CN108638288A - One kind being suitable for the large size molding air pump drive-type feeding controllers of geological model 3D - Google Patents
One kind being suitable for the large size molding air pump drive-type feeding controllers of geological model 3D Download PDFInfo
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- CN108638288A CN108638288A CN201810383809.5A CN201810383809A CN108638288A CN 108638288 A CN108638288 A CN 108638288A CN 201810383809 A CN201810383809 A CN 201810383809A CN 108638288 A CN108638288 A CN 108638288A
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- valve
- driving
- feeding
- control valve
- rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
- B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
- B28B13/027—Feeding the moulding material in measured quantities from a container or silo by using a removable belt or conveyor transferring the moulding material to the moulding cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/0063—Control arrangements
- B28B17/0081—Process control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Materials Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Reciprocating Pumps (AREA)
Abstract
One kind being suitable for the large size molding air pump drive-type feeding controllers of geological model 3D, including air compressor machine, pneumatic control valve group, feeding control host, inlet control valve and discharging control valve；Feeding control host is divided into driving stage body and feeding grade body, is connected by adapter flange between two bodies；Piston is equipped in two bodies, two-piston is connected by piston rod, and piston rod packing runs through adapter flange；It is set on driving stage body there are two blow vent and corresponds to its rod chamber or rodless cavity respectively；Pneumatic control valve group is connected with two blow vents respectively by two snorkels；Air compressor machine is connected with pneumatic control valve group；Displacement sensor is equipped in driving stage body rod chamber, one end is connected with adapter flange, and the other end is connected with piston rod；Feeding grade body is equipped with the pressure balance air hole of its corresponding rod chamber, is equipped with the inlet port and outlet port of its corresponding rodless cavity；Inlet control valve is connected by feed pipe with feed inlet, and discharging control valve is connected by discharge nozzle with discharge port.
Description
Technical field
The invention belongs to large-scale three dimensional physical model preparing technical fields, being suitable for large-scale Geological Model more particularly to one kind
The molding air pump drive-type feeding controllers of type 3D.
Background technology
Nature rock mass engineering project digging process is simulated by physical experiments, is with predicting and forecast large-sized rock mass engineering
The important method of matter disaster.Geological model needs are made of Similar Material of Rockmass, and Similar Material of Rockmass is usually by cement, stone
The compositions such as cream, sand, iron powder and barite need first to stir evenly Similar Material of Rockmass, then before making geological model
The Similar Material of Rockmass being stirred supply 3D molding machines are used by pumping equipment.
Currently, the Similar Material of Rockmass being stirred mainly is conveyed by two kinds of pumping equipments, including it is spiral
Conveyer and plunger type conveyer.But existing two kinds of pumping equipments can not accurately control load, and load can
Tune ability is weak；After pumping work, pumping equipment is not easy to dismantle and clean.
Invention content
In view of the problems of the existing technology, the present invention provides a kind of suitable for the molding air pump drives of large-scale geological model 3D
Dynamic formula feeding controller can be used for replacing traditional screw conveyer and plunger type conveyer, can accurately volume control out
Doses, and the tunability of load is strong；After pumping work, feeding controller can be dismantled, more convenient cleaning.
To achieve the goals above, the present invention adopts the following technical scheme that：One kind being suitable for large-scale geological model 3D moldings
Air pump drive-type feeding controller, including air compressor machine, pneumatic control valve group, feeding control host, inlet control valve and discharging
Control valve；The feeding control host is divided into driving stage body and feeding grade body, between driving stage body and feeding grade body
It is fixedly connected with by adapter flange；Driving stage piston, driving stage piston and driving stage body are provided in the driving stage body
It is slidably matched for sealing；Feeding grade piston is provided in the feeding grade body, feeding grade piston is close with feeding grade body
Envelope is slidably matched；It is fixedly connected with by piston rod between the driving stage piston and feeding grade piston, piston rod packing is through switching
Flange, and linear bearing is added between piston rod and adapter flange；It is opened on the rod chamber shell of the driving stage body
Equipped with the first blow vent, the pneumatic control valve group is connected by the first snorkel with the first blow vent；In the driving stage
The second blow vent is offered on the rodless cavity shell of body, the pneumatic control valve group passes through the second snorkel and the second blow vent
It is connected；The air compressor machine is connected by high pressure gas pipeline with pneumatic control valve group；In the rod chamber of the driving stage body
It is inside provided with rod-pulling type displacement sensor, rod-pulling type displacement sensor is parallel with piston rod, rod-pulling type displacement sensor one end
It is fixed on adapter flange, the rod-pulling type displacement sensor other end is fixed on the piston rod by Change-over frame；In the feeding grade
Pressure balance air hole is offered on the rod chamber shell of body；It is opened up respectively on the rodless cavity shell of the feeding grade body
There are inlet port and outlet port；The inlet control valve is connected by feed pipe with feed inlet, and discharging control valve passes through discharge nozzle
It is connected with discharge port.
The pneumatic control valve group includes the first pressure regulator valve, first pressure valve, first row air valve, the second pressure regulator valve, second
Pressure valve and second row air valve；The inlet end of first pressure regulator valve is connected by high pressure gas pipeline with air compressor machine, the first pressure regulation
The outlet side of valve is connected by first pressure valve with the first snorkel all the way, and another way is connected by first row air valve with air
It is logical；The inlet end of second pressure regulator valve is connected by high pressure gas pipeline with air compressor machine, the outlet side a-road-through of the second pressure regulator valve
It crosses second pressure valve with the second snorkel to be connected, another way is connected by second row air valve with air.
First pressure regulator valve and the second pressure regulation valve arrangement are identical, include valve body, driving motor, driving gear and driven
Gear；The driving motor is packed on valve body, and the driving gear is fixedly set on the motor shaft of driving motor；It is described from
Moving gear is fixedly set on the spool body of rod of valve body, and driven gear is meshed with driving gear；Turned by driving motor output
Square drives driving gear and driven gear rotation, the aperture for adjusting valve body inner spool successively.
The inlet control valve is identical with discharging control valve structure, includes valve casing, hose, the bar that shuts off, steering engine, driving wheel
And driving spring；The hose is located at valve casing inside bottom, and hose both ends are respectively connected with switching nut；The steering engine is packed in valve
Shell top, driving wheel bias are packed on the motor shaft of steering engine；Described bar one end of shutting off abuts against contact outside the wheel disc of driving wheel
On all edges, the outer tube wall of shut off the bar other end and hose, which abuts against, to be engaged；The driving spring is located inside valve casing, driving
Spring is parallel with the bar that shuts off, and driving spring one end is connected on valve casing, and the driving spring other end passes through adapting rod and the bar that shuts off
It is fixedly connected with；The bar that shuts off is driven to move in a straight line by steering engine or driving spring, the unlatching for adjusting hose tube chamber and closure.
Beneficial effects of the present invention：
The present invention's is suitable for the large size molding air pump drive-type feeding controllers of geological model 3D, can be used for replacing tradition
Screw conveyer and plunger type conveyer, can accurate volume control load, and the tunability of load is strong；Work as pump
After sending work, feeding controller can be dismantled, more convenient cleaning.
Description of the drawings
Fig. 1 is the structural representation suitable for the large size molding air pump drive-type feeding controllers of geological model 3D of the present invention
Figure；
Fig. 2 is that the feeding of the present invention controls the structural schematic diagram of host；
Fig. 3 is the structural schematic diagram of the pneumatic control valve group of the present invention；
Fig. 4 be the present invention the first pressure regulator valve/second pressure regulator valve structural schematic diagram；
Fig. 5 is the structural schematic diagram of inlet control valve/discharging control valve of the present invention；
In figure, 1-air compressor machine, 2-pneumatic control valve groups, 3-feedings control host, 4-inlet control valves, 5-dischargings
Control valve, 6-driving stage bodies, 7-feeding grade bodies, 8-driving stage pistons, 9-feeding grade pistons, 10-piston rods,
11-linear bearings, the rod chamber of 12-driving stage bodies, the 13-the first blow vent, the 14-the first snorkel, 15-driving stages
The rodless cavity of body, the 16-the second blow vent, the 17-the second snorkel, 18-high pressure gas pipelines, 19-rod-pulling type displacement sensings
Device, 20-Change-over frames, the rod chamber of 21-feeding grade bodies, 22-pressure balance air holes, 23-feeding grade bodies without bar
Chamber, 24-feed inlets, 25-discharge ports, 26-feed pipes, 27-discharge nozzles, the 28-the first pressure regulator valve, 29-first pressure valves,
30-first row air valves, the 31-the second pressure regulator valve, 32-second pressure valves, 33-second row air valves, 34-valve bodies, 35-drivings
Motor, 36-driving gears, 37-driven gears, 38-valve casings, 39-hoses, 40-shut off bar, 41-steering engines, 42-drivings
Wheel, 43-driving springs, 44-switching nuts, 45-adapting rods, 46-adapter flanges, 47-quick couplings.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Fig. 1~5, one kind being suitable for the large size molding air pump drive-type feeding controllers of geological model 3D, including
Air compressor machine 1, pneumatic control valve group 2, feeding control host 3, inlet control valve 4 and discharging control valve 5；The feeding controls host
3 points are driving stage body 6 and feeding grade body 7, solid by 46 phase of adapter flange between driving stage body 6 and feeding grade body 7
Even；Driving stage piston 8 is provided in the driving stage body 6, driving stage piston 8 is that sealing sliding is matched with driving stage body 6
It closes；Feeding grade piston 9 is provided in the feeding grade body 7, feeding grade piston 9 is that sealing sliding is matched with feeding grade body 7
It closes；It is fixedly connected with by piston rod 10 between the driving stage piston 8 and feeding grade piston 9, the sealing of piston rod 10 runs through switching method
Orchid 46, and linear bearing 11 is added between piston rod 10 and adapter flange 46；In the rod chamber 12 of the driving stage body 6
The first blow vent 13 is offered on shell, the pneumatic control valve group 2 is connected by the first snorkel 14 with the first blow vent 13
It connects；The second blow vent 16 is offered on 15 shell of rodless cavity of the driving stage body 6, the pneumatic control valve group 2 passes through
Second snorkel 17 is connected with the second blow vent 16；The air compressor machine 1 passes through high pressure gas pipeline 18 and 2 phase of pneumatic control valve group
Connection；Rod-pulling type displacement sensor 19, rod-pulling type displacement sensor 19 are provided in the rod chamber 12 of the driving stage body 6
Parallel with piston rod 10,19 one end of rod-pulling type displacement sensor is fixed on adapter flange 46, rod-pulling type displacement sensor 19
The other end is fixed on by Change-over frame 20 on piston rod 10；Pressure is offered on 21 shell of rod chamber of the feeding grade body 7
Dynamic balance air hole 22；Feed inlet 24 and discharge port 25 are offered respectively on 23 shell of rodless cavity of the feeding grade body 7；
The inlet control valve 4 is connected by feed pipe 26 with feed inlet 24, and discharging control valve 5 passes through discharge nozzle 27 and discharge port 25
It is connected.
The pneumatic control valve group 2 includes the first pressure regulator valve 28, first pressure valve 29, first row air valve 30, the second pressure regulation
Valve 31, second pressure valve 32 and second row air valve 33；The inlet end of first pressure regulator valve 28 passes through high pressure gas pipeline 18 and sky
Press 1 is connected, and the outlet side of the first pressure regulator valve 28 is connected by first pressure valve 29 with the first snorkel 14 all the way, and another way is logical
First row air valve 30 is crossed with air to be connected；The inlet end of second pressure regulator valve 31 passes through high pressure gas pipeline 18 and air compressor machine 1
It is connected, the outlet side of the second pressure regulator valve 31 is connected by second pressure valve 32 with the second snorkel 17 all the way, and another way passes through the
Two air bleeding valves 33 are connected with air.
First pressure regulator valve 28 is identical with 31 structure of the second pressure regulator valve, includes valve body 34, driving motor 35, driving tooth
Wheel 36 and driven gear 37；The driving motor 35 is packed on valve body 34, and the driving gear 36 is fixedly set in driving electricity
On the motor shaft of machine 35；The driven gear 37 is fixedly set on the spool body of rod of valve body 34, driven gear 37 and driving tooth
Wheel 36 is meshed；By 35 output torque of driving motor, driving gear 36 and driven gear 37 is driven to rotate successively, for adjusting
The aperture of 34 inner spool of valve body.
The inlet control valve 4 is identical with 5 structure of discharging control valve, includes valve casing 38, hose 39, shut off bar 40, rudder
Machine 41, driving wheel 42 and driving spring 43；The hose 39 is located at 38 inside bottom of valve casing, and 39 both ends of hose are respectively connected with switching
Nut 44；The steering engine 41 is packed in 38 top of valve casing, and 42 bias of driving wheel is packed on the motor shaft of steering engine 41；It is described to shut off
40 one end of bar abuts against contact in the wheel disc outer periphery of driving wheel 42 along upper, shuts off 40 other end of bar and the outer tube wall of hose 39 abuts against
It is engaged；The driving spring 43 is located inside valve casing 38, and driving spring 43 is parallel with the bar 40 that shuts off, driving spring 43 1
End is connected on valve casing 38, and 43 other end of driving spring is fixedly connected with by adapting rod 45 and the bar 40 that shuts off；By steering engine 41 or drive
Spring 43 of moving drives the bar that shuts off to move in a straight line, the unlatching for adjusting 39 tube chamber of hose and closure.
Illustrate the application process of the present invention below in conjunction with the accompanying drawings：
Start the steering engine 41 of inlet control valve 4, drives 42 eccentric rotary of driving wheel, and make to cut under the effect of driving spring 43
Flow post 40 moves up, to make the tube chamber of hose 39 fully open；Meanwhile starting the steering engine 41 of discharging control valve 5, and then will
42 eccentric rotary of driving wheel is converted to the linear motion for the bar 40 that shuts off, so that the bar 40 that shuts off moves down, thus by hose 39
Tube chamber is closed completely.At this point, inlet control valve 4 is in open state, and discharging control valve 5 is closed.
Start air compressor machine 1, while opening the first pressure regulator valve 28, first pressure valve 29, second pressure valve 32 and second exhaust
Valve 33, and close first row air valve 30 and the second pressure regulator valve 31；The pressure-air that air compressor machine 1 exports at this time will pass sequentially through first
Pressure regulator valve 28, first pressure valve 29 and the first snorkel 14 enter in the rod chamber 12 of driving stage body 6, while driving stage body
Air in 6 rodless cavity 15 will pass sequentially through the second snorkel 17, second pressure valve 32 and second row air valve 33 and be discharged into air
In.
With the lasting gas supply of air compressor machine 1,12 pressure of rod chamber of driving stage body 6 gradually increases, and pushes driving stage
Piston 8 is moved to rodless cavity, and the displacement distance of driving stage piston 8 is directly measured by rod-pulling type displacement sensor 19 in real time.
With the movement of driving stage piston 8, synchronous drive piston rod 10 and feeding grade piston 9 are moved, and then make feeding
The rod chamber 21 of grade body 7 is compressed, and chamber air will be directly discharged by pressure balance air hole 22 in air, be sent simultaneously
Negative pressure will be presented in the rodless cavity 23 of material grade body 7, and under the action of negative pressure, analog material will be inhaled into the nothing of feeding grade body 7
In rod cavity 23, until rod-pulling type displacement sensor 19 monitor piston displacement distance reach setting value, close the first pressure regulation at this time
Valve 28, fill process terminates.
Next discharging process is executed, is first shut off inlet control valve 4, and open discharging control valve 5, while opening second
Pressure regulator valve 31 and first row air valve 30, simultaneously close off second row air valve 33；The pressure-air that air compressor machine 1 exports at this time will lead to successively
It crosses the second pressure regulator valve 31, second pressure valve 32 and the second snorkel 17 to enter in the rodless cavity 15 of driving stage body 6, drive simultaneously
Air in the rod chamber 12 of grade body 6 will pass sequentially through 30 row of the first snorkel 14, first pressure valve 29 and first row air valve
Enter in air.
With the lasting gas supply of air compressor machine 1,15 pressure of rodless cavity of driving stage body 6 gradually increases, and pushes driving stage
Piston 8 is moved to rod chamber, and the displacement distance of driving stage piston 8 is directly measured by rod-pulling type displacement sensor 19 in real time.
With the movement of driving stage piston 8, synchronous drive piston rod 10 and feeding grade piston 9 are moved, and then make feeding
The rodless cavity 23 of grade body 7 is compressed, and under pressure, the analog material in the rodless cavity 23 of feeding grade body 7 will pass through
Discharge nozzle 27 is discharged, while the rod chamber 21 of feeding grade body 7 sucks air by pressure balance air hole 22 by makes intracavitary body
Product increase, until rod-pulling type displacement sensor 19 monitor piston displacement distance reach setting value, close the second pressure regulator valve at this time
31, discharging process terminates.
It, can be by adjusting the first pressure regulator valve 28 or 34 internal valve of valve body of the second pressure regulator valve 31 during charging and discharging
The aperture of core to realize the adjustment to pressure-air gas supply flow, and then realizes the adjusting to charging and discharging speed.
Scheme in embodiment be not to limit the scope of patent protection of the present invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the claims of this case.
Claims (4)
1. one kind being suitable for the large size molding air pump drive-type feeding controllers of geological model 3D, it is characterised in that：Including pneumatics
Machine, pneumatic control valve group, feeding control host, inlet control valve and discharging control valve；The feeding control host is divided into driving
Grade body and feeding grade body, are fixedly connected between driving stage body and feeding grade body by adapter flange；In the driving stage
Driving stage piston is provided in body, driving stage piston is that sealing is slidably matched with driving stage body；In the feeding grade body
It is inside provided with feeding grade piston, feeding grade piston is that sealing is slidably matched with feeding grade body；The driving stage piston and feeding
It is fixedly connected with by piston rod between grade piston, piston rod packing runs through adapter flange, and adds between piston rod and adapter flange
Equipped with linear bearing；The first blow vent, the pneumatic control valve group are offered on the rod chamber shell of the driving stage body
It is connected with the first blow vent by the first snorkel；The second ventilation is offered on the rodless cavity shell of the driving stage body
Mouthful, the pneumatic control valve group is connected by the second snorkel with the second blow vent；The air compressor machine passes through high pressure gas pipeline
It is connected with pneumatic control valve group；It is provided with rod-pulling type displacement sensor, rod-pulling type in the rod chamber of the driving stage body
Displacement sensor is parallel with piston rod, and rod-pulling type displacement sensor one end is fixed on adapter flange, rod-pulling type displacement sensing
The device other end is fixed on the piston rod by Change-over frame；Pressure balance is offered on the rod chamber shell of the feeding grade body
Air hole；Inlet port and outlet port are offered respectively on the rodless cavity shell of the feeding grade body；The inlet control valve
It is connected with feed inlet by feed pipe, discharging control valve is connected by discharge nozzle with discharge port.
2. one kind according to claim 1 is suitable for the large size molding air pump drive-type feeding controllers of geological model 3D,
It is characterized in that：The pneumatic control valve group includes the first pressure regulator valve, first pressure valve, first row air valve, the second pressure regulator valve, the
Two pressure valve and second row air valve；The inlet end of first pressure regulator valve is connected by high pressure gas pipeline with air compressor machine, and first adjusts
The outlet side of pressure valve is connected by first pressure valve with the first snorkel all the way, and another way is connected by first row air valve with air
It is logical；The inlet end of second pressure regulator valve is connected by high pressure gas pipeline with air compressor machine, the outlet side a-road-through of the second pressure regulator valve
It crosses second pressure valve with the second snorkel to be connected, another way is connected by second row air valve with air.
3. one kind according to claim 1 is suitable for the large size molding air pump drive-type feeding controllers of geological model 3D,
It is characterized in that：First pressure regulator valve and the second pressure regulation valve arrangement are identical, include valve body, driving motor, driving gear and
Driven gear；The driving motor is packed on valve body, and the driving gear is fixedly set on the motor shaft of driving motor；Institute
It states driven gear to be fixedly set on the spool body of rod of valve body, driven gear is meshed with driving gear；It is defeated by driving motor
Go out torque, drives driving gear and driven gear rotation, the aperture for adjusting valve body inner spool successively.
4. one kind according to claim 1 is suitable for the large size molding air pump drive-type feeding controllers of geological model 3D,
It is characterized in that：The inlet control valve is identical with discharging control valve structure, includes valve casing, hose, the bar that shuts off, steering engine, drive
Driving wheel and driving spring；The hose is located at valve casing inside bottom, and hose both ends are respectively connected with switching nut；The steering engine is fixedly mounted with
On valve casing top, driving wheel bias is packed on the motor shaft of steering engine；Described bar one end of shutting off abuts against the wheel contacted in driving wheel
Along upper, the outer tube wall of shut off the bar other end and hose, which abuts against, to be engaged for disk outer periphery；The driving spring is located inside valve casing,
Driving spring is parallel with the bar that shuts off, and driving spring one end is connected on valve casing, and the driving spring other end is by adapting rod and cuts
Flow post is fixedly connected with；It is moved in a straight line, unlatching for adjusting hose tube chamber and is closed by steering engine or the driving spring drive bar that shuts off
It closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810383809.5A CN108638288B (en) | 2018-04-26 | 2018-04-26 | Air pump drive type feeding controller suitable for 3D forming of large geological model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810383809.5A CN108638288B (en) | 2018-04-26 | 2018-04-26 | Air pump drive type feeding controller suitable for 3D forming of large geological model |
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| CN108638288A true CN108638288A (en) | 2018-10-12 |
| CN108638288B CN108638288B (en) | 2020-07-10 |
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| US20230065581A1 (en) * | 2021-09-01 | 2023-03-02 | Petróleo Brasileiro S.A. - Petrobras | System for demolding materials obtained by means of the freeze-casting technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230065581A1 (en) * | 2021-09-01 | 2023-03-02 | Petróleo Brasileiro S.A. - Petrobras | System for demolding materials obtained by means of the freeze-casting technique |
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| CN108638288B (en) | 2020-07-10 |
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