CN109991054A - A kind of 3D printing concrete sample molding machine and forming method - Google Patents
A kind of 3D printing concrete sample molding machine and forming method Download PDFInfo
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- CN109991054A CN109991054A CN201910226465.1A CN201910226465A CN109991054A CN 109991054 A CN109991054 A CN 109991054A CN 201910226465 A CN201910226465 A CN 201910226465A CN 109991054 A CN109991054 A CN 109991054A
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- side form
- connecting hole
- bed die
- concrete
- fixed plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention discloses 3D printing concrete sample molding machines, including mold and loading hopper, mold includes bed die, side form and fixed plate, the four corners of bed die are equipped with bed die connecting hole, fixed plate is arranged on side form, fixed plate is equipped with fixed plate connecting hole, side form includes side form unit and locating rod, each side form unit is the rectangle template being put together by two U-shaped side plates, the corner of U-shaped side plate is vertically equipped with side plate connecting hole, locating rod setting connects in side plate connecting hole, and by bed die, side form with fixed plate.The bottom of loading hopper is equipped with position-limit mechanism, and loading hopper is erected on side form by position-limit mechanism.It is approached using the compression strength and anti-freezing property of the prepared test specimen of the device and using the molding test specimen of concrete 3D printer.And it does not need to reduce testing expenses using concrete 3D printer.The cutting of 3D printing concrete sample is avoided simultaneously, polishes technique, improves test specimen mechanical property and endurance quality measuring accuracy.
Description
Technical field
The present invention relates to concrete sample technical field, specially a kind of 3D printing concrete sample molding machine and molding
Method.
Background technique
Concrete 3D printing technique is that benefit is computerizedd control 3D printer, according to the path of setting by concrete delamination heap
Product forms building element.Currently, there has been no universally recognized 3D printing concrete material basic performance test devices and test side
Method, it is general that directly 3D printing concrete is tested with reference to common concrete material performance test methods, or use 3D printing
Machine prints 3D concrete sample, and intensity or endurance quality test are carried out after cutting polishes processing.The former is with reference to common mixed
Solidifying soil test method, by the 3D printing concreting prepared into die trial, process, forming process and the 3D such as vibrated
Printing technology is not inconsistent, it is difficult to react the actual performance of 3D printing concrete material.The latter is directly printed using 3D printer, due to
Without template, 3D printing surface of test piece poor flatness cannot be used directly to experimental test, need to use cutting machine cutting smooth, general
Logical cutting process it is difficult to ensure that test block adjacent surface verticality, test carries out when strength test that two compression faces are not parallel, causes
Test result error is larger.And the process requirement concrete 3D printer, expensive, input cost is larger.
Summary of the invention
The purpose of the present invention is to provide a kind of 3D printing concrete sample molding machine and forming methods, direct to solve
3D printing concrete is tested with reference to common concrete material performance test methods, it is difficult to react 3D printing concrete material
Actual performance；And 3D concrete sample is printed using 3D printer, intensity or durable is carried out after cutting polishes processing
Performance test, common cutting process it is difficult to ensure that test block adjacent surface verticality, test carry out strength test when two compression faces
It is not parallel, cause test result error larger, and need concrete 3D printer, expensive, the biggish skill of input cost
Art problem.
In order to solve the above technical problem, the present invention provides a kind of 3D printing concrete sample molding machines, including mold
And loading hopper, the mold include bed die, side form and fixed plate, the four corners of the bed die are equipped with bed die connecting hole, described
Fixed plate is arranged on side form, and fixed plate is equipped with fixed plate connecting hole, and the side form includes side form unit and locating rod, often
A side form unit is the rectangle template being put together by two U-shaped side plates, and the corner of U-shaped side plate is vertically equipped with side plate connection
Hole, the locating rod setting connect in side plate connecting hole, and by bed die, side form with fixed plate；
The bottom of the loading hopper is equipped with position-limit mechanism, and the loading hopper is erected on side form by position-limit mechanism.
Preferably, the side plate connecting hole is through-hole, and bed die connecting hole is inserted into one end of the locating rod, and the other end passes through
Side plate connecting hole and fixed plate connecting hole, and then bed die, side form are connected with fixed plate.
Preferably, the side plate connecting hole is blind hole, the locating rod be connected to bed die connecting hole and side plate connecting hole it
Between, between the side plate connecting hole and side plate connecting hole of adjacent form unit, between side plate connecting hole and fixed plate connecting hole, in turn
Bed die is connected with side form unit, adjacent side form unit, side form unit with fixed plate.
Preferably, the mold further includes backing plate, and the bottom of bed die is arranged in the backing plate.
Preferably, the loading hopper includes storing pipe, piston and compression bar, and the bottom of the storing pipe is equipped with discharge port, institute
It states compression bar to connect with piston, the piston is arranged in storing pipe and can slide up and down in storing pipe.
Preferably, the side wall of the piston is equipped with sealing ring.
Preferably, the position-limit mechanism includes wale piece and positioning sleeve, and the two sides of discharge port are arranged in the wale piece,
And the bottom surface of wale piece is concordant with the lower edge of discharge port, and wale piece is equipped with graduation mark, offers on the positioning sleeve
Threaded hole, positioning sleeve cover on wale piece, and are bolted.
In addition, being tried the present invention also provides a kind of 3D printing concrete sample forming method using above-mentioned 3D printing concrete
Part molding machine is realized, is included the following steps,
Step 1: brushing release agent on the side form unit of bed die and first layer is installed the side form list of bed die and first layer
Member forms first layer cavity；
Step 2: prepared concrete is injected in loading hopper；
Step 3: loading hopper is placed on the side form unit of first layer, cloth side is adjusted by regulation position limiting mechanism
To concrete is fed into first layer cavity according to the path and width of setting；
Step 4: the side form unit of the second layer is overlayed on the side form unit of first layer；
Step 5: repeating step 2 to three, concrete is fed into the cavity of upper layer according to the path and width of setting；
Step 6: repeat step 4 to five, by the cavity on concrete injection upper layer, until filling concrete is to setting layer
Number；
Step 7: concrete sample maintenance is finally removed mold to age is set.
Preferably, the position-limit mechanism includes wale piece and positioning sleeve, and the two sides of discharge port are arranged in the wale piece,
And the bottom surface of wale piece is concordant with the lower edge of discharge port, and wale piece is equipped with graduation mark, offers on the positioning sleeve
Threaded hole, positioning sleeve cover on wale piece, and are bolted；It is deep by adjusting the screw-in of bolt in the step 3
Degree makes two wale pieces on the same line.
Preferably, a small amount of concrete is squeezed out before the step 3, and is struck off the concrete squeezed out with floating rule.
Compared with prior art, it the features of the present invention and has the beneficial effect that
(1) the application makes 3D printing concrete sample using layer-stepping side form, not only realizes layer-by-layer preparation, but also can guarantee each
The verticality of adjacent surface and the planarization of surface of test piece, the compression strength of prepared test specimen is with anti-freezing property and using coagulation
The native molding test specimen of 3D printer is close.
(2) the application does not need to reduce testing expenses using concrete 3D printer, while avoiding 3D printing coagulation
Native test specimen cutting polishes technique, improves test specimen mechanical property and endurance quality measuring accuracy, and the performance test results and use are mixed
The solidifying soil molding test specimen of 3D printer is close.
(3) 3D printing concrete sample forming device structure of the invention is simple, is easy to make, cost is relatively low, Er Qiecao
Facilitate.
(4) present invention provides a kind of completely new mode for production 3D printing concrete sample, tries in 3D printing concrete
Part production aspect has good reference.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of 3D printing concrete sample molding machine (number of plies of side form unit is unlimited).
Fig. 2 is the structural schematic diagram of bed die.
Fig. 3 is the structural schematic diagram of U-shaped side plate.
Fig. 4 is the structural schematic diagram of fixed plate.
The structural schematic diagram of Fig. 5 another kind 3D printing concrete sample molding machine (number of plies of side form unit is unlimited).
Fig. 6 is the connection schematic diagram of side form unit and locating rod in Fig. 5.
Fig. 7 is the structural schematic diagram of loading hopper.
Fig. 8 is the connection schematic diagram of the discharge port of wale piece, positioning sleeve and loading hopper.
Fig. 9 is the structural schematic diagram of positioning sleeve.
Figure 10 is the usage state diagram of mold and loading hopper.
Appended drawing reference: 1- bed die, 101- bed die connecting hole, 2- side form, 21- side form unit, 211-U shape side plate, the side 212-
Plate connecting hole, 22- locating rod, 3- fixed plate, 31- fixed plate connecting hole, 4- backing plate, 5- storing pipe, 6- piston, 7- compression bar, 8-
Discharge port, 9- sealing ring, 10- pressing plate, 11- wale piece, 12- positioning sleeve, 13- threaded hole, 14- bolt.
Specific embodiment
For realize the present invention technological means, character of innovation, reach purpose and effect is easy to understand, below to
Invention further illustrates.
The embodiment recorded herein is specific specific embodiment of the invention, for illustrating design of the invention,
Be it is explanatory and illustrative, should not be construed as the limitation to embodiment of the present invention and the scope of the invention.Except what is recorded herein
Outside embodiment, those skilled in the art can also based on the claim of this application book and specification disclosure of that using aobvious and
The other technical solutions being clear to, these technical solutions include using any obvious to making for the embodiment recorded herein
The technical solution of substitutions and modifications.
As shown in figures 1-4, a kind of 3D printing concrete sample molding machine, mold include backing plate (4), bed die (1), side
Mould (2) and fixed plate (3), bed die (1) are arranged on backing plate (4), and the four corners of bed die (1) are equipped with bed die connecting hole (101),
Fixed plate (3) is arranged on side form (2), and fixed plate (3) is equipped with fixed plate connecting hole (31), and side form (2) includes side form list
First (21) and locating rod (22), each side form unit (21) are the rectangle template being put together by two U-shaped side plates (211), U-shaped
The corner of side plate (211) is vertically equipped with side plate connecting hole (212).Side form unit (21) is spelled using two U-shaped side plates (211)
It closes, is demoulding for convenience.U-shaped side plate (211) includes a long side and two short sides.U-shaped side plate (211) can select casting
Iron, steel or plastic or other material.Locating rod (22) is arranged in side plate connecting hole (212), and by bed die (1), side form (2) and consolidates
Fixed board (3) connection.A rectangular enclosure is formed between bed die (1) and side form (2), is used for concrete perfusion.The bottom of loading hopper
Equipped with position-limit mechanism, loading hopper is erected on side form (2) by position-limit mechanism.
Side plate connecting hole (212) is through-hole, and locating rod (22) is screw rod, and bed die connecting hole is inserted into one end of locating rod (22)
(101), the other end passes through side plate connecting hole (212) and fixed plate connecting hole (31), and then by bed die (1), side form (2) and fixes
Plate (3) connection.When installation mold, first bed die (1) is placed on backing plate (4), locating rod (22) are inserted into bed die connecting hole
(101) in, locating rod (22) sequentially passes through side plate connecting hole (212) and fixed plate connecting hole (31), by bed die (1), side form (2)
It connects, and is secured with nuts with fixed plate (3).Certainly it is not limited only between bed die (1), side form (2) and fixed plate (3) such
Connection type.
As shown in Fig. 5~6, side plate connecting hole (212) be blind hole, locating rod (22) be connected to bed die connecting hole (101) and
Between side plate connecting hole (212), between the side plate connecting hole (212) and side plate connecting hole (212) of adjacent form unit (21), side
Between plate connecting hole (212) and fixed plate connecting hole (31), and then by bed die (1) and side form unit (21), adjacent side form list
First (21), side form unit (21) and fixed plate (3) connection.When installation mold, first bed die (1) is placed on backing plate (4), then
Locating rod (22) on side form unit (21) is directed at bed die connecting hole (101), then upper layer side form unit (21) bottom is determined
Position bar (22) is directed at the side plate connecting hole (212) on lower layer side form unit (21), and side form unit (21) is pacified by way of stacking
Dress is connected by connecting rod with nut between fixed plate (3) and the side form unit (21) of topmost.In the embodiment of this structure
In, side form unit can be provided with using the lower part that locating rod (22) is mounted on to side form unit (21), side plate connecting hole (212)
(21) top；Locating rod (22) can also be mounted on to the top of side form unit (21), side plate connecting hole (212) is provided with side
The lower part of form unit (21), specific connection type are not just shown in the accompanying drawings.
As shown in figs. 7-9, loading hopper includes storing pipe (5), piston (6) and compression bar (7), the main structure of storing pipe (5)
For the hollow cylinder of upper and lower opening, the bottom of hollow cylinder is the taper cone barrel of upper and lower opening, and the bottom of taper cone barrel is discharging
Mouth (8), discharge port (8) are the hollow cylinder of upper and lower opening.Compression bar (7) is connect with piston (6), and the top of compression bar (7) is equipped with
Pressing plate (10).Piston (6) is arranged in storing pipe (5) and can slide up and down in storing pipe (5).The side wall of piston (6) is equipped with
Sealing ring (9).By pushing compression bar (7) to control material extrusion speed.
Position-limit mechanism includes wale piece (11) and positioning sleeve (12), and wale piece (11) is arranged in the two sides of discharge port (8),
And the bottom surface of wale piece (11) is concordant with the lower edge of discharge port (8), and wale piece (11) is equipped with graduation mark, for measuring
Spacing between material mouth (8) and the long side of U-shaped side plate (211).Threaded hole (13), positioning sleeve are offered on positioning sleeve (12)
(12) it covers on wale piece (11), and fixed by bolt (14).Threaded hole is screwed in by adjusting bolt (14) when cloth
(13) depth makes two section wale pieces (11) on same straight line, to guarantee loading hopper in cloth along U-shaped side plate
(211) a line movement.
As shown in Figure 10, when making test specimen using 3D printing concrete sample molding machine of the invention, wale piece (11)
It is erected between the long side of U-shaped side plate (211) of single layer side form unit (21).Loading hopper along U-shaped side plate (211) long side side
To movement.
Using above-mentioned 3D printing concrete sample molding machine production test specimen method the following steps are included:
Step 1: brushing release agent on the side form unit (21) of bed die (1) and first layer is installed bed die (1) and first
The side form unit (21) of layer forms first layer cavity；
Step 2: prepared concrete is injected in loading hopper；
Step 3: squeezing out a small amount of concrete, and the concrete squeezed out is struck off with floating rule, loading hopper is placed on
On one layer of side form unit (21), cloth direction is determined by adjusting the position of positioning sleeve (12) on wale piece (11), it will
Concrete is fed into first layer cavity according to the path and width of setting；
Step 4: the side form unit (21) of the second layer is overlayed on the side form unit (21) of first layer；
Step 5: repeating step 2 to three, concrete is fed into the cavity of upper layer according to the path and width of setting；
Step 6: repeat step 4 to five, by the cavity on concrete injection upper layer, until filling concrete is to setting layer
Number；
Step 7: concrete sample maintenance is finally removed mold to age is set.
Embodiment one
Using 3D printing concrete formation device of the present invention make compression strength test, sample dimensions be 70mm × 70mm ×
70mm, 100mm × 100mm × 100mm, 150mm × 150mm × 150mm or 200mm × 200mm × 200mm, die trial bottom plate, pad
Plate, side plate are steel, cast iron or plastics.It is below 100mm × 100mm × 100mm 3D printing concrete sample with sample dimensions
It is illustrated for molding machine.
In 3D printing concrete sample molding machine the U-shaped side plate (211) of single layer with a thickness of 1cm, need points 10 layers into
Row perfusion.The diameter of discharge port (8) is 3cm, and material extrusion width is 5cm.Single layer cloth material tube diameter is in U-shape.Specific distributing method are as follows: bottom
Brushing release agent on the side form unit (21) of mould (1) and first layer, installation mold, the side form unit of bed die (1) and first layer
(21) first layer cavity is formed between.Prepared concrete is injected in storing pipe (5), piston (6), sealing ring are installed
(9), compression bar (7) and pressing plate (10), piston (6) and compression bar (7) are fitted into storing pipe (5), and wale piece (11) is covered and is being discharged
Mouth (8) outside, guarantees that the bottom surface of wale piece (11) is concordant with the lower edge of discharge port (8).It pushes compression bar (7), squeezes out a little coagulation
Soil strikes off the concrete squeezed out with floating rule, prevents hole occur when injection concrete.Loading hopper is placed on first layer
On side form unit (21), wale piece (11) is placed in the long side of two U-shaped side plates (211), discharge port (8) and a U-shaped side
One short side of plate (211) contacts, and prevents gap occur between the concrete and side form unit (21) of injection.Adjust positioning sleeve
(12), make the horizontal space 2.5cm between the center of discharge port (8) and the long side inner wall of U-shaped side plate (211), then will determine
Position cutting ferrule (12) is fixed.It pushes compression bar (7), while pushing wale piece (11), make loading hopper along the long side side of U-shaped side plate (211)
To movement, making cloth width is about 5.3cm.Another short side of the concrete being perfused and U-shaped side plate (211) stops when contacting
Material extrusion adjusts positioning sleeve (12), makes the water between the center of discharge port (8) and the long side inner wall of another U-shaped side plate (211)
Flat spacing is 2.5cm, then that positioning sleeve (12) are fixed.It pushes compression bar (7), while pushing wale piece (11), make loading hopper
Longitudinal direction along another U-shaped side plate (211) is mobile, and making cloth width is about 5cm.Concrete and another U-shaped side plate
(211) another short side stops material extrusion when contacting.Concrete extra in mold is struck off with floating rule after the completion of material extrusion.It should
Illustrate, twice the not necessarily above-mentioned value of the width of cloth, it is only necessary to there is overlapping between the concrete of cloth twice just, from
And guarantee that concrete fills up mold, prevent gap.
After first layer cavity fills up, the U-shaped side plate (211) on upper layer is placed on the U-shaped side plate (211) of first layer, weight
Multiple aforesaid operations, until by 10 layer concretes all injection mold.After concrete reaches some strength, mold is removed, is taken
Concrete sample out, maintenance to 28 day age.
In order to compare the effect of 3D printing concrete sample molding machine and forming method of the invention, using 3D printer
3D printing concrete contrast specimen is made, 3D printer discharge port diameter is 3cm, single layer print span 5.3cm, single layer printing height
Spend 1cm, test piece maintenance mode makes that test specimen is identical, and natural curing was to 25 days, using accurate cutting equipment by test block with the present invention
It is cut into the square test block of outer dimension 10cm, continues to test compression strength when maintenance to 28 day age.It in addition will be with cooperation
The 3D printing concreting of ratio to normal concrete die trial, plugged and pounded it is closely knit after natural curing to 28 day age when with the present invention
Institute's shaping test piece carries out intensity test simultaneously.Test result is as shown in table 1.
1 concrete crushing strength test result (MPa) of table
Three kinds of molding modes respectively make 9 pieces of compression strength test blocks, and table 1 is intensity test knot after test block maintenance 28 days
Fruit.As can be seen from the table, common die trial, which pours, plugs and pounds molding test block pressure resistance intensity test result fluctuation minimum, 3D printing molding
The fluctuation of+excision forming mode test block pressure resistance intensity test result is maximum, and wherein test block 3 and 7 test result of test block exceed pressure resistance
The 15% of average value is spent, asks the average value of remaining test block as the average value of the molding mode compression strength.Present invention molding side
Formula compression strength average value is higher by 2.0% than 3D printer molding+excision forming mode, and common die trial pours and plugs and pounds molding mode
The compression strength measured is higher by 22.8% than molding mode of the present invention and 3D printer molding+cutting mode respectively and 25.3%.This
Illustrate due to moulding process difference, common die trial, which pours, to be plugged and pounded inside the concrete sample that molding mode makes with other two mode
Pore structure differs greatly, and the present invention and the moulding process of 3D printer molding mode are close, so compression strength is similar, by
There is mold when the present invention is in production, test specimen verticality and straightness are better than the molding test block of 3D printer, each test block pressure resistance
Degree fluctuation is much smaller than the latter.
Embodiment two
Test specimen is having a size of 70mm × 70mm × 70mm, 100mm × 100mm × 100mm, 150mm × 150mm in the present embodiment
× 150mm or 200mm × 200mm × 200mm, die trial bottom plate, backing plate, side plate are steel, cast iron or plastics.Below to use test specimen
Having a size of being illustrated for 100mm × 100mm × 100mm.
Mold single layer U-shaped side plate (211) with a thickness of 2cm, 5 layers need to be divided to be made.The diameter of discharge port (8) is 2cm,
Material extrusion width is 3.3cm, and the path of single layer cloth is S-shaped, i.e., loading hopper linear running 3 times can be U-shaped by concrete confluent monolayers
Mold.Practical material extrusion width is about 3.5cm, 3D printing formation of concrete test block production, maintenance and cutting step reference implementation example
One.It makes 3D printer simultaneously and forms+cut test block, print head discharge port diameter 2cm, material extrusion width about 3.5cm, production method
Reference implementation example one, wherein 3D printer forms+cuts test block material extrusion path and also uses S type path, i.e. production one-course concrete
It needs print head linear running 3 times.Two groups are tested after test piece maintenance 28 days, and are poured with common die trial and plugged and pounded molding test knot
Fruit comparison, test result are as shown in table 2.
2 concrete crushing strength test result (MPa) of table
Three kinds of molding modes respectively make 9 pieces of compression strength test blocks, and table 2 is intensity test knot after test block maintenance 28 days
Fruit, as can be seen from the table, 3D printing molding+excision forming mode test block pressure resistance intensity test result fluctuation are maximum, pilot scale
2 test result of block exceeds the 15% of compression strength average value, asks the average value of remaining test block as the molding mode compression strength
Average value.Molding mode compression strength average value of the present invention is higher by 4.5% than 3D printer molding+excision forming mode, and general
Logical die trial, which pours, plugs and pounds compression strength that molding mode measures respectively than molding mode of the present invention and 3D printer molding+cutting side
Formula high 29.6% and 35.9%.For this explanation due to moulding process difference, common die trial, which pours, plugs and pounds molding mode and other two side
The concrete sample internal pore structure of formula production differs greatly, and the present invention and the moulding process of 3D printer molding mode connect
Closely, so compression strength is similar, since the present invention has a mold in production, test specimen verticality and straightness better than 3D printer at
The test block of type, each test block pressure resistance intensity fluctuation are much smaller than the latter.
Embodiment three
Test specimen, the present embodiment pilot scale are tested using 3D printing concrete sample molding machine production anti-freezing property of the invention
Part is steel, cast iron or plastics having a size of 400mm × 100mm × 100mm, die trial bottom plate, backing plate, side plate.
The U-shaped side plate (211) of single layer with a thickness of 1cm, the width of rectangular side panels in 3D printing concrete sample molding machine
Degree is 100mm, and the diameter of discharge port (8) is 3cm, and the path of single layer cloth is in U-shape, i.e., loading hopper linear running 2 times can be by list
Concrete is paved in layer rectangular side panels.Practical discharging width about 5.3cm, concrete sample make, maintenance and cutting step reference
Embodiment one.3D printer is made simultaneously forms+cut test block, print head discharge port diameter 3cm, material extrusion width about 5.3cm, system
Make mode reference implementation example one, wherein 3D printer forms+cuts test block material extrusion path and also uses U-shaped path, i.e. production single layer
Concrete needs print head linear running 2 times.Two groups are tested after test piece maintenance 28 days, and pour with common die trial and plug and pound molding
Test result comparison, test result are as shown in table 3.
3 concrete antifreezing performance test result of table
Table 3 is the molding concrete test block antifreezing test of three composing type modes as a result, as can be seen from the table, common coagulation
Soil pours that plug and pound two kinds of test block test result difference of molding test block and remaining very big, adopts test block frost resistance produced by this method
The practical anti-freezing property of 3D printing concrete can be reacted.The test block made of molding mode of the invention, by freeze thawing
After circulation, mass loss rate and Relative dynamic modulus of elasticity are similar to the result of test block of 3D printer molding cutting mode production, can be with
The test block substitution made of molding mode of the present invention tests frost resistance using the concrete test block of 3D printer moulding process preparation
Energy.
Compared with the prior art the shortcomings that and deficiency, the application provide a kind of 3D printing concrete sample molding machine and at
Type method had not only realized layer-by-layer printing and making, but also can guarantee the verticality of each adjacent surface and the planarization of surface of test piece；Pass through control
Loading hopper material extrusion speed keeps discharging width and design consistent；The application does not need to reduce test using concrete 3D printer
Expense, while avoiding the cutting of 3D printing concrete sample, polishing technique, improve test specimen mechanical property and endurance quality test
Precision, the performance test results are approached with using the molding test specimen of concrete 3D printer.
Above embodiment be only preferred embodiments of the present invention will be described, not to the scope of the present invention into
Row limits, and without departing from the spirit of the design of the present invention, those of ordinary skill in the art do technical solution of the present invention
Various changes and improvements out should all be fallen into the protection scope that claims of the present invention determines.
Claims (10)
1. a kind of 3D printing concrete sample molding machine, it is characterised in that including mold and loading hopper, the mold includes bottom
The four corners of mould (1), side form (2) and fixed plate (3), the bed die (1) are equipped with bed die connecting hole (101), the fixed plate
(3) it is arranged on side form (2), fixed plate (3) is equipped with fixed plate connecting hole (31), and the side form (2) includes side form unit
(21) and locating rod (22), each side form unit (21) are the rectangle template being put together by two U-shaped side plates (211), U-shaped side
The corner of plate (211) is vertically equipped with side plate connecting hole (212), and the locating rod (22) is arranged in side plate connecting hole (212),
And bed die (1), side form (2) and fixed plate (3) are connected；
The bottom of the loading hopper is equipped with position-limit mechanism, and the loading hopper is erected on side form (2) by position-limit mechanism.
2. a kind of 3D printing concrete sample molding machine according to claim 1, it is characterised in that: the side plate connection
Hole (212) is through-hole, and bed die connecting hole (101) are inserted into one end of the locating rod (22), and the other end passes through side plate connecting hole
(212) and fixed plate connecting hole (31) it, and then by bed die (1), side form (2) and fixed plate (3) connects.
3. a kind of 3D printing concrete sample molding machine according to claim 1, it is characterised in that: the side plate connection
Hole (212) is blind hole, and the locating rod (22) is connected between bed die connecting hole (101) and side plate connecting hole (212), sides adjacent
Between the side plate connecting hole (212) and side plate connecting hole (212) of form unit (21), side plate connecting hole (212) connects with fixed plate
Between hole (31), and then by bed die (1) and side form unit (21), adjacent side form unit (21), side form unit (21) and fixed
Plate (3) connection.
4. a kind of 3D printing concrete sample molding machine according to claim 2 or 3, it is characterised in that: the mold
It further include backing plate (4), bottom of backing plate (4) setting in bed die (1).
5. a kind of 3D printing concrete sample molding machine according to claim 1, it is characterised in that: the loading hopper packet
Storing pipe (5), piston (6) and compression bar (7) are included, the bottom of the storing pipe (5) is equipped with discharge port (8), the compression bar (7) and work
(6) connection is filled in, the piston (6) is arranged in storing pipe (5) and can slide up and down in storing pipe (5).
6. a kind of 3D printing concrete sample molding machine according to claim 5, it is characterised in that: the piston (6)
Side wall be equipped with sealing ring (9).
7. a kind of 3D printing concrete sample molding machine according to claim 6, it is characterised in that: the position-limit mechanism
Including wale piece (11) and positioning sleeve (12), the wale piece (11) is arranged in the two sides of discharge port (8), and wale piece
(11) bottom surface is concordant with the lower edge of discharge port (8), and wale piece (11) is equipped with graduation mark, opens on the positioning sleeve (12)
Equipped with threaded hole (13), positioning sleeve (12) covers on wale piece (11), and fixed by bolt (14).
8. a kind of 3D printing concrete sample forming method forms dress using 3D printing concrete sample described in claim 1
Set realization, it is characterised in that include the following steps,
Step 1: by brushing release agent on the side form unit (21) of bed die (1) and first layer, bed die (1) and first layer are installed
Side form unit (21) forms first layer cavity；
Step 2: prepared concrete is injected in loading hopper；
Step 3: loading hopper is placed on the side form unit (21) of first layer, cloth side is adjusted by regulation position limiting mechanism
To concrete is fed into first layer cavity according to the path and width of setting；
Step 4: the side form unit (21) of the second layer is overlayed on the side form unit (21) of first layer；
Step 5: repeating step 2 to three, concrete is fed into the cavity of upper layer according to the path and width of setting；
Step 6: repeat step 4 to five, by the cavity on concrete injection upper layer, until filling concrete is to setting the number of plies；
Step 7: concrete sample maintenance is finally removed mold to age is set.
9. a kind of 3D printing concrete sample forming method according to claim 8, it is characterised in that: the position-limit mechanism
Including wale piece (11) and positioning sleeve (12), the wale piece (11) is arranged in the two sides of discharge port (8), and wale piece
(11) bottom surface is concordant with the lower edge of discharge port (8), and wale piece (11) is equipped with graduation mark, opens on the positioning sleeve (12)
Equipped with threaded hole (13), positioning sleeve (12) covers on wale piece (11), and fixed by bolt (14)；In the step 3
Screw-in depth by adjusting bolt (14) makes two wale pieces (11) on the same line.
10. a kind of 3D printing concrete sample forming method according to claim 8, it is characterised in that: the step 3
A small amount of concrete is squeezed out before, and is struck off the concrete squeezed out with floating rule.
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Address after: 100029 building 3, yard 5, Anding Road, Chaoyang District, Beijing Patentee after: CHINA STATE CONSTRUCTION ENGINEERING Corp.,Ltd. Patentee after: China Construction Engineering Industry Technology Research Institute Co.,Ltd. Address before: 100029 building 3, yard 5, Anding Road, Chaoyang District, Beijing Patentee before: CHINA STATE CONSTRUCTION ENGINEERING Corp.,Ltd. Patentee before: CHINA STATE CONSTRUCTION ACADEMY Corp.,Ltd. |