CN115957676A - Vertical multi-cavity continuous kneading machine - Google Patents
Vertical multi-cavity continuous kneading machine Download PDFInfo
- Publication number
- CN115957676A CN115957676A CN202211713120.7A CN202211713120A CN115957676A CN 115957676 A CN115957676 A CN 115957676A CN 202211713120 A CN202211713120 A CN 202211713120A CN 115957676 A CN115957676 A CN 115957676A
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- cavity
- chamber
- cover plate
- mixing
- vertical
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- 238000004898 kneading Methods 0.000 title claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000005728 strengthening Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 19
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000012467 final product Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 235000000621 Bidens tripartita Nutrition 0.000 description 1
- 240000004082 Bidens tripartita Species 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 208000006637 fused teeth Diseases 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention discloses a vertical multi-cavity continuous kneading machine which comprises a base and a mixing cavity arranged on the base, wherein one end of the mixing cavity is provided with a feeding hole, the other end of the mixing cavity is provided with a discharging hole, the mixing cavity is provided with a cavity, and the feeding hole is communicated with the discharging hole and the cavity; the chambers are multiple and the axes are vertical to the base; the vertical multi-cavity continuous kneader also comprises a kneading device arranged above the mixing cavity, and the kneading device comprises a cavity cover plate covered on the mixing cavity and a kneading device arranged on the cavity cover plate; the kneading device comprises a paddle and a driving device connected with the paddle, the paddle is positioned on one side of the cavity cover plate and positioned in the cavity, and the driving device is arranged on the other side of the cavity cover plate; the whole kneader adopts a vertical structure; the continuous kneader has the characteristics of low requirement on equipment tightness, difficult material storage at the blade root and low cleaning difficulty while inheriting the advantages of a multi-cavity continuous kneader. The chamber and the lower baffle are of an integrated structure, no gap exists, and the problem of sealing of a contact part is not required to be considered.
Description
Technical Field
The invention relates to the field of continuous kneading, in particular to a vertical multi-cavity continuous kneading machine.
Background
The multi-cavity continuous kneader is a continuous mixing device formed by combining a plurality of independently operated and mutually communicated mixing chambers, has the functions of mixing, kneading, crushing, dispersing and the like of a conventional kneader, can realize continuous operation of high-viscosity materials, and has the remarkable advantages of high yield, flexible process, wide material applicability and the like.
The multi-cavity continuous kneader which is commonly used at present is formed by combining a plurality of horizontal kneading units which are communicated with each other, and essentially belongs to the category of the horizontal kneader. Therefore, the multi-chamber continuous kneader also has general problems of a horizontal kneader such as high requirements for sealing performance at a chamber cover plate and a shaft seal, and easy stock of a blade root. Because the multi-cavity continuous kneader ensures the mixing quality and the mixing efficiency, the clearance between the root of the blade and the rear cover plate of the cavity is designed to be small, so that the cleaning of the stored materials is difficult.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a vertical multi-cavity continuous kneader, which solves the problems that the multi-cavity continuous kneader in the prior art has high requirements on equipment tightness and is difficult to clean.
In order to solve the technical problems, the invention adopts the following technical scheme: a vertical multi-cavity continuous kneading machine comprises a base and a mixing cavity arranged on the base, wherein one end of the mixing cavity is provided with a feeding hole, the other end of the mixing cavity is provided with a discharging hole, the mixing cavity is provided with a cavity, and the feeding hole is communicated with the discharging hole and the cavity;
the number of the chambers is multiple, and the axes of the chambers are vertical to the base;
the vertical multi-cavity continuous kneader also comprises a kneading device arranged above the mixing cavity, and the kneading device comprises a cavity cover plate covered on the mixing cavity and a kneading device arranged on the cavity cover plate;
the kneading device comprises a paddle and a driving device connected with the paddle, the paddle is positioned on one side of the chamber cover plate and positioned in the chamber, and the driving device is arranged on the other side of the chamber cover plate;
the invention also has the following technical characteristics:
the inner peripheral section of the cavity is an 8-shaped section formed by connecting two circular arcs;
a sieve plate is arranged between the adjacent chambers, and the aperture of the sieve plate is gradually reduced along the direction from the feed inlet to the discharge outlet;
the cavity is internally provided with a pair of paddles, and the rotating directions of each pair of paddles are opposite.
The chamber comprises a premixing chamber, a mixing strengthening chamber and a pumping chamber which are sequentially arranged along the direction from the feeding port to the discharging port;
the premixing chamber is communicated with the feeding hole, and the pumping pressure chamber is communicated with the discharging hole;
the number of the premixing chambers is one, the number of the mixing strengthening chambers is four, and the number of the pumping chambers is one;
the driving device comprises a motor, a speed reducer and a transmission case which are connected in sequence, and the transmission case is arranged on the cavity cover plate;
the paddle is connected with the transmission case;
a lifting device is also arranged between the chamber cover plate and the base;
the lifting device comprises a cover plate bracket arranged on the cover plate of the cavity chamber and a hydraulic device arranged between the cover plate bracket and the base;
the top surface of the base is provided with an installation block, the installation block is provided with a guide rail, and the cover plate bracket is connected with the guide rail;
a feeding hopper is arranged on the feeding hole, and an outlet flow channel is arranged on the discharging hole;
and water jacket temperature control systems are arranged in the cavity cover plate, the mixing cavity and the outlet flow channel.
Compared with the prior art, the invention has the following technical effects:
compared with the prior art, the kneader is integrally of a vertical structure, and the material is positioned at the lower half part of the cavity without contacting with the shaft seal under the action of gravity; the continuous kneader has the characteristics of low requirement on equipment tightness, difficult material storage at the blade root and low cleaning difficulty while inheriting the advantages of a multi-cavity continuous kneader. The chamber and the lower baffle are of an integrated structure, no gap exists, and the problem of sealing of a contact part is not required to be considered.
(II) the vertical multi-cavity continuous kneading machine has the advantages of simple structure, convenient operation, safety, reliability, strong adaptability, high automatic construction efficiency and high operation precision, and can be matched with a machine group system to complete construction operation.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
the various reference numbers in the drawings have the meanings given below:
1-a base; 2-a mixing chamber; 3-discharging port; 4-a chamber; 5-kneading device, 6-sieve plate, 7-lifting device, 8-mounting block, 9-feeding hopper and 10-outlet flow channel;
4-1 premixing chamber, 4-2 mixing strengthening chamber, 4-3 pumping chamber;
5-1 chamber cover plate, 5-2 kneading device;
5-2-1 paddle, 5-2-2 driving device, 5-2-3 motor, 5-2-4 reducer and 5-2-5 transmission case
7-1 cover plate bracket; 7-2 hydraulic means.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments are given as examples of the present invention, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are included in the protection scope of the present invention.
As used herein, the terms "upper," "lower," "front," "back," "top," "bottom," and the like are used in an orientation or positional relationship that is indicated for convenience in describing the invention and to simplify the description, but does not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operative in a particular orientation, "inner" and "outer" refer to the inner and outer of the contours of the corresponding parts and are not to be construed as limiting the invention.
In the present invention, the terms "mounted," "connected," "fixed," and the like are used broadly, and may be, for example, fixedly connected, detachably connected, or integrated without being described to the contrary; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
All components in the present invention, unless otherwise specified, are all those known in the art.
Example 1:
according to the technical scheme, as shown in fig. 1, the vertical multi-cavity continuous kneader comprises a base 1 and a mixing cavity 2 arranged on the base 1, wherein one end of the mixing cavity 2 is provided with a feeding hole, the other end of the mixing cavity is provided with a discharging hole 3, the mixing cavity 2 is provided with a cavity 4, and the feeding hole is communicated with the discharging hole 3 and the cavity 4;
the chambers 4 are multiple and the axes are vertical to the base 1;
the vertical multi-cavity continuous kneader also comprises a kneading device 5 arranged above the mixing cavity 2, wherein the kneading device 5 comprises a cavity cover plate 5-1 covered on the mixing cavity 2 and a kneading device 5-2 arranged on the cavity cover plate 5-1;
the kneading device 5-2 comprises a blade 5-2-1 and a driving device 5-2-2 connected with the blade 5-2-1, the blade 5-2-1 is positioned on one side of the chamber cover plate 5-1 and positioned in the chamber 4, and the driving device 5-2-2 is arranged on the other side of the chamber cover plate 5-1. The root of the blade 5-2-1 is set to be a conical structure. The material is not easy to store, and the distance between the blade root and the chamber cover plate is larger, so that the blade root and the chamber cover plate are easy to clean.
Compared with the prior art, the kneader adopts a vertical structure as a whole, and the material is positioned at the position of the lower half part of the chamber 4 without contacting with the shaft seal under the action of gravity; the continuous kneader has the characteristics of low requirement on equipment tightness, difficult material storage at the blade root and low cleaning difficulty while inheriting the advantages of a multi-cavity continuous kneader. The chamber and the lower baffle are of an integrated structure, no gap exists, and the problem of sealing of a contact part is not required to be considered.
As a preference of this embodiment:
the inner peripheral section of the chamber 4 is an 8-shaped section formed by connecting two circular arcs;
a sieve plate 6 is arranged between the adjacent chambers 4, and the aperture of the sieve plate 6 is gradually reduced along the direction from the feed inlet to the discharge outlet 3;
the chamber 4 comprises a pair of paddles 5-2-1, and the rotating directions of each pair of paddles 5-2-1 are opposite.
As a preference of this embodiment:
the chamber 4 comprises a premixing chamber 4-1, a mixing enhancement chamber 4-2 and a pumping pressure chamber 4-3 which are sequentially arranged along the direction from the feeding port to the discharging port 3;
the premixing chamber 4-1 is communicated with the feed inlet, and the pumping pressure chamber 4-3 is communicated with the discharge outlet 3.
In the embodiment, each chamber 4 is provided with a groove fixed sieve plate 6, and the aperture of the sieve plate 6 is 48 meshes, 192 meshes, 432 meshes, 768 meshes and 1200 meshes from the premixing chamber 4-1 to the pumping chamber 4-3 in sequence.
The minimum clearance between the blades 5-2-1 is 0.5mm;
the premixing chamber 4-1 uses four-tooth blades with strong dispersing ability;
the mixing strengthening chamber 4-2 adopts a double-tooth blade with smaller mixing pressure and shearing force;
the pumping chamber 4-3 adopts 8-shaped blades with strong rolling capability and stable discharge;
the premixing chamber is mainly used for preliminarily mixing solid and liquid raw materials from the feeding hole to form a solid-liquid mixture with certain flow characteristics;
the mixing enhancement chamber is mainly used for further mixing the materials from the premixing chamber, so that the components in the mixture are more uniformly distributed;
the pumping chamber can crush bubbles wrapped in high-viscosity materials in the mixing process, and can provide stable pumping pressure, so that stable discharging at an outlet is facilitated;
the opposite rotation of the double blades can repeatedly knead the materials to be uniform and simultaneously generate transverse pushing action on the materials, thereby achieving the purpose of continuously mixing the materials.
As a preference of this embodiment:
the number of the premixing chambers 4-1 is one, the number of the mixing strengthening chambers 4-2 is four, and the number of the pumping chambers 4-3 is one.
As a preference of the present embodiment:
the driving device 5-2-2 comprises a motor 5-2-3, a speed reducer 5-2-4 and a transmission case 5-2-5 which are sequentially connected, wherein the transmission case 5-2-5 is arranged on a cavity cover plate 5-1;
the paddle 5-2-1 is connected with the transmission case 5-2-5;
the paddle 5-2-1 is driven by a motor 5-2-3 through a transmission case 5-2-5 after being decelerated by a speed reducer 5-2-4.
As a preference of this embodiment:
a lifting device 7 is also arranged between the cavity cover plate 5-1 and the base 1;
the lifting device 7 comprises a cover plate bracket 7-1 arranged on the cavity cover plate 5-1 and a hydraulic device 7-2 arranged between the cover plate bracket 7-1 and the base 1;
the lifting device 7 drives the chamber cover plate 5-1 to cover or separate from the upper surface of the mixing chamber 2 through the extension and retraction of the hydraulic device 7-2, so that on one hand, each part is convenient to clean, and on the other hand, each part is convenient to maintain.
As a preference of the present embodiment:
the top surface of the base 1 is provided with an installation block 8, the installation block 8 is provided with a guide rail, and the cover plate bracket 7-1 is connected with the guide rail.
As a preference of this embodiment:
a feeding hopper 9 is arranged on the feeding hole, and an outlet flow passage 10 is arranged on the discharging hole 3;
a feeding hopper 9 is arranged on the side wall of the premixing chamber 4-1 and used for feeding raw materials of a mixed material formula; an outlet flow channel 10 is arranged on the side wall of the pumping chamber 4-3 and used for discharging a mixed final product;
as a preference of the present embodiment:
and water jacket temperature control systems are arranged in the cavity cover plate 5-1, the mixing cavity 2 and the outlet flow channel 10. The water inlet and return mode is set as lower inlet and upper outlet.
Under some conditions, certain materials can generate heat to cause thermal degradation of the materials in the kneading process of applying shearing force to the blades 5-2-1, the temperature in the mixing cavity 2 is adjusted by adding liquids with different temperatures into the water jacket temperature control system, and the temperature in the kneading process is controlled to further ensure that a better kneading effect is achieved.
The working process of the embodiment is as follows:
the base 1 is stably placed on the ground; the mixing cavity 2 is fixed on the upper plane of the base; the chamber 4 comprises a premixing chamber 4-1, a mixing enhancement chamber 4-2 and a pumping pressure chamber 4-3 which are sequentially arranged along the direction from the feeding port to the discharging port 3;
a feeding hopper 9 is arranged on the side wall of the premixing chamber 4-1 and used for feeding raw materials of a mixed material formula; a discharge port 3 is arranged on the side wall of the pumping chamber 4-3 and used for discharging a mixed final product; an outlet flow channel 10 is arranged at the discharge port 3 and used for guiding the mixed final product discharged from the discharge port 3 to a container for containing materials; the paddle 5-2-1 is arranged on the cavity chamber cover plate 5-1 and is connected with a transmission box 5-2-5 which internally comprises a transmission gear and a transmission shaft; the transmission case 5-2-5 drives the motor 5-2-3 after being decelerated by the decelerator 5-2-4; the cavity cover plate 5-1 is fixed on the cover plate bracket 7-1; the cover plate bracket 7-1 is connected with the base 1 through a guide rail; three hydraulic devices 7-2 are arranged on two sides and in front of the cover plate bracket 7-1 and are used for pushing the whole driving device 5-2-2 up and down and opening and closing the chamber cover plate 5-1.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A vertical multi-cavity continuous kneader comprises a base (1) and a mixing cavity (2) arranged on the base (1), wherein one end of the mixing cavity (2) is provided with a feeding hole, the other end of the mixing cavity is provided with a discharging hole (3), the mixing cavity (2) is provided with a cavity (4), and the feeding hole is communicated with the discharging hole (3) and the cavity (4); the device is characterized in that the chambers (4) are multiple and the axes are vertical to the base (1);
the vertical multi-cavity continuous kneader also comprises a kneading device (5) arranged above the mixing cavity (2), wherein the kneading device (5) comprises a cavity cover plate (5-1) covered on the mixing cavity (2) and the kneading device (5-2) arranged on the cavity cover plate (5-1);
the kneading device (5-2) comprises a paddle (5-2-1) and a driving device (5-2-2) connected with the paddle (5-2-1), the paddle (5-2-1) is positioned on one side of the chamber cover plate (5-1) and positioned in the chamber (4), and the driving device (5-2-2) is arranged on the other side of the chamber cover plate (5-1).
2. A vertical multichamber continuous kneader as in claim 1, characterized in that the cross section of the inner circumference of said chamber (4) is a figure-8 cross section formed by connecting two circular arcs;
a sieve plate (6) is arranged between the adjacent chambers (4), and the aperture of the sieve plate (6) is gradually reduced along the direction from the feed inlet to the discharge outlet (3);
the chamber (4) contains a pair of paddles (5-2-1), and the rotating directions of each pair of paddles (5-2-1) are opposite.
3. A vertical multi-cavity continuous kneader according to claim 2, characterized in that the chamber (4) comprises a premixing chamber (4-1), a mixing enhancing chamber (4-2) and a pumping chamber (4-3) arranged in this order from the feed inlet to the discharge outlet (3);
the premixing chamber (4-1) is communicated with the feed inlet, and the pumping chamber (4-3) is communicated with the discharge outlet (3).
4. A vertical multichamber continuous kneader as in claim 3, whereby there is one premixing chamber (4-1), four mixing and strengthening chambers (4-2) and one pumping chamber (4-3).
5. A vertical multi-cavity continuous kneader according to claim 1, characterized in that the drive means (5-2-2) comprises a motor (5-2-3), a decelerator (5-2-4) and a transmission case (5-2-5) connected in this order, and the transmission case (5-2-5) is installed on a cover plate (5-1) of the cavity;
the paddle (5-2-1) is connected with the transmission case (5-2-5).
6. A vertical multichamber continuous kneader as in claim 5, characterized in that lifting means (7) are further installed between said chamber cover (5-1) and said base (1).
The lifting device (7) comprises a cover plate bracket (7-1) arranged on the cavity cover plate (5-1) and a hydraulic device (7-2) arranged between the cover plate bracket (7-1) and the base (1);
7. a vertical multichamber continuous kneader according to claim 6, characterized in that the top surface of said base (1) is provided with mounting blocks (8), the mounting blocks (8) are provided with guide rails, and said cover plate holders (7-1) are connected to the guide rails.
8. A vertical multichamber continuous kneader as in claim 1, characterized in that said inlet opening is provided with a hopper (9) and said outlet opening (3) is provided with an outlet channel (10).
9. The vertical multichamber continuous kneader according to claim 8, characterized in that the cover plates (5-1) of the chamber, the mixing chambers (2) and the outlet runners (10) are provided with a water jacket temperature control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211713120.7A CN115957676A (en) | 2022-12-29 | 2022-12-29 | Vertical multi-cavity continuous kneading machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211713120.7A CN115957676A (en) | 2022-12-29 | 2022-12-29 | Vertical multi-cavity continuous kneading machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115957676A true CN115957676A (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211713120.7A Pending CN115957676A (en) | 2022-12-29 | 2022-12-29 | Vertical multi-cavity continuous kneading machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN115957676A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU146484A1 (en) * | 1960-09-16 | 1961-11-30 | Б.М. Гершкович | Vertical Plasticizer-Mixer Continuous |
| CN2034471U (en) * | 1988-03-07 | 1989-03-22 | 国营山东化工厂 | Mixing kneading reaction pot |
| CN101747516A (en) * | 2008-12-19 | 2010-06-23 | 瓦克化学股份公司 | Continuous method for preparing precursor composition used for organosilicon composition with improved stability |
| CN101954255A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Paddles of three-paddle vertical kneader |
| CN109664429A (en) * | 2018-12-17 | 2019-04-23 | 西安近代化学研究所 | A kind of modularization multi-chamber continuous kneader |
| US20210187784A1 (en) * | 2019-12-20 | 2021-06-24 | Anna CHENIUNTAI | Mixing and feeding system for 3d printing of buildings |
| DE102020006640A1 (en) * | 2020-10-29 | 2022-05-05 | Staedtler Mars Gmbh & Co. Kg | Device for applying masses and their use |
-
2022
- 2022-12-29 CN CN202211713120.7A patent/CN115957676A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU146484A1 (en) * | 1960-09-16 | 1961-11-30 | Б.М. Гершкович | Vertical Plasticizer-Mixer Continuous |
| CN2034471U (en) * | 1988-03-07 | 1989-03-22 | 国营山东化工厂 | Mixing kneading reaction pot |
| CN101747516A (en) * | 2008-12-19 | 2010-06-23 | 瓦克化学股份公司 | Continuous method for preparing precursor composition used for organosilicon composition with improved stability |
| CN101954255A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Paddles of three-paddle vertical kneader |
| CN109664429A (en) * | 2018-12-17 | 2019-04-23 | 西安近代化学研究所 | A kind of modularization multi-chamber continuous kneader |
| US20210187784A1 (en) * | 2019-12-20 | 2021-06-24 | Anna CHENIUNTAI | Mixing and feeding system for 3d printing of buildings |
| DE102020006640A1 (en) * | 2020-10-29 | 2022-05-05 | Staedtler Mars Gmbh & Co. Kg | Device for applying masses and their use |
Non-Patent Citations (2)
| Title |
|---|
| 吴玉金, 野延年: "混合生产中固体推进剂的安全问题", 固体火箭技术, no. 04, 25 December 1998 (1998-12-25) * |
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