CN108638288B - Air pump drive type feeding controller suitable for 3D forming of large geological model - Google Patents
Air pump drive type feeding controller suitable for 3D forming of large geological model Download PDFInfo
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- CN108638288B CN108638288B CN201810383809.5A CN201810383809A CN108638288B CN 108638288 B CN108638288 B CN 108638288B CN 201810383809 A CN201810383809 A CN 201810383809A CN 108638288 B CN108638288 B CN 108638288B
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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
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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
- 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
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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
- 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
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- 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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- 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
An air pump driving type feeding controller suitable for 3D forming of a large geological model comprises an air compressor, a pneumatic control valve group, a feeding control host, a feeding control valve and a discharging control valve; the feeding control host is divided into a driving-stage machine body and a feeding-stage machine body which are fixedly connected through a transfer flange; pistons are arranged in the two machine bodies and are fixedly connected through piston rods, and the piston rods penetrate through the adapter flange in a sealing manner; two air vents are arranged on the driving stage machine body and respectively correspond to the rod cavity or the rodless cavity of the driving stage machine body; the pneumatic control valve group is respectively connected with the two air vents through the two air pipes; the air compressor is connected with the pneumatic control valve bank; a displacement sensor is arranged in a rod cavity of the driving stage machine body, one end of the displacement sensor is fixedly connected with the adapter flange, and the other end of the displacement sensor is fixedly connected with the piston rod; the feeding stage machine body is provided with a pressure balance vent hole corresponding to the rod cavity of the feeding stage machine body, and a feeding hole and a discharging hole corresponding to the rodless cavity of the feeding stage machine body; the feeding control valve is connected with the feeding port through a feeding pipe, and the discharging control valve is connected with the discharging port through a discharging pipe.
Description
Technical Field
The invention belongs to the technical field of large three-dimensional physical model preparation, and particularly relates to an air pump driving type feeding controller suitable for 3D forming of a large geological model.
Background
The method simulates the excavation process of the natural rock mass engineering through a physical model test, and is an important method for predicting and forecasting the geological disaster of the large rock mass engineering. The geological model is made of rock mass similar materials, the rock mass similar materials are usually composed of cement, gypsum, sand, iron powder, barite and the like, and before the geological model is made, the rock mass similar materials are required to be uniformly stirred, and then the stirred rock mass similar materials are supplied to a 3D forming machine for use through pumping equipment.
At present, the stirred rock similar materials are mainly conveyed by two kinds of pumping equipment, including a screw conveyor and a plunger conveyor. However, the existing two pumping devices cannot accurately control the discharge amount, and the adjustability of the discharge amount is weak; when the pumping operation is finished, the pumping equipment is inconvenient to disassemble and clean.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an air pump driving type feeding controller suitable for 3D forming of a large geological model, which can be used for replacing a traditional screw conveyor and a traditional plunger conveyor, can accurately control the discharge amount, and has strong capability of adjusting the discharge amount; after pumping work is finished, the feeding controller can be detached, and cleaning is more convenient.
In order to achieve the purpose, the invention adopts the following technical scheme: an air pump driving type feeding controller suitable for 3D forming of a large geological model comprises an air compressor, a pneumatic control valve group, a feeding control host, a feeding control valve and a discharging control valve; the feeding control host is divided into a driving-stage body and a feeding-stage body, and the driving-stage body is fixedly connected with the feeding-stage body through a transfer flange; a driving-stage piston is arranged in the driving-stage machine body and is in sealing sliding fit with the driving-stage machine body; a feeding-stage piston is arranged in the feeding-stage machine body and is in sealing sliding fit with the feeding-stage machine body; the drive-stage piston and the feeding-stage piston are fixedly connected through a piston rod, the piston rod penetrates through the adapter flange in a sealing manner, and a linear bearing is additionally arranged between the piston rod and the adapter flange; a first air vent is formed in a rod cavity shell of the driving stage machine body, and the pneumatic control valve group is connected with the first air vent through a first air pipe; a second air vent is formed in the rodless cavity shell of the driving stage body, and the pneumatic control valve group is connected with the second air vent through the second air vent; the air compressor is connected with the pneumatic control valve group through a high-pressure air delivery pipe; a pull rod type displacement sensor is arranged in a rod cavity of the driving stage body and is parallel to the piston rod, one end of the pull rod type displacement sensor is fixed on the adapter flange, and the other end of the pull rod type displacement sensor is fixed on the piston rod through the adapter frame; a pressure balance vent hole is formed in the rod cavity shell of the feeding stage machine body; a feed inlet and a discharge outlet are respectively arranged on the rodless cavity shell of the feeding stage machine body; the feeding control valve is connected with the feeding hole through a feeding pipe, and the discharging control valve is connected with the discharging hole through a discharging pipe.
The pneumatic control valve group comprises a first pressure regulating valve, a first pressure valve, a first exhaust valve, a second pressure regulating valve, a second pressure valve and a second exhaust valve; the air inlet end of the first pressure regulating valve is connected with the air compressor through a high-pressure air conveying pipe, one path of the air outlet end of the first pressure regulating valve is connected with the first vent pipe through a first pressure valve, and the other path of the air outlet end of the first pressure regulating valve is communicated with the atmosphere through a first vent valve; the air inlet end of the second pressure regulating valve is connected with the air compressor through a high-pressure air conveying pipe, one path of the air outlet end of the second pressure regulating valve is connected with the second vent pipe through a second pressure valve, and the other path of the air outlet end of the second pressure regulating valve is communicated with the atmosphere through a second vent valve.
The first pressure regulating valve and the second pressure regulating valve are identical in structure and respectively comprise a valve body, a driving motor, a driving gear and a driven gear; the driving motor is fixedly arranged on the valve body, and the driving gear is fixedly sleeved on a motor shaft of the driving motor; the driven gear is fixedly sleeved on a valve core rod body of the valve body and is meshed with the driving gear; the driving motor outputs torque to sequentially drive the driving gear and the driven gear to rotate so as to adjust the opening of the valve core in the valve body.
The feeding control valve and the discharging control valve have the same structure and respectively comprise a valve shell, a hose, a cut-off rod, a steering engine, a driving wheel and a driving spring; the hose is positioned at the bottom of the inner side of the valve shell, and two ends of the hose are connected with adapter nuts; the steering engine is fixedly arranged at the top end of the valve shell, and the driving wheel is eccentrically and fixedly arranged on a motor shaft of the steering engine; one end of the cut-off rod is abutted against and contacted with the peripheral edge of the wheel disc of the driving wheel, and the other end of the cut-off rod is abutted against and matched with the outer pipe wall of the hose; the driving spring is positioned in the valve shell, the driving spring is parallel to the intercepting rod, one end of the driving spring is fixedly connected to the valve shell, and the other end of the driving spring is fixedly connected with the intercepting rod through the adapter rod; the intercepting rod is driven to do linear motion through the steering engine or the driving spring and is used for adjusting the opening and closing of the tube cavity of the hose.
The invention has the beneficial effects that:
the air pump driving type feeding controller suitable for 3D forming of the large geological model can be used for replacing a traditional spiral conveyor and a traditional plunger conveyor, can accurately control the discharge amount, and is strong in discharge amount adjustability; after pumping work is finished, the feeding controller can be detached, and cleaning is more convenient.
Drawings
FIG. 1 is a schematic structural diagram of an air pump-driven feed controller suitable for 3D forming of a large geological model according to the present invention;
FIG. 2 is a schematic structural diagram of a feeding control host according to the present invention;
FIG. 3 is a schematic diagram of the pneumatic control valve assembly of the present invention;
FIG. 4 is a schematic diagram of the first/second pressure regulating valve of the present invention;
FIG. 5 is a schematic structural view of a feed control valve/discharge control valve of the present invention;
in the figure, 1-air compressor, 2-pneumatic control valve group, 3-feeding control host, 4-feeding control valve, 5-discharging control valve, 6-driving stage body, 7-feeding stage body, 8-driving stage piston, 9-feeding stage piston, 10-piston rod, 11-linear bearing, 12-rod cavity of driving stage body, 13-first vent hole, 14-first vent pipe, 15-rodless cavity of driving stage body, 16-second vent hole, 17-second vent pipe, 18-high pressure gas pipe, 19-pull rod type displacement sensor, 20-switching frame, 21-rod cavity of feeding stage body, 22-pressure balance vent hole, 23-rodless cavity of feeding stage body, 24-feed inlet, 25-discharge outlet, 26-feed pipe, 27-discharge pipe, 28-first pressure regulating valve, 29-first pressure valve, 30-first discharge valve, 31-second pressure regulating valve, 32-a second pressure valve, 33-a second exhaust valve, 34-a valve body, 35-a driving motor, 36-a driving gear, 37-a driven gear, 38-a valve casing, 39-a hose, 40-a shutoff rod, 41-a steering engine, 42-a driving wheel, 43-a driving spring, 44-an adapter nut, 45-an adapter rod, 46-an adapter flange and 47-a quick connector.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 5, an air pump driving type feeding controller suitable for 3D molding of a large-scale geological model comprises an air compressor 1, a pneumatic control valve group 2, a feeding control host 3, a feeding control valve 4 and a discharging control valve 5; the feeding control host 3 is divided into a driving stage body 6 and a feeding stage body 7, and the driving stage body 6 is fixedly connected with the feeding stage body 7 through a transfer flange 46; a driving-stage piston 8 is arranged in the driving-stage machine body 6, and the driving-stage piston 8 is in sealing sliding fit with the driving-stage machine body 6; a feeding-stage piston 9 is arranged in the feeding-stage machine body 7, and the feeding-stage piston 9 is in sealing sliding fit with the feeding-stage machine body 7; the driving-stage piston 8 and the feeding-stage piston 9 are fixedly connected through a piston rod 10, the piston rod 10 hermetically penetrates through an adapter flange 46, and a linear bearing 11 is additionally arranged between the piston rod 10 and the adapter flange 46; a first air vent 13 is formed in a shell of a rod cavity 12 of the driving stage body 6, and the pneumatic control valve group 2 is connected with the first air vent 13 through a first air vent pipe 14; a second vent 16 is arranged on a casing of a rodless cavity 15 of the driving stage body 6, and the pneumatic control valve group 2 is connected with the second vent 16 through a second vent pipe 17; the air compressor 1 is connected with the pneumatic control valve group 2 through a high-pressure air delivery pipe 18; a pull rod type displacement sensor 19 is arranged in the rod cavity 12 of the driving stage body 6, the pull rod type displacement sensor 19 is parallel to the piston rod 10, one end of the pull rod type displacement sensor 19 is fixed on the adapter flange 46, and the other end of the pull rod type displacement sensor 19 is fixed on the piston rod 10 through the adapter bracket 20; a pressure balance vent hole 22 is arranged on the shell of the rod cavity 21 of the feeding stage machine body 7; a feed inlet 24 and a discharge outlet 25 are respectively arranged on the shell of the rodless cavity 23 of the feeding stage machine body 7; the feed control valve 4 is connected to the feed opening 24 via a feed pipe 26, and the discharge control valve 5 is connected to the discharge opening 25 via a discharge pipe 27.
The pneumatic control valve group 2 comprises a first pressure regulating valve 28, a first pressure valve 29, a first exhaust valve 30, a second pressure regulating valve 31, a second pressure valve 32 and a second exhaust valve 33; the air inlet end of the first pressure regulating valve 28 is connected with the air compressor 1 through a high-pressure air conveying pipe 18, one path of the air outlet end of the first pressure regulating valve 28 is connected with the first vent pipe 14 through a first pressure valve 29, and the other path of the air outlet end of the first pressure regulating valve 28 is communicated with the atmosphere through a first vent valve 30; the air inlet end of the second pressure regulating valve 31 is connected with the air compressor 1 through a high-pressure air pipe 18, one path of the air outlet end of the second pressure regulating valve 31 is connected with the second vent pipe 17 through a second pressure valve 32, and the other path of the air outlet end of the second pressure regulating valve 31 is communicated with the atmosphere through a second vent valve 33.
The first pressure regulating valve 28 and the second pressure regulating valve 31 have the same structure, and both comprise a valve body 34, a driving motor 35, a driving gear 36 and a driven gear 37; the driving motor 35 is fixedly arranged on the valve body 34, and the driving gear 36 is fixedly sleeved on a motor shaft of the driving motor 35; the driven gear 37 is fixedly sleeved on a valve core rod body of the valve body 34, and the driven gear 37 is meshed with the driving gear 36; the driving motor 35 outputs torque to sequentially drive the driving gear 36 and the driven gear 37 to rotate, so as to adjust the opening of the valve core in the valve body 34.
The feeding control valve 4 and the discharging control valve 5 have the same structure and respectively comprise a valve casing 38, a hose 39, a cut-off rod 40, a steering engine 41, a driving wheel 42 and a driving spring 43; the hose 39 is positioned at the bottom of the inner side of the valve shell 38, and two ends of the hose 39 are connected with adapter nuts 44; the steering engine 41 is fixedly arranged at the top end of the valve casing 38, and the driving wheel 42 is eccentrically and fixedly arranged on a motor shaft of the steering engine 41; one end of the cut-off rod 40 is abutted against and contacted with the peripheral edge of the wheel disc of the driving wheel 42, and the other end of the cut-off rod 40 is abutted against and matched with the outer pipe wall of the hose 39; the driving spring 43 is positioned in the valve housing 38, the driving spring 43 is parallel to the intercepting rod 40, one end of the driving spring 43 is fixedly connected to the valve housing 38, and the other end of the driving spring 43 is fixedly connected with the intercepting rod 40 through the adapter rod 45; the intercepting rod is driven to do linear motion through the steering engine 41 or the driving spring 43, and the intercepting rod is used for adjusting the opening and closing of the tube cavity of the hose 39.
The following describes one application of the present invention with reference to the accompanying drawings:
starting a steering engine 41 of the feeding control valve 4 to drive a driving wheel 42 to eccentrically rotate, and enabling the cut-off rod 40 to move upwards under the action of a driving spring 43, so that the tube cavity of the hose 39 is completely opened; meanwhile, the steering engine 41 of the discharging control valve 5 is started, so that the eccentric rotation of the driving wheel 42 is converted into the linear motion of the intercepting rod 40, the intercepting rod 40 moves downwards, and the tube cavity of the hose 39 is completely closed. At this time, the feed control valve 4 is in an open state, and the discharge control valve 5 is in a closed state.
Starting the air compressor 1, simultaneously opening the first pressure regulating valve 28, the first pressure valve 29, the second pressure valve 32 and the second exhaust valve 33, and closing the first exhaust valve 30 and the second pressure regulating valve 31; at this time, the high-pressure air output from the air compressor 1 passes through the first pressure regulating valve 28, the first pressure valve 29, and the first vent pipe 14 in order to enter the rod chamber 12 of the driving stage body 6, and the air in the rodless chamber 15 of the driving stage body 6 passes through the second vent pipe 17, the second pressure valve 32, and the second vent valve 33 in order to be discharged into the atmosphere.
With the continuous air supply of the air compressor 1, the pressure of the rod chamber 12 of the driving stage body 6 is gradually increased, and the driving stage piston 8 is pushed to move towards the rodless chamber, and the moving distance of the driving stage piston 8 is directly measured in real time through the pull rod type displacement sensor 19.
With the movement of the driving-stage piston 8, the piston rod 10 and the feeding-stage piston 9 are synchronously driven to move, so that the rod cavity 21 of the feeding-stage machine body 7 is compressed, air in the cavity is directly discharged into the atmosphere through the pressure balance vent hole 22, meanwhile, the rodless cavity 23 of the feeding-stage machine body 7 presents negative pressure, similar materials are sucked into the rodless cavity 23 of the feeding-stage machine body 7 under the action of the negative pressure until the piston moving distance monitored by the pull-rod type displacement sensor 19 reaches a set value, at this moment, the first pressure regulating valve 28 is closed, and the feeding process is finished.
Next, the discharging process is executed, the feeding control valve 4 is closed, the discharging control valve 5 is opened, the second pressure regulating valve 31 and the first exhaust valve 30 are opened, and the second exhaust valve 33 is closed; at this time, the high-pressure air output from the air compressor 1 passes through the second pressure regulating valve 31, the second pressure valve 32, and the second vent pipe 17 in sequence and enters the rodless chamber 15 of the driving stage body 6, and the air in the rod chamber 12 of the driving stage body 6 passes through the first vent pipe 14, the first pressure valve 29, and the first vent valve 30 in sequence and is discharged into the atmosphere.
With the continuous air supply of the air compressor 1, the pressure of the rodless cavity 15 of the driving stage body 6 is gradually increased, and the driving stage piston 8 is pushed to move towards the rod cavity, and the moving distance of the driving stage piston 8 is directly measured in real time through the pull rod type displacement sensor 19.
With the movement of the driving-stage piston 8, the piston rod 10 and the feeding-stage piston 9 are synchronously driven to move, so that the rodless cavity 23 of the feeding-stage machine body 7 is compressed, similar materials in the rodless cavity 23 of the feeding-stage machine body 7 are discharged through the discharge pipe 27 under the action of pressure, meanwhile, the rod cavity 21 of the feeding-stage machine body 7 sucks air through the pressure balance air holes 22 to increase the volume in the cavity, until the piston moving distance monitored by the pull-rod type displacement sensor 19 reaches a set value, at this moment, the second pressure regulating valve 31 is closed, and the discharging process is finished.
In the feeding and discharging processes, the adjustment of the air supply flow of the high-pressure air and further the adjustment of the feeding and discharging speed can be realized by adjusting the opening degree of the valve core in the valve body 34 of the first pressure regulating valve 28 or the second pressure regulating valve 31.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. The utility model provides an air pump drive formula pay-off controller suitable for large-scale geological model 3D shaping which characterized in that: the pneumatic feeding device comprises an air compressor, a pneumatic control valve group, a feeding control host, a feeding control valve and a discharging control valve; the feeding control host is divided into a driving-stage body and a feeding-stage body, and the driving-stage body is fixedly connected with the feeding-stage body through a transfer flange; a driving-stage piston is arranged in the driving-stage machine body and is in sealing sliding fit with the driving-stage machine body; a feeding-stage piston is arranged in the feeding-stage machine body and is in sealing sliding fit with the feeding-stage machine body; the drive-stage piston and the feeding-stage piston are fixedly connected through a piston rod, the piston rod penetrates through the adapter flange in a sealing manner, and a linear bearing is additionally arranged between the piston rod and the adapter flange; a first air vent is formed in a rod cavity shell of the driving stage machine body, and the pneumatic control valve group is connected with the first air vent through a first air pipe; a second air vent is formed in the rodless cavity shell of the driving stage body, and the pneumatic control valve group is connected with the second air vent through the second air vent; the air compressor is connected with the pneumatic control valve group through a high-pressure air delivery pipe; a pull rod type displacement sensor is arranged in a rod cavity of the driving stage body and is parallel to the piston rod, one end of the pull rod type displacement sensor is fixed on the adapter flange, and the other end of the pull rod type displacement sensor is fixed on the piston rod through the adapter frame; a pressure balance vent hole is formed in the rod cavity shell of the feeding stage machine body; a feed inlet and a discharge outlet are respectively arranged on the rodless cavity shell of the feeding stage machine body; the feeding control valve is connected with the feeding hole through a feeding pipe, and the discharging control valve is connected with the discharging hole through a discharging pipe; the pneumatic control valve group comprises a first pressure regulating valve, a first pressure valve, a first exhaust valve, a second pressure regulating valve, a second pressure valve and a second exhaust valve; the air inlet end of the first pressure regulating valve is connected with the air compressor through a high-pressure air conveying pipe, one path of the air outlet end of the first pressure regulating valve is connected with the first vent pipe through a first pressure valve, and the other path of the air outlet end of the first pressure regulating valve is communicated with the atmosphere through a first vent valve; the air inlet end of the second pressure regulating valve is connected with the air compressor through a high-pressure air conveying pipe, one path of the air outlet end of the second pressure regulating valve is connected with a second vent pipe through a second pressure valve, and the other path of the air outlet end of the second pressure regulating valve is communicated with the atmosphere through a second vent valve; the first pressure regulating valve and the second pressure regulating valve are identical in structure and respectively comprise a valve body, a driving motor, a driving gear and a driven gear; the driving motor is fixedly arranged on the valve body, and the driving gear is fixedly sleeved on a motor shaft of the driving motor; the driven gear is fixedly sleeved on a valve core rod body of the valve body and is meshed with the driving gear; the driving motor outputs torque to sequentially drive the driving gear and the driven gear to rotate so as to adjust the opening of a valve core in the valve body; the feeding control valve and the discharging control valve have the same structure and respectively comprise a valve shell, a hose, a cut-off rod, a steering engine, a driving wheel and a driving spring; the hose is positioned at the bottom of the inner side of the valve shell, and two ends of the hose are connected with adapter nuts; the steering engine is fixedly arranged at the top end of the valve shell, and the driving wheel is eccentrically and fixedly arranged on a motor shaft of the steering engine; one end of the cut-off rod is abutted against and contacted with the peripheral edge of the wheel disc of the driving wheel, and the other end of the cut-off rod is abutted against and matched with the outer pipe wall of the hose; the driving spring is positioned in the valve shell, the driving spring is parallel to the intercepting rod, one end of the driving spring is fixedly connected to the valve shell, and the other end of the driving spring is fixedly connected with the intercepting rod through the adapter rod; the intercepting rod is driven to do linear motion through the steering engine or the driving spring and is used for adjusting the opening and closing of the tube cavity of the hose.
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| 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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| 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 CN108638288A (en) | 2018-10-12 |
| CN108638288B true CN108638288B (en) | 2020-07-10 |
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| BR102021017434A2 (en) * | 2021-09-01 | 2023-03-14 | Petróleo Brasileiro S.A. - Petrobras | SYSTEM FOR RELEASING MATERIALS OBTAINED THROUGH THE FREEZE-CASTING TECHNIQUE |
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| CN108638288A (en) | 2018-10-12 |
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