A dynamic headgear adjustment structure for a non-invasive brain-computer interface device

Abstract

The utility model provides a kind of for non-invasive brain-computer interface equipment's dynamic binding band adjusting structure, it is related to non-invasive brain-computer interface technical field, including signal acquisition cap body and non-invasive electrode, signal acquisition cap body is semicircular flexible base structure, signal acquisition cap body surface is based on signal acquisition acupoint and is equipped with multiple signal transmission through-hole, each signal transmission through-hole inside is equipped with non-invasive electrode, the both sides of signal acquisition cap body are equipped with skull positioning member, and skull perimeter restraint band is equipped at the end of skull positioning member, it is characterized in that, skull perimeter restraint band is connected with anti-reverse locking device away from the end of skull positioning member. By the cooperation between above-mentioned structure, it can have following beneficial effects: first, can according to user individual head circumference, head shape contour and ear position dynamic adjustment binding band tightness;Second, by modular design and one-way locking function, user can quickly complete personalized adjustment, operation convenience and compatibility are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of non-invasive brain-computer interface technology, and in particular to a dynamic strap adjustment structure for non-invasive brain-computer interface devices. Background Technology

[0002] As a comprehensive representation of ion exchange and metabolic activities in brain nerve cells, electroencephalogram (EEG) signals carry a large amount of physiological and cognitive information. They have important application value in clinical disease diagnosis and treatment, neurofeedback training, and augmented reality mind control. Monitoring and analyzing EEG signals can not only provide effective treatment methods for the medical field, but also be used in mind control fields such as AR.

[0003] There are two methods for acquiring electroencephalogram (EEG) signals: invasive and non-invasive. Invasive acquisition involves opening the skull and implanting sensors, which is not suitable for everyday use. Non-invasive EEG acquisition involves placing electrode sensors outside the cerebral cortex to collect EEG signals. This method is more commonly used in brain-computer interface products and is also frequently seen in daily life.

[0004] Non-invasive brain-computer interface devices collect brain signals by placing electrode sensors (such as wet or dry electrodes) on the scalp surface. Due to their non-invasive operation, high safety, and wide range of applications, they have become the main direction of current research and commercialization.

[0005] However, existing fixed-wear structures for non-invasive devices generally suffer from poor adaptability: traditional headbands or caps use rigid frames or a single size design, making it impossible to flexibly adjust to individual differences in head circumference, head shape, and ear position. This results in the fixed structure causing local pressure marks and restricted blood circulation when worn too tightly during prolonged use, while being too loose makes it difficult to maintain a stable fit between the electrodes and the scalp. Unstable contact between the electrodes and the scalp may reduce signal acquisition accuracy, further affecting the continuity and reliability of EEG signals. To address these issues, there is an urgent need for a structural design that can dynamically adjust the tightness of the straps, is compatible with different head shapes, and ensures wearing comfort, thus achieving personalized adaptation of brain-computer interface devices. Utility Model Content

[0006] To address the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a dynamic strap adjustment structure for non-invasive brain-computer interface devices, which can dynamically adjust the tightness of the strap, be compatible with different head shapes and take into account wearing comfort, so as to achieve personalized adaptation of brain-computer interface devices.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a dynamic strap adjustment structure for a non-invasive brain-computer interface device, including a signal acquisition cap and non-invasive electrodes. The signal acquisition cap has a semi-circular flexible base structure. The surface of the signal acquisition cap is provided with multiple signal conduction holes corresponding to signal acquisition acupoints. Each signal conduction hole is provided with a non-invasive electrode. Both sides of the signal acquisition cap are provided with skull positioning components. A cranial restraint band is provided at the end of the skull positioning component. The characteristic feature is that the end of the cranial restraint band away from the skull positioning component is connected to an anti-reverse locking device, and an elastic adjustment strap is adjustable between the two anti-reverse locking devices.

[0008] In the preferred embodiment, the two skull positioning components are arranged in a mirror image facing each other; A detachable chin soothing pad is attached to the middle of the elastic adjustment band, and the chin soothing pad extends along the axial direction of the elastic adjustment band.

[0009] In a preferred embodiment, the anti-reverse locking device includes a ratchet guide rail located on one side of the elastic adjustment belt, and a locking housing located between the ratchet guide rail and the outer side of the elastic adjustment belt. The locking housing has a rectangular through structure, and two drive cavities are symmetrically arranged inside the locking housing along the width direction. The axis of the drive cavities is perpendicular to the extension direction of the ratchet guide rail.

[0010] In the preferred embodiment, the outer wall of the ratchet guide rail is provided with isosceles trapezoidal ratchet teeth that are evenly distributed along the length direction. The inclination angle of the isosceles trapezoidal ratchet teeth is 60° to form a one-way locking guide structure.

[0011] In the preferred embodiment, each drive cavity is rotatably connected to a rotating pivot via a bearing. An adjustment hole is provided on each of the two drive cavities on opposite sides. The outer wall of the rotating pivot is rotatably connected to a pawl that engages with an isosceles trapezoidal ratchet via a bearing. The pawl has an L-shaped plate structure. The outer wall of the rotating pivot is located in the middle of the pawl. The pawl passes through the adjustment hole and abuts against the isosceles trapezoidal ratchet on the ratchet guide rail. The short arm end of the pawl is provided with a V-shaped meshing part that matches the isosceles trapezoidal ratchet, and the long arm end is connected to the inner wall of the drive cavity via a tension spring.

[0012] In the preferred embodiment, a limiting rod is provided on the inner wall of the drive cavity and on the long arm end of the pawl, and a tension spring is provided between the outer walls of the two limiting rods, forming a dynamic constraint with the tension spring.

[0013] In a preferred embodiment, a multi-segment adjustment component with a Z-shaped bend is provided on the side of the long arm end of the pawl away from the limiting rod. The vertical segment of the multi-segment adjustment component has a trapezoidal hole with a wider inner diameter and a narrower outer diameter. The trapezoidal hole is hinged to a reset drive assembly, and the multi-segment adjustment component and the reset drive assembly form an unlocking transmission chain.

[0014] In a preferred embodiment, the reset drive assembly includes a ball joint, a linkage push rod, a limit stop, and an adjustment button. One end of the linkage push rod is fixed to the ball joint, and the other end is mechanically coupled to the adjustment button through the limit block. The limit block is located in the drive cavity. One end of the adjustment button passes through the side wall of the locking housing and extends to the outside, while the other end is fixed to one side of the limit block.

[0015] This invention provides a dynamic strap adjustment structure for a non-invasive brain-computer interface device. Through the cooperation of the above structures, the following beneficial effects can be achieved: First, the tightness of the straps can be dynamically adjusted according to the user's individual head circumference, head shape and ear position, avoiding local pressure or loosening caused by fixed size design, and significantly reducing health risks such as local pressure marks and restricted blood circulation when worn for a long time; Secondly, through modular design and one-way locking function, users can quickly complete personalized adjustments, greatly improving ease of operation and compatibility. It can compensate for tension fluctuations caused by head movement in real time during wear, maintain the pressure balance of the electrode-scalp contact interface, and keep the surface contact bioelectric sensor array in the best signal pickup state at all times. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is the main view structural diagram of this utility model; Figure 2 This is a diagram illustrating the wearing and use of this utility model; Figure 3 This is a three-dimensional cross-sectional view of the anti-reverse locking device of this utility model; Figure 4 This utility model Figure 3 Enlarged view of part A; Figure 5 This is an exploded view of the structure of the reset drive component of this utility model.

[0017] In the diagram: 1. Signal acquisition cap; 2. Non-invasive electrode; 3. Skull positioning device; 4. Skull girth restraint band; 5. Elastic adjustment strap; 6. Anti-reverse locking device; 6. Ratchet guide rail; 61. Locking housing; 62. Rotating pivot; 63. Pawl; 64. Limiting rod; 65. Tension spring; 66. Multi-segment adjustment device; 67. Reset drive device; 68. Spherical adjustment joint; 681. Linkage rod; 682. Limiting block; 683. Adjustment button; 684. Jaw relaxation pad. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this utility model, the embodiments and features described herein can be combined with each other without conflict. The utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1 like Figures 1-5 As shown in the figure, this embodiment illustrates a dynamic strap adjustment structure for a non-invasive brain-computer interface device, including a signal acquisition cap 1 and a non-invasive electrode 2. The signal acquisition cap 1 has a semi-circular flexible base structure, and its outer surface is provided with multiple signal conduction holes in accordance with the international 10-20 electrode positioning system (key acupoints such as Fz, Cz, Pz) or the distribution law of bioelectric signal acquisition acupoints on the human head. Furthermore, each signal conduction via is provided with a stepped cavity structure, including a first-stage cavity and a second-stage cavity; The diameter of the first-stage cavity is larger than that of the electrode body, and it is used to accommodate the conductive contacts of the non-invasive electrode 2. The diameter of the second-stage cavity is slightly smaller than that of the electrode body. The non-invasive electrode 2 is axially positioned and radially elastically contacted through an elastic support structure or threads.

[0020] Specifically, a conductive silver paste layer with a thickness of 5-10 μm is coated on the inner wall surface of the signal conduction via to enhance the signal conduction efficiency between the non-invasive electrode 2 and the scalp.

[0021] The conductive silver paste layer can be replaced with a nano-silver wire coating or a conductive zinc oxide film, with equivalent functionality. Furthermore, the inner wall of each signal conduction through hole is detachably connected to the non-invasive electrode 2 through an elastic support structure. The elastic support structure includes circumferentially evenly distributed flexible spring sheets, one end of which is fixedly connected to the inner wall of the signal conduction through hole, and the other end extends towards the central axis of the signal conduction through hole to form an electrical limit positioning groove. The outer peripheral wall of the non-invasive electrode 2 is provided with an annular boss that cooperates with the limit positioning groove to achieve axial positioning and radial elastic contact of the non-invasive electrode 2.

[0022] It should be noted that the outer surface of the signal acquisition cap 1 is designed with a biomimetic human skull contour. The radius of curvature is optimized through finite element analysis to ensure a fit of ≥85% to the scalp of users with different head shapes. The cap 1 is made of lightweight polymer composite material, which can be a polyurethane resin matrix with embedded carbon fiber reinforcement layers, combining flexibility and deformation resistance. The thickness ranges from 2-5mm to balance signal shielding performance and wearing comfort.

[0023] The non-invasive electrode 2 includes a flexible insulating substrate and a conductive contact portion disposed on its inner side. The conductive contact portion adopts a micro-convex array structure or conductive rubber material, and its outer end face is configured as an arc shape that adaptively conforms to the surface of the human scalp. When the signal acquisition cap 1 is worn on the head, the conductive contact portion maintains a constant contact pressure with the scalp surface of the corresponding acupoint area through the pre-tightening force of the elastic support structure, so as to achieve efficient acquisition of EEG signals. The aperture size and distribution density of the signal conduction via are optimized according to the spatial resolution requirements of the target acquisition frequency band (δ / θ / α / β waves), and a conductive shielding layer is provided on the inner wall to reduce external electromagnetic interference.

[0024] Among them, the non-invasive electrode 2 is made of a flexible conductive material, which is either a graphene composite conductive fabric or a liquid metal alloy. Furthermore, such as Figure 1 , 2 As shown, the signal acquisition cap 1 has three-point skull positioning components 3 symmetrically fixedly connected on both sides. The skull positioning components 3 adopt an arc-shaped support structure that conforms to the anatomical characteristics of the human skull. The inner wall of the component is equipped with a pressure sensor array (not shown in the prior art) to achieve adaptive positioning of the skull landmarks. The two skull positioning components 3 are distributed in a mirror symmetrical manner. Their ends are movably connected to one end of the cranial restraint band 4 through a rotating rod. The cranial restraint band 4 adopts a flexible fabric base and has an internal conductive fiber layer to achieve signal transmission.

[0025] The skull positioning component 3 is made of the same material as the signal acquisition cap 1.

[0026] Further as Figures 3 to 5 As shown, the end of the cranial restraint band 4 away from the rotating rod is fixedly connected to one end of the anti-reverse locking device 6, which includes: A ratchet guide rail 61 is fixed to one side edge of the elastic adjustment belt 5. The ratchet guide rail 61 is made of rigid polymer material integrally formed with the belt body. Its outer side wall is provided with an isosceles trapezoidal ratchet row with a tooth pitch of 1.5 mm and a tooth height of 0.8 mm along the length direction. The tooth surface is inclined at an angle of 60° to form a one-way locking guide structure. like Figure 3 As shown, the locking housing 62 has a rectangular hollow structure, and its interior is divided along the width direction to form two symmetrically arranged drive cavities. The axis of the drive cavity is perpendicular to the extension direction of the ratchet guide rail 61.

[0027] Specifically, the locking housing 62 is made of ABS engineering plastic with a wall thickness of 2mm. The internal drive cavity has dimensions of 15mm×10mm×8mm, which meets the structural design requirements of miniaturized wearable devices. The interface between the ratchet guide rail 61 and the elastic adjustment strap 5 is provided with a conductive shielding layer (not shown) to prevent the frictional static electricity generated during mechanical adjustment from interfering with the acquisition of EEG signals.

[0028] Each drive chamber is rotatably connected to a rotating pivot 63 via a bearing. An adjustment hole is provided on one side of each of the two drive chambers. The outer wall of the rotating pivot 63 is rotatably connected to a pawl 64 that engages with an isosceles trapezoidal ratchet via a bearing. The pawl 64 has an L-shaped plate structure. The outer wall of the rotating pivot 63 is located in the middle of the pawl 64. The pawl 64 passes through the adjustment hole and abuts against the isosceles trapezoidal ratchet on the ratchet guide rail 61. The short arm end of the pawl 64 is provided with a V-shaped meshing part that matches the isosceles trapezoidal ratchet. The long arm end is connected to the inner wall of the drive chamber via a tension spring 66 to form the ratchet meshing pressure in the initial preload state. The included angle of the V-shaped meshing part is 60°, which is consistent with the inclination angle of the isosceles trapezoidal ratchet on the ratchet guide rail 61. Furthermore, limiting rods 65 are respectively provided on the inner wall of the drive cavity and the long arm end of the pawl 64. A tension spring 66 is provided between the outer walls of the two limiting rods 65, and forms a dynamic constraint with the tension spring 66. The initial torque of the tension spring 66 is 0.2-0.3 N·m, so that the V-shaped meshing part maintains a rigid contact with the vertical surface of the top of the isosceles trapezoidal ratchet with a pressure of 0.4-0.6 N / mm.

[0029] During implementation, when force is applied along the stretching direction of the elastic adjustment strap 5, the V-shaped engagement part of the pawl 64 slides along the inclined surface of the isosceles trapezoidal ratchet, causing the rotating pivot 63 to rotate clockwise. At this time, the tension spring 66 stores force, and the short arm end of the pawl 64 moves synchronously upward in the adjustment hole, realizing unobstructed strap length adjustment. When the external force is removed or reversed, the restoring torque of the tension spring 66 drives the pawl 64 to rotate counterclockwise, so that the V-shaped meshing part is fully engaged with the vertical surface of the ratchet tip, forming a one-way locking state. The locking force is not less than 5N to prevent the strap from sliding in the opposite direction.

[0030] Specifically, the rotating pivot 63 is made of stainless steel with a diameter of 5mm and is nickel-plated to improve wear resistance; the vertical section of the pawl 64 is 1.5mm thick and has a clearance tolerance of H8 / g7 with the adjustment hole to ensure smooth sliding and no axial movement; the adjustment hole edge of the locking housing 62 is chamfered with a radius of 0.5mm to avoid stress concentration during the movement of the pawl 64. Through the mirror symmetry design of the two drive cavities, the locking force deviation of the pawls 64 on both sides to the ratchet guide rail 61 can be controlled within ±10%, ensuring the uniform force on the elastic adjustment belt 5 and improving the stability and adjustment accuracy of the overall structure.

[0031] A multi-segment adjustment component 67 with a Z-shaped bend is provided on the side of the long arm end of the pawl 64 away from the limit rod 65. The multi-segment adjustment component 67 has a trapezoidal hole with a width on the inside and a width on the outside. The hole is 3mm deep and the inclination angle of the trapezoidal hypotenuse is 45°. It is used to form a displacement guide structure for the hinge point. The trapezoidal hole is hinged to a reset drive component 68. The unlocking transmission chain formed by the multi-segment adjustment component 67 and the reset drive component 68 has a circumferential rotation angle range of 0-15°.

[0032] The reset drive assembly 68 includes a ball joint 681, a linkage push rod 682, a limit stop 683, and an adjustment button 684. The components are mechanically coupled to form a conductive unlocking control link. The ball part of the ball-shaped adjustment joint 681 is fixedly connected to one end of the linkage push rod 682. The ball-shaped adjustment joint 681 adopts a ball-and-socket hinge structure made of medical-grade stainless steel. The ball of the ball-shaped adjustment joint 681 matches the trapezoidal hole on the multi-segment adjustment component 67, allowing the ball-shaped adjustment joint 681 to achieve ±15° universal rotation in three-dimensional space through the linkage push rod 682.

[0033] The linkage push rod 682 is a tubular structure with an outer diameter of 6mm and a wall thickness of 1mm, and is made of aluminum alloy. The other end of the linkage push rod 682 is fixedly connected to the limiting block 683. The limiting block 683 is a circular plate structure with a diameter of 5mm. A guide hole with a diameter of 4mm is opened on one side of the drive cavity, which abuts against the limiting block 683, limiting the axial displacement of the push rod to within the range of 1.2±0.2mm.

[0034] The adjustment button 684 has a columnar structure. One end of the adjustment button 684 passes through the guide hole in the side wall of the locking housing 62 and extends to the outside. The surface is knurled to form an anti-slip texture of Ra1.6. The other end is fixed to the back of the limit block 683 to form a rigid mechanical coupling. The limit block 683 is used to prevent the adjustment button 684 from disengaging from the drive cavity.

[0035] When the adjustment button 684 is pressed, its axial force is transmitted to the limit stop 683, pushing the linkage push rod 682 to overcome the resistance of the tension spring 66 and move into the drive cavity 622. The omnidirectional rotation characteristic of the ball joint 681 can compensate for the ±10° pressing angle deviation, ensuring that the linkage push rod 682 stably drives the multi-stage adjustment component 67, forcing the pawl 64 to disengage from the ratchet guide rail 61. The mating surface between the adjustment button 684 and the limit stop 683 forms a hard stop point, preventing the pawl 64 from excessively disengaging from the ratchet guide rail 61 and causing locking failure. After the button is released, the reset spring drives the adjustment button 684 to automatically return to its original position, so that the V-shaped engagement part 641 of the pawl 64 and the ratchet line 611 re-enter the preset locking position.

[0036] The reset drive assembly 68 achieves unlocking with a low operating force of 0.5-1.2N through the multi-angle adaptability of the ball joint, the rigid transmission structure of the push rod, and the stroke control design of the limit plate.

[0037] The rotational connection angle between the skull positioning component 3 and the cranial restraint band 4 is 0-180° to accommodate the temporal bone tilt of different users. An elastic adjustment strap 5 is provided between the two anti-reverse locking devices 6. The two ends of the elastic adjustment strap 5 can be adjusted in one direction through the anti-reverse locking devices 6. The pretension of the elastic adjustment strap 5 is precisely controlled by the anti-reverse locking devices 6, so that the signal acquisition cap 1 is evenly pressed against the surface of the skull, effectively reducing displacement and shaking during wearing and improving the stability of EEG signal acquisition. The unlocking operation of the anti-reverse locking devices 6 can achieve quick removal and removal.

[0038] Specifically, the elastic adjustment strap 5 has a multi-layer composite structure, including an outer woven mesh and an inner memory spring; The outer woven mesh is made of polyester / spandex blend material, with an elastic deformation range of 20%-300%; The inner memory spring is made of 304 stainless steel wire woven into a spiral shape, with a pre-tension stress of 100-200N, providing rebound force.

[0039] Furthermore, the middle part of the elastic adjustment band 5 is connected to the chin soothing pad 7 via a detachable elastic connection component, extending along the axis of the elastic adjustment band 5, covering a length range of 8-12cm, and is suitable for the transition area from the chin to the neck of adults.

[0040] The detachable elastic connection assembly includes a U-shaped elastic connecting piece fixed to the bottom surface of the elastic adjustment strap 5, with its opening facing the human chin area, and a T-shaped connecting protrusion embedded in the top of the chin soothing pad 7, which forms a sliding snap-fit ​​with the U-shaped elastic connecting piece, allowing the chin soothing pad 7 to make an adaptive swing of ±15° in a direction perpendicular to the elastic adjustment strap 5.

[0041] The chin soothing pad 7 uses a three-layer composite structure, including a contact layer, a cushioning layer, and a support layer; The contact layer is made of medical-grade silicone material, and the surface is designed to conform to the anatomical curve of the mandible, with a radius of curvature R=38-42mm and a contact area of ​​not less than 80cm². The buffer layer is made of memory foam with a density of 20-30 kg / m³, and has evenly distributed breathable pores with a diameter of 2-3 mm inside. The support layer is a glass fiber reinforced nylon sheet, with a limiting groove at the edge that connects to the elastic adjustment strap 5.

[0042] When the elastic adjustment strap 5 adjusts the pretension through the anti-reverse locking device 6, the chin relaxation pad 7, through the elastic cooperation of the T-shaped connecting protrusion and the U-shaped elastic connecting piece, evenly distributes the strap tension to the mandibular ramus and chin area, keeping the local contact pressure within the range of 0.2-0.5 N / cm². Its swingable connection structure can adapt to the mandibular angle (100°-130°) of different users, avoiding the temporomandibular joint compression problem caused by traditional fixed pads. The three-layer composite structure provides rigid support while absorbing the dynamic displacement impact during wearing through the memory foam buffer layer. Combined with the breathable pore design, it can reduce the stuffiness and skin pressure marks during long-term wear.

[0043] To enable those skilled in the art to better understand the present invention, the above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

[0044] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

Claims

1. A dynamic strap adjustment structure for a non-invasive brain-computer interface device, comprising a signal acquisition cap (1) and non-invasive electrodes (2), wherein the signal acquisition cap (1) has a semi-circular flexible base structure, and the surface of the signal acquisition cap (1) is provided with multiple signal conduction holes corresponding to signal acquisition acupoints, each signal conduction hole being provided with a non-invasive electrode (2), and both sides of the signal acquisition cap (1) are provided with skull positioning components (3), and a cranial restraint band (4) is provided at the end of the skull positioning component (3), characterized in that, The end of the cranial restraint band (4) away from the skull positioning device (3) is connected to an anti-reverse locking device (6), and an elastic adjustment strap (5) is provided between the two anti-reverse locking devices (6).

2. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 1, characterized in that, The two skull positioning components (3) are set in a mirror image of each other; A detachable mandibular soothing pad (7) is attached to the middle of the elastic adjustment band (5), and the mandibular soothing pad (7) extends along the axial direction of the elastic adjustment band (5).

3. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 1, characterized in that, The anti-reverse locking device (6) includes a ratchet guide rail (61) on one side of the elastic adjustment belt (5), and a locking housing (62) is provided between the ratchet guide rail (61) and the outer side of the elastic adjustment belt (5). The locking housing (62) has a rectangular through structure. Two drive cavities are symmetrically arranged inside the locking housing (62) along the width direction. The axis of the drive cavity is perpendicular to the extension direction of the ratchet guide rail (61).

4. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 3, characterized in that, The outer side wall of the ratchet guide rail (61) is provided with isosceles trapezoidal ratchets that are evenly distributed along the length direction. The inclination angle of the isosceles trapezoidal ratchets is 60° to form a one-way locking guide structure.

5. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 4, characterized in that, Each drive chamber is rotatably connected to a rotating pivot (63) via a bearing. An adjustment hole is provided on each of the two drive chambers on opposite sides. The outer wall of the rotating pivot (63) is rotatably connected to a pawl (64) that engages with an isosceles trapezoidal ratchet via a bearing. The pawl (64) has an L-shaped plate structure. The outer wall of the rotating pivot (63) is located in the middle of the pawl (64). The pawl (64) passes through the adjustment hole and abuts against the isosceles trapezoidal ratchet on the ratchet guide rail (61). The short arm end of the pawl (64) is provided with a V-shaped meshing part that matches the isosceles trapezoidal ratchet. The long arm end is connected to the inner wall of the drive chamber via a tension spring (66).

6. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 5, characterized in that, Limiting rods (65) are provided on the inner wall of the drive cavity and the long arm end of the pawl (64). A tension spring (66) is provided between the outer walls of the two limiting rods (65) and forms a dynamic constraint with the tension spring (66).

7. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 6, characterized in that, A multi-segment adjustment component (67) with a Z-shaped bend is provided on the side of the long arm end of the pawl (64) away from the limit rod (65). The vertical segment of the multi-segment adjustment component (67) has a trapezoidal hole with a wider inner diameter and a narrower outer diameter. The trapezoidal hole is hinged to a reset drive assembly (68). The multi-segment adjustment component (67) and the reset drive assembly (68) form an unlocking transmission chain.

8. The dynamic strap adjustment structure for a non-invasive brain-computer interface device according to claim 7, characterized in that, The reset drive assembly (68) includes a ball joint (681), a linkage push rod (682), a limit stop (683), and an adjustment button (684). One end of the linkage push rod (682) is fixed to the ball joint (681), and the other end is mechanically coupled to the adjustment button (684) through the limit block (683). The limit block (683) is located in the drive cavity. One end of the adjustment button (684) passes through the side wall of the locking housing (62) and extends to the outside, and the other end is fixed to one side of the limit block (683).

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