A compression-torsion ratchet buffer structure based on additive manufacturing

Abstract

The application discloses a kind of compression-torsion ratchet buffer structure based on additive manufacturing, it is related to the technical field of mechanical metamaterial, solve the problem that existing compression-torsion coupling structure energy dissipation effect is limited, easy to rebound.The application includes two upper and lower plates, middle plate, several inclined rods and anti-rebound structure;Middle plate is arranged between two upper and lower plates, and anti-rebound structure is arranged in the inner ring of middle plate;Anti-rebound structure includes middle ring and locking structure, middle ring, locking structure and middle plate are sequentially connected from inside to outside;Middle plate, middle ring are connected by inclined rod and two upper and lower plates;Extrusion upper and lower plate, middle plate and middle ring generate opposite direction rotation under the action of inclined rod;Locking structure fixes the position of middle ring, and middle ring prevents the rebound of upper and lower plate by inclined rod.The application realizes multi-stable energy absorption effect by internal ratchet design, and can effectively inhibit secondary rebound after impact.Meanwhile, shape memory material is manufactured based on additive manufacturing, and the structure is repeatedly used by shape memory recovery.

Description

Technical Field

[0001] This invention relates to the field of mechanical metamaterials technology, specifically to a pressure-torsion ratchet buffer structure based on additive manufacturing. Background Technology

[0002] Mechanical metamaterials are a class of advanced material systems that, through artificial design and construction, break through the boundaries of the mechanical properties of natural materials. Their core lies in achieving highly programmable control over macroscopic mechanical responses through the refined and strategic arrangement of internal repeating units, thereby obtaining superior properties that are difficult for traditional materials to achieve. Among them, compression-torsion coupled structures, as a typical representative of this field, rely on their unique compression-torsion coupling effect to break through the framework of classical Cauchy continuum mechanics theory, and have attracted widespread attention in fields such as impact buffering and energy absorption.

[0003] Current pressure-torsion coupling structures typically have limited energy dissipation effects and are prone to secondary rebound due to their own elastic recovery after being impacted, which severely restricts their application in buffering and energy absorption scenarios. Summary of the Invention

[0004] To address the limitations of existing pressure-torsion coupling structures in terms of limited energy dissipation and susceptibility to rebound, this invention proposes a pressure-torsion ratchet buffer structure based on additive manufacturing. This invention achieves multi-steady-state energy absorption through its internal ratchet design and effectively suppresses secondary rebound after impact.

[0005] This invention proposes a pressure-torsion ratchet buffer structure based on additive manufacturing, which specifically includes two upper and lower plates, a middle plate, several diagonal rods, and an anti-rebound structure. The middle plate is disposed between the two upper and lower plates, and the anti-rebound structure is provided on the inner ring of the middle plate. The anti-rebound structure includes a middle ring and a locking structure, and the middle ring, locking structure, and middle plate are connected sequentially from the inside to the outside. The middle plate and the middle ring are connected to the two upper and lower plates through several diagonal rods. The diagonal rods on the middle plate and the diagonal rods on the middle ring have opposite inclination directions. When the upper and lower plates are pressed, the middle plate and the middle ring rotate in opposite directions under the action of the diagonal rods. The locking structure fixes the position of the middle ring, and the middle ring prevents the upper and lower plates from rebounding through the diagonal rods.

[0006] Furthermore, the locking structure includes several cranks and a rotating ratchet, with the rotating ratchet located on the inner ring of the middle plate; one end of the crank is connected to the middle ring, and the pawl at the other end engages with the ratchet teeth of the rotating ratchet.

[0007] Furthermore, the outer ring of the rotating ratchet is provided with a slider, which is embedded in the slide rail of the inner ring of the middle plate.

[0008] Furthermore, the middle plate is provided with several threaded holes, and set screws are provided in the threaded holes, with the ends of the set screws pressing against the slider.

[0009] Furthermore, one end of the crank is provided with a crank tenon, which is inserted into the crank groove on the middle ring.

[0010] Furthermore, the end of the diagonal bar is provided with a dovetail tenon, which is inserted into the trapezoidal groove of the upper and lower plates, the middle plate, or the middle ring.

[0011] Furthermore, the diagonal brace above the middle plate and the corresponding diagonal brace below it are symmetrical about the middle plate.

[0012] Furthermore, the diagonal bar above the central ring and the corresponding diagonal bar below it are symmetrical about the central ring.

[0013] The beneficial effects of the additive manufacturing-based pressure-torsion ratchet buffer structure described in this invention are as follows: (1) The additive manufacturing-based pressure-torsion ratchet buffer structure of the present invention, when the entire buffer structure is compressed, the inner and outer inclined rods are tilted in opposite directions, causing the middle plate and the middle ring to rotate in opposite directions. The middle ring pulls the upper and lower plates through the inclined rods. The anti-rebound structure formed by the middle ring, the curved rod and the rotating ratchet prevents the upper and lower plates from rebounding, thus overcoming the problem that the traditional pressure-torsion coupling structure has limited energy dissipation effect and is prone to secondary rebound due to its own elastic recovery after being impacted.

[0014] (2) The pressure-torsion ratchet buffer structure based on additive manufacturing described in this invention is made of shape memory material based on additive manufacturing, and can be reused multiple times through shape memory recovery.

[0015] (3) The additive manufacturing-based pressure-torsion ratchet buffer structure described in this invention solves the problem of the difficulty in removing the integrated 3D printed support by printing the parts separately and then assembling them. It is simple to manufacture and saves resources. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of a pressure-torsion ratchet buffer structure based on additive manufacturing as described in this invention; Figure 2 This is a schematic diagram of the upper and lower plates of a pressure-torsion ratchet buffer structure based on additive manufacturing as described in this invention; Figure 3 This is a schematic diagram of the middle plate of a pressure-torsion ratchet buffer structure based on additive manufacturing as described in this invention; Figure 4This is a schematic diagram of the anti-rebound structure of a pressure-torsion ratchet buffer structure based on additive manufacturing, as described in this invention. Figure 5 This is a top view of an anti-rebound structure based on an additive manufacturing-based pressure-torsion ratchet buffer structure, as described in this invention. Figure 6 This is an assembly diagram of the middle plate and the anti-rebound structure of a pressure-torsion ratchet buffer structure based on additive manufacturing, as described in this invention. Figure 7 This is a schematic diagram of the set screw arrangement of a pressure-torsion ratchet buffer structure based on additive manufacturing as described in this invention; Wherein: 1-upper and lower plates; 101-outer groove; 102-inner groove; 2-middle plate; 201-slide rail; 202-middle plate groove; 203-threaded hole; 3-diagonal rod; 4-set screw; 5-middle ring; 501-cranked rod groove; 502-diagonal rod groove; 6-cranked rod; 601-pawl; 602-cranked rod tenon; 7-rotating ratchet; 701-racket tooth; 702-slider. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Specific implementation method one: See Figures 1-7 This embodiment is described in detail. The additive manufacturing-based pressure-torsion ratchet buffer structure described in this embodiment specifically includes two upper and lower plates 1, a middle plate 2, several diagonal rods 3, and an anti-rebound structure. For example... Figure 2 As shown, the upper and lower plates 1 are generally hollow annular thin plates. Each outer and inner wall has two identical trapezoidal grooves. The eight grooves arranged circumferentially along the outer wall are called outer grooves 101, and the eight grooves arranged circumferentially along the inner wall are called inner grooves 102. (See diagram) Figure 3 As shown, the middle plate 2 has a ring structure, with four identical middle plate grooves 202 arranged symmetrically on its four outer walls in the cross direction. Figure 1As shown, the diagonal brace 3 is an inclined rod configuration with dovetail tenons at both ends. The middle plate 2 is positioned between the two upper and lower plates 1, and the diagonal brace 3 is inclined between the middle plate 2 and the upper and lower plates 1. One end of the diagonal brace 3 is inserted into the middle plate groove 202, and the other end is inserted into the outer groove 101. The diagonal brace 3 achieves a reliable connection between the upper and lower plates 1 and the middle plate 2 through an interference fit with the outer groove 101 and the middle plate groove 202. Among them, the four diagonal braces 3 on the upper layer of the middle plate 2 are arranged circumferentially with the same inclination direction, and the four diagonal braces 3 on the lower layer are arranged in a mirror symmetrical manner with respect to the upper four diagonal braces 3 about the middle plate 2.

[0020] like Figure 4 and Figure 5 As shown, the inner ring of the middle plate 2 is provided with an anti-rebound structure; the anti-rebound structure includes a middle ring 5; the middle ring 5 is an octagonal ring structure, and is located inside the middle plate 2 and coaxial with the middle plate 2. The outer wall of the middle ring 5 is provided with one curved rod groove 501 or four identical inclined rod grooves 502, with the curved rod groove 501 and inclined rod grooves 502 alternately arranged on different wall surfaces. One end of the inclined rod 3 is inserted into the inclined rod groove 502, and the other end is inserted into the inner groove 102. The inclined rod 3 can achieve a reliable connection between the upper and lower plates 1 and the middle ring 5 through an interference fit with the inner groove 102 and the inclined rod groove 502. The four inclined rods 3 on the upper layer of the middle ring 5 are arranged circumferentially in the same inclination direction, and the four inclined rods 3 on the lower layer of the middle ring 5 are arranged in a mirror-symmetric manner with respect to the upper layer about the middle ring 5. The inclined direction of the diagonal bar 3 set on the middle ring 5 is opposite to that of the inclined bar 3 set on the corresponding middle plate 2, so as to ensure that the middle plate 2 and the middle ring 5 exhibit opposite torsional effects under compressive load.

[0021] The anti-rebound structure also includes four cranks 6 and a rotating ratchet 7; the rotating ratchet 7 has an annular slider 702 on its outer side, which is inserted into the slide rail 201 on the inner side of the middle plate 2. The rotating ratchet 7 is installed inside the middle plate 2 through the clearance fit between the slider 702 and the slide rail 201, and is allowed to rotate freely; the rotating ratchet 7 has a ratchet tooth 701 on its inner side, one end of which is an inclined tooth and the other end is a vertical tooth. The crank 6 is a curved rod configuration, with a dovetail-shaped crank tenon 602 at one end and a pawl 601 at the other end. The crank tenon 602 is inserted into the crank groove 501 and installed on the outer wall of the middle ring 5 by interference fit. The tails of the four cranks 6 are aligned. The pawl 601 is the same shape as the ratchet 701 and is locked in the ratchet 701, so that it can rotate unidirectionally in the clockwise direction in the ratchet 701. Thus, the crank 6 and the rotating ratchet 7 cooperate to form a unidirectional locking structure, allowing only the middle ring 5 to rotate in one direction.

[0022] like Figure 7As shown, the middle plate 2 is provided with four threaded holes 203, and set screws 4 are provided in the threaded holes 203. The ends of the set screws 4 are in contact with the slider 702. When buffering and energy absorption are required, the four set screws 4 are tightened first to prevent the rotating ratchet 7 from rotating. Then the upper and lower plates 1 are compressed. Since the inclination directions of the inner and outer diagonal bars 3 are opposite and the upper and lower diagonal bars 3 are arranged in a mirror image, when viewed from top to bottom, the outer middle plate 2 is rotated counterclockwise and the inner middle ring 5 is rotated clockwise. Since the pawls 601 at the ends of the four cranks 6 only allow unidirectional rotation, when compression stops, the pawls 601 can be locked on the vertical teeth of the ratchet 702 to prevent structural rebound. In addition, due to the locking deformation effect of the ratchet 601, a multi-steady-state mechanical response can occur during compression, thereby enhancing the energy absorption effect during compression.

[0023] The diagonal brace 3 is made of shape memory material based on additive manufacturing. After use, the four set screws 4 are loosened to release the torsional freedom of the rotating ratchet 7. Under the elastic restoring force of the diagonal brace 3, the pawl 601 can push the rotating ratchet 7 to rotate counterclockwise, while the middle plate 2 returns to its original clockwise position. When the diagonal brace 3 is heated, due to the shape memory recovery capability of the material, the middle plate 2 and the rotating ratchet 7 continue to rotate in opposite directions through the clearance fit of the slide rail 201 and the slider 702 until the structure returns to its initial height, thus achieving reusable buffer energy absorption.

[0024] In summary, the additive manufacturing-based pressure-torsion ratchet buffer structure of this invention, when the entire buffer structure is compressed, causes the middle plate 2 and the middle ring 5 to rotate in opposite directions due to the opposite inclination directions of the inner and outer inclined rods 3. The middle ring 5 pulls the upper and lower plates 1 through the inclined rods 3. The anti-rebound structure formed by the middle ring 5, the curved rod 6, and the rotating ratchet 7 prevents the upper and lower plates 1 from rebounding, overcoming the problems of limited energy dissipation and easy secondary rebound due to elastic recovery after impact in traditional pressure-torsion coupling structures. The additive manufacturing-based pressure-torsion ratchet buffer structure of this invention is made of shape memory material based on additive manufacturing, which can be reused multiple times through shape memory recovery. The additive manufacturing-based pressure-torsion ratchet buffer structure of this invention solves the problem of the difficulty in removing the support of integrated 3D printing by printing the parts separately and then assembling them, which is simple to manufacture and saves resources.

[0025] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the invention. They can also be reasonable combinations of the features described in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure-torsion ratchet buffer structure based on additive manufacturing, characterized in that: It includes two upper and lower plates (1), a middle plate (2), several diagonal rods (3) and an anti-rebound structure; the middle plate (2) is set between the two upper and lower plates (1), and the inner ring of the middle plate (2) is provided with an anti-rebound structure; the anti-rebound structure includes a middle ring (5) and a locking structure, and the middle ring (5), the locking structure and the middle plate (2) are connected from the inside to the outside in sequence; the middle plate (2) and the middle ring (5) are connected to the two upper and lower plates (1) through several diagonal rods (3); the diagonal rods (3) on the middle plate (2) and the diagonal rods (3) on the middle ring (5) are inclined in opposite directions; when the upper and lower plates (1) are squeezed, the middle plate (2) and the middle ring (5) rotate in opposite directions under the action of the diagonal rods (3), the locking structure fixes the position of the middle ring (5), and the middle ring (5) prevents the upper and lower plates (1) from rebounding through the diagonal rods (3).

2. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 1, characterized in that: The locking structure includes several cranks (6) and a rotating ratchet (7), with the rotating ratchet (7) located on the inner ring of the middle plate (2); one end of the crank (6) is connected to the middle ring (5), and the pawl (601) at the other end engages with the ratchet tooth (701) of the rotating ratchet (7).

3. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 2, characterized in that: The outer ring of the rotating ratchet (7) is provided with a slider (702), which is embedded in the slide rail (201) of the inner ring of the middle plate (2).

4. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 3, characterized in that: The middle plate (2) is provided with several threaded holes (203), and set screws (4) are provided in the threaded holes (203). The end of the set screws (4) is pressed against the slider (702).

5. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 2, characterized in that: One end of the crank (6) is provided with a crank tenon (602), which is inserted into the crank groove (501) on the middle ring (5).

6. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 1, characterized in that: The end of the diagonal bar (3) is provided with a dovetail tenon, which is inserted into the trapezoidal groove of the upper and lower plates (1), the middle plate (2) or the middle ring (5).

7. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 6, characterized in that: The diagonal bar (3) above the middle plate (2) and the corresponding diagonal bar (3) below it are symmetrical about the middle plate (2).

8. The additive manufacturing-based pressure-torsion ratchet buffer structure according to claim 6, characterized in that: The diagonal bar (3) above the middle ring (5) and the corresponding diagonal bar (3) below it are symmetrical about the middle ring (5).

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