Comprehensive utilization method of coal mine high-salt mine water for desert paddy field and mariculture water supply
阅读说明：本技术 用于沙漠水稻田及海产养殖供水的煤矿高含盐矿井水综合利用方法 (Comprehensive utilization method of coal mine high-salt mine water for desert paddy field and mariculture water supply ) 是由 潘磊 赵正佳 张鹏 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种用于沙漠水稻田及海产养殖供水的煤矿高含盐矿井水综合利用方法,属于矿井水处理及塌陷区生态治理技术领域,包括将煤矿高盐矿井水经混凝沉淀及RO膜过滤后,产生两股水,分别为淡水和浓盐水,将淡水用于养殖淡水鱼及灌溉沙漠水稻田,将浓盐水用于养殖海产品及藻类产品,不仅保护环境,且对煤矿高盐矿井水进行充分的利用,形成高附加值的经济产业,充分体现“伴生资源”得到资源化特性。(The invention discloses a comprehensive utilization method of coal mine high-salt mine water for desert paddy fields and marine product cultivation water supply, which belongs to the technical field of mine water treatment and subsidence area ecological management.)
1. A comprehensive utilization method of coal mine high-salt mine water for desert paddy fields and mariculture water supply is characterized by comprising the following steps:
s1: performing coagulating sedimentation on the mine water with high salt content, and then filtering the mine water with high salt content through an RO (reverse osmosis) membrane to respectively obtain fresh water and strong brine, wherein the salt content of the fresh water is not more than 200mg/L, and the salt content of the strong brine is not less than 30000 mg/L;
s2: introducing fresh water into a water sunning pool provided with an aeration system for culturing the freshwater fish;
s3: pumping fresh water in the sunning pond into a water delivery pipe or an irrigation channel through self-flowing or a water pump, wherein the water outlet end of the water delivery pipe or the irrigation channel is connected with the desert paddy field and is used for irrigating the desert paddy field; before the fresh water enters the desert paddy field, putting matched fertilizers into the desert paddy field according to the requirements of crops to prepare water-soluble fertilizers;
s4: introducing water in the desert paddy field into a water return tank to form water return, and dividing the water return into two parts, wherein one part of the water return is firstly introduced into an electrocatalytic oxidation reactor and then discharged into a sunning tank to form fresh water circulation; the other part of the drained water is discharged out of a water draining pool and is used for carrying out salinity and irrigating the greening of the street trees and the side slopes in the desert paddy field;
s5: introducing strong brine into a price-adjusting reaction tank, detecting the ion content in the strong brine, adding a conditioner into the price-adjusting reaction tank according to the ion content, stirring for more than 30 minutes, introducing the strong brine into a heavy metal removal reaction tank, adding modified diatomite, and stirring for more than 30 minutes to remove heavy metals in the strong brine; adjusting the quality of the strong brine to be suitable for aquaculture water for mariculture;
s6: pumping the culture water into a filter press for filtering, and then conveying the water into a culture pond for culturing marine products and recycling the marine products after treatment.
2. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 1, wherein a mixing section for uniformly mixing the fertilizer and the fresh water is arranged between the water outlet end of the water pipe or the irrigation channel and the desert paddy field, and the mixing section is a static mixer corresponding to the water pipe or a baffling type water channel corresponding to the irrigation channel.
3. The method for comprehensively utilizing mine water with high salt content in coal mines for desert paddy fields and mariculture water supply as claimed in claim 1, wherein water plants are planted in the water drying pool in the step S2.
4. The method for comprehensively utilizing the mine water with high salt content in the coal mine, which is used for the desert paddy field and the mariculture water supply, as claimed in claim 1, wherein an energy dissipation pool for performing energy dissipation and buffering on the fresh water output from the water delivery pipe or the irrigation channel is arranged between the water outlet end of the water delivery pipe or the irrigation channel and the desert paddy field.
5. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 1, wherein the step S6 comprises the following steps:
s61: the culture pond is communicated with the micro-filter, the electro-catalytic oxidation reactor and the contact oxidation pond in sequence through the irrigation channel, and a water outlet of the contact oxidation pond is connected with the culture pond and used for treating culture water and conveying the culture water back into the culture pond.
6. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 1, wherein the step S6 further comprises the following steps:
s62: introducing culture water in the culture pond into an algae pond for culturing algae to form algae liquid;
s63: preparing the algae liquid into an algae product after gravity separation and centrifugal separation, and inputting the separated water into the culture pond again.
7. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 1, wherein the method for laying the desert paddy field comprises the following steps:
and S31, digging planting pits (1) on the flat land. Laying a degradable lining film in the planting pit (1) to form an impermeable layer (2);
s32: covering raw sandy soil with the thickness of 10cm on the impermeable membrane to form a raw sandy soil layer (3);
s33: paving a diversion blind pipe (4) on the raw sand layer (3) to form a drainage layer;
s34: connecting the blind pipe (4) with a drainage well (5), and connecting the drainage well (5) with a drainage pool through the drainage blind pipe (4);
s35: and raw sandy soil with the thickness of 1 m is paved on the blind pipe (4) to form a planting layer (6).
8. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 7, wherein the area of the planting pit (1) in the step S31 is not more than 30 mu, and the depth is 1.3 m.
9. The method for comprehensively utilizing the mine water with high salt content in the coal mine for the desert paddy field and the mariculture water supply as claimed in claim 7, wherein the top of the drainage well (5) is higher than the water surface of the desert paddy field, and a liquid level adjusting sleeve (7) is arranged in the drainage well (5).
Technical Field
The invention belongs to the technical field of mine water treatment and subsidence area ecological management, and relates to a comprehensive utilization method of coal mine high-salt mine water for desert paddy fields and mariculture water supply.
Background
The problems of underground water resource loss caused by mine development and surface water body and environment pollution caused by mine water discharge are always one of the major problems which mine enterprises aim to solve and are also ecological environment sensitive problems which are extremely concerned by society. At present, the research on the comprehensive utilization of mine water in China is still in an exploration stage, the utilization rate of the mine water is low, and the treatment cost of the mine water with high mineralization and high suspended matter is high, so that most coal mines still directly discharge the mine water to cause environmental pollution.
Disclosure of Invention
The invention aims to provide a comprehensive utilization method of coal mine high-salt mine water for desert paddy fields and mariculture water supply, which has the advantages of treating the high-salt mine water and then recycling the mine water so as to protect the environment.
The above purpose is realized by the following technical scheme:
a comprehensive utilization method of mine water with high salt content in a coal mine comprises the following steps:
s1: performing coagulating sedimentation on the mine water with high salt content, and then filtering the mine water with high salt content through an RO (reverse osmosis) membrane to respectively obtain fresh water and strong brine, wherein the salt content of the fresh water is not more than 200mg/L, and the salt content of the strong brine is not less than 30000 mg/L; s2: introducing fresh water into a water sunning pool provided with an aeration system for culturing the freshwater fish; s3: pumping fresh water in the sunning pond into a water delivery pipe or an irrigation channel through self-flowing or a water pump, wherein the water outlet end of the water delivery pipe or the irrigation channel is connected with the desert paddy field and is used for irrigating the desert paddy field; before the fresh water enters the desert paddy field, putting matched fertilizers into the desert paddy field according to the requirements of crops to prepare water-soluble fertilizers; s4: introducing water in the desert paddy field into a water return tank to form water return, and dividing the water return into two parts, wherein one part of the water return is firstly introduced into an electrocatalytic oxidation reactor and then discharged into a sunning water tank to form water circulation; the other part of the drained water is discharged out of a water draining pool and is used for carrying out salinity and irrigating the greening of the street trees and the side slopes in the desert paddy field; s5: introducing strong brine into a price-adjusting reaction tank, detecting the ion content in the strong brine, adding a conditioner into the price-adjusting reaction tank according to the ion content, stirring for more than 30 minutes, introducing the strong brine into a heavy metal removal reaction tank, adding modified diatomite, and stirring for more than 30 minutes to remove heavy metals in the strong brine; adjusting the quality of the strong brine to be suitable for aquaculture water for mariculture; s6: pumping the culture water into a filter press for filtering, and then conveying the water into a culture pond for culturing marine products and recycling the marine products after treatment.
Preferably, a mixing section for uniformly mixing the fertilizer and the fresh water is arranged between the water outlet end of the water delivery pipe or the irrigation channel and the desert paddy field, and the mixing section is a static mixer corresponding to the water delivery pipe or a baffling type channel corresponding to the irrigation channel.
Preferably, in step S2, aquatic plants are planted in the pool.
Preferably, an energy dissipation pool for performing energy dissipation and buffering on the fresh water output from the water delivery pipe or the irrigation channel is arranged between the water outlet end of the water delivery pipe or the irrigation channel and the desert paddy field.
Preferably, the step S6 includes the following steps:
s61: the culture pond is communicated with the micro-filter, the electro-catalytic oxidation reactor and the contact oxidation pond in sequence through the irrigation channel, and a water outlet of the contact oxidation pond is connected with the culture pond and used for treating culture water and conveying the culture water back into the culture pond.
Preferably, the step S6 further includes the steps of:
s62: introducing culture water in the culture pond into an algae pond for culturing algae to form algae liquid; s63: preparing the algae liquid into an algae product after gravity separation and centrifugal separation, and inputting the separated water into the culture pond again.
Preferably, the method for paving the desert paddy field comprises the following steps:
s31, digging planting pits on the flat land, and paving a degradable lining film in the planting pits to form an impermeable layer; s32: covering raw sandy soil with the thickness of 10cm on the impermeable membrane to form a raw sandy soil layer; s33: paving a diversion blind pipe on the original sand layer to form a drainage layer; s34: connecting the blind pipe with a drainage well, and connecting the drainage well with a drainage pool through the drainage blind pipe; s35: and laying raw sandy soil with the thickness of 1 m on the blind pipe to form a planting layer.
Preferably, the planting pit area in the step S31 is not more than 30 mu, and the depth is 1.3 m.
Preferably, the top of the drainage well is higher than the water surface of the desert paddy field, and a liquid level adjusting sleeve is arranged in the drainage well.
Compared with the prior art, the invention has the following beneficial technical effects:
1. after coagulating sedimentation and RO membrane filtration are carried out on the high-salt mine water of the coal mine, as most of salt in the water can be separated, two streams of water are generated, namely fresh water and strong brine with the water production salt content generally less than 200 mg/L;
the fresh water which is subjected to coagulating sedimentation and RO membrane filtration is generally low in dissolved oxygen and unstable in temperature, so that the fresh water is introduced into a water drying pool to adjust the water temperature and increase the dissolved oxygen in the water, and the method can be used for culturing economic fresh water fish such as carps, grass carps and the like; in the raising process, the fish will produce excrement, the excrement and the feed residues can be used as organic fertilizers in the rice field, and fresh water which is cultured in the water-sunning pool and contains the excrement and the feed residues enters an irrigation channel or a water delivery pipe through a water pump or self-flowing mode and is introduced into the desert rice field for irrigating rice;
the strong brine generated by coagulating sedimentation and RO filtration belongs to the category of salt water, is different from seawater, and is related to geographical environment, geological soil, climate and the like due to the formation reason, so the chemical components of the strong brine are complex and various, compared with seawater, the proportion and the content of main ions in the water quality of different regions are greatly different, in addition, the buffering capacity of the water is poor, the constant proportion relation and the stable carbonate buffer system of the main components in the seawater quality are not provided, the ion content in the strong brine is detected, a conditioner is added for adjustment according to the requirement of the aquaculture water, and heavy metal ions in the strong brine are removed, so that the strong brine is suitable for the requirement of the aquaculture water for the cultured aquatic animals to form the aquaculture water, and then the aquaculture water is conveyed to an aquaculture pond for aquaculture marine products;
therefore, the environment is protected, the water of the high-salt mine of the coal mine is fully utilized, the economic industry with high added value is formed, and the resource recycling characteristic of 'associated resources' is fully reflected;
2. introducing water in a desert paddy field into a water returning pool to form water returning, dividing the water returning into two parts, introducing one part of the water returning into an electrocatalytic oxidation reactor for treatment, then discharging the treated water returning into a water sunning pool to form water circulation so as to avoid waste of water resources, and discharging the other part of the water returning out of the water returning pool for greening the side slope of street trees in the paddy field, and meanwhile, discharging part of the water returning to carry away salinity so as to maintain the salinity balance of the paddy field, wherein the salinity in the paddy field is maintained to be more than 1000 mg/L;
3. after the culture water is used for a period of time, a part of the culture water enters a micro-filter through a discharge channel, after excrement and food residues are separated by the micro-filter, the culture water enters an electrocatalytic oxidation reactor to decompose substances such as ammonia nitrogen and COD (chemical oxygen demand), then the culture water enters a contact oxidation pond, and after the contact oxidation treatment, the culture water is reused in the culture pond again, so that the cyclic utilization of the culture water is formed, the water is saved, the COD index and the ammonia nitrogen index of effluent can be effectively guaranteed, and the environment pollution is avoided; inputting the other part of the cultivation water into an algae pond, wherein the algae grows under the action of illumination by utilizing nutritive salts such as total nitrogen, total phosphorus and the like in water in the algae pond, further controlling the total nitrogen and the total phosphorus in the water, forming algae liquid after the algae in the cultivation water in the algae pond reaches a certain concentration, preparing algae products from the algae liquid through gravity separation and centrifugal separation, returning the separated water to the cultivation pond again, further improving the utilization rate of strong brine, forming the economic industry with high added value, fully embodying the associated resources to obtain the resource property, and discharging no sewage except the moisture carried by marine products and algae products in the whole treatment process, so that the method is completely recycled, and is more environment-friendly and saves water resources;
4. the biodegradable lining film is used for the anti-seepage layer of the desert paddy field, is more environment-friendly, and reduces the pollution to the environment.
Drawings
FIG. 1 is a flow chart of fresh water treatment according to a first embodiment of the present invention;
FIG. 2 is a flow chart of the treatment of concentrated brine in accordance with one embodiment of the present invention;
FIG. 3 is a schematic view showing the structure of a desert paddy field according to the present invention;
reference numerals: 1. planting pits; 2. an impermeable layer; 3. a raw sand soil layer; 4. a blind pipe; 5. a drainage well; 6. planting a layer; 7. a liquid level regulating sleeve.
Detailed Description
The present invention will now be described in further detail with reference to the following examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1 and 2, a method for comprehensively utilizing mine water with high salt content in coal mines, which is used for desert paddy fields and mariculture water supply, comprises the following steps:
s1: coagulating and precipitating the mine water with high salt content, filtering the mine water with high salt content through an RO (reverse osmosis) membrane, and separating most of salt in the mine water to obtain fresh water and strong brine respectively; wherein, the RO membrane is including being columniform ABS shell and the RO milipore filter core of concentric setting in the ABS shell, water inlet and strong brine discharge port have been seted up respectively to the both ends of ABS shell, the fresh water discharge port has then been seted up on the lateral wall of ABS shell, along with the input of high salt mine water, under the effect of pressure difference, the water molecule that partly is less than RO milipore filter core will see through between RO milipore filter core flows to ABS shell and the RO milipore filter core, it is discharged from the fresh water discharge port to form fresh water, and salt ion will be detained between RO milipore filter core because the particle diameter is greater than the membrane hole, mix and form strong brine in another part aquatic, discharge through the strong brine discharge port.
S2: introducing fresh water into a water drying pool, adjusting the water temperature, and increasing dissolved oxygen in the water to meet the condition of culturing the freshwater fish for culturing the freshwater fish; aquatic plants are planted in the sunning water tank for microorganisms to attach, and the microorganisms are utilized to degrade organic pollutants, ammonia nitrogen and total nitrogen pollutants generated by fish breeding.
S3: fresh water in the sunning pond is pumped into the water delivery pipe or the irrigation channel through self-flowing or a water pump, a desert paddy field is arranged at the water outlet end of the water delivery pipe or the irrigation channel, and an energy dissipation pond for dissipating and buffering the energy of the fresh water output in the water delivery pipe or the irrigation channel is arranged between the water delivery pipe or the irrigation channel and the desert paddy field, so that the paddy field is prevented from being directly washed. Thus, the fresh water containing the excrement and the feed residues due to the culture of the freshwater fish in the sunning water tank can be used for irrigating the desert paddy field;
wherein, an aeration device is arranged in the water sunning pool, the aeration device is a surface aerator or an aeration pipe and is used for providing dissolved oxygen for fishes to breathe in the water sunning pool, and simultaneously, the dissolved oxygen can also be used for the roots of the rice field to breathe after being irrigated into the desert rice field along with fresh water, so as to prevent root rot;
before pumping the fresh water to the desert paddy field, the water soluble fertilizer can be prepared according to the requirements of crops, and a static mixer or a baffling type canal is arranged between the sunning water pool and the water delivery pipe or the drainage canal, wherein the static mixer corresponds to the water delivery pipe, and the drainage canal corresponds to the baffling type canal, so that the water soluble fertilizer and the fresh water can be fully mixed. S4: introducing water in the desert paddy field into a water withdrawal tank to form water withdrawal, dividing the water withdrawal into two parts, introducing one part of the water withdrawal into an electrocatalytic oxidation reactor through a water pump, performing oxidation reaction by using electricity as a catalyst and hydrogen peroxide, oxygen, ozone and the like as oxidants to treat the water withdrawal, removing hormone substances in the water withdrawal, and then discharging the treated water withdrawal into a solarization tank to form fresh water circulation; the other part of the drained water is discharged out of a water outlet tank for street trees and slope greening in the rice field, and meanwhile, part of the drained water is discharged to carry away salt, so that the salt balance of the rice field is maintained, and the salt in the rice field is maintained below 1000 mg/L; wherein, be provided with the aeration pipe in the pond of moving back for continuously purifying moving back, the pond of moving back still is provided with bionical pasture and water filler simultaneously, is used for degrading the pheromone material in moving back, thereby reduces the influence of the partial moving back of discharge to the environment.
S5: introducing strong brine into the price-adjusting reaction tank, detecting the ion content in the strong brine, putting a conditioner into the price-adjusting reaction tank according to the ion content, and stirring for more than 30 minutes to adjust the water quality of the strong brine to be suitable for aquaculture water; then introducing the strong brine into a heavy metal removal reaction tank, adding modified diatomite, and stirring for more than 30 minutes to remove heavy metals in the strong brine;
wherein, the salinity proportion of the euryhaline aquatic products is as follows:
detecting each batch of inlet water, detecting the ion content in the water, adding a conditioner according to the requirement of the water for cultivation, and adjusting to meet the requirement of the water for the cultivated marine animals; wherein, the water quality ion indexes mainly comprise pH, K +, Na +, Ca2+, Mg2+, Cl-, SO42-, carbonate alkalinity and mineralization degree to be measured, and the comprehensive adjustment is carried out according to the result and the fed variety; the conditioner mainly comprises calcium chloride, potassium chloride, sodium bicarbonate, zeolite powder and the like.
S6: pumping the culture water into a filter press for filtering, transporting the filtered sludge and the like out, and then conveying the filtered sewage into a culture pond for culturing marine products.
The step S6 includes the following steps:
s61: the method comprises the following steps of connecting a culture pond with a micro-filter, an electro-catalytic oxidation reactor and a contact oxidation pond in sequence through an irrigation channel, wherein a water outlet of the contact oxidation pond is connected with the oxidation pond and used for treating culture water and conveying the culture water back into the culture pond to form strong brine circulation so as to save water; when the device is used, the culture water is conveyed into the micro-filter through the irrigation channel, excrement and food residues are separated, then the culture water is introduced into the electro-catalytic oxidation reactor to decompose substances such as ammonia nitrogen, COD (chemical oxygen demand) and the like, then the culture water is subjected to contact oxidation through the contact oxidation pond, and finally the treated culture water is conveyed back into the culture pond.
S62: and introducing the culture water in the culture pond into the algae pond for culturing algae to form algae liquid.
S63: preparing the algae liquid into an algae product after gravity separation and centrifugal separation, and inputting the separated water into the culture pond again.
The working principle of the embodiment is as follows: generally, the salt content of the coal mine high-salt mine water is 3000-10000 mg/L, and after the coal mine high-salt mine water is subjected to coagulating sedimentation and RO membrane filtration, most of salt in the water can be separated, so that two streams of water are generated, namely fresh water with the salt content generally less than 200mg/L and strong brine with the salt content more than 30000 mg/L;
the fresh water which is subjected to coagulating sedimentation and RO membrane filtration is generally low in dissolved oxygen and unstable in temperature, so that the fresh water is introduced into a water drying pool to adjust the water temperature and increase the dissolved oxygen in the water, and the method can be used for culturing economic fresh water fish such as carps, grass carps and the like; in the raising process, the fish will produce excrement, the excrement and the feed residues can be used as organic fertilizers in the rice field, and fresh water which is cultured in the water-sunning pool and contains the excrement and the feed residues enters an irrigation channel or a water delivery pipe through a water pump or self-flowing and then is introduced into the desert rice field for irrigating rice; introducing water in the desert paddy field into a water-returning pool to form water returning, dividing the water returning into two parts, introducing one part of the water returning into an electrocatalytic oxidation reactor to be treated, and then discharging the treated water returning into a sunning pool to form fresh water circulation, thereby avoiding waste of water resources.
The concentrated brine produced by coagulating sedimentation and RO filtration belongs to the category of salt water, is different from seawater, and is related to geographical environment, geological soil, climate and the like due to the formation reason, so the chemical components of the concentrated brine are complex and various, compared with seawater, the ratio and the content of main ions in the water quality of different regions are greatly different, in addition, the buffering capacity of water is poor, the constant ratio relation and the stable carbonate buffering system of the main components in the seawater quality are not provided, the ion content in the concentrated brine is detected, a conditioner is added according to the requirement of the aquaculture water for adjustment, the ion content and the pH value of the concentrated brine accord with the requirement of the aquaculture water, and in the case of excessive sulfate radicals and calcium chloride reacting to generate gypsum. According to the ion analysis of the water of the elm-erdos local high-salt mine, the average amount of calcium chloride added per ton of water is 5-15 kg, the average amount of potassium chloride is 0.2kg, and the average amount of sodium bicarbonate is 0.2 kg; then according to the heavy metal content in the local high-salinity mine water, 5-10 kg of modified diatomite is added into each ton of water, the water is rapidly stirred for more than 30 minutes, so that the strong brine meets the requirement of the water for the cultured aquatic animals to form culture water, and then the culture water is filtered by a plate-and-frame filter press and is conveyed into a culture pond for culturing marine products;
after the culture water is used for a period of time, a part of the culture water enters a micro-filter through a discharge channel, after excrement and food residues are separated by the micro-filter, the culture water enters an electrocatalytic oxidation reactor to decompose substances such as ammonia nitrogen and COD (chemical oxygen demand), then the culture water enters a contact oxidation pond, and after the contact oxidation treatment, the culture water is reused in the culture pond again, so that the cyclic utilization of the culture water is formed, the water is saved, the COD index and the ammonia nitrogen index of effluent can be effectively guaranteed, and the environment pollution is avoided; and inputting the other part of the culture water into an algae pond, wherein the algae grows under the action of illumination by utilizing nutrient salts such as total nitrogen, total phosphorus and the like in the water in the algae pond, further controlling the total nitrogen and the total phosphorus in the water, forming algae liquid after the algae in the culture water in the algae pond reaches a certain concentration, preparing an algae product after the algae liquid is subjected to gravity separation and centrifugal separation, returning the separated water to the culture pond again, and further improving the utilization rate of strong brine, so that the environment is protected, the high-salinity mine water in the coal mine is fully utilized, the high-added-value economic industry is formed, and the resource characteristic of associated resources is fully reflected.
The laying method of the desert paddy field comprises the following steps:
s31, digging planting pits 1 on the flat land, and paving a degradable lining film in the planting pits 1 to form an
S32: covering the impermeable membrane with original sandy soil with the thickness of 10cm to form an original sandy soil layer 3.
S33: and paving a diversion blind pipe 4 on the raw sand layer 3, wherein the diversion blind pipe 4 is made of plastic materials so as to form a drainage layer.
S34: connecting the blind pipe 4 with a
S35: and original sandy soil with the thickness of 1 m is paved on the blind pipe 4 to form a planting layer 6.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种可增加养殖密度提高产量的水产养殖模式