Double-groove pipe air tightness testing device for squat silo

Abstract

The utility model relates to the related technical field of granaries, in particular to a double-groove pipe air tightness testing device for a squat silo, which comprises a water tank; a lifting plate is arranged in the water tank, a positioning box is arranged on one side of the top of the lifting plate, and two double-groove pipe bodies are arranged in the positioning box. Under the matching action of the water tank, the lifting plate, the positioning box, the double-groove pipe body, the fixing plate, the supporting frame, the telescopic mechanism and the conveying mechanism, the double-groove pipe body can be placed in water after the two ends of the double-groove pipe body are sealed, meanwhile, the double-groove pipe body is inflated, a user can observe whether bubbles exist in the water or not, and the user can conveniently use the double-groove pipe body. According to the double-groove pipe air tightness detection device for the squat silo, the problems that when a small amount of air leaks from the double-groove pipe, the volume change of the balloon is relatively weak, so that a worker cannot observe the volume change of the balloon with naked eyes, and the use is relatively inconvenient are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of grain bins, in particular to an airtightness inspection device for a double-groove pipe of a shallow silo. Background Technique

[0002] A shallow silo, also known as a short silo, is a cylindrical above-ground grain bin with a ratio of the silo height to the diameter less than 1.5, mostly a flat-bottom silo, which can be used as a grain bin to store grains. The main body of the silo wall is mostly made of reinforced concrete structure. With the continuous progress of society, in order to ensure the normal storage of grains, the application of double-groove pipes is increasing. However, some double-groove pipes cannot ensure good airtightness during use, which will affect the storage of grains. Therefore, the demand for an airtightness inspection device for a double-groove pipe of a grain bin is growing.

[0003] The utility model patent with the publication number of CN220490297U discloses an airtightness inspection device for a double-groove pipe of a shallow silo, belonging to the technical field of grain bins, aiming to solve the problem that in the prior art, the airtightness of the double-groove pipe cannot be accurately detected by a detection device before use. Once the airtightness of the double-groove pipe is poor, it will affect the normal storage of grains. Although there are some detection methods for the airtightness of double-groove pipes at present, some detection methods are not convenient for detecting the airtightness of double-groove pipes with different lengths, thus greatly reducing the application range of the device. The device includes a support frame, on the top surface of the support frame, an airtight box and a mounting plate are arranged left and right. A trachea is arranged on one side surface of the airtight box, and a balloon is sleeved on the trachea. An insertion port is opened on the side wall of the airtight box close to the mounting plate. The double-groove pipe to be detected is installed between the airtight box and the mounting plate, so that the double-groove pipe to be detected, the balloon, the airtight box and the mounting plate jointly form a sealed space. After injecting gas through an air pump to inflate the balloon, after stopping injecting gas, observing the volume change of the balloon can simply and intuitively detect the airtightness of the double-groove pipe to be detected. The structure is simple and the operation is convenient. At the same time, the mounting plate can drive the mounting plate to move towards the side close to or away from the airtight box through the arranged driving mechanism, which is suitable for installing and detecting double-groove pipes to be detected with different lengths, and increases the application range of the device.

[0004] However, the above patent still has deficiencies: the patent detects the airtightness of the double-groove pipe by observing the volume change of the balloon. However, when there is a small amount of air leakage in the double-groove pipe, the volume change of the balloon is relatively weak, resulting in that the staff cannot observe the volume change of the balloon with the naked eye, and it is relatively inconvenient to use. Content of the Utility Model

[0005] To make up for the above deficiencies, the present utility model provides an airtightness inspection device for double-groove pipes in a shallow silo to solve the problem that when a small amount of air leakage occurs in the existing double-groove pipes in a shallow silo, the volume change of the balloon is relatively weak, resulting in the inability of the staff to observe the volume change of the balloon with the naked eye and making it inconvenient to use as described in the above background art.

[0006] The technical solution of the present utility model is as follows:

[0007] An airtightness inspection device for double-groove pipes in a shallow silo, comprising: a water tank; a lifting plate is arranged inside the water tank, a positioning box is arranged on one side of the top of the lifting plate, two double-groove pipe bodies are arranged inside the positioning box, a fixing plate is fixedly connected to the side of the lifting plate away from the positioning box, a support frame is fixedly connected to the lifting plate near the positioning box, and the support frame is fixedly connected to the lifting plate; a telescopic mechanism for sealing both ends of the double-groove pipe body is arranged on the side of the fixing plate close to the double-groove pipe body; a rotating mechanism for centering the double-groove pipe body is arranged inside the positioning box; and a conveying mechanism for inflating the inside of the double-groove pipe body is arranged on the top of the support frame.

[0008] Preferably, the telescopic mechanism includes: a moving plate is arranged on the side of the fixing plate close to the double-groove pipe body, two hydraulic cylinders are arranged on the side of the moving plate close to the fixing plate, the hydraulic cylinders are all fixed inside the fixing plate, the moving plate is fixedly connected to the telescopic ends of the hydraulic cylinders, extrusion plates are fixedly connected to the side of the moving plate close to the double-groove pipe body, and first sealing gaskets are fixedly connected to the side of the extrusion plates close to the double-groove pipe body; a sealing plate is arranged at the end of the double-groove pipe body away from the moving plate, the sealing plate is fixedly connected to the positioning box, second sealing gaskets are fixedly connected to the side of the sealing plate close to the double-groove pipe body, and the second sealing gaskets cooperate with the first sealing gaskets.

[0009] Preferably, the rotating mechanism includes: four sliders are slidably connected to the positioning box near the double-groove pipe body, a positioning claw is fixedly connected to one side of each slider, a roller is arranged inside each positioning claw, a rotating shaft is rotatably connected to the center of each roller, and both ends of the rotating shaft are fixedly connected to the positioning claw; two flat spiral disks are rotatably connected inside the positioning box, the sliders are respectively engaged with the flat spiral disks, a hollow tube is fixedly connected to the side of the flat spiral disk away from the slider, a worm gear is fixedly connected to the end of the hollow tube away from the flat spiral disk, a worm is arranged between the two worm gears, the bottom end of the worm is rotatably connected to the positioning box, the top end of the worm penetrates the positioning box and extends to the motor, and the motor is fixedly connected to the positioning box, and the worm is fixedly connected to the output end of the motor.

[0010] Preferably, the conveying mechanism includes: an air pump is fixedly connected to the top of the support frame, the output end of the air pump is fixedly connected to a three-way pipe, and both ends of the three-way pipe away from the air pump are fixedly connected to the sealing plate; two spray heads are fixedly connected to the sealing plate near the double-groove pipe body, and the three-way pipe is communicated with the spray heads.

[0011] Preferably, a gantry is fixedly connected to the top of the water tank, a double-shaft motor is fixedly connected to the top of the gantry, first bevel gears are fixedly connected to both output ends of the double-shaft motor, second bevel gears are meshed with one side of both first bevel gears away from the double-shaft motor, a screw rod is fixedly connected to the center of each second bevel gear, the bottom ends of the screw rods penetrate through the gantry and the lifting plate and extend to the water tank, the screw rods are rotationally connected to the gantry and the water tank, and the lifting plate is threadedly connected to the screw rods.

[0012] Preferably, a drain port is provided on one side of the water tank, and a valve is arranged inside the drain port.

[0013] Preferably, universal wheels with braking functions are arranged at the four corners of the bottom of the water tank, and the universal wheels are fixedly connected to the water tank.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] First, through the combined action of the water tank, the lifting plate, the positioning box, the double-groove pipe body, the fixing plate, the support frame, the telescopic mechanism and the conveying mechanism, the two ends of the double-groove pipe body can be sealed and then placed in water, and at the same time, air is inflated into the double-groove pipe body. The user can observe whether there are bubbles in the water to judge the airtightness of the double-groove pipe body, solving the problem that when the double-groove pipe of the existing shallow silo has a small amount of air leakage, the volume change of the balloon is relatively weak, resulting in the staff being unable to observe the volume change of the balloon with the naked eye and the use being inconvenient.

[0016] Second, through the combined action of the water tank, the lifting plate, the positioning box, the double-groove pipe body, the fixing plate, the support frame and the rotating mechanism, not only can the center positioning of the double-groove pipe body be carried out to keep the double-groove pipe body in a horizontal state, so as to facilitate the sealing of both ends of the double-groove pipe body by the device and improve the sealing effect of both ends of the double-groove pipe body, but also the function of sealing double-groove pipe bodies with different diameters can be realized, improving the scope of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of a double-groove pipe airtightness inspection device for a shallow silo of the present utility model;

[0018] Figure 2 For the present utility model Figure 1 The enlarged structural schematic diagram of part A in

[0019] Figure 3 The side view and sectional view structural schematic diagram of a double - groove pipe airtightness inspection device for a shallow silo of the present utility model;

[0020] Figure 4 The structural schematic diagram of the rotating mechanism of the present utility model;

[0021] Figure 5 For the present utility model Figure 4 The enlarged structural schematic diagram of part B in

[0022] Figure 6 The structural schematic diagram of the telescopic mechanism of the present utility model;

[0023] Figure 7 The structural schematic diagram of the conveying mechanism of the present utility model;

[0024] Figure 8 The structural schematic diagram of the connection between the lifting plate and the screw of the present utility model.

[0025] In the figure:

[0026] 1. Water tank; 2. Lifting plate; 3. Positioning box; 4. Double - groove pipe body; 5. Fixed plate; 6. Support frame; 7. Telescopic mechanism; 8. Rotating mechanism; 9. Conveying mechanism; 10. Moving plate; 11. Hydraulic cylinder; 12. Extrusion plate; 13. First sealing gasket; 14. Sealing plate; 15. Second sealing gasket; 16. Slide block; 17. Positioning claw; 18. Roller; 19. Rotating shaft; 20. Flat screw plate; 21. Hollow pipe; 22. Worm gear; 23. Worm; 24. Motor; 25. Universal wheel; 26. Air pump; 27. Three - way pipe; 28. Sprayer; 29. Gantry; 30. Biaxial motor; 31. First bevel gear; 32. Second bevel gear; 33. Screw; 34. Drainage port; 35. Valve. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1 to 8 , the present utility model details the above - mentioned technical solutions through the following embodiments:

[0029] An airtightness inspection device for double-groove pipes used in shallow silos, comprising: a water tank 1; a lifting plate 2 is arranged inside the water tank 1, a positioning box 3 is arranged on one side of the top of the lifting plate 2, two double-groove pipe bodies 4 are arranged inside the positioning box 3, a fixing plate 5 is fixedly connected to the side of the lifting plate 2 away from the positioning box 3, a support frame 6 is fixedly connected to the lifting plate 2 near the positioning box 3, and the support frame 6 is fixedly connected to the lifting plate 2; a telescopic mechanism 7 for sealing the two ends of the double-groove pipe body 4 is arranged on the side of the fixing plate 5 close to the double-groove pipe body 4; a rotating mechanism 8 for centering the double-groove pipe body 4 is arranged inside the positioning box 3; a conveying mechanism 9 for inflating the inside of the double-groove pipe body 4 is arranged on the top of the support frame 6. The center of the double-groove pipe body 4 can be positioned by the positioning and rotating mechanism 8, and then the two ends of the double-groove pipe body 4 are sealed by the telescopic mechanism 7 and placed in water, and the inside of the double-groove pipe body 4 is inflated simultaneously by the conveying mechanism 9. The user can observe whether there are bubbles in the water to judge the airtightness of the double-groove pipe body 4, solving the problem that when there is a small amount of air leakage in the double-groove pipe of the existing shallow silo airtightness inspection device, the volume change of the balloon is relatively weak, resulting in the staff being unable to observe the volume change of the balloon with the naked eye and the use being inconvenient.

[0030] As Figure 6 and Figure 7 As shown in and, the telescopic mechanism 7 includes: a moving plate 10 is arranged on the side of the fixing plate 5 close to the double-groove pipe body 4, two hydraulic cylinders 11 are arranged on the side of the moving plate 10 close to the fixing plate 5, the hydraulic cylinders 11 are fixed inside the fixing plate 5, the moving plate 10 is fixedly connected to the telescopic ends of the hydraulic cylinders 11, extrusion plates 12 are fixedly connected to the moving plate 10 near the double-groove pipe body 4, and first sealing gaskets 13 are fixedly connected to the sides of the extrusion plates 12 close to the double-groove pipe body 4; a sealing plate 14 is arranged at one end of the double-groove pipe body 4 away from the moving plate 10, the sealing plate 14 is fixedly connected to the positioning box 3, second sealing gaskets 15 are fixedly connected to the sides of the sealing plate 14 close to the double-groove pipe body 4, and the second sealing gaskets 15 cooperate with the first sealing gaskets 13. When the hydraulic cylinders 11 are started, the telescopic ends of the hydraulic cylinders 11 drive the moving plate 10 to move towards the double-groove pipe body 4. While the moving plate 10 moves, it drives the sealing plate 14, the sealing plate 14 drives the first sealing gasket 13, and at the same time pushes the double-groove pipe body 4, so that the other end of the double-groove pipe body 4 contacts the second sealing gasket 15, and the two ends of the double-groove pipe body 4 are sealed through the cooperation of the first sealing gasket 13 and the second sealing gasket 15.

[0031] As Figure 2 and Figure 4As shown in the figure, the rotating mechanism 8 includes: Four sliders 16 are slidably connected to the positioning box 3 near the double-groove pipe body 4. A positioning claw 17 is fixedly connected to one side of each slider 16. A roller 18 is arranged inside each positioning claw 17. A rotating shaft 19 is rotatably connected to the center of each roller 18. Both ends of the rotating shaft 19 are fixedly connected to the positioning claw 17. Two flat spiral disks 20 are rotatably connected to the inside of the positioning box 3. The sliders 16 are respectively engaged with the flat spiral disks 20. A hollow pipe 21 is fixedly connected to the side of the flat spiral disk 20 away from the slider 16. A worm gear 22 is fixedly connected to the end of the hollow pipe 21 away from the flat spiral disk 20. A worm 23 is arranged between the two worm gears 22. The bottom end of the worm 23 is rotatably connected to the positioning box 3. The top end of the worm 23 penetrates through the positioning box 3 and extends to the motor 24. The motor 24 is fixedly connected to the positioning box 3. The worm 23 is fixedly connected to the output end of the motor 24. Start the motor 24. The output end of the motor 24 drives the worm 23. The worm 23 drives the two worm gears 22 on both sides to rotate synchronously and in opposite directions. While the worm gears 22 are rotating, they drive the hollow pipes 21. The hollow pipes 21 respectively drive the flat spiral disks 20. While the flat spiral disks 20 are rotating, they push the sliders 16 through the flat threads on their surfaces. The sliders 16 move towards the double-groove pipe body 4 through the cooperation of the positioning box 3. While the sliders 16 are moving, they drive the positioning claws 17. The positioning claws 17 drive the rollers 18 through the rotating shafts 19, so that the rollers 18 contact the surface of the double-groove pipe body 4, thereby achieving the purpose of centering the double-groove pipe body 4.

[0032] As Figure 7 shown in the figure, the conveying mechanism 9 includes: An air pump 26 is fixedly connected to the top of the support frame 6. The output end of the air pump 26 is fixedly connected to a three-way pipe 27. Both ends of the three-way pipe 27 away from the air pump 26 are fixedly connected to the sealing plate 14. Two spray heads 28 are fixedly connected to the sealing plate 14 near the double-groove pipe body 4. The three-way pipe 27 is communicated with the spray heads 28. Start the air pump 26. The air pump 26 extracts the air from the outside through the input port, and then conveys it to the inside of the three-way pipe 27 through the output end. The air is conveyed to the inside of the double-groove pipe body 4 by the spray heads 28 after passing through the three-way pipe 27 and the sealing plate 14.

[0033] As Figure 3 and Figure 8As shown in the figure, a gantry 29 is fixedly connected to the top of the water tank 1. A dual-shaft motor 30 is fixedly connected to the top of the gantry 29. Both output ends of the dual-shaft motor 30 are fixedly connected with first bevel gears 31. A second bevel gear 32 is meshed with each side of the two first bevel gears 31 away from the dual-shaft motor 30. A screw rod 33 is fixedly connected to the center of each second bevel gear 32. The bottom ends of the screw rods 33 penetrate through the gantry 29 and the lifting plate 2 and extend to the water tank 1. The screw rods 33 are rotationally connected with the gantry 29 and the water tank 1. The lifting plate 2 is in threaded connection with the screw rods 33. Start the dual-shaft motor 30. The output end of the dual-shaft motor 30 drives the first bevel gear 31. The first bevel gear 31 drives the second bevel gear 32. The second bevel gear 32 drives the screw rod 33 to rotate. While the screw rod 33 rotates, it drives the lifting plate 2, causing the lifting plate 2 to descend vertically, and then immersing the double-groove pipe body 4 into the water tank 1.

[0034] As Figure 1 and Figure 3 shown in the figure, a drain port 34 is provided on one side of the water tank 1. A valve 35 is arranged inside the drain port 34, which facilitates the user to drain the water inside the water tank 1.

[0035] As Figure 1 shown in the figure, universal wheels 25 with braking functions are arranged at the four corners of the bottom of the water tank 1. The universal wheels 25 are fixedly connected with the water tank 1, which facilitates the user to move and fix the device.

[0036] Working principle: The user places the double-groove pipe body 4 inside the positioning box 3, and then starts the motor 24. The output end of the motor 24 drives the worm 23. The worm 23 drives the two worm wheels 22 on both sides to rotate synchronously and reversely. While the worm wheels 22 rotate, they drive the hollow pipes 21. The hollow pipes 21 respectively drive the flat screw disks 20. While the flat screw disks 20 rotate, they push the sliders 16 through the flat threads on their surfaces. The sliders 16 move towards the double-groove pipe body 4 through the cooperation of the positioning box 3. While the sliders 16 move, they drive the positioning claws 17. The positioning claws 17 drive the rollers 18 through the rotating shafts 19, so that the rollers 18 contact the surface of the double-groove pipe body 4, thereby achieving the purpose of central positioning of the double-groove pipe body 4. Then start the hydraulic cylinder 11. The telescopic end of the hydraulic cylinder 11 drives the moving plate 10 to move towards the double-groove pipe body 4. While the moving plate 10 moves, it drives the sealing plate 14. The sealing plate 14 drives the first sealing gasket 13 and simultaneously pushes the double-groove pipe body 4, so that the other end of the double-groove pipe body 4 contacts the second sealing gasket 15. The two ends of the double-groove pipe body 4 are sealed through the cooperation of the first sealing gasket 13 and the second sealing gasket 15.

[0037] After the two ends of the double-groove pipe body 4 are sealed, the double-shaft motor 30 is started. The output end of the double-shaft motor 30 drives the first bevel gear 31, the first bevel gear 31 drives the second bevel gear 32, and the second bevel gear 32 drives the screw 33 to rotate. While the screw 33 rotates, it drives the lifting plate 2, causing the lifting plate 2 to descend vertically, thereby immersing the double-groove pipe body 4 into the water tank 1. Finally, the air pump 26 is started. The air pump 26 extracts the air from the outside through the input port and then transports it to the inside of the three-way pipe 27 through the output end. The air is transported to the inside of the double-groove pipe body 4 by the nozzle 28 after passing through the three-way pipe 27 and the sealing plate 14. The user can observe whether there are bubbles in the water to judge the airtightness of the double-groove pipe body 4, solving the problem that when there is a small amount of air leakage in the double-groove pipe of the existing shallow silo, the volume change of the balloon is relatively weak, resulting in the inability of the staff to observe the volume change of the balloon with the naked eye, which is inconvenient to use.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-grooved pipe air tightness test device for a shallow silo, comprising: Water tank (1); The invention is characterized in that a lifting plate (2) is arranged inside the water tank (1), a positioning box (3) is arranged on one side of the top of the lifting plate (2), two double-grooved pipe bodies (4) are arranged inside the positioning box (3), a fixing plate (5) is fixedly connected to the side of the lifting plate (2) away from the positioning box (3), a support frame (6) is fixedly connected to the lifting plate (2) near the positioning box (3), and the support frame (6) is fixedly connected to the lifting plate (2); A telescopic mechanism (7) for sealing both ends of the double-grooved tube body (4) is provided on one side of the fixing plate (5) close to the double-grooved tube body (4); The interior of the positioning box (3) is provided with a rotating mechanism (8) for center positioning the double-grooved tube body (4); The top of the support frame (6) is provided with a conveying mechanism (9) for inflating the interior of the double-grooved tube body (4).

2. A double-grooved tube air tightness test device for a shallow silo as claimed in claim 1, characterized in that: The telescopic mechanism (7) comprises: A movable plate (10) is arranged on one side of the fixed plate (5) close to the double-grooved tube body (4); two hydraulic cylinders (11) are arranged on one side of the movable plate (10) close to the fixed plate (5); the hydraulic cylinders (11) are fixed inside the fixed plate (5); the movable plate (10) is fixedly connected to the telescopic end of the hydraulic cylinder (11); an extrusion plate (12) is fixedly connected to the movable plate (10) close to the double-grooved tube body (4); and a first sealing gasket (13) is fixedly connected to one side of the extrusion plate (12) close to the double-grooved tube body (4); A sealing plate (14) is provided at one end of the double-grooved tube body (4) away from the movable plate (10), and the sealing plate (14) is fixedly connected to the positioning box (3). A second sealing gasket (15) is fixedly connected to the sealing plate (14) near the double-grooved tube body (4), and the second sealing gasket (15) cooperates with the first sealing gasket (13).

3. The double-grooved tube air tightness test device for a shallow silo as claimed in claim 1, characterized in that: The rotating mechanism (8) comprises: The positioning box (3) is slidably connected to four sliders (16) near the double-grooved tube body (4), one side of the slider (16) is fixedly connected to a positioning claw (17), a roller (18) is arranged inside the positioning claw (17), a rotating shaft (19) is rotatably connected to the center of the roller (18), and both ends of the rotating shaft (19) are fixedly connected to the positioning claw (17); Two flat screw discs (20) are rotatably connected inside the positioning box (3), the sliders (16) are respectively meshed with the flat screw discs (20), a hollow tube (21) is fixedly connected to one side of the flat screw disc (20) away from the slider (16), a worm wheel (22) is fixedly connected to one end of the hollow tube (21) away from the flat screw disc (20), a worm (23) is arranged between the two worm wheels (22), the bottom end of the worm (23) is rotatably connected to the positioning box (3), the top end of the worm (23) passes through the positioning box (3) and extends to the motor (24), the motor (24) is fixedly connected to the positioning box (3), and the worm (23) is fixedly connected to the output end of the motor (24).

4. A double-grooved tube air tightness test device for a shallow silo as claimed in claim 2, characterized in that: The conveying mechanism (9) comprises: The top of the support frame (6) is fixedly connected to an air pump (26), the output end of the air pump (26) is fixedly connected to a three-way pipe (27), and both ends of the three-way pipe (27) away from the air pump (26) are fixedly connected to the sealing plate (14); Two spray heads (28) are fixedly connected to the sealing plate (14) near the double-grooved pipe body (4), and the three-way pipe (27) is connected to the spray heads (28).

5. The double-grooved tube air tightness test device for shallow silos according to claim 1, characterized in that: The top of the water tank (1) is fixedly connected to a gantry (29), the top of the gantry (29) is fixedly connected to a double-axis motor (30), both output ends of the double-axis motor (30) are fixedly connected to first bevel gears (31), the two first bevel gears (31) are meshed with second bevel gears (32) on the sides away from the double-axis motor (30), the center of the second bevel gears (32) is fixedly connected to a screw rod (33), the bottom end of the screw rod (33) passes through the gantry (29) and the lifting plate (2) and extends to the water tank (1), the screw rod (33) is rotatably connected to the gantry (29) and the water tank (1), and the lifting plate (2) is threadedly connected to the screw rod (33).

6. The double-grooved tube air tightness testing device for shallow silos according to claim 1, characterized in that: A drain port (34) is provided on one side of the water tank (1), and a valve (35) is provided inside the drain port (34).

7. The double-grooved tube air tightness test device for shallow silos according to claim 1, characterized in that: Universal wheels (25) with a braking function are arranged at the four corners of the bottom of the water tank (1), and the universal wheels (25) are fixedly connected to the water tank (1).

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