Labyrinth-like interlock smart structure based on 4d printing and lock method thereof

Abstract

To provide a labyrinth-like interlock smart structure based on 4D printing and a lock method thereof.SOLUTION: One end of a long non-execution segment of an interlock smart structure is fixed to a connection body, a lock execution unit and a short non-execution segment are arranged alternately in order with their ends connected together to form a lock segment, and the lock segment is connected via a lock execution unit on one end to the other end of the long non-execution segment. A method includes the steps of arranging, between two target connection bodies, two labyrinth-like interlock smart structures in homochirality in opposite directions alternately, forming a labyrinth-like engaging interlock state by inflection and deformation of a lock execution unit by external stimulation, and finally locking two target connection bodies by removing the external stimulation and restoring a strength of the lock execution unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a labyrinth-like interlocking smart structure, in the field of additive manufacturing, in particular to a labyrinth-like interlocking smart structure based on 4D printing and its locking method. [Background technology]

[0002] The locking connection device is widely applied in the fields of underwater docking, aerospace, automobile manufacturing, construction engineering and the like. A reliable locking device is an important part to ensure the stable operation of a mechanical system. The locking connection devices commonly used in the field of traditional mechanical engineering usually require complex mechanical structure design, the combination and matching of multiple parts, and the mechanical contributions of man and equipment, such as bolt and nut connection devices, welding devices, riveting devices, etc., which have poor environmental adaptability and cannot achieve smart and controllable locking of the mechanism. Therefore, there is a need for a smart locking device that is programmable, deformation controllable, and interlocking reliable. Summary of the Invention [Problem to be solved by the invention]

[0003] In order to solve the problems in the background art, the present invention provides a labyrinth interlock smart structure and its locking method based on 4D printing. The product of the present invention can respond to external temperature excitation in real time, and form a labyrinth mating interlock to reliably lock the connected object according to the operation execution priority without applying external force. [Means for solving the problem]

[0004] The technical solution of the present invention is as follows: (1) A 4D printed maze-like interlocking smart structure, comprising:

[0005] The structure includes a long non-performing segment, one end of which is fixed to a connector, several locking units, and several short non-performing segments. The locking units and the short non-performing segments are arranged in an alternating order and connected end to end to form a locking segment. The locking segment has a locking unit and a short non-performing segment at both ends. The locking segment is connected to the other end of the long non-performing segment via the locking unit at one end. The locking unit is curved and deformed. The non-performing segments do not deform, and their ends are connected to the ends of the locking units, connecting the locking units together. This forms a smart structure.

[0006] The lock execution unit includes an active layer and a passive layer arranged in a stacked manner. The active layer of each lock execution unit is located on the same side of the labyrinth interlocking smart structure. The active layer is constructed by stacking several printed layers. Each printed layer includes several parallel printed paths, all parallel to the longitudinal direction of the lock segment. The passive layer is constructed by stacking several mesh-like printed layers. Each mesh-like printed layer includes several intersecting printed paths, and the intersecting printed paths form angles of 45° and -45° with respect to the longitudinal direction of the lock segment.

[0007] The thickness ratio k of the active layer to the passive layer of each of the lock execution units is different. The dimensions of the side where the active layer and the passive layer of the lock execution unit are connected are the same. The dimensions of the side where the lock execution unit is connected to the long non-executing segment and the short non-executing segment are the same.

[0008] The long non-executing segment and the short non-executing segment are both constructed by stacking several mesh-like printed layers, each of which has several intersecting printed paths, and the intersecting printed paths form angles of 45° and -45° with respect to the longitudinal direction of the locking segment. The long non-executing segment, the short non-executing segment and each locking unit are all made of shape memory polymer material.

[0009] 1 (2) A locking method for a maze-like interlocking smart structure, the method comprising the steps of: Step 1: Two labyrinth interlocking smart structures are arranged between two spaced apart opposing connectable bodies in a staggered manner in opposite directions with homochirality, with one end of each labyrinth interlocking smart structure as a fixed end being connected to one of the connectable bodies, and the other end as a free end not in contact with the other connectable body. The opposing sides of the locking execution units of the two labyrinth interlocking smart structures are the sides on which the active layers are present. In the initial state, the two labyrinth interlocking smart structures are in a straight line state and arranged parallel to each other with a gap therebetween.

[0010] Step 2: By external stimulation, each locking execution unit of each maze-like interlocking smart structure is deformed to bend toward the other maze-like interlocking smart structure at the same time, and the two maze-like interlocking smart structures are deformed so that the deformation degree from each free end to the fixed end is the same, thereby forming a maze-like interlocking state.

[0011] Step 3: The external stimulus is removed, and the strength of each locking unit is restored to its initial strength, thereby finally locking the two connected bodies together.

[0012] In the step 2, the external stimulus is specifically a temperature stimulus, specifically a temperature of 80 to 90° C., which is higher than the glass transition temperature of the shape memory polymer, 20 to 30° C.

[0013] In step 2, during the deformation of the maze interlocking smart structure, each lock execution unit is curved and deformed according to its respective predetermined operation execution priority, and two adjacent non-executing segments are perpendicular to each other in the maze mating interlocking state.

[0014] The operation execution priority of each locking execution unit from the free end to the fixed end of the maze-like interlocking smart structure is in the order of high to low. The higher the operation execution priority, the smaller the thickness ratio k of the passive layer to the active layer of the locking execution unit, and the shorter the operation execution completion time during bending. The order of operation execution priority is equal to the number of locking execution units of each maze-like interlocking smart structure.

[0015] Specifically, the operation execution priorities are divided into three or five priorities: a first priority G1, a second priority G2, a third priority G3, a fourth priority G4, and a fifth priority G5, which correspond to the thickness ratios k of the passive layer to the active layer of the lock execution unit being 3 to 4, 1.9 to 3, 1.3 to 1.9, 0.8 to 1.3, and 0.5 to 0.8, respectively.

[0016] When the operation execution priority is divided into three priorities, namely, a first priority G1, a second priority G2, and a third priority G3, the maze interlocking interlock state becomes a general lock state. General lock means that the locking state is relatively stable but allows slight loosening. At this time, the two maze interlocking smart structures form a double maze interlocking smart structure. Each maze interlocking smart structure is spirally curved into four segments, and the two maze interlocking smart structures are interlocked with each other.

[0017] When the operation execution priority is divided into five priorities, namely, a first priority G1, a second priority G2, a third priority G3, a fourth priority G4, and a fifth priority G5, the maze interlocking state becomes a strong lock state. Strong lock means that the locking state is very stable and no loosening is allowed. At this time, the two maze interlocking smart structures form a triple maze interlocking smart structure. Each maze interlocking smart structure is spirally curved to have six segments, and the two maze interlocking smart structures are interlocked with each other.

[0018] Note that "double" means that the two interlocking smart structures form two interlocking rings after interlocking, and "triple" means that the two interlocking smart structures form three interlocking rings after interlocking. "Maze-like structure" means that the shape of the smart structure after interlocking resembles a maze. The chirality of the smart structure is determined by the operation execution direction of the lock execution unit of the smart structure, and when the lock execution unit executes the operation clockwise, the smart structure also becomes clockwise.

[0019] In the present invention, according to the locking requirement of the connected object, the maze shape of the smart structure to be fabricated and the number of locking execution units are determined, the operation execution priority of the locking execution unit is set, shape memory polymer is selected as the material, and the smart structure is fabricated by fused deposition 4D printing technology, where the smart structure fabricated by 4D printing is alternately arranged in the opposite direction with the connected object, and the operations with different priorities are executed under external synchronous excitation, and finally a maze-like interlocking interlock is formed. Effect of the Invention

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention has the advantages of simple structure, self-operation, light weight, no pollution, high interlock reliability, etc., and the research and development costs are lower than those of traditional lock connection devices.

[0022] 2. The present invention adopts shape memory polymer as the material, and comprehensively takes into consideration such information as the structural shape of the smart structure, the design parameters of the smart structure, the process parameters of 3D printing, and the excitation temperature of temperature excitation, thereby achieving the rapid manufacturing of complex smart transformation structures, and simplifying the design, manufacturing and assembly processes of smart structure products.

[0023] 3. The present invention uses 4D printing technology to process smart materials, and the smart structure produced is deformed by external synchronous excitation, and finally forms a labyrinth interlocking with a special spatial arrangement. It can respond to thermal excitation in real time and achieve reliable locking of connected objects without applying external force. In addition, the molding process is not limited by the complexity of the structure, making it easier to meet functional requirements compared to traditional manufacturing methods.

[0024] 4. The structure of the present invention is labyrinth-shaped, and when multiple labyrinth-shaped smart structures are interlocked, a reliable locking effect can be achieved. The self-actuating behavior of the smart structure can be controlled by changing the design parameters, and the interlocking process is smooth and reliable. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram of the distribution of the active layer and the passive layer of a lock execution unit according to the present invention. [Diagram 2] FIG. 2 is a schematic diagram of the configuration and design parameters of a smart structure according to the present invention. [Diagram 3] FIG. 3 is a schematic diagram of the operation execution process of a single smart structure according to the present invention, where (a) in FIG. 3 is a schematic diagram of the structure of the smart structure according to the present invention before it executes its operation, (b) in FIG. 3 is a schematic diagram of the structure of the smart structure according to the present invention during its operation, and (c) in FIG. 3 is a schematic diagram of the structure of the smart structure according to the present invention when the operation execution is completed. [Figure 4]FIG. 4 is a schematic diagram of the smart structure fabricated in accordance with the present invention before and after it achieves a double labyrinth-shaped interlocking lock without thermal excitation or application of external force, in which FIG. 4(a) is a schematic diagram of the arrangement state of the smart structure in accordance with the present invention before operation, and FIG. 4(b) is a schematic diagram of the locked state of the smart structure in accordance with the present invention after operation is completed. [Diagram 5] FIG. 5 is a schematic diagram of the smart structure produced in accordance with the present invention before and after it achieves a triple maze-shaped interlocking lock without thermal excitation or application of external force, in which FIG. 5(a) is a schematic diagram of the arrangement state before the smart structure of the present invention is operated, and FIG. 5(b) is a schematic diagram of the locked state after the smart structure of the present invention is operated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The present invention will now be described in more detail with reference to the drawings and specific examples.

[0027] The labyrinth interlocking smart structure based on 4D printing according to the present invention includes a long non-performing segment, one end of which is fixed to a connector, several locking units, and several short non-performing segments, as shown in FIG. 2. Each locking unit and short non-performing segment are arranged in an alternating order and connected end to end to form a locking segment. Both ends of the locking segment are a locking unit and a short non-performing segment, respectively. The locking segment is connected to the other end of the long non-performing segment through the locking unit at one end. The locking unit is curved and deformed. The non-performing segment is not deformed, and the ends are connected to the ends of each locking unit to form a smart structure. The long non-performing segment, the short non-performing segment, and each locking part are all made of shape memory polymer material.

[0028] The lock execution section includes active and passive layers arranged in a stacked manner, as shown in FIG. 1. The active layers of each lock execution section are located on the same side of the labyrinth interlocking smart structure. The active layers are constructed by stacking several printed layers. Each printed layer includes several parallel printed paths, all parallel to the longitudinal direction of the lock segment. The passive layers are constructed by stacking several mesh-like printed layers. Each mesh-like printed layer includes several intersecting printed paths, and the printed paths form angles of 45° and -45° with respect to the longitudinal direction of the lock segment. Both the long non-executing segment and the short non-executing segment are constructed by stacking several mesh-like printed layers. Each mesh-like printed layer includes several intersecting printed paths, and the intersecting printed paths form angles of 45° and -45° with respect to the longitudinal direction of the lock segment.

[0029] Each lock execution unit has a different ratio k of the thickness of the active layer to the passive layer. The dimensions of the side where the active layer and the passive layer of the lock execution unit are connected are the same. The dimensions of the side where the lock execution unit is connected to the long non-executing segment and the short non-executing segment are the same. The locking method of the maze-like interlocking smart structure according to the present invention includes the following steps.

[0030] Step 1: Two labyrinth interlocking smart structures are arranged between two oppositely spaced apart connected bodies in a staggered manner with homochirality in opposite directions, where each labyrinth interlocking smart structure has one end as a fixed end connected to one connected body and the other end as a free end not in contact with the other connected body, the opposite sides of the locking execution units of the two labyrinth interlocking smart structures are the sides where the active layers exist, and in the initial state, the two labyrinth interlocking smart structures are arranged in a straight line and parallel to each other with a space therebetween.

[0031] Step 2: By applying an external stimulus, each locking part of each labyrinth interlocking smart structure is deformed to be curved toward the other labyrinth interlocking smart structure at the same time. The two labyrinth interlocking smart structures are deformed so that the degree of deformation from each free end to the fixed end is the same, thereby forming a labyrinth interlocking state as shown in Figure 3(a), Figure 3(b) and Figure 3(c).

[0032] In step 2, the external stimulus is specifically a temperature stimulus, specifically a temperature of 80 to 90° C., which is higher than the glass transition temperature of the shape memory polymer, 20 to 30° C.

[0033] In step 2, during the deformation of the maze-like interlocking smart structure, each lock-executing unit is curved and deformed according to its respective predetermined operation execution priority, and two adjacent non-executing segments are perpendicular to each other in the maze-like mating interlocking state.

[0034] The operation execution priority of each locking execution unit from the free end to the fixed end of the maze-like interlocking smart structure is in the order of high to low. The higher the operation execution priority, the smaller the thickness ratio k of the passive layer to the active layer of the locking execution unit, and the shorter the operation execution completion time during bending. The order of operation execution priority is equal to the number of locking execution units of each maze-like interlocking smart structure.

[0035] Specifically, the operation execution priority is divided into three or five priorities. The first priority G1, the second priority G2, the third priority G3, the fourth priority G4, and the fifth priority G5 correspond to the thickness ratio k of the passive layer to the active layer of the lock execution unit being 3 to 4, 1.9 to 3, 1.3 to 1.9, 0.8 to 1.3, and 0.5 to 0.8, respectively.

[0036] The action execution priority is determined according to the action execution completion time, where G1 represents 20s to 25s, G2 represents 15s to 20s, G3 represents 10s to 15s, G4 represents 5s to 10s, and G5 represents 0s to 5s.

[0037] When the operation execution priority is divided into three priorities, namely, the first priority G1, the second priority G2, and the third priority G3, the maze interlocking state becomes the general lock state. The general lock means that the locking state is relatively stable but allows a slight loosening. At this time, the two maze interlocking smart structures form a double maze interlocking smart structure. Each maze interlocking smart structure is spirally curved into four segments, and the two maze interlocking smart structures are interlocked with each other.

[0038] When the operation execution priority is divided into five priorities, namely, the first priority G1, the second priority G2, the third priority G3, the fourth priority G4, and the fifth priority G5, the maze interlock state becomes a strong lock state. Strong lock means that the lock state is very stable and no loosening is allowed. At this time, the two maze interlock smart structures form a triple maze interlock smart structure. Each maze interlock smart structure is spirally curved to have six segments, and the two maze interlock smart structures are interlocked with each other.

[0039] Note that double means that both interlocking smart structures form two interlocking rings after interlocking, and triple means that both interlocking smart structures form three interlocking rings after interlocking. Maze-like structure means that the shape of the smart structure after interlocking resembles a maze. The chirality of the smart structure is determined by the operation execution direction of the lock execution unit of the smart structure. When the lock execution unit executes the operation clockwise, the smart structure also becomes clockwise. Step 3: The external stimulus is removed, and the strength of each locking unit is restored to its initial strength, thereby finally locking the two connected bodies together.

[0040] In the present invention, when a labyrinth interlocking smart structure is fabricated, the labyrinth shape of the smart structure to be fabricated and the number of its locking execution units are determined according to the locking requirements of the connected object, and the operation execution priority of the locking execution units is set. According to the design rules of the locking execution units, the design parameter values ​​of the smart structure that satisfy the operation execution priority are determined. Shape memory polymer is selected as the material, the parameter values ​​of the 3D printing process are selected, and an undeformed smart structure is fabricated by 3D printing with fused deposition molding technology. The design parameter values ​​of the smart structure are the width b and thickness h of the smart structure, the thickness ratio k of the passive layer and the active layer of the locking execution unit, the length a1 of the locking execution unit, and the length a2 of the non-executing segment. The parameter values ​​of the 3D printing process include the print line width wp, the height hp of the print layer, the print nozzle temperature tp, and the print speed vp.

[0041] As shown in FIG. 2, the labyrinth interlocking smart structure has a width b of 5mm-100mm, a thickness h of 1mm, a length a1 of the locking execution unit is 8mm-12mm, and a length a2 of the long non-executing segment and the short non-executing segment is 10mm-15mm. The parameter values ​​of the 3D printing process include the print line width wp, the print layer height hp, the print nozzle temperature tp, and the print speed vp. In a specific implementation, the print line width wp of the passive layer of the locking execution unit is 0.4mm, the print layer height hp is 0.1mm, the print nozzle temperature tp is 190-210°C, and the print speed vp is 50-60mm / s. The print line width wp of the active layer of the locking execution unit is 0.4mm, the print layer height hp is 0.05mm, the print nozzle temperature tp is 190-195°C, and the print speed vp is 50-60mm / s. The print line width of the non-execution segment of the lock execution unit is set to wp=0.4 mm, the print layer height hp=0.1 mm, the print nozzle temperature tp=190-210° C., and the print speed vp=50-60 mm / s.

[0042] Fused deposition 3D printing prints passive and active layers in a bottom-up manner, and each printed layer in the passive and active layers is completed by repeating stacking and printing from bottom to top. Fused deposition 3D printing prints non-performing segments in a bottom-up manner, and each printed layer in the non-performing segments is completed by repeating stacking and printing from bottom to top. The passive and active layers of the lock execution unit and each printed layer in the non-performing segments are printed simultaneously when the nozzle is located at the same printing height. The printing order of the same layer is determined by the printing order automatically generated according to the slicing software of the 3D print until the printing of all printed layers is completed. Specific examples of the present invention are as follows. Example 1:

[0043] 1) According to the lock requirement of the connected body being a general lock, the shape of the smart structure to be created is a double maze shape, and the number of lock execution units is determined to be 3. The operation execution priority of each lock execution unit is determined, and they are G1, G3, and G5 from the fixed end to the free end, respectively.

[0044] 2) According to the design rules of the lock execution unit, determine the values ​​of the design parameters of the smart structure that satisfy the operation execution priority. The width b of the smart structure is set to 8 mm, the thickness h is set to 1 mm, and the length a1 of the lock execution unit is set to 10 mm. The lengths of the three non-executing segments from the free end to the fixed end are set to a2 = 12 mm, 12 mm, and 13 mm, respectively. The thickness ratio k of the passive layer to the active layer is set to k = 3 for the lock execution unit with priority G1, k = 1.5 for the lock execution unit with priority G3, and k = 0.6 for the lock execution unit with priority G5.

[0045] 3) Shape memory polymer is selected as the material, and the smart structure is fabricated by fused deposition 3D printing, printing it from bottom to top in a layer-by-layer manner. The angle between the material arrangement direction of the passive layer and the longitudinal direction of the smart structure is 45° and -45°. The material arrangement direction of the active layer is parallel to the longitudinal direction of the smart structure. The material arrangement direction of the non-executing segment of the smart structure perpendicular to the printing plane is consistent with the material arrangement direction of the passive layer. The printing line width of the passive layer of the lock execution unit is wp=0.4mm, the printing layer height hp=0.1mm, the printing nozzle temperature tp=210℃, and the printing speed vp=60mm / s. The printing line width of the active layer of the lock execution unit is wp=0.4mm, the printing layer height hp=0.05mm, the printing nozzle temperature tp=195℃, and the printing speed vp=50mm / s. The print line width of the non-execution segment of the lock execution unit is set to wp=0.4 mm, the print layer height hp=0.1 mm, the print nozzle temperature tp=210° C., and the print speed vp=60 mm / s.

[0046] 4) For the smart structure fabricated by 3D printing, temperature excitation is adopted as the external excitation, and the excitation temperature is 85°C. In the external excitation, the lock execution unit obtains a single maze-like smart structure by completing the curvature operation execution from high to low according to the priority, as shown in Figure 4(b).

[0047] 4(a) and 4(b) are schematic diagrams showing before and after the smart structure achieves double labyrinth interlocking without temperature excitation and external force application. After the lock execution unit starts to perform the bending operation according to the order of operation priority, the free ends are brought into contact to complete the interlocking. Under external synchronous excitation, the smart structure starts to perform the bending operation according to the operation priority of the lock execution unit, and then completes the interlocking to achieve full interlocking interlocking, thereby achieving the purpose of general locking of the connected objects. Example 2:

[0048] 1) In accordance with the lock requirement of the connected body being strong lock, the shape of the smart structure to be created is a triple maze, and the number of lock execution units is determined to be 5. The operation execution priority of each lock execution unit is determined, and they are designated as G1, G2, G3, G4, and G5 from the fixed end to the free end, respectively.

[0049] 2) According to the design rules of the lock execution unit, determine the design parameter values ​​of the smart structure that satisfy the operation execution priority. The width b of the smart structure is 8 mm, the thickness h is 1 mm, and the length a1 of the lock execution unit is 10 mm. The lengths of the three non-executing segments from the free end to the fixed end are a2 = 12 mm, 12 mm, 13 mm, 14 mm, and 15 mm, respectively. The thickness ratio k of the passive layer to the active layer is k = 3 for the lock execution unit with priority G1, k = 2 for the lock execution unit with priority G2, k = 1.5 for the lock execution unit with priority G3, k = 1 for the lock execution unit with priority G4, and k = 0.6 for the lock execution unit with priority G5.

[0050] 3) Select shape memory polymer as material, and use fused deposition 3D printing to print the smart structure from bottom to top in a layer-by-layer manner. The material arrangement direction of the passive layer is perpendicular to the longitudinal direction of the smart structure, the material arrangement direction of the active layer is parallel to the longitudinal direction of the smart structure, and the material arrangement direction of the non-executing segment of the smart structure perpendicular to the printing plane is perpendicular to the longitudinal direction of the smart structure. The printing line width of the passive layer of the lock execution unit is wp=0.4mm, the printing layer height hp=0.1mm, the printing nozzle temperature tp=210℃, and the printing speed vp=60mm / s. The printing line width of the active layer of the lock execution unit is wp=0.4mm, the printing layer height hp=0.05mm, the printing nozzle temperature tp=195℃, and the printing speed vp=50mm / s. The print line width of the non-execution segment of the lock execution unit is set to wp=0.4 mm, the print layer height hp=0.1 mm, the print nozzle temperature tp=210° C., and the print speed vp=60 mm / s.

[0051] 4) For the smart structure fabricated by 3D printing, temperature excitation is adopted as the external excitation, and the excitation temperature is 85°C. In the external excitation, the lock execution unit obtains a single maze-like smart structure by completing the curvature operation execution in sequence from high to low according to the priority.

[0052] 5(a) and 5(b) are schematic diagrams showing before and after the smart structure achieves triple maze interlocking without temperature excitation and external force application. After the lock execution unit starts to perform the bending operation according to the order of operation priority, the free ends are brought into contact to complete the interlocking. With external synchronous excitation, the smart structure starts to perform the bending operation according to the operation priority of the lock execution unit, and then completes the interlocking to achieve full interlocking interlocking, thereby achieving the purpose of tightly locking the connected objects.

[0053] 4D printing combines traditional 3D printing technology with material science, allowing the printed object to spontaneously deform in response to changes in environmental conditions. The present invention applies 3D printing technology and shape memory polymers to a smart lock device, and by changing the design parameters, it generates results with different response speeds according to external stimuli, so that the smart lock device can eliminate the control by external forces during locking, and still achieve orderly and controllable deformation. The programmability of 3D printing technology and the shape memory function of shape memory materials allow the device to achieve controllable spontaneous deformation and locking function, bringing more efficient and smart locking solutions to various fields.

Claims

1. 1. A 4D printed maze-like interlocking smart structure, comprising: A long non-performing segment having one end fixed to a connector, a number of locking units, and a number of short non-performing segments; The lock execution units and the short non-executing segments are arranged in an alternating order and connected end to end to form a lock segment; A lock segment is terminated at each end by a lock execution unit and a short non-executing segment, The lock segment is connected to the other end of the long non-executing segment via a lock execution unit at one end. A labyrinth-like interlocking smart structure based on 4D printing.

2. The lock execution unit includes an active layer and a passive layer arranged in a stack; The active layers of each locking execution unit are located on the same side of the labyrinth-like interlocking smart structure; The active layer is constructed by laminating several printed layers, Each print layer has several parallel print paths, all parallel to the longitudinal direction of the lock segments; The passive layer is constructed by stacking several mesh-like printed layers, each mesh-like printed layer having several intersecting printed paths, the intersecting printed paths being at angles of 45° and −45° with respect to the longitudinal direction of the locking segment; 2. The 4D printed maze interlocking smart structure of claim 1.

3. The lock execution units each have a different thickness ratio k between the active layer and the passive layer; The dimensions of the side where the active layer and the passive layer of the lock execution unit are connected are the same; The dimensions of one side where the lock execution unit is connected to the long non-executing segment and the short non-executing segment are the same.

3. The 4D printed maze interlocking smart structure of claim 2.

4. The long non-executing segment and the short non-executing segment are both constructed by laminating several mesh-shaped print layers, Each mesh-like printed layer has several intersecting print paths, the intersecting print paths being at angles of 45° and −45° with respect to the longitudinal direction of the lock segment; 2. The 4D printed maze interlocking smart structure of claim 1.

5. The long non-executing segment, the short non-executing segment, and each locking unit are all made of shape memory polymer material; 2. The 4D printed maze interlocking smart structure of claim 1.

6. A locking method for the labyrinth interlock smart structure according to any one of claims 1 to 5, comprising the steps of: Two labyrinth interlocking smart structures are arranged alternately in opposite directions with homochirality between two connected bodies that face each other with a gap therebetween, with the proviso that one end of each labyrinth interlocking smart structure as a fixed end is connected to one connected body, and the other end as a free end does not contact the other connected body; The opposing sides of the locking execution units of the two labyrinth interlocking smart structures are the sides on which the active layers exist; Step 1: In an initial state, the two maze interlocking smart structures are aligned and parallel and spaced apart; Step 2: by an external stimulus, each locking execution unit of each maze-like interlocking smart structure is simultaneously deformed to bend toward the other maze-like interlocking smart structure, so that the two maze-like interlocking smart structures are deformed to have the same deformation degree from their free ends to their fixed ends, thereby forming a maze-like interlocking state; and step 3 of removing the external stimulus and restoring the strength of each locking unit to the strength of the initial state, thereby finally locking the two connected bodies. A locking method for a maze-like interlock smart structure.

7. In the step 2, the external stimulus is specifically a temperature stimulus, and the temperature stimulus is specifically 80 to 90°C.

7. The locking method of claim 6, wherein the labyrinth interlocking smart structure is a locking method for a labyrinth interlocking smart structure.

8. In step 2, during the deformation of the maze-like interlocking smart structure, each locking execution unit is curved and deformed according to its respective scheduled operation execution priority, and each two adjacent non-executing segments are perpendicular to each other in a maze-like mating interlocking state; The operation execution priority of each locking execution unit from the free end to the fixed end of the maze-like interlocking smart structure is in the order of high to low, the higher the operation execution priority, the smaller the thickness ratio k of the passive layer to the active layer of the locking execution unit, and the shorter the operation execution completion time during bending, and the rank of the operation execution priority is equal to the number of the locking execution units of each maze-like interlocking smart structure; 7. The locking method of claim 6, wherein the labyrinth interlocking smart structure is a locking method for a labyrinth interlocking smart structure.

9. Specifically, the operation execution priority is divided into three or five priorities, and the first priority G1, the second priority G2, the third priority G3, the fourth priority G4, and the fifth priority G5 correspond to the thickness ratio k of the passive layer to the active layer of the lock execution unit being 3 to 4, 1.9 to 3, 1.3 to 1.9, 0.8 to 1.3, and 0.5 to 0.8, respectively.

9. The locking method of claim 8, wherein the labyrinth interlocking smart structure is a locking method for a labyrinth interlocking smart structure.

10. When the operation execution priority is divided into three priorities, namely, a first priority G1, a second priority G2, and a third priority G3, the maze-like fitting interlock state becomes a general lock state, and at this time, the two maze-like interlock smart structures form a double maze-like interlock smart structure, each maze-like interlock smart structure is spirally curved to have four segments, and the two maze-like interlock smart structures are interlocked with each other; When the operation execution priority is divided into five priorities, including a first priority G1, a second priority G2, a third priority G3, a fourth priority G4, and a fifth priority G5, the maze fitting interlock state is a strong lock state, and at this time, the two maze interlock smart structures form a triple maze interlock smart structure, each maze interlock smart structure is spirally curved into six segments, and the two maze interlock smart structures are interlocked with each other.

10. The locking method of claim 9, wherein the labyrinth interlocking smart structure is a locking method for a labyrinth interlocking smart structure.

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