Livestock breeding house ventilation device with adjustable ventilation volume

By using a symmetrical arrangement of a first and second fan in the ventilation system of livestock sheds, controlling the angle of the ventilation plate with a drive wheel, and enhancing stability through connecting structures and stainless steel materials, the problems of high noise and severe shaking of the ventilation system have been solved, thus improving the flexibility and stability of the device.

CN224290935UActive Publication Date: 2026-05-29DUNHUANG NANHUA ANIMAL HUSBANDRY CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
DUNHUANG NANHUA ANIMAL HUSBANDRY CO LTD
Filing Date
2025-05-07
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing ventilation systems for livestock sheds are noisy and vibrate significantly during ventilation adjustment, and their stability and lifespan are relatively short.

Method used

The device employs a symmetrical arrangement of a first and second fan, controls the angle of multiple ventilation plates via a drive wheel, and secures the fans using connecting protrusions, connecting blocks, and a fixed frame to enhance the stability and flexibility of the device. A shielding frame is also provided to prevent livestock from touching the fan, and stainless steel is used to improve structural strength.

Benefits of technology

It enhances the flexibility and stability of the ventilation system, reduces noise and shaking caused by concentrated airflow, extends the service life of the system, and improves the efficiency and safety of component installation.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224290935U_ABST
Patent Text Reader

Abstract

The utility model belongs to the field of livestock breeding house ventilation technology, concretely is a kind of livestock breeding house ventilation device of adjustable ventilation, including wind box, the inside of wind box is provided with first fan and second fan;The inside wall of wind box is fixed with driving wheel;The output end of driving wheel is fixed with transmission wheel;The inside wall of wind box is rotatably connected with transmission shaft, the both ends of transmission shaft are through the side wall of wind box;The side wall of transmission shaft is fixed with ventilation plate;The end of transmission shaft is fixed with transmission wheel, and transmission track is set between the transmission wheel of correspondence;The utility model is ventilated by setting first fan and second fan, and the angle of multiple ventilation plates is controlled by setting driving wheel, and then the ventilation of device is controlled, the flexibility of ventilation device is enhanced, the airflow concentration problem of the ventilation device of single baffle regulating ventilation is solved, and the service life of device is extended.
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Description

Technical Field

[0001] This utility model belongs to the field of ventilation technology for livestock breeding sheds, specifically a ventilation device for livestock breeding sheds with adjustable ventilation volume. Background Technology

[0002] Ventilation devices are equipment used for ventilation. Ventilation, also known as air exchange, is the process of mechanically or naturally introducing sufficient fresh air into an indoor space while simultaneously expelling polluted air that does not meet hygiene requirements, so that the indoor air meets hygiene requirements and the needs of the production process. All facilities in a building that perform ventilation work are collectively referred to as ventilation equipment.

[0003] Existing ventilation systems for livestock farms often use a rotating partition to control the airflow through the inlet, thereby controlling the ventilation volume. However, as the air passes through such adjustable ventilation systems, the airflow is affected by the single partition and impacts specific locations on the inner wall of the system, ultimately resulting in significant noise and severe shaking.

[0004] Therefore, this utility model provides a ventilation device for livestock breeding sheds with adjustable ventilation volume. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A ventilation device for livestock sheds with adjustable ventilation volume, comprising a wind box, inside which a first fan and a second fan are arranged symmetrically; a drive wheel is fixedly connected to the inner side wall of the wind box; a transmission wheel is fixedly connected to the output end of the drive wheel; a transmission shaft is rotatably connected to the inner side wall of the wind box, with both ends of the transmission shaft penetrating the side wall of the wind box, and three transmission shafts are arranged in a linear array; a ventilation plate is fixedly connected to the side wall of the transmission shaft; a transmission wheel is fixedly connected to the end of the transmission shaft, and a transmission track is provided between the corresponding transmission wheels; this step, by setting up the first and second fans for ventilation and by setting up the drive wheel to control the angle of multiple ventilation plates, controls the ventilation volume of the device, enhances the flexibility of the ventilation device, helps solve the problem of airflow concentration in ventilation devices with single-plate ventilation volume adjustment, and helps extend the service life of the device.

[0007] Preferably, connecting protrusions are fixed to the side walls of the first and second fans, and the plurality of connecting protrusions are arranged in a circumferential array; connecting blocks are fixed to the side walls of the connecting protrusions, and fixing frames are fixed to the ends of the plurality of connecting blocks away from the connecting protrusions; fixing plates are fixed to the side walls of the fixing frames; fixing grooves are formed on the side walls of the air box, and the fixing grooves are set to correspond to the size of the fixing frames; a first fixing platform is fixed to the inner side wall of the air box, and the first fixing platform is set to correspond to the position of the fixing groove and the size of the fixing plates; this step, by setting connecting protrusions, connecting blocks, and fixing frames to fix the first and second fans, enhances the stability of the ventilation device and helps to extend the service life of the device. By setting fixing grooves, fixing plates, and the first fixing platform to complete the final fixing of the first and second fans, the flexibility of the device is enhanced, which helps to improve the component installation efficiency of the workers.

[0008] Preferably, a second fixing platform is fixedly connected to the inner side wall of the bellows; a filter frame is provided on the side wall of the second fixing platform; a filter screen is fixedly connected to the side wall of the filter frame; this step, by setting the second fixing platform to fix the filter frame and the filter screen, prevents large objects from entering the breeding house through the bellows, avoids damage to the first and second fans by foreign objects, reduces safety hazards, helps maintain the stable operation of the ventilation device, and reduces the maintenance requirements of the device.

[0009] Preferably, a fixing protrusion is fixedly connected to the side wall of the bellows; a rotating block is rotatably connected inside the fixing protrusion, and the two rotating blocks are symmetrically arranged; a shielding frame is fixedly connected to the side wall of the two rotating blocks; a shielding plate is fixedly connected to the side wall of the shielding frame, and multiple shielding plates are arranged in a linear array; this step prevents livestock from touching the first and second fans by setting shielding plates, and enables the shielding frame to rotate by setting the fixing protrusion and rotating block, which facilitates the cleaning of the inside of the device by the staff, reduces safety hazards, and helps protect the safety of livestock.

[0010] Preferably, a movable block is slidably connected to the side wall of the shielding frame, and the two movable blocks are symmetrically arranged; a control rod is fixedly connected to the side wall of the movable block, and the control rod passes through the side wall of the shielding frame; a return spring is fixedly connected between the movable block and the shielding frame; a limiting protrusion is fixedly connected to the side wall of the air box, and the two limiting protrusions are set to correspond to the position and size of the movable block; this step fixes the shielding frame to the side wall of the air box by setting an automatic fixing assembly composed of movable blocks, control rods, return springs, and limiting protrusions, thereby preventing the shielding frame from rotating under external force, improving the stability and practicality of the device, and facilitating the cleaning work inside the device for the staff.

[0011] Preferably, a reinforcing block is fixed to the side wall of the shielding frame, and the two reinforcing blocks are arranged symmetrically. This step enhances the structural strength of the device by setting the reinforcing blocks, which helps to prevent the shielding sheet from being damaged by livestock accidental contact, further improving the safety of the device and protecting the safety of livestock.

[0012] Preferably, the bellows, drive shaft, ventilation plate, and fixed frame are made of stainless steel. This step enhances the structural strength and stability of the device by using stainless steel for the bellows, drive shaft, ventilation plate, and fixed frame, which helps to extend the service life of the device.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The adjustable ventilation device for livestock sheds described in this utility model uses a first fan and a second fan for ventilation and air exchange, and a drive wheel to control the angle of multiple ventilation plates, thereby controlling the ventilation volume of the device. This enhances the flexibility of the ventilation device, helps solve the problem of airflow concentration in ventilation devices with single-plate ventilation volume adjustment, and helps extend the service life of the device.

[0015] 2. The adjustable ventilation device for livestock sheds described in this utility model enhances the stability of the ventilation device by setting connecting protrusions, connecting blocks, and a fixing frame to fix the first fan and the second fan, which helps to extend the service life of the device. The first fan and the second fan are finally fixed by setting fixing grooves, fixing plates, and a first fixing platform, which enhances the flexibility of the device and helps to improve the efficiency of component installation by the staff. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a schematic diagram of the fixed frame structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the filter screen in this utility model;

[0020] Figure 4 This is a schematic diagram of the ventilation plate in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the shielding frame in this utility model.

[0022] In the diagram: 1. Air box; 11. First fan; 12. Second fan; 13. Drive shaft; 14. Ventilation plate; 15. Drive wheel; 16. Drive track; 17. Drive wheel; 2. Connecting protrusion; 21. Connecting block; 22. Fixed frame; 23. Fixed plate; 24. Fixed groove; 25. First fixed platform; 3. Second fixed platform; 31. Filter frame; 32. Filter screen; 4. Fixed protrusion; 41. Rotating block; 42. Baffle frame; 43. Baffle plate; 5. Movable block; 51. Control rod; 52. Return spring; 53. Limiting protrusion; 6. Reinforcing block. Detailed Implementation

[0023] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Specific implementation examples are given below.

[0025] like Figures 1 to 4As shown in the figure, an adjustable ventilation device for livestock sheds according to an embodiment of the present invention includes a wind box 1. A first fan 11 and a second fan 12 are arranged symmetrically inside the wind box 1. A drive wheel 17 is fixedly connected to the inner wall of the wind box 1. A transmission wheel 15 is fixedly connected to the output end of the drive wheel 17. A transmission shaft 13 is rotatably connected to the inner wall of the wind box 1. Both ends of the transmission shaft 13 penetrate the side wall of the wind box 1, and the three transmission shafts 13 are arranged in a linear array. A ventilation plate 14 is fixedly connected to the side wall of shaft 13; a transmission wheel 15 is fixedly connected to the end of transmission shaft 13, and a transmission track 16 is provided between corresponding transmission wheels 15; during operation, the operator can control the angle of multiple ventilation plates 14 by driving the drive wheel 17, thereby controlling the ventilation volume of the air box 1. During the process, whenever the drive wheel 17 fixed inside the air box 1 is driven, the transmission wheel 15 fixed to the output end of the drive wheel 17 will rotate. At this time, due to the multiple corresponding transmission wheels 15 being provided with... The power of the drive belt 16 and the drive wheel 17 is first transmitted from the drive wheel 15 at its output end to the adjacent drive wheel 15. Subsequently, the drive shaft 13, which is fixed to the drive wheel 15, and the ventilation plate 14 fixed to the side wall of the drive shaft 13 will rotate. At the same time, since the corresponding ends of the other two drive shafts 13 are also fixed to drive wheels 15, and the corresponding drive wheels 15 are also provided with drive belts 16, the angles of the three ventilation plates 14 will be synchronously avoided with the drive wheel 17. When the three ventilation plates 14 reach a parallel state synchronously, the ventilation volume of the ventilation device will reach its maximum value. The first fan 11 and the second fan 12 play a ventilation role. This step, by setting the first fan 11 and the second fan 12 for ventilation and by setting the drive wheel 17 to control the angle of multiple ventilation plates 14, controls the ventilation volume of the device, enhances the flexibility of the ventilation device, helps to solve the problem of airflow concentration in ventilation devices with single-plate ventilation volume adjustment, and helps to extend the service life of the device.

[0026] like Figure 2 and Figure 3As shown, connecting protrusions 2 are fixed to the side walls of the first fan 11 and the second fan 12, and multiple connecting protrusions 2 are arranged in a circumferential array; connecting blocks 21 are fixed to the side walls of the connecting protrusions 2, and fixing frames 22 are fixed to the ends of multiple connecting blocks 21 away from the connecting protrusions 2; fixing plates 23 are fixed to the side walls of the fixing frames 22; fixing grooves 24 are provided on the side walls of the air box 1, and the fixing grooves 24 are set to correspond to the size of the fixing frames 22; a first fixing platform 25 is fixed to the inner side wall of the air box 1, and the first fixing platform 25 is set to correspond to the position of the fixing grooves 24 and the size of the fixing plates 23; during operation, the operator can use the fixing frames 22 to install the first fan 11 and the second fan 12 in a predetermined position. In the process, the operator can first use the multiple connecting protrusions 2 fixed to the side walls of the first fan 11 and the second fan 12 to fix them. In the middle of the corresponding connecting block 21, the worker can then place the entire fixing frame 22 into the air box 1. Since the fixing groove 24 is set to correspond to the size and position of the fixing frame 22, the worker can place the fixing frame 22 into the fixing groove 24. After the fixing frame 22 is placed, the fixing piece 23 fixed to the side wall of the fixing frame 22 will contact the side wall of the first fixing platform 25. The worker can then complete the final fixing with bolts. This step, by setting the connecting protrusion 2, connecting block 21, and fixing frame 22 to fix the first fan 11 and the second fan 12, enhances the stability of the ventilation device and helps to extend the service life of the device. By setting the fixing groove 24, fixing piece 23, and first fixing platform 25 to complete the final fixing of the first fan 11 and the second fan 12, the flexibility of the device is enhanced, which helps to improve the efficiency of the worker's component installation.

[0027] like Figure 3 As shown, a second fixed platform 3 is fixedly connected to the inner wall of the bellows 1; a filter frame 31 is provided on the side wall of the second fixed platform 3; a filter screen 32 is fixedly connected to the side wall of the filter frame 31; during operation, the second fixed platform 3 and the filter frame 31 are connected by bolts, and the operator can use the bolts to fix the filter frame 31 to the side wall of the second fixed platform 3, thereby fixing the filter screen 32 inside the bellows 1; this step, by setting the second fixed platform 3 to fix the filter frame 31 and the filter screen 32, prevents large objects from entering the breeding house through the bellows 1, avoids damage to the first fan 11 and the second fan 12 by foreign objects, reduces safety hazards, helps maintain the stable operation of the ventilation device, and reduces the maintenance requirements of the device.

[0028] like Figure 5As shown, a fixed protrusion 4 is fixedly connected to the side wall of the bellows 1; a rotating block 41 is rotatably connected inside the fixed protrusion 4, and the two rotating blocks 41 are symmetrically arranged; a shielding frame 42 is fixedly connected to the side wall of the two rotating blocks 41; a shielding plate 43 is fixedly connected to the side wall of the shielding frame 42, and multiple shielding plates 43 are arranged in a linear array; during operation, since the rotating block 41 is rotatably connected to the fixed protrusion 4, and the rotating block 41 is fixedly connected to the shielding frame 42, the operator can rotate the shielding frame 42, thereby directing the airflow... The end of box 1 located inside the breeding shed is opened, and the inside of box 1 is cleaned. Multiple shielding plates 43 fixed to the side wall of shielding frame 42 can prevent livestock from touching the first fan 11 and the second fan 12. This step prevents livestock from touching the first fan 11 and the second fan 12 by setting shielding plates 43, and enables the shielding frame 42 to rotate by setting fixed protrusions 4 and rotating blocks 41, which facilitates the cleaning of the inside of the device by the staff, reduces safety hazards, and helps protect the safety of livestock.

[0029] like Figure 5 As shown, movable blocks 5 are slidably connected to the side wall of the shielding frame 42, and the two movable blocks 5 are symmetrically arranged; a control rod 51 is fixedly connected to the side wall of the movable block 5, and the control rod 51 passes through the side wall of the shielding frame 42; a return spring 52 is fixedly connected between the movable block 5 and the shielding frame 42; a limit protrusion 53 is fixedly connected to the side wall of the air box 1, and the two limit protrusions 53 are set to correspond to the position and size of the movable block 5; during operation, the operator can use the automatic fixing assembly composed of movable blocks 5, control rod 51, return spring 52, and limit protrusions 53 to fix the shielding frame 42. During the process, whenever the shielding frame 42 is about to close, the two movable blocks 5 slidably connected to the side wall of the shielding frame 42 will respectively contact the surfaces of the two limit protrusions 53. At this point, the two movable blocks 5 will compress the return spring 52 fixed between themselves and the shielding frame 42. As the return spring 52 is compressed, the movable blocks 5 will enter the interior of the shielding frame 42. After the shielding frame 42 is completely closed, the movable blocks 5 will be reset under the elastic force of the return spring 52 and finally enter the interior of the limiting protrusion 53, completing the fixing action of the shielding frame 42. This step fixes the shielding frame 42 to the side wall of the air box 1 by setting an automatic fixing assembly composed of movable blocks 5, control rod 51, return spring 52, and limiting protrusion 53, thereby preventing the shielding frame 42 from rotating under the action of external force, improving the stability and practicality of the device, and facilitating the cleaning work inside the device for the staff.

[0030] like Figure 1As shown, a reinforcing block 6 is fixedly connected to the side wall of the shielding frame 42, and the two reinforcing blocks 6 are arranged symmetrically. During operation, the two reinforcing blocks 6 are fixedly connected to multiple shielding plates 43 respectively. The two reinforcing blocks 6 can increase the stability of multiple shielding plates 43 by themselves. This step enhances the structural strength of the device by setting the reinforcing blocks 6, which helps to prevent the shielding plates 43 from being damaged by livestock accidental contact, further improving the safety of the device and protecting the safety of livestock.

[0031] like Figures 1 to 5 As shown, the bellows 1, drive shaft 13, ventilation plate 14, and fixed frame 22 are made of stainless steel. During operation, the stainless steel bellows 1, drive shaft 13, ventilation plate 14, and fixed frame 22 can maintain a smooth surface for a long time, preventing components from jamming and leveraging the corrosion resistance of stainless steel. This step, by using stainless steel for the bellows 1, drive shaft 13, ventilation plate 14, and fixed frame 22, enhances the structural strength and stability of the device, which helps to extend the service life of the device.

[0032] During operation, the operator can control the angle of multiple ventilation plates 14 by driving the drive wheel 17, thereby controlling the ventilation volume of the air box 1. During this process, whenever the drive wheel 17, fixed inside the air box 1, is driven, the transmission wheel 15 fixed to the output end of the drive wheel 17 will rotate. At this time, since a transmission track 16 is provided between the multiple corresponding transmission wheels 15, the power of the drive wheel 17 will first be transmitted from its output end transmission wheel 15 to the adjacent transmission wheel 15. Subsequently, the transmission shaft 13, which is fixed to the transmission wheel 15, and the ventilation plates 14 fixed to the side wall of the transmission shaft 13 will rotate. Simultaneously, since the corresponding ends of the other two transmission shafts 13 are also fixed to transmission wheels 15, and the corresponding transmission wheels 15 are... The device is equipped with a transmission track 16. Driven by the drive wheel 17, the angles of the three ventilation plates 14 will synchronize. When the three ventilation plates 14 reach a parallel state, the ventilation volume of the ventilation device will reach its maximum value. The first fan 11 and the second fan 12 provide ventilation. The operator can install the first fan 11 and the second fan 12 in a predetermined position using the fixing frame 22. During the process, the operator can first use multiple connecting protrusions 2 fixed to the side walls of the first fan 11 and the second fan 12 to fix them to the middle of the corresponding connecting blocks 21. Then, the operator can put the fixing frame 22 into the air box 1. Since the fixing groove 24 is set to correspond to the size and position of the fixing frame 22, the operator can fix the... The frame 22 is placed into the fixing slot 24. After the frame 22 is placed, the fixing piece 23 fixed to the side wall of the frame 22 will contact the side wall of the first fixing platform 25. The operator can complete the final fixing with bolts. The second fixing platform 3 is connected to the filter frame 31 with bolts. The operator can use bolts to fix the filter frame 31 to the side wall of the second fixing platform 3, thereby fixing the filter screen 32 inside the bellows 1. Since the rotating block 41 and the fixing protrusion 4 are rotatably connected, and the rotating block 41 is fixedly connected to the shielding frame 42, the operator can rotate the shielding frame 42 to open the end of the bellows 1 inside the breeding house and clean the inside of the bellows 1. Among them, multiple shielding pieces fixed to the side wall of the shielding frame 42 43 prevents livestock from touching the first fan 11 and the second fan 12. Workers can use an automatic fixing assembly consisting of movable blocks 5, control rods 51, return springs 52, and limiting protrusions 53 to fix the shielding frame 42. During the process, whenever the shielding frame 42 is about to close, the two movable blocks 5, slidably connected to the side wall of the shielding frame 42, will respectively contact the surfaces of the two limiting protrusions 53. At this time, the two movable blocks 5 will compress the return springs 52 fixed between themselves and the shielding frame 42. As the return springs 52 are compressed, the movable blocks 5 will enter the interior of the shielding frame 42. After the shielding frame 42 is completely closed, the movable blocks 5 will reset under the elastic force of the return springs 52 and finally enter the interior of the limiting protrusions 53, completing the fixing action of the shielding frame 42.Two reinforcing blocks 6 are fixedly connected to multiple shielding plates 43. The two reinforcing blocks 6 can increase the stability of the multiple shielding plates 43. The stainless steel bellows 1, drive shaft 13, ventilation plate 14, and fixing frame 22 can maintain a smooth surface for a long time, preventing components from jamming and leveraging the corrosion resistance of stainless steel.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A ventilation device for livestock sheds with adjustable ventilation volume, comprising a bellows (1), characterized in that: The bellows (1) is equipped with a first fan (11) and a second fan (12), which are arranged symmetrically. A drive wheel (17) is fixedly connected to the inner side wall of the bellows (1). A transmission wheel (15) is fixedly connected to the output end of the drive wheel (17). A transmission shaft (13) is rotatably connected to the inner side wall of the bellows (1). Both ends of the transmission shaft (13) penetrate the side wall of the bellows (1), and the three transmission shafts (13) are arranged in a linear array. A ventilation plate (14) is fixedly connected to the side wall of the transmission shaft (13). A transmission wheel (15) is fixedly connected to the end of the transmission shaft (13), and a transmission track (16) is provided between the corresponding transmission wheels (15).

2. The adjustable ventilation device for livestock sheds according to claim 1, characterized in that: The first fan (11) and the second fan (12) are fixedly connected to the side walls of the fan and the connecting protrusions (2) are arranged in a circular array. The connecting protrusions (2) are fixedly connected to the side walls of the connecting protrusions (2) and the ends of the connecting blocks (21) away from the connecting protrusions (2) are fixedly connected to the fixed frames (22). The fixed frames (22) are fixedly connected to the side walls of the fixed frames (22). The side walls of the air box (1) are provided with fixed grooves (24) and the fixed grooves (24) are set to the size of the fixed frames (22). The inner side walls of the air box (1) are fixedly connected to the first fixed platform (25) and the first fixed platform (25) is set to the position of the fixed grooves (24) and the size of the fixed platform (23).

3. The adjustable ventilation device for livestock sheds according to claim 2, characterized in that: A second fixed platform (3) is fixedly connected to the inner side wall of the air box (1); a filter frame (31) is provided on the side wall of the second fixed platform (3); a filter screen (32) is fixedly connected to the side wall of the filter frame (31).

4. The adjustable ventilation device for livestock sheds according to claim 3, characterized in that: A fixed protrusion (4) is fixedly connected to the side wall of the bellows (1); a rotating block (41) is rotatably connected inside the fixed protrusion (4), and the two rotating blocks (41) are symmetrically arranged; a shielding frame (42) is fixedly connected to the side wall of the two rotating blocks (41); a shielding plate (43) is fixedly connected to the side wall of the shielding frame (42), and a plurality of shielding plates (43) are arranged in a linear array.

5. A livestock shed ventilation device with adjustable ventilation volume according to claim 4, characterized in that: A movable block (5) is slidably connected to the side wall of the shielding frame (42), and the two movable blocks (5) are symmetrically arranged; a control rod (51) is fixedly connected to the side wall of the movable block (5), and the control rod (51) passes through the side wall of the shielding frame (42); a return spring (52) is fixedly connected between the movable block (5) and the shielding frame (42); a limiting protrusion (53) is fixedly connected to the side wall of the bellows (1), and the two limiting protrusions (53) are set to correspond to the position and size of the movable block (5).

6. A livestock shed ventilation device with adjustable ventilation volume according to claim 5, characterized in that: A reinforcing block (6) is fixed to the side wall of the shielding frame (42), and the two reinforcing blocks (6) are arranged symmetrically.

7. A livestock shed ventilation device with adjustable ventilation volume according to claim 1, characterized in that: The air box (1), drive shaft (13), ventilation plate (14), and fixed frame (22) are made of stainless steel.