CN104389832B - A kind of rotary digital valve and the spraying system of 3D printing device - Google Patents
A kind of rotary digital valve and the spraying system of 3D printing device Download PDFInfo
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- CN104389832B CN104389832B CN201410628455.8A CN201410628455A CN104389832B CN 104389832 B CN104389832 B CN 104389832B CN 201410628455 A CN201410628455 A CN 201410628455A CN 104389832 B CN104389832 B CN 104389832B
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- spool
- groove array
- resorption
- holding groove
- hole
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/078—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted and linearly movable closure members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Sliding Valves (AREA)
- Multiple-Way Valves (AREA)
Abstract
The present invention provides a kind of rotary digital valve, including valve pocket, left spool and right spool；Move axially about left spool and right spool energy and synchronous rotary be arranged on inside valve pocket；Left charging hole, right charging hole is had on valve pocket；The circumferential surface of left spool is provided with the left holding groove array of periodic distribution, and left holding groove array connects left feeder channel；The circumferential surface of described right spool is provided with the right holding groove array of periodic distribution, and right holding groove array connects right feeder channel；The ratio output of left side feed and the right feed depends on the mechanical dutycycle that left spool and the axial moving displacement of right spool are formed；The switching frequency of rotary digital valve is equal to the rotating speed of left spool and right spool synchronous rotary and the product of the groove number in left holding groove array or right holding groove array.The rotary digital valve of the present invention, is exported by the ratio of the quick on-off of rotary spool with double spool, can realize high frequency sound, accurate feeding, can apply to 3D printing device.
Description
Technical field
The present invention relates to the digital valve for rapid shaping, particularly relates to a kind of for composite
The accurate rotary digital valve that 3D prints.
Background technology
3D based on droplet jet printing is one of rapid shaping technique of most vitality, passes through material
The mode successively added breaches complex parts and manufactures the bottleneck of difficulty, and production efficiency is greatly improved.?
In monolayer print procedure, in printhead working chamber, fluent material forms liquid under the effect of external motivating force
Drip, and be ejected into relevant position with certain frequency and speed.Therefore, microdroplet stably, accurately and quickly
Injection is to ensure that the key of 3D print quality.
Current 3D printing technique is mainly studied and is printed round its high efficiency, accuracy and composite
Etc. aspect launch.
(1) in terms of efficient printing: use valve-regulated spray regime (such as U.S. patent Nos
US005988807A), bigger injection flow can be obtained relative to piezoelectric type and hot bubble type；Or
Use support liquid mode (such as Chinese invention patent 200510029726.9), save beating of backing material
Print process is to improve production efficiency.
(2) in terms of precise Printing: mainly by closed loop control method, mechanism is walked in print line and mend
Repay (such as Chinese invention patent 201410122566.1), it is achieved accurately controlling to improve spray of walking movement
Penetrate the degree of accuracy of position, and then promote 3D printing precision.
(3) in terms of composite printing: mainly by many feed units respectively with respective shower nozzle phase
Even (such as Chinese invention patent 201310339204.3) is to realize many shower nozzles individual injection, or by shower nozzle
It is separated into separate chamber and the mixing chamber that communicates with each chamber (such as Chinese invention patent
201410010519.8), multiple color material realizes colour print by being mutually mixed.
Existing patent contributes to the efficient precise Printing of composite, but still suffers from following some shortcomings,
Mainly show themselves in that
1) printing effect is the most not enough, constrains the further large-scale promotion that 3D prints.Current 3D
Printing the form mainly using single nozzle printing, print speed is slow, and printed material is single；And spray more
Head prints and the most gradually grows up, and increases print span to a certain extent, can realize one way multilamellar and print,
This improves printing effect, but many nozzle printings typically require multiple motor and control element etc., causes beating
Print body amasss bigger than normal, relatively costly.
2) injection of many synchronous material ratio realizes difficulty, and end properties is poor.3D rapid shaping technique is multiple
Condensation material molding provides a kind of new method, for pursuing high-quality composite products, accurate proportioning pole
It is important.But, current generally use separate multiple shower nozzles to carry out jet printing, quick long time
Between the lower synchronicity that works be difficult to ensure that, it is uneven that this will cause exporting material proportion, finally affect quality of item.
3) precision of printed product needs to be further improved.The quality of 3D printed product depends on uniformly,
Stable droplet jet, and in print procedure, it is commonly present main droplet and secondary drop.Position due to secondary drop
Put wayward, product printing precision can be brought adverse effect, simultaneously the drop water clock between twice injection
It is low that problem will also result in printing precision equally, causes product surface coarse.
Summary of the invention
One of the technical problem to be solved in the present invention, is to provide a kind of rotary digital valve, by rotating
The quick on-off of formula spool and the ratio output of double spool, can realize high frequency sound, accurate feeding.
One of the technical problem to be solved in the present invention is achieved in that a kind of rotary digital valve, including
Valve pocket, left spool and right spool；Described left spool and right spool can move left and right and synchronous rotary install
Inside valve pocket；Left charging hole, right charging hole is had on described valve pocket；The circumferential surface of described left spool
It is provided with the left holding groove array of periodic distribution, and left holding groove array connects left feeder channel；The described right side
The circumferential surface of spool is provided with the right holding groove array of periodic distribution, and right holding groove array connects right confession
Material passage；Described left spool has a following two states during being axially moveable: the most described left undertaking
The state that groove array axially docks with left charging hole and connects, or described left holding groove array and left charging hole
Axially offset disconnected state, and described left holding groove array and left charging hole are at axial docking location
Determine the size of left side feed；Described right spool also has following two kinds of shapes during being axially moveable
State: the state that the most described right holding groove array axially docks with right charging hole and connects, or described right undertaking
Groove array and right charging hole axially offset disconnected state, and described right holding groove array and right charging hole
The size of feed on the right of axial docking location determines；When described left holding groove array and left charging hole
When axially docking, there is during described left Spool rotating described left holding groove array and left charging hole circle
Circumferential abutment and connect and do not connect two states be alternately present with staggering；When described right holding groove array is with right
When charging hole axially docks, there is during described right Spool rotating described right holding groove array and enter with the right side
Material hole circle circumferential abutment and connect and do not connect two states be alternately present with staggering；Described left side feed and the right side
The ratio output of limit feed depends on the mechanical duty that left spool and the axial moving displacement of right spool are formed
Ratio；The switching frequency of described rotary digital valve is equal to the rotating speed of left spool and right spool synchronous rotary with left
The product of the groove number in holding groove array or right holding groove array.
Further, described valve pocket also has left resorption hole and right resorption hole, the circumference of described left spool
Surface is additionally provided with the left resorption groove array of periodic distribution, and left resorption groove array connects described left feed and leads to
Road；The circumferential surface of described right spool is provided with the right resorption access slot array of periodic distribution, and right resorption groove
Array connects described right feeder channel；When described left holding groove array connects with left charging hole, a described left side
Resorption groove array does not connects with left resorption hole, when described right holding groove array connects with right charging hole, right
Resorption groove array does not connects with right resorption hole；Otherwise, when described left holding groove array does not connects with left charging hole
Time logical, described left resorption groove array connects with left resorption hole, when described right holding groove array and right charging hole
When not connecting, described right resorption groove array connects with right resorption hole；The left end of described left spool, right spool
Right-hand member and left spool and right spool between form a control chamber respectively, arbitrary described control chamber is all connected with one
Electromagnetic proportional valve moves axially state with control left spool and right spool.
Further, described left charging hole, left resorption hole, right charging hole, right resorption hole are at described valve pocket
On arrange the most successively, and correspondence, described left holding groove array, left resorption groove array,
Right holding groove array and right resorption groove array are arranged the most successively；Described left feeder channel is positioned at a left side
Between holding groove array and left resorption groove array, right feeder channel is positioned at right holding groove array and right resorption groove
Between array.
Further, described left charging hole, right charging hole, left resorption hole and right resorption hole are diamond hole,
And acute angle axially left and right distribution in the two of diamond hole；Described left holding groove array, left resorption groove array, the right side
Groove in holding groove array and right resorption groove array is isosceles triangle groove, and left holding groove array and the right side
In holding groove array, the drift angle of each groove is towards each in left layout, left resorption groove array and right resorption groove array
The drift angle of groove is towards right layout；The drift angle of described isosceles triangle is equal with the interior acute angle of diamond hole；The described right side
When spool is at the maximum displacement moved right, the outer dead centre of right charging hole and the outer top of right holding groove array
Axial distance value h1 between point is equal with the long-diagonal distance value h2 of right charging hole.
Further, described left charging hole, right charging hole, left resorption hole and the size in right resorption hole and shape
Shape is consistent, described left holding groove array, left resorption groove array, right holding groove array and right resorption groove battle array
Groove consistent with shape sized by groove in row.
Further, described left holding groove array, left resorption groove array, right holding groove array and right time
In bothrium array, the number of groove is 3～10.
Further, described left spool left end convex shoulder offers cannelure, the most left spool has axle
To through hole, this cannelure and this axially extending bore formed hydraulic fluid channel, described left spool and right spool it
Between control chamber by this hydraulic fluid channel connect described electromagnetic proportional valve.
Further, displacement transducer and limit switch are also included；Institute's displacement sensors is by a survey
Bar is connected to the left end of left spool, and to measure the distance that moves axially of left spool, described limit switch is pacified
It is contained at the dextrad maximum displacement of right spool.
Further, the left end of described right spool is plugged in the right-hand member of left spool, and described right spool and
Left spool is by bonded and realized synchronous rotary by driven by motor.
The two of the technical problem to be solved in the present invention, are to provide the spraying system of a kind of 3D printing device,
The rotary digital valve of the application of the invention, it is achieved quick on-off exports with the ratio of double spool, with reality
The existing high frequency sound of 3D printing device, the accurate droplet jet of composite.
The two of the technical problem to be solved in the present invention are achieved in that the injection of a kind of 3D printing device
System, including two feed branches and two printing heads, also includes rotary digital the most of the present invention
Valve, described two feed branches connect the left charging hole of described rotary digital valve and right charging hole, institute respectively
Left feeder channel and the right feeder channel of stating rotary digital valve connect printing head described in respectively.
Further, the spraying system of the 3D printing device of the present invention also includes two negative pressure devices, described
Left resorption hole and the right resorption hole of rotary digital valve connect a negative pressure device, and the liquid of negative pressure device respectively
Face height is less than the minimum level height in coupled logical printing head.
The invention have the advantages that:
1) the double spool linkage rotation of the digital valve of the present invention being driven by single motor, printing effect
It is obviously improved.Having left and right charging hole on valve pocket, spool convex shoulder position, left and right two has periodic distribution
Left and right holding groove array, with left and right two valve core rotation, this left and right charging hole and left and right undertaking
Groove array period quick on-off, to realize the left and right existing periodic quick on-off of feeder channel, thus real
Existing high frequency response, if being connected with double shower nozzles of 3D printing device, can realize the altofrequency of composite
Output, thus effectively promote printing effect.
2) left and right two spools move axially independent control, the precise synchronization ratio of bi-material can be realized
Injection, end properties is good.About this valve, two spools control two shower nozzle outputs, respectively in conjunction with displacement sensing
Device is monitored, it is achieved being synchronized with the movement or the accurate closed loop control of single valve core movement of two spools, thus ensures
Many material proportions export, and synchronicity is good, is particularly suited for composite (especially coloured prod)
3D printing shaping.
3) also having left resorption hole and right resorption hole on valve pocket, the circumferential surface of left and right two spool is additionally provided with
The left and right resorption groove array of periodic distribution, forms linkage wicking structure, effectively inhibit secondary drop and
The formation of other unnecessary injections, printing precision is high.In liquid drop jetting process, set negative pressure dress
Put the fracture energy that can strengthen drop, prevent the generation of secondary drop, simultaneously between twice injection, negative pressure
Effect makes the liquid resorption a little in shower nozzle, it is to avoid liquid drips because of gravity, thereby ensures that equal
Even stable droplet jet, improves product quality.
Accompanying drawing explanation
The present invention is further illustrated the most in conjunction with the embodiments.
Fig. 1 is the internal structure schematic diagram of rotary digital valve one of the present invention preferred embodiment.
Fig. 2 is rotary digital valve of the present invention lower the opened triangular groove of left spool duty and rhombus on valve pocket
The location diagram in hole.
Fig. 3 is rotary digital valve of the present invention lower the opened triangular groove of right valve core reset state and rhombus on valve pocket
The location diagram in hole.
Fig. 4 is that rotary digital valve of the present invention controls two spool axially-movable simplified schematic diagram.
Fig. 5 a to Fig. 5 c is two spool axially-movable simplified schematic diagram of rotary digital valve of the present invention.
Fig. 6 a to Fig. 6 c characterizes two valve core reset motion simplified schematic diagram of rotary digital valve of the present invention.
Fig. 7 is that 3D based on the present invention prints spraying system schematic diagram.
Fig. 8 characterizes present invention operation principle schematic diagram in the state of a spray.
Fig. 9 characterizes present invention operation principle schematic diagram under resorption state.
Detailed description of the invention
As shown in Figures 1 to 6, rotary digital valve 100 1 preferred embodiment of the present invention, including valve
Set 1, left spool 2 and right spool 3, also include valve body 4, valve gap 5, displacement transducer 6 and spacing
Switch 7；Described left spool 2 and right spool 3 can move left and right and synchronous rotary be arranged in valve pocket 1
Portion；Wherein, the left end of described right spool 3 is plugged in the right-hand member of left spool 2, and described right spool 3
Pass through bonded with left spool 2 and realized synchronous rotary by motor shaft 82 by motor 8 drive.Described
Valve gap 5 is located at the right-hand member of valve body 4, and described valve pocket 1 is located in valve body 4, on described valve pocket 1 vertically
Have left charging hole 11, left resorption hole 12, right charging hole 13 and right resorption hole 14 the most successively；
The circumferential surface of described left spool 2 is provided with the left holding groove array 21 of periodic distribution, left resorption groove battle array
Row 22, and left holding groove array 21 connects left feeder channel 23 with resorption groove array 22；Described right valve
The circumferential surface of core 3 is provided with the right holding groove array 31 of periodic distribution and right resorption groove array 32, and
Right holding groove array 31 and right resorption groove array 32 connect right feeder channel 33；Described left feeder channel
23 between left holding groove array 21 and left resorption groove array 22, and right feeder channel 33 is positioned at the right side and holds
Between access slot array 31 and right resorption groove array 32；During design, can be by left holding groove array 21 and a left side
Resorption groove array 22 is located at two convex shoulder parts of left spool 2, and left feeder channel 23 then can be by two convex shoulders
/ thin portion self-assembling formation, right feeder channel 33 in like manner can obtain.On described valve body 4 vertically by
Left-to-right has left charging aperture 41, left resorption mouth 42, right charging aperture 43,44 points of right resorption mouth successively
Do not dock with described left charging hole 11, left resorption hole 12, right charging hole 13, right resorption hole 14.Institute
Displacement sensors 6 is connected to the left end of left spool 2 by a reference test bar 62, to measure left spool 2
Move axially distance, described limit switch 7 is arranged at the dextrad maximum displacement of right spool 3, maximum
The inner face of valve pocket end cap 15 it is usually at displacement.
Described left spool 2 has a following two states during being axially moveable: the most described left holding groove
The state that array 21 axially docks with left charging hole 11 and connects, or described left holding groove array 21 with
Left charging hole 11 axially offsets disconnected state, and described left holding groove array 21 and left charging hole
11 determine the size of left side feed at axial docking location；The mistake that described right spool 3 is axially moveable
Journey also has following two states: the most described right holding groove array 31 axially docks with right charging hole 13
And the state connected, or described right holding groove array 31 axially offsets disconnected shape with right charging hole 13
State, and described right holding groove array 31 and right charging hole 13 feed on the right of axial docking location determines
Size.
When described left holding groove array 21 axially docks with left charging hole 11, described left spool 2 rotates
During there is described left holding groove array 21 and left charging hole 11 circle circumferential abutment and connect and stagger
Do not connect two states to be alternately present；When described right holding groove array 31 axially docks with right charging hole 13
Time, described right spool 3 has described right holding groove array 31 and right charging hole 13 during rotating
Circle circumferential abutment and connect and do not connect two states be alternately present with staggering；Described left side feed and the right supply
The ratio output of material depends on the mechanical duty that left spool 2 and right spool 3 axially-movable displacement are formed
Ratio；The switching frequency of described rotary digital valve 100 is equal to left spool 2 and right spool 3 synchronous rotary
The product of the groove number in rotating speed and left holding groove array 21 or right holding groove array 31.
When described left holding groove array 21 connects with left charging hole 11, described left resorption groove array 22
Do not connect with left resorption hole 12, when described right holding groove array 31 connects with right charging hole 13, right
Resorption groove array 32 does not connects with right resorption hole 14；Otherwise, when described left holding groove array 21 is with left
When charging hole 11 does not connects, described left resorption groove array 22 connects with left resorption hole 12, when the described right side
When holding groove array 31 does not connects with right charging hole 13, described right resorption groove array 32 and right resorption hole
14 connections.To meet rotary digital valve 100 (i.e. feed state) not resorption in working order, make
Can normally work, and in the demand of off working state (during as resetted) resorption, make two outlets 101 (102)
No drip type.
In the embodiment in relatively happy festival time, described left charging hole 11, right charging hole 13, left resorption hole 12 and
Diamond hole the most consistent with shape sized by right resorption hole 14, and the axial left and right of acute angle in the two of diamond hole
Distribution；Described left holding groove array 21, left resorption groove array 22, right holding groove array 31 and right time
Isosceles triangle groove the most consistent with shape sized by groove in bothrium array 32, and left holding groove array
21 and right holding groove array 31 in the drift angle of each groove towards left layout, left resorption groove array 22 and right return
In bothrium array 32, the drift angle of each groove is towards right layout；The drift angle of described isosceles triangle and diamond hole
Interior acute angle is equal；When described right spool 3 is at the maximum displacement moved right, outside right charging hole 13
Axial distance value h1 between the outer dead centre of summit and right holding groove array 31, with the length of right charging hole 13
Diagonal distance value h2 is equal.
Described left holding groove array 21, left resorption groove array 22, right holding groove array 31 and right resorption
In groove array 32, the number of groove is 3～10.
The most left charging hole 11, left resorption hole 12 respectively with left holding groove array 21, left resorption groove array
The situations of 22 connections are concrete as in figure 2 it is shown, by the left holding groove array 21 on left spool 2 and left resorption
Convex shoulder corresponding to groove array 22 partially circumferentially launches；By left charging hole 11 and return with a left side simultaneously
Sucker 12, projects in the expanded view of left holding groove array 21 and left resorption groove array 22 respectively.Left
In holding groove array 21 and left resorption groove array 22, the size and shape of each triangular groove is completely the same, but
The position opened is different；Thus can realize when left charging hole 11 connects with left holding groove array 21, left
Resorption hole 12 is off with left resorption groove array 22, and in conjunction with Fig. 1, this avoids left charging aperture
The liquid of 41 inputs directly detaches through negative pressure device from left resorption mouth 42, and vice versa.The present invention rotates
The switching frequency of formula digital valve 100, equal to the triangular groove of motor 8 rotating speed with left holding groove array 21
The product of number, therefore can make rotary digital valve 100 by increasing motor speed and triangular groove number
Obtain higher switching frequency.
As Fig. 3 characterize be right spool 3 be in reset state time, the right charging hole that valve pocket 1 is opened
13 and right resorption hole 14, with right spool 3 on the right holding groove array 31 offered and right resorption groove array
The position relationship of 32.For accurately controlling dutycycle and the resorption requirement realized under reset state, right undertaking
The triangular groove apex angle α 1 of groove array 31 and the interior sharp angle α 2 of right charging hole 13 projection parallelogram
Equal, the triangular groove top of left holding groove array 21 is to the axial distance value of the outer dead centre of left charging hole 11
H1 is equal with the long-diagonal h2 of left charging hole 11.Simultaneously as the rightest spool 22 is in multiple
Position state, i.e. limit on the right-right-hand limit position, right charging hole 13 does not connects with right holding groove array 31, and liquid is the most defeated
Entering, do not spray, machinery dutycycle is 0%.Meanwhile, right resorption hole 14 is positioned at right returning
The high order end of bothrium array 32, at left spool 2 rotation status bottom right resorption hole 14 and right resorption groove array
32 are in connected state, so by negative pressure device resorption material, dropping liquid phenomenon can will not occur.
What Fig. 4 characterized is the schematic diagram controlling spool axially-movable of the present invention.Rotary digital valve 100
Left spool 2 and right spool 3 are connected by key A.In conjunction with Fig. 1, motor 8 drives right spool 3 to rotate,
And right spool 3 drives left spool 2 to rotate further through key A, thus ensure left spool 2 and right spool 3
Synchronous rotary.So, the ratio output of 100 liang of rotary digital valve outlet 101 and 102 depends on
In the mechanical dutycycle that left spool 2 and right spool 3 axially-movable displacement are formed.
For realizing the output of accurate ratio, left end, the right-hand member of right spool 3 and the left valve of described left spool 2
Forming a control chamber between core 2 and right spool 3 respectively, arbitrary described control chamber is all connected with a solenoid-operated proportional
Valve, to control moving axially of left spool 2 and right spool 3.Control chamber be respectively the first control chamber B1,
Second controls chamber B2 and the 3rd controls chamber B3, electromagnetic proportional valve include the first electromagnetic proportional valve 91, the
Two electromagnetic proportional valve 92 and the 3rd electromagnetic proportional valves 93, control the first control chamber B1, the second control respectively
Chamber B2 processed and the 3rd controls chamber B3.When the first electromagnetic proportional valve 91 left position work, the second electromagnetism ratio
Position work in example valve 92, the 3rd electromagnetic proportional valve 93 right position work；Liquid enters the first control chamber B1 to be pushed away
Dynamic right spool 3, toward left movement, now controls chamber B2 be in closed state, and liquid compression due to second
Property little, so can be thus real by the left spool of liquid-driving 2 in the second control chamber B2 toward left movement
The synchronization of existing right spool 3 and left spool 2 is toward left movement.When the second electromagnetic proportional valve 92 left position work,
Position work in 3rd electromagnetic proportional valve 93 right position work, the first electromagnetic proportional valve 92；Liquid enters the second control
Chamber B2 processed, the 3rd controls chamber B3 goes out liquid, owing to the first control chamber B1 is in closed state, now
Left spool 2 is individually toward left movement, and right spool 3 keeps static.When the 3rd 93 left works of electromagnetic proportional valve
When making, position work in the second electromagnetic proportional valve 62 right position work, the first electromagnetic proportional valve 32；Liquid enters
3rd controls chamber B3, and second controls chamber B2 returns liquid, owing to the first control chamber B1 is in closed state,
The most left spool 2 is individually turned right motion, and right spool 3 keeps static.
The kinestate that left spool 2 and right spool 3 move axially includes following three kinds of situations:
(1) such as Fig. 5 a, described left spool 2 and right spool 3 are an entirety, synchronously toward moving left x1,
Realize the output of equal proportion.During reset, keeping left spool 2 and right spool 3 is an entirety, turns right together
Motion x1；Such as Fig. 6 a, left spool 2 left end is connected with displacement transducer 6, therefore by reference test bar 62
Its position is detected by displacement transducer 6；
(2) such as Fig. 5 b, the most left spool 2 is synchronize with right spool 3 toward left movement x1, the rightest spool
3 keep static, and left spool 2 is individually toward moving left x2, it is achieved left feeder channel 23 and right feeder channel
The different proportion injection of 33；During reset, left spool 2 is turned right the distance of motion x1+x2, such as Fig. 6 b,
Its position is detected by displacement transducer 6, and right spool 3 is toward moving right x1, and its position is by limit switch 7
Detection；
(3) such as Fig. 5 c, the most left spool 2 is synchronize with right spool 3 toward left movement x1, the rightest spool
3 keep static, and left spool 2 is individually toward moving right x2, it is achieved left feeder channel 23 and right feeder channel
The different proportion output of 33；During reset, left spool 2 is turned right the distance of motion x1-x2, such as Fig. 6 c,
Its position is detected by displacement transducer 6, and right spool 3 is toward moving right x1, and its position is by limit switch 7
Detection.
Offer cannelure 24 on described left spool 2 left end convex shoulder, the most left spool 2 has axially
Through hole 25, the control chamber that is second between described left spool 2 and right spool 3 is controlled chamber B2 and is led to by this
Hole 25 connects that is second electromagnetic proportional valve 92 of electromagnetic proportional valve described in cannelure 24.
Fig. 7 schematically illustrates the rotary digital valve 7 of embodiment of the present invention and prints injection at 3D
Application in system.Primary Reference Fig. 7 to Fig. 9, in combination with Fig. 1 to Fig. 6, along with composite
Fast development, rapid shaping technique is to accelerate the exploitation of new product, the raising of manufacturing technology to serve very
Big impetus, the rotary digital valve 100 of the present invention has two delivery outlets 101 and 102, for
The composite molding of bi-material provides a kind of new scheme, it is achieved quick on-off is defeated with the ratio of double spool
Go out, to realize the accurate droplet jet of the high frequency sound of 3D printing device, composite.
The spraying system of this 3D printing device, including two feed branch 200 and two printing heads 300,
Also include two negative pressure devices 400, also include rotary digital valve 100 the most of the present invention, described
Feed branch 200 includes material cartridge 201, heater 202, pump 203, overflow valve 204, filter
205 and check valve 206.Described two feed branches 200 connect a left side for described rotary digital valve respectively
Charging hole 21 and right charging hole 31, the left resorption hole 22 of rotary digital valve 100 and right resorption hole 32
Connect a negative pressure device 400, the left feeder channel 23 of described rotary digital valve 100 and right confession respectively
Material passage 33 connects printing head 300 described in respectively.And the liquid level of negative pressure device 400 is less than
Minimum level height in coupled logical printing head.
In this spraying system work process, respectively bi-material is added first with heater 202
Heat so that it is meet injection conditions.When rotary digital valve 100 is in the work of left position, one of which material
Expect to enter rotation fitting type digital valve 100 after pump one feed branch 200, then from a printing head 300
Eject；Another kind of material branches into rotary digital valve 100 through another feed, then prints from another
Shower nozzle 300 ejects.When the right position of rotary digital valve 100 works, two printing heads 300 are respectively
Communicating with two negative pressure devices 400, under suction function, the fluent material in two printing heads 300 is formed
Resorption state a little, it is to avoid the weeping of liquid under action of gravity.Due to from printing head 300
The liquid ejected is discrete droplet-like, so for ease of analyzing, definition " dutycycle " is that liquid is defeated
Do well the ratio of output state non-with liquid, this parameter and Spool rotating speed, determines the speed of injection
Rate and frequency.
The spraying system spray regime that Fig. 8～9 characterizes 3D printing device of the present invention is former with resorption operation
Reason figure.In conjunction with Fig. 1, when being in spray regime, liquid is entered by the left charging aperture 41 on valve body 4,
And communicate with printing head 300 through the discharging opening 101 corresponding with left spool 2, the most left material sucking port 42
Close, be achieved in the injection of a kind of liquid.Meanwhile, the another kind of liquid right side from valve body 4 is entered
Material mouth 43 enters, and communicates with printing head 300 through the discharging opening 102 mouthfuls corresponding with right spool 3,
The rightest material sucking port 43 is closed, it is achieved the injection of another kind of liquid, i.e. completes discharging opening 101 and discharging
102 mouthfuls of mouth sprays simultaneously.After completing once to spray, enter resorption state, now, on valve body 4
Left charging aperture 41 and right charging aperture 43 are closed, and printing head 300 is through left material sucking port 42 and right material sucking port
It is connected with negative pressure device 400 after 43, the small size resorption of liquid in printing head 300, makes printing head
The small size resorption of liquid in 300, avoids liquid drip leakage with this, ready for spraying next time.
In the resorption state embodiment of Fig. 9, the liquid level of negative pressure device 400 is logical less than coupled
Minimum level height in printing head 300, the two liquid level difference is that h is adjustable, is derived from meeting difference
The resorption negative pressure value of injection demand.
Although the foregoing describing the detailed description of the invention of the present invention, but it is familiar with the technology people of the art
Member should be appreciated that our described specific embodiment is merely exemplary rather than for this
The restriction of bright scope, those of ordinary skill in the art are in the equivalence made according to the spirit of the present invention
Modify and change, all should contain in the scope of the claimed protection of the present invention.
Claims (10)
1. a rotary digital valve, it is characterised in that: include valve pocket, left spool and right spool；Institute
State move axially about left spool and right spool energy and synchronous rotary be arranged on inside valve pocket；
Left charging hole, right charging hole is had on described valve pocket；The circumferential surface of described left spool is provided with the cycle
Property distribution left holding groove array, and left holding groove array connect left feeder channel；The circle of described right spool
Perimeter surface is provided with the right holding groove array of periodic distribution, and right holding groove array connects right feeder channel；
Described left spool has a following two states during being axially moveable: the most described left holding groove battle array
The state that row axially dock with left charging hole and connect, or described left holding groove array is axial with left charging hole
Stagger disconnected state, and described left holding groove array determines at axial docking location with left charging hole
The size of left side feed；Described right spool also has following two states during being axially moveable: i.e.
The state that described right holding groove array axially docks with right charging hole and connects, or described right holding groove array
Axially offset disconnected state with right charging hole, and described right holding groove array and right charging hole are axially
Docking location determine on the right of the size of feed；
When described left holding groove array axially docks with left charging hole, during described left Spool rotating
There is described left holding groove array and left charging hole circle circumferential abutment and connect and stagger and do not connect two shapes
State is alternately present；When described right holding groove array axially docks with right charging hole, described right Spool rotating
During there is described right holding groove array and right charging hole circle circumferential abutment and connect and stagger and do not connect
Logical two states are alternately present；
The ratio output of described left side feed and the right feed depends on that left spool and right spool are axially transported
The mechanical dutycycle that dynamic displacement is formed；The switching frequency of described rotary digital valve is equal to left spool and right valve
The product of the groove number in the rotating speed of core synchronous rotary and left holding groove array or right holding groove array；
A control is formed respectively between the left end of described left spool, the right-hand member of right spool and left spool and right spool
Chamber processed, arbitrary described control chamber is all connected with an electromagnetic proportional valve to control the axial shifting of left spool and right spool
Dynamic state.
A kind of rotary digital valve the most according to claim 1, it is characterised in that: described valve pocket
On also have left resorption hole and right resorption hole, the circumferential surface of described left spool is additionally provided with periodic distribution
Left resorption groove array, and the left resorption groove array described left feeder channel of connection；The circumference table of described right spool
Face is provided with the right resorption access slot array of periodic distribution, and right resorption groove array connects described right feed and leads to
Road；
When described left holding groove array connects with left charging hole, described left resorption groove array and left resorption hole
Do not connect, when described right holding groove array connects with right charging hole, right resorption groove array and right resorption hole
Do not connect；Otherwise, when described left holding groove array does not connects with left charging hole, described left resorption groove battle array
Row connect with left resorption hole, when described right holding groove array does not connects with right charging hole, and described right resorption
Groove array connects with right resorption hole.
A kind of rotary digital valve the most according to claim 2, it is characterised in that: a described left side is entered
Material hole, left resorption hole, right charging hole, right resorption hole are arranged on described valve pocket the most successively
Cloth, and correspondence, described left holding groove array, left resorption groove array, right holding groove array and right time
Bothrium array is arranged the most successively；
Described left feeder channel between left holding groove array and left resorption groove array, right feeder channel position
Between right holding groove array and right resorption groove array；
Described left charging hole, right charging hole, left resorption hole and right resorption hole are diamond hole, and diamond hole
Acute angle axially left and right distribution in two；Described left holding groove array, left resorption groove array, right holding groove array
And the groove in right resorption groove array is isosceles triangle groove, and left holding groove array and right holding groove array
In the drift angle of each groove towards the drift angle court of each groove in left layout, left resorption groove array and right resorption groove array
Right layout；
The drift angle of described isosceles triangle is equal with the interior acute angle of diamond hole；
When described right spool is at the maximum displacement moved right, the outer dead centre of right charging hole and right holding groove
Axial distance value h1 between the outer dead centre of array is equal with the long-diagonal distance value h2 of right charging hole.
A kind of rotary digital valve the most according to claim 3, it is characterised in that: a described left side is entered
The size and shape in material hole, right charging hole, left resorption hole and right resorption hole is consistent, described left holding groove battle array
Sized by groove in row, left resorption groove array, right holding groove array and right resorption groove array and shape one
The groove caused.
5. according to a kind of rotary digital valve described in claim 3 or 4, it is characterised in that: described
The number of groove in left holding groove array, left resorption groove array, right holding groove array and right resorption groove array
It is 3～10.
A kind of rotary digital valve the most according to claim 1, it is characterised in that: described left valve
Offer cannelure on core left end convex shoulder, the most left spool has axially extending bore, this cannelure and this axle
Forming hydraulic fluid channel to through hole, the control chamber between described left spool and right spool is by this flow of pressurized
Electromagnetic proportional valve described in body channel connection.
A kind of rotary digital valve the most according to claim 1, it is characterised in that: also include position
Displacement sensor and limit switch；Institute's displacement sensors is connected to a left side for left spool by a reference test bar
End, to measure the distance that moves axially of left spool, the dextrad that described limit switch is arranged on right spool is maximum
At displacement.
A kind of rotary digital valve the most according to claim 1, it is characterised in that: described right valve
The left end of core is plugged in the right-hand member of left spool, and described right spool and left spool are by bonded and by electricity
Machine drives and realizes synchronous rotary.
9. a spraying system for 3D printing device, including two feed branches and two printing heads, its
It is characterised by: also including the rotary digital valve as described in any one of claim 1 to 8, described two supply
Material branch connects the left charging hole of described rotary digital valve and right charging hole, described rotary digital respectively
Left feeder channel and the right feeder channel of valve connect printing head described in respectively.
The spraying system of a kind of 3D printing device the most according to claim 9, it is characterised in that:
Also including two negative pressure devices, it is negative that the left resorption hole of described rotary digital valve and right resorption hole connect one respectively
Pressure device, and the liquid level of negative pressure device is high less than the minimum level in coupled logical printing head
Degree.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410628455.8A CN104389832B (en) | 2014-11-10 | 2014-11-10 | A kind of rotary digital valve and the spraying system of 3D printing device |
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| CN201410628455.8A CN104389832B (en) | 2014-11-10 | 2014-11-10 | A kind of rotary digital valve and the spraying system of 3D printing device |
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| CN104389832A CN104389832A (en) | 2015-03-04 |
| CN104389832B true CN104389832B (en) | 2016-09-28 |
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| TWI617428B (en) * | 2016-11-24 | 2018-03-11 | 財團法人國家實驗研究院 | Device and method for droplet generation |
| CN109822902A (en) * | 2019-04-07 | 2019-05-31 | 吉林大学 | Without support liquid phase mixing material 3D printing apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3835788A1 (en) * | 1988-10-20 | 1990-04-26 | Deutsche Forsch Luft Raumfahrt | QUICK-SWITCHING BALL VALVE |
| JPH0396776A (en) * | 1989-09-08 | 1991-04-22 | Kubota Corp | Driving mechanism of valve |
| JP3450980B2 (en) * | 1997-01-20 | 2003-09-29 | ジヤトコ株式会社 | Method and apparatus for controlling a duty cycle type solenoid valve |
| IL126845A (en) * | 1997-11-05 | 2001-10-31 | Saginomiya Seisakusho Inc | Rotary channel-selector valve |
| CN102797721B (en) * | 2012-08-19 | 2015-02-25 | 杭州宇控机电工程有限公司 | Direct-acting large-flow high-speed switching electromagnetic valve |
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