CN112284973B - Device and method for measuring consistency of medical ceramic slurry for extrusion type 3D printing - Google Patents
Device and method for measuring consistency of medical ceramic slurry for extrusion type 3D printing Download PDFInfo
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Abstract
The invention provides a device and a method for measuring the consistency of medical ceramic slurry for 3D extrusion printing, wherein the device comprises a connecting bracket, a volumetric flask and a cylinder body; the top of the cylinder body is fixedly connected to the connecting bracket; a cylindrical body is coaxially arranged in the cylinder body, the bottom of the cylindrical body is connected with a solid needle head, the solid needle head extends out of the bottom of the cylinder body, and the cylindrical body can move up and down in the cylinder body; the cylinder body is provided with scale marks reflecting the height of the position; when the medical ceramic slurry container is used, the volumetric flask is positioned below the cylinder body, medical ceramic slurry is filled in the volumetric flask, the longitudinal position of the columnar body is firstly adjusted, the end part of the solid needle head is flush with the surface of the medical ceramic slurry, the position height of the columnar body is read, then the columnar body freely falls for set time, the position height of the columnar body is read, and the consistency of the medical ceramic slurry is reflected by the size of the penetration value. The consistency of the medical ceramic slurry suitable for 3D extrusion printing and forming can be effectively estimated, so that the waste of raw materials and working hours is reduced, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a device and a method for measuring the consistency of medical ceramic slurry for extrusion type 3D printing.
Background
The biological ceramic material is a material used for specific biological or physiological functions, can be directly used for human bodies or biological, medical and biochemical ceramic materials directly related to the human bodies, and is more and more favored by students due to no toxic or side effect, good degradation performance and good biocompatibility with biological tissues. Such as: beta-tricalcium phosphate, alpha-tricalcium phosphate, tricalcium polyphosphate, hydroxyapatite, and the like.
The ideal artificial bone implant formed by 3D printing of the medical ceramic material can be printed into an individualized product according to customized requirements, has a reasonable internal porous structure and an external shape, and also has certain bionic mechanical properties. The biological scaffold prepared by the extrusion type 3D printing technology has good biocompatibility, and the size and the shape of the pores of the scaffold are more in line with the migration, proliferation and differentiation of planted cells, so that an excellent environment can be provided for repairing tissue defects.
The medical calcium phosphate ceramic material is used for clinical tests of bone substitutes for ear and ossicular defects, fillers for middle-section and calcaneus bone defects of four limbs, fillers for high-position tibia bone defects and the like by students at present, and the medical calcium phosphate ceramic material has beneficial effects. The consistency of the medical ceramic slurry plays a decisive role in the forming effect of the extrusion printing technology: when the consistency of the slurry is too large, the slurry cannot be extruded; when the consistency of the slurry is too low, the product will collapse during the forming process, and the design requirements of the product size cannot be met. Therefore, for the extruded 3D printing formed bone scaffold material, it is very necessary to explore its proper consistency. However, the high-consistency pasty ceramic slurry in the market is mostly measured by adopting an advanced rotary rheometer, and the high-consistency pasty ceramic slurry is expensive, usually 30-50 ten thousand yuan, and cannot be released for small and micro enterprises. Most enterprises formulate the pulp with certain consistency according to experience, and determine the proper consistency of the pulp through trial printing. Therefore, raw material waste is caused, and the working hour investment is increased. Therefore, it is necessary to design and invent a consistency testing method and device which can not only effectively measure the consistency of medical ceramic slurry, but also save raw materials and labor time and investment cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method for measuring the consistency of the medical ceramic slurry for the extrusion type 3D printing, which can effectively estimate the consistency of the medical ceramic slurry suitable for the extrusion type 3D printing and forming, thereby reducing the waste of raw materials and working hours and having low cost.
The invention is realized by the following technical scheme:
the measuring device for the consistency of the medical ceramic slurry for the extrusion type 3D printing comprises a connecting support, a volumetric flask and a cylinder body;
the top of the cylinder body is fixedly connected to the connecting bracket; a cylindrical body is coaxially arranged in the cylinder body, the bottom of the cylindrical body is connected with a solid needle head, the solid needle head extends out of the bottom of the cylinder body, and the cylindrical body can move up and down in the cylinder body; the cylinder body is provided with scale marks reflecting the height of the position;
when the medical ceramic slurry bottle is used, the volumetric flask is positioned below the cylinder body, medical ceramic slurry is filled in the volumetric flask, the longitudinal position of the columnar body is firstly adjusted, the end part of the solid needle head is flush with the surface of the medical ceramic slurry, the position height of the columnar body is read, and then the columnar body freely falls for set time and then the position height of the columnar body is read.
Preferably, the barrel is provided with two strip-shaped through holes along the axial direction, the two strip-shaped through holes are arranged oppositely, and the edges of the strip-shaped through holes are provided with scale marks; two lugs are arranged on the outer surface of the upper end of the cylindrical body, the two lugs are oppositely arranged, and each lug extends out of the corresponding elongated through hole on the cylinder body.
Preferably, the device also comprises a columnar body fixing structure; when the medical ceramic slurry needle is used, the longitudinal position of the cylindrical body is firstly adjusted by the cylindrical body fixing structure, and the cylindrical body is fixed, so that the needle point of the solid needle is flush with the surface of the medical ceramic slurry; the cylindrical body fixing structure then releases the cylindrical body, allowing the cylindrical body to fall freely.
Preferably, the columnar body fixing structure comprises a magnet and a metal strip, the cylinder body is made of stainless steel, the magnet is adsorbed on the outer surface of the cylinder body, and two fixing rings are respectively arranged on two sides of the magnet; when the columnar body needs to be fixed, one end of the metal strip penetrates through one fixing ring and extends to one long-strip-shaped through hole of the cylinder body, the other end of the metal strip penetrates through the other fixing ring and extends to the other long-strip-shaped through hole of the cylinder body, and the lug on the columnar body is hung on the metal strip; when the cylindrical body is required to fall freely, the metal strip is pulled outwards, and two ends of the metal strip leave the strip-shaped through hole of the cylinder body.
Preferably, the solid needle is threadedly connected to the bottom of the cylindrical body.
Preferably, the cylindrical body is a plastic cylinder.
Preferably, the device further comprises an object stage, wherein the connecting bracket is fixed on the object stage, and the volumetric flask is arranged on the object stage when the device is used.
Preferably, the multifunctional scraper also comprises a scraper and a stopwatch; when the medical ceramic slurry scraper is used, the scraper is used for scraping the surface of the medical ceramic slurry in the volumetric flask, and the stopwatch is used for timing when the cylindrical body falls freely.
The measuring method for the consistency of the extrusion type 3D printing medical ceramic slurry is utilized, and comprises the following steps:
step 1: filling the medical ceramic slurry into a volumetric flask;
and 2, step: adjusting the longitudinal position of the cylindrical body to make the end of the solid needle flush with the surface of the medical ceramic slurry, and reading the corresponding scale value of the cylindrical body to be h 1 ；
And step 3: the column body is allowed to freely fall for a set time, and the corresponding scale value of the column body at the moment is read as h 2 H is to be 2 And h 1 The difference value is recorded as the penetration value of the medical ceramic slurry, and the consistency of the medical ceramic slurry is reflected by the penetration value.
Preferably, the method further comprises the following steps:
and 4, step 4: and (3) repeating the steps 2 and 3, measuring to obtain penetration values of a plurality of different position points on the surface of the medical ceramic slurry, calculating a mean value H of the penetration of the plurality of different position points, and reflecting the consistency of the medical ceramic slurry by using the size of the mean value H of the penetration.
Compared with the prior art, the invention has the following beneficial technical effects:
when the measuring device is used, the medical ceramic slurry is filled into a volumetric flask; adjusting the longitudinal position of the column body to make the end of the solid needle flush with the surface of the medical ceramic slurry, and reading the scale value corresponding to the column body at the moment to be h 1 (ii) a Then the column body is allowed to fall freely, the time is set, and the corresponding scale value of the column body at the moment is read as h 2 H is to be 2 And h 1 The difference of (a) was recorded as the penetration value of the medical ceramic slurry. The higher the consistency of the medical ceramic slurry is, the lower the free falling speed of the columnar body is, and the smaller the penetration value is; on the contrary, the lower the consistency of the medical ceramic slurry is, the higher the free falling speed of the columnar body is, and the larger the penetration value is; therefore, the size of the penetration value can reflect the consistency of the medical ceramic slurry. The consistency of medical ceramic slurry can be effectively estimated by the device of the invention.
Furthermore, the lugs extend out of the strip-shaped through holes, and the scale marks are arranged on the edges of the strip-shaped through holes, so that the positions of the columnar bodies can be adjusted through the lugs, and the scales corresponding to the lugs can reflect the positions of the columnar bodies, and the observation and reading of data are facilitated.
Furthermore, the magnet is adsorbed on the cylinder body, the up-and-down sliding is very convenient, and the position of the columnar body is adjusted through the magnet, so that the operation is convenient and fast.
The measuring method of the invention can measure the penetration value of the medical ceramic slurry, and the size of the penetration value can reflect the consistency of the medical ceramic slurry. When judging whether the consistency is suitable for extrusion type 3D printing forming, measuring penetration values of a series of medical ceramic slurry with different consistencies in advance, then obtaining a penetration value range meeting printing forming requirements through printing, subsequently, when preparing the medical ceramic slurry, only measuring the penetration value, judging whether the penetration value is in the penetration value range meeting the printing forming requirements, if so, printing a smooth and continuous straight line, and if not, adjusting according to the size condition; for example, if the penetration value is larger than the maximum value of the penetration value range meeting the printing and forming requirements, the medical ceramic slurry is too low in consistency, and ceramic powder needs to be added; if the penetration value is less than the minimum value of the penetration value range meeting the printing and forming requirements, the medical ceramic slurry is too thick, and a solution needs to be added. The method can effectively estimate the consistency of the medical ceramic slurry suitable for extrusion type 3D printing and forming, compared with the existing method, the method is simple and convenient to operate, simple in design, low in price and suitable for wide market popularization, and waste of raw materials and labor in the experiment exploration process can be reduced.
Furthermore, the accuracy of the measurement result is ensured by measuring and averaging different position points.
Drawings
Fig. 1 is a structural diagram of a device for testing the consistency of medical ceramic slurry by extrusion 3D printing according to the present invention.
Fig. 2 is a structural view of a doctor blade according to an embodiment of the present invention.
FIG. 3 is a block diagram of a threaded cylinder with dual lugs according to an embodiment of the present invention.
Fig. 4 is a structural view of a fixing structure of a magnet columnar body according to an embodiment of the present invention.
FIG. 5 is a drawing of a ceramic slurry according to example 1 of the present invention.
FIG. 6 is a diagram of a printed sample according to example 2 of the present invention.
FIG. 7 is a diagram of a sample printed in example 3 of the present invention.
FIG. 8 is a diagram of a printed sample according to example 4 of the present invention.
FIG. 9 is a diagram of a printed sample according to example 5 of the present invention.
In the figure: objective table 1, linking bridge 2, screw 3 of screwing, volumetric flask 4, barrel 5, metal strip 6, retainer plate 8, magnet 9, the columnar body 10, entity syringe needle 11, lug 12, scraper 13.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in figure 1, the device for measuring the consistency of medical ceramic slurry through extrusion type 3D printing comprises an object stage 1, wherein a connecting support 2, a volumetric flask 4 and a cylinder body 5 are arranged on the object stage 1.
The top of the cylinder 5 is fixed on the connecting bracket 2. A cylindrical body 10 is coaxially arranged in the cylinder body 5, the bottom of the cylindrical body 10 is connected with a solid needle 11, the solid needle 11 extends out of the bottom of the cylinder body 5, and the cylindrical body 10 can move up and down in the cylinder body 5.
Two strip-shaped through holes 7 are axially formed in the barrel 5, the two strip-shaped through holes 7 are oppositely arranged, and scale marks are arranged on the edges of the strip-shaped through holes 7. As shown in fig. 3, two lugs 12 are provided on the outer surface of the upper end of the cylindrical body 10, the two lugs 12 being disposed opposite each other, each lug 12 protruding from a corresponding elongate through hole 7 of the cylindrical body 5.
And a cylinder fixing structure for fixing the cylinder 10 at a desired height.
As shown in fig. 1 and 4, the cylindrical body fixing structure of the present embodiment includes a magnet 9 and a metal strip 6, the cylindrical body 5 is made of stainless steel (martensite), the magnet 9 is adsorbed on the outer surface of the cylindrical body 5, and a fixing ring 8 is disposed on each of two sides of the magnet 9. When the cylindrical body 10 needs to be fixed, one end of the metal strip 6 penetrates through one fixing ring 8 and extends to one long-strip-shaped through hole 7 of the cylinder body 5, and the other end of the metal strip 6 penetrates through the other fixing ring 8 and extends to the other long-strip-shaped through hole 7 of the cylinder body 5; lugs 12 on the cylindrical body 10 are hung on the metal strip 6; when the cylindrical body 10 is not required to be fixed, the metal strip 6 is pulled outward, so that both ends of the metal strip 6 are separated from the elongated through holes 7 of the cylinder 5. The fixing ring 8 is arranged in an arch shape.
The solid needle 11 is a knob type needle and is in threaded connection with the bottom of the cylindrical body 10.
In the present embodiment, the stage 1 is square and has a size of 150 × 150mm. The connecting support 2 comprises a vertical rod and a transverse rod, the bottom of the vertical rod is fixed on the objective table 1, and the transverse rod is fixed on the vertical rod through a screwing screw 3.
In the embodiment of the invention, the volumetric flask 4 is a metallic volumetric flask with an upper elongated through hole 7 and a lower bottom cover, the bottom of the volumetric flask 4 is 3mm thick, the upper inner diameter is 38mm, the outer diameter is 42mm, the wall thickness is 3mm, the height is 30mm, and the volume is 24.5ml.
In the embodiment of the invention, the cylinder body 5 is a hollow thin-walled cylinder made of stainless steel (martensite), the diameter is 25mm, the height is 85mm, the wall thickness is 1mm, the top of the cylinder body 5 is closed, a fixed support is welded on the top of the cylinder body, and the cylinder body is fixed on a cross bar of the connecting support 2 through the fixed support. The width of the strip-shaped through hole 7 is 5mm, and the scale measuring range is 50mm.
In the embodiment of the present invention, the metal strip 6 is an aluminum alloy sheet having a certain hardness and a curvature.
In the embodiment of the invention, the magnet 9 is a columnar solid magnet with the diameter of 8mm and the height of 10mm. The cylindrical body 10 is a plastic syringe, the upper end of the cylindrical body is sealed to form a hollow cylinder, the lower end of the cylindrical body is spiral, a knob type needle head is matched, and the diameter of the plastic syringe is 9mm, and the length of the plastic syringe is 20mm. The solid needle 11 is a knob type needle, the diameter of the needle is 1mm, and the length of the needle is 30mm. The total mass of the plastic barrel and the solid needle 11 is 6g.
The device is also equipped with a 60-degree scraper 13 and a stopwatch. The doctor blade 13 is shown in figure 2.
The consistency of the prepared pulp is represented by the following steps using the above measuring device:
step 1: firstly, the stirred medical ceramic slurry is filled into a volumetric flask 4 for three times, and the medical ceramic slurry is vibrated for a plurality of times by hands every 1/3 of the medical ceramic slurry filled in the volumetric flask so as to level the surface of the medical ceramic slurry.
Step 2: and after the third charging, leveling one surface of the scraper 13 with the angle on the surface of the slurry to scrape the surface of the medical ceramic slurry. Hanging the lug 12 on the columnar body 10 on the metal strip, adjusting the height of the magnet 9 to make the end of the solid needle 11 flush with the surface of the medical ceramic slurry, and reading the scale value h corresponding to the lug 12 at the moment 1 。
And step 3: pulling the metal strip, leaving the two ends of the metal strip from the strip-shaped through holes 7 of the cylinder 5, simultaneously pressing the stopwatch to enable the cylindrical body with the solid needle head to fall freely, and reading the scale value h corresponding to the lug 12 between 5 and 8 seconds 2 H is to be 2 And h 1 The difference of (A) is recorded as the penetration value H of the medical ceramic slurry x 。
And 4, step 4: selecting 5 different positions on the surface of the medical ceramic slurry according to the test method in the steps 2 and 3 to obtain penetration values H 1 、H 2 、H 3 、H 4 、H 5 And calculating the average value H of the penetration degrees of the 5 position points, wherein when the average value H satisfies that H is more than 3 and less than or equal to 6, the consistency of the medical ceramic slurry is the optimal consistency of the extrusion type 3D printing slurry.
Example 1
The testing method for the consistency of the extruded 3D printing medical ceramic slurry comprises the following steps:
the preparation method comprises the steps of selecting medical ceramic powder material beta tricalcium phosphate (beta-TCP) and Hydroxyapatite (HA), taking a polyvinyl alcohol (PVA) aqueous solution as a binder, and uniformly stirring a proper amount of ceramic powder material (HA: beta-TCP = 3) and a PVA aqueous solution with the concentration of 12% by using a homogenizer ZYMC-580V, wherein the mass ratio of the ceramic powder material to the PVA is 9.
And 2, after the third charging is finished, inclining one side of the scraper with the angle to enable the scraper to be flush with the surface of the ceramic slurry, and scraping the surface of the ceramic slurry. Adjusting the upper and lower positions of the magnet to make the solid needle flush with the surface of the ceramic slurry, and reading the scale value corresponding to the lug 12 to be h 1 。
Selecting 5 points according to the test method in the operation steps 1, 2 and 3 to obtain penetration value H 1 、H 2 、H 3 、H 4 、H 5 In which H is 1 ＝2mm、H 2 ＝1mm、H 3 ＝2mm、H 4 ＝2mm、H 5 =2mm. Then the mean of 5 points is:
when the ceramic paste with the penetration value of 1.8mm is used as the extrusion type 3D printing paste, the printing result shows that the paste with the consistency can not be extruded under the same air pressure extrusion condition, and the detailed view is shown in FIG. 5.
Example 2
A method for testing the consistency of extruded 3D printed ceramic slurry, comprising the steps of:
the preparation method comprises the following steps of selecting medical ceramic powder beta-TCP, HA and PVA aqueous solution as binders, and uniformly stirring a proper amount of ceramic powder (HA: beta-TCP = 3) and PVA aqueous solution with the concentration of 12% by using a homogenizer, wherein the mass ratio of the ceramic powder to the PVA is 8.
Selecting 5 points according to the test method in the operation steps 1, 2 and 3 to obtain penetration value H 1 、H 2 、H 3 、H 4 、H 5 In which H is 1 ＝2mm、H 2 ＝3mm、H 3 ＝4mm、H 4 ＝3mm、H 5 =3mm. Then the mean of 5 points is:
when the ceramic paste with the penetration value of 3mm is used as the extrusion type 3D printing paste, the printing result shows that the paste with the consistency can print smooth lines under the same air pressure extrusion condition, but the line breakage phenomenon happens sometimes in the printing process, and the detailed description is shown in FIG. 6.
The testing method for the consistency of the extruded 3D printing medical ceramic slurry comprises the following steps:
the preparation method comprises the steps of selecting medical ceramic powder beta-TCP, HA and PVA aqueous solution as binders, and uniformly stirring a proper amount of ceramic powder (HA: beta-TCP = 3) and 12% PVA aqueous solution by using a homogenizer, wherein the mass ratio of the ceramic powder to the PVA is 7.
And 2, after the third charging is finished, inclining one surface of the scraper with the angle to enable the scraper to be flush with the surface of the ceramic slurry, and scraping the surface of the ceramic slurry. The upper and lower positions of the magnet are adjusted to ensure that the solid needle is flat with the surface of the ceramic slurryThe scale value corresponding to the lug 12 at the moment of the simultaneous reading is h 1 。
Selecting 5 points according to the test method in the operation steps 1, 2 and 3 to obtain penetration value H 1 、H 2 、H 3 、H 4 、H 5 In which H is 1 ＝5mm、H 2 ＝4mm、H 3 ＝5mm、H 4 ＝5mm、H 5 =6mm. Then the mean of 5 points is:
the ceramic slurry with the penetration value of 5mm is used as the slurry of the extrusion type 3D printer, and the printing result shows that the slurry with the consistency can print continuous and smooth lines under the same air pressure extrusion condition, and the forming performance is better, and is shown in figure 7 in detail.
Example 4
The testing method for the consistency of the extruded 3D printing medical ceramic slurry comprises the following steps:
the preparation method comprises the following steps of selecting medical ceramic powder beta-TCP and HA and PVA aqueous solution as binders, and uniformly stirring a proper amount of ceramic powder (HA: beta-TCP = 3) and PVA aqueous solution with the concentration of 12% by using a homogenizer, wherein the mass ratio of the ceramic powder to the PVA is 6.
And 2, after the third charging is finished, inclining one surface of the scraper with the angle to enable the scraper to be flush with the surface of the ceramic slurry, and scraping the surface of the ceramic slurry. Adjusting the upper and lower positions of the magnet to make the solid needle flush with the surface of the ceramic slurry, and reading the scale value corresponding to the lug 12 to be h 1 。
Selecting 5 points according to the test method in the operation steps 1, 2 and 3 to obtain a penetration value H 1 、H 2 、H 3 、H 4 、H 5 In which H 1 ＝6mm、H 2 ＝6mm、H 3 ＝6mm、H 4 ＝6mm、H 5 =7mm. Then the mean of the 5 points is:
the ceramic slurry with the penetration value of 6.2mm is used as the slurry of the extrusion type 3D printer, and the printing result shows that the slurry with the consistency can print continuous and smooth lines under the same air pressure extrusion condition, has good forming performance, but is observed that the sample is bright and has slight collapse phenomenon in the printing process. See figure 8 for details.
Example 5
The testing method for the consistency of the extruded 3D printing medical ceramic slurry comprises the following steps:
the preparation method comprises the following steps of selecting medical ceramic powder beta-TCP and HA and PVA aqueous solution as binders, and uniformly stirring a proper amount of ceramic powder (HA: beta-TCP = 3) and PVA aqueous solution with the concentration of 12% by using a homogenizer, wherein the mass ratio of the ceramic powder to the polyvinyl alcohol is 5.
And 2, after the third charging is finished, inclining one surface of the scraper with the angle to enable the scraper to be flush with the surface of the ceramic slurry, and scraping the surface of the ceramic slurry. Adjusting the upper and lower positions of the magnet to make the solid needle flush with the surface of the ceramic slurry, and reading the scale value corresponding to the lug 12 to be h 1 。
Selecting 5 points according to the test method in the operation steps 1, 2 and 3 to obtain penetration value H 1 、H 2 、H 3 、H 4 、H 5 In which H 1 ＝6mm、H 2 ＝7mm、H 3 ＝8mm、H 4 ＝8mm、H 5 =6mm. Then the mean of the 5 points is:
the ceramic slurry with the penetration value of 7mm is used as extrusion type 3D printing slurry, and the printing result shows that the slurry with the consistency can be extruded under the same air pressure extrusion condition, but a smooth and continuous straight line cannot be printed due to the fact that the consistency of the slurry is too low. See figure 9 for details.
The results of the above embodiments are combined to show that when the needle penetration degree of the stirred medical ceramic paste slurry is too large, the consistency of the medical ceramic slurry is small, and under the same printing condition, the extrusion type 3D printing can be extruded, but the forming effect is not good, and the paste is in a shape of a lump; when the needle penetration of the medical ceramic paste slurry is too small, the paste ceramic slurry has high consistency, and the extrusion type 3D printing cannot be extruded under the same printing condition; when the penetration value of the medical paste ceramic slurry is more than 3mm and less than or equal to 6mm, the slurry can print uniform and smooth continuous fine line lines, and the forming effect is good. After the data are obtained, when the consistency of the ceramic slurry is judged to be proper or not in the follow-up process, the consistency of the ceramic slurry is not required to be judged to be used for printing or not by printing, but the penetration value is measured by adopting the device and the measuring method, when the penetration value is more than 3mm and less than or equal to 6mm, the printing can be directly used, otherwise, the printing cannot be used, and the re-allocation is required.
Claims (7)
1. The device for measuring the consistency of the medical ceramic slurry through extrusion type 3D printing is characterized by comprising a connecting support (2), a volumetric flask (4) and a cylinder body (5); the connecting support (2) comprises a vertical rod and a cross rod, and the cross rod is fixed on the vertical rod through a screwing screw (3);
the top of the cylinder body (5) is fixedly connected to a cross bar on the connecting bracket (2); a cylindrical body (10) is coaxially arranged in the cylinder body (5), the bottom of the cylindrical body (10) is connected with a solid needle head (11), the solid needle head (11) extends out of the bottom of the cylinder body (5), and the cylindrical body (10) can move up and down in the cylinder body (5); the cylinder body (5) is provided with scale marks reflecting the height of the position;
when the medical ceramic slurry bottle is used, the volumetric flask (4) is positioned below the cylinder body (5), medical ceramic slurry is contained in the volumetric flask (4), the longitudinal position of the cylindrical body (10) is adjusted firstly, the end part of the solid needle head (11) is flush with the surface of the medical ceramic slurry, the position height of the cylindrical body (10) is read, and then the cylindrical body (10) is freely dropped for set time and then the position height of the cylindrical body (10) is read;
two strip-shaped through holes (7) are axially formed in the barrel body (5), the two strip-shaped through holes (7) are oppositely arranged, and scale marks are arranged on the edges of the strip-shaped through holes (7); two lugs (12) are arranged on the outer surface of the upper end of the cylindrical body (10), the two lugs (12) are arranged oppositely, and each lug (12) extends out of the corresponding elongated through hole (7) on the cylinder body (5);
also comprises a columnar body fixing structure; when the medical ceramic slurry fixing structure is used, the longitudinal position of the cylindrical body (10) is adjusted firstly by the cylindrical body fixing structure, and the cylindrical body (10) is fixed, so that the needle point of the solid needle head (11) is flush with the surface of the medical ceramic slurry; then the cylindrical body fixing structure releases the cylindrical body (10) to enable the cylindrical body (10) to fall freely;
the columnar body fixing structure comprises a magnet (9) and a metal strip (6), the cylinder body (5) is made of stainless steel, the magnet (9) is adsorbed on the outer surface of the cylinder body (5), and two sides of the magnet (9) are respectively provided with a fixing ring (8); when the cylindrical body (10) needs to be fixed, one end of the metal strip (6) penetrates through one fixing ring (8) to extend to one long-strip-shaped through hole (7) of the cylinder body (5), the other end of the metal strip (6) penetrates through the other fixing ring (8) to extend to the other long-strip-shaped through hole (7) of the cylinder body (5), and a lug (12) on the cylindrical body (10) is hung on the metal strip (6); when the cylindrical body (10) is required to freely fall, the metal strip (6) is pulled outwards, and the two ends of the metal strip (6) are separated from the strip-shaped through hole (7) of the cylinder body (5).
2. The apparatus for measuring the consistency of extruded 3D printed medical ceramic paste according to claim 1, wherein a solid needle (11) is screwed with the bottom of the cylinder (10).
3. The measuring device for the consistency of extruded 3D printed medical ceramic paste according to claim 1, wherein the cylindrical body (10) is a plastic cylinder.
4. The device for measuring the consistency of extruded medical ceramic paste for 3D printing according to claim 1, further comprising a stage (1), wherein the connecting bracket (2) is fixed on the stage (1), and when in use, the volumetric flask (4) is placed on the stage (1).
5. The measuring device for the consistency of extruded 3D printed medical ceramic slurry according to claim 1, further comprising a scraper (13) and a stopwatch; when in use, the scraper (13) is used for scraping the surface of the medical ceramic slurry in the volumetric flask (4), and the stopwatch is used for timing when the columnar body (10) falls freely.
6. Method for measuring the consistency of extruded 3D printed medical ceramic paste, characterized in that with a measuring device according to any of claims 1-5, it comprises:
step 1: filling the medical ceramic slurry into a volumetric flask;
step 2: adjusting the longitudinal position of the cylindrical body to make the end of the solid needle flush with the surface of the medical ceramic slurry, and reading the corresponding scale value of the cylindrical body to be h 1 ；
And step 3: the column is allowed to fall freely for a set time, and the scale value corresponding to the column at the moment is read as h 2 H is to be 2 And h 1 The difference value of the magnetic field is recorded as the penetration value of the medical ceramic slurry, and the medical ceramic slurry is reflected by the penetration valueConsistency of the material.
7. The method for measuring the consistency of the extruded 3D printed medical ceramic slurry of claim 6, further comprising:
and 4, step 4: and (4) repeating the steps (2) and (3), measuring to obtain penetration values of a plurality of different position points on the surface of the medical ceramic slurry, calculating a mean value H of the penetration of the plurality of different position points, and reflecting the consistency of the medical ceramic slurry by using the size of the mean value H of the penetration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011122391.6A CN112284973B (en) | 2020-10-19 | 2020-10-19 | Device and method for measuring consistency of medical ceramic slurry for extrusion type 3D printing |
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