CN105044289B - The detection device and method of release flue gas when a kind of precoated sand coremaking or casting - Google Patents
The detection device and method of release flue gas when a kind of precoated sand coremaking or casting Download PDFInfo
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- CN105044289B CN105044289B CN201510458703.3A CN201510458703A CN105044289B CN 105044289 B CN105044289 B CN 105044289B CN 201510458703 A CN201510458703 A CN 201510458703A CN 105044289 B CN105044289 B CN 105044289B
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Abstract
The detection device and method of flue gas are discharged the present invention relates to foundry industry technical field, more particularly to when a kind of precoated sand coremaking or casting.Wherein, the detection device of flue gas is discharged when precoated sand coremaking or casting that the present invention is provided, including smoke generating apptss and smoke circulating device, smoke generating apptss and smoke circulating device connect and compose closed-loop path by pipeline, gas sensor is set on pipeline simultaneously, heated by the way that precoated sand is put into smoke generating apptss, to simulate the environment of coremaking and casting, the composition and the concentration of flue gas for the flue gas that precoated sand is produced in coremaking and casting are detected by the gas sensor set on pipeline simultaneously, compared with the method measured using spectrophotometer, measurement more comprehensive precise and high efficiency of the device that the application is provided to flue gas composition and concentration；The flue gas in pipeline is driven to circulate additionally by smoke circulating device, the flue gas concentration of each several part is uniform in pipeline, and the result of measurement is more accurate, and measurement efficiency is higher.
Description
Technical field
The detection of flue gas is discharged the present invention relates to foundry industry technical field, more particularly to when a kind of precoated sand coremaking or casting
Device and method.
Background technology
It is also continuous to the environmental protection characteristic of existing casting auxiliary material with the development that deepens continuously of casting industry Green Process
Challenge, precoated sand endangers the generation of flue gas when having good low odor profiles and high temperature casting under coremaking temperature conditionss
Rate, can so improve the working environment of coremaking workshop and the shop worker that casts；It is being required to meet existing core manufacturing craft
On the basis of, the gasification object amount of unwanted volatile is reduced, to reduce the pollution to environment.
Precoated sand would generally discharge the harmful substances such as ammonia, formaldehyde, phenol during coremaking or casting, and these are harmful to
Material is evaporate into air, and the healthy of workman is caused harm, while pollution environment that can be serious；In casting or coremaking
The harmful substance remained on Cheng Zhong, precoated sand can be evaporated further, the yield rate of casting be influenceed, while being caused to environment
Serious pollution, especially oxynitrides, excessive excessive discharge can cause photochemical fog, and the final harm mankind's is strong
Health.
At present, for the quality of precoated sand, common concern be the intensity of precoated sand, get angry, the index such as burning decrement, it is right
The flue gas characteristic discharged during coremaking lacks effective detection means, and part resin processing plant, which uses flue gas being passed through in water, inhales
Receive, the content of ammonia and formaldehyde-phenol is then tested using the method for spectrophotometer.
The content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is：Lack at present for detecting that precoated sand discharges the characteristic of flue gas in coremaking
Apparatus and method, and be merely able to measure a small number of several flue gases such as ammonia, formaldehyde and phenol using spectrophotometer measurement, survey
Amount has some limitations, and measurement efficiency is relatively low.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides the detection that flue gas is discharged when a kind of precoated sand coremaking or casting
Equipment, including smoke generating apptss and smoke circulating device, the smoke generating apptss and smoke circulating device are suitable by pipeline
Secondary connection forms closed-loop path, and the smoke circulating device is used to drive flue gas recirculation in pipeline to flow, set on the pipeline
There is gas sensor, the gas sensor is used for the composition and the concentration of flue gas of flue gas in signal piping.
Wherein, the smoke generating apptss are to be provided with what is be connected respectively with the pipeline on tube furnace, the tube furnace
Escape pipe and muffler；Charge door is additionally provided with the muffler.
Wherein, the smoke circulating device is oilless vacuum pump.
Wherein, the pipeline includes the first pipeline, the second pipeline, the 3rd pipeline and the 4th pipeline, first pipeline
One end is connected with the muffler, and the other end is connected by the first triple valve with the second pipeline, one end of the 4th pipeline with
The escape pipe connection, the other end is connected by the second triple valve with the 3rd pipeline, the suction end of the oilless vacuum pump
It is connected with the 3rd pipeline, exhaust end is connected with the second pipeline；The gas sensor is arranged on the second pipeline.
Wherein, it is provided with dust removal by filtration mechanism in the 4th pipeline.
Wherein, the dust removal by filtration mechanism is glass fiber mesh.
Wherein, condenser is additionally provided with the 4th pipeline, and the condenser is located at dust removal by filtration mechanism and second
Between triple valve.
Wherein, drying tube is provided with second pipeline, the drying tube is located at oilless vacuum pump and air borne sensor
Between.
Wherein, spinner flowmeter is additionally provided with second pipeline, the spinner flowmeter is located at drying tube and first
Between triple valve.
Present invention also offers the detection method that flue gas is discharged when a kind of precoated sand coremaking or casting, comprise the following steps：
S1, opens tube furnace switch, is warming up to preset temperature；
S2, the first triple valve of regulation and the second triple valve, make to constitute between smoke generating apptss and smoke circulating device and close
Close loop；
S3, sand sample is put into smoke generating apptss and heated 2-10 minutes；
S4, starts the flue gas produced in smoke circulating device, driving smoke generating apptss and is flowed in pipeline；
Record data after S5, the numerical stability shown on gas sensor；
S6, the first triple valve of regulation and/or the second triple valve, the fume emission in pipeline is gone out, makes gas sensor
Zero.
(3) beneficial effect
The above-mentioned technical proposal of the present invention has the following advantages that：The invention provides discharged when a kind of film sand coremaking or casting
The detection device of flue gas, including smoke generating apptss and smoke circulating device, smoke generating apptss and smoke circulating device pass through
Pipeline connects and composes closed-loop path, while gas sensor is set on pipeline, by the way that precoated sand is put into smoke generating apptss
Interior heating, environment during simulating precoated sand coremaking and casting, while being covered by the gas sensor set on pipeline to detect
The composition and the concentration of flue gas for the flue gas that film sand is produced in coremaking and casting, with measuring for traditional use spectrophotometer
Method is compared, and it is higher that the device that the application is provided measures flue gas composition more comprehensive accurate, measurement efficiency；Further, since whole
The flue gas concentration that individual device is constituted in a closed-loop path, pipeline is uniform, and it is more accurate to measure, while can also be followed by flue gas
Air circulation in loop device driving pipeline, is further mixed, it is ensured that the cigarette of each several part in pipeline to the flue gas in pipeline
Gas is evenly distributed, and further improves the accuracy of measurement
Brief description of the drawings
Above-mentioned and/or additional aspect the advantage of the present invention will be apparent from description of the accompanying drawings below to embodiment is combined
Be readily appreciated that, wherein：
The schematic diagram of the detection device of release flue gas when Fig. 1 is the coremaking of film sand or casting described in the embodiment of the present invention.
Wherein, the corresponding relation in Fig. 1 between reference and component names is：
1st, tube furnace, 11, escape pipe, 12, muffler, 13, charge door, 2, oilless vacuum pump, 21, suction end, 22, exhaust
End, the 3, first pipeline, the 31, first triple valve, the 4, second pipeline, 41, gas sensor, 42, spinner flowmeter, 43, drying tube,
5th, the 3rd pipeline, the 51, second triple valve, the 6, the 4th pipeline, 61, condenser, 62, dust removal by filtration mechanism, 63, temperature sensor.
Embodiment
In the description of the invention, it is necessary to explanation, term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
"front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " " interior ", the orientation of the instruction such as " outer " or position relationship
For based on orientation shown in the drawings or position relationship, be for only for ease of description the present invention and simplify description, rather than indicate or
Specific orientation must be had, with specific azimuth configuration and operation by implying the device or element of meaning, therefore it is not intended that
Limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying phase
To importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.In addition, in the description of the invention, unless otherwise indicated, " multiple " are meant that two or two
More than.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
As shown in figure 1, the invention provides the detection device that flue gas is discharged when a kind of precoated sand coremaking or casting, including cigarette
Gas generating means and smoke circulating device, the smoke generating apptss and smoke circulating device are sequentially connected with to be formed by pipeline to be closed
Loop is closed, the smoke circulating device is used to drive flue gas recirculation in pipeline to flow, gas sensor is provided with the pipeline
41, the gas sensor 41 is used for the composition and the concentration of flue gas of flue gas in signal piping.
The detection device of flue gas, including smoke generating apptss and flue gas are discharged when the coremaking of film sand or casting that the present invention is provided
EGR, smoke generating apptss and smoke circulating device connect and compose closed-loop path by pipeline, while being set on pipeline
Gas sensor 41, is heated by the way that precoated sand is put into smoke generating apptss, to simulate under coremaking and cast temperature, precoated sand
Burning or the environment of heating, and the air circulation in pipeline is driven by smoke circulating device, it is ensured that promote each portion in pipeline
The flue gas concentration divided is uniform, while detecting that precoated sand is produced in coremaking and casting by the gas sensor 41 set on pipeline
Flue gas composition and the concentration of flue gas, gas sensor 41 can measure the scope of flue gas it is wider (phenol, formaldehyde, an oxidation
Carbon, carbon dioxide, ammonia, styrene, benzene, dimethylbenzene, oxynitrides, etc. flue gas concentration detection), with spectrophotometer
Method is compared, and its measurement to flue gas composition and concentration is more comprehensively accurate；Testing agency that the present invention is provided is simple in construction, survey
Amount is more prone to, measurement it is more efficient.And the flue gas concentration constituted due to whole device in a closed-loop path, pipeline is equal
Even, it is more accurate to measure, and measurement efficiency is higher.
Preferably, the smoke generating apptss are to be provided with the pipeline to connect respectively on tube furnace 1, the tube furnace 1
The escape pipe 11 and muffler 12 connect；Tube furnace 1 can adapt to high temperature range more extensively (temperature is at 200-1600 DEG C), can be simultaneously
The simulation of precoated sand low temperature and the heating environment under hot environment is adapted to, and then can detect that precoated sand is produced at different temperatures
The species and concentration of flue gas, you can (temperature when (temperature is 230-250 DEG C) and precoated sand are cast during meeting precoated sand coremaking simultaneously
1000-1400 DEG C of degree) temperature requirement, naturally it is also possible to according to the demand of heating-up temperature, heating furnace is substituted for other heating
Device, such as heating dish, heater box, can equally realize the purpose of the application, its objective without departing from the present invention design philosophy,
Protection scope of the present invention should be belonged to.
Specifically, it is additionally provided with the muffler 12 on charge door 13, the charge door 13 and is provided with closure, is passed through
Set closure to prevent when measuring tube furnace 1 or the leakage of the flue gas in pipeline, cause measurement error, influence measurement
The degree of accuracy；When being tested, closure can be opened to add sand sample into tube furnace 1.
Preferably, the smoke circulating device is oilless vacuum pump 2, and the flue gas in loop is made by oilless vacuum pump 2
Circulation so that flue gas in loop it is more uniform, and then improve the accuracy of measurement；Certainly, the smoke circulating device
It can be such as other devices of ventilating fan, the first pipeline 3, the second pipeline 4, the 3rd pipeline 5 or the 4th are arranged on by ventilating fan
In pipeline 6, the speed for accelerating flue gas recirculation flowing in loop can also be equally realized so that the flue gas mixing in loop is more equal
It is even.
Preferably, the pipeline includes the first pipeline 3, the second pipeline 4, the 3rd pipeline 5 and the 4th pipeline 6, described first
One end of pipeline 3 is connected with the muffler 12, and the other end is connected by the first triple valve 31 with the second pipeline 4, and the described 4th
One end of pipeline 6 is connected with the escape pipe 11, and the other end is connected by triple valve with the 3rd pipeline 5, and the oil-free is true
The suction end 21 of empty pump 2 is connected with the 3rd pipeline 5, and exhaust end 22 is connected with the second pipeline 4；The gas sensor 41 is arranged on
On second pipeline 4.
Wherein, it is provided with dust removal by filtration mechanism 62 in the 4th pipeline 6, the dust removal by filtration mechanism 62 is is arranged on the
Glass fiber mesh in four pipelines 6, is filtered by glass fiber mesh, removes the solid particulate matter produced during precoated sand burning
(carbon particle do not burnt completely such as), and then ensure the accuracy of measurement.
Specifically, condenser 61 is additionally provided with the 4th pipeline 6, and the condenser 61 is located at dust removal by filtration mechanism
62 and second between triple valve 51, and the flue gas produced in tube furnace 1 first passes through filter filtering, afterwards, is passing through condenser
61 coolings, are cooled down by condenser 61 to the high-temperature flue gas (700-800 DEG C) produced in tube furnace 1, suitable being cooled to
Enter in air collector and measure after temperature (room temperature), ensure that the accuracy of measurement；Preferably, by the way of water cooling
Cooled down, naturally it is also possible to using other types of cooling, can equally realize in the application to enter the flue gas in tube furnace 1
The purpose of row cooling；Temperature sensor 63 is wherein additionally provided between the triple valve 51 of condenser 61 and second, the temperature is passed
Sensor 63 is used for the temperature for measuring the flue gas come out from condenser 61, it is ensured that can accurate flue-gas temperature in control piper, with
Prevent the accuracy of the too high influence measurement of temperature of flue gas.
Further, drying tube 43 is provided with second pipeline 4, the drying tube 43 is located at the He of oilless vacuum pump 2
Between air borne sensor, the flue gas discharged by the exhaust end 22 of oilless vacuum pump 2 enters to be dried in drying tube 43, to remove
Because certain vapor, vapor occurs during heating of the heating-up temperature for 230-300 DEG C in precoated sand in flue gas
Being mixed with flue gas may impact to the result of detection, therefore add thermogenetic flue gas to enter to precoated sand by drying tube 43
Row drying, it is ensured that the accuracy of measurement result.
Further, spinner flowmeter 42 is additionally provided with second pipeline 4, the spinner flowmeter 42 is located at drying
Between the triple valve 31 of pipe 43 and first, by spinner flowmeter 42 come the flow of flue gas in measuring loop, and then to measure overlay film
The species and concentration of the flue gas included in the flue gas that sand is produced under casting or coremaking environment.
Present invention also offers the detection method that flue gas is discharged when a kind of precoated sand coremaking or casting, comprise the following steps：
S1, opens tube furnace 1 and switchs, and is warming up to preset temperature and (comes true according to condition when precoated sand coremaking or casting
Fixed, temperature during coremaking is 250-300 DEG C, preferably 260 DEG C；Temperature when precoated sand is cast is 1000-1400 DEG C)；
S2, the first triple valve 31 of regulation and the second triple valve 51, make structure between smoke generating apptss and smoke circulating device
Into closed-loop path, i.e.,：The first pipeline 3 is connected with the second pipeline 4, the 3rd pipeline 5 is connected with the 4th pipeline 6, and then make whole
Flue gas in closed-loop path can be circulated, while it is cold to the high-temperature flue gas progress in tube furnace 1 out to open condenser 61
But；
S3, weighs appropriate sand sample (15g), sand sample is put into smoke generating apptss, and heats 2-10 in constant temperature zone
Minute, preferably in flat-temperature zone heating 5 minutes, now sand sample meets burning situation of the precoated sand in coremaking or casting just
And burning time, make the more abundant of precoated sand burning, the accuracy of measurement result can be improved；
S4, start smoke circulating device, driving smoke generating apptss in produce flue gas flowed in pipeline, when entirely close
The smoke distribution closed in loop is uniform, and now the measurement of gas sensor 41 is more accurate；
Record data after S5, the numerical stability shown on gas sensor 41；
S6, the first triple valve 31 of regulation and/or the second triple valve 51, the fume emission in pipeline is gone out, gas is passed
Sensor 41 is zeroed；Two steps are specifically included, the closure at charge door 13 are first turned on while adjusting the first triple valve 31 makes
Obtain the second pipeline 4 to connect with outside air, while adjusting the second triple valve 51, the 3rd pipeline 5 is connected with the 4th pipeline 6, this
When outside air from charge door 13 go out enter simultaneously by the first triple valve 31 discharge constitute an exhaust lay out, start oil-free it is true
Flue gas (flue gas mainly in tube furnace 1) discharge in closed-loop path is completed preliminary fume emission work by empty pump 2；Secondly,
When the numerical value of the reality of gas sensor 41 is reached below 100, the second triple valve 51 of regulation causes the 3rd pipeline 5 and outside air
Connection, the air now entered from the second triple valve 51 is discharged from the first triple valve 31, now starts oilless vacuum pump 2 by loop
Interior flue gas (flue gas predominantly in the 3rd pipeline and second pipe) discharge, now the flue gas in exhaust process in loop is not
By the pipeline 6 of tube furnace 1 and the 4th, the resistance for discharging flue gas is smaller, and the speed of discharge is faster；Until sensor zero, now
Precoated sand sample collection remaining in tube furnace 1 is come out；Then repeat the above steps next group of experiment of progress.
Using the above method, to detect the species and concentration of the flue gas that precoated sand is produced in coremaking, measure it is more convenient,
Easily, and using gas sensor 41 measure, the accuracy of measurement, it is comprehensive more preferably, while measurement efficiency it is also higher.
In summary, the invention provides the detection device that flue gas is discharged when a kind of film sand coremaking or casting, including flue gas
Generating means and smoke circulating device, smoke generating apptss and smoke circulating device connect and compose closed-loop path by pipeline, together
When gas sensor is set on pipeline, by by precoated sand be put into smoke generating apptss heat, to simulate coremaking and casting
At a temperature of, the situation of precoated sand burning or heating, and the air circulation in pipeline is driven by smoke circulating device, it is ensured that promote
Make the flue gas concentration of each several part in pipeline uniform, while detecting precoated sand in coremaking by the gas sensor set on pipeline
And the composition and the concentration of flue gas of the flue gas of casting generation, and because whole device is constituted in a closed-loop path, pipeline
Flue gas concentration is uniform, and it is more accurate to measure, and measurement efficiency is higher, while the scope that gas sensor can measure flue gas is wider,
It is more comprehensively accurate to flue gas composition measurement compared with the method measured using spectrophotometer；And the present invention is provided
Testing agency it is simple in construction, measurement be more prone to, measurement it is more efficient.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (7)
1. the detection device of flue gas is discharged when a kind of precoated sand coremaking or casting, it is characterised in that：Including smoke generating apptss and
Smoke circulating device, the smoke generating apptss and smoke circulating device are sequentially connected with to form closed-loop path by pipeline, described
Smoke circulating device is used to drive flue gas recirculation in pipeline to flow, and gas sensor (41), the gas are provided with the pipeline
Body sensor (41) is used for the composition and the concentration of flue gas of flue gas in signal piping；The smoke generating apptss are tube furnace (1),
The escape pipe (11) and muffler (12) being connected respectively with the pipeline are provided with the tube furnace (1)；The muffler
(12) charge door (13) is additionally provided with；
The smoke circulating device is oilless vacuum pump (2)；
The pipeline includes the first pipeline (3), the second pipeline (4), the 3rd pipeline (5) and the 4th pipeline (6), first pipeline
(3) one end is connected with the muffler (12), and the other end is connected by the first triple valve (31) with the second pipeline (4), described
One end of 4th pipeline (6) is connected with the escape pipe (11), and the other end passes through the second triple valve (51) and the 3rd pipeline
(5) connect, the suction end (21) of the oilless vacuum pump (2) is connected with the 3rd pipeline (5), exhaust end (22) and the second pipeline
(4) connect；The gas sensor (41) is arranged on the second pipeline (4).
2. the detection device of flue gas is discharged when precoated sand coremaking according to claim 1 or casting, it is characterised in that：It is described
Dust removal by filtration mechanism (62) is provided with 4th pipeline (6).
3. the detection device of flue gas is discharged when precoated sand coremaking according to claim 2 or casting, it is characterised in that：It is described
Dust removal by filtration mechanism (62) is glass fiber mesh.
4. the detection device of flue gas is discharged when precoated sand coremaking according to claim 3 or casting, it is characterised in that：It is described
Condenser (61) is additionally provided with 4th pipeline (6), and the condenser (61) is located at dust removal by filtration mechanism (62) and the two or three
Between port valve (51).
5. the detection device of flue gas is discharged when precoated sand coremaking according to claim 4 or casting, it is characterised in that：It is described
Be provided with drying tube (43) on second pipeline (4), the drying tube (43) be located at oilless vacuum pump (2) and air borne sensor it
Between.
6. the detection device of flue gas is discharged when precoated sand coremaking according to claim 5 or casting, it is characterised in that：It is described
Spinner flowmeter (42) is additionally provided with second pipeline (4), the spinner flowmeter (42) is located at drying tube (43) and the one or three
Between port valve (31).
7. the detection method of flue gas is discharged when a kind of precoated sand coremaking or casting, it is characterised in that appoint using such as claim 1-6
The detection device of flue gas is discharged when precoated sand coremaking described in one or casting, is comprised the following steps：
S1, opens tube furnace (1) switch, is warming up to preset temperature；
S2, the first triple valve of regulation (31) and the second triple valve (51), make structure between smoke generating apptss and smoke circulating device
Into closed-loop path；
S3, sand sample is put into smoke generating apptss and heated 2-10 minutes；
S4, starts the flue gas produced in smoke circulating device, driving smoke generating apptss and is flowed in pipeline；
Record data after S5, the numerical stability shown on gas sensor (41)；
S6, the first triple valve of regulation (31) and/or the second triple valve (51), the fume emission in pipeline is gone out, gas is passed
Sensor (41) is zeroed.
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| CN108303293A (en) * | 2018-02-09 | 2018-07-20 | 华能国际电力股份有限公司 | The sampling of sulfur trioxide and detecting system and method in a kind of fire coal boiler fume |
| CN109612529A (en) * | 2018-12-27 | 2019-04-12 | 广州市圣高测控科技有限公司 | A kind of measuring multiple parameters control pick-up wireless transmission integrated multi-functional instrument |
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| CN102788866A (en) * | 2012-08-27 | 2012-11-21 | 重庆长江造型材料（集团）有限公司 | Device for detecting waste gas generated in resin precoated sand core preparation curing process |
| CN103424521A (en) * | 2013-08-01 | 2013-12-04 | 浙江工商大学 | Device and method for detecting freshness of beef |
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| US4565561A (en) * | 1984-12-05 | 1986-01-21 | Ppg Industries, Inc. | Method of and apparatus for analyzing atmosphere of a furnace |
| CN201532387U (en) * | 2009-10-21 | 2010-07-21 | 湖南省电力公司试验研究院 | Device for testing sulfuric dioxide content in flue gas |
| US20140199771A1 (en) * | 2013-01-17 | 2014-07-17 | Miratech Holdings, Llc | METHOD AND APPARATUS FOR ANALYSIS AND SELECTIVE CATALYTIC REDUCTION OF NOx-CONTAINING GAS STREAMS |
| CN104502159A (en) * | 2014-12-10 | 2015-04-08 | 郑州光力科技股份有限公司 | Gas sampling and detecting device |
| CN204882508U (en) * | 2015-07-30 | 2015-12-16 | 北京仁创科技集团有限公司 | Check out test set of release flue gas when coremaking of tectorial membrane sand or casting |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788866A (en) * | 2012-08-27 | 2012-11-21 | 重庆长江造型材料（集团）有限公司 | Device for detecting waste gas generated in resin precoated sand core preparation curing process |
| CN103424521A (en) * | 2013-08-01 | 2013-12-04 | 浙江工商大学 | Device and method for detecting freshness of beef |
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