness of the headband (1) according to pressure data detected by the pressure sensor (8).

7. The brain-computer interface fixed interconnection device according to claim 6, characterized in that: The output shaft of the second telescopic member (5) is also fixedly connected to a temperature sensor (14).

8. The brain-computer interface fixed interconnection device according to claim 7, characterized in that: The controller uses the head temperature value as an evaluation value for expressing brain fatigue, anxiety and tension, brain swelling and pathological effects based on the head temperature detected by the temperature sensor (14). When the head temperature exceeds a preset value, the controller controls the tension adjuster (13) to increase the diameter of the headband (1), and controls the first telescopic member (4) and a plurality of second telescopic members (5) to increase the pressure value between the non-invasive brain-computer interface electrode (7) and the flexible film sensor and the user's head.

9. The brain-computer interface fixed interconnection device according to claim 8, characterized in that: An inertial sensor (16) is detachably connected to the mounting frame (3), and the controller is used to obtain the acceleration monitored by the inertial sensor (16). When the acceleration exceeds a preset value, the tension adjuster (13) is controlled to reduce the diameter of the headband (1), and the first telescopic member (4) and a plurality of second telescopic members (5) are controlled to increase the pressure value between the non-invasive brain-computer interface electrode (7) and the flexible film sensor and the user's head.

10. The brain-computer interface fixed interconnection device according to claim 9, characterized in that: The headband (1) comprises a band body, and the tension adjuster (13) comprises a box body, one end of the band body is fixedly connected to the box body, the other end of the band body extends into the box body, a motor (15) is fixedly connected inside the box body, and one end of the band body extending into the box body is fixedly connected to an output shaft of the motor (15).

Images