Pesticide applying device for circulating fumigation medicine in grain depot

Abstract

The utility model relates to the technical field of grain depot circulation fumigation, in particular to a medicine applying device for grain depot circulation fumigation medicine. Comprising a pesticide applying pipe; the device is characterized in that a grain inserting assembly is slidably connected into the pesticide applying pipe, a first limiting assembly is fixedly installed at the top of the pesticide applying pipe, an annular groove is formed in the outer side face of the pesticide applying pipe, a first positioning column and a second positioning column are fixedly connected between the inner top wall and the inner bottom wall of the annular groove, and a pesticide placing assembly is movably installed in the annular groove; a second limiting assembly is fixedly installed on the outer side face of the top end of the pesticide applying pipe, a limiting long plate and a connecting vertical plate are fixedly installed on the outer side face of the bottom end of the pesticide applying pipe, a fifth threaded groove and a sixth threaded groove are formed in one side of the connecting vertical plate, and an anti-scratching assembly is slidably installed on the outer side face of the bottom end of the pesticide applying pipe; a supporting assembly is fixedly installed on the outer side face of the bottom end of the pesticide applying pipe. The technical problems of inconvenience in use and low safety are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fumigation of grain depots, in particular to a drug application device for circulating fumigation drugs of grain depots. Background Art

[0002] Grain depot circulating fumigation refers to a fumigation technology that kills pests by circulating fumigation gas to promote the rapid and uniform distribution of the medicinal gas produced by insect repellent in the grain in the grain depot. During the grain depot circulating fumigation process, in order to allow the insect repellent to absorb moisture in the grain, produce chemical reactions, and release medicinal gas, the grain in the grain depot must be sprayed with the drug. Therefore, a drug application device for grain depot circulating fumigation drugs is needed.

[0003] However, in the prior art, it generally includes an outer tube and a cone-shaped inner tube. During the grain storage circulation fumigation process, when using it to apply pesticides to the grain in the grain storage, first, the outer tube and the cone-shaped inner tube are simultaneously inserted into the grain in the grain storage, and then the cone-shaped inner tube is pulled out, and then the pesticide is applied to the grain in the grain storage through the outer tube. Since the cone-shaped inner tube is pulled out and then the outer tube is used to apply pesticides to the grain in the grain storage, the cone-shaped inner tube and the outer tube are separated during the application, which will cause the outer tube to be damaged after the application is completed. After that, the cone head inner tube must be inserted into the outer tube, which makes it more troublesome to use and increases the difficulty of use. In the prior art, since the cone head part of the cone head inner tube protrudes from one end of the outer tube when it is not in use, and the cone head part of the cone head inner tube is not provided with a protective device, when the cone head part of the cone head inner tube is accidentally touched by people when it is not in use, the cone head part of the cone head inner tube will scratch people, which will cause harm to people and reduce its safety. Utility Model Content

[0004] The utility model provides a pesticide application device for circulating fumigation of medicines in grain depots to solve the problems of inconvenience in use and low safety in the prior art. The device is convenient to use and highly safe.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drug application device for circulating fumigation of grain depots, comprising a drug application tube; a grain insertion component is slidably connected inside the drug application tube, a first limiting component is fixedly installed on the top of the drug application tube, an annular groove is provided on the outer side surface of the drug application tube, a first positioning column and a second positioning column are respectively fixedly connected between the inner top wall and the inner bottom wall of the annular groove, a drug release component is movably installed inside the annular groove, a second limiting component is fixedly installed on the outer side surface of the top end of the drug application tube, a limiting long plate and a connecting vertical plate are respectively fixedly installed on the outer side surface of the bottom end of the drug application tube, a fifth threaded groove and a sixth threaded groove are respectively provided on one side of the connecting vertical plate, an anti-scratch component is slidably installed on the outer side surface of the bottom end of the drug application tube, and a support component is fixedly installed on the outer side surface of the bottom end of the drug application tube.

[0006] Furthermore, the grain insertion assembly includes a connecting plate, which is slidably installed inside the application tube, the bottom of the connecting plate is fixedly connected to a conical column, the top of the connecting plate is fixedly connected to a supporting square rod, the front sides of the supporting square rod are respectively provided with a first thread groove and a second thread groove, and the top of the supporting square rod is fixedly connected to a holding plate.

[0007] Furthermore, the first limiting assembly includes a limiting plate, the bottom of which is fixedly mounted on the top of the medicine application tube, the limiting plate is slidably connected to the supporting square rod, and the first screw is threadedly connected to the inner part of the ring body of the limiting plate.

[0008] Furthermore, the drug release assembly includes a cylindrical end cover, which is movably installed inside the annular groove, and the rear side of the cylindrical end cover is respectively provided with a first positioning groove and a second positioning groove, the first positioning groove is movably connected to the first positioning column, and the second positioning groove is movably connected to the second positioning column, and the outer side surface of the cylindrical end cover is respectively fixedly connected with a supporting long rod and a connecting long rod, the internal thread of the supporting long rod is connected with a fourth screw, one side of the connecting long rod is fixedly connected with a connecting cylinder, the interior of the connecting cylinder is fixedly connected with a support column, the top and bottom of the support column are both fixedly connected with the connecting column, the end of the connecting column away from the support column is fixedly connected to the limiting column, and the outer surface of the connecting column is respectively provided with a third thread groove and a fourth thread groove.

[0009] Furthermore, the second limiting assembly includes two first support rings, which are both fixedly installed on the outer side surface of the top end of the medicine application tube, a connecting square rod is fixedly connected between the two first support rings, the connecting square rod is fixedly installed on the outer side surface of the medicine application tube, a seventh thread groove is opened on the front side of the connecting square rod, the seventh thread groove is threadedly connected to the fourth screw rod, the connecting tube is rotatably installed between the two first support rings, the connecting column is rotatably installed inside the ring body of the first support ring, the limiting column is rotatably connected to the first support ring, the outer side surface of the first support ring is fixedly connected with a first support block, and the interior of the first support block and the interior of the ring body of the first support ring are threadedly connected with the second screw rod.

[0010] Furthermore, the anti-scratch component includes a protective tube, which is slidably installed on the outer side surface of the bottom end of the applicator tube, and the inner side surface of the protective tube is respectively provided with a connecting long hole and a limiting long groove, the connecting long hole is slidably connected to the connecting vertical plate, the limiting long groove is slidably connected to the limiting long plate, and the outer side surface of the protective tube is respectively fixedly connected with an inner arc plate and a second support block, and the interior of the second support block and the interior of the ring body of the protective tube are commonly threadedly connected with a third screw.

[0011] Furthermore, the support assembly includes a second support ring, which is fixedly mounted on the outer side surface of the bottom end of the application tube. The bottom of the second support ring is fixedly connected with an outer arc plate, the outer arc plate is slidably connected to the protective tube, and the inner side surface of the outer arc plate is provided with an arc-shaped long groove, which is slidably connected to the inner arc plate.

[0012] The working principle and use principle of the utility model are as follows: in the process of using the device, through the pesticide application tube, the grain insertion component, the first limit component, the medicine release component and the second limit component, in the process of circulating fumigation of the grain warehouse, the grain insertion component is prevented from being pulled out from the pesticide application tube when the device is applying pesticides to the grain in the grain warehouse, and the difficulty of using the device is avoided because the pulled-out grain insertion component needs to be reinserted into the pesticide application tube after the pesticide application is completed, and in the process of using the device, the grain insertion component can be protected when the device is not in use through the anti-scratch component and the support component, so that the grain insertion component is prevented from being scratched by people when the device is not in use, and the device is prevented from causing harm to people due to scratches by the grain insertion component.

[0013] The beneficial technical effects of the utility model are:

[0014] By arranging the pesticide application tube, the grain insertion component, the first limiting component, the medicine release component and the second limiting component, during the grain storage circulating fumigation process, the grain insertion component can be prevented from being pulled out of the pesticide application tube when the pesticide is applied to the grain in the grain storage, so that the device can avoid the difficulty of use due to the need to reinsert the pulled-out grain insertion component into the pesticide application tube after the pesticide application is completed, so that the device can be convenient to use, and by arranging the anti-scratch component and the support component, the grain insertion component can be protected when the device is not in use, so that the grain insertion component can be prevented from scratching people due to being accidentally touched when the device is not in use, so that the device can avoid causing harm to people due to scratches by the grain insertion component, so that the safety of the device is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0016] Figure 1 It is the first frontal stereoscopic schematic diagram of the utility model.

[0017] Figure 2 It is a three-dimensional schematic diagram of a cylindrical end cover of the utility model.

[0018] Figure 3 It is a three-dimensional schematic diagram of the supporting square rod of the utility model.

[0019] Figure 4 It is a three-dimensional schematic diagram of the outer arc plate of the utility model.

[0020] Figure 5 It is a second front view stereoscopic schematic diagram of the utility model.

[0021] Figure 6 It is a front cross-sectional schematic diagram of the utility model.

[0022] Figure 7 This utility model Figure 6 Enlarged schematic diagram at point A in the middle.

[0023] Figure 8 It is a side sectional schematic diagram of the utility model.

[0024] Explanation of the numbers in the figure: 1. holding plate; 2. limiting plate; 3. application tube; 4. limiting column; 5. first support ring; 6. second screw rod; 7. first support block; 8. connecting tube; 9. connecting long rod; 10. cylindrical end cover; 11. second support ring; 12. third screw rod; 13. second support block; 14. outer arc plate; 15. conical column; 16. fourth screw rod; 17. supporting long rod; 18. first screw rod; 19. protective tube; 20. supporting square rod; 21. seventh thread groove; 22. connecting Square rod; 23, first positioning column; 24, second positioning column; 25, annular groove; 26, connecting vertical plate; 27, connecting long hole; 28, inner arc plate; 29, arc long groove; 30, connecting column; 31, third thread groove; 32, first thread groove; 33, second thread groove; 34, connecting plate; 35, fifth thread groove; 36, sixth thread groove; 37, limiting long groove; 38, limiting long plate; 39, fourth thread groove; 40, supporting column; 41, first positioning groove; 42, second positioning groove. DETAILED DESCRIPTION

[0025] The following is a further description of the pesticide application device for circulating fumigation of grain depots according to the utility model in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 8As shown: a drug application device for circulating fumigation of grain depots, comprising a drug application tube 3, a connecting plate 34, a limiting plate 2, a cylindrical end cover 10 and two first support rings 5, an annular groove 25 is provided on the outer side of the drug application tube 3, a first positioning column 23 and a second positioning column 24 are respectively fixedly connected between the inner top wall and the inner bottom wall of the annular groove 25, a conical column 15 is fixedly connected to the bottom of the connecting plate 34, a supporting square rod 20 is fixedly connected to the top of the connecting plate 34, a first thread groove 32 and a second thread groove 33 are respectively provided on the front side of the supporting square rod 20, a holding plate 1 is fixedly connected to the top of the supporting square rod 20, and the inner ring body of the limiting plate 2 is fixedly connected to the inner ring body of the limiting plate 2. A first screw rod 18 is threadedly connected, and the first screw rod 18 is threadedly connected to the first thread groove 32 and the second thread groove 33 respectively. A first positioning groove 41 and a second positioning groove 42 are respectively opened on the rear side of the cylindrical end cover 10. The outer side of the cylindrical end cover 10 is respectively fixedly connected to the supporting long rod 17 and the connecting long rod 9. The inner thread of the supporting long rod 17 is connected to the fourth screw rod 16. One side of the connecting long rod 9 is fixedly connected to the connecting cylinder 8. The interior of the connecting cylinder 8 is fixedly connected to the supporting column 40. The top and bottom of the supporting column 40 are fixedly connected to the connecting column 30. The end of the connecting column 30 away from the supporting column 40 is fixedly connected to the limiting column 4. The outer surfaces of the connecting column 30 are respectively provided with a third thread groove 31 and a fourth thread groove 39, a connecting square rod 22 is fixedly connected between the two first support rings 5, a seventh thread groove 21 is provided on the front side of the connecting square rod 22, the seventh thread groove 21 is threadedly connected to the fourth screw rod 16, the outer side surface of the first support ring 5 is fixedly connected to the first support block 7, the interior of the first support block 7 and the interior of the ring body of the first support ring 5 are commonly threadedly connected with the second screw rod 6, the second screw rod 6 is threadedly connected to the third thread groove 31 and the fourth thread groove 39 respectively, the number of the second screw rod 6 is two, through the application tube 3, the grain insertion assembly, the first limit assembly, the medicine release The arrangement of the component and the second limiting component enables the drug application tube 3 to apply drugs to the grain in the grain depot, enables the grain insertion component to be inserted into the grain in the grain depot, enables the first limiting component to limit the grain insertion component, enables the drug release component to put the insect repellent into the drug application tube 3, and enables the second limiting component to limit the drug release component. In the process of circulating fumigation of the grain depot, the device can prevent the grain insertion component from being pulled out of the drug application tube 3 when applying drugs to the grain in the grain depot, and enables the device to avoid the difficulty of use caused by reinserting the pulled-out grain insertion component into the drug application tube 3 after the application of drugs is completed, so that the device can be convenient to use.

[0027] When in use, the size of the device can be changed as the height of the grain in the grain depot changes. The conical column 15 protrudes from the bottom of the drug application tube 3. The first screw 18 is threadedly connected to the first thread groove 32, the fourth screw 16 is threadedly connected to the seventh thread groove 21, the second screw 6 is threadedly connected to the third thread groove 31, and the third screw 12 is threadedly connected to the fifth thread groove 35. During the grain depot circulation fumigation process, when it is necessary to use the device to apply drugs to the grain in the grain depot, move the device so that it is placed vertically on the grain in the grain depot, press downward and rotate the device so that the device is inserted into the grain in the grain depot. When the depth of the device inserted into the grain in the grain depot is the required drug release depth, and when the cylindrical end cover 10 and the two first support rings 5 When none of them are inserted into the grain in the grain depot, the first screw rod 18 is rotated to disconnect the first screw rod 18 from the first thread groove 32 and one end of the first screw rod 18 is located inside the ring body of the limiting plate 2, the holding plate 1 is moved upward, the supporting square rod 20 slides along the limiting plate 2, the connecting plate 34 slides along the application tube 3, and the conical column 15 moves upward. When the holding plate 1 is moved upward to the maximum distance, the bottom of the conical column 15 is located above the inner top of the annular groove 25, the second thread groove 33 corresponds to the first screw rod 18, the first screw rod 18 is rotated in the opposite direction, the first screw rod 18 is threadedly connected with the second thread groove 33, the fourth screw rod 16 is rotated to disconnect the fourth screw rod 16 from the seventh thread groove 21 and one end of the fourth screw rod 16 is located at the supporting long rod 17, and simultaneously rotate the two second screw rods 6 to disconnect the second screw rod 6 from the third thread groove 31 and make one end of the second screw rod 6 located inside the barrel of the connecting barrel 8, and rotate the limiting column 4 to make the limiting column 4, the connecting column 30 and the connecting barrel 8 rotate along the first support ring 5, so that the support column 40 and the connecting long rod 9 rotate, so that the cylindrical end cover 10 is rotated out of the annular groove 25, and the supporting long rod 17 is rotated to disconnect the cylindrical end cover 10 from the second positioning column 24 and the first positioning column 23 respectively. When the fourth thread groove 39 corresponds to the second screw rod 6, the cylindrical end cover 10 is disconnected from the annular groove 25, and the limiting column 4 is stopped from rotating, and the two second screw rods 6 are rotated in the opposite direction at the same time to make the second screw rod 6 threadedly connected to the fourth thread groove 39. At this time, the annular groove 25 can be made to rotate. The annular groove 25 is opened, and the insect repellent is moved and put into the medicine application tube 3 through the annular groove 25. Under the action of the medicine application tube 3, the insect repellent slides into the grain in the grain depot along the medicine application tube 3. At this time, the device can be used to apply medicine to the grain in the grain depot. After the insect repellent slides into the grain in the grain depot along the medicine application tube 3, the two second screw rods 6 are rotated at the same time again, the second screw rod 6 is disconnected from the fourth thread groove 39, and one end of the second screw rod 6 enters the ring body of the first support ring 5, and the limiting column 4 is rotated in the opposite direction. When the first positioning column 23 enters the first positioning groove 41 and the second positioning column 24 enters the second positioning groove 42, the cylindrical end cover 10 is located in the annular groove 25, and the second screw rod 6 corresponds to the third thread groove 31.The fourth screw rod 16 corresponds to the seventh thread groove 21, and the two second screw rods 6 are rotated in the opposite direction again, so that the second screw rod 6 is threadedly connected with the third thread groove 31, and the fourth screw rod 16 is rotated in the opposite direction, so that the fourth screw rod 16 is threadedly connected with the seventh thread groove 21, so that the annular groove 25 is closed, and the device is moved upward. When the device is completely pulled out, the first screw rod 18 is rotated again, so that the first screw rod 18 is disconnected from the second thread groove 33 and one end of the first screw rod 18 is located inside the ring body of the limiting plate 2, and the holding plate 1 is moved downward. When the conical column 15 protrudes When the first screw 18 is at the bottom of the drug application tube 3, the first screw 18 corresponds to the first thread groove 32. The first screw 18 is rotated in the opposite direction again to make the first screw 18 and the first thread groove 32 threadedly connected. At this time, the device is restored to an unused state. In this process, during the grain storage circulation fumigation, the device can avoid the grain insertion component from being pulled out from the drug application tube 3 when applying drugs to the grain in the grain storage. The device can avoid the difficulty of using the pulled-out grain insertion component because it needs to be reinserted into the drug application tube 3 after the application is completed, so that the device can be convenient to use.

[0028] like Figures 1 to 8 As shown: a drug application device for circulating fumigation of grain depots, comprising a drug application tube 3, a protective tube 19 and a second support ring 11, the outer side surface of the bottom end of the drug application tube 3 is respectively fixedly installed with a limited long plate 38 and a connecting vertical plate 26, one side of the connecting vertical plate 26 is respectively provided with a fifth thread groove 35 and a sixth thread groove 36, the inner side surface of the protective tube 19 is respectively provided with a connecting long hole 27 and a limited long groove 37, the outer side surface of the protective tube 19 is respectively fixedly connected with an inner arc plate 28 and a second support block 13, the interior of the second support block 13 and the interior of the ring body of the protective tube 19 are commonly threadedly connected with a third screw 12, and the third screw 12 is respectively connected to the fifth thread groove 35 and the sixth thread groove 36. The thread groove 35 and the sixth thread groove 36 are threadedly connected, the number of the third screw rods 12 is two, the bottom of the second support ring 11 is fixedly connected with an outer arc plate 14, and the inner side surface of the outer arc plate 14 is provided with an arc-shaped long groove 29. Through the arrangement of the anti-scratch component and the support component, the grain inserting component can avoid scratching people when not in use, and the support component can support the anti-scratch component, so that the grain inserting component can be protected when the device is not in use, and the grain inserting component can avoid scratching people due to being accidentally touched by people when the device is not in use, so that the device can avoid causing harm to people due to scratches by the grain inserting component, and the safety of the device is high.

[0029] During use, after the device is used, when the device is restored to an unused state, the two third screw rods 12 are rotated at the same time, so that the third screw rod 12 is disconnected from the fifth thread groove 35, so that one end of the third screw rod 12 enters the ring body of the protective tube 19, and the protective tube 19 is moved downward, so that the protective tube 19 slides along the drug application tube 3 and the outer arc plate 14 respectively, the inner arc plate 28 slides along the arc long groove 29, the connecting long hole 27 slides along the connecting vertical plate 26, and the limiting long plate 38 slides along the limiting long groove 37, so that the third screw rod 12 and the second support block 13 are both moved downward. When the protective tube 19 moves downward to the maximum distance, The third screw rod 12 and the sixth thread groove 36 correspond to each other, the tapered column 15 is located inside the protective tube 19, and the bottom of the tapered column 15 is located above the inner bottom of the protective tube 19. At the same time, the two third screw rods 12 are rotated in opposite directions to thread the third screw rods 12 and the sixth thread groove 36. At this time, the tapered column 15 can be prevented from scratching people when the device is not in use. In this process, the grain insertion component can be protected when the device is not in use, so that the grain insertion component can be protected from scratching people due to being accidentally touched by people when the device is not in use, so that the device can avoid causing harm to people due to scratches by the grain insertion component, and the safety of the device is high.

[0030] In this embodiment, the cylindrical end cover 10 is a half cylinder, the annular groove 25 is a half annular circular groove, the first support ring 5 is located above the second support ring 11, the first positioning column 23 and the second positioning column 24 are both quarter cylinders, and the first positioning groove 41 and the second positioning groove 42 are both half circular grooves.

Claims

1. A drug application device for circulating fumigation of grain depots, comprising a drug application pipe (3); characterized in that The inside of the medicine application tube (3) is slidably connected with a grain insertion component, the top of the medicine application tube (3) is fixedly installed with a first limit component, the outer side surface of the medicine application tube (3) is provided with an annular groove (25), the inner top wall and the inner bottom wall of the annular groove (25) are respectively fixedly connected with a first positioning column (23) and a second positioning column (24), the inside of the annular groove (25) is movably installed with a medicine release component, the top outer side surface of the medicine application tube (3) is fixedly installed with a second limit component, the bottom outer side surface of the medicine application tube (3) is respectively fixedly installed with a limit long plate (38) and a connecting vertical plate (26), one side of the connecting vertical plate (26) is respectively provided with a fifth thread groove (35) and a sixth thread groove (36), the bottom outer side surface of the medicine application tube (3) is slidably installed with an anti-scratch component, and the bottom outer side surface of the medicine application tube (3) is fixedly installed with a support component.

2. A pesticide application device for circulating fumigation of grain depots according to claim 1, characterized in that: The grain insertion assembly comprises a connecting plate (34), the connecting plate (34) being slidably mounted inside the pesticide application tube (3), the bottom of the connecting plate (34) being fixedly connected to a conical column (15), the top of the connecting plate (34) being fixedly connected to a supporting square rod (20), the front side of the supporting square rod (20) being respectively provided with a first thread groove (32) and a second thread groove (33), and the top of the supporting square rod (20) being fixedly connected to a holding plate (1).

3. A pesticide application device for circulating fumigation of grain depots according to claim 1 or 2, characterized in that: The first limiting assembly comprises a limiting plate (2), the bottom of the limiting plate (2) is fixedly mounted on the top of the drug application tube (3), the limiting plate (2) is slidably connected to the supporting square rod (20), and the first screw rod (18) is threadedly connected inside the ring body of the limiting plate (2).

4. A pesticide application device for circulating fumigation of grain depots according to claim 1 or 2, characterized in that: The drug dispensing assembly comprises a cylindrical end cover (10), the cylindrical end cover (10) being movably mounted inside the annular groove (25), a first positioning groove (41) and a second positioning groove (42) being respectively provided on the rear side of the cylindrical end cover (10), the first positioning groove (41) being movably connected to the first positioning column (23), the second positioning groove (42) being movably connected to the second positioning column (24), the outer side surface of the cylindrical end cover (10) being respectively fixedly connected to a supporting long rod (17) and a connecting long rod (9), the inner part of the supporting long rod (17) being threadedly connected to a fourth screw rod (16), one side of the connecting long rod (9) being fixedly connected to a connecting cylinder (8), the inner part of the connecting cylinder (8) being fixedly connected to a supporting column (40), the top and bottom of the supporting column (40) being fixedly connected to a connecting column (30), one end of the connecting column (30) away from the supporting column (40) being fixedly connected to a limiting column (4), and the outer surface of the connecting column (30) being respectively provided with a third thread groove (31) and a fourth thread groove (39).

5. The pesticide application device for circulating fumigation of grain depots according to claim 3 is characterized in that: The drug dispensing assembly comprises a cylindrical end cover (10), the cylindrical end cover (10) being movably mounted inside the annular groove (25), a first positioning groove (41) and a second positioning groove (42) being respectively provided on the rear side of the cylindrical end cover (10), the first positioning groove (41) being movably connected to the first positioning column (23), the second positioning groove (42) being movably connected to the second positioning column (24), the outer side surface of the cylindrical end cover (10) being respectively fixedly connected to a supporting long rod (17) and a connecting long rod (9), the inner part of the supporting long rod (17) being threadedly connected to a fourth screw rod (16), one side of the connecting long rod (9) being fixedly connected to a connecting cylinder (8), the inner part of the connecting cylinder (8) being fixedly connected to a supporting column (40), the top and bottom of the supporting column (40) being fixedly connected to a connecting column (30), one end of the connecting column (30) away from the supporting column (40) being fixedly connected to a limiting column (4), and the outer surface of the connecting column (30) being respectively provided with a third thread groove (31) and a fourth thread groove (39).

6. A pesticide application device for circulating fumigation of grain depots according to claim 1, 2 or 5, characterized in that: The second limiting assembly comprises two first support rings (5), the two first support rings (5) are fixedly mounted on the outer side surface of the top end of the drug application tube (3), a connecting square rod (22) is fixedly connected between the two first support rings (5), the connecting square rod (22) is fixedly mounted on the outer side surface of the drug application tube (3), a seventh thread groove (21) is provided on the front side of the connecting square rod (22), the seventh thread groove (21) is threadedly connected to the fourth screw rod (16), a connecting tube (8) is rotatably mounted between the two first support rings (5), a connecting column (30) is rotatably mounted inside the ring body of the first support ring (5), the limiting column (4) is rotatably connected to the first support ring (5), a first support block (7) is fixedly connected to the outer side surface of the first support ring (5), and the second screw rod (6) is threadedly connected to the interior of the first support block (7) and the interior of the ring body of the first support ring (5).

7. The device for applying medicine for circulating fumigation of grain depots according to claim 4, characterized in that: The second limiting assembly comprises two first support rings (5), the two first support rings (5) are fixedly mounted on the outer side surface of the top end of the drug application tube (3), a connecting square rod (22) is fixedly connected between the two first support rings (5), the connecting square rod (22) is fixedly mounted on the outer side surface of the drug application tube (3), a seventh thread groove (21) is provided on the front side of the connecting square rod (22), the seventh thread groove (21) is threadedly connected to the fourth screw rod (16), a connecting tube (8) is rotatably mounted between the two first support rings (5), a connecting column (30) is rotatably mounted inside the ring body of the first support ring (5), the limiting column (4) is rotatably connected to the first support ring (5), a first support block (7) is fixedly connected to the outer side surface of the first support ring (5), and the second screw rod (6) is threadedly connected to the interior of the first support block (7) and the interior of the ring body of the first support ring (5).

8. A pesticide application device for circulating fumigation of grain depots according to claim 1, 2, 5 or 7, characterized in that: The anti-scratch component comprises a protective tube (19), the protective tube (19) is slidably mounted on the outer side surface of the bottom end of the drug application tube (3), the inner side surface of the protective tube (19) is respectively provided with a connecting long hole (27) and a limiting long groove (37), the connecting long hole (27) is slidably connected to the connecting vertical plate (26), the limiting long groove (37) is slidably connected to the limiting long plate (38), the outer side surface of the protective tube (19) is respectively fixedly connected to the inner arc plate (28) and the second support block (13), and the interior of the second support block (13) and the interior of the ring body of the protective tube (19) are commonly threadedly connected to the third screw (12).

9. The pesticide application device for circulating fumigation of grain depots according to claim 6, characterized in that: The anti-scratch component comprises a protective tube (19), the protective tube (19) is slidably mounted on the outer side surface of the bottom end of the drug application tube (3), the inner side surface of the protective tube (19) is respectively provided with a connecting long hole (27) and a limiting long groove (37), the connecting long hole (27) is slidably connected to the connecting vertical plate (26), the limiting long groove (37) is slidably connected to the limiting long plate (38), the outer side surface of the protective tube (19) is respectively fixedly connected to the inner arc plate (28) and the second support block (13), and the interior of the second support block (13) and the interior of the ring body of the protective tube (19) are commonly threadedly connected to the third screw (12).

10. A pesticide application device for circulating fumigation of grain depots according to claim 1, 2, 5, 7 or 9, characterized in that: The support assembly comprises a second support ring (11), the second support ring (11) is fixedly mounted on the outer side surface of the bottom end of the drug application tube (3), an outer arc plate (14) is fixedly connected to the bottom of the second support ring (11), the outer arc plate (14) is slidably connected to the protective tube (19), an arc-shaped long groove (29) is formed on the inner side surface of the outer arc plate (14), and the arc-shaped long groove (29) is slidably connected to the inner arc plate (28).

Images