Method for bidirectional adjustment and limiting of hip width

Abstract

The present application relates to the technical field of passive exoskeleton, and particularly relates to a method for bidirectional adjustment and limiting of hip width. The method comprises the following steps: in an initial state, each end surface ratchet is tightly engaged under the action of an elastic compression element, and is in a locked and limited state; when it is required to reduce the hip width, the left and right leg end surface ratchet connecting members are rotated towards each other, so that the outer engagement pairs are relatively rotated, and are re-engaged under the action of an elastic force after rotating through one ratchet tooth division angle; when it is required to expand the hip width, the left and right leg end surface ratchet connecting members are rotated away from each other, so that the inner engagement pairs are relatively rotated, and are re-engaged under the action of an elastic force after rotating through one ratchet tooth division angle; rotation is stopped after adjustment to a target width, and each end surface ratchet is in an engaged and locked state. The present application realizes bidirectional flexible adjustment and accurate limiting of the hip width, and effectively improves the adaptability and wearing comfort of a passive lower limb exoskeleton to users of different body types.

Description

Technical Field

[0001] This invention relates to the field of passive exoskeleton technology, specifically to a method for bidirectional adjustment and limiting of hip width. Background Technology

[0002] Passive lower limb exoskeletons, with their significant advantages of not requiring motor drive, lightweight structure, low power consumption, high reliability, and low cost, are widely used in medical rehabilitation, high-altitude operations, heavy object handling, and fire fighting and military scenarios. Compared with active exoskeletons, they are more suitable for general scenarios such as civilian daily wear, long-term industrial work, and routine rehabilitation training, and are one of the mainstream research and development directions in the field of lower limb assistive equipment.

[0003] The hip joint, as the core connecting joint between the human trunk and lower limbs, is a key component in the human-machine adaptation of passive lower limb exoskeletons. Its structural adaptability directly determines the wear fit, assistive effect, and safety of the exoskeleton. Significant differences exist in hip width among individuals, with users of different heights, body types, genders, and body postures exhibiting a wide range of hip sizes. Therefore, a universal design for the hip adjustment structure is a core technical point for improving the adaptability and universality of passive lower limb exoskeletons.

[0004] However, most existing passive lower limb exoskeletons use a fixed-size hip connection structure, which can only fit a small range of standard body types. They cannot achieve bidirectional flexible adjustment and precise positioning of the hip width, creating a blind spot for users with non-standard body types such as those who are too thin or too heavy. Furthermore, traditional hip adjustment structures lack a reliable bidirectional limiting mechanism, making them prone to problems such as structural loosening, displacement, and decreased fit during use. This not only reduces the exoskeleton's assist transmission efficiency and affects its auxiliary effect but also leads to uneven human-machine fit, localized compression, and significantly reduced wearing comfort. In severe cases, it can even cause exoskeleton imbalance, resulting in swaying, displacement, and other safety hazards, greatly limiting the applicable population and application scenarios of passive lower limb exoskeletons. Summary of the Invention

[0005] The purpose of this invention is to provide a method for bidirectional adjustment and limiting of hip width. It enables bidirectional flexible adjustment and precise positioning of hip width, effectively improving the fit, power transmission efficiency, and safety of use for users of different body types, and enhancing the universality and comfort of the exoskeleton.

[0006] To achieve the above objectives, the technical solution of this application is as follows: a bidirectional adjustment and limiting method for hip width, applied to a passive lower limb exoskeleton. The passive lower limb exoskeleton includes a right leg end-face ratchet connector, a first double-sided end-face ratchet, a second double-sided end-face ratchet, a left leg end-face ratchet connector, an elastic clamping element, and a fixing rod. The right leg end-face ratchet connector, the first double-sided end-face ratchet, the second double-sided end-face ratchet, and the left leg end-face ratchet connector are stacked sequentially and coaxially rotated. Adjacent end-face ratchets mesh with each other through a ring-shaped tooth structure. The method includes the following steps: In the initial state, the right leg end face ratchet connector, the first double-sided end face ratchet, the second double-sided end face ratchet, and the left leg end face ratchet connector are tightly fitted together under the elastic force of the elastic clamping element, and the annular tooth structure of each adjacent end face ratchet meshes with each other, and the overall structure is in a locked and limited state. When it is necessary to reduce the width of the hip, the ratchet connector on the right leg end face and the ratchet connector on the left leg end face are rotated toward each other, so that the first set of meshing pairs rotate relative to each other by friction. After each relative rotation through a ratchet pitch angle, they are re-engaged tightly under the elastic restoring force of the elastic clamping element, so as to achieve step-by-step size adjustment. When it is necessary to increase the width of the hip, the ratchet connector on the right leg end face and the ratchet connector on the left leg end face are rotated in a direction away from each other, so that the second set of meshing pairs rotate relative to each other by friction. After each relative rotation through a ratchet pitch angle, they are re-engaged tightly under the elastic restoring force of the elastic clamping element, so as to achieve step-by-step size adjustment. After adjusting to the target width, stop rotating; the ratchet wheels on each end face will be in a locked engagement state.

[0007] In one embodiment, the first set of engagement pairs includes the engagement pair between the right leg end face ratchet connector and the first double-sided end face ratchet, and the engagement pair between the left leg end face ratchet connector and the second double-sided end face ratchet; the first double-sided end face ratchet and the second double-sided end face ratchet limit each other and remain relatively stationary during the hip width reduction adjustment process.

[0008] In one embodiment, the second set of engagement pairs includes the engagement pair between the first double-sided end-face ratchet and the second double-sided end-face ratchet; the right leg end-face ratchet connector and the first double-sided end-face ratchet, as well as the left leg end-face ratchet connector and the second double-sided end-face ratchet, mutually limit each other and remain relatively stationary during the hip width adjustment process.

[0009] In one embodiment, when it is necessary to reduce the hip width, after adjusting to the target width and stopping the rotation, if an attempt is made to rotate in a direction away from each other, the meshing surfaces are mutually limited and remain relatively stationary due to the tooth-shaped limiting effect.

[0010] In one embodiment, when it is necessary to increase the hip width, after adjusting to the target width and stopping the rotation, if an attempt is made to rotate in a direction that moves closer to each other, the meshing surfaces are mutually limited and remain relatively stationary due to the tooth-shaped limiting effect.

[0011] In one embodiment, after each relative rotation through a ratchet pitch angle, the elastic clamping element provides an axial elastic clamping force to re-engage the ratchet wheels on each end face tightly, wherein the ratchet pitch angle is ≤12°.

[0012] In one embodiment, the elastic clamping element is a conical spring, with its small end placed in the placement groove of the ratchet connector on the left leg end face and its large end placed in the placement groove of the spring fixing plate, which is located at the bottom layer of the passive lower limb exoskeleton.

[0013] In one embodiment, the right leg end face ratchet connector, the first double-sided end face ratchet, the second double-sided end face ratchet, and the left leg end face ratchet connector are coaxially and coplanarly arranged, and the fixing rod passes through each layered component axially.

[0014] In one embodiment, the right leg end face ratchet connector, the first double-sided end face ratchet, the second double-sided end face ratchet, and the left leg end face ratchet connector rotate relative to the fixed rod through a deep groove ball bearing installed at the central through hole.

[0015] In one embodiment, the fixing rod passes through each stacked component and is locked at its end by a locking member, which is a bolt with its external thread threaded to the internal thread of the fixing rod, for axially clamping all the stacked components.

[0016] By adopting the above technical solution, the present invention can achieve the following technical effects: 1. This invention achieves bidirectional flexible adjustment and precise limiting of hip width by switching between different end-face ratchet engagement pairs under different rotation directions. When the two leg pieces rotate towards each other, adjustment is achieved by the relative rotation of the outer end-face ratchet engagement pairs (right leg end-face ratchet connector and first double-sided end-face ratchet, left leg end-face ratchet connector and second double-sided end-face ratchet); when the two leg pieces rotate away from each other, adjustment is achieved by the relative rotation of the inner end-face ratchet engagement pairs (first double-sided end-face ratchet and second double-sided end-face ratchet). Each time the ratchet passes a ratchet pitch angle (≤12°), the elastic clamping element presses and re-engages, thus achieving multi-level, stepless size adjustment. This effectively solves the technical problems of narrow fit and limited adjustment caused by the fixed design of existing structures, significantly improving the applicability and fit of the passive lower limb exoskeleton for users of different body types.

[0017] 2. The present invention is equipped with an elastic clamping element, which uses its axial elastic force to automatically clamp all the stacked components after each rotation adjustment, ensuring that the ratchet on each end face always remains tightly engaged, effectively preventing problems such as structural loosening, displacement, or decreased fit caused by force fluctuations during wear and use, greatly improving the stability and reliability of the limiting structure, and ensuring the efficiency of power transmission and safety of use.

[0018] 3. The ratchet components on each end face of this invention adopt a hollow design, which effectively reduces the overall weight and the burden on the user. Deep groove ball bearings are installed at the central through-holes of each component, making the rotation of each component relative to the fixed rod smoother during adjustment, reducing friction loss and extending service life. It is particularly suitable for passive lower limb exoskeletons applications requiring frequent donning and rapid adaptation, such as heavy object handling, firefighting, and military use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the breakdown of a passive lower limb exoskeleton; Figure 2 Front view of a passive lower limb exoskeleton; Figure 3 Left view of a passive lower limb exoskeleton; Figure 4 Top view of a passive lower limb exoskeleton; Figure 5 This is a cross-sectional view of the core region of a passive lower limb exoskeleton. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative order and numerical values ​​of the steps described in these embodiments do not limit the scope of the invention. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail.

[0024] Example 1 This embodiment provides a bidirectional adjustment and limiting method for hip width, applied to a passive lower limb exoskeleton, including: In the initial state, the right leg end face ratchet connector 1, the first double-sided end face ratchet 2, the second double-sided end face ratchet 3, and the left leg end face ratchet connector 4 are tightly fitted together under the elastic force of the conical spring 6, and the annular tooth structure of each adjacent end face ratchet meshes with each other, and the overall structure is in a locked and limited state.

[0025] When hip width needs to be reduced, the operator rotates the right leg end-face ratchet connector 1 and the left leg end-face ratchet connector 4 towards each other. During this process, due to the structure of the end-face ratchet, the first double-sided end-face ratchet 2 and the second double-sided end-face ratchet 3 are mutually restrained and remain relatively stationary; the right leg end-face ratchet connector 1 and the first double-sided end-face ratchet 2 rotate relative to each other through friction, while the left leg end-face ratchet connector 4 and the second double-sided end-face ratchet 3 rotate relative to each other through friction. The above rotation creates an axial separation gap between the meshing surfaces. After each relative rotation through a ratchet pitch angle (preferably 12°), under the elastic restoring force of the conical spring 6, the right leg end-face ratchet connector 1 and the first double-sided end-face ratchet 2, and the left leg end-face ratchet connector 4 and the second double-sided end-face ratchet 3, re-engage tightly, achieving one size adjustment. After adjusting to the target width, stop rotating. At this time, the ratchet on each end face is in a locked state. If you try to rotate in the opposite direction (the direction away from each other), due to the tooth-shaped limiting effect, each meshing surface is mutually limited and remains relatively stationary, thereby achieving precise limiting.

[0026] When hip width needs to be increased, the operator rotates the right leg end-face ratchet connector 1 and the left leg end-face ratchet connector 4 in a direction away from each other. During this process, due to the structure of the end-face ratchet, the right leg end-face ratchet connector 1 and the first double-sided end-face ratchet 2 are mutually restrained and remain relatively stationary, and the left leg end-face ratchet connector 4 and the second double-sided end-face ratchet 3 are also mutually restrained and remain relatively stationary. At this time, the first double-sided end-face ratchet 2 and the second double-sided end-face ratchet 3 rotate relative to each other through friction, generating an axial separation gap. After each relative rotation through a ratchet pitch angle (preferably 12°), under the elastic restoring force of the conical spring 6, the first double-sided end-face ratchet 2 and the second double-sided end-face ratchet 3 re-engage tightly. After adjusting to the target width, rotation is stopped, and each end-face ratchet is re-engaged and locked, achieving stable restraint.

[0027] Throughout the adjustment process, the conical spring 6 consistently provides axial elastic clamping force, ensuring that the ratchet wheels on each end face can quickly and accurately re-engage after each rotation, preventing limit failure due to gaps. The deep groove ball bearings 501, 502, 503, and 504 ensure smooth rotation of each component relative to the fixed rod 8 during adjustment, reducing frictional resistance and making the adjustment operation more effortless and stable.

[0028] Example 2: like Figure 1-5 As shown, the passive lower limb exoskeleton includes a right leg end-face ratchet connector 1, a first double-sided end-face ratchet 2, a second double-sided end-face ratchet 3, a left leg end-face ratchet connector 4, four deep groove ball bearings, a conical spring 6, a spring fixing plate 7, a fixing rod 8, and a bolt 9. The right leg end-face ratchet connector 1 is located on the top layer of the overall structure, the first double-sided end-face ratchet 2 is located below the right leg end-face ratchet connector 1, the second double-sided end-face ratchet 3 is located below the first double-sided end-face ratchet 2, and the left leg end-face ratchet connector 4 is located below the second double-sided end-face ratchet 3. The four deep groove ball bearings are coaxially and coplanarly arranged with the right leg end-face ratchet connector 1, the first double-sided end-face ratchet 2, the second double-sided end-face ratchet 3, and the left leg end-face ratchet connector 4, respectively. The conical spring 6 is located below the left leg end-face ratchet connector 4, the spring fixing plate 7 is located on the bottom layer of the overall structure, and the fixing rod 8 and bolt 9 penetrate the overall structure.

[0029] The right leg end face ratchet connector 1 includes a right leg main rod and a single-sided end face ratchet. One side of the single-sided end face ratchet has an annular tooth structure. Preferably, the annular tooth structure has 30 teeth arranged without gaps, and the ratchet pitch angle is 12°. It should be noted that the present invention is not limited to the specific values ​​of the number of teeth and the ratchet pitch angle. Those skilled in the art can make adaptive adjustments to the number of teeth and the ratchet pitch angle according to actual application requirements. The single-sided end face ratchet has a hollow structure and a through hole in the center. A deep groove ball bearing 501 is installed at the through hole.

[0030] The first double-sided ratchet 2 has a symmetrical annular tooth structure on both sides. Each side of the annular tooth structure preferably has 30 teeth arranged without gaps, and the ratchet pitch angle is 12°. It should be noted that the present invention is not limited to the specific values ​​of the number of teeth and the ratchet pitch angle mentioned above. Those skilled in the art can adaptively adjust the number of teeth and the ratchet pitch angle according to actual application requirements. The first double-sided ratchet 2 has a hollow structure and a through hole in the center, where a deep groove ball bearing 502 is installed. The two sides of the first double-sided ratchet 2 respectively mesh with the right leg end-face ratchet connector 1 and the second double-sided ratchet 3.

[0031] The second double-sided ratchet 3 has a symmetrical annular tooth structure on both sides. Each side of the annular tooth structure preferably has 30 teeth arranged without gaps, and the ratchet pitch angle is 12°. It should be noted that the present invention is not limited to the specific values ​​of the number of teeth and the ratchet pitch angle mentioned above. Those skilled in the art can adaptively adjust the number of teeth and the ratchet pitch angle according to actual application requirements. The second double-sided ratchet 3 has a hollow structure and a through hole in the center, where a deep groove ball bearing 503 is installed. The two sides of the second double-sided ratchet 3 respectively engage with the first double-sided ratchet 2 and the left leg end-face ratchet connector 4.

[0032] The left leg end face ratchet connector 4 comprises a left leg main rod and a single-sided end face ratchet. One side of the single-sided end face ratchet has a ring-shaped tooth structure, preferably with 30 teeth arranged without gaps, and a ratchet pitch angle of 12°. It should be noted that the present invention is not limited to the specific values ​​of the number of teeth and the ratchet pitch angle mentioned above. Those skilled in the art can make adaptive adjustments to the number of teeth and the ratchet pitch angle according to actual application requirements. The other side is provided with a conical spring small end placement groove. The single-sided end face ratchet has a hollow structure and a through hole in the center, at which a deep groove ball bearing 504 is installed. The single-sided end face ratchet of the left leg end face ratchet connector 4 meshes with the second double-sided end face ratchet 3.

[0033] The spring fixing plate 7 has a through hole structure in the middle. One side of it is provided with a groove for placing the large end of the conical spring 6, and the other side is provided with a limiting groove for the fixing rod 8, which is used to ensure that the position of the conical spring 6 is fixed and to prevent position displacement during rotation and adjustment.

[0034] The small end of the conical spring 6 is placed in the placement groove of the single-sided end face ratchet of the left leg end face ratchet connector 4, and the large end of the conical spring 6 is placed in the placement groove of the spring fixing piece 7. This ensures that the position of the conical spring 6 is fixed and will not shift during rotation adjustment. Due to the structure of the end face ratchet, gaps will be generated between the end face ratchets when adjusting the size. The purpose of installing the conical spring 6 is to ensure that after each rotation, the elasticity of the conical spring 6 will press the entire structure tightly, so that the right leg end face ratchet connector 1, the first double-sided end face ratchet 2, the second double-sided end face ratchet 3 and the left leg end face ratchet connector 4 fit tightly together, avoiding misalignment and failure to limit the position.

[0035] The fixing rod 8 passes sequentially through the spring fixing plate 7, the conical spring 6, the single-sided ratchet of the left leg end face ratchet connector 4, the deep groove ball bearing 504 installed on the left leg end face ratchet connector 4, the second double-sided ratchet 3, the deep groove ball bearing 503 installed on the second double-sided ratchet 3, the first double-sided ratchet 2, the deep groove ball bearing 502 installed on the first double-sided ratchet 2, the single-sided ratchet of the right leg end face ratchet connector 1, and the deep groove ball bearing 501 installed on the right leg end face ratchet connector 1, and the head of the fixing rod 8 is inserted into the limiting groove of the spring fixing plate 7.

[0036] The external thread of the bolt 9 is threadedly connected to the internal thread of the fixing rod 8, and is used to axially clamp all the above-mentioned stacked components. The length of the fixing rod 8 should ensure that after the external thread of the bolt 9 is in complete contact with the internal thread of the fixing rod 8, the right leg end face ratchet connector 1, the first double-sided end face ratchet 2, the second double-sided end face ratchet 3 and the left leg end face ratchet connector 4 are tightly fitted and the conical spring 6 is fully extended.

[0037] The components of this invention feature a hollow design, which makes the structure lighter and reduces the burden of wearing them; the ratchet on each end face is arranged with multiple teeth without gaps, which can achieve stepless adjustment; bearings are installed at the through holes of each component to make the adjustment process smoother, reduce the friction between each component and the fixing rod, and ensure its service life.

[0038] This invention can be flexibly adjusted in both directions (towards or away from each other) according to the width of the human hip. The accuracy of each adjustment step is determined by the ratchet pitch angle (preferably 12°). It has a large adjustment range, high precision, and is easy to operate. It is suitable for various passive lower limb exoskeleton applications such as medical rehabilitation, high-altitude operations, heavy object handling, and fire fighting and military applications.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A bidirectional adjustment and limiting method for hip width, applied to a passive lower limb exoskeleton, characterized in that, The passive lower limb exoskeleton includes a right leg end face ratchet connector (1), a first double-sided end face ratchet (2), a second double-sided end face ratchet (3), a left leg end face ratchet connector (4), an elastic clamping element (6), and a fixing rod (8). The right leg end face ratchet connector (1), the first double-sided end face ratchet (2), the second double-sided end face ratchet (3), and the left leg end face ratchet connector (4) are stacked sequentially and rotated coaxially. The adjacent end face ratchets mesh with each other through a ring tooth structure. The process includes the following steps: In the initial state, the right leg end face ratchet connector (1), the first double-sided end face ratchet (2), the second double-sided end face ratchet (3), and the left leg end face ratchet connector (4) are tightly fitted together under the elastic force of the elastic pressing element (6), and the annular tooth structure of each adjacent end face ratchet meshes with each other, and the overall structure is in a locked and limited state. When it is necessary to reduce the width of the hip, the right leg end face ratchet connector (1) and the left leg end face ratchet connector (4) are rotated in a direction that brings them closer to each other, so that the first set of meshing pairs rotate relative to each other by friction. After each relative rotation through a ratchet pitch angle, they re-engage tightly under the elastic restoring force of the elastic pressing element to achieve step-by-step size adjustment. When it is necessary to increase the width of the hip, the right leg end face ratchet connector (1) and the left leg end face ratchet connector (4) are rotated in a direction away from each other, so that the second set of meshing pairs rotate relative to each other by friction. After each relative rotation through a ratchet pitch angle, they are re-engaged tightly under the elastic restoring force of the elastic pressing element (6) to achieve step-by-step size adjustment. After adjusting to the target width, stop rotating; the ratchet wheels on each end face will be in a locked engagement state.

2. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The first set of meshing pairs includes the meshing pair between the right leg end face ratchet connector (1) and the first double-sided end face ratchet (2), and the meshing pair between the left leg end face ratchet connector (4) and the second double-sided end face ratchet (3); the first double-sided end face ratchet (2) and the second double-sided end face ratchet (3) limit each other and remain relatively stationary during the process of reducing hip width adjustment.

3. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The second set of meshing pairs includes the meshing pair between the first double-sided end face ratchet (2) and the second double-sided end face ratchet (3); the right leg end face ratchet connector (1) and the first double-sided end face ratchet (2) and the left leg end face ratchet connector (4) and the second double-sided end face ratchet (3) limit each other and remain relatively stationary during the process of widening the hip width adjustment.

4. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, When it is necessary to reduce the hip width, after adjusting to the target width and stopping the rotation, if you try to rotate in a direction away from each other, the meshing surfaces will be mutually limited and remain relatively stationary due to the tooth-shaped limiting effect.

5. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, When it is necessary to increase the width of the hip, after adjusting to the target width and stopping the rotation, if you try to rotate in a direction that moves closer to each other, the meshing surfaces will be mutually limited and remain relatively stationary due to the tooth-shaped limiting effect.

6. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, After each relative rotation through a ratchet pitch angle, the elastic clamping element (6) provides an axial elastic clamping force, so that the ratchets on each end face re-engage tightly, and the ratchet pitch angle is ≤12°.

7. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The elastic clamping element (6) is a conical spring, with its small end placed in the placement groove of the ratchet connector (4) on the left leg end face and its large end placed in the placement groove of the spring fixing plate (7). The spring fixing plate (7) is located at the bottom layer of the passive lower limb exoskeleton.

8. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The right leg end face ratchet connector (1), the first double-sided end face ratchet (2), the second double-sided end face ratchet (3) and the left leg end face ratchet connector (4) are coaxially and coplanarly arranged, and the fixing rod (8) passes through each layered component along the axial direction.

9. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The right leg end face ratchet connector (1), the first double-sided end face ratchet (2), the second double-sided end face ratchet (3), and the left leg end face ratchet connector (4) rotate relative to the fixed rod (8) through the deep groove ball bearing installed at the central through hole.

10. The method for bidirectional adjustment and limiting of hip width according to claim 1, characterized in that, The fixing rod (8) passes through each stacked component and is locked at the end by a locking member (9). The locking member (9) is a bolt, whose external thread is threaded to the internal thread of the fixing rod (8) for axially clamping all stacked components.

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