A wind pipe distribution automatic switching device for a breeding house

Abstract

The utility model discloses a kind of air distribution pipe season-changing automatic switching device applied to breeding house, belong to the technical field of livestock breeding engineering and environmental control equipment, including motor push-pull rod, fan, cableway system, air distribution pipe and wind pipe inner diaphragm, the cableway system includes cableway, pulley and sling, air distribution pipe is equipped with wind pipe inner diaphragm, pipe wall is equipped with upper air outlet and lower air outlet, the motor push-pull rod operation is controlled by ring controller, one end of cableway is fixedly connected with motor push-pull rod, the other end passes through pulley and enters air distribution pipe inside and is connected with wind pipe inner diaphragm.The utility model drives cableway by motor push-pull rod, cooperate with counterweight structure on wind pipe inner diaphragm, realize the up-down switching of wind pipe inner diaphragm in air distribution pipe inside, to automatically control the opening and closing of upper air outlet or lower air outlet, can be automatically completed winter summer ventilation mode switching according to ambient temperature, solve the problem of manual operation lag and high labor intensity.

Description

Technical Field

[0001] This utility model relates to the technical field of livestock breeding engineering and environmental control equipment, and in particular to an automatic seasonal switching device for ventilation ducts in livestock sheds. Background Technology

[0002] In large-scale livestock and poultry farming, especially in pig farming, precise control of the pigsty environment directly affects the growth and health of pigs, their production performance, and the economic benefits of farming. Among these factors, the ventilation system, as a core component of environmental control, is crucial in terms of its operational efficiency and adaptability. With the increasing intensification of farming, precision air distribution ducts have become increasingly popular in large-scale farming enterprises due to their advantages such as uniform airflow, convenient installation, and controllable costs, making them one of the mainstream pigsty ventilation devices.

[0003] To adapt to the different climate characteristics and physiological needs of pigs in different seasons, current pigsty ventilation systems in the breeding industry are mostly divided into winter and summer operation modes. By adjusting the ventilation mode, it is possible to effectively reduce "cold stress" and "heat stress" in pigs caused by environmental discomfort, as well as energy waste in the farm, thereby ensuring breeding efficiency. However, the current mainstream pigsty ventilation ducts mostly rely on manual adjustment of the ducts to switch between winter and summer ventilation modes, which exposes significant technical shortcomings during the seasonal transition. This method suffers from a serious lack of timeliness in switching; moreover, manual switching requires employees to enter the pigsty, which is not only labor-intensive and costly, but may also increase the risk of biosecurity in the pigsty due to personnel movement.

[0004] The existing method of manually switching ventilation ducts in pigsties during seasonal changes is no longer suitable for the dynamically changing climate conditions during seasonal transitions, nor can it meet the demands of large-scale pig farming for "precise, automated, and low-intervention" environmental control. Therefore, developing a ventilation duct seasonal switching technology that can be automatically triggered based on ambient temperature and requires no manual operation to solve pain points such as "untimely switching," "high labor intensity," and "high risk of stress to pigs" has become an urgent technological breakthrough in the field of livestock farming environmental engineering.

[0005] Therefore, this utility model proposes an automatic seasonal switching device for ventilation ducts in livestock sheds to address the shortcomings of existing technologies. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides an automatic seasonal switching device for ventilation ducts in livestock sheds. It aims to improve the existing technology, which has problems such as reliance on manual operation, high labor intensity, delayed response leading to stress in livestock, and low ease of use when switching ventilation modes for seasonal changes in ventilation ducts in livestock sheds.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an automatic seasonal switching device for a ventilation duct in a breeding shed, comprising: a fan, and a ventilation duct connected thereto, wherein a connection is provided between the fan and the air inlet end of the ventilation duct, and an upper air outlet and a lower air outlet are provided on the wall of the ventilation duct along its length direction, and a plurality of hanging ears are provided on the top of the outer wall of the ventilation duct.

[0008] It also includes a motor push-pull rod, a sliding cable assembly, and an inner duct diaphragm located inside the air distribution duct;

[0009] The zipline assembly includes a zipline, a pulley, and a hanging device. The motor push-pull rod is fixed to the wall or column of the breeding shed by a bracket. The telescopic end of the motor push-pull rod is fixedly connected to one end of the zipline. The hanging device is fixedly connected above the air inlet end of the air distribution duct. The pulley is suspended on the hanging device. The other end of the zipline passes through the groove of the pulley and through the wall of the air distribution duct to enter the interior of the air distribution duct. The zipline is located inside the air distribution duct at the end near the fan and is fixedly connected to the diaphragm inside the air distribution duct.

[0010] Preferably, the diaphragm inside the duct extends along the length of the air distribution duct and is located at the middle of the horizontal height of the air distribution duct, dividing the air distribution duct into two independent upper and lower spaces. The edge of the diaphragm inside the duct is provided with a counterweight bolt, and the diaphragm inside the duct moves up and down inside the air distribution duct by the traction of the sliding cable or the gravity of the counterweight bolt, so as to selectively fit the upper or lower pipe wall of the air distribution duct.

[0011] Preferably, the air inlet end of the diaphragm in the duct is provided with a perforated edge, and a carbon fiber strip is inserted through the perforated edge. The duct wall of the air distribution duct has sliding outlets at the two ends of the carbon fiber strip. The two ends of the carbon fiber strip extend through the corresponding sliding outlets to the outside of the air distribution duct. Both ends of the carbon fiber strip outside the air distribution duct are connected with anti-slip buckles, and the outer diameter of the anti-slip buckles is larger than the diameter of the sliding outlet.

[0012] Preferably, the surface of the diaphragm inside the duct is provided with a winding cable that extends to the edge of the perforation, and the cable is wound around and fixed to the edge of the perforation.

[0013] Preferably, the lifting device is made of stainless steel wire rope, the pulley is made of stainless steel, and the cable extends horizontally after being led out by the motor push-pull rod, and enters the air distribution duct vertically after being redirected by the pulley.

[0014] Preferably, the hanging ears are spaced apart along the length of the air distribution duct, and the distance between two adjacent hanging ears is less than or equal to 2 meters. The upper air outlet and the lower air outlet are both made of polyethylene material, and acrylic gaskets are provided at the connection between the upper air outlet and the lower air outlet and the air distribution duct.

[0015] Preferably, the automatic seasonal switching device for the ventilation ducts used in the breeding shed further includes an environmental controller, which is electrically connected to the motor push-pull rod. The environmental controller is configured to: control the motor push-pull rod to retract when the monitored temperature is greater than or equal to 16 degrees Celsius, and control the motor push-pull rod to extend when the monitored temperature is less than or equal to 14 degrees Celsius.

[0016] Preferably, the extension stroke of the motor push-pull rod is greater than or equal to the diameter of the air distribution duct, and the pushing force and pulling force of the motor push-pull rod are both greater than or equal to 500 Newtons.

[0017] Preferably, the air duct and the diaphragm inside the air duct are made of flexible fabric, and the bulk density of the air duct is greater than or equal to 115 grams per square meter. The zipline is made of stainless steel wire rope with a tensile strength greater than or equal to 1270 MPa.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, by setting up a collaborative structure of motor push-pull rod, sliding cable assembly, air distribution duct and diaphragm inside the air distribution duct, the automatic seasonal switching of the air distribution duct is realized. The device is compatible with the existing pig house fan and air distribution duct main structure, without the need for large-scale modification of the original equipment, reducing modification costs and application threshold, and ultimately realizing precise, automated and low-manual intervention in the environmental control of the breeding house.

[0020] 2. This utility model avoids cold and heat stress problems in pigs caused by the lag in manual switching by automatically switching the ventilation ducts in a timely manner during seasonal changes, thus ensuring the healthy growth and safety of pigs. At the same time, it greatly reduces the labor intensity of employees, reduces the manpower allocation and cost investment in large-scale farming scenarios, avoids the biosecurity risks caused by personnel movement, and strengthens the disease prevention capabilities of the breeding house. Attached Figure Description

[0021] Figure 1 This is a perspective view of an automatic seasonal switching device for ventilation ducts in a livestock shed, as proposed in this utility model.

[0022] Figure 2 This is a left view of an automatic seasonal switching device for ventilation ducts in livestock sheds proposed in this utility model;

[0023] Figure 3 This utility model provides a longitudinal sectional view of a ventilation duct for an automatic seasonal switching device for ventilation ducts used in livestock sheds.

[0024] Figure 4 This is an unfolded diagram of the diaphragm inside the air duct of an automatic seasonal switching device for air ducts used in livestock sheds, as proposed in this utility model.

[0025] Legend:

[0026] 1. Motor push-pull rod; 2. Fan; 301. Slide cable; 302. Pulley; 303. Hanger; 4. Air distribution duct; 401. Hanging lug; 402. Upper air outlet; 403. Lower air outlet; 5. Inner diaphragm of air duct; 501. Carbon fiber strip; 502. Counterweight bolt; 503. Slide outlet; 504. Anti-slip buckle; 505. Wrapped slide cable; 506. Perforated edge; 6. Connection point. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Reference Figures 1-4 This utility model provides an automatic seasonal switching device for ventilation ducts in livestock sheds, which aims to solve the structural defects in the prior art that rely on manual operation for switching ventilation modes in livestock sheds, resulting in high labor intensity, slow response, and easy occurrence of cold and heat stress in livestock.

[0029] The automatic seasonal switching device for the air distribution duct used in the breeding shed includes a fan 2 and an air distribution duct 4 connected to the air outlet of the fan 2. The fan 2 serves as a power source to continuously supply fresh air (fresh air) into the air distribution duct 4. The air distribution duct 4 serves as the main air supply carrier, extending to various areas of the breeding shed. A connection 6 is provided between the air inlet of the fan 2 and the air inlet of the air distribution duct 4, which achieves a sealed and fixed connection between the fan 2 and the air distribution duct 4. Multiple upper air outlets 402 and multiple lower air outlets 403 are spaced apart along the length of the air distribution duct 4 on the duct wall. The upper air outlets 402 are located in the upper half of the cross-section of the air distribution duct 4 and are used for winter air supply. The lower air outlets 403 are located in the lower half of the cross-section of the air distribution duct 4 and are used for summer air supply. Several hanging ears 401 are provided along the length of the top of the outer wall of the air distribution duct 4. The hanging ears 401 are used to suspend and fix the air distribution duct 4 in the space above the breeding shed with steel wire ropes.

[0030] The automatic seasonal switching device for the air ducts used in breeding sheds also includes a motor push-pull rod 1, a sliding cable assembly, and an inner duct diaphragm 5 located inside the air duct 4. The inner duct diaphragm 5 is located at the middle of the horizontal height of the air duct 4, dividing the air duct 4 into two independent spaces, upper and lower.

[0031] The zipline assembly consists of a zipline 301, a pulley 302, and a lifting device 303. The motor push-pull rod 1 is fixed to the wall or column of the breeding shed via a bracket and is located on one side of the air inlet end of the air distribution duct 4. The telescopic end of the motor push-pull rod 1 is fixedly connected to one end of the zipline 301 using a lock or clamp. The motor push-pull rod 1 drives the zipline 301 to reciprocate horizontally through its telescopic movement. The lifting device 303 is fixedly connected to the support structure above the air inlet end of the air distribution duct 4. The pulley 302 is suspended from the lower end of the lifting device 303 and remains in a free-rotating state. The other end of the zipline 301 is connected to the motor... After the push-pull rod 1 is extended, it passes through the groove of the pulley 302. The sliding cable 301 changes direction by ninety degrees at the pulley 302, changing from a horizontal direction to a vertical downward direction. Then the sliding cable 301 passes through the pipe wall of the air distribution duct 4 and enters the internal cavity of the air distribution duct 4. The sliding cable 301 is located at the end of the air distribution duct 4 near the fan 2 and is fixedly connected to the diaphragm 5 inside the air duct. Specifically, the surface of the diaphragm 5 inside the air duct is provided with a winding sliding cable 505 that extends to the edge of the perforation 506. The end of the sliding cable 301 is firmly wound with the winding sliding cable 505 and fixed on the edge of the perforation 506.

[0032] The duct inner diaphragm 5, as the core component for switching airflow channels, extends along the length of the distribution duct 4 and covers the effective air supply area of ​​the distribution duct 4. A row of counterweight bolts 502 is evenly arranged along the length of the edge of the duct inner diaphragm 5. The counterweight bolts 502 provide downward gravitational traction for the duct inner diaphragm 5. When the motor push-pull rod 1 retracts, the sliding cable 301 is tightened and overcomes the gravity of the counterweight bolts 502 to lift the duct inner diaphragm 5 upwards, thus allowing the duct inner diaphragm 5 to move upwards. The membrane 5 arches upward and adheres to the upper wall of the air distribution duct 4, thereby blocking the upper air outlet 402 from the inside. At this time, the airflow can only be discharged from the lower air outlet 403. When the motor push rod 1 extends outward, the sliding cable 301 is released, and the diaphragm 5 inside the duct falls naturally under the gravity of the counterweight bolt 502, causing the diaphragm 5 inside the duct to sink downward and adhere to the lower wall of the air distribution duct 4, thereby blocking the lower air outlet 403 from the inside. At this time, the airflow can only be discharged from the upper air outlet 402.

[0033] As a preferred embodiment, in order to ensure that the diaphragm 5 inside the duct can maintain good shape support and prevent air leakage during the switching process, a perforated edge 506 with a reinforced structure is provided at the air inlet edge of the diaphragm 5 inside the duct. A hollow channel is formed inside the perforated edge 506, and a carbon fiber strip 501 with a high elastic modulus is inserted in the channel. The carbon fiber strip 501 acts as a skeleton to support the end shape of the diaphragm 5 inside the duct. The pipe wall of the air distribution duct 4 is symmetrically provided with sliding outlets 503 at the two ends of the carbon fiber strip 501. The two ends of the carbon fiber strip 501 pass through the corresponding sliding outlets 503 and extend to the external space of the air distribution duct 4. In order to prevent the carbon fiber strip 501 from retracting into the air distribution duct 4 during the movement, anti-slip buckles 504 are fixedly connected to both ends of the carbon fiber strip 501 outside the air distribution duct 4. The outer diameter of the anti-slip buckle 504 is designed to be significantly larger than the aperture of the sliding outlet 503, thereby forming a mechanical limit and ensuring that the carbon fiber strip 501 always stays in the predetermined position and slides up and down with the diaphragm 5 inside the duct.

[0034] As another preferred embodiment, in order to improve the durability and operational stability of the device in harsh aquaculture environments, both the lifting device 303 and the sliding cable 301 are made of high-strength stainless steel wire rope. Stainless steel wire rope has excellent corrosion resistance and tensile strength. The tensile strength of the sliding cable 301 is preferably greater than or equal to 1270 MPa, which can withstand frequent pulling loads without easily breaking. The pulley 302 is made of stainless steel to prevent rust and jamming. The air distribution duct 4 and the diaphragm 5 inside the air duct are both made of flexible fabric. The density of the air distribution duct 4 is selected to be greater than or equal to 115 grams per square meter to ensure the structural strength and tear resistance of the air duct in the inflated state.

[0035] As a further preferred embodiment, in order to standardize the installation and ensure the sealing effect, the hanging ears 401 are evenly distributed along the length of the air distribution duct 4, and the distance between two adjacent hanging ears 401 is controlled within a range of less than or equal to 2 meters to prevent the air distribution duct 4 from undergoing excessive waist deformation. The upper air outlet 402 and the lower air outlet 403 are made of finished polyethylene material to ensure the stability of the shape of the air outlet. Acrylic gaskets are provided at the connection between the upper air outlet 402 and the lower air outlet 403 and the flexible pipe wall of the air distribution duct 4. The acrylic gaskets increase the local rigidity of the connection and prevent the air outlet from tearing and leaking air.

[0036] As a preferred implementation of intelligent control, the motor push-pull rod 1 is electrically connected to an environmental controller via a cable. The environmental controller has a preset temperature logic control program and is configured to monitor the ambient temperature outside the breeding shed in real time. When 14℃ < monitored temperature < 16℃, the device is considered to be in the initial mode. When the device is in the initial mode, the edge of the air inlet of the diaphragm 5 in the air duct is at the middle horizontal position of the air distribution duct 4. When the monitored temperature is ≥ 16℃, the environmental controller determines that it is in summer mode and automatically outputs a signal to control the motor push-pull rod 1 to perform the operation. The device retracts and pulls up the diaphragm 5 inside the duct to switch to downward air outlet. When the monitored temperature is ≤14℃, the environmental controller determines that it is in winter mode and automatically outputs a signal to control the motor push rod 1 to extend outward, lowering the diaphragm 5 inside the duct to switch to upward air outlet. The extension stroke of the motor push rod 1 is designed to be greater than or equal to the diameter of the air distribution duct 4 to ensure that the diaphragm 5 inside the duct can completely fit the upper or lower duct wall. The pushing and pulling forces of the motor push rod 1 are both greater than or equal to 500 Newtons to overcome the wind pressure resistance and the weight of the counterweight bolt 502.

[0037] Specifically, when the monitored temperature is ≥16℃, the environmental controller determines that it is in summer mode and automatically outputs a signal to control the motor push rod 1 to slowly and uniformly retract. The sliding cable 301 is pulled by the motor push rod 1 and retracts by the same distance in the same direction. The carbon fiber strip 501 in the diaphragm 5 and the perforated edge 506 of the air duct is lifted upward by the sliding cable 301 (the sliding cable 301 is connected to the winding sliding cable 505, which drives the diaphragm 5 and its carbon fiber strip 501 in the air duct to move accordingly) and gradually forms a semi-circular arc shape and fits against the upper pipe wall of the air distribution duct 4. After the fan 2 takes in air, the air pressure further makes the diaphragm 5 in the air duct completely fit against the upper pipe wall of the air distribution duct 4, causing the upper air outlet 402 to close and the fresh air to be discharged into the breeding house from the lower air outlet 403. When the monitored temperature is ≤14℃, the environmental controller determines that it is in winter mode and automatically outputs a signal to control the motor push rod 1 to slowly and uniformly extend outward. The sliding cable 301 is subjected to the gravity of the counterweight bolt 502 on the diaphragm 5 in the air duct and slides in the same direction for the same distance. The carbon fiber strip 501 in the diaphragm 5 and the perforated edge 506 in the air duct is subjected to the counterweight bolt 502 and gradually concaves downward to form a semi-circular arc shape and fits against the lower pipe wall of the air distribution pipe 4. After the fan 2 takes in air, the air pressure further makes the diaphragm 5 in the air duct fit against the lower pipe wall of the air distribution pipe 4, causing the lower air outlet 403 to close and the fresh air is discharged into the breeding house from the upper air outlet 402.

[0038] Working Principle: The environmental controller monitors the outside temperature changes in real time. When the temperature is ≥16℃ or ≤14℃, a command is triggered to control the motor push-pull rod 1. Power is transmitted through the sliding cable assembly (sliding cable 301, pulley 302, and hanging device 303), causing the diaphragm 5 inside the air distribution duct 4 to switch up and down, realizing the alternating opening and closing of the upper air outlet 402 and the lower air outlet 403. This, combined with the fan 2, completes the winter / summer mode switching, requiring no manual intervention throughout the process. The motor push-pull rod 1 provides the power source, the sliding cable assembly is responsible for force transmission and direction conversion, the air distribution duct 4 and the diaphragm 5 inside the duct constitute the air supply channel and switching core, and the fan 2 provides power for fresh air delivery. All components work together to meet the ventilation needs of the livestock shed in different seasons.

[0039] The motor push-pull rod 1 is installed in a suitable location within the breeding shed. Its driving voltage is 24V, and its protection level meets IP68 standards. Its extension stroke is greater than or equal to the diameter of the air distribution duct 4, and its pushing and pulling force is greater than or equal to 100N. Its operation is controlled by an environmental controller throughout. The suspension device 303 of the sliding cable assembly is made of stainless steel wire rope. It is fixedly connected to the structure above the air inlet end of the air distribution duct 4, suspending the stainless steel pulley 302 securely. One end of the stainless steel wire rope sliding cable 301 is fixedly connected to the extension end of the motor push-pull rod 1, and the other end passes through the groove of the pulley 302, changes direction, and vertically enters the air distribution duct 4, where it is wound and connected to the sliding cable 505 of the diaphragm 5 inside the duct. When the environmental controller issues a switching command, the motor push-pull rod 1 will slowly and uniformly retract or extend, thereby driving the sliding cable 301 to slide in the corresponding direction. The sliding distance of the sliding cable 301 is consistent with the extension distance of the motor push-pull rod 1, providing stable power for the switching of the diaphragm 5 inside the duct.

[0040] The air distribution duct 4 is fixed to the steel wire above each pig pen in the breeding house via plastic steel wire lugs 401. The spacing of the lugs 401 is ≤2m. Its air inlet end is fixedly connected to the fan 2 at the connection point 6. The air distribution duct 4 has a bulk density ≥115g / m³. 2The flexible fabric, with the upper air outlet 402 and lower air outlet 403 made of finished PE material with acrylic gaskets, is distributed according to the actual location of the pig pen. The diaphragm 5 inside the air duct is made of the same flexible fabric as the fabric air duct 4, extending from the air inlet end to the tail end. The air inlet end is provided with a perforated edge 506, and carbon fiber strips 501 pass through the perforated edge 506. After the two ends extend from the sliding outlet 503, they are fixedly connected to the anti-slip buckles 504 made of PVC material. A row of counterweight bolts 502 with a total weight of 1kg is evenly arranged along the edge of the diaphragm 5 inside the air duct. When the sliding cable 301 is pulled back by the motor push rod 1, it will lift the edge of the diaphragm 5 and the carbon fiber strip 501 inside the air duct, so that they gradually form a semi-circular arc and fit against the upper pipe wall of the air distribution duct 4, closing the upper air outlet 402, and fresh air will be discharged from the lower air outlet 403, switching to summer mode; when the motor push rod 1 extends outward, and the sliding cable 301 slides under the gravity of the counterweight bolt 502, the diaphragm 5 and the carbon fiber strip 501 inside the air duct will be concave downward to form a semi-circular arc and fit against the lower pipe wall of the air distribution duct 4, closing the lower air outlet 403, and fresh air will be discharged from the upper air outlet 402, switching to winter mode.

Claims

1. An automatic seasonal switching device for ventilation ducts in livestock sheds, comprising: A fan (2) and a distribution pipe (4) connected thereto, wherein a connection (6) is provided between the air inlet end of the fan (2) and the distribution pipe (4), and an upper air outlet (402) and a lower air outlet (403) are provided on the pipe wall along its length direction, and a number of hanging ears (401) are provided on the top of the outer wall of the distribution pipe (4). Its features include a motor push-pull rod (1), a sliding cable assembly, and an inner duct diaphragm (5) located inside the air distribution duct (4); The zipline assembly includes a zipline (301), a pulley (302), and a hoist (303). The motor push-pull rod (1) is fixed to the wall or column of the breeding house by a bracket. The telescopic end of the motor push-pull rod (1) is fixedly connected to one end of the zipline (301). The hoist (303) is fixedly connected above the air inlet end of the air distribution pipe (4). The pulley (302) is suspended on the hoist (303). The other end of the zipline (301) passes through the groove of the pulley (302) and through the pipe wall of the air distribution pipe (4) into the interior of the air distribution pipe (4). The zipline (301) is located inside the air distribution pipe (4) near the fan (2) and is fixedly connected to the diaphragm (5) inside the air distribution pipe.

2. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The diaphragm (5) inside the duct extends along the length of the air distribution duct (4) and is located at the middle of the horizontal height of the air distribution duct (4). The edge of the diaphragm (5) inside the duct is provided with a counterweight bolt (502). The diaphragm (5) inside the duct moves up and down inside the air distribution duct (4) by the traction of the sliding cable (301) or the gravity of the counterweight bolt (502) to selectively fit the upper or lower pipe wall of the air distribution duct (4).

3. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 2, characterized in that, The air inlet end of the diaphragm (5) in the air duct is provided with a perforated edge (506), and a carbon fiber strip (501) is inserted through the perforated edge (506). The pipe wall of the air distribution duct (4) is provided with a sliding outlet (503) corresponding to the two ends of the carbon fiber strip (501). The two ends of the carbon fiber strip (501) extend through the corresponding sliding outlet (503) to the outside of the air distribution duct (4). The two ends of the carbon fiber strip (501) located outside the air distribution duct (4) are connected with anti-slip buckles (504). The outer diameter of the anti-slip buckle (504) is larger than the aperture of the sliding outlet (503).

4. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 3, characterized in that, The surface of the diaphragm (5) inside the air duct is provided with a winding rope (505) that extends to the edge of the perforation (506). The rope (301) is wound around the winding rope (505) and fixed to the edge of the perforation (506).

5. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The lifting device (303) is made of stainless steel wire rope, the pulley (302) is made of stainless steel, and the zipline (301) extends horizontally after being led out by the motor push rod (1), and enters the air distribution pipe (4) vertically after being redirected by the pulley (302).

6. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The hanging ears (401) are distributed at intervals along the length of the air distribution pipe (4), and the distance between two adjacent hanging ears (401) is less than or equal to 2 meters. The upper air outlet (402) and the lower air outlet (403) are both made of polyethylene, and acrylic gaskets are provided at the connection between the upper air outlet (402) and the lower air outlet (403) and the air distribution pipe (4).

7. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The motor push-pull rod (1) is electrically connected to an environmental controller, which is configured to: control the motor push-pull rod (1) to retract when the monitored temperature is greater than or equal to 16 degrees Celsius, and control the motor push-pull rod (1) to extend when the monitored temperature is less than or equal to 14 degrees Celsius.

8. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The extension stroke of the motor push-pull rod (1) is greater than or equal to the diameter of the air distribution pipe (4), and the pushing force and pulling force of the motor push-pull rod (1) are both greater than or equal to 500 Newtons.

9. The automatic seasonal switching device for ventilation ducts in livestock sheds according to claim 1, characterized in that, The air duct (4) and the diaphragm (5) inside the air duct are both made of flexible fabric, and the bulk density of the air duct (4) is greater than or equal to 115 grams per square meter. The zipline (301) is made of stainless steel wire rope with a tensile strength greater than or equal to 1270 MPa.

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