Agricultural straw smashing device

Abstract

The utility model relates to the technical field of agricultural straw, in particular to an agricultural straw smashing device. L-shaped supporting rods are fixed to the two sides of the top of the base, an operation sleeve is fixed to the sides, close to each other, of the two L-shaped supporting rods, a separation structure is arranged on one side of the operation sleeve, an upper cover is arranged on the top of the operation sleeve, a bottom sleeve is arranged at the bottom of the operation sleeve, and one side of the bottom sleeve and one side of the upper cover are fixed to the separation structure. A cutting structure is arranged on the top of the upper cover. According to the agricultural straw smashing device, due to the design of a separation structure, feeding and discharging can be facilitated, meanwhile, a user can easily observe the interior of the device, cleaning work is more convenient and faster, and sanitation and smashing efficiency of the device can be kept easily; through the design of a cutting structure, the device can generate stronger cutting force through reverse rotation of two cutting parts, and straw can be cut up more effectively.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural straw technical field especially relates to a kind of agricultural straw pulverizing device. BACKGROUND

[0002] With the rapid development of agricultural production, a large amount of crop straw such as corn straw, straw, peanut shell and the like is generated. If these straws are not properly treated, not only a large amount of land resources will be occupied, but also they may become a source of environmental pollution, affecting ecological balance. Meanwhile, with the increasing environmental awareness, how to efficiently and environmentally treat these agricultural wastes and realize the recycling of resources has become a problem to be solved.

[0003] For example, Chinese utility model patent (CN219373175U) discloses an agricultural straw pulverizing device, which solves the following problems: the existing agricultural straw pulverizing device cuts and pulverizes the straw by moving blades when in use. The single blade makes the pulverizing efficiency of the straw not high, and some straws are not completely pulverized, resulting in poor pulverizing effect.

[0004] The device comprises a box body, a grinding box is arranged below the box body, a through opening is formed in the lower end of the box body and the upper end of the grinding box, a cutting assembly and a pulverizing assembly are arranged in the box body, a grinding assembly is arranged in the grinding box, the cutting assembly comprises a first motor, a first blade, a second motor and a second blade, the first motor and the second motor are respectively installed on the two sides of the box body, a first rotating shaft is connected to the output end of the first motor, the first blade is installed on the outer wall of the first rotating shaft, a second rotating shaft is connected to the output end of the second motor, and the utility model improves the pulverizing efficiency of the device on the agricultural straw when in use, the straw first passes through the cutting assembly, then passes through the pulverizing assembly, and finally passes through the grinding assembly, so that the straw is pulverized more completely.

[0005] When using the above-mentioned technology, it is found that the following technical problems exist in the prior art: the two motors of the device need to operate simultaneously, so the frequency and difficulty of maintenance will increase accordingly. Once one of the motors fails, the operation of the entire pulverizing device may be affected. Therefore, we designed an agricultural straw pulverizing device to provide another technical solution to the above technical problems. UTILITY MODEL CONTENTS

[0006] Therefore, it is necessary to provide an agricultural straw pulverizing device to solve the problems raised in the above background art in view of the above technical problems.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] An agricultural straw crushing device includes a base, L-shaped support rods are fixed on both sides of the top of the base, an operating sleeve is fixed on the side where the two L-shaped support rods are close to each other, a separation structure is provided on one side of the operating sleeve, an upper cover is provided on the top of the operating sleeve, and a bottom sleeve is provided on the bottom of the operating sleeve. One side of the bottom sleeve and the upper cover are fixed to the separation structure, and a cutting structure is provided on the top of the upper cover.

[0009] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the separation structure includes a concave block, a first motor, a worm, a worm wheel, a connecting rod and a screw. A concave block is fixed at one end of the outer side of the operating sleeve, a first motor is fixed at one end of the concave block, a worm is rotatably connected to the inner side of the concave block, the output end of the first motor is fixed to the worm, one side of the worm is meshed with a worm wheel, a connecting rod is fixed to the inner side of the worm wheel, and screws are fixed at the top and bottom of the connecting rod. The threads of the two screws have opposite rotation directions, and the screw at the bottom is rotatably connected to the base.

[0010] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the separation structure also includes a top block, a slide rod and a moving block. A slide rod is fixed on one side of the top of the base, and a top block is fixed on the top of the slide rod. The screw rod located at the top is rotatably connected to the top block, and the outer sides of the two screw rods are threadedly connected to the moving blocks. The two moving blocks are slidably connected to the slide rod, the moving block at the top is fixed to the upper cover, and the moving block at the bottom is fixed to the bottom sleeve.

[0011] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the cutting structure includes a speed regulating mechanism, a rotating cutting mechanism and a moving mechanism. The moving mechanism is provided on one side of the top of the upper cover, the top of the moving mechanism is provided with a speed regulating mechanism, and the rotating cutting mechanism is provided near the midpoint of the top of the upper cover. The speed regulating mechanism and the rotating cutting mechanism are connected.

[0012] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the moving mechanism includes a second motor, a screw rod and a T-shaped block. The inner side of one end of the upper cover is slidingly connected to the T-shaped block, the inner side of the T-shaped block is threadedly connected to the screw rod, the second motor is fixed to the inner side of the upper cover, and the output end of the second motor is fixed to the screw rod.

[0013] As a preferred embodiment of the agricultural straw crushing device provided by the present invention, a T-shaped hole is opened on one side of the top of the upper cover, and the upper cover is slidably connected to the T-shaped block through the T-shaped hole.

[0014] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the speed regulating mechanism includes a concave plate, a third motor, a rotating rod, a first gear, a second gear, a connecting block, a third gear, a fourth gear and a rotating stick, a concave plate is fixed on the top of the T-shaped block, one end of the concave plate is fixed to the third motor, the inner side of the concave plate is rotatably connected to the rotating rod, the output end of the third motor is fixed to the rotating rod, one end of the outer side of the rotating rod is fixed to the first gear, and the other end of the outer side of the rotating rod is fixed to the second gear, connecting blocks are fixed at both ends of one side of the top of the upper cover, and the side of the two connecting blocks close to each other is rotatably connected to the rotating stick, one end of the outer side of the rotating stick is fixed to the third gear, and the other end of the outer side of the rotating stick is fixed to the fourth gear, the third gear and the second gear are meshed and connected, and the first gear and the fourth gear are meshed and connected.

[0015] As a preferred embodiment of the agricultural straw crushing device provided by the present invention, when the third gear and the second gear are meshed and connected, the first gear and the fourth gear are not connected; when the first gear and the fourth gear are meshed and connected, the third gear and the second gear are not connected.

[0016] As a preferred embodiment of the agricultural straw crushing device provided by the utility model, the rotating cutting mechanism includes a first bevel gear, a second bevel gear, a third bevel gear, a first rotating column, a second rotating column and a cutting knife. The first bevel gear is fixed to one side of the rotating rod, and the first rotating column is rotatably connected to the inner side of the upper cover near the midpoint. The inner side of the first rotating column is rotatably connected to the second rotating column, and the second bevel gear is fixed to the top of the outer side of the second rotating column. The third bevel gear is fixed to the outer side of the first rotating column. The second bevel gear and the third bevel gear are both meshed with the first bevel gear. Multiple cutting knives are fixed to the outer sides of the first rotating column and the second rotating column, and the blade directions of the multiple cutting knives are opposite.

[0017] It can be seen without a doubt that the above-mentioned technical solution of this application can definitely solve the technical problem to be solved by this application.

[0018] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0019] The utility model provides an agricultural straw crushing device. The device is designed with a separation structure, which makes it easy to add and unload materials. At the same time, it allows users to easily observe the inside of the device, making cleaning more convenient, which helps to maintain the hygiene of the device and the crushing efficiency.

[0020] The device's cutting structure is designed so that the device can generate stronger cutting force through the reverse rotation of the two cutting parts, and can chop the straw more effectively. This design helps to reduce the energy and time required in the crushing process, thereby improving the overall crushing efficiency, and the device helps to reduce straw entanglement and blockage, further improving the crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of an agricultural straw crushing device of the present utility model;

[0023] Figure 2 This is a schematic diagram of the opening of the bottom cover and the upper cover of an agricultural straw crushing device of the utility model;

[0024] Figure 3 This is a cross-sectional view of the operating sleeve, bottom sleeve, and upper cover of an agricultural straw crushing device of the utility model;

[0025] Figure 4 This is a schematic diagram of the connection between the worm and the worm wheel of an agricultural straw crushing device of the present utility model;

[0026] Figure 5 This is a schematic diagram of the connection between the rotating rod and the first bevel gear of an agricultural straw crushing device of the present utility model;

[0027] Figure 6 This is a schematic diagram of the connection between the concave plate and the third motor of an agricultural straw crushing device of the present utility model;

[0028] Figure 7 This is a schematic diagram of the connection between the first rotating column and the second rotating column of an agricultural straw crushing device of the present utility model;

[0029] Figure 8 This is a schematic diagram of the connection between the T-shaped block and the concave plate of an agricultural straw crushing device of the present utility model;

[0030] Figure 9 The utility model is a cross-sectional view of an upper cover of an agricultural straw crushing device.

[0031] In the figure: 1. base; 2. L-shaped support rod; 3. operating sleeve; 4. bottom sleeve; 5. upper cover; 6. concave block; 7. first motor; 8. worm; 9. worm gear; 10. connecting rod; 11. screw; 12. top block; 13. slide bar; 14. moving block; 15. second motor; 16. lead screw; 17. T-shaped block; 18. concave plate; 19. third motor; 20. rotating rod; 21. first gear; 22. second gear; 23. connecting block; 24. third gear; 25. fourth gear; 26. rotating rod; 27. first bevel gear; 28. second bevel gear; 29. ​​third bevel gear; 30. first rotating column; 31. second rotating column; 32. cutting knife. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] As described in the background art, the two motors of the device need to operate simultaneously, so the frequency and difficulty of maintenance will increase accordingly. Once one of the motors fails, the operation of the entire pulverizing device may be affected.

[0034] In order to solve this technical problem, the utility model provides an agricultural straw crushing device.

[0035] Specifically, please refer to Figures 1-9 An agricultural straw crushing device specifically includes: a base 1, L-shaped support rods 2 are fixed on both sides of the top of the base 1, an operating cover 3 is fixed on the side where the two L-shaped support rods 2 are close to each other, one side of the operating cover 3 is provided with a separation structure, the top of the operating cover 3 is provided with an upper cover 5, the bottom of the operating cover 3 is provided with a bottom cover 4, one side of the bottom cover 4 and the upper cover 5 are fixed to the separation structure, and the top of the upper cover 5 is provided with a cutting structure.

[0036] The utility model provides an agricultural straw crushing device. The device is designed with a separation structure, which makes it easy to add and unload materials. At the same time, it allows users to easily observe the inside of the device, making cleaning more convenient, which helps to maintain the hygiene of the device and the crushing efficiency.

[0037] The device's cutting structure is designed so that the device can generate stronger cutting force through the reverse rotation of the two cutting parts, and can chop the straw more effectively. This design helps to reduce the energy and time required in the crushing process, thereby improving the overall crushing efficiency, and the device helps to reduce straw entanglement and blockage, further improving the crushing efficiency.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] Reference Figures 1-9 An agricultural straw crushing device includes a base 1, L-shaped support rods 2 are fixed on both sides of the top of the base 1, an operating cover 3 is fixed on the side where the two L-shaped support rods 2 are close to each other, one side of the operating cover 3 is provided with a separation structure, the top of the operating cover 3 is provided with an upper cover 5, and the bottom of the operating cover 3 is provided with a bottom cover 4, one side of the bottom cover 4 and the upper cover 5 are fixed to the separation structure, and the top of the upper cover 5 is provided with a cutting structure.

[0041] The separation structure includes a concave block 6, a first motor 7, a worm 8, a worm wheel 9, a connecting rod 10, a screw 11, a top block 12, a slide rod 13 and a moving block 14. The concave block 6 is fixed to one end of the outer side of the operating sleeve 3, the first motor 7 is fixed to one end of the concave block 6, the worm 8 is rotatably connected to the inner side of the concave block 6, the output end of the first motor 7 is fixed to the worm 8, one side of the worm 8 is meshed with the worm wheel 9, the connecting rod 10 is fixed to the inner side of the worm wheel 9, the top and bottom of the connecting rod 10 are fixed with screws 11, and the two The threads of the screw rods 11 rotate in opposite directions. The screw rod 11 at the bottom is rotatably connected to the base 1. A sliding rod 13 is fixed to one side of the top of the base 1. A top block 12 is fixed to the top of the sliding rod 13. The screw rod 11 at the top is rotatably connected to the top block 12. The outer sides of the two screw rods 11 are threadedly connected to moving blocks 14. The two moving blocks 14 are slidably connected to the sliding rod 13. The top moving block 14 is fixed to the upper cover 5, and the bottom moving block 14 is fixed to the bottom sleeve 4, so that the separation structure can open the device.

[0042] The cutting structure includes a speed regulating mechanism, a rotating cutting mechanism and a moving mechanism. A moving mechanism is provided on one side of the top of the upper cover 5, a speed regulating mechanism is provided on the top of the moving mechanism, and a rotating cutting mechanism is provided near the midpoint of the top of the upper cover 5. The speed regulating mechanism and the rotating cutting mechanism are connected, so that the cutting structure can efficiently cut straw.

[0043] The moving mechanism includes a second motor 15, a screw rod 16 and a T-shaped block 17. The inner side of one end of the upper cover 5 is slidably connected to the T-shaped block 17, and the inner side of the T-shaped block 17 is threadedly connected to the screw rod 16. The second motor 15 is fixed to the inner side of the upper cover 5, and the output end of the second motor 15 is fixed to the screw rod 16, so that the moving mechanism can drive the T-shaped block 17 to move.

[0044] A T-shaped hole is opened on one side of the top of the upper cover 5 , and the upper cover 5 is slidably connected to the T-shaped block 17 through the T-shaped hole, so that the upper cover 5 and the T-shaped block 17 can be stably connected.

[0045] The speed regulating mechanism includes a concave plate 18, a third motor 19, a rotating rod 20, a first gear 21, a second gear 22, a connecting block 23, a third gear 24, a fourth gear 25 and a rotating rod 26. The concave plate 18 is fixed to the top of the T-shaped block 17, and the third motor 19 is fixed to one end of the concave plate 18. The inner side of the concave plate 18 is rotatably connected to the rotating rod 20. The output end of the third motor 19 is fixed to the rotating rod 20. The first gear 21 is fixed to one end of the outer side of the rotating rod 20, and the second gear 22 is fixed to the other end of the outer side of the rotating rod 20. Connecting blocks are fixed to both ends of the top side of the upper cover 5. 23. The side of the two connecting blocks 23 that are close to each other is rotatably connected with a rotating rod 26. A third gear 24 is fixed to one end of the outer side of the rotating rod 26, and a fourth gear 25 is fixed to the other end of the outer side of the rotating rod 26. The third gear 24 and the second gear 22 are meshed and connected, and the first gear 21 and the fourth gear 25 are meshed and connected. When the third gear 24 and the second gear 22 are meshed and connected, the first gear 21 and the fourth gear 25 are not connected. When the first gear 21 and the fourth gear 25 are meshed and connected, the third gear 24 and the second gear 22 are not connected, so that the rotation speed of the device can be adjusted.

[0046] The rotary cutting mechanism includes a first bevel gear 27, a second bevel gear 28, a third bevel gear 29, a first rotating column 30, a second rotating column 31 and a cutting knife 32. The first bevel gear 27 is fixed to one side of the rotating rod 26, and the first rotating column 30 is rotatably connected to the inner side of the upper cover 5 near the midpoint. The inner side of the first rotating column 30 is rotatably connected to the second rotating column 31, and the second bevel gear 28 is fixed to the top of the outer side of the second rotating column 31. The third bevel gear 29 is fixed to the outer side of the first rotating column 30. The second bevel gear 28 and the third bevel gear 29 are both meshed with the first bevel gear 27. Multiple cutting knives 32 are fixed to the outer sides of the first rotating column 30 and the second rotating column 31. The blades of the multiple cutting knives 32 are in opposite directions, so that the rotary cutting mechanism can cut efficiently.

[0047] The utility model provides an agricultural straw crushing device. The device is designed with a separation structure, which makes it easy to add and unload materials. At the same time, it allows users to easily observe the inside of the device, making cleaning more convenient, which helps to maintain the hygiene of the device and the crushing efficiency.

[0048] The device's cutting structure is designed so that the device can generate stronger cutting force through the reverse rotation of the two cutting parts, and can chop the straw more effectively. This design helps to reduce the energy and time required in the crushing process, thereby improving the overall crushing efficiency, and the device helps to reduce straw entanglement and blockage, further improving the crushing efficiency.

[0049] The use process of the agricultural straw crushing device provided by the present invention is as follows: the user turns on the first motor 7 to rotate, and the output end of the first motor 7 drives the worm 8 to rotate. Since one side of the worm 8 is meshed and connected with the worm wheel 9, the rotation of the worm 8 drives the worm wheel 9 to rotate, and then drives the connecting rod 10 to rotate. The rotation of the connecting rod 10 drives the two screws 11 to rotate. The threads of the two screws 11 rotate in opposite directions, and the rotation of the two screws 11 drives the two moving blocks 14 to move closer to or away from each other, thereby driving the bottom sleeve 4 and the upper cover 5 to leave the operating sleeve 3, so that the user can put the straw into the top of the bottom sleeve 4. The user rotates the first motor 7 in the opposite direction, and the rotation of the first motor 7 drives the worm 8 to rotate in the opposite direction, thereby closing the bottom sleeve 4 and the upper cover 5 at the top and bottom of the operating sleeve 3. The user energizes and rotates the third motor 19, and the output end of the third motor 19 drives the rotating rod 20 to rotate. The rotation of the rotating rod 20 drives the second gear 22 to rotate. Since one side of the second gear 22 is meshed with the third gear 24, the rotation of the second gear 22 drives the third gear 24 to rotate, thereby driving the rotating rod 26 and the first bevel gear 27 to rotate. Since one side of the first bevel gear 27 is meshed with the second bevel gear 28 and the third bevel gear 29, the third bevel gear 28 is meshed with the third bevel gear 29. The rotation of the first bevel gear 27 drives the second bevel gear 28 and the third bevel gear 29 to rotate in the opposite direction, so that the first rotating column 30 and the second rotating column 31 rotate in the opposite direction, and at the same time drives the multiple cutting knives 32 with opposite blades to rotate in the opposite direction, so that the straw can be cut efficiently, thereby ensuring that the straw can be cut evenly and fully in all directions, thereby improving the crushing efficiency; when the type of straw is different and the cutting speed needs to be adjusted, the user energizes the second motor 15 to rotate, and the output end of the second motor 15 drives the screw rod 16 to rotate. Since the outer side of the screw rod 16 is threadedly connected to the T-shaped block 17, the T-shaped block 17 can be 5 slides inside, thereby driving the concave plate 18 to move. The movement of the concave plate 18 drives the second gear 22 to disengage from the meshing connection with the third gear 24, and at the same time enables the first gear 21 to resume the meshing connection with the fourth gear 25, so that the rotation speed of the rotating roller 26 and the first bevel gear 27 can be adjusted, so that different straw types can be optimized for crushing. Harder straw can be appropriately increased in speed to increase the cutting force, while softer straw can be reduced in speed to avoid over-crushing. In summary, the device has the advantages of high efficiency, safety, and easy maintenance, can effectively solve the problem of crop straw processing, and promote sustainable agricultural development.

[0050] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. An agricultural straw crushing device, comprising a base (1), characterized in that: L-shaped support rods (2) are fixed to both sides of the top of the base (1); an operating sleeve (3) is fixed to the side where the two L-shaped support rods (2) are close to each other; a separation structure is provided on one side of the operating sleeve (3); an upper cover (5) is provided on the top of the operating sleeve (3); a bottom sleeve (4) is provided on the bottom of the operating sleeve (3); one side of the bottom sleeve (4) and the upper cover (5) are fixed to the separation structure; and a cutting structure is provided on the top of the upper cover (5).

2. The agricultural straw crushing device according to claim 1, characterized in that: The separation structure comprises a concave block (6), a first motor (7), a worm (8), a worm wheel (9), a connecting rod (10) and a screw (11); a concave block (6) is fixed to one end of the outer side of the operating sleeve (3); a first motor (7) is fixed to one end of the concave block (6); a worm (8) is rotatably connected to the inner side of the concave block (6); an output end of the first motor (7) is fixed to the worm (8); one side of the worm (8) is meshedly connected to the worm wheel (9); a connecting rod (10) is fixed to the inner side of the worm wheel (9); screws (11) are fixed to the top and bottom of the connecting rod (10); the threads of the two screws (11) are in opposite directions; the screw (11) at the bottom is rotatably connected to the base (1).

3. The agricultural straw crushing device according to claim 2, characterized in that: The separation structure further comprises a top block (12), a slide rod (13) and a moving block (14); a slide rod (13) is fixed on one side of the top of the base (1); a top block (12) is fixed on the top of the slide rod (13); the screw rod (11) at the top is rotatably connected to the top block (12); the outer sides of the two screw rods (11) are threadedly connected to the moving blocks (14); the two moving blocks (14) are slidably connected to the slide rod (13); the moving block (14) at the top is fixed to the upper cover (5); and the moving block (14) at the bottom is fixed to the bottom sleeve (4).

4. The agricultural straw crushing device according to claim 3, characterized in that: The cutting structure comprises a speed regulating mechanism, a rotating cutting mechanism and a moving mechanism. The moving mechanism is provided on one side of the top of the upper cover (5), the speed regulating mechanism is provided on the top of the moving mechanism, and the rotating cutting mechanism is provided near the midpoint of the top of the upper cover (5). The speed regulating mechanism and the rotating cutting mechanism are connected.

5. The agricultural straw crushing device according to claim 4, characterized in that: The moving mechanism comprises a second motor (15), a screw rod (16) and a T-shaped block (17); the inner side of one end of the upper cover (5) is slidably connected to the T-shaped block (17); the inner side of the T-shaped block (17) is threadedly connected to the screw rod (16); the second motor (15) is fixed to the inner side of the upper cover (5); and the output end of the second motor (15) is fixed to the screw rod (16).

6. The agricultural straw crushing device according to claim 5, characterized in that: A T-shaped hole is provided on one side of the top of the upper cover (5), and the upper cover (5) is slidably connected to the T-shaped block (17) via the T-shaped hole.

7. The agricultural straw crushing device according to claim 6, characterized in that: The speed regulating mechanism comprises a concave plate (18), a third motor (19), a rotating rod (20), a first gear (21), a second gear (22), a connecting block (23), a third gear (24), a fourth gear (25) and a rotating rod (26); the concave plate (18) is fixed on the top of the T-shaped block (17); the third motor (19) is fixed on one end of the concave plate (18); the rotating rod (20) is rotatably connected to the inner side of the concave plate (18); the output end of the third motor (19) is fixed to the rotating rod (20); and the outer end of the rotating rod (20) is fixed. A first gear (21) is provided, a second gear (22) is fixed to the other end of the outer side of the rotating rod (20), connecting blocks (23) are fixed to both ends of one side of the top of the upper cover (5), a rotating rod (26) is rotatably connected to one side of the two connecting blocks (23) close to each other, a third gear (24) is fixed to one end of the outer side of the rotating rod (26), a fourth gear (25) is fixed to the other end of the outer side of the rotating rod (26), the third gear (24) is meshed with the second gear (22), and the first gear (21) is meshed with the fourth gear (25).

8. The agricultural straw crushing device according to claim 7, characterized in that: When the third gear (24) and the second gear (22) are meshed and connected, the first gear (21) and the fourth gear (25) are not connected; when the first gear (21) and the fourth gear (25) are meshed and connected, the third gear (24) and the second gear (22) are not connected.

9. The agricultural straw crushing device according to claim 8, characterized in that: The rotary cutting mechanism comprises a first bevel gear (27), a second bevel gear (28), a third bevel gear (29), a first rotating column (30), a second rotating column (31) and a cutting knife (32); the first bevel gear (27) is fixed on one side of the rotating rod (26); the first rotating column (30) is rotatably connected to the inner side of the upper cover (5) near the midpoint; the second rotating column (31) is rotatably connected to the inner side of the first rotating column (30); the second bevel gear (28) is fixed to the top of the outer side of the second rotating column (31); the third bevel gear (29) is fixed to the outer side of the first rotating column (30); the second bevel gear (28) and the third bevel gear (29) are both meshed and connected with the first bevel gear (27); a plurality of cutting knives (32) are fixed on the outer sides of the first rotating column (30) and the second rotating column (31); and the blades of the plurality of cutting knives (32) are in opposite directions.

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