CN112662416A - Carbonization and tar recovery equipment - Google Patents
Carbonization and tar recovery equipment Download PDFInfo
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- CN112662416A CN112662416A CN201910976169.3A CN201910976169A CN112662416A CN 112662416 A CN112662416 A CN 112662416A CN 201910976169 A CN201910976169 A CN 201910976169A CN 112662416 A CN112662416 A CN 112662416A
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- box body
- stirring
- carbonization
- tar recovery
- stirring shaft
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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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention relates to carbonization and tar recovery equipment, which comprises: the stirring device comprises a box body, more than two stirring shafts, a heating mechanism and a driving mechanism, wherein the box body is provided with a feeding hole and a discharging hole; more than two stirring shafts are arranged at the bottom of the box body in parallel, and stirring blades are arranged on the stirring shafts; the heating mechanism is used for heating the box body; the driving mechanism is used for driving the stirring shaft to stir the raw materials in the box body, the raw materials are conveyed to the other end of the box body from one end of the box body, and stirring spaces formed by two adjacent stirring shafts are communicated with each other. The invention has small occupied area, is convenient for processing the equipment and forms a circulated and continuous stirring mode, thus leading the raw material to be completely refined.
Description
Technical Field
The invention relates to the technical field of oil refining, in particular to carbonization and tar recovery equipment.
Background
In recent years, with the rise of chemical and chemical industries, chemical products are more and more widely applied in daily life of people, and the following problems are the treatment of some chemical wastes, such as: sludge, rubber, catalyst, plastic, etc. The oil sludge, the rubber, the catalyst and the plastic are hardly naturally decomposed in nature, so that the oil sludge, the rubber, the catalyst and the plastic need to be manually recycled, and oil refining is performed on the oil sludge, the rubber, the catalyst and the plastic by oil refining equipment in the prior art.
In the process of implementing the present invention, the inventor finds that the refinery equipment in the prior art has the following problems:
1. the refining equipment in the prior art adopts a single stirring shaft, the length of the single stirring shaft is too long, the processing is inconvenient, the corresponding equipment is matched with the length of the stirring shaft, the occupied area is large, and the production is not facilitated.
2. The oil refining equipment in the prior art cannot realize circular continuous oil refining, and is usually shut down to transport out waste materials after a furnace oil is refined, so that the production efficiency is low.
3. The oil refining equipment in the prior art has stirring dead angles, generally only stirring, and cannot circularly move the raw materials, so that local raw materials are excessively heated, the local raw materials are low in heating, and the oil refining is incomplete.
Disclosure of Invention
Therefore, it is necessary to provide a carbonization and tar recovery device for solving the technical problems in the prior art.
In order to achieve the above object, the present inventors provide a carbonization and tar recovery apparatus comprising:
the box body is provided with a feeding hole and a discharging hole;
the stirring shafts are arranged at the bottom of the box body in parallel, and stirring blades are arranged on the stirring shafts;
the heating mechanism is used for heating the box body; and
and the driving mechanism is used for driving the stirring shaft to stir the raw materials in the box body, conveying the raw materials to the other end of the box body from one end of the box body, and mutually communicating stirring spaces formed by two adjacent stirring shafts.
As a preferable structure of the present invention, a baffle is disposed between two adjacent stirring shafts, and stirring spaces formed by the two adjacent stirring shafts are communicated with each other at the end of the stirring shaft.
As a preferable structure of the present invention, the entire box body is hermetically provided, and the heating mechanism is provided at a bottom of the box body and configured to heat the bottom of the box body.
As a preferable structure of the present invention, the tank includes an inner partition and an outer partition, and a hot gas passage is formed between the inner partition and the outer partition.
As a preferable structure of the present invention, a plurality of protrusions are provided in the hot gas passage, and the plurality of protrusions partition the hot gas passage into S-shaped hot gas passages.
As a preferable structure of the present invention, an oil outlet channel is disposed at a top of the tank, and the oil outlet channel is used for collecting recovered oil.
In a preferred configuration of the present invention, the bottom of the tank is provided with two or more reinforcing beams, and the two or more reinforcing beams are arranged in this order along the arrangement direction of the stirring shafts.
As a preferable structure of the present invention, the bottom of the box body is provided with a first arc-shaped portion and a second arc-shaped portion, and the first arc-shaped portion and the second arc-shaped portion are connected with each other and are respectively matched with two adjacent stirring shafts.
As a preferable structure of the present invention, a reinforcing plate is provided between the first arc-shaped portion and the second arc-shaped portion.
As a preferable structure of the present invention, two ends of the stirring shaft are respectively disposed in the box body through bearings, the driving mechanism is disposed outside the box body, and a cooling water tank is disposed at one end of the stirring shaft close to the driving mechanism, and is disposed on the stirring shaft and used for cooling the stirring shaft.
Different from the prior art, the technical scheme is that the box body is provided with a feeding hole and a discharging hole; the stirring shafts are arranged at the bottom of the box body in parallel, and stirring blades are arranged on the stirring shafts; the driving mechanism is used for driving the stirring shaft to stir the raw materials in the box body, the raw materials are conveyed to the other end of the box body from one end of the box body, and stirring spaces formed by two adjacent stirring shafts are communicated with each other.
In the production process, raw materials enter from a feed inlet of a box body, a first stirring shaft stirs the raw materials, the raw materials are conveyed to the middle section or the tail end of the first stirring shaft while stirring, and the raw materials enter the middle section or the starting end of a stirring space of a second stirring shaft from the middle section or the tail end of the first stirring shaft, so that the second stirring shaft stirs the raw materials; so circulating until the raw materials flow out of the discharge hole. In this case, the following advantages are provided:
1. change original single (mixing) shaft into two or more than two (mixing) shafts to two (mixing) shafts are taken as an example, and the equipment of single (mixing) shaft needs 10m, and the length of two (mixing) shafts only need 5m can, the processing of the (mixing) shaft of being convenient for, equipment area is little, makes things convenient for the processing of equipment.
2. Two adjacent the middle section or the end intercommunication in the stirring space that the stirring shaft formed, the raw materials gets into from the feed inlet of first (mixing) shaft, and first (mixing) shaft promotes the raw materials and moves forward, and at the in-process that moves forward, the while is advancing oil refining, arrives the middle section or the end of first (mixing) shaft, and the raw materials is from the end of first (mixing) shaft to the middle section or the initiating terminal of second (mixing) shaft to second (mixing) shaft stirs the raw materials, so circulate, flow out the discharge gate until the raw materials. A recyclable and continuous stirring mode is formed, so that the raw material refining is complete.
3. The end parts of the stirring blades are matched with the bottom of the box body, so that no stirring dead angle exists, the situations that local raw materials are heated too much, the local raw materials are heated too low, and oil refining is incomplete are prevented.
4. The raw materials are conveyed to the other end of the box body from one end of the box body, and the raw materials enter and exit one by one, so that feeding and discharging can be realized at the same time, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic view of the structure of the carbonization and tar recovery apparatus according to the embodiment;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a side view of the carbonization and tar recovery apparatus according to an embodiment;
FIG. 4 is a top view of the carbonization and tar recovery apparatus according to the embodiment;
FIG. 5 is an enlarged view of a portion of FIG. 4 at B;
FIG. 6 is a schematic structural view of a hot gas path according to an embodiment;
FIG. 7 is a schematic view of a structural entity of the stirring shaft in another embodiment;
FIG. 8 is a front view of another embodiment of the mixing shaft.
Description of reference numerals:
1. the box body is provided with a plurality of air inlets,
11. an inner baffle plate is arranged on the inner side of the inner baffle plate,
12. an outer baffle plate is arranged on the outer side of the inner baffle plate,
13. the passage of the hot gas is provided with a hot gas channel,
131. a convex part is arranged on the upper surface of the shell,
14. a first arc-shaped part, a second arc-shaped part,
15. a second arc-shaped part is arranged on the first arc-shaped part,
16. the reinforcing plate is provided with a plurality of reinforcing plates,
17. a feeding hole is arranged on the upper surface of the shell,
18. a discharge hole is arranged on the bottom of the container,
2. a stirring shaft is arranged on the stirring shaft,
21. the stirring blades are arranged on the upper surface of the stirring body,
3. an oil outlet channel is arranged on the oil tank,
4. the reinforcing beam is a beam which is reinforced,
5. a bearing is arranged on the bearing seat, and the bearing seat,
6. a cooling water tank is arranged in the water tank,
7. and a baffle plate.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
Referring to fig. 1 to 4, the present embodiment relates to a carbonization and tar recovery apparatus, which includes a tank 1, two or more stirring shafts 2, a heating mechanism and a driving mechanism; more than two stirring shafts 2 are arranged at the bottom of the box body 1 in parallel, and stirring blades 21 are arranged on the stirring shafts 2; in this embodiment, two stirring shafts 2 are taken as an example; however, the number of the stirring shafts 2 is not limited to two, and three, four or more stirring shafts 2 may be used, and the like, and the present embodiment is also within the scope of the present embodiment.
In this embodiment, the stirring shaft 2 is used for stirring the raw material and pushing the raw material to roll forward, and the driving mechanism (not shown in the figure) is used for driving the stirring shaft 2 to rotate. The heating mechanism (not shown) is used for heating the box body 1, refining the raw material, and extracting and adding residual oil, plastic oil, rubber oil, oil sludge and industrial waste oil from oil sludge, rubber, catalytic substances and plastics. The driving mechanism and the heating mechanism are the prior art, and the description is not repeated.
In this embodiment, the box body 1 is provided with a feeding hole 17 and a discharging hole 18, and in this embodiment, the feeding hole 17 and the discharging hole 18 of the box body 1 are arranged at the same end of the box body 1. In the embodiment of three or five stirring shafts 2, the feed inlet 17 and the discharge outlet 18 of the tank 1 are arranged at both ends of the tank 1.
Preferably, the whole box body 1 is hermetically arranged, and the heating mechanism is arranged at the bottom of the box body 1 and used for heating the bottom of the box body 1. So, whole heat is from bottom to top heating, keeps the heat in box 1, improves thermal utilization ratio. It should be noted that the heating mechanism is disposed outside the tank 1, and may also heat the bottom of the tank 1, preferably, the heating mechanism directly heats the first arc-shaped portion 14 and the second arc-shaped portion 15 of the tank 1, respectively, so as to ensure that most of the heat is transferred to the refinery feedstock.
In this embodiment, the driving mechanism (not shown in the figure) is configured to drive the stirring shaft 2 to stir the raw material in the box 1, and convey the raw material from one end of the box 1 to the other end of the box 1, and stirring spaces formed by two adjacent stirring shafts 2 are communicated with each other.
Optionally, in this embodiment, a baffle 7 is disposed between two adjacent stirring shafts 2, and stirring spaces formed by the two adjacent stirring shafts 2 are communicated with each other at the end of the stirring shaft 2. At this time, the raw material enters from the feed inlet 17 of the first stirring shaft 2, the first stirring shaft 2 pushes the raw material to move forward, in the process of moving forward, the raw material is refined while moving forward, the raw material reaches the tail end of the first stirring shaft 2, the raw material moves from the tail end of the first stirring shaft 2 to the starting end of the second stirring shaft 2, so that the second stirring shaft 2 stirs the raw material, and the process is circulated until the raw material flows out of the discharge outlet 18. A recyclable and continuous stirring mode is formed, so that the raw material refining is complete.
In other embodiments, the stirring space formed by two adjacent stirring shafts 2 may not be provided with a partition plate, so that the raw material is always circulated in the stirring space, or a plurality of intercommunicated places are arranged on the stirring space formed by two adjacent stirring shafts 2, so that a small circulation can be formed, and the existence of the partition plate, the size of the partition plate, and the like can be adjusted according to different oil refining requirements, which are within the protection scope of this embodiment. This embodiment is for making the raw materials run the length of whole (mixing) shaft 2, just two stirring length, just can refine oil and accomplish, just can last feeding, last ejection of compact.
Optionally, an oil outlet channel 3 is arranged at the top of the tank 1, and the oil outlet channel 3 is used for collecting recovered oil. So, reach the uniform temperature in the box 1, oil forms gas and rises, reaches the top of oil outlet channel 3, and the precooling solidifies into liquid, collects.
Optionally, the bottom of the box body 1 is provided with a first arc-shaped portion 14 and a second arc-shaped portion 15, and the first arc-shaped portion 14 is connected with the second arc-shaped portion 15 and is respectively matched with two adjacent stirring shafts 2. At this time, the first arc-shaped part 14 and the second arc-shaped part 15 are connected with each other, the end parts of the stirring blades 21 of two adjacent stirring shafts 2 are matched with the first arc-shaped part 14 and the second arc-shaped part 15, so that no stirring dead angle exists, the situations that local raw materials are heated too much, local raw materials are heated too low, and oil refining is incomplete are prevented.
Optionally, the bottom of the tank 1 is provided with more than two reinforcing beams 4, and the more than two reinforcing beams 4 are sequentially arranged along the arrangement direction of the stirring shafts 2. The reinforcing beam 4 is disposed below the first arc-shaped portion 14 and the second arc-shaped portion 15, and is used for supporting the first arc-shaped portion 14 and the second arc-shaped portion 15.
As shown in fig. 1 and 2, a reinforcing plate 16 is optionally disposed between the first arc-shaped portion 14 and the second arc-shaped portion 15. At this time, the reinforcing plate 16 is used for reinforcing the first arc-shaped portion 14 and the second arc-shaped portion 15, and prevents the first arc-shaped portion 14 and the second arc-shaped portion 15 from expanding and extruding each other in the heating process, thereby prolonging the service life.
As shown in fig. 4 and 5, optionally, two ends of the stirring shaft 2 are respectively disposed in the box 1 through bearings 5, the driving mechanism is disposed outside the box 1, a cooling water tank 6 is disposed at one end of the stirring shaft 2 close to the driving mechanism, and the cooling water tank 6 is disposed on the stirring shaft 2 and is used for cooling the stirring shaft 2. In the oil refining heating process, the temperature of the stirring shaft 2 is higher, and reaches about 400-plus 600 degrees, and the stirring shaft 2 is heated to expand, so that the stress point of the driving mechanism on the stirring shaft 2 is changed, and the transmission working condition is complex. At the moment, the end, close to the driving mechanism, of the stirring shaft 2 is cooled through the cooling water tank 6, the temperature of the end, close to the driving mechanism, of the stirring shaft 2 is guaranteed to be constant, the stress point of the driving mechanism on the stirring shaft 2 is stable, and transmission is stable.
As shown in fig. 1 and 6, optionally, the box body 1 includes an inner partition 11 and an outer partition 12, and a hot gas channel 13 is formed between the inner partition 11 and the outer partition. At this time, the hot gas is transferred from the bottom to the top through the hot gas passage 13.
Optionally, a plurality of protrusions 131 are disposed in the hot gas channel 13, and the plurality of protrusions 131 partition the hot gas channel 13 into S-shaped hot gas channels 13. At this time, the S-shaped hot gas passage 13 is formed, and the hot gas gradually goes upward from below around the S-shaped hot gas passage 13, thereby improving the utilization rate of energy.
As shown in fig. 7 and 8, in other examples, the shape of the stirring blade 21 of the stirring shaft 2 is different from that of the stirring blade 21 of the stirring shaft 2 of the above-described embodiment, and the principle is the same. In addition, in other embodiments, the feeding port 17 and the discharging port 18 of the box body 1 can be on the same side as the driving mechanism. At this time, the raw material enters from the feeding port 17, is stirred to the bottom, and then is discharged from the discharging port 18, so that the whole oil refining process is completed.
In the using process, the stirring shafts 2 start to rotate, the raw material enters from the feeding hole 17 of the first stirring shaft 2, the first stirring shaft 2 pushes the raw material to move forwards, in the moving forward process, the raw material is refined while moving forwards, and the raw material reaches the middle section or the tail end of the first stirring shaft 2 and moves from the tail end of the first stirring shaft 2 to the middle section or the starting end of the second stirring shaft 2, so that the second stirring shaft 2 stirs the raw material, and the process is circulated until the raw material flows out of the discharging hole 18. A recyclable and continuous stirring mode is formed, so that the raw material refining is complete.
The carbonization and tar recovery equipment of the embodiment is convenient for processing the stirring shaft 2, small in occupied area and convenient for processing the equipment. A recyclable and continuous stirring mode is formed, so that the raw material refining is complete. No stirring dead angle exists, the situations that local raw materials are heated too much, the local raw materials are heated too low and oil refining is incomplete are prevented. Can realize feeding and discharging at the same time, and improves the production efficiency.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (10)
1. Carbonization and tar recovery plant, its characterized in that includes:
the box body is provided with a feeding hole and a discharging hole;
the stirring shafts are arranged at the bottom of the box body in parallel, and stirring blades are arranged on the stirring shafts;
the heating mechanism is used for heating the box body; and
and the driving mechanism is used for driving the stirring shaft to stir the raw materials in the box body, conveying the raw materials to the other end of the box body from one end of the box body, and mutually communicating stirring spaces formed by two adjacent stirring shafts.
2. The carbonization and tar recovery apparatus according to claim 1, characterized in that: and a baffle is arranged between the two adjacent stirring shafts, and stirring spaces formed by the two adjacent stirring shafts are communicated with each other at the tail ends of the stirring shafts.
3. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the box body is integrally arranged in a sealing mode, and the heating mechanism is arranged at the bottom of the box body and used for heating the bottom of the box body.
4. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the box body comprises an inner partition plate and an outer partition plate, and a hot gas channel is formed between the inner partition plate and the partition plates.
5. The carbonization and tar recovery apparatus according to claim 4, characterized in that: a plurality of protruding parts are arranged in the hot gas channel, and the hot gas channel is divided into S-shaped hot gas channels by the protruding parts.
6. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the top of box is provided with out the oil passageway, it is used for collecting the recovered oil to go out the oil passageway.
7. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the bottom of the box body is provided with more than two reinforcing beams which are sequentially arranged along the arrangement direction of the stirring shaft.
8. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the bottom of box is provided with first arc portion and second arc portion, first arc portion with second arc portion interconnect, and respectively with two adjacent stirring axle adaptations.
9. The carbonization and tar recovery apparatus according to claim 8, characterized in that: a reinforcing plate is arranged between the first arc-shaped part and the second arc-shaped part.
10. The carbonization and tar recovery apparatus according to claim 1, characterized in that: the stirring shaft is arranged in the box body through bearings at two ends respectively, the driving mechanism is arranged outside the box body, a cooling water tank is arranged at one end, close to the driving mechanism, of the stirring shaft, and the cooling water tank is arranged on the stirring shaft and used for cooling the stirring shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976169.3A CN112662416B (en) | 2019-10-15 | 2019-10-15 | Carbonization and tar recovery equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976169.3A CN112662416B (en) | 2019-10-15 | 2019-10-15 | Carbonization and tar recovery equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112662416A true CN112662416A (en) | 2021-04-16 |
| CN112662416B CN112662416B (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910976169.3A Active CN112662416B (en) | 2019-10-15 | 2019-10-15 | Carbonization and tar recovery equipment |
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| CN (1) | CN112662416B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397627A (en) * | 2001-07-23 | 2003-02-19 | 北京国硕科技开发有限责任公司 | Process and equipment for preparing gasoline and diesel oil from waste plastics and/or heavy oil |
| CN102212377A (en) * | 2011-05-13 | 2011-10-12 | 安徽禾盛生物能源有限公司 | Spiral biomass pyrolysis reactor with drying function |
| CN103952172A (en) * | 2014-04-24 | 2014-07-30 | 肖水田 | Full-automatic continuous waste rubber and plastic cracking and liquefying technology and complete equipment |
| CN105542830A (en) * | 2016-01-29 | 2016-05-04 | 潍坊金丝达新能源科技有限公司 | Double-spiral continuous cracking furnace |
| CN205288153U (en) * | 2015-12-15 | 2016-06-08 | 天紫环保装备制造（天津）有限公司 | Multiaxis stirring structure of mixer |
| CN105927983A (en) * | 2016-06-28 | 2016-09-07 | 成和环保科技股份有限公司 | Screw propelling type solid waste continuous carbonization equipment and continuous carbonization method |
| CN207468549U (en) * | 2017-10-25 | 2018-06-08 | 康永立 | Continuous solid waste regeneration utilization equipment |
-
2019
- 2019-10-15 CN CN201910976169.3A patent/CN112662416B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397627A (en) * | 2001-07-23 | 2003-02-19 | 北京国硕科技开发有限责任公司 | Process and equipment for preparing gasoline and diesel oil from waste plastics and/or heavy oil |
| CN102212377A (en) * | 2011-05-13 | 2011-10-12 | 安徽禾盛生物能源有限公司 | Spiral biomass pyrolysis reactor with drying function |
| CN103952172A (en) * | 2014-04-24 | 2014-07-30 | 肖水田 | Full-automatic continuous waste rubber and plastic cracking and liquefying technology and complete equipment |
| CN205288153U (en) * | 2015-12-15 | 2016-06-08 | 天紫环保装备制造（天津）有限公司 | Multiaxis stirring structure of mixer |
| CN105542830A (en) * | 2016-01-29 | 2016-05-04 | 潍坊金丝达新能源科技有限公司 | Double-spiral continuous cracking furnace |
| CN105927983A (en) * | 2016-06-28 | 2016-09-07 | 成和环保科技股份有限公司 | Screw propelling type solid waste continuous carbonization equipment and continuous carbonization method |
| CN207468549U (en) * | 2017-10-25 | 2018-06-08 | 康永立 | Continuous solid waste regeneration utilization equipment |
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|---|---|
| CN112662416B (en) | 2022-11-29 |
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