CN212059567U - Livestock and poultry breeding field gas multi-point on-line automatic acquisition system - Google Patents

Abstract

The utility model relates to an online automatic acquisition system of gaseous multiple spot position in beasts and birds field district, including multiunit gas production head, multiunit air inlet pipeline, gaseous collection box, gaseous back flush system, the gaseous sample of each monitoring point position of plant gets into the air inlet pipeline through placing the gas production head on telescopic bracket top, then in carrying gaseous collection box through the air inlet pipeline, the gaseous sample of collection gets into gaseous monitoring instrument in order after switching through the diverter valve that admits air in gaseous collection box. The utility model provides a gaseous multiple spot position on-line automatic acquisition method in beasts and birds breed place can realize the automatic online continuous collection of the gaseous sample of a plurality of monitoring points positions in beasts and birds field automatically for gaseous on-line monitoring instrument surveys in real time in succession. Compared with the conventional method, the utility model discloses simplify the gaseous collection flow in beasts and birds field, saved the manual work, submitted gaseous detection precision.

Description

Livestock and poultry breeding field gas multi-point on-line automatic acquisition system

Technical Field

The utility model belongs to the technical field of the livestock and poultry farming environmental monitoring, a gaseous on-line monitoring's of livestock and poultry farm multiple spot position automatic acquisition system is related to.

Background

With the rapid development of intensive livestock and poultry breeding industry, the problem of atmospheric environmental pollution caused by livestock and poultry breeding is more and more emphasized. The general area in beasts and birds field is great, including the colony house, pile excrement canopy, multiple facilities such as sewage treatment district, the colony house can divide the exhaust area again, the window district, the air inlet district, different regions such as passageway district, the gaseous pollutant kind that the field produced simultaneously is more, including ammonia, hydrogen sulfide, nitrous oxide, VOCs, PM2.5, PM10 etc. in order to make clear out the characteristic of beasts and birds plant pollutant, the evaluation beasts and birds industry is to atmospheric pollution degree, often need arrange the gas monitoring point position at different position and carry out long-term on-line monitoring.

In the conventional gas sample monitoring of the culture farm, the collection of the gas sample needs to be manually collected in different monitoring point positions by using a handheld gas collector respectively, and then the gas sample is taken back to a laboratory for measurement. The method can not realize real-time determination of the puzzle of the gas sample, and needs to frequently go to and fro the laboratory and the livestock and poultry farm, which wastes time and labor. Meanwhile, ammonia gas, hydrogen sulfide, odor and PM2.5 in the gas sample at the monitoring point of the culture area are harmful to human bodies and harm the bodies of sampling workers.

In recent years, with the breakthrough of modern technology, on-line gas monitoring instruments are beginning to be applied to gas monitoring, and these instruments can realize on-line continuous measurement of gas pollutant indexes under unattended conditions, so that they are favored by researchers. On one hand, however, because the existing online water quality monitoring instrument is designed mainly for measuring the gas pollutants in the tail gas of urban atmosphere or industrial equipment, the instrument is generally installed on a fixed monitoring site, and a gas sampling device correspondingly matched with the instrument can only collect gas samples at a single point; on the other hand, a complete set of gas monitoring instrument comprises an ammonia gas sensor, a hydrogen sulfide sensor, a methane sensor, a carbon dioxide sensor, a nitrous oxide sensor, a TVOCs sensor and the like, and the instrument is expensive. Due to the reasons, the existing gas monitoring instrument is limited in gas pollutant monitoring application in the culture area. Therefore, how to realize the on-line continuous collection of the gas samples at different sites in the livestock and poultry breeding field is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the weak point of the gaseous sample collection technique in current beasts and birds plant, provide a simple operation, simple structure, the gaseous on-line monitoring's in beasts and birds plant automatic acquisition method that can realize under the unmanned on duty condition multiple spot position, solve the unable gaseous monitoring problem of being applied to in beasts and birds plant in a large number of current online gas monitoring instrument.

The utility model provides a technical scheme that technical problem adopted is:

a multi-point on-line automatic gas acquisition system in a livestock farm area comprises a telescopic support frame, a plurality of groups of gas acquisition heads, a plurality of groups of gas inlet pipelines, a gas acquisition box and a gas back-flushing system, wherein the plurality of groups of gas acquisition heads are arranged at the top of the telescopic support frame and are connected with the front of the gas acquisition box through the gas inlet pipelines, the gas back-flushing system is connected with the gas acquisition box through the back-flushing pipeline, a gas sample at each monitoring point of a farm enters the gas inlet pipeline through the gas acquisition heads arranged at the top end of the telescopic support frame and is then conveyed into the gas acquisition box through the gas inlet pipeline, the acquired gas samples sequentially enter a gas monitoring instrument in the gas acquisition box after being switched through a gas inlet switching valve, after the gas at one monitoring point is acquired, the gas back-flushing system starts to pump fresh air at the wind, and cleaning the filter, the gas pipeline and the gas production head.

Moreover, the gas collection box comprises an air inlet switching valve box, a controller, a power switch, an exhaust switching valve and a steam-water separator; the air inlet switching valve box is internally provided with an air inlet pipeline and an air inlet switching valve disc, a plurality of groups of air inlet pipelines enter the air collecting box from the upper part, the air inlet pipeline is communicated and connected with the air inlet switching valve disc, the electromagnetic control ends of the air inlet switching valve disc are all connected with the controller, the controller controls the on-off or back flushing of the eight pipelines, the controller is connected with the power switch, the number of the air outlet pipes of the air inlet switching valve disc is one, the air outlet pipes extend out of the air inlet switching valve box and then are sequentially connected with the exhaust switching valve, then are connected with the steam-water separator, and then are.

And before each air inlet pipeline is connected with the air inlet switching valve disc, the air inlet pipeline is sequentially provided with a filter, a back washing switching valve, an air suction pump and the connected air inlet pipelines, and the other direction of the back washing switching valve is connected with a gas back washing system through the back washing pipeline.

Moreover, the gas backwashing system comprises a gas production head with an air inlet of an air compressor connected with a clean air position.

And the sampling head comprises a coarse filter screen cover, a honeycomb cover, a fine filter and an air inlet pipeline joint, wherein the air inlet pipeline is provided with a conical air inlet, the end part of the conical air inlet is coaxially covered with the coarse filter screen cover, the honeycomb cover is arranged inside the coarse filter screen cover, the fine filter is arranged inside the honeycomb cover, and the drying agent layer is arranged inside the fine filter.

The coarse filter screen cover is an air inlet side, the surface of the coarse filter screen cover is a stainless steel square grid, the side length of the grid is less than or equal to 0.5cm, the grid is detachable, the surface of the honeycomb cover is a honeycomb hole, the pore diameter is less than or equal to 50mm, the fine filter comprises two layers of filter screens, the thickness of the outer layer of filter screen is 5-10cm, and large-particle dust with the particle diameter of more than or equal to 50 microns in filtered gas is filtered; the thickness of the inner layer filter screen is 0.5-2cm, and the filtering particle size is more than or equal to 5 μm.

And the gas desiccant is calcium chloride or activated alumina.

The application has the advantages that:

the multi-point automatic acquisition method for the on-line monitoring of the gas in the livestock and poultry farm can realize the automatic on-line continuous acquisition and conveying of the gas samples at different monitoring points in the breeding farm under the unattended condition to a gas monitoring instrument, and realizes the real-time continuous measurement of the gas samples at a plurality of monitoring points in the breeding farm by one set of monitoring instrument. Compared with the conventional method, the method has the following advantages: (1) the method simplifies the gas sample collection process of the culture farm, and saves manpower; (2) the tiny dust adhered to the sampling head and the gas pipeline is effectively reduced, the service life of the gas collecting device is prolonged, and the influence of the dust in the gas sample in the culture area on the precision of a monitoring instrument is reduced; (3) the mutual interference among gas samples in different gas pipelines is eliminated, and the detection precision is improved.

The multi-point automatic acquisition method for the on-line monitoring of the gas in the livestock and poultry farm has reasonable overall design and convenient operation, can be used together with the existing on-line gas monitoring instrument, and realizes the real-time continuous measurement of a plurality of monitoring point gas samples in the breeding farm by one set of gas monitoring instrument.

Drawings

Fig. 1 is a schematic plan view of the present application.

FIG. 2 is a schematic view of a planar structure of a gas collection box according to the present application.

FIG. 3 is a schematic plan view of the intake switching valve disk.

Fig. 4 is a schematic structural view of the intake switching valve housing.

Fig. 5 is a schematic view of a retractable stand.

Fig. 6 is a schematic view of a gas production head.

Fig. 7 is a schematic view of the internal structure of fig. 6.

The designations in the drawings have the following meanings:

1 to 8 are air inlet pipelines, 9 is an air inlet switching valve disc (9-1 to 9-9 are air-cut pipeline one-way valve valves, can be two six-way valves, or one six-way valve and one four-way valve, share 8-way passages), 10 is a switch controller (a gas one-way valve for controlling 9-1 to 9-9), 11 is a metal wire, 12 is a power switch, 13 is a gas collecting pipeline, 14 is an exhaust switching valve, 15 is an exhaust pipe, 16 is a data transmission line, 17 is a gas detection instrument, 18 is a steam-water separator, 1-1 is a filter, 1-2 is a back flush switching valve, 1-3 is an air suction pump, 19 is a gas connecting pipe, 20 is an air outlet valve, 21 is a back flush pipeline, 22 is an air compressor, 23 is a gas collecting box, 24 is a telescopic bracket, and 25 is a gas collecting head (wherein 25-1 to 25-8 are respectively gas collecting heads installed at monitoring points 1 to 8, 25-9 is a gas collecting head installed at the position of clean air, 26 is a coarse filter screen cover, 27 is a honeycomb cover, 28 is a fine filter, 29 is a gas drying agent layer, 30 is an air inlet pipeline connector, 31 is a data collector, and A is an air inlet switching valve box.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, which are illustrative, not restrictive, and the scope of the invention should not be limited thereto.

A multipoint on-line automatic gas acquisition system in a livestock and poultry farm comprises a telescopic support frame, a plurality of groups of gas acquisition heads, a plurality of groups of gas inlet pipelines, a gas acquisition box and a gas backwashing system. The gas sampling heads are arranged at the top of the telescopic bracket and are connected with the front surface of the gas collecting box through a gas inlet pipeline, and the gas backwashing system is connected with the gas sampling box through a backwashing pipeline. Gaseous sample of each monitoring point position of plant gets into the air inlet pipeline through placing the gas production head on scalable support frame top, then carries gaseous collection case through the air inlet pipeline in, and the gaseous sample of collection gets into gas monitoring instrument (gaseous detector, detectable methane, carbon dioxide, nitrous oxide, volatile organic compounds, ammonia, hydrogen sulfide's concentration) in order after switching through the diverter valve that admits air in gaseous sampling case. After the gas at one monitoring point is collected, the gas backwashing system starts to pump the fresh air at the upwind position outside the farm into the backwashing gas filter, the gas pipeline and the gas production head so as to clean residual gas samples and adhered tiny dust particles in the parts such as the gas pipeline, the gas production head and the like.

The gas collection box comprises a gas inlet switching valve box, a controller 10, a power switch 12, an exhaust switching valve 14, a steam-water separator 18, a gas pipeline and a metal wire. Air inlet pipelines 1-8 and an air inlet switching valve disc 9 are arranged in the air inlet switching valve box, a plurality of groups of air inlet pipelines enter the air collecting box from the upper part, the air inlet pipelines are communicated and connected with the air inlet switching valve disc, the electromagnetic control ends of the air inlet switching valve disc are connected with a controller, the controller controls the opening, closing or back flushing of the eight pipelines, and the controller is connected with a power switch. The air outlet pipe of the air inlet switching valve disc is one, extends out of the air inlet switching valve box and is sequentially connected with the exhaust switching valve, then is connected with the steam-water separator, then is connected with the gas detection instrument, and after passing through the gas monitoring instrument, gas is exhausted.

Before each air inlet pipeline is connected with an air inlet switching valve disc, a filter 1-1, a backwashing switching valve (three-way reversing valve) 1-2, an air suction pump 1-3 and the connected air inlet pipeline are sequentially installed on the air inlet pipeline, the backwashing switching valve is controlled by a controller, the other direction of the backwashing switching valve is connected with an air outlet of an air compressor through the backwashing pipeline, an air inlet of the air compressor is connected with a gas collecting head at a clean air position, a backwashing side valve is opened, the air compressor is opened, and the pipeline is washed.

The gas monitoring instrument and the controller can be connected with an upper computer for recording data and programming the controller.

The gas collection box is composed of a plurality of groups of gas inlet pipelines, gas inlet switching valves and gas inlet pipelines connected with the gas inlet switching valves. The front end of each air inlet pipeline is independently connected with the front side of the gas sampling box, the tail end of each air inlet pipeline is connected with the air inlet switching valve box through the air inlet pipeline, and the air inlet switching valve box sequentially comprises a filter, a backwashing switching valve and an air suction pump. Wherein the back-flushing switching valve in each air inlet pipeline is independently connected with a back-flushing gas pipeline.

The gas back-flushing system comprises a back-flushing switching valve, a back-flushing pipeline, an air compressor and a gas production head. The back-washing switching valve is arranged in the air inlet pipeline and is connected with the air compressor and the gas production head through the back-washing pipeline. The gas back-flushing system is mainly used for flushing tiny dust adhered to the gas inlet pipeline, the filter and the sampling head and gas at a residual monitoring point in the gas inlet pipeline.

The air inlet switching valve is disc-shaped and consists of a plurality of air switching valves and air connecting pipes, the upper part of the air inlet switching valve is connected with an air inlet pipeline, and the lower part of the air inlet switching valve is connected with an air collecting pipeline. Wherein each gas switching valve is communicated with the gas outlet valve through a gas connecting pipe in a one-way mode, and the gas switching valves are not connected with each other. When gas samples are detected, the gas samples enter each gas switching valve to be sequentially started and closed according to the detection arrangement sequence of the gas samples at the monitoring point, and the gas samples at the point are ensured to enter a gas monitoring instrument through a gas collecting pipeline.

The application provides a gaseous on-line monitoring's of beasts and birds field multiple spot position automatic acquisition system's concrete structure does: comprises a telescopic support frame 24, a plurality of gas collection heads 25-1 to 25-8, a plurality of groups of gas inlet pipelines 1 to 8, a gas collection box 23, a gas backwashing pipeline 21, a gas compressor 22 and a clean air collection head 25-9. The gas collection heads 25-1 to 25-8 are placed at the top ends of the telescopic supports 24 and are respectively installed at monitoring points P1-P8 of a farm, gas at the monitoring points of the farm is collected into the gas collection box 23 through corresponding gas inlet pipelines 1-8, and all groups of gas samples are automatically and sequentially switched and conveyed to a gas monitoring instrument for detection through the gas inlet switching valve box 18 in the gas collection box.

The gas collection box 23 is square, and the internal structure is as follows: the upper part is connected with the air inlet pipelines 1 to 8, the lower part is sequentially connected with the exhaust switching valve 14 and the steam-water separator 18 through the gas collecting pipeline 13, the left side is sequentially connected with the controller 10 and the power switch 12 through the metal lead 11, and the right side is connected with the back flush gas pipeline 21. The exhaust switching valve 14 is provided with two ports, one is connected with an exhaust pipeline 15, and the other is connected with a steam-water separator 18.

The exhaust switching valve 14 can exhaust gas samples at other points left in the air collection pipeline 13, and when the gas sample at the monitoring point enters the exhaust switching valve 14 after being switched by the gas collection box, the exhaust switching valve 14 is firstly communicated with the exhaust pipe 15 to exhaust the gas sample at the other monitoring points left in the pipeline; after the exhaust is exhausted, the exhaust switching valve 14 is automatically switched into the gas switching valve box 18, is connected to the steam-water separator 17 after passing through the gas collecting pipeline 13, and enters a monitoring instrument to start monitoring after dehydrating, so that the accuracy of a gas sample detection result is ensured again.

The intake switching valve disk is composed of a plurality of groups of intake units (generally 8 groups), an intake switching valve box 9 and an intake pipeline connected with the intake switching valve box. The front end of the air inlet unit is independently connected with the corresponding air inlet pipeline 1-8 at the front side of the air sampling box 23, and the tail end of the air inlet unit is connected with the air inlet switching valve box 18 through the air inlet pipeline. The first group of air inlet units sequentially consists of a filter 1-1, a backwashing switching valve (three-way reversing valve) 1-2, an air suction pump 1-3 and connected air inlet pipelines, wherein the other air outlet end of the backwashing switching valve 1-2 is connected with a backwashing gas pipeline 21. The other eight groups are connected with the first group in the same way.

The air inlet switching valve box is disc-shaped and consists of a plurality of air switching valves (9-1 to 9-8) and an air connecting pipe 19, the upper part of the air inlet switching valve box is connected with an air inlet pipeline (wherein the air switching valve 9-1 is connected with the air inlet pipeline 1, the air switching valve 9-2 is connected with the air inlet pipeline 2, the air switching valve 9-3 is connected with the air inlet pipeline 3, the air switching valve 9-4 is connected with the air inlet pipeline 4, the air switching valve 9-5 is connected with the air inlet pipeline 5, the air switching valve 9-6 is connected with the air inlet pipeline 6, the air switching valve 9-7 is connected with the air inlet pipeline 7, and the. Wherein each gas switching valve (9-1 to 9-8) is communicated with the gas outlet valve 22 in a one-way through a gas connecting pipe 19, and the gas switching valves are not connected with each other. When gas samples are detected, the gas samples enter each gas switching valve to be sequentially started and closed according to the detection arrangement sequence of the gas samples at the monitoring point, and the gas samples at the point are ensured to enter a gas monitoring instrument through a gas collecting pipeline 13. A plurality of groups of air inlet pipelines can be arranged in the gas sampling system, generally 8 groups of air inlet pipelines are arranged, and the specific number is determined according to the number of monitoring point positions.

The gas collection system is connected with the controller through a metal wire, the exhaust switching valve is connected with the controller through a metal wire, and the controller is connected with the power switch through a metal wire. The gas collection box is connected with a computer through a data transmission line.

The sampling head in the application comprises a coarse filter screen 26, a honeycomb cover 27, a fine filter 28 and an air inlet pipeline joint 30. The air inlet pipeline is provided with a conical air inlet, the end part of the conical air inlet is coaxially covered with a coarse filter screen cover, a honeycomb cover is arranged inside the coarse filter screen cover, a fine filter is arranged inside the honeycomb cover, and a drying agent layer 29 is arranged inside the fine filter. The coarse filter screen cover is an air inlet side, the surface of the coarse filter screen cover is a stainless steel square grid, the side length of the grid is less than or equal to 0.5cm, the grid can be detached, washed and replaced, and the coarse filter screen cover is mainly used for filtering floating objects such as feed powder, animal hair and the like in a monitoring point; the surface of the honeycomb cover is provided with honeycomb holes, and the aperture is less than or equal to 50 mm. The fine filter comprises two layers of filter screens, the thickness of the outer layer of filter screen is generally 5-10cm, and large-particle dust with the particle size of more than or equal to 50 μm in the filtered gas is filtered; the thickness of the inner layer filter screen is generally 0.5-2cm, and the filter grain diameter is more than or equal to 5 μm, and the inner layer filter screen is used for filtering small-particle dust. The filter screen material is designed to be synthetic fiber with stable chemical property, and the recommended material of the filter screen for measuring different gas indexes is shown in table 1. The chemical components of the gas drying agent behind the fine filter and the drying agent are different according to different measured gas indexes, and are specifically shown in table 1.

TABLE 1 Fine Filter Screen Material and desiccant recommended composition in gas production head

The filter membrane in the filter in the gas collection system is a filter screen with stable chemical property, the aperture of the filter membrane is less than or equal to 1 mu m, and the thickness of the filter membrane is less than or equal to 1 cm.

The arrangement of gaseous monitoring point position in beasts and birds breed place, the great sensitive region of gaseous chemical index variation in mainly considering breed place, including the entry of breeding the house, the window outside, the exhaust fan outside, the inboard of exhaust fan etc. back flush gas is generally gathered in the area that the wind direction did not have the breed excrement and dirt to stack on the plant area.

The specific operation mode is as follows:

the gas collection method is arranged at the front end of a gas online monitoring instrument. Corresponding quantity (8 in the application) of air inlet pipelines are arranged in a gas collection system according to the requirements of monitoring point locations of livestock and poultry farms, and the tail ends of the air inlet pipelines are placed to the corresponding monitoring point locations (see attached figure 1). And then, turning on a power switch, setting program parameters of a controller, and adjusting program parameters such as sequence, duration, exhaust time, back flush time and the like of the gas sample of the gas inlet pipeline at each monitoring point position entering the gas monitoring instrument. After the controller program parameters are set, starting the controller program, starting an air suction pump in the gas collection system to convey gas at each monitoring point position to a gas switching valve box through a gas inlet pipeline, and sequentially starting gas switching valves in the gas switching valve box to enable a gas sample at the monitoring point position to enter a gas monitoring instrument.

For a clearer description of the specific operating modes, the following are exemplified: when the gas samples of the gas inlet pipeline at each monitoring point enter the gas monitoring instrument in the sequence of 1, 2, 3, 4, 5, 6, 7 and 8 in the figure 1, the duration of each gas sample in the gas monitoring instrument is 2min, the back flushing valve lasts 5min, and the residual gas in the exhaust pipeline is discharged for 30 s. After the controller 10 is started, the air compressor in the flushing system is started, and at this time, the air suction pump, the back flush switching valve, the air switching valve in the air switching valve box and the exhaust switching valve in each air inlet unit are all in a closed state. When the pressure of the air compressor is balanced, a back flush switching valve 1-2 in the air inlet pipeline 1 is started and communicated with a back flush pipeline 21, a filter 1-1, the air inlet pipeline 1 and a gas production head, clean air at the position 25-9 of the gas production head is conveyed into the air inlet pipeline, and the air pipeline, a filter screen and the gas production head are flushed. After 5min, the back flush switching valve 1-2 automatically switches and communicates the filter screen 1-1 and the air suction pump 1-3, the air suction pump 1-3 in the air inlet pipeline is started, the gas sample in the monitoring point position 1 is conveyed to the gas switching valve box, the switching valve 18-1 and the gas outlet valve 20 in the gas switching valve box are simultaneously started, the gas switching valves 18-2 to 18-8 are all in a closed state, and the gas sample in the gas inlet pipeline 1 enters the gas collecting pipe 13 from the gas switching valve 18-1 along the gas connecting pipe 19. At this time, the exhaust switching valve 14 is communicated with the exhaust pipe 15 to discharge the residual gas in the pipeline; and after the gas is exhausted for 30s, the gas exhaust switching valve 14 automatically switches to close the gas exhaust pipeline 15, the gas-water separator 17 is communicated, and the sample in the monitoring point 1 enters a monitoring instrument after being dehydrated. After the time lasts for 2min, the gas switching valve 18-1 and the gas outlet valve 20 are automatically closed at the same time, and the exhaust switching valve 14 closes a passage connected with a gas monitoring instrument and is communicated with the exhaust switching valve 14. The operation flow of the gas sample entering the gas monitoring instrument from the corresponding monitoring point position of other gas inlet pipelines is the same as the above.

Claims (6)

1. The utility model provides a gaseous multiple spot position of beasts and birds field district is automatic acquisition system on line which characterized in that: comprises a telescopic support frame, a plurality of groups of gas production heads, a plurality of groups of gas inlet pipelines, a gas collection box and a gas back flushing system, wherein the plurality of groups of gas production heads are arranged at the top of the telescopic support frame, the gas sampling system is connected with the gas sampling box through a gas inlet pipeline, the gas back-flushing system is connected with the gas sampling box through a back-flushing pipeline, gas samples at each monitoring point of the farm enter the gas inlet pipeline through a gas production head arranged at the top end of the telescopic support frame, then the gas is conveyed into a gas collection box through a gas inlet pipeline, collected gas samples enter a gas monitoring instrument in sequence after being switched by a gas inlet switching valve in the gas collection box, after the gas at one monitoring point is collected, and starting the gas backwashing system to pump fresh air at the windward part outside the farm into the backwashing gas filter, the gas pipeline and the gas production head, and cleaning the filter, the gas pipeline and the gas production head.

2. The multipoint on-line automatic gas acquisition system for the livestock and poultry farm according to claim 1, which is characterized in that: the gas collection box comprises a gas inlet switching valve box, a controller, a power switch, an exhaust switching valve and a steam-water separator; the air inlet switching valve box is internally provided with an air inlet pipeline and an air inlet switching valve disc, a plurality of groups of air inlet pipelines enter the air collecting box from the upper part, the air inlet pipeline is communicated and connected with the air inlet switching valve disc, the electromagnetic control ends of the air inlet switching valve disc are all connected with the controller, the controller controls the on-off or back flushing of the eight pipelines, the controller is connected with the power switch, the number of the air outlet pipes of the air inlet switching valve disc is one, the air outlet pipes extend out of the air inlet switching valve box and then are sequentially connected with the exhaust switching valve, then are connected with the steam-water separator, and then are.

3. The multipoint on-line automatic gas acquisition system for the livestock and poultry farm according to claim 1, which is characterized in that: and before each air inlet pipeline is connected with an air inlet switching valve disc, a filter, a backwashing switching valve, an air suction pump and the connected air inlet pipelines are sequentially arranged on the air inlet pipeline, and the other direction of the backwashing switching valve is connected with a gas backwashing system through a backwashing pipeline.

4. The multipoint on-line automatic gas acquisition system for the livestock and poultry farm according to claim 3, which is characterized in that: the gas backwashing system comprises an air inlet of an air compressor connected with a gas production head for cleaning air.

5. The multipoint on-line automatic gas acquisition system for the livestock and poultry farm according to claim 1, which is characterized in that: the gas production head comprises a coarse filter screen cover, a honeycomb cover, a fine filter and a gas inlet pipeline joint, wherein the gas inlet pipeline is provided with a conical gas inlet, the end part of the conical gas inlet is coaxially covered with the coarse filter screen cover, the honeycomb cover is arranged inside the coarse filter screen cover, the fine filter is arranged inside the honeycomb cover, and a drying agent layer is arranged inside the fine filter.

6. The multipoint on-line automatic gas acquisition system for the livestock and poultry farm according to claim 5, which is characterized in that: the coarse filter screen cover is an air inlet side, the surface of the coarse filter screen cover is a stainless steel square grid, the side length of the grid is less than or equal to 0.5cm, the grid is detachable, the surface of the honeycomb cover is a honeycomb hole, the pore diameter is less than or equal to 50mm, the fine filter comprises two layers of filter screens, the thickness of the outer layer of filter screen is 5-10cm, and large-particle dust with the particle diameter of more than or equal to 50 microns in filtered air is filtered; the thickness of the inner layer filter screen is 0.5-2cm, and the filtering particle size is more than or equal to 5 μm.

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