Calcium phosphorus artificial bone particle bionic concave surface structure shaping machine and shaping method thereof

Abstract

The invention discloses a calcium-phosphorus artificial bone particle bionic concave surface structure molding machine and a molding method thereof. The device part comprises a pressing die blanking mechanism, and a steel ball imprinting module, a special-shaped cutting mechanism, an imprinting cambered surface adjusting mechanism and an imprinting gap adjusting mechanism which are arranged on the pressing die blanking mechanism. The imprinting gap adjusting mechanism obtains bone meal with different curved surface depths by adjusting gaps between imprinting units, so that the bone meal can be used for different medical conditions, and the pressing die blanking mechanism comprises a pressing die box and a wet material pressing die assembly. A steel ball impressing module is arranged in a calcium phosphorus material in a wet material state. Under the driving cooperation of the imprinting cambered surface adjusting mechanism, the steel ball imprinting module forms a plurality of outwards-protruding cambered surface protrusions on the surface of the steel ball imprinting module, calcium phosphorus materials of wet materials are subjected to cambered surface imprinting and molding, then the wet materials are dried or sintered, and therefore artificial bone particles which are similar to natural bone meal and have different degrees of large curvature concave surface shapes are obtained.

Description

Technical Field

[0001] This invention belongs to the field of biomedical material preparation technology, specifically relating to a calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine and its shaping method. Background Technology

[0002] Inorganic calcium-phosphate materials (such as hydroxyapatite and tricalcium phosphate) are widely used in the repair of bone defects in oral and craniofacial surgery due to their excellent biocompatibility and osteoconductive properties. Their repair efficacy largely depends on the macroscopic morphology and specific surface area of ​​their bone particles.

[0003] Currently, commercially available artificial bone particles are mainly prepared by mechanically crushing, cutting, and grinding sintered or dried blocky calcium phosphate materials. The particles obtained from this crushing and grinding process are mostly regular geometric shapes (such as polygonal prisms) with smooth surfaces. This morphology is far removed from the complex, irregular, and highly curved biomimetic structure naturally formed in natural bone powder (such as deproteinized bovine bone). Its biggest drawback is that the smooth surface results in a low specific surface area, limiting the efficiency of fluid infiltration, protein adsorption, and ion exchange, thus affecting the material's bioactivity. Furthermore, the regular shape leads to excessively high particle density after implantation into bone defects, resulting in poor porosity and intercellular connectivity. This severely occupies the space required for bone ingrowth and hinders angiogenesis, ultimately potentially leading to poor repair outcomes.

[0004] Therefore, there is a lack of specialized equipment and methods in the existing technology for the efficient and controllable preparation of calcium-phosphorus artificial bone particles with a biomimetic structure similar to natural bone powder. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a biomimetic concave structure shaping machine and shaping method for calcium phosphate artificial bone particles, in order to solve the technical problems of poor biomimetic surface morphology, low bioactivity, and poor filling performance after implantation of existing calcium phosphate artificial bone particles.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows: In a first aspect, a biomimetic concave structure shaping machine for calcium-phosphorus artificial bone particles is characterized by comprising a die-cutting mechanism, and a steel ball imprinting module, a non-standard cutting mechanism, an imprinting arc surface adjustment mechanism, and an imprinting gap adjustment mechanism disposed on the die-cutting mechanism. The die-cutting mechanism includes a die box and a wet material die assembly; the wet material die assembly is located inside the die box and is used to extrude and shape the calcium phosphate-based paste wet material poured into the die box. The steel ball embossing module includes multiple embossing units; each embossing unit is arranged sequentially in the embossing box, and the gap between them can be adjusted under the drive of the embossing gap adjustment mechanism. Each imprinting unit's imprinting part extends into the extrusion area of ​​the wet material molding assembly. Under the drive of the imprinting arc surface adjustment mechanism, it can form multiple outwardly convex arc surface protrusions to imprint the calcium phosphate-based paste wet material arc surface within the extrusion area of ​​the wet material molding assembly. The irregular cutting mechanism is located at the top of the molding box and is used to cut the calcium phosphate material after plastic hardening.

[0007] Furthermore, the wet material pressing assembly includes a push plate, a pressing plate, and a pressing drive assembly; the push plate and the pressing plate are slidably connected inside the pressing box and can move towards or away from each other under the drive of the pressing drive assembly; the push plate, the pressing plate, and the inner wall of the pressing box enclose a pressing cavity; the steel ball imprinting die extends into the pressing cavity.

[0008] Furthermore, the push template includes fastening strips, transverse splicing strips, longitudinal splicing strips, and multiple independent splicing plates; each longitudinal splicing strip is installed on the edge of each splicing plate along its length; the transverse splicing strips are installed on the edge of each splicing plate along its width; the fastening strips are used to connect and fix the relative positions of two adjacent splicing plates.

[0009] Furthermore, each of the imprinting units includes a steel ball sleeve, a telescopic pressure rod, and multiple steel balls; the telescopic pressure rod is slidably engaged with the steel ball sleeve and can slide under the drive of the imprinting arc surface adjustment mechanism; the outer ring of the telescopic pressure rod is provided with multiple annular grooves; each of the steel balls is disposed in the annular grooves and can extend outward when the telescopic pressure rod slides, forming an outwardly convex arc surface on the surface of the steel ball sleeve.

[0010] Furthermore, the steel ball sleeve has multiple rows of embossing holes that mate with the corresponding steel balls; a telescopic sealing membrane is provided on the outside of the embossing holes; each steel ball is embedded in its corresponding embossing hole and can slide along the axial direction of the embossing hole; the inner side of each steel ball extends into its corresponding annular groove.

[0011] Furthermore, the cross-section of the annular groove is an isosceles trapezoidal structure, divided into a middle storage section and two inclined drive sections; the steel ball is divided into an outer imprinting part and an inner transmission part by the cross-section where the diameter is located; the imprinting part is embedded in the imprinting hole, and the transmission part extends into the annular groove; the steel ball has multiple sizes; the steel balls located in the same annular groove have the same size; the size of the annular groove matches the corresponding steel ball.

[0012] Furthermore, the embossing arc surface adjustment mechanism includes an embossing unit module base and multiple pressure rod pushers; the telescopic pressure rods and pressure rod pushers in each embossing unit are expeditably connected; each pressure rod pusher is sequentially fixed on each embossing unit module base and is connected to the telescopic pressure rod in each embossing unit to drive it to rise or fall.

[0013] The imprint gap adjustment mechanism is located at the bottom of the steel ball imprinting module and is used to adjust the gap between the imprinting units, thereby adjusting the arc surface imprinting depth and obtaining artificial bone particles with different filling densities.

[0014] Furthermore, the imprint gap adjustment mechanism includes a lateral adjustment component and a longitudinal adjustment component. The imprint units can adjust the lateral and longitudinal gaps respectively under the adjustment drive of the lateral adjustment component and the longitudinal adjustment component. The pitch of the threaded segments in the lateral and longitudinal directions increases by an equal multiple. During the adjustment process, each imprint unit retracts the gap by an equal distance.

[0015] Furthermore, the irregular cutting mechanism includes a cutting tool assembly and a dual-axis drive assembly; the cutting tool assembly is mounted on the drive end of the dual-axis drive assembly and can move bidirectionally along the length and width directions of the pressure mold box under the drive of the dual-axis drive assembly to perform cutting operations on the material pushed out by the push platen.

[0016] Secondly, a shaping method for a calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine, the specific steps of which are as follows: Step 1: According to the requirements of the curved cavity of bone powder needed for the current batch, adjust the imprint gap adjustment mechanism. Adjust the gap between each imprint unit by adjusting the longitudinal adjustment component and the transverse adjustment component in the imprint gap adjustment mechanism. Adjust the number of transverse splicing strips and longitudinal splicing strips of the push template to align the holes of the push template and the new imprint unit. Then put the adjusted push template into the mold box. Step 2, initial adjustment: The position of the telescopic pressure rods in each imprinting unit is adjusted by the imprinting arc surface adjustment mechanism, so that the steel ball is in a retracted state; Step 3: Pour the calcium phosphate-based paste wet material into the molding box and place the molding plate into the molding box; the molding plate and the push plate move towards each other under the drive of the molding drive assembly, squeezing the calcium phosphate-based paste wet material in the molding cavity; Step 4: The imprinting arc surface adjustment mechanism pushes the telescopic pressure rods in each imprinting unit to rise; pushes each steel ball located in the annular groove to move outward, forming multiple outwardly convex arc surface protrusions on the outer ring of the steel ball sleeve, imprinting the arc surface of the calcium phosphate-based paste wet material in the mold box; Step 5: The pressure mold drive assembly continuously applies opposing extrusion forces to the pressure plate and the push plate; at the same time, the external dryer is started; after standing for a period of time, once the calcium phosphate-based paste wet material has completely solidified, the pressure rod pusher pulls the telescopic pressure rod to move in the opposite direction to reset, and the steel ball returns to its initial position. Step 6: Remove the pressing template; the pushing template is pushed upward by the pressing mold drive component; the solidified calcium phosphate material is output upward by the pushing template. Step 7: The tool assembly moves freely within the molding box under the drive of the dual-axis drive assembly, and performs cutting operations on the output solidified calcium phosphate material.

[0017] Compared with the prior art, the present invention has the following advantages: 1. This invention involves placing a steel ball imprinting mold inside the wet calcium phosphate material before sintering or drying. Driven by an imprinting arc adjustment mechanism, the steel ball imprinting mold forms multiple convex arc protrusions on its surface, shaping the wet calcium phosphate material. Subsequently, the wet material is dried or sintered, resulting in artificial bone particles with varying degrees of large-curvature concave surface morphology, similar to natural bone powder. This effectively solves the problem that particles obtained from crushing and grinding have overly smooth surfaces, making them unsuitable for medical applications.

[0018] 2. This invention allows for adjustment of the curvature depth of the imprinted bone powder surface by adjusting the imprinting gap between imprinting units, thus adapting to different bone defect repair needs. The prepared bone powder can be classified into three types: Type I (shallow micro-concave), with a surface depth ≤100 µm, offers high mechanical strength and is suitable for bone defect areas subjected to significant mechanical loads, such as large-volume mandibular bone defects and weight-bearing bone reconstruction, providing long-term stable mechanical support for slow-healing large-volume defects; Type II (medium concavity), with a surface depth ≤200 µm (100 µm < 200 µm), optimizes cell migration and adhesion space while ensuring good mechanical strength, suitable for most alveolar ridge preservation or routine bone defects; Type III (deep concavity or connecting hole structure), with a surface depth >200 µm, is suitable for maxillary sinus lift or space maintenance after infection control where high mechanical strength is not required but vascularization is highly demanding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the die blanking mechanism in this invention; Figure 3 This is a schematic diagram of the push template and the imprinting unit in this invention; Figure 4 This is a schematic diagram of the push template structure in this invention; Figure 5 This is a schematic diagram showing the relative positions of the template and the imprinting unit in this invention; Figure 6 This is a schematic diagram showing the position of the embossing unit inside the molding box in this invention; Figure 7 This is a schematic diagram of the imprinting unit in this invention; Figure 8 This is a schematic diagram of the connection structure between the push template and the push shaft in this invention; Figure 9 This is a schematic diagram of the imprinting state of the imprinting unit in this invention; Figure 10 This is a schematic diagram showing the relative positions of the steel ball and the telescopic pressure bar in the contracted state in this invention; Figure 11 This is a schematic diagram showing the relative positions of the steel ball and the telescopic pressure bar under the embossing state in this invention; Figure 12 This is a schematic diagram of the irregular cutting mechanism in this invention; Figure 13 This is a schematic diagram of the irregular tooth structure in the rotating cutting tool of the present invention; Figure 14 This is a schematic diagram of the embossing arc surface adjustment mechanism in this invention; Figure 15 This is a schematic diagram of the material feeding mechanism in this invention; Figure 16 This is a schematic diagram showing the relative positions of the interlocking strip and the longitudinal splicing strip in this invention; Figure 17 This is a schematic diagram of the lateral adjustment component in this invention; Figure 18 This is a schematic diagram of the longitudinal adjustment component in this invention; Figure 19 This is a schematic diagram showing the installation positions of other horizontal components in this invention; Figure 20 This is a schematic diagram showing the positions of two adjacent imprinting units that are far apart in this invention; Figure 21 This is a schematic diagram of the structure of two adjacent imprinting units after two imprinting units that are far apart have finished imprinting in this invention. Figure 22 This is a schematic diagram of the imprinting process where two adjacent imprinting units are close together in this invention. Figure 23 This is a schematic diagram of the structure of two adjacent imprinting units after two closely spaced imprinting units have been imprinted in this invention. Figure 24 This is a schematic diagram of the snap-fit ​​strip in the snap-fit ​​state in this invention; Figure 25 This is a structural diagram showing the spacing between two adjacent splicing panels in this invention; Figure 26 This is a schematic diagram of the fastening strip in this invention; Figure 27 A schematic diagram showing the position of the mortise holes on the fastening strip in this invention; Figure 28 A schematic diagram of the structure of the transverse splicing strip in this invention; Figure 29This is a schematic diagram showing the relative positions of the splicing plate and the longitudinal splicing strip in the snap-fit ​​state in this invention.

[0020] Reference numerals: 1. Steel ball embossing module; 11. Embossing unit; 12. Embossing box; 111. Cover; 112. Steel ball; 113. Telescopic sealing film; 114. Telescopic pressure rod; 115. Embossing hole; 2. Embossing die unloading mechanism; 21. Pressing plate; 22. Pushing plate; 23. Ejection shaft; 24. Transverse splicing strip; 25. Longitudinal splicing strip; 26. Fastening strip; 27. First tenon; 28. Buckle; 29. ​​End block; 210. Second tenon; 211. First mortise; 3. Irregular shape cutting mechanism; 31. Longitudinal drive assembly; 32. Transverse drive assembly; 33. Tool motor; 34. Rotary tool; 35. Irregular shape tooth; 4. Embossing arc surface adjustment mechanism; 41. Longitudinal fixed foot; 42. Pressure rod pusher; 5. Material ejection pusher mechanism; 51. Pusher frame; 52 6. Imprint gap adjustment mechanism; 61. First transverse nut group; 62. Second transverse nut group; 63. Third transverse nut group; 64. Fourth transverse nut group; 65. Transverse motor group; 66. Transverse bearing seat; 67. Transverse limit switch; 68. Transverse moving guide rail; 69. Transverse moving slider; 610. Transverse connecting rotating shaft; 611. Longitudinal moving slider; 612. Longitudinal motor group; 613. First longitudinal nut group; 614. Second longitudinal nut group; 615. Third longitudinal nut group; 616. Longitudinal limit switch; 617. Longitudinal bearing seat; 618. Longitudinal connecting rotating shaft; 619. Longitudinal fixed foot connector; 620. Longitudinal moving guide rail; 621. Imprint unit module base; 622. Other transverse moving mechanisms of the same type. Detailed Implementation

[0021] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] like Figure 1 As shown, a biomimetic concave structure molding machine for calcium-phosphorus artificial bone particles includes a die-cutting mechanism 2, a steel ball imprinting module 1, a non-standard cutting mechanism 3, an imprinting arc surface adjustment mechanism 4, a material discharge and pushing mechanism 5, and an imprinting gap adjustment mechanism 6, all mounted on the die-cutting mechanism 2.

[0024] The die-cutting mechanism 2 includes a die-cutting box 12 and a wet material die-cutting assembly. The die-cutting box 12 is a box structure with an open top and bottom. The wet material die-cutting assembly is disposed inside the die-cutting box 12 and is used to extrude and mold the calcium phosphate-based paste wet material poured into the die-cutting box 12.

[0025] The steel ball embossing module 1 includes multiple embossing units 11. Each embossing unit 11 is arranged in an array within the embossing mold box 12, and the gap between them can be adjusted under the drive of the embossing gap adjustment mechanism 6.

[0026] Each imprinting unit 11 has an imprinting part that extends into the extrusion area of ​​the wet material molding assembly. Under the drive of the imprinting arc surface adjustment mechanism 4, it can imprint various arc surface shapes onto the calcium phosphate-based paste wet material in the extrusion area of ​​the wet material molding assembly.

[0027] The irregular cutting mechanism 3 is located on the top of the molding box 12 and is used to cut the calcium phosphate material after plastic hardening.

[0028] Furthermore, the material discharge and pushing mechanism 5 is located at the top of the compression mold box 12, and is used to push the cut material outward for output.

[0029] like Figure 2 , 3 As shown in Figure 4, the wet material molding assembly includes a push plate 22, a pressing plate 21, and a molding drive assembly. The push plate 22 and the pressing plate 21 are both slidably connected within the molding box 12 and can move towards or in opposite directions under the drive of the molding drive assembly. The push plate 22, the pressing plate 21, and the inner wall of the molding box 12 together form a molding cavity. The push plate 22 has multiple printing through holes that cooperate with each imprinting unit 11. Each imprinting unit 11 passes through its corresponding printing through hole and extends into the molding cavity.

[0030] In actual use, when the pressing template 21 and the pushing template 22 move towards each other under the drive of the pressing mold drive assembly, they squeeze the calcium phosphate-based paste wet material in the pressing mold cavity, so that the calcium phosphate-based paste wet material fills every gap in the pressing mold cavity and applies a certain shaping pressure. Under the drive of the pressing arc surface adjustment mechanism 4, each steel ball pressing mold 1 presses various arc surface shapes on the inner surface of the shaped calcium phosphate-based paste wet material.

[0031] Furthermore, the template 22 includes a panel connecting assembly and multiple independent splicing plates; each impression through hole is respectively opened at the center of each splicing plate. The panel connecting assembly is set at the gap between each splicing plate, and is used to connect two adjacent splicing plates after the gap between each splicing plate has been adjusted.

[0032] like Figure 16As shown, in this embodiment, the panel connection assembly includes a fastening strip 26, multiple transverse splicing strips 24, and multiple longitudinal splicing strips 25. Each longitudinal splicing strip 25 is installed on the edge along the length of each splicing panel. The transverse splicing strips 24 are installed on the edge along the width of each splicing panel. The transverse splicing strips 24 are spliced ​​in a segmented manner, meaning the length of each transverse splicing strip 24 is the same as the width of the corresponding splicing panel. The fastening strip 26 is used to connect and fix the relative positions of adjacent splicing panels.

[0033] like Figure 24-29 As shown, each of the four corners of the splicing panels is provided with a first tenon 27; a second tenon 210 is fixed on both the longitudinal and transverse splicing strips. The interlocking strip is divided into a central main body and end blocks 29 at both ends; the main body has multiple first mortises 211. The end blocks have second mortises; the first mortises 211 are spaced apart and can engage with the second tenons. The second mortises can engage with the first tenons.

[0034] Furthermore, in some embodiments, two locking blocks 28 are symmetrically arranged on both sides of the first tenon 27. The locking blocks are spaced apart from the first tenon and are used to limit the end block portion on the fastening strip.

[0035] When adjusting the gaps between the splicing plates, first loosen the fastening strip 26, and then remove or install the transverse splicing strip 24 and the longitudinal splicing strip 25. By adjusting the gaps between each splicing plate, the spacing between the through holes of each impression mold on the push plate 22 can be reduced or increased. After adjusting the spacing between the through holes of each impression mold, the fastening strip 26 re-fastens and fixes the transverse splicing strip 24 and the longitudinal splicing strip 25 on the adjacent splicing plates, thereby achieving the stability of the overall structure of the push plate 22 and the flexibility of the layout of the imprinting unit 11.

[0036] In this embodiment, the die-driving assembly includes two die-driving cylinders. The telescopic ends of the two die-driving cylinders are arranged facing each other, and are used to apply a pressing force to the die-cutting plate 21 and the push plate 22 in opposite directions. The bottom of the push plate 22 is fixed with multiple push-out shafts 23. The push plate 22 is connected to the corresponding die-driving cylinder via the push-out shafts 23.

[0037] like Figure 7 , 8 As shown in Figure 9, the embossing unit 11 includes a steel ball sleeve, a cap 111, a telescopic pressure rod 114, and multiple steel balls 112. The cap 111 is fixed to the top of the steel ball sleeve to form a seal. The steel ball sleeve has multiple rows of embossing holes 115 that mate with corresponding steel balls. A telescopic sealing membrane 113 is provided on the outer side of each embossing hole 115. Each steel ball is embedded in its corresponding embossing hole 115 and can slide along the axial direction of the embossing hole 115.

[0038] The telescopic pressure rod 114 is slidably connected inside the steel ball sleeve and can rise or fall under the drive of the embossing arc surface adjustment mechanism 4. Multiple annular grooves are arranged sequentially on the outer surface of the telescopic pressure rod 114. The inner side of each steel ball extends into its corresponding annular groove.

[0039] Specifically, such as Figure 10 and 11 As shown, the cross-section of the annular groove is an isosceles trapezoidal structure, divided into a central storage section and two inclined driving sections on both sides. The steel ball is divided into an outer imprinting section and an inner transmission section, with the diameter section as the boundary. The imprinting section is embedded in the imprinting hole 115, and the transmission section extends into the annular groove. Initially, the transmission section of the steel ball abuts against the storage section of the annular groove. When the telescopic pressure rod 114 rises under the drive of the imprinting arc surface adjustment mechanism 4, the transmission section of the steel ball moves outward under the push of the driving section in the annular groove until the imprinting section extends beyond the imprinting hole 115, imprinting the external calcium-phosphorus-based paste wet material onto the arc surface.

[0040] In this embodiment, the telescopic sealing film 113 is made of a flexible material and covers the imprinting hole 115. Initially, the telescopic sealing film 113 is closed, flush with the outer surface of the steel ball sleeve. When the telescopic pressure rod 114 rises under the drive of the imprinting arc adjustment mechanism 4, it pushes the steel balls located in the annular groove outwards, causing the telescopic sealing film 113 to elastically deform. The steel balls then press an arc-shaped imprint into the calcium-phosphorus-based paste wet material. When the telescopic pressure rod 114 descends and resets under the drive of the imprinting arc adjustment mechanism 4, the telescopic sealing film 113 returns to its initial state, and the steel balls reset to their initial positions.

[0041] Furthermore, the telescopic pressure rod 114 is made of magnetic material, which can provide magnetic attraction to the steel ball. When the telescopic pressure rod 114 is reset and lowered under the drive of the embossing arc surface adjustment mechanism 4, the extended steel ball is attracted to the surface of the annular groove by magnetic attraction.

[0042] Furthermore, the magnetic material of the telescopic pressure rod 114 can be set to electromagnetic drive. When the steel ball is pushed out, the power is cut off and no attraction force is generated. When the steel ball needs to be retrieved, the power is turned on and magnetism is generated.

[0043] In this embodiment, the steel balls have multiple sizes. Steel balls located in the same annular groove have the same size. The size of the annular groove matches the corresponding steel ball; that is, the opening size of the annular groove is the same as the diameter of the steel ball. For example, an annular groove with opening d1 can accommodate a steel ball with diameter d1; a groove with opening D2 can accommodate a steel ball with diameter D2.

[0044] In some embodiments, the size of the steel ball in the annular groove of each imprinting unit 11 is set to a random size, thereby increasing the diversity of the imprinting arc surface.

[0045] During processing, the steel balls are initially in a retracted state, the telescopic sealing membrane 113 is closed, and the cylindrical surface of the tube assembly is smooth. In this state, the transmission part of each small steel ball is retracted into the annular groove. After the material is injected and pressurized, the telescopic pressure rod 114 moves upward, and the steel balls move along the inclined surface on the annular groove. The telescopic sealing membrane 113 undergoes elastic deformation under the pressure of the steel balls. The steel balls extend from the imprint hole 115, thereby achieving arc-shaped imprinting of the calcium phosphate-based paste wet material.

[0046] like Figure 9 As shown, the size of each steel ball in the imprinting unit 11 is inconsistent during the imprinting process. The size of the steel balls in different imprinting units 11 and the size of the annular groove on the telescopic pressure rod 114 are all random. Therefore, the shape and size of the imprinted arc surface of the steel balls on the calcium phosphate-based paste wet material are different, thus achieving arc surface differentiation. After imprinting, the telescopic pressure rod 114 moves in the opposite direction to reset, the steel balls return to their initial position, the telescopic sealing film 113 is restored, and the surface of the cylindrical tube assembly returns to a smooth state.

[0047] like Figure 14 As shown, the embossing arc adjustment mechanism 4 includes multiple longitudinal fixed feet 41 and multiple pressure rod pushers 42. Each row of embossing units 11 corresponds to one longitudinal fixed foot 41. Each pressure rod pusher 42 is independent of each other and is fixed sequentially on each longitudinal fixed foot 41. The driving end of each pressure rod pusher 42 is connected to the telescopic pressure rod 114 in each embossing unit 11, for driving it to rise or fall. The bottom of the steel ball sleeve in each embossing unit 11 is fixed to the embossing unit module base 621.

[0048] The bottom of each imprinting unit module base 621 is mounted on the drive end of the imprinting gap adjustment mechanism 6, which can slide laterally or longitudinally under the drive of the imprinting gap adjustment mechanism 6, and adjust the spacing between each imprinting unit during the sliding process.

[0049] In the actual processing, the telescopic pressure rods in each imprinting unit 11 rise under the drive of the pressure rod pusher 42 connected to them. By driving each telescopic pressure rod 114 to rise to different heights through each pressure rod pusher 42, the amount of outward pushing of the steel balls in each imprinting unit is different, thereby forming arc surfaces of different sizes on the calcium phosphate-based paste wet material, further realizing the differentiation of arc surfaces.

[0050] In this embodiment, the pressure rod pusher 42 is an electric push rod. The telescopic end of the electric push rod is fixedly connected to its corresponding telescopic pressure rod 114.

[0051] like Figure 17 , Figure 18As shown, the impression gap adjustment mechanism 6 includes a lateral adjustment component and a longitudinal adjustment component. The longitudinal adjustment component includes a first drive component, a longitudinal moving guide rail 620, and multiple longitudinal fixed feet 41. The longitudinal moving guide rail 620 is fixed to the outer wall of the mold box 12 on one side in the width direction. Multiple longitudinal moving sliders 611 are slidably connected to the longitudinal moving guide rail 620. The end of each longitudinal fixed foot 41 is fixedly connected to the corresponding longitudinal moving slider 611, thereby achieving a sliding fit between the longitudinal fixed foot 41 and the mold box 12.

[0052] The first drive assembly drives each longitudinal fixed foot 41 to slide along the width direction of the molding box 12, and the sliding distances are different for each. Each imprinting unit 11 module base is arranged in an array on each longitudinal fixed foot 41, and its bottom is slidably connected to it. Each longitudinal fixed foot 41 is equipped with a lateral adjustment assembly, which drives each imprinting unit 11 module base 621 on each longitudinal fixed foot 41 to slide along the length direction of the molding box 12, and the sliding distances are different for each, thereby adjusting the gap between each imprinting unit 11 in the length direction. In actual processing, the gap between each imprinting unit 11 in the width direction is adjusted by adjusting the distance between each longitudinal fixed foot 41 through the first drive assembly.

[0053] Specifically, the first drive assembly includes a longitudinal motor assembly 612, a longitudinal connecting rotating shaft 618, a longitudinal bearing housing 617, and multiple longitudinal nut assemblies. The longitudinal bearing housing 617 is fixed to the outer wall of the molding box 12, and the longitudinal connecting rotating shaft 618 is rotatably connected to the longitudinal bearing housing 617. The longitudinal motor assembly 612 is fixed to the molding box 12, and its output shaft is drively connected to one end of the longitudinal connecting rotating shaft 618 to drive its rotation.

[0054] The longitudinal connecting rotating shaft 618 is provided with longitudinal threaded sections corresponding to each longitudinal fixed foot 41, and the pitch of each longitudinal threaded section gradually decreases along the length of the longitudinal connecting rotating shaft 618. Each longitudinal nut group is threadedly connected to its corresponding longitudinal threaded section and fixedly connected to its corresponding longitudinal fixed foot 41. When the longitudinal motor group 612 drives the longitudinal connecting rotating shaft 618 to rotate, each longitudinal nut group generates different axial displacements on its corresponding longitudinal threaded section, thereby causing each longitudinal fixed foot 41 to slide different distances along the longitudinal moving guide rail 620, realizing independent adjustment of the gap of the imprinting unit 11 in the width direction.

[0055] In this embodiment, there are three sets of longitudinal nut groups: a first longitudinal nut group 613, a second longitudinal nut group 614, and a third longitudinal nut group 615. The pitch of the longitudinal thread segment corresponding to the first longitudinal nut group 613 is 3D, the pitch of the longitudinal thread segment corresponding to the second longitudinal nut group 614 is 2D, and the pitch of the longitudinal thread segment corresponding to the third longitudinal nut group 615 is D.

[0056] Furthermore, a longitudinal travel switch 616 is installed on the outer surface of the molding box 12 to limit the sliding travel of the longitudinal fixed foot 41.

[0057] like Figure 19 As shown, the lateral adjustment assembly includes a lateral motor assembly 65, a lateral limit switch 67, a lateral moving guide rail 68, a lateral moving slider 69, a lateral connecting rotating shaft 610, a lateral bearing seat 66, and multiple lateral nut assemblies. The lateral moving guide rail 68 is fixed to the longitudinal fixed foot 41. The multiple lateral moving sliders 69 are slidably connected to the lateral moving guide rail 68 and can slide under the coordinated drive of the lateral motor assembly 65, the lateral connecting rotating shaft 610, and the various lateral nut assemblies. Each imprinting unit 11 module base 621 is fixed to each lateral moving slider 69.

[0058] Specifically, the transverse connecting rotating shaft 610 is arranged along the length of the molding box 12, and its two ends are rotatably connected to the corresponding longitudinal fixed feet 41 through transverse bearing seats 66. The transverse motor assembly 65 is fixed to the corresponding longitudinal fixed feet 41, and its output shaft is drivenly connected to one end of the transverse connecting rotating shaft 610. The transverse connecting rotating shaft 610 is provided with transverse threaded sections corresponding one-to-one with the bases of each imprinting unit 11 module on the same longitudinal fixed feet 41, and the pitch of each transverse threaded section gradually decreases along the length of the longitudinal connecting rotating shaft 618. Each transverse nut assembly is threaded onto the corresponding transverse threaded section and fixedly connected to the corresponding imprinting unit 11 module base 621, and the pressure rod pusher 42 is installed on the imprinting unit 11 module base.

[0059] In this embodiment, there are four transverse nut groups: a first transverse nut group 61, a second transverse nut group 62, a third transverse nut group 63, and a fourth transverse nut group 64. The pitch of the longitudinal thread segment corresponding to the first transverse nut group 61 is 4d, the pitch of the longitudinal thread segment corresponding to the second transverse nut group 62 is 3d, the pitch of the longitudinal thread segment corresponding to the third transverse nut group 63 is 2d, and the pitch of the longitudinal thread segment corresponding to the fourth transverse nut group 64 is d.

[0060] like Figure 20As shown, during actual processing, when the motor in the horizontal motor group 65 starts, the four horizontal nut groups slide under the drive of the horizontal connecting rotating shaft 610, and drive the embossing unit 11 module base 621 to move on the longitudinal fixed foot 41. Since the threads of the four horizontal nut groups differ by a multiple, when the fourth horizontal nut group 64 advances a distance of d, the third horizontal nut group 63 advances a distance of 2d, the second horizontal nut group 62 advances a distance of 3d, and the first horizontal nut group 61 advances a distance of 4d. The relative distance between any two adjacent horizontal nut groups is d. During the movement of the horizontal nut groups, the corresponding embossing unit 11 module base 621 is driven, thereby driving each embossing unit 11 to move synchronously, so that each embossing unit 11 moves closer to each other in the horizontal direction with an equal indentation distance. The lateral travel switch 67 corresponds to the maximum thread travel of the fourth lateral nut group 64. When it reaches this position, it stops running. When the motor in the lateral motor group 65 reverses, each imprinting unit 11 moves away from each other in the lateral direction with an equal indentation distance; the spacing between each imprinting unit 11 in the lateral direction gradually increases.

[0061] The longitudinal adjustment component operates in the same way. The motor in the longitudinal motor group 612 drives the longitudinal connecting rotating shaft 618 to rotate, which in turn drives the three longitudinal nut groups to move with a relative retraction distance D. Each longitudinal nut group reduces the longitudinal interval of the imprinting unit 11 installed on it through the longitudinal fixed foot 41. When the motor in the longitudinal motor group 612 reverses, the interval of the imprinting unit 11 is expanded.

[0062] like Figure 20 As shown in the diagram, the two imprinting units are far apart. To ensure the forming rate of the curved surface after cutting, the minimum depth of the small ball imprinting must be greater than the shortest imprinting area L1. Therefore, the overall material length under this condition is 2*L1+D1, and the longest unimprinted isolation area is D1. The diagram after the imprinting is completed is shown below. Figure 21 As shown, the imprinted material under this working condition, after subsequent cutting, produces a large surface depth of the finished bone powder, suitable for maxillary sinus lift or space maintenance after infection control where mechanical strength requirements are not high but vascularization requirements are extremely high; correspondingly Figure 22 This is a schematic diagram of imprinting with two imprinting units close together. The length of the longest isolation region, D1, remains unchanged. However, due to the shortened interval between the two imprinting units, the length of the shortest imprinting region, L2, will be less than L1. The schematic diagram of the imprinting result is shown below. Figure 23 As shown, the embossed material under this working condition has a smaller surface depth and higher mechanical strength after subsequent cutting, making it suitable for conventional bone defects or bone defect areas subjected to large mechanical loads.

[0063] Furthermore, after each adjustment of the spacing of each imprinting unit, it is necessary to adjust the number of horizontal splicing strips 24 and vertical splicing strips 25 of the push template 22 to achieve hole alignment between the push template 22 and the new imprinting unit arrangement.

[0064] like Figure 12 and 13 As shown, the irregular cutting mechanism 3 includes a cutting tool assembly and a dual-axis drive assembly. The cutting tool assembly is mounted on the drive end of the dual-axis drive assembly and can move bidirectionally along the length and width directions of the pressure mold box 12 under the drive of the dual-axis drive assembly to perform cutting operations on the material pushed out by the push platen 22.

[0065] like Figure 12 As shown, the cutting tool assembly includes a cutting tool motor 33 and a rotary cutting tool 34. The cutting tool motor 33 is fixed on the drive end of the dual-axis drive assembly and can move freely along the length and width directions of the pressure box 12 under the drive of the dual-axis drive assembly. The rotary cutting tool 34 is mounted on the power output shaft of the cutting tool motor 33 and can rotate under the drive of the cutting tool motor 33 to cut the ejected material.

[0066] Furthermore, the outer ring of the rotating cutter 34 has non-standard teeth 35, meaning that each tooth has a different shape, so that when the push plate 22 pushes out the material, the non-standard teeth 35 can cut different surfaces on the material.

[0067] In this embodiment, the dual-axis drive assembly includes a transverse drive assembly 32 and a longitudinal drive assembly 31. The longitudinal drive assembly 31 is mounted on the top of the molding box 12, and its drive end is capable of free movement along the width direction of the molding box 12. The transverse drive assembly 32 is mounted on the drive end of the longitudinal drive assembly 31. The drive end of the transverse drive assembly 32 is capable of free movement along the length direction of the molding box 12.

[0068] Specifically, the longitudinal drive assembly 31 includes a longitudinal drive motor and a first slide rail assembly. The longitudinal drive motor is fixed to one side of the molding box 12 and is used to drive the slider in the first slide rail assembly to move freely along the width direction of the molding box 12.

[0069] The lateral drive assembly 32 includes a lateral drive motor and a second slide rail assembly. The second slide rail assembly is fixed to the slider in the first slide rail assembly. The longitudinal drive motor is fixed to the end of the second slide rail assembly and can drive the slider in the second slide rail assembly to move freely along the length of the molding box 12.

[0070] like Figure 15As shown, the material feeding mechanism 5 includes a feeding cylinder and a feeding frame 51. The feeding frame 51 is slidably connected to the top of the molding box 12 and can slide along one side of the molding box 12 along its length under the drive of the feeding cylinder. A discharge port is provided on the side of the molding box 12. The material fed by the feeding frame 51 is output to the outside from the discharge port.

[0071] In this embodiment, a door 52 is provided on the discharge port. The top edge of the door 52 is rotatably connected to the top edge of the discharge port, and can be flipped upward to open when the pusher frame 51 pushes the material. After the material output is completed, it automatically flips downward to close the discharge port.

[0072] This invention provides a shaping method for a calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine, specifically including the following steps: Step 1: According to the requirements of the curved cavity of bone powder needed for the current batch, adjust the imprint gap adjustment mechanism 6. Adjust the gap between each imprint unit 11 by adjusting the longitudinal adjustment component and the transverse adjustment component in the imprint gap adjustment mechanism 6. Adjust the number of transverse splicing strips 24 and longitudinal splicing strips 25 of the push template 22 to align the holes of the push template 22 and the new imprint unit arrangement. Then put the adjusted push template 22 into the mold box. Step 2, initial adjustment: the position of the telescopic pressure rod 114 in the corresponding imprinting unit 11 is adjusted by the pressure rod pusher 42 in the imprinting arc surface adjustment mechanism 4, so that the steel ball is in a retracted state and the telescopic sealing film 113 is in a closed state. Step 3: Pour the calcium phosphate-based paste wet material into the molding box 12 and support it with the push plate 22 inside the molding box 12. Then, place the pressing plate 21 into the molding box 12. The push plate 22, the pressing plate 21, and the inner wall of the molding box 12 together form a molding cavity. The pressing plate 21 and the push plate 22 move towards each other under the drive of the molding drive assembly, squeezing the calcium phosphate-based paste wet material in the molding cavity, so that the calcium phosphate-based paste wet material fills every gap in the molding cavity and applies a certain shaping pressure.

[0073] Step 4: The telescopic pressure rods 114 in each imprinting unit 11 rise under the action of their corresponding pressure rod pushers. This pushes the steel balls located in the annular groove outward, causing the telescopic sealing film 113 to elastically deform. The rising telescopic pressure rods 114 push the steel balls of different sizes on them outward. Because the sizes of the steel balls are different, the arc shapes of the ejected portions of the steel balls of different sizes are different, thus imprinting concave surfaces of different shapes on the material.

[0074] Step 5: The pressure mold drive assembly continuously applies opposing extrusion forces to the pressure plate 21 and the push plate 22. Simultaneously, the external dryer is activated. After a period of time, once the calcium-phosphorus-based paste wet material has completely cured, the pressure rod pusher 42 pulls the telescopic pressure rod 114 in the opposite direction to reset, and the steel ball returns to its initial position. The telescopic sealing film 113 is restored, and the surface of the cylindrical tube assembly returns to a smooth state.

[0075] Step 6: The mold drive assembly is reset. The mold platen 21 is removed. The mold drive cylinder corresponding to the push platen 22 drives the push platen 22 upward through the push shaft 23. The diameter of each through hole on the push platen 22 is consistent with the diameter of the steel ball sleeve in each impression unit 11, so that the dried material in the gap can be smoothly peeled out.

[0076] Step 7: Start the tool motor 33, and the rotating tool 34 will rotate under the drive of the tool motor 33. At the same time, it will move freely along the length and width directions of the pressure mold box 12 under the drive of the dual-axis drive assembly.

[0077] During the movement of the rotating cutter 34, the material is pushed upward synchronously and cut by the rotating teeth 35, thereby achieving a cutting arc surface with different shapes on the cross-section of the material.

[0078] Step 8: After cutting is completed, the pusher 51 slides along one side of the length direction of the compression mold box 12 under the drive of the pusher cylinder, and outputs the cut material to the outside through the discharge port.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biomimetic concave structure shaping machine for calcium-phosphorus artificial bone particles, characterized in that: It includes a die blanking mechanism, as well as a steel ball embossing module, a non-standard cutting mechanism, an embossing arc surface adjustment mechanism, and an embossing gap adjustment mechanism, all mounted on the die blanking mechanism. The die-cutting mechanism includes a die box and a wet material die assembly; the wet material die assembly is located inside the die box and is used to extrude and shape the calcium phosphate-based paste wet material poured into the die box. The steel ball embossing module includes multiple embossing units; each embossing unit is arranged sequentially in the embossing box, and the gap between them can be adjusted under the drive of the embossing gap adjustment mechanism; Each imprinting unit's imprinting part extends into the extrusion area of ​​the wet material molding assembly. Under the drive of the imprinting arc surface adjustment mechanism, it can form multiple outwardly convex arc surface protrusions to imprint the calcium phosphate-based paste wet material arc surface within the extrusion area of ​​the wet material molding assembly. The irregular cutting mechanism is located at the top of the molding box and is used to cut the calcium phosphate material after plastic hardening.

2. The imprint gap adjustment mechanism is located at the bottom of the steel ball imprint module and is used to adjust the gap between the imprint units, thereby adjusting the arc surface imprint depth and obtaining artificial bone particles with different filling densities.

3. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 1, characterized in that: The wet material pressing assembly includes a push plate, a pressing plate, and a pressing drive assembly; the push plate and the pressing plate are slidably connected inside the pressing box and can move towards or away from each other under the drive of the pressing drive assembly; the push plate, the pressing plate, and the inner wall of the pressing box enclose a pressing cavity; the steel ball imprinting die extends into the pressing cavity.

4. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 2, characterized in that: The push template includes fastening strips, transverse splicing strips, longitudinal splicing strips, and multiple independent splicing plates; each longitudinal splicing strip is installed on the edge of each splicing plate along its length; the transverse splicing strips are installed on the edge of each splicing plate along its width; the fastening strips are used to connect and fix the relative positions of two adjacent splicing plates.

5. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 1, characterized in that: Each of the imprinting units includes a steel ball sleeve, a telescopic pressure rod, and multiple steel balls; the telescopic pressure rod is slidably engaged with the steel ball sleeve and can slide under the drive of the imprinting arc surface adjustment mechanism; the outer ring of the telescopic pressure rod is provided with multiple annular grooves; each of the steel balls is disposed in the annular grooves and can extend outward when the telescopic pressure rod slides, forming an outwardly convex arc surface on the surface of the steel ball sleeve.

6. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 4, characterized in that: The steel ball sleeve has multiple rows of imprinting holes that mate with the corresponding steel balls; a telescopic sealing membrane is provided on the outside of the imprinting holes; each steel ball is embedded in its corresponding imprinting hole and can slide along the axial direction of the imprinting hole; the inner side of each steel ball extends into its corresponding annular groove.

7. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 4, characterized in that: The annular groove has an isosceles trapezoidal cross-section, divided into a central storage section and two inclined drive sections. The steel ball is divided into an outer imprinting section and an inner transmission section, with the diameter section as the boundary. The imprinting section is embedded in the imprinting hole, and the transmission section extends into the annular groove. The steel ball has multiple sizes. The steel balls located in the same annular groove have the same size. The size of the annular groove matches the size of its corresponding steel ball.

8. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 4, characterized in that: The embossing arc adjustment mechanism includes an embossing unit module base and multiple pressure rod pushers; the telescopic pressure rods and pressure rod pushers in each embossing unit are movably connected; each pressure rod pusher is sequentially fixed on the base of each embossing unit module and is connected to the telescopic pressure rod in each embossing unit to drive it to rise or fall.

9. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 1, characterized in that: The embossing gap adjustment mechanism includes a lateral adjustment component and a longitudinal adjustment component. The embossing unit can adjust the lateral and longitudinal gaps respectively under the adjustment drive of the lateral and longitudinal adjustment components. The pitch of the threaded segments in the lateral and longitudinal directions increases by an equal multiple. During the adjustment process, each embossing unit shrinks into an equal distance gap.

10. The calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 1, characterized in that: The irregular cutting mechanism includes a cutting tool assembly and a dual-axis drive assembly; the cutting tool assembly is mounted on the drive end of the dual-axis drive assembly and can move bidirectionally along the length and width directions of the pressure mold box under the drive of the dual-axis drive assembly to cut the material pushed out by the push platen.

11. The shaping method of a calcium-phosphorus artificial bone particle biomimetic concave structure shaping machine according to claim 8, characterized in that: The specific steps are as follows: Step 1: According to the requirements of the curved cavity of bone powder needed for the current batch, adjust the imprint gap adjustment mechanism. Adjust the gap between each imprint unit by adjusting the longitudinal adjustment component and the transverse adjustment component in the imprint gap adjustment mechanism. Adjust the number of transverse splicing strips and longitudinal splicing strips of the push template to align the holes of the push template and the new imprint unit. Then put the adjusted push template into the mold box. Step 2, initial adjustment: The position of the telescopic pressure rods in each imprinting unit is adjusted by the imprinting arc surface adjustment mechanism, so that the steel ball is in a retracted state; Step 3: Pour the calcium phosphate-based paste wet material into the molding box and place the molding plate into the molding box; the molding plate and the push plate move towards each other under the drive of the molding drive assembly, squeezing the calcium phosphate-based paste wet material in the molding cavity; Step 4: The imprinting arc surface adjustment mechanism pushes the telescopic pressure rods in each imprinting unit to rise; pushes each steel ball located in the annular groove to move outward, forming multiple outwardly convex arc surface protrusions on the outer ring of the steel ball sleeve, imprinting the arc surface of the calcium phosphate-based paste wet material in the mold box; Step 5: The pressure mold drive assembly continuously applies opposing extrusion forces to the pressure plate and the push plate; at the same time, the external dryer is started; after standing for a period of time, once the calcium phosphate-based paste wet material has completely solidified, the pressure rod pusher pulls the telescopic pressure rod to move in the opposite direction to reset, and the steel ball returns to its initial position. Step 6: Remove the pressing template; the pushing template is pushed upward by the pressing mold drive component; the solidified calcium phosphate material is output upward by the pushing template. Step 7: The tool assembly moves freely within the molding box under the drive of the dual-axis drive assembly, and performs cutting operations on the output solidified calcium phosphate material.

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