CN212396238U - Waste gas purification device for rubber glove oven production line - Google Patents
Waste gas purification device for rubber glove oven production line Download PDFInfo
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- CN212396238U CN212396238U CN201921675863.3U CN201921675863U CN212396238U CN 212396238 U CN212396238 U CN 212396238U CN 201921675863 U CN201921675863 U CN 201921675863U CN 212396238 U CN212396238 U CN 212396238U
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Abstract
The utility model discloses a rubber gloves oven production line exhaust gas purification device, including oil filter, oil smoke clarifier, photocatalyst apparatus, gas distribution device, peculiar smell controller and centrifugal fan, the end of giving vent to anger of oil filter with the inlet end of oil smoke clarifier is connected, the end of giving vent to anger of oil smoke clarifier with the inlet end of photocatalyst apparatus is connected, the end of giving vent to anger of photocatalyst apparatus with the inlet end of gas distribution device is connected, the gas distribution device with the peculiar smell controller passes through the trachea intercommunication, the end of giving vent to anger of gas distribution device with centrifugal fan's inlet end intercommunication. The utility model discloses a rubber gloves oven production line exhaust gas purification device can have corresponding to the diversity of waste gas, variability, the pollution concentration height and handle characteristics such as the amount of wind is big, has corresponding selection processing technology to guarantee waste gas after, can discharge to reach standard.
Description
Technical Field
The utility model relates to a rubber gloves oven production line exhaust-gas treatment technical field, concretely relates to rubber gloves oven production line exhaust purification device.
Background
The pollution factors of the rubber glove oven exhaust gas are oil smoke, industrial oil, benzene, toluene, xylene, non-methane total alkane, stink and other pollutants. The generated waste gas has high temperature, large pollution, large discharge amount and complex and variable pollution components, particularly, the foul components in the waste gas easily cause great pollution to the surrounding environment and the plant area environment, and the phenomenon of disturbing residents is difficult to avoid.
Generally, the exhaust gas exists in three forms, namely solid, liquid and gaseous, and more in gaseous form. In recent years, domestic advanced technologies are vigorously developed and actively introduced, and the overall structure of the environmental protection industry is gradually improved. Especially, the treatment technology of waste gas and malodorous gas has more advanced development and wide application. At present, the odor treatment technologies applied at home and abroad mainly include a dry neutralization method, a composite photocatalysis method, an ion deodorization method, an absorption method, an adsorption method, a microbial degradation method, a composite active oxygen method, a micronutrient element decomposition method, a combustion method, a condensation method and the like.
However, in the case of exhaust gas having a complicated composition and a high concentration, it is difficult to perform purification treatment by a certain process or apparatus alone.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a waste gas purification device for a rubber glove oven production line, which can better purify waste gas with medium and high concentration.
The waste gas purification device for the rubber glove oven production line comprises an oil filter, an oil fume purifier, a photocatalyst, a gas distribution device, an odor controller and a centrifugal fan, wherein the gas outlet end of the oil filter is connected with the gas inlet end of the oil fume purifier, the gas outlet end of the oil fume purifier is connected with the gas inlet end of the photocatalyst, the gas outlet end of the photocatalyst is connected with the gas inlet end of the gas distribution device, the gas distribution device is communicated with the odor controller through a gas pipe, and the gas outlet end of the gas distribution device is communicated with the gas inlet end of the centrifugal fan.
Specifically, the oil filter is a suction filter type oil filter.
Specifically, the oil fume purifier is an electrostatic oil fume purifier.
Specifically, the photocatalyst is a composite photocatalyst.
Specifically, the centrifugal fan is a medium-low pressure centrifugal fan.
Specifically, the air outlet end of the centrifugal fan is connected with a height-leading discharge pipeline.
Specifically, the oil fume purifier comprises a dehydration demisting device.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a rubber gloves oven production line exhaust gas purification device can have corresponding to the diversity of waste gas, variability, the pollution concentration height and handle characteristics such as the amount of wind is big, has corresponding selection processing technology to guarantee waste gas after, can discharge to reach standard.
The waste gas purification device for the rubber glove oven production line further has the following characteristics:
1. the process waste gas purification device of the rubber glove oven production line is convenient to install and occupies small area on site;
2. the operation process of the waste gas purification device is safe, stable and reliable, and the operation and the maintenance are convenient;
3. the multiple treatment processes are combined into integrated equipment, and the supported waste gas concentration and component load are large;
4. the targeted selection treatment process for the components of the waste gas can better control the operation and maintenance cost of the system;
5. the equipment is made of stainless steel, so that the appearance and the service life of the system are ensured to the maximum extent;
6. the tail end of the waste gas treatment system is designed with a dry neutralization method (industrial deodorization membrane), which not only ensures the cost index of the discharged waste gas, but also can effectively control the odor concentration of the discharge outlet.
Drawings
FIG. 1 is a structural view of an exhaust gas purification device in a rubber glove oven production line;
in the figure: 1. an oil filter; 2. a lampblack purifier; 3. a photocatalyst; 4. a gas distribution device; 5. a odor controller; 6. a centrifugal fan.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Rubber gloves oven production line exhaust gas purification device, including oil filter 1, oil smoke clarifier 2, photocatalyst apparatus 3, gas distribution device 4, peculiar smell controller 5 and centrifugal fan, the end of giving vent to anger of oil filter 1 is connected with the inlet end of oil smoke clarifier, the end of giving vent to anger of oil smoke clarifier is connected with the inlet end of photocatalyst apparatus 3, the end of giving vent to anger of photocatalyst apparatus 3 is connected with the inlet end of gas distribution device 4, gas distribution device 4 passes through the trachea intercommunication with peculiar smell controller 5, the end of giving vent to anger of gas distribution device 4 communicates with the inlet end of centrifugal fan.
Specifically, the oil filter 1 is a suction filter type oil filter, and functions to remove smoke and oil having a large particle size in exhaust gas. The core of the filter type oil filter is a suction filter chip which is a special filtering and adsorbing material, the shell is made of high-temperature-resistant and corrosion-resistant SUS304, an internal filter core chip adopts an alloy wire filter material, and the inside of the filter chip is a special unit with extremely fine gaps and designed in a labyrinth honeycomb manner, is in a three-dimensional net structure, has the characteristics of higher porosity (more than 95%), good tensile strength and moderate pore size, thereby reducing flow resistance, increasing the storage capacity of oil and effectively solving the contradiction between purification and ventilation. When waste gas of oily aerosol particles passes through, the waste gas collides with the purification filter element sheet, large oily particles are adhered to the surface of the filter element sheet, most oily particles are adsorbed on the filter element sheet when the waste gas passes through the filter element, and residual oily molecules of fine particles are rapidly collided for many times due to rapid time change of filtering speed when passing through the inside of the labyrinth and superfine gap chip, and the oily molecules of the fine particles are adhered to the wall of the chip and are settled under the action of gravity in the advancing process of air flow to be purified.
Specifically, the oil fume purifier 2 is an electrostatic oil fume purifier, and is used for removing the fume and oil with medium and small particle sizes in the exhaust gas. The working principle of the electrostatic oil fume purifier is as follows: the electrostatic oil fume purifier is one new type of oil fume purifier with high efficiency ionizing purification technology. Generally consists of three parts, namely a preposed filter screen, high-pressure ionization and low-pressure adsorption. The large oil drops entering the electrostatic oil smoke purifier are intercepted and are used as a pretreatment part, so that the concentration of the oil smoke particles entering an electric field part is reduced. The electrostatic oil fume purifier is internally provided with a multi-stage high-voltage electrostatic field consisting of a cathode and an anode, wherein the cathode is a linear electrode with a small curvature radius, the anode has a large curvature radius, and a direct-current high voltage is added between the two electrodes. However, under the action of external energy, the gas can be ionized to emit electrons to become positive and negative ions, the gas passes through an electric field with the radius of curvature greatly different from each other, and when the electric field intensity is high enough, avalanche effect can occur to the stubborn body ions near the surfaces of the electrodes, the recombination process is particularly violent, the distance between the surfaces of the two electrodes is gradually increased, along with the increase of the distance between the surfaces of the two electrodes, the electric field intensity is rapidly reduced, the ion moving speed is reduced, the gas space is not broken down to cause the breakdown of the whole space, and in a high-voltage ionization region, the corona discharge is caused by the uneven electric field. The flue gas passes through the high-voltage ionization region, because the high-voltage electric field constantly produces corona discharge, and a large amount of anions move to positive from the negative pole under the effect in the electric field, make flue gas particle electrified, and the adsorption loses the electric charge on the anode plate, and the flue gas after the separation gathers into oil and drips, and the oil drips through gravity and falls into the device bottom and concentrate and collect. Meanwhile, in an ionization region, negative ions are mainly oxygen ions, after the oxygen ions capture oil fume particles, oil in cooking is mainly animal and vegetable unsaturated fatty acids, the molecular formula of the main component is C18H1402, and the negative ions are combined with H, C to generate harmless substances such as H2O, C, CO2 and the like, and the harmless substances are discharged through airflow. The fragrant smell in cooking is also a hydrocarbon component. Due to the combination of oxygen ions, part of fume odor can be converted into odorless gas to be discharged, so that part of fume odor in cooking can be eliminated in a limited way.
Specifically, the electrostatic oil fume purifier includes a dewatering defogging device (not shown) therein, which is used for removing moisture and humidity from the exhaust gas. The working principle of the dewatering and demisting device is as follows: when the mist-laden gas rises through the spray scrubbing layer at a certain speed, the mist collides with the chemical scrubbing layer and is attached to the surface of the chemical scrubbing layer due to the inertia effect of the rising mist. The dispersion of the mist on the surface of the chemical cleaning layer and the gravity sedimentation of the mist enable the mist to form larger liquid drops which flow to the junction of the two filaments along the chemical cleaning layer. The wettability of the chemical washing layer, the surface tension of the liquid and the capillary action of the chemical washing layer enable the liquid drops to be larger and larger, and the liquid drops are separated from the chemical washing layer and fall down until the gathered liquid drops are large enough that the gravity generated by the liquid drops exceeds the resultant force of the rising force of the gas and the surface tension of the liquid. The gas is substantially free of entrainment after passing through the chemical scrubbing unit. The mist in the gas is separated to improve the operation condition, optimize the process index, reduce the corrosion of the equipment, prolong the service life of the equipment, increase the treatment capacity, recover valuable materials, protect the environment, reduce the atmospheric pollution and the like. The structure is simple, the volume is small, the efficiency of dust removal and dehydration is high, the resistance is small, the weight is light, the installation, the operation and the maintenance are convenient, and the collection efficiency of the chemical washing device reaches 98 to 99.8 percent for the mist with the particle size of more than or equal to 3 to 5 um.
Specifically, the photocatalyst 3 is a composite photocatalyst which functions to remove components having a small molecular weight and an unstable structure. The working principle of the composite photocatalyst is as follows: the composite photocatalysis device is divided into an efficient pretreatment section and a composite photocatalysis section which are usually integrated, so that the occupied area and the installation workload can be effectively reduced. The high-efficiency pretreatment section is mainly formed by combining modularized professional composite fibers and mainly used for treating each component of waste gas so as to adsorb and remove harmful chemical gas in the waste gas, reduce the pressure of rear-end treatment and improve the waste gas treatment efficiency. Ultraviolet lamp with specific wavelength is used as light energy donor for photocatalytic oxidation, and the photocatalyst nano particle can be excited to generate electron-hole pair and hole decomposing catalyst under the irradiation of ultraviolet light with certain wavelength. The photocatalytic oxidation of TiO2 is a result of the interaction of active hydroxyl groups (. OH) with other active oxidizing species (. O2-,. OOH, H2O 2). The OH groups generated on the surface of Ti02 have high reactivity and higher reaction energy than that of various chemical bond energies in organic substances, and can quickly and effectively decompose the organic substances by the synergistic effect of O2-,. OOH and H2O2 active oxidation substances.
Specifically, the centrifugal fan is a medium-low pressure centrifugal fan, and the function of the centrifugal fan is to suck waste gas.
Specifically, the air outlet end of the centrifugal fan is connected with a height-leading discharge pipeline.
Specifically, the gas distribution device 4 is used for removing volatile molecules with low molecular weight. The working principle of the gas distribution device is as follows: the dry neutralization method mainly uses a Vaportek odor controller as a core device and a Vaportek deodorization membrane as a main deodorization unit. Odor removing particles are uniformly distributed on the surface of the membrane through VP, and the odor is rapidly removed by utilizing the air convection power, and meanwhile, other external substances cannot be sucked, so that the naturalness of the plant extracting solution is kept forever. The deodorizing particles in the waste gas can quickly and actively capture the odor gas molecules in the air and wrap the odor particles. The common odor molecules are mostly small molecular organic matters (esters, alcohols, aromatic hydrocarbons and the like), and also comprise part of inorganic small molecules such as ozone, ammonia, hydrogen sulfide, hydrocarbons and the like, and the odor molecules have high activity on the surface of olfactory cells and strong irritation, and still have strong olfactory pollution capacity even under the premise that the concentration of each odor component reaches the standard and is discharged, namely the odor molecules have the characteristics of low pollution concentration and high odor intensity. Vaportek particles are natural oily deodorized molecules, and the particles are in non-covalent combination with odor molecules through intermolecular nonpolar interaction, so that the molecules are greatly stabilized, and the activity and the irritation of the molecules are reduced. Further, the increase in specific gravity after the binding is solved by the sedimentation effect. The process is different from chemical reaction process to generate a third substance and masking effect, does not cause secondary pollution, and can thoroughly remove odor.
Before the purification work is carried out, the waste gas of each post of rubber gloves oven production line is controlled in fixed region by gas collecting channel and collection tuber pipe, is sent to each exhaust-gas treatment unit under centrifugal fan's effect and purifies, and its specific process is:
the first step is as follows: the combined waste gas is sent to a suction filter for primary treatment under the action of a suction port, a conveying air pipe and a fan. When the waste gas containing oil aerosol particles passes through, the waste gas collides with the surface of the perforated box and the surface of the filter element plate of the suction filter type oil filter module, large oily particles are adhered to the surface of the perforated box and the surface of the filter element plate, and oil-gas separation is realized, so that purification is realized (the main function is to reduce the concentration of removing oil smoke and grease in the waste gas).
The second step is that: the waste gas after passing through the suction filter type oil filter still contains more oil smoke components. At this time, the exhaust gas containing oil smoke is sent into the electrostatic oil smoke purifier, and part of oil mist droplets and oil stain particles are collected on the flow equalizing plate. When the tiny oil enters a high-voltage electrostatic field, oil-gas separation is realized under the action of the high-voltage electrostatic field, part of the tiny oil is degraded into carbon dioxide and water, and finally clean air is discharged (the main function is to remove oil smoke and grease in waste gas).
The third step: the waste gas through the processing of electrostatic oil smoke clarifier, because the air current in the equipment is great relatively, the oil mist that separates high-voltage electric field easily gets into away for waste gas still is in the gas-liquid mixture state, for avoiding influencing next processing workshop section, must remove most steam in the gas through the processing of high-efficient dehydration dehumidification layer. Due to the inertia effect of the rising of the waste gas, the water vapor collides with the dehydration layer and is attached to the surface, so that the liquid drops are larger and larger, and the gravity sedimentation is achieved. (the main function is to intercept floccules in the gas and remove most of water vapor and oil mist particles in the gas);
the fourth step: the photocatalytic oxidation of the dehydrated exhaust gas to form TiO2 under the lamp irradiation of the high-energy ultraviolet lamp beam is the result of the combined action of active hydroxyl groups (. OH) and other active oxidizing species (. O2-,. OOH, H2O 2). OH groups generated on the surface of TiO2 have high reactivity and higher reaction energy than various chemical bond energies in organic matters, and can quickly and effectively decompose the organic matters by the synergistic effect of O2-,. OOH and H2O2 active oxidation substances. (main function: removing easily decomposed and oxidized exhaust gas components (benzene, toluene, xylene, non-methane total hydrocarbons, VOCs, etc. and having good disinfection and deodorization effects) in a part of the exhaust gas;
the fifth step: the smoke subjected to the previous multi-stage treatment still has the biggest problem of odor pollution. At the moment, the advanced deodorization technology of America introduced by the company is adopted, the VP odor control box is arranged in a pipeline between an air outlet of the terminal treatment device and a chimney, and the deodorization micro-particles in the odor control box are taken away by means of negative pressure generated by the system, so that odor gas molecules in the air are rapidly and actively captured, and the odor particles are wrapped. Vaportek particles are natural oily deodorizing molecules, and the particles are in non-covalent combination with odor molecules through intermolecular nonpolar interaction, so that the molecules are greatly stabilized, the activity and the irritation of the molecules are reduced, and the odor is thoroughly removed. (main function: removal of malodors in exhaust gas to the point of emission).
And a sixth step: the treated waste gas reaching the standard is discharged by being led to a height of more than 15 meters through a chimney.
The utility model discloses a rubber gloves oven production line exhaust gas purification device can have corresponding to the diversity of waste gas, variability, the pollution concentration height and handle characteristics such as the amount of wind is big, has corresponding selection processing technology to guarantee waste gas after, can discharge to reach standard.
The waste gas purification device for the rubber glove oven production line further has the following characteristics:
1. the process waste gas purification device of the rubber glove oven production line is convenient to install and occupies small area on site;
2. the operation process of the waste gas purification device is safe, stable and reliable, and the operation and the maintenance are convenient;
3. the multiple treatment processes are combined into integrated equipment, and the supported waste gas concentration and component load are large;
4. the targeted selection treatment process for the components of the waste gas can better control the operation and maintenance cost of the system;
5. the equipment is made of stainless steel, so that the appearance and the service life of the system are ensured to the maximum extent;
6. the tail end of the waste gas treatment system is designed with a dry neutralization method (industrial deodorization membrane), which not only ensures the cost index of the discharged waste gas, but also can effectively control the odor concentration of the discharge outlet.
It should be noted that the odor controller 5 in this embodiment may adopt the technical solution described in chinese patent CN202113746U, and on the basis of the above technical solution, the odor controller may be mechanically connected to other components of the present application without creative work. The principles of the odor controller 5 and its specific structure are not the subject of the claims of this patent application. The odor controller 5 is prior art, and does not relate to the technical features of the present application that are different from the prior art, so the present embodiment does not describe the specific structure of the odor controller 5. The technical solutions, the expected technical effects and the technical problems to be solved of the present application will be fully apparent to those skilled in the art from the cited patents related to the above odor controller 5 and the description of the present specification. The odor controller 5 is a releasing amount control carrier of the deodorizing membrane developed according to the characteristics and performance of the deodorizing membrane and combining the actual conditions of various application occasions. The deodorization mechanism of the product is as follows: by means of airflow power, VP microparticles with neutralization and deodorization effects are permeated and released from the dialysis membrane. The VP microparticles dispersed in the air can capture and wrap the malodorous molecules in the air. Since the coated particles have a higher specific gravity than air, they fall to the ground and naturally deteriorate over time. This process is not a chemical reaction nor is a third species formed. The peculiar smell controller 5 is different from common covering and odor shielding, is novel environment-friendly equipment which is available on the market at present, can effectively deodorize, has no toxic or side effect and has low investment cost.
It should be noted that, the suction-filtration oil filter in this embodiment may adopt a technical scheme described in one of chinese patents CN208381037U, CN203750251U, CN200975380Y, CN200975380Y, CN2163681Y, CN2173320Y, and CN86210144U, and may be mechanically connected to other components in the present application scheme without creative work based on the technical scheme. The principle of suction filter type oil filters and their specific structure are not the subject of the claims of this patent application. The suction filter type oil filter is a prior art, and does not relate to the technical features of the present application that are different from the prior art, and thus the present embodiment does not describe a specific structure of the suction filter type oil filter. The technical solution, the intended technical effects achieved and the technical problems solved by the present invention will be fully apparent to those skilled in the art from the cited patents related to the suction filter oil filter and the description of the present specification.
It should be noted that, the electrostatic oil fume purifier in this embodiment may adopt a technical solution described in one of chinese patents CN110170380A, CN109821656A, CN110116052A, CN208727748U, CN209061386U, and CN208161823U, and may be mechanically connected to other components of the present application without creative work based on the technical solution. The principles of electrostatic oil smoke purifiers and their specific structures are not the subject of the claims of this patent application. The electrostatic oil fume purifier is taken as the prior art, and the technical features of the present application which are different from the prior art are not referred to, so the present embodiment does not describe the specific structure of the electrostatic oil fume purifier. The technical solutions, the expected technical effects and the technical problems to be solved of the present application will be fully apparent to those skilled in the art from the cited patents related to the above electrostatic oil fume purifier and the description of the present specification.
It should be noted that the composite photocatalyst in this embodiment may adopt a technical scheme described in one of chinese patents CN204034562U and CN202265431U, and on the basis of the technical scheme, the composite photocatalyst may be mechanically connected to other components in the scheme of the present application without creative work. The principle of the composite photocatalyst and its specific structure are not the subject of the claims of this patent application. The composite photocatalyst is taken as the prior art, and does not relate to the technical features of the present application which are different from the prior art, so the present embodiment does not describe the specific structure of the composite photocatalyst. The technical solution, the expected technical effect and the technical problem to be solved by the present application will be fully apparent to those skilled in the art from the cited patents related to the composite photocatalyst and the description of the present specification.
It should be noted that, the middle and low pressure centrifugal fan 6 in this embodiment may adopt a technical scheme described in one of chinese patents CN209145933U, CN209324700U, CN209261924U, and CN208918867U, and may be mechanically connected to other components in the present application scheme without modification of creative labor based on the technical scheme. The principle of the medium and low pressure centrifugal fan 6 and its specific structure are not the subject of the claims of this patent application. The medium-low pressure centrifugal fan 6 is a prior art, and does not relate to the technical features of the present application that are different from the prior art, and therefore the present embodiment does not describe the specific structure of the medium-low pressure centrifugal fan 6. According to the cited patents related to the middle-low pressure centrifugal fan 6 and the description of the specification, the technical scheme, the expected technical effect and the solved technical problem of the application can be completely clarified by the technical personnel in the field.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (7)
1. Rubber gloves oven production line exhaust gas purification device, its characterized in that: the oil smoke purifier comprises an oil filter, an oil smoke purifier, a photocatalyst, a gas distribution device, a peculiar smell controller and a centrifugal fan, wherein the gas outlet end of the oil filter is connected with the gas inlet end of the oil smoke purifier, the gas outlet end of the oil smoke purifier is connected with the gas inlet end of the photocatalyst, the gas outlet end of the photocatalyst is connected with the gas inlet end of the gas distribution device, the gas distribution device is communicated with the peculiar smell controller through a gas pipe, and the gas outlet end of the gas distribution device is communicated with the gas inlet end of the centrifugal fan.
2. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: the oil filter is a suction filter type oil filter.
3. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: the oil fume purifier is an electrostatic oil fume purifier.
4. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: the photocatalyst is a composite photocatalyst.
5. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: the centrifugal fan is a medium-low pressure centrifugal fan.
6. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: and the air outlet end of the centrifugal fan is connected with a height-leading discharge pipeline.
7. The exhaust gas purification device for rubber glove oven production line according to claim 1, characterized in that: the oil fume purifier comprises a dehydration and demisting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921675863.3U CN212396238U (en) | 2019-09-30 | 2019-09-30 | Waste gas purification device for rubber glove oven production line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921675863.3U CN212396238U (en) | 2019-09-30 | 2019-09-30 | Waste gas purification device for rubber glove oven production line |
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| CN212396238U true CN212396238U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921675863.3U Active CN212396238U (en) | 2019-09-30 | 2019-09-30 | Waste gas purification device for rubber glove oven production line |
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| CN (1) | CN212396238U (en) |
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