Automatic-adjusting multifunctional air conditioning unit for low-temperature grain storage

Abstract

The invention relates to the technical field of air conditioning unit equipment, in particular to an automatically-adjusted multifunctional low-temperature grain storage air conditioning unit which comprises an air conditioning unit body and a fan at the top of the air conditioning unit body. The top of the fan is covered with a housing, the housing is covered with an inner filter cylinder, and the inner filter cylinder is detachably connected with the upper surface of the body. Vertical plates are arranged on the periphery of the inner filter cylinder, the lower surfaces of the vertical plates are fixedly connected to the upper surface of the body, a splicing plate is arranged between every two vertical plates, positioning plates are fixedly connected to the two sides of each splicing plate, one side of each positioning plate is slidably attached to the corresponding vertical plate, and the other side of each positioning plate is pressed through a fixing assembly. A sealing cover plate is detachably mounted on the upper surface of the splice plate, an outer filter plate is fixedly mounted at the bottom of the positioning plate, and a guide plate is arranged on one side of the top of the outer filter plate and is in foldable connection with the top of the splice plate through a folding assembly. The internal and external multi-filtering structure obstructs impurities, reduces load, prolongs service life and reduces maintenance frequency. The modular design and the rainy day diversion function improve the environmental adaptability and the operation continuity, and improve the maintenance efficiency and the use convenience.

Description

Technical Field

[0001] This invention relates to the field of air conditioning unit equipment technology, specifically to an automatically adjustable multi-functional low-temperature grain storage air conditioning unit. Background Technology

[0002] In the grain storage sector, maintaining a suitable low-temperature environment for grain piles is crucial for ensuring grain quality and inhibiting the growth of insects and mold. Multifunctional low-temperature grain storage air conditioning units are key equipment developed to achieve this goal. Their core principle lies in guiding airflow through a fan, transforming the air into process air conforming to set parameters after passing through the unit's cooling, humidification, and temperature control modules. This air is then transported via ducts to specific areas within the grain silo, achieving multiple functions such as overall silo cooling, localized temperature control, moisture regulation, and even gas composition management. These units typically possess multiple standardized operating modes, automatically or manually switching between conditions such as fresh air circulation, floor ventilation, and grain surface temperature control, depending on different grain storage stages and external climate conditions, to meet complex grain storage process requirements.

[0003] In existing technologies, multi-functional low-temperature grain storage air conditioning units with automatic adjustment functions generally rely on ambient air as the treated air. The equipment typically has built-in or external fans that draw in outside air or air from inside the storage silo. The drawn-in air then flows through a series of functional modules, such as evaporators for heat exchange and humidifiers or dehumidifiers for humidity control. Through the coordinated work of these modules, the air is processed through cooling, heating, or humidity regulation, ultimately delivering the processed air to the grain pile at a specific temperature and humidity to adapt to different storage conditions in different seasons and grain conditions.

[0004] However, although existing air conditioning units are equipped with internal filter modules to intercept dust and impurities in the air and protect delicate internal components, the initial air intake stage often relies solely on a simple protective mesh or fan cover with large openings for preliminary blocking, resulting in limited filtration accuracy. This allows a large amount of fine dust and lightweight impurities to easily penetrate this initial protection and directly reach and adhere to the more crucial filter module inside the unit. This places an excessive load on the main filter module, accelerating its clogging process, reducing its lifespan, and forcing users to frequently shut down the unit for cleaning or replacement, significantly increasing maintenance labor intensity and time costs, ultimately affecting the continuity of equipment operation and overall efficiency. Therefore, this invention proposes an automatically adjustable, multi-functional low-temperature grain storage air conditioning unit to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an automatically adjustable, multifunctional air conditioning unit for low-temperature grain storage, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatically adjustable multi-functional low-temperature grain storage air conditioning unit, comprising: an air conditioning unit body and a fan fixedly installed on the top of the air conditioning unit body, the top of the fan being covered with a cover, an inner filter cylinder being covered outside the cover, and the inner filter cylinder being detachably connected to the upper surface of the air conditioning unit body. The inner filter cartridge is surrounded by upright plates. The lower surface of each upright plate is fixedly connected to the upper surface of the air conditioning unit body. A splicing plate is provided between every two upright plates. Positioning plates are fixedly connected to both sides of each splicing plate. One side of the positioning plate is slidably attached to the upright plate. The other side of the positioning plate is provided with a fixing component for pressing the positioning plate against one side of the upright plate. A sealing cover plate can be detachably installed on the upper surface of the splicing block. An external filter plate is fixedly installed at the bottom of the positioning plate, and a guide plate is provided on one side of the top of the external filter plate. One side of the guide plate can be folded and connected to the top side of the splicing plate via a folding assembly. Preferably, the bottom of the air conditioning unit body is fixedly installed in a concrete base, and air ducts are fixedly fitted on both sides of the air conditioning unit body. An annular groove is opened at the center of the upper surface of the air conditioning unit body, and the annular groove is slidably inserted into the sealing ring fixedly connected to the lower surface of the inner filter cartridge.

[0007] Preferably, the upper surface of the inner filter cartridge abuts against the bottom end of the pressure column, the upper surface of the pressure column is fixedly connected to the center of the sealing cover plate, positioning columns are fixedly connected around the sealing cover plate, the positioning columns are slidably inserted into the positioning grooves opened on the upper surface of the upright plate, and a rainwater sensor is fixedly installed on the top of the sealing cover plate.

[0008] Preferably, a limiting post is fixedly connected to the lower surface of the positioning plate, and a limiting groove is opened on the upper surface of the air conditioning unit body at the position corresponding to the limiting post. The limiting groove and the limiting post are slidably inserted together. The fixing component includes a support plate, and the bottom end of the support plate is fixedly connected to the upper surface of the air conditioning unit body.

[0009] Preferably, a through hole is provided on one side of the top of the support plate, and a groove is provided on the other side of the top of the support plate. A fixing seat is provided on the upper side of the through hole. The fixing seat is rotatably connected to the middle of the hook plate through a first limiting pin. A limiting hole is provided at the bottom of the hook plate. A limiting block is provided on one side of the bottom of the hook plate. The limiting block is fixedly installed on the support plate. An adjusting column is threadedly connected on one side of the limiting block. The adjusting column and the limiting hole are slidably inserted into each other.

[0010] Preferably, the top of the hook plate is rotatably connected to one end of the connecting plate via a second limiting pin, and the other end of the connecting plate is rotatably connected to the middle of the adjusting block via a third limiting pin. The adjusting block is slidably connected to the slide rail fixedly connected to the top of the support plate via a slider fixedly installed at its bottom.

[0011] Preferably, pressure rods are fixedly connected to both the top and bottom sides of the adjusting block, and several pressure blocks are fixedly connected to one side of the pressure rods, with the pressure blocks and the positioning plate being press-fitted together.

[0012] Preferably, the folding assembly includes a fixing plate, one side of which is fixedly connected to the splicing plate, and the other side of which is rotatably connected to one end of the first link and the second link respectively via fixing pins. The other ends of the first link and the second link are both fixedly connected to one side of the moving plate via connecting pins, and the other side of the moving plate is fixedly connected to the guide plate.

[0013] Preferably, a plurality of guide grooves are provided on one side of the guide plate, a stop bar is fixedly installed on the side of the fixing plate near the top of the first connecting rod, and a lower locking pin is fixedly installed on the side of the fixing plate near the bottom of the second connecting rod.

[0014] Preferably, an upper locking pin is fixedly installed on the side of the movable plate near the top of the second connecting rod, and the lower locking pin is fixedly connected to the upper locking pin by a tension spring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By adding an outer filter plate that can be quickly spliced ​​and installed on the outside of the inner filter structure, multiple filtration barriers are formed, which can effectively block most of the dust and impurities in the outside air, significantly reduce the load on the internal air conditioning unit filter module, extend its service life, and reduce the number of times that need to be stopped for cleaning and maintenance due to frequent clogging, thereby improving the continuity and stability of equipment operation and reducing manual maintenance costs.

[0016] 2. Through the combination of the foldable flow-guiding structure and the rain sensor, it can be deployed in time during rainy weather to form a flow-guiding protection, reducing the risk of rainwater seeping into the equipment. At the same time, the outer filter structure adopts a modular design, which is convenient for quick installation, disassembly and cleaning, further reducing the difficulty of maintenance and improving the adaptability of the equipment under different environmental conditions and the overall efficiency of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is a bottom view of the overall structure of the present invention; Figure 4 This is a top view of the internal structure of the present invention; Figure 5 This is a side view of the internal structure of the present invention; Figure 6 This is a bottom view of the internal structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Air conditioning unit body; 2. Fan; 3. Casing; 4. Inner filter cartridge; 5. Vertical plate; 6. Splicing plate; 7. Positioning plate; 8. Sealing cover plate; 9. Outer filter plate; 10. Guide plate; 11. Concrete base; 12. Air duct; 13. Annular groove; 14. Sealing ring; 15. Pressure column; 16. Positioning column; 17. Positioning groove; 18. Rainwater sensor; 19. Limiting column; 20. Limiting groove; 21. 22. Support plate; 23. Through hole; 24. Groove; 25. Fixing base; 26. Hook plate; 27. Limiting hole; 28. Limiting block; 29. ​​Adjusting column; 30. Connecting plate; 31. Adjusting block; 32. Pressure rod; 33. Pressure block; 34. Fixing plate; 35. First connecting rod; 36. Second connecting rod; 37. Moving plate; 38. Guide groove; 39. Stop bar; 40. Lower locking pin; 41. Upper locking pin; 42. Tension spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 8This invention provides a technical solution: an automatically adjustable multi-functional low-temperature grain storage air conditioning unit, comprising: an air conditioning unit body 1 and a fan 2 fixedly installed on the top of the air conditioning unit body 1. The air conditioning unit body 1 and the fan 2 are electrically connected to external control equipment, so that the air can be cooled, heated, or humidified through the fan 2 and the air conditioning unit body 1 in conjunction with other modules. The top of the fan 2 is covered with a cover 3, which provides initial protection for the fan 2 and also provides initial dust prevention. An inner filter 4 is installed on the outside of the cover 3. The inner filter 4 is detachably connected to the upper surface of the air conditioning unit body 1. By installing the inner filter 4 on the outside of the cover 3, a filter layer is formed to block dust and other impurities. Vertical plates 5 are arranged around the inner filter 4. The vertical plates 5 are triangular prisms. The lower surface of each vertical plate 5 is fixedly connected to the upper surface of the air conditioning unit body 1. Every two vertical plates 5 Each of the four sections is equipped with a splicing plate 6, arranged in a rectangular pattern. Each splicing plate 6 has a positioning plate 7 fixedly connected to both sides. One side of the positioning plate 7 slides against the upright plate 5, facilitating quick positioning of the splicing plate 6. The other side of the positioning plate 7 has a fixing component for pressing it against the upright plate 5. A sealing cover 8 is detachably installed on the upper surface of the splicing plate 6, sealing the top of the four splicing plates 6 to prevent impurities from entering the inner filter cartridge 4 from the top. An outer filter plate 9 is fixedly installed at the bottom of the positioning plate 7, forming another filter layer to filter dust and other impurities. A guide plate 10 is installed on one side of the top of the outer filter plate 9, guiding rainwater in rainy weather. One side of the guide plate 10 is foldably connected to the top side of the splicing plate 6 via a folding component.

[0021] In operation, to prevent large amounts of dust or impurities from directly entering the filter module inside the air conditioning unit 1 through the fan 2, an inner filter cartridge 4 is first installed on the upper side of the top cover 3 of the fan 2. Then, four splicing plates 6 are spliced ​​together by the sliding cooperation of four vertical plates 5 and positioning plates 7. At the same time, sealing cover plates 8 are attached to the top of the four splicing plates 6 to form a hollow space. The positioning plates 7 are fixed by fixing components, and then the splicing plates 6 are stably fixed around the inner filter cartridge 4. At this time, four outer filter plates 9 are set around the inner filter cartridge 4. When the fan 2 is started, the outside air will first pass through the preliminary filtration of the outer filter plates 9 before entering the fan 2, filtering out larger dust or impurities. Then, it will pass through the inner filter cartridge 4 for further filtration, further reducing the amount of dust or impurities entering the air conditioning unit 1. This reduces the load on the air conditioning unit 1, slows down its clogging process, extends its service life, avoids the trouble of frequent shutdowns and cleaning or replacement, and reduces maintenance time and costs.

[0022] The air conditioning unit body 1 is fixedly installed in a concrete base 11 at its bottom. The concrete base 11 provides fixed support for the bottom of the air conditioning unit body 1, thereby ensuring its stability. Air ducts 12 are fixedly fitted on both sides of the air conditioning unit body 1, through which treated air is delivered. An annular groove 13 is formed at the center of the upper surface of the air conditioning unit body 1. The annular groove 13 is slidably inserted into a sealing ring 14 fixedly connected to the lower surface of the inner filter cartridge 4. When the inner filter cartridge 4 is covered by the outer casing 3, the sealing ring 14 fixedly connected to its bottom is inserted into the annular groove 13, thereby improving the sealing between the inner filter cartridge 4 and the casing 3 and reducing dust from entering the fan 2 through the bottom gap of the inner filter cartridge 4. The upper surface of the inner filter cartridge 4 abuts against the bottom end of the pressure column 15, and the upper surface of the pressure column 15 abuts against the sealing ring 14. The cover plate 8 is fixedly connected to the center, and the sealing cover plate 8 is fixedly connected to the four sides by positioning posts 16. The positioning posts 16 are slidably inserted into the positioning grooves 17 opened on the upper surface of the upright plate 5. A rainwater sensor 18 is fixedly installed on the top of the sealing cover plate 8. By inserting the positioning posts 16 into the positioning grooves 17, the sealing cover plate 8 can be quickly positioned and covered on the top of the four splicing plates 6 to seal the top of the splicing plates 6. At the same time, while the sealing cover plate 8 is covering, the pressure post 15 fixedly connected to the center of its lower surface presses against the top of the inner filter cylinder 4, thereby pressing and fixing the inner filter cylinder 4, further improving its stability and sealing performance. At the same time, when the inner filter cylinder 4 needs to be disassembled and cleaned in the future, the inner filter cylinder 4 can also be quickly removed by removing the sealing cover plate 8, which is convenient and reduces the difficulty of maintenance.

[0023] A limiting post 19 is fixedly connected to the lower surface of the positioning plate 7. A limiting groove 20 is opened on the upper surface of the air conditioning unit body 1 at the corresponding position of the limiting post 19. The limiting groove 20 and the limiting post 19 are slidably inserted into each other. The limiting post 19 is positioned by the limiting groove 20, so that the positioning plate 7 can be accurately slidably installed on one side of the upright plate 5, which facilitates the quick positioning and installation of the splicing plate 6. The fixing component includes a support plate 21. Four support plates 21 are provided and arranged in a rectangle about the upper surface of the air conditioning unit body 1. The bottom end of the support plate 21 is fixedly connected to the upper surface of the air conditioning unit body 1. A through hole 22 is opened on one side of the top end of the support plate 21, and a groove 23 is opened on the other side of the top end of the support plate 21. A fixing seat 24 is provided on the upper side of the through hole 22. The fixing seat 24 is rotatably connected to the middle of the hook plate 25 through a first limiting pin. The fixing seat 24 limits the hook plate 25. A limiting hole 26 is opened at the bottom end of the hook plate 25. A limiting block 27 is provided on one side of the bottom of the hook plate 25. The limiting block 27 is fixedly installed on the support plate 21. An adjusting column 28 is threadedly connected to one side of the limiting block 27. The adjusting column 28 is slidably inserted into the limiting hole 26. The size of the limiting hole 26 is the same as the diameter of one end of the adjusting column 28. The top of the hook plate 25 is rotatably connected to one end of the connecting plate 29 through a second limiting pin. The other end of the connecting plate 29 is rotatably connected to the middle of the adjusting block 30 through a third limiting pin. The adjusting block 30 is slidably connected to the slide rail fixedly connected to the top of the support plate 21 through a slider fixedly installed at its bottom. The movement of the adjusting block 30 is facilitated by the cooperation of the slide rail and the slider. Pressure rods 31 are fixedly connected to the top and bottom sides of the adjusting block 30. Several pressure blocks 32 are fixedly connected to one side of the pressure rods 31. The pressure blocks 32 are pressed and fitted with the positioning plate 7. One side of the pressure block 32 is V-shaped, which facilitates fitting with the outer contour of the two positioning plates 7 after splicing.

[0024] After the inner filter cartridge 4 is installed, the positioning plate 7 can be slidably installed on one side of the upright plate 5 through the cooperation of the limiting post 19 and the limiting groove 20. Thus, the splicing plate 6 can be limited around the inner filter cartridge 4 through the positioning plate 7, thereby initially limiting and fixing the outer filter plate 9. Then, by pulling the bottom of the hook plate 25 away from the positioning plate 7, the hook plate 25 rotates towards the positioning plate 7 through the rotational connection between its middle part and the fixed seat 24. Under the rotational connection of the connecting plate 29, the connecting plate 29 pushes the adjusting block 30 to move. The adjusting block 30 moves towards the positioning plate 7 with the cooperation of the slide rail and the slider. Then, the adjusting block 30 drives the pressure rod 3. 1. The movement is synchronized until the pressure rod 31 drives the pressure block 32 to press tightly against the outer wall of the positioning plate 7. At this time, the limiting hole 26 is coaxial with the adjusting column 28. Then, by twisting the adjusting column 28, it passes through the bottom of the hook plate 25 and is screwed into the limiting block 27, thereby limiting and fixing the hook plate 25, and indirectly limiting several pressure blocks 32, so that the pressure blocks 32 are stably pressed against the outer wall of the positioning plate 7, thus fixing the outer filter plate 9. When it is necessary to disassemble and clean the outer filter plate 9, the limiting block 27 is twisted out of the adjusting column 28, and the hook plate 25 is pulled in the opposite direction to quickly release the limiting of the outer filter plate 9, so that it can be quickly disassembled and cleaned. The operation is convenient, reduces the operation difficulty, and improves the maintenance efficiency.

[0025] The folding assembly includes a fixed plate 33. One side of the fixed plate 33 is fixedly connected to the splicing plate 6, and the other side of the fixed plate 33 is rotatably connected to one end of the first connecting rod 34 and the second connecting rod 35 via fixing pins. The other ends of the first connecting rod 34 and the second connecting rod 35 are both fixedly connected to one side of the moving plate 36 via connecting pins. The other side of the moving plate 36 is fixedly connected to the guide plate 10. Through the cooperation between the first connecting rod 34 and the second connecting rod 35 and the fixed plate 33 and the moving plate 36, it is easy for the moving plate 36 to connect with the fixed plate 6. The fixed plates 33 can move relative to each other. Several guide grooves 37 are opened on one side of the guide plate 10. The opening of the guide grooves 37 facilitates the guidance of rainwater. A stop bar 38 is fixedly installed on the side of the fixed plate 33 near the top of the first connecting rod 34. The stop bar 38 limits the first connecting rod 34. A lower locking pin 39 is fixedly installed on the side of the fixed plate 33 near the bottom of the second connecting rod 35. An upper locking pin 40 is fixedly installed on the side of the moving plate 36 near the top of the second connecting rod 35. The lower locking pin 39 and the upper locking pin 40 are fixedly connected by a tension spring 41.

[0026] Rain sensor 18 is electrically connected to an external alarm device. When rainy weather occurs, rain sensor 18 transmits rain information to the alarm device, thereby reminding the operator to perform rain protection operations on the top of the air conditioning unit body 1. This prevents a large amount of rainwater from entering the air conditioning unit body 1 through the outer filter plate 9 and the inner filter cartridge 4. The operator pulls the moving plate 36 diagonally upwards. With the rotational connection of the first link 34 and the second link 35, the moving plate 36 flips upwards, and the tension spring 41 is stretched until the moving plate 36 rotates to the horizontal turntable near the guide plate 10, so that the moving plate 36... 6 drives the guide plate 10 to a horizontal position. At this time, one side of the guide plate 10 is tightly attached to the top side of the splicing plate 6. Under the reverse tension of the tension spring 41, the first link 34 and the second link 35 are in a stable state, thereby causing the guide plate 10 to unfold. Then, it works with the guide groove 37 opened on it to guide the flow, thereby reducing the water seepage into the air conditioning unit body 1. When it is not raining, by folding the moving plate 36 back, under the rotation cooperation of the first link 34 and the second link 35, the moving plate 36 drives the guide plate 10 to return to its original position. At this time, the guide plate 10 can be used to shade the fan 2 from direct sunlight.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatically adjustable multi-functional low-temperature grain storage air conditioning unit, comprising an air conditioning unit body (1) and a fan (2) fixedly installed on the top of the air conditioning unit body (1), characterized in that: The top of the fan (2) is covered with a cover (3), and the outer side of the cover (3) is covered with an inner filter (4). The inner filter (4) is detachably connected to the upper surface of the air conditioning unit body (1). The inner filter cartridge (4) is surrounded by upright plates (5). The lower surface of each upright plate (5) is fixedly connected to the upper surface of the air conditioning unit body (1). A splicing plate (6) is provided between every two upright plates (5). A positioning plate (7) is fixedly connected to both sides of each splicing plate (6). One side of the positioning plate (7) is slidably attached to the upright plate (5). The other side of the positioning plate (7) is provided with a fixing component for pressing the positioning plate (7) against one side of the upright plate (5). A sealing cover plate (8) is detachably installed on the upper surface of the splicing block (6). An external filter plate (9) is fixedly installed at the bottom of the positioning plate (7). A guide plate (10) is provided on one side of the top of the external filter plate (9). One side of the guide plate (10) can be folded and connected to the top side of the splicing plate (6) through a folding assembly.

2. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 1, characterized in that: The air conditioning unit body (1) is fixedly installed in the concrete base (11) at the bottom. Air ducts (12) are fixedly fitted on both sides of the air conditioning unit body (1). An annular groove (13) is opened at the center of the upper surface of the air conditioning unit body (1). The annular groove (13) and the sealing ring (14) fixedly connected to the lower surface of the inner filter (4) are slidably inserted.

3. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 2, characterized in that: The upper surface of the inner filter cylinder (4) abuts against the bottom end of the pressure column (15), the upper surface of the pressure column (15) is fixedly connected to the center of the sealing cover plate (8), the sealing cover plate (8) is fixedly connected around the perimeter with positioning columns (16), the positioning columns (16) are slidably inserted into the positioning groove (17) opened on the upper surface of the upright plate (5), and a rainwater sensor (18) is fixedly installed on the top of the sealing cover plate (8).

4. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 1, characterized in that: The lower surface of the positioning plate (7) is fixedly connected to a limiting post (19). A limiting groove (20) is opened on the upper surface of the air conditioning unit body (1) at the corresponding position of the limiting post (19). The limiting groove (20) and the limiting post (19) are slidably inserted together. The fixing component includes a support plate (21). The bottom end of the support plate (21) is fixedly connected to the upper surface of the air conditioning unit body (1).

5. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 4, characterized in that: The support plate (21) has a through hole (22) on one side of its top end and a groove (23) on the other side of its top end. A fixing seat (24) is provided on the upper side of the through hole (22). The fixing seat (24) is rotatably connected to the middle of the hook plate (25) through a first limiting pin. A limiting hole (26) is provided at the bottom end of the hook plate (25). A limiting block (27) is provided on one side of the bottom of the hook plate (25). The limiting block (27) is fixedly installed on the support plate (21). An adjusting column (28) is threadedly connected to one side of the limiting block (27). The adjusting column (28) and the limiting hole (26) are slidably inserted into each other.

6. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 5, characterized in that: The top of the hook plate (25) is rotatably connected to one end of the connecting plate (29) via a second limiting pin, and the other end of the connecting plate (29) is rotatably connected to the middle of the adjusting block (30) via a third limiting pin. The adjusting block (30) is slidably connected to the slide rail fixedly connected to the top of the support plate (21) via a slider fixedly installed at its bottom.

7. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 6, characterized in that: The top and bottom sides of the adjusting block (30) are fixedly connected with pressure rods (31), and several pressure blocks (32) are fixedly connected to one side of the pressure rods (31). The pressure blocks (32) are pressed together with the positioning plate (7).

8. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 1, characterized in that: The folding assembly includes a fixing plate (33), one side of which is fixedly connected to the splicing plate (6), and the other side of which is rotatably connected to one end of the first connecting rod (34) and the second connecting rod (35) through fixing pins. The other ends of the first connecting rod (34) and the second connecting rod (35) are fixedly connected to one side of the moving plate (36) through connecting pins. The other side of the moving plate (36) is fixedly connected to the guide plate (10).

9. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 8, characterized in that: The guide plate (10) has several guide grooves (37) on one side. A stop bar (38) is fixedly installed on the side of the fixed plate (33) near the top of the first connecting rod (34). A lower locking pin (39) is fixedly installed on the side of the fixed plate (33) near the bottom of the second connecting rod (35).

10. The automatically adjustable multi-functional low-temperature grain storage air conditioning unit according to claim 9, characterized in that: The movable plate (36) is fixedly installed with an upper locking pin (40) on the side near the top of the second connecting rod (35), and the lower locking pin (39) is fixedly connected to the upper locking pin (40) by a tension spring (41).

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