CN111929200B - Fluidity measuring device and method for 3D printed concrete material - Google Patents
Fluidity measuring device and method for 3D printed concrete material Download PDFInfo
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- CN111929200B CN111929200B CN202011081139.5A CN202011081139A CN111929200B CN 111929200 B CN111929200 B CN 111929200B CN 202011081139 A CN202011081139 A CN 202011081139A CN 111929200 B CN111929200 B CN 111929200B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention provides a fluidity measuring device and method for a 3D printed concrete material. The invention solves the problem of quantitative measurement of the fluidity of the 3D printing concrete material, and provides conditions for safe implementation of 3D printing construction. The method can be suitable for quantitative measurement of the fluidity of the 3D printed concrete material with any mixing proportion, and has the advantages of simple operation, high reliability and the like.
Description
Technical Field
The invention relates to a fluidity measuring device and method for a 3D printed concrete material.
Background
Concrete materials used for architectural 3D printing must have a certain fluidity in order to flow in the printing system and extrude through the print head to perform the printing job. At the same time, the concrete material flow must be stabilized to prevent segregation during the flow. Therefore, measuring the fluidity of 3D printed concrete materials is an indispensable and absent step before printing construction. The method for measuring the concrete fluidity in the traditional construction comprises a slump experiment, an L-shaped flow experiment, a J-shaped flow experiment, a V-shaped flow experiment and the like, however, the 3D printing process is obviously different from the traditional construction process, the 3D printing process is extruded by a screw or pressure, in addition, in order to ensure the precision, the used concrete material aggregate has small particle size or does not contain coarse aggregate, and obviously, the traditional concrete fluidity measurement method does not meet the new requirement.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the flowability of a 3D printed concrete material.
In order to solve the above problems, the present invention provides a fluidity measuring apparatus for 3D-printed concrete material, comprising a spiral pipe, a switching timer, a nozzle simulation member, a connector, a measuring vessel, a simulation pressure pump and a pressure pipe, wherein,
the spiral pipe comprises a first section of spiral pipe, a spiral pipe standard part and a spiral pipe connecting part, wherein the spiral pipe connecting part is used for connecting the first section of spiral pipe and the spiral pipe standard part and connecting each spiral pipe standard part;
the switch timer comprises a switch sensor and a timer connected with the switch sensor, wherein the switch timer is installed on the spiral pipe, when the concrete material to be measured passes through the section of the spiral pipe on which the switch timer is installed, the switch sensor responds to record the current absolute time, rapidly feeds back the timer and starts to time;
the lower end of the nozzle simulation piece is connected with the upper end of the first section of the spiral pipe through a connector, the nozzle simulation piece is used for simulating nozzles with different diameters, the nozzle simulation piece is realized in a 3D printing mode, and one end of the nozzle simulation piece is connected with the first section of the spiral pipe through the connector;
the lower extreme of measuring the container pass through the connector with the nozzle simulation piece is connected, it includes lower part container, stop valve, container connecting piece, upper portion container and pressure pipe connecting piece to measure the container, and wherein, the lower extreme of lower part container passes through the connector and is connected with the nozzle simulation piece, and the stop valve is installed in lower part container bottom, and the container connecting piece is used for sealing lower part container and upper portion container, the lower surface of upper portion container and the upper surface in close contact with of lower part container, the pressure pipe connecting piece set up in on the upper portion container, the pressure pipe connecting piece of measuring the container passes through the pressure pipe and is connected with the analog pressure pump.
Furthermore, in the device, the first section of the spiral pipe and the standard part of the spiral pipe are made of transparent glass and organic glass materials; the diameter of the spiral pipe isDThat is, the diameters of the first section of the spiral pipe (110) and the spiral pipe standard part (120) are respectivelyD ，DThe value of (a) is the maximum particle size of the 3D printed concrete materialD C 3-5 times of the total weight of the powder.
Further, in the above device, the length of the first-stage spiral pipe isL 0 The length of each spiral pipe standard part is respectivelyL 1、…L N 。
Furthermore, in the above device, the switch timer is arranged below the joint of the first section of the spiral pipe and the connector and on the spiral pipe connecting piece of each spiral pipe standard piece.
Further, in the above device, the nozzle simulation piece includes a nozzle simulation piece housing, a nozzle simulation inner cavity standard piece and a nozzle simulation sealing piece, wherein the nozzle simulation inner cavity standard piece is located inside the nozzle simulation piece housing, and the nozzle simulation sealing piece is located at two ends of the nozzle simulation inner cavity standard piece.
Further, in the above apparatus, the diameter of the nozzle simulation chamber standard is the diameter of a series of nozzles used in the 3D printing apparatus, and the minimum diameter of the nozzle simulation chamber standard isR=aThe maximum diameter of the nozzle simulation inner cavity standard part isR=bThe diameter increment of the nozzle simulation inner cavity standard part in the nozzle simulation part isδ。
According to another aspect of the present invention, there is also provided a method for measuring fluidity of a 3D printed concrete material, using the apparatus of any one of the above, the method comprising:
step S01, selecting a nozzle simulation piece with a corresponding diameter;
step S12, installing a spiral pipe, a switch timer, a nozzle simulation piece, a connector and a lower container with a stop valve in sequence;
step S13, concrete material for 3D printing is loaded: closing the stop valve, and filling the newly mixed 3D printed concrete material into a lower container;
step S14, the device installation is completed: installing a container connecting piece and an upper container with a pressure pipe connecting piece and fastening the container connecting piece; one end of the pressure pipe is connected with the analog pressure pump, and the other end of the pressure pipe is connected with a pressure pipe connecting piece of the measuring container;
step S15, test of fluidity: adjusting the pressure of the analog pressure pump to enable the analog pressure pump to be in pressure value with the 3D printing devicePThe same; opening the stop valve to start the concrete material to be measured to flow, and when the concrete material to be measured passes through the screw provided with the switch timerThe section of the coil and the response of the switch sensor record the current absolute time and quickly feed back a timer to start timing, wherein the switch timers are respectivelyT 0、T 1、T 2、…T N，T 0、T 1、T 2、…T NThe number of the timers having a count isM（M≤N) Absolute times recorded are respectivelyt 0、t 1、t 2、…t M(ii) a The length of the standard part passing through the spiral pipe is sequentiallyL 1、L 2、…L M ；
Step S16, calculating the fluidity of the concrete material to be measured: calculating the fluidity F of the concrete material to be measured according to the formula (1)C ：
Step S17, evaluating the fluidity of the concrete material to be tested: if the fluidity of the concrete material to be tested isF C Satisfies the allowable rangee min ,e max ]The concrete material to be tested can be used for 3D printing, wherein,e min ande max respectively, an allowable minimum value and an allowable maximum value;
and if the interval requirement is not met, adjusting the proportion of the concrete components and the additives, and continuously measuring according to the repeated steps S12-S17 until the interval requirement is met.
Further, in the above method, in step S01, selecting a nozzle simulation piece with a corresponding diameter includes:
selecting the diameter of the nozzle of the printing head of the 3D printing device according to the diameter of the nozzle of the printing head of the 3D printing deviceREquivalent nozzle mimetics.
Further, in the above method, in step S01, selecting a nozzle simulation piece with a corresponding diameter includes:
step S21, selecting the output pressure of the 3D printing device according to the output pressure of the used 3D printing devicePThe minimum value of (a) is used as the output pressure of the analog pressure pump;
step S22, according to the diameter of the nozzle of the print head of the 3D printing device used, selecting the maximum value of the diameter of the nozzle of the print head of the 3D printing device as the diameter of the nozzle simulation piece, and selecting the nozzle simulation piece with the corresponding diameter.
Further, in the method, after repeating steps S12 to S17 until the interval requirement is satisfied, the method includes:
step S31, selecting the maximum value of the diameter of the nozzle of the printing head of the 3D printing device as the diameter of the nozzle simulation piece according to the diameter of the nozzle of the printing head of the used 3D printing device, and selecting the nozzle simulation piece with the corresponding diameter;
step S32, partial installation of the device: sequentially installing a spiral pipe, a switch timer, a nozzle simulation piece and a connector, and connecting the nozzle simulation piece with a nozzle of a 3D printing device through the connector;
step S33, adjusting the output pressure of the used 3D printing device, and respectively adjusting the minimum value and the maximum value of the pressure;
step S34, respectively calculating the fluidity F of the concrete material to be measured under the minimum value and the maximum value of the pressure according to the formula (1)C：
Step S35, evaluating the fluidity of the concrete material to be tested: if the fluidity of the concrete material to be tested isF C Satisfies the allowable rangee min ,e max ]Then, the printing construction of the 3D printing apparatus is carried out, wherein,e min ande max respectively, an allowable minimum value and an allowable maximum value;
and if the requirement is not met, fine adjustment is carried out on the proportion of the concrete components and the additive, calculation is continuously carried out according to the repeated steps S33-S35, and the 3D printing device is subjected to printing construction after the interval requirement is met.
Compared with the prior art, the invention comprises a spiral pipe, a switch timer, a nozzle simulation piece, a connector, a measuring container, a simulation pressure pump and a pressure pipe. The invention solves the problem of quantitative measurement of the fluidity of the 3D printing concrete material, and provides conditions for safe implementation of 3D printing construction. The method can be suitable for quantitative measurement of the fluidity of the 3D printed concrete material with any mixing proportion, and has the advantages of simple operation, high reliability and the like.
Drawings
Fig. 1 is a schematic view of a fluidity measuring apparatus for 3D printed concrete material according to an embodiment of the present invention;
FIG. 2 is a schematic view of a spiral pipe in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a nozzle simulator 300 in accordance with an embodiment of the invention;
fig. 4 is a schematic diagram of a connection between a nozzle simulator and a nozzle of a 3D printing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, the present invention provides a fluidity measuring apparatus for a 3D printed concrete material, comprising a spiral pipe 100, a switching timer 200, a nozzle simulator 300, a connector 400, a measuring container 500, a simulated pressure pump 600 and a pressure pipe 700, wherein,
the spiral pipe 100 comprises a first section of spiral pipe 110, a spiral pipe standard part 120 and a spiral pipe connecting part 130, wherein the spiral pipe connecting part 130 is used for connecting the first section of spiral pipe 110 and the spiral pipe standard part 120 and connecting each spiral pipe standard part 120, and optionally, the first section of spiral pipe 110 and the spiral pipe standard part 120 can be made of transparent glass, organic glass and other materials; optionally, the diameter of the spiral pipe 100 isDI.e. the diameter of the first section of the spiral pipe 110 isDStandard of each spiral pipeMember 120 also has a diameter ofD，DThe value of (a) is the maximum particle size of the 3D printed concrete materialD C 3-5 times of the total weight of the composition; optionally, the first-stage spiral pipe 110 has a length ofL 0 The length of each spiral pipe standard piece 120 is respectivelyL 1、…L N ；
The switching timer 200 comprises a switching sensor and a timer connected with the switching sensor, wherein the switching timer 200 is installed on the spiral pipe 100, when the concrete material to be measured passes through the section of the spiral pipe 100 where the switching timer 200 is installed, the switching sensor responds to record the current absolute time and quickly feeds back the timer to start timing, and preferably, the switching timer 200 is arranged below the joint of the first section of the spiral pipe 110 and the connector 400 (preferably: (1)T 0) And a coil connecting member 130 disposed on each of the coil standards 120T 1、T 2、…T N）；
The lower end of the nozzle simulator 300 is connected with the upper end of the first-section spiral pipe 110 through a connector 400 so as to facilitate quick connection and removal of each component, the nozzle simulator 300 is used for simulating nozzles with different diameters, the nozzle simulator 300 is realized in a 3D printing mode, and one end of the nozzle simulator 300 is connected with the first-section spiral pipe 110 through the connector 400; preferably, the nozzle simulator 300 includes a nozzle simulator housing 310, a nozzle simulation inner cavity standard 320 and a nozzle simulation sealing member 330, wherein the nozzle simulation inner cavity standard 320 is located inside the nozzle simulator housing 310, and the nozzle simulation sealing member 330 is located at both ends of the nozzle simulation inner cavity standard 320; preferably, the diameter of the nozzle simulation cavity standard 320 is the diameter of a series of nozzles used in a 3D printing device, and the minimum diameter of the nozzle simulation cavity standard 320 isR=aThe maximum diameter of the nozzle simulation inner cavity standard member 320 isR=bThe nozzle simulation inner cavity standard part 320 of the nozzle simulation part 300 has the diameter increment ofδ0.1mm, 0.2mm, 0.5mm and the like can be selected;
the lower end of the measuring container 500 is connected to the nozzle simulator 300 through a connector 400 to facilitate the rapid connection and removal of the respective components, the measuring container 500 includes a lower container 510, a cut-off valve 520, a container connector 530, an upper container 540, and a pressure pipe connector 550, wherein the lower end of the lower container 510 is connected to the nozzle simulator 300 through the connector 400, the cut-off valve 520 is installed at the bottom of the lower container 510, the container connector 530 is used to seal the lower container 510 and the upper container 540, the lower surface of the upper container 540 is in close contact with the upper surface of the lower container 510, the pressure pipe connector 550 is disposed on the upper container 540, and the pressure pipe connector 550 of the measuring container 500 is connected to the simulation pressure pump 600 through a pressure pipe 700, so that pressure can be accurately input to simulate the pressure of the print head.
The invention solves the problem of quantitative measurement of the fluidity of the 3D printing concrete material, and provides conditions for safe implementation of 3D printing construction. The method can be suitable for quantitative measurement of the fluidity of the 3D printed concrete material with any mixing proportion, and has the advantages of simple operation, high reliability and the like.
As shown in fig. 1 and 4, the present invention further provides another method for measuring fluidity of 3D printed concrete material, using the apparatus according to any of the embodiments, the method comprising:
step S11, selecting the diameter of the nozzle simulation piece: the diameter of the nozzle 800 of the printing head of the 3D printing device is selected according to the diameter of the nozzle 800 of the printing head of the 3D printing device usedRAn equal nozzle simulator 300;
step S12, partial installation of the device: sequentially installing a solenoid 100, a switch timer 200, a nozzle simulator 300, a connector 400, and a lower container 510 having a shut-off valve 520;
step S13, concrete material for 3D printing is loaded: closing the shut-off valve 520, and loading the freshly mixed 3D printed concrete material into the lower container 510;
step S14, the device installation is completed: installing vessel coupler 530, upper vessel 540 with pressure tube coupler 550, and securing vessel coupler 530; one end of the pressure tube 700 is connected to the analog pressure pump 600, and the other end of the pressure tube 700 is connected to the pressure tube connection 550 of the measuring container 500;
step S15, test of fluidity: adjusting the pressure of the analog pressure pump 600 to be equal to the pressure value of the 3D printing devicePThe same; starting the stop valve 520, the concrete material to be measured starts flowing, when the concrete material to be measured passes through the section of the spiral pipe 100 provided with the switch timer 200, the switch sensor responds to record the current absolute time, and rapidly feeds back the timer to start timing, wherein the switch timers 200 are respectivelyT 0、T 1、T 2、…T N，T 0、T 1、T 2、…T NThe number of the timers having a count isM（M≤N) Absolute times recorded are respectivelyt 0、t 1、t 2、…t M(ii) a The length of the standard 120 passing through the spiral tube is sequentiallyL 1、L 2、…L M ；
Step S16, calculating the fluidity of the concrete material to be measured: calculating the fluidity of the concrete material to be measured according to the formula (1)F C ：
Wherein L is1Corresponds to t1To t0This time period, and so on.
Step S17, evaluating the fluidity of the concrete material to be tested: if the fluidity of the concrete material to be tested isF C Satisfies the allowable rangee min ,e max ]Wherein, in the step (A),e min ande max the minimum and maximum values allowed, respectively, can be determined experimentally,
and the concrete material to be measured can be used for 3D printing, if the interval requirement is not met, the proportion of concrete components and additives is adjusted, and the measurement is continuously carried out according to the repeated steps S12-S17 until the interval requirement is met.
Here, the present embodiment is a method for measuring fluidity of a 3D printed concrete material under a constant pressure and a constant diameter (P = constant; R = constant).
As shown in fig. 1 and 4, in an embodiment of the method for measuring fluidity of a 3D printed concrete material according to the present invention, the method further includes:
step S21, determination of the simulated pressure pump pressure value: selecting the output pressure of the 3D printing device according to the output pressure of the used 3D printing deviceOf PThe minimum value is used as the output pressure of the analog pressure pump 600;
here, in the present embodiment, the 3D printing apparatus outputs the pressurePIn the case of not equal to the constant, the output pressure of the 3D printing device can be selectedOf PThe minimum value is used as the output pressure of the analog pressure pump 600;
in step S22, a nozzle simulator diameter is selected. The diameter of the nozzle 800 of the print head of the 3D printing apparatus is chosen according to the diameter of the nozzle 800 of the print head of the 3D printing apparatus usedRThe maximum value of (a) is taken as the diameter of the nozzle simulant 300, and the nozzle simulant 300 of the corresponding diameter is selected;
here, the diameter of the nozzle 800 of the print head of the 3D printing apparatus in the present embodimentRNot equal to a constant, the diameter of the nozzle 800 of the print head of the 3D printing device can be chosenRAs the diameter of the nozzle simulator 300;
and repeating the steps S12-S17 until the interval requirement is met. I.e. if the fluidity of the concrete material to be tested isF C And if the interval requirement is not met, adjusting the proportion of concrete components and additives, and continuously repeating the steps S12-S17 to measure until the interval requirement is met.
In this example, the fluidity of the 3D-printed concrete material was measured under variable pressure and variable diameter conditions (P ≠ constant; R ≠ constant).
As shown in fig. 4, in an embodiment of the method for measuring fluidity of a 3D printed concrete material according to the present invention, the steps S12 to S17 are repeated until the interval requirement is satisfied, and the method includes:
step S31, selecting the diameter of the nozzle simulation piece: selecting the maximum value of the diameter of the nozzle 800 of the printing head of the 3D printing device as the diameter of the nozzle simulation piece 300 according to the diameter of the nozzle 800 of the printing head of the used 3D printing device, and selecting the nozzle simulation piece 300 with the corresponding diameter;
step S32, partial installation of the device: the solenoid 100, the switching timer 200, the nozzle simulation member 300, and the connector 400 are installed in sequence as shown in fig. 4, and the nozzle simulation member 300 is connected to the nozzle 800 of the 3D printing apparatus through the connector 400, where the measuring container 500 is replaced with the 3D printing apparatus nozzle 800,
in order to evaluate the fluidity of any 3D printed concrete material, in the previous embodiment, the measurement container 500 may be used to perform simulation test evaluation by simulating the pressure and diameter during the test;
in this embodiment, before actual printing construction, in order to evaluate the feasibility of the application of the 3D printing concrete material in the printing device, the measuring container 500 is replaced with the 3D printing device nozzle 800, a device for measuring the fluidity of the 3D printing concrete material is connected with the 3D printing device nozzle 800 for testing, and formal printing is performed only after conditions are met;
step S33, different pressure printing test: adjusting the output pressure of the used 3D printing device, and respectively adjusting the minimum value and the maximum value of the pressure;
step S34, calculating the fluidity of the concrete material to be measured: respectively calculating the fluidity of the concrete material to be measured under the minimum value and the maximum value of the pressure according to the formula (1)F C ：
Step S35, evaluating the fluidity of the concrete material to be tested: if the fluidity of the concrete material to be tested isF C Satisfies the allowable rangee min ,e max ]Wherein, in the step (A),e min ande max the minimum and maximum values allowed, respectively, can be determined experimentally,
and carrying out printing construction of the 3D printing device, if the requirements are not met, fine adjusting the proportion of concrete components and additives, continuing to calculate according to the repeated steps S33-S35, and carrying out printing construction of the 3D printing device until the interval requirements are met.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. A fluidity measuring device of a 3D printed concrete material is characterized by comprising a spiral pipe (100), a switch timer (200), a nozzle simulation piece (300), a connector (400), a measuring container (500), a simulation pressure pump (600) and a pressure pipe (700),
the spiral pipe (100) comprises a first section of spiral pipe (110), spiral pipe standard parts (120) and spiral pipe connecting parts (130), wherein the spiral pipe connecting parts (130) are used for connecting the first section of spiral pipe (110) with the spiral pipe standard parts (120) and connecting the spiral pipe standard parts (120);
the switch timer (200) comprises a switch sensor and a timer connected with the switch sensor, wherein the switch timer (200) is installed on the spiral pipe (100), and when the concrete material to be measured passes through the section of the spiral pipe (100) where the switch timer (200) is installed, the switch sensor responds to record the current absolute time and quickly feeds back the timer to start timing;
the lower end of the nozzle simulation piece (300) is connected with the upper end of the first section of spiral pipe (110) through a connector (400), the nozzle simulation piece (300) is used for simulating nozzles with different diameters, the nozzle simulation piece (300) is realized in a 3D printing mode, and one end of the nozzle simulation piece (300) is connected with the first section of spiral pipe (110) through the connector (400);
the lower end of the measuring vessel (500) is connected to the nozzle simulator (300) by a connector (400), the measuring vessel (500) comprises a lower vessel (510), a shut-off valve (520), a vessel connection (530), an upper vessel (540) and a pressure pipe connection (550), wherein the lower end of the lower container (510) is connected with the nozzle simulator (300) by a connector (400), the shut-off valve (520) is installed at the bottom of the lower container (510), the container connector (530) is used to seal the lower container (510) and the upper container (540), the lower surface of the upper container (540) is in close contact with the upper surface of the lower container (510), the pressure tube connection (550) is disposed on the upper reservoir (540), the pressure pipe connector (550) of the measuring container (500) is connected with the analog pressure pump (600) through a pressure pipe (700);
the first section of spiral pipe (110) and the spiral pipe standard part (120) are made of transparent glass and organic glass materials; the diameter of the spiral pipe (100) is D, namely the diameters of the first section of spiral pipe (110) and the spiral pipe standard part (120) are D respectively, and the value of D is the maximum grain diameter D of the 3D printed concrete materialC3-5 times of the total weight of the composition;
the length of the first section of the spiral pipe (110) is L0The length of each spiral pipe standard part (120) is L in sequence1、…LN；
The switch timer (200) is arranged below the joint of the first section of the spiral pipe (110) and the connector (400) and on the spiral pipe connecting piece (130) of each spiral pipe standard piece (120);
the nozzle simulation piece (300) comprises a nozzle simulation piece shell (310), a nozzle simulation inner cavity standard piece (320) and a nozzle simulation sealing piece (330), wherein the nozzle simulation inner cavity standard piece (320) is positioned in the nozzle simulation piece shell (310), and the nozzle simulation sealing piece (330) is positioned at two ends of the nozzle simulation inner cavity standard piece (320);
the diameter of the nozzle simulation inner cavity standard part (320) is the diameter of a series of nozzles used by a 3D printing device, the minimum diameter of the nozzle simulation inner cavity standard part (320) is R ═ a, the maximum diameter of the nozzle simulation inner cavity standard part (320) is R ═ b, and the diameter increment of the nozzle simulation inner cavity standard part (320) in the nozzle simulation part (300) is delta.
2. A method for 3D printing a fluidity measurement of a concrete material, characterized in that, using the device of claim 1, the method comprises:
step S01, selecting a nozzle simulation piece (300) with a corresponding diameter;
step S12, installing a spiral pipe (100), a switch timer (200), a nozzle simulation piece (300), a connector (400) and a lower container (510) with a stop valve (520) in sequence;
step S13, closing the stop valve (520), and loading the newly mixed 3D printed concrete material into the lower container (510);
step S14, installing container coupler (530), upper container (540) with pressure tube coupler (550), and tightening container coupler (530); connecting one end of the pressure pipe (700) to the analog pressure pump (600), and connecting the other end of the pressure pipe (700) to a pressure pipe connecting piece (550) of the measuring container (500);
step S15, adjusting the pressure of the analog pressure pump (600) to be the same as the pressure value P of the 3D printing device; opening a stop valve (520), starting the concrete material to be measured to flow, when the concrete material to be measured passes through the section of a spiral pipe (100) provided with a switch timer (200), responding by a switch sensor, recording the current absolute time, rapidly feeding back the timer and starting timing, wherein the switch timers (200) are respectively T0、T1、T2、…TN，T0、T1、T2、…TNThe number of the timers with the counting is M, M is less than or equal to N, and the recorded absolute time is t0、t1、t2、…tM(ii) a The length of the concrete material to be measured passing through the spiral pipe standard part (120) is L in sequence1、L2、…LM；
Step S16, calculating the fluidity F of the concrete material to be measured according to the following formulaC：
Step S17, if the fluidity of the concrete material to be tested FCSatisfies the allowable interval [ emin,emax]And the concrete material to be tested can be used for 3D printing, wherein eminAnd emaxRespectively, an allowable minimum value and an allowable maximum value;
if the interval requirement is not met, adjusting the proportion of concrete components and additives, and continuing to measure according to the repeated steps S12-S17 until the interval requirement is met;
step S01, selecting a nozzle simulator (300) having a corresponding diameter, including:
selecting a nozzle simulation piece (300) with the diameter equal to that of a nozzle (800) of a printing head of the 3D printing device according to the diameter of the nozzle (800) of the printing head of the used 3D printing device;
alternatively, step S01, selecting a nozzle simulator (300) having a corresponding diameter, includes:
step S21, selecting the minimum value of the output pressure of the 3D printing device as the output pressure of the analog pressure pump (600) according to the output pressure of the used 3D printing device;
step S22, selecting the maximum value of the diameter of the nozzle (800) of the printing head of the 3D printing device as the diameter of the nozzle simulation piece (300) according to the diameter of the nozzle (800) of the printing head of the used 3D printing device, and selecting the nozzle simulation piece (300) with the corresponding diameter;
repeating the steps S12-S17 until the interval requirement is met, and then:
step S31, selecting the maximum value of the diameter of the nozzle (800) of the printing head of the 3D printing device as the diameter of the nozzle simulation piece (300) according to the diameter of the nozzle (800) of the printing head of the used 3D printing device, and selecting the nozzle simulation piece (300) with the corresponding diameter;
step S32, installing the spiral tube (100), the switch timer (200), the nozzle simulation piece (300) and the connector (400) in sequence, and connecting the nozzle simulation piece (300) with the nozzle (800) of the 3D printing device through the connector (400);
step S33, adjusting the output pressure of the used 3D printing device, and respectively adjusting the minimum value and the maximum value of the pressure;
step S34, respectively calculating the fluidity F of the concrete material to be measured under the minimum value and the maximum value of the pressure according to the following formulaC：
Step S35, evaluating the fluidity of the concrete material to be tested: if the fluidity F of the concrete material to be measuredCSatisfies the allowable interval [ emin,emax]Then, the printing construction of the 3D printing device is carried out, wherein eminAnd emaxRespectively, an allowable minimum value and an allowable maximum value;
and if the requirement is not met, fine adjustment is carried out on the proportion of the concrete components and the additive, calculation is continuously carried out according to the repeated steps S33-S35, and the 3D printing device is subjected to printing construction after the interval requirement is met.
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| CN102323184B (en) * | 2011-08-12 | 2013-05-01 | 哈尔滨理工大学 | Visual testing device for liquid metal fluidity and testing method based on it |
| CN103344524A (en) * | 2013-06-24 | 2013-10-09 | 上海工程技术大学 | Test method for flowability of high polymer melt in Archimedes spiral die |
| CN107192638A (en) * | 2017-05-11 | 2017-09-22 | 武汉理工大学 | A kind of Portable viscometer of application infrared photoelectric sensor |
| CN108414688B (en) * | 2018-03-05 | 2020-05-22 | 中南大学 | Piston and pneumatic dual-purpose 3D print biomaterial extrusion test device |
| CN208653526U (en) * | 2018-05-31 | 2019-03-26 | 武汉梓豪创新科技有限公司 | A kind of data analysis system for 3D printing production system |
| CN110296910A (en) * | 2019-06-28 | 2019-10-01 | 内蒙古科技大学 | A kind of approach switch sensor measurement coefficient of viscosity measuring instrument |
| CN110954442B (en) * | 2019-11-12 | 2021-02-02 | 同济大学 | Online testing method for 3D printing dynamic characteristics of cement-based material |
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