CN111744388A - Carbon fiber silicon carbide composite material stirrer - Google Patents
Carbon fiber silicon carbide composite material stirrer Download PDFInfo
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- CN111744388A CN111744388A CN202010683387.0A CN202010683387A CN111744388A CN 111744388 A CN111744388 A CN 111744388A CN 202010683387 A CN202010683387 A CN 202010683387A CN 111744388 A CN111744388 A CN 111744388A
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- silicon carbide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
- B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
- B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
- B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/10—Maintenance of mixers
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- Chemical Kinetics & Catalysis (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a carbon fiber silicon carbide composite material stirrer which is mainly technically characterized in that: impeller mounting hole department of impeller, the shaft extension department of (mixing) shaft and extension connecting axle is equipped with the connecting key groove respectively, arrange the blade of bending in impeller wheel hub's one side equidistant array respectively, the connecting portion of the blade of bending adopts the material to be 1.4529 bolted connection with one side of impeller wheel hub, the blade of bending rotates along the (mixing) shaft and with the material contact order in proper order, first section of bending, the second section of bending, third section of bending and fourth section of bending have set gradually, the inlayer of the blade of bending is the substrate chip, substrate chip equipartition sets up the through-hole, carbon fiber silicon carbide composite material layer sees through the through-hole cladding of substrate chip at substrate chip surface. The beneficial effects are that: the corrosion resistance and the washout resistance of the stirrer are improved, the wear resistance is high, the impact resistance is strong, the stirrer is not layered or isolated in the stirring process, has good thixotropy and no flow in construction, does not contain volatile solvents, is safe and nontoxic, and prolongs the service life.
Description
Technical Field
The invention relates to a stirrer, in particular to a carbon fiber silicon carbide composite stirrer.
Background
At present, along with the increasingly severe environment protection situation, the international and national level pay attention to energy conservation, emission reduction, energy consumption reduction, cyclic utilization improvement and the like. Such as all thermal power generating units, must perform flue gas desulfurization while maximizing service life for the equipment used therein. In the desulfurization mixing process of conveying and stirring limestone slurry by the stirrer, the impeller needs to deal with complex mediums of acid and alkali salts, the mediums have corrosiveness and washability, and the mediums can generate stronger knocking force in the moving process.
Secondly, in the prior art, the stirrer generally has the defects of layering and segregation in the stirring process, and the defects are more serious along with the abrasion of the stirrer. When the mixed agitator of desulfurization of current structure and this type of medium direct contact use, the short inherent problem of ubiquitous life, even adopt magnetic induction, novel technique such as contactless sealing to and the super austenitic stainless steel material of high cost, still can't avoid the impeller of agitator to corrode, erode and strike under combined action's service environment, damage the phenomenon of inefficacy extremely soon. There is a need for an improved stirring device of the prior art.
Disclosure of Invention
The invention mainly aims to overcome the defects of the problems and provide the carbon fiber silicon carbide composite material stirrer with corrosion resistance, erosion resistance and strong impact resistance, so that the defects of stirring layering and segregation are overcome, and the service life in a severe medium environment is prolonged.
In order to overcome the problems, the invention adopts the technical scheme that:
including stirring driving motor and the speed reducer of being connected with stirring driving motor, the bearing box of being connected with the speed reducer, (mixing) shaft, install seal assembly, impeller, shaft coupling, the extension connecting axle of being connected with (mixing) shaft one end in the bearing box, characterized by: the stirring impeller is respectively provided with connecting key grooves at an impeller mounting hole, a stirring shaft and a shaft extension part of an extension connecting shaft, the stirring impeller is respectively connected with the stirring shaft and the extension connecting shaft through keys, the other end of the stirring shaft is connected with the extension connecting shaft through a coupler, the stirring impeller takes the center of an impeller hub as a reference, bending blades are respectively arranged on one side of the impeller hub in an equally-spaced array manner, a connecting part of the bending blades is connected with one side of the impeller hub through a bolt made of 1.4529, the bending blades rotate along the stirring shaft and are sequentially contacted with the material, a first bending section, a second bending section, a third bending section and a fourth bending section are sequentially arranged, an included angle alpha is formed between the first bending section of the bending blades and a vertical surface vertical to the axis of the stirring shaft, an included angle beta is formed between the second bending section of the bending blades and the vertical surface, and an included angle gamma is formed between the third bending section of, an included angle theta is formed between the fourth bending section of the bending blade and the vertical surface, the inner layer of the bending blade is a substrate chip, through holes are uniformly distributed in the substrate chip, and the carbon fiber silicon carbide composite material layer is coated on the surface of the substrate chip through the through holes of the substrate chip.
The method for coating the carbon fiber silicon carbide composite material layer on the bent blade comprises the following steps of,
firstly, construction preparation, wherein a construction scheme is drawn up, tools are prepared, and a silicon carbide ceramic material is prepared;
step two, mould pretreatment, namely cleaning the inner surface of the mould to ensure that the inner surface is clean and smooth, and then carrying out demoulding pretreatment to ensure that the mould is demoulded smoothly;
thirdly, pre-treating a base material chip of the bent blade, removing oil, dust and other loose materials on the surface, removing rust and water rust attached to the surface, and rolling the surface;
step four, assembling the die, namely putting the substrate chip of the bent blade into the die, and assembling the blade die;
and step five, stirring and mixing materials in vacuum, pouring the prepared silicon carbide material into vacuum stirring equipment, and stirring the silicon carbide ceramic material in vacuum for 30-120 min.
Step six, vibrating and casting ceramic, namely casting a mixed material and stirring a silicon carbide ceramic material into the combined mould; pouring while vibrating until the pouring is full;
seventhly, high-temperature curing treatment, namely putting the mold filled with the silicon carbide ceramic material into a heat treatment furnace, and adopting a secondary heating curing process, wherein the primary heating time is 30-60 min, the temperature is 60-80 ℃, the secondary heating time is 120-240 min, and the temperature is 120-160 ℃;
step eight, cooling treatment, namely cooling the die in a furnace cooling and air cooling mode, wherein the furnace cooling temperature range is 80-100 ℃, the furnace cooling time is 60-180 min, the air cooling environment temperature range is 10-25 ℃, and the air cooling time is 120-240 min;
step nine, removing the mold and cleaning, namely, after the mold components are disassembled in sequence, obtaining a bent blade carbon fiber silicon carbide composite material layer cleaning ceramic blade, and cleaning and smoothing the bent blade carbon fiber silicon carbide composite material layer;
and step ten, nondestructive testing, namely detecting the internal quality of the carbon fiber silicon carbide composite material by adopting ultrasonic flaw detection, having no defects such as air holes, slag inclusion, cracks and the like, and collecting the composite material after acceptance.
The invention has the beneficial effects that: in a severe medium environment, the corrosion resistance and the erosion resistance of the stirrer are improved, the wear resistance is high, the impact resistance is strong, the stirrer is not layered or separated in the stirring process, has good thixotropy and does not flow in construction, a volatile solvent is not contained, the stirrer is safe and nontoxic, and the service life of the stirrer is prolonged.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
Fig. 3 is a schematic structural view of a bent blade of the present invention.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 3.
FIG. 5 is a flow chart of a bent blade clad carbon fiber silicon carbide composite layer.
Detailed Description
As can be seen in fig. 1-5: including stirring driving motor 1 and the speed reducer 2 of being connected with stirring driving motor 1, the bearing box 3 of being connected with speed reducer 2, (mixing) shaft 5, install seal assembly 4, impeller 6, shaft coupling 7, the extension connecting axle 8, characterized by that of being connected with (mixing) shaft one end in the bearing box: the impeller mounting hole of the stirring impeller 6, the shaft extension parts of the stirring shaft 5 and the extension connecting shaft 8 are respectively provided with a connecting key groove 9, the stirring impeller 6 is respectively connected with the stirring shaft 5 and the extension connecting shaft 8 through a key, the other end of the stirring shaft 5 is connected with the extension connecting shaft 8 through a coupler 7, the stirring impeller 6 takes the center of the impeller hub 11 as a reference, one side of the impeller hub 11 is respectively provided with bending blades 12 in an equally-spaced array arrangement, the connecting parts of the bending blades 12 are connected with one side of the impeller hub 11 by bolts 20 made of 1.4529, the bending blades 12 are sequentially provided with a first bending section 13, a second bending section 14, a third bending section 15 and a fourth bending section 16 along the rotation direction of the stirring shaft 5 and in contact sequence with materials, an included angle alpha is formed between the first bending section 13 of the bending blades 12 and a vertical surface 19 which is vertical to the axis of the stirring, an included angle beta is formed between the second bending section 14 of the bending blade 13 and the vertical surface 19, an included angle gamma is formed between the third bending section 15 of the bending blade 12 and the vertical surface 19, an included angle theta is formed between the fourth bending section 16 of the bending blade 13 and the vertical surface 19, the inner layer of the bending blade 12 is a substrate chip 21, through holes are uniformly distributed in the substrate chip 21, and the carbon fiber silicon carbide composite material layer 22 penetrates through the through holes of the substrate chip 21 to be coated on the surface of the substrate chip 21. The material of the substrate chip 21 is carbon fiber, the thickness of the substrate chip 21 is within the range of 4mm-6mm, and the thickness of the carbon fiber silicon carbide composite material layer 22 coated on the surface of the substrate chip 21 is within the range of 15mm-25 mm.
The value of the included angle alpha is within the range of 10-20 degrees.
The value of the included angle beta is within the range of 20-30 degrees.
The value of the included angle gamma is within the range of 40-50 degrees.
The value of the included angle theta is within the range of 50 degrees to 70 degrees.
The wrapping of the carbon fiber silicon carbide composite material layer 22 by the bent blade 12 comprises the following steps,
s1, construction preparation, preparation of a construction scheme, preparation of tools and preparation of a silicon carbide ceramic material;
s2, preprocessing the die, cleaning the inner surface of the die to make the inner surface clean and smooth, and then preprocessing the demoulding to make the inner surface demoulded smoothly;
s3, pre-treating the substrate chip 21 of the bent blade 12, removing oil, dust and other loose materials on the surface, removing rust and water rust attached to the surface, and rolling the surface;
s4, assembling the die, namely putting the substrate chip 21 of the bent blade 12 into the die and assembling the blade die;
s5, stirring and mixing materials in vacuum, pouring the prepared silicon carbide material into vacuum stirring equipment, stirring the silicon carbide ceramic material in vacuum for 30-120 min.
Vibrating and casting ceramic, and pouring mixed materials into the combined mould and stirring the silicon carbide ceramic material; pouring while vibrating until the pouring is full;
s7, high-temperature curing, namely putting the die filled with the silicon carbide ceramic material into a heat treatment furnace, and adopting a secondary heating and curing process, wherein the primary heating time is 30-60 min, the temperature is 60-80 ℃, the secondary heating time is 120-240 min, and the temperature is 120-160 ℃;
s8, cooling, namely cooling the die in a furnace cooling and air cooling mode, wherein the furnace cooling temperature range is 80-100 ℃, the furnace cooling time is 60-180 min, the air cooling environment temperature range is 10-25 ℃, and the air cooling time is 120-240 min;
s9, removing the mold and cleaning, and after the mold components are disassembled in sequence, obtaining a bent blade carbon fiber silicon carbide composite material layer cleaning ceramic blade which is clean and smooth;
and S10, nondestructive testing, ultrasonic flaw detection is adopted to detect the internal quality of the carbon fiber silicon carbide composite material, no defects such as air holes, slag inclusion, cracks and the like exist, and the carbon fiber silicon carbide composite material is collected to a warehouse after acceptance.
The blade 12 that bends on impeller 6 has the cladding of carborundum composite material layer 22, has following advantage:
1) the paint has the characteristics of good operability, no delamination, no segregation, good thixotropy, no flowing during construction and the like;
2) the cured material has excellent mechanical properties, good toughness, shock resistance and impact resistance;
3) the paint is resistant to various complex media such as acid, alkali, salt and the like, and is also resistant to aging;
4) the environment-friendly type environment-.
The carbon fiber silicon carbide composite material layer 22 has been increasingly regarded as important due to its excellent specific strength, specific stiffness, corrosion resistance and fatigue resistance. Compared with a metal material, the carbon fiber silicon carbide composite material is light in weight, and simultaneously has very good performances in the aspects of modulus and mechanical strength, the modulus is higher than that of an aluminum alloy, the mechanical strength can reach a high-strength steel level through reasonable design, the mechanical strength is far higher than that of the aluminum alloy, and the advantages in the two aspects of performance and light weight are very obvious. Metallic materials are generally isotropic and have a yield or conditioned yield phenomenon. The carbon fiber has obvious directionality, the mechanical property along the fiber direction is 1-2 orders of magnitude higher than the properties along the vertical fiber direction and the longitudinal and transverse shearing properties, and the stress-strain curve is in linear elastic relation before fracture. Therefore, the carbon fiber silicon carbide composite material layer 22 can be formed by selecting the laying angle, the laying ratio and the laying sequence of the single layer according to the theory of the laminated plate. The required rigidity and strength performance can be obtained by targeted design according to the load distribution characteristics, and the unique coupling rigidity between the inside and the outside of the plane can be obtained. Whereas conventional metal materials can only be realized by thickening.
Compared with metal materials, the carbon fiber silicon carbide composite material layer 22 has strong acid and alkali corrosion resistance. The carbon fibers in the carbon fiber silicon carbide composite material layer 22 are of a microcrystalline structure similar to graphite crystals formed by high-temperature graphitization treatment at 2000-3000 ℃, the structure has high medium corrosion resistance, and can basically keep unchanged in the aspects of elastic modulus, strength, diameter and the like in hydrochloric acid, sulfuric acid or phosphoric acid with the concentration of 50%. Therefore, the carbon fiber silicon carbide composite material layer 22 is sufficiently ensured in terms of corrosion resistance as a reinforcing material.
The main contributors to the fatigue characteristics of carbon fiber silicon carbide composite layers are compressive strain and high strain levels. Fatigue properties are generally subjected to fatigue tests of compression (R = 10) and tension-compression (R = -1), while metal materials are generally subjected to tension-tension fatigue tests of R = 0.1. Compared with metal parts, particularly aluminum alloy, the carbon fiber silicon carbide composite material has excellent fatigue performance. In the fields with higher requirements on desulfurization, deslagging or other fatigue resistances, the carbon fiber silicon carbide composite material has better application advantages. While the carbon fiber silicon carbide composite layer 22 has little or no notch effect. Most carbon fiber silicon carbide composites have the same S-N curve with the notched test as the S-N curve without the notched test throughout their life.
In order to ensure the tightness degree of the surface attachment of the carbon fiber silicon carbide composite material layer 22 and the blade sheet body 17, impregnating resin is arranged between the silicon carbide layer and the surface of the blade sheet body 17 of the bent blade 12 so as to avoid the occurrence of internal hollowing of an interlayer structure, so that the surface of the blade is not easy to damage when continuously impacted by particles in a medium, and the internal structure of the bent blade 12 is effectively protected. The carbon fiber silicon carbide composite material layer 22 on the bending blade 12 forms a smooth surface with ceramic property, so that the stirring efficiency can be ensured to the maximum extent, and the effects of improving the efficiency of the whole machine and reducing the energy consumption are further achieved; the wear-resisting degree of the blade is improved by three times compared with that of a common blade, the service life of a product is obviously prolonged, and the problems of frequent replacement of spare parts, complex routine maintenance and high cost are thoroughly solved.
One end of a blade body 17 of the bending blade 12 is provided with a blade connecting part 18, and a first bending section 13, a second bending section 14, a third bending section 15 and a fourth bending section 16 are sequentially arranged on the blade body 17 along the contact sequence of the rotating blade body and the material. The included angle alpha between the first bending section 13 of the bending blade 12 and a vertical surface 19 vertical to the axis of the stirring shaft 5 can be between 10 and 20 degrees; the included angle beta between the second bending section 14 of the bending blade 12 and the vertical surface 19 can be 20-30 degrees; the included angle gamma between the third bending section 15 of the bending blade 12 and the vertical surface 18 can be 40-50 degrees; the included angle theta between the fourth bending section 16 of the bending blade 12 and the vertical surface 19 can be between 50 and 70 degrees; so as to effectively improve the stirring efficiency of the stirring impeller 6 while ensuring the strength of the bending blade 12. Each bent blade 12 is detachably connected to the end side of the impeller hub 11 via a blade connection portion 18.
The different positions of the impeller hub 11 assembled by the bent blades 12 and the different upward-thrust angles are also inherent characteristics of the embodiment, the optimal combination of the angles and the stirring efficiency is found through CFD and finite element analysis, and the final purpose is to facilitate the lifting of the stirring force, prevent the medium from winding or impacting, improve the overall rigidity and the surface strength, facilitate the construction, avoid the falling and the like. Because the stirrer needs to meet different medium requirements and needs to face different medium impact and stirring resistances, the thickness of the carbon fiber silicon carbide composite material layer 22 covering the surface of the base material chip 21 is determined to be any thickness value within the range of 15mm-25mm according to working condition environments and combined with CFD and finite element analysis, and the service life of the blade under the comprehensive load of corrosion, erosion, alternating impact, medium resistance and driving torque at any time is met.
In designing the carbon fiber as the base material chip 21, the strength design calculation is mainly based on the index of the important member in table 1 below.
TABLE 1 calculation of strength design basis index for important Components
The carbon fiber silicon carbide composite material layer 22 coated on the bending blade 12 in the structure can improve the stirring force to the maximum extent, reduce the resistance through the bending angle, greatly improve the efficiency of the stirrer due to the inherent characteristics of light weight and wear resistance, and is provided with a stirring device which is popularized to various severe working conditions such as papermaking, environmental protection, electric power, ore mining machines and the like.
The invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. The utility model provides a carbon fiber carborundum combined material agitator, includes stirring driving motor and the speed reducer of being connected with stirring driving motor, the bearing box of being connected with the speed reducer, (mixing) shaft, install seal assembly, impeller, shaft coupling, the extension connecting axle of being connected with (mixing) shaft one end in the bearing box, characterized by: the stirring impeller is respectively provided with connecting key grooves at an impeller mounting hole, a stirring shaft and a shaft extension part of an extension connecting shaft, the stirring impeller is respectively connected with the stirring shaft and the extension connecting shaft through keys, the other end of the stirring shaft is connected with the extension connecting shaft through a coupler, the stirring impeller takes the center of an impeller hub as a reference, bending blades are respectively arranged on one side of the impeller hub in an equally-spaced array manner, a connecting part of the bending blades is connected with one side of the impeller hub through a bolt made of 1.4529, the bending blades rotate along the stirring shaft and are sequentially contacted with the material, a first bending section, a second bending section, a third bending section and a fourth bending section are sequentially arranged, an included angle alpha is formed between the first bending section of the bending blades and a vertical surface vertical to the axis of the stirring shaft, an included angle beta is formed between the second bending section of the bending blades and the vertical surface, and an included angle gamma is formed between the third bending section of, an included angle theta is formed between the fourth bending section of the bending blade and the vertical surface, the inner layer of the bending blade is a substrate chip, through holes are uniformly distributed in the substrate chip, and the carbon fiber silicon carbide composite material layer is coated on the surface of the substrate chip through the through holes of the substrate chip.
2. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the value of the angle alpha is in the range of 10 degrees to 20 degrees.
3. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the value of the included angle beta is within the range of 20 degrees to 30 degrees.
4. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the value of the included angle gamma is within the range of 40 degrees to 50 degrees.
5. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the value of the angle theta is in the range of 50 degrees to 70 degrees.
6. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the thickness of the substrate chip is in the range of 4mm to 6 mm.
7. The carbon fiber silicon carbide composite material agitator of claim 1, wherein: the thickness of the carbon fiber silicon carbide composite material layer coated on the surface of the base material chip is within the range of 15mm-25 mm.
8. The carbon fiber silicon carbide composite stirrer according to claim 1, wherein: bending the blade-coated carbon fiber silicon carbide composite layer comprises the following steps,
firstly, construction preparation, wherein a construction scheme is drawn up, tools are prepared, and a silicon carbide ceramic material is prepared;
step two, mould pretreatment, namely cleaning the inner surface of the mould to ensure that the inner surface is clean and smooth, and then carrying out demoulding pretreatment to ensure that the mould is demoulded smoothly;
thirdly, pre-treating a base material chip of the bent blade, removing oil, dust and other loose materials on the surface, removing rust and water rust attached to the surface, and rolling the surface;
step four, assembling the die, namely putting the substrate chip of the bent blade into the die, and assembling the blade die;
and step five, stirring and mixing materials in vacuum, pouring the prepared silicon carbide material into vacuum stirring equipment, and stirring the silicon carbide ceramic material in vacuum for 30-120 min.
Step six, vibrating and casting ceramic, namely casting a mixed material and stirring a silicon carbide ceramic material into the combined mould; pouring while vibrating until the pouring is full;
seventhly, high-temperature curing treatment, namely putting the mold filled with the silicon carbide ceramic material into a heat treatment furnace, and adopting a secondary heating curing process, wherein the primary heating time is 30-60 min, the temperature is 60-80 ℃, the secondary heating time is 120-240 min, and the temperature is 120-160 ℃;
step eight, cooling treatment, namely cooling the die in a furnace cooling and air cooling mode, wherein the furnace cooling temperature range is 80-100 ℃, the furnace cooling time is 60-180 min, the air cooling environment temperature range is 10-25 ℃, and the air cooling time is 120-240 min;
step nine, removing the mold and cleaning, namely, after the mold components are disassembled in sequence, obtaining a bent blade carbon fiber silicon carbide composite material layer cleaning ceramic blade, and cleaning and smoothing the bent blade carbon fiber silicon carbide composite material layer;
and step ten, nondestructive testing, namely detecting the internal quality of the carbon fiber silicon carbide composite material by adopting ultrasonic flaw detection, having no defects such as air holes, slag inclusion, cracks and the like, and collecting the composite material after acceptance.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115406231A (en) * | 2022-09-13 | 2022-11-29 | 郑州恒生科技有限公司 | Boron-aluminum composite material recycling device and method |
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