A rotary cultivator with adjustable depth

Abstract

The application relates to the technical field of agricultural planting, and discloses a rotary cultivator with adjustable ploughing depth, which comprises a machine body, a depth adjusting mechanism and a rotary cultivator roller, the rotary cultivator roller is provided with a connecting mechanism and a nut limiter, and the rotary cultivator roller is connected with rotary cultivator blades through the connecting mechanism. The rotary cultivator with adjustable ploughing depth is provided with the connecting mechanism, the rotary cultivator blades are preliminarily positioned through the installation box blade installation groove, the oblique angle design of the blades and the butt joint blocks facilitates automatic avoidance during insertion, the spring of the reset device can push the butt joint blocks to be inserted into the butt joint grooves, simultaneously push the blades to the positioning blocks so that the blades are clamped into the positioning grooves, and the pre-fixing is quickly completed; when fastening, the nut limiter fixes the hexagonal nut through the limiting plate and the trapezoidal limiting block, only the bolt needs to be rotated to be locked; when disassembling, the blades can be released from the limiting after the bolt is loosened, two wrenches are not needed to be used by two persons, the operation process is greatly simplified, the blade replacement time is shortened, and the ploughing operation interruption time is reduced.

Description

Technical Field

[0001] This invention relates to the field of agricultural planting technology, specifically to a rotary tiller with adjustable tillage depth. Background Technology

[0002] In the field of agricultural mechanization, rotary tillers, as the core equipment for soil tillage, are widely used in the land preparation stage before planting crops such as wheat, corn, and rice. They use high-speed rotating blades to break up the soil and remove weeds, creating a loose and level soil environment for seed germination and crop growth. Different crops (such as shallow-rooted vegetables and deep-rooted cotton) and different soil types (such as sandy loam and clay loam) have significantly different requirements for tillage depth. Tillage that is too shallow can lead to insufficient soil maturation layer, affecting crop root development. Tillage that is too deep will increase power consumption and may turn the subsoil to the surface, reducing soil fertility. With the increasing precision of agricultural planting, rotary tillers with adjustable tillage depth have become the mainstream in the market. The ease of adjustment, maintenance efficiency, and operational safety of the equipment are gradually becoming key indicators for measuring its performance, driving the upgrade of rotary tillers towards "precise depth control, convenient maintenance, and safety and reliability".

[0003] The existing rotary tillers with adjustable tillage depth are primarily composed of a frame, rotary tillage rollers, a depth-limiting wheel-type depth adjustment mechanism, a transmission system, and a power input device. These components work together to achieve both tillage depth adjustment and soil tillage. The frame is a steel structure used to secure all components, and its front end connects to a tractor or other power machinery via a suspension bracket, providing overall traction and support. The rotary tillage roller consists of a drive shaft and evenly distributed blades. The blades are bolted to the blade holders on the drive shaft, which is connected to the frame at both ends via bearing seats. Driven by the transmission system, it rotates at high speed to shred the soil. The depth adjustment mechanism is centered around an adjustable depth-limiting wheel, which is connected to both sides of the frame via a telescopic bracket. The bracket has multiple sets of adjustment holes or a screw adjustment structure. During adjustment... By changing the fixed height of the depth limiting wheel on the support (e.g., inserting the fixing bolt into adjustment holes of different heights, or turning the screw handwheel to drive the depth limiting wheel to rise or fall), the maximum downward movement distance of the rotary tiller during operation can be limited. The lower the height of the depth limiting wheel, the smaller the downward sinking space of the rotary tiller and the shallower the tilling depth; the higher the height of the depth limiting wheel, the larger the downward sinking space of the rotary tiller and the deeper the tilling depth, thus achieving precise adjustment of tilling depth within the range of 10-30cm. The depth limiting wheel also serves as an auxiliary support, enhancing the stability of the rotary tiller during operation and preventing the equipment from tilting due to uneven soil resistance. The transmission system includes pulleys, chains, gearboxes, etc., which transmit the tractor's power to the drive shaft via the power input device, driving the rotary tiller roller to rotate at high speed to complete the tilling operation.

[0004] Existing depth-adjustable rotary tillers have significant drawbacks in blade maintenance and replacement. Debris such as buried stones, tree stumps, and residual mulch in the farmland easily collide with the high-speed rotating blades during tillage, causing them to chip, roll, or break, requiring frequent shutdowns for replacement. Furthermore, existing blades are rigidly connected to the blade holder on the drive shaft via at least two bolts. The drive shaft typically has 10-20 sets of blades evenly distributed, requiring operators to use two wrenches simultaneously – one to tighten the nut and the other to loosen the bolt. This process presents several problems: firstly, the large number of blades and the cumbersome disassembly steps result in extremely long replacement times, severely impacting tillage efficiency; secondly, the limited space in the drive shaft area, requiring at least two people to operate the machine (two wrenches), further increases the difficulty of disassembly. Therefore, improvements to the existing depth-adjustable rotary tiller are urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a rotary tiller with adjustable tillage depth to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rotary tiller with adjustable tillage depth, comprising a body, a depth adjustment mechanism and a rotary tillage blade roller, wherein the rotary tillage blade roller is provided with a connecting mechanism and a nut limiter, and the rotary tillage blade roller is connected to rotary tillage blades through the connecting mechanism;

[0007] The connecting mechanism includes:

[0008] The mounting plate has multiple sets of the rotary tiller rollers installed at equal intervals, and the mounting plate has a mounting box that is slidably connected to the rotary tiller blades.

[0009] A docking groove is formed on the outer wall of the rotary tiller blade. A docking block corresponding to the docking groove is slidably installed on the mounting box, and a pad connected to the docking block is provided on the outer wall of the mounting box.

[0010] A positioning block is installed on the outer wall of the mounting plate, and the outer wall of the rotary tiller blade is provided with a positioning groove corresponding to the positioning block;

[0011] A bolt that slides into the pad, with the other end of the bolt located outside the mounting plate, and a hexagonal nut threaded onto the end of the bolt;

[0012] A resetter, which is installed in the mounting box and connected to the pad, is used to push the mating block into the mating groove;

[0013] The nut limiter is used to restrict the position of the hexagonal nut.

[0014] Preferably, the body consists of a frame, a suspension frame, a power output mechanism, and a transmission mechanism.

[0015] Preferably, the mounting box and the mounting plate are detachably connected, and the mounting box has a blade mounting groove corresponding to the tip of the rotary tiller blade, and the width of the blade mounting groove is greater than the thickness of the tip of the rotary tiller blade.

[0016] The mounting box has a movable groove corresponding to the docking block, and the length of the docking block is greater than the thickness of the mounting box, so that the end of the docking block is located inside the blade mounting groove.

[0017] Two sets of docking blocks are symmetrically installed on the inner wall of the pad, and the thickness of the docking blocks is greater than the width of the docking groove. The inner wall of the mounting box is also provided with a receiving groove that mates with the docking blocks.

[0018] Preferably, the corner of the top of the rotary tiller blade near the docking block and the corner of the top of the docking block near the rotary tiller blade are both designed at bevels, and the distance between the bottom and top of the bevel at the top of the rotary tiller blade is greater than the length of the docking block in the blade mounting groove.

[0019] The docking groove and positioning groove are respectively formed on the outer walls of the two sides of the rotary tiller blade.

[0020] Preferably, the end face of the docking groove is designed with an inclined surface corresponding to the docking block, and the depth of the docking groove is less than the length of the docking block in the blade mounting groove. Furthermore, as the docking block moves into the docking groove, it will push the rotary tillage blade towards the positioning block.

[0021] Multiple sets of positioning blocks are installed at equal angles on the outer wall of the mounting plate. Each set of positioning blocks contains two or more positioning blocks, and the number of positioning blocks in each set is the same. The outer corners of the positioning blocks are designed with bevels.

[0022] After the positioning block enters the positioning groove, the surface that is in contact with the positioning groove is a plane, and the thickness of the positioning block is less than the gap between the outer wall of the rotary tiller blade and the inner wall of the blade mounting groove.

[0023] Preferably, the mounting plate, mounting box, and pad are all provided with through holes corresponding to the bolts, and the outer openings of the through holes are all designed to open outwards to reduce the difficulty of the bolts passing through the through holes.

[0024] One end of the bolt has its inner wall in contact with the outer wall of the pad, and the other end is fitted with a washer that is in contact with the outer wall of the mounting plate, and the washer is in contact with the inner wall of the hexagonal nut.

[0025] Preferably, the resetter consists of a transmission frame, a transmission disc, a transmission groove, and a spring;

[0026] The transmission frame has multiple sets fixedly installed on the inner wall of the pad, and a transmission disc is installed at the end of the transmission frame. The installation box has a transmission groove corresponding to the transmission disc and the transmission frame, and a spring connected to the transmission groove and the transmission disc is sleeved on the outer wall of the transmission frame. When the pad slides outward, the transmission disc will compress the spring.

[0027] Preferably, multiple sets of the mounting box are installed at equal angles on the outer wall of the mounting plate, and the mating blocks, bolts and resetters installed on the mounting box are staggered with each other.

[0028] Preferably, the nut limiter includes:

[0029] The mounting brackets are installed in multiple sets at equal angles on the outer wall of the mounting plate on the side away from the mounting box. Each set consists of two mounting brackets, and the two mounting brackets are symmetrically arranged on both sides of the hexagonal nut.

[0030] The limiting plate is fixedly installed on the outer wall of the end of the mounting bracket near the hexagonal nut, and the outer wall of the limiting plate is in contact with the outer wall of the hexagonal nut that is in a plane, and the length of the limiting plate is greater than the length of the outer wall of the hexagonal nut that is in a plane;

[0031] The limiting block, which is installed on the outer wall of the limiting plate, is used to further restrict the position of the hexagonal nut.

[0032] Preferably, the limiting block has a trapezoidal cross-section, and the inclined surface of the limiting block and the hexagonal nut are not in contact with the outer wall of the limiting plate;

[0033] The spacing between the mounting brackets is greater than the diameter of the gasket.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. This rotary tiller with adjustable tillage depth features a connecting mechanism that uses the blade mounting slot in the mounting box for initial blade positioning. The angled design between the blade and the connecting block facilitates automatic avoidance during insertion. The spring in the reset device pushes the connecting block into the connecting slot while simultaneously pushing the blade towards the positioning block to lock it into the positioning slot, quickly completing the pre-fixation. During tightening, the nut limiter secures the hexagonal nut via a limit plate and a trapezoidal limit block, requiring only a single turn of the bolt for locking. During disassembly, loosening the bolt and pulling the blade releases the limit, eliminating the need for two people using two wrenches, significantly simplifying the operation, shortening blade replacement time, and reducing tillage downtime.

[0036] 2. This rotary tiller with adjustable tillage depth uses two sets of connecting blocks and connecting grooves and receiving grooves to restrict the position of the blades from both sides; the positioning blocks and positioning grooves fit together to form a lateral limit, and the multiple positioning structure prevents the blades from shifting or loosening when rotating at high speed; the bolts and washers work together to increase the force-bearing area, and the nut limiter can completely prevent the hexagonal nut from loosening, further enhancing the connection stability, effectively dealing with the impact of stones, roots and other debris, reducing the risk of blade breakage and falling off, and ensuring smooth rotary tillage operation.

[0037] 3. This rotary tiller with adjustable tillage depth uses a detachable connection between the mounting box and the mounting disc. When components such as the connecting block and movable groove inside the mounting box are damaged due to long-term use, the mounting box can be disassembled and replaced separately without having to replace the entire mounting disc or rotary tiller roller, greatly reducing the cost of component replacement.

[0038] 4. This rotary tiller with adjustable tillage depth features modular design for components such as the reset spring and transmission frame, facilitating individual maintenance or replacement. Bolts, washers, and hexagonal nuts are universal standard parts, making procurement and replacement convenient. Furthermore, the flared design of the mating holes reduces the difficulty of bolt alignment during installation, further enhancing the flexibility of maintenance operations and adapting to the equipment maintenance needs of long-term, high-frequency agricultural operations. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the rotary tiller roller, connecting mechanism, and rotary tiller blades of the present invention.

[0041] Figure 3 This is a schematic diagram of the rotary tiller shaft of the present invention after being cut open;

[0042] Figure 4 This is a schematic diagram of the connection mechanism of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the mounting box of the present invention after being cut open;

[0044] Figure 6 This is a schematic diagram of the structure of some components of the connecting mechanism of the present invention;

[0045] Figure 7 This is a schematic diagram of the disassembled components in the connecting mechanism of the present invention.

[0046] Figure 8 For the present invention Figure 5 A schematic diagram of the planar structure;

[0047] Figure 9 For the present invention Figure 8 A magnified structural diagram of point A in the middle;

[0048] Figure 10 This is a schematic diagram of the nut limiter and hexagonal nut of the present invention;

[0049] Figure 11 This is a schematic diagram of the depth adjustment mechanism of the present invention;

[0050] Figure 12 This is a schematic diagram of the disassembled components of the depth adjustment mechanism of the present invention.

[0051] In the picture:

[0052] 1. Body; 10. Frame; 11. Suspension frame; 12. Power take-off mechanism; 13. Transmission mechanism;

[0053] 2. Depth adjustment mechanism; 20. Arc-shaped adjustment plate; 21. Adjustment frame; 22. Adjustment box; 220. Connecting shaft; 221. Interlocking hole; 23. Positioning hole; 24. Positioning screw;

[0054] 3. Rotary tillage blades;

[0055] 4. Connecting mechanism; 40. Mounting plate; 41. Mounting box; 42. Blade mounting slot; 43. Docking slot; 430. Positioning block; 431. Positioning slot; 44. Docking block; 440. Movable slot; 45. Pad; 46. Docking hole; 47. Bolt; 48. Hex nut; 480. Washer; 49. Resetter; 490. Transmission frame; 491. Transmission plate; 492. Transmission slot; 493. Spring;

[0056] 5. Rotary tillage blades;

[0057] 6. Nut limiter; 60. Mounting bracket; 61. Limiting plate; 62. Limiting block. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Please see Figures 1 to 12 The present invention provides a technical solution: a rotary tiller with adjustable tillage depth, including a body 1, a depth adjustment mechanism 2, a rotary tillage roller 3, a connecting mechanism 4, rotary tillage blades 5, and a nut limiter 6 and other components;

[0060] The machine body 1 is the core support and power transmission carrier of the rotary tiller, consisting of a frame 10, a suspension frame 11, a power output mechanism 12, and a transmission mechanism 13. The depth adjustment mechanism 2 is a key component for controlling the tillage depth. By changing the installation height of the depth limiting component, it limits the maximum downward space of the rotary tiller during operation, thereby adapting to the tillage depth requirements of different crops such as shallow-rooted vegetables and deep-rooted cotton, as well as different soil types such as sandy loam and clay loam. The rotary tillage roller 3 is the core execution component for soil tillage. Multiple sets of rotary tillage blades 5 are installed on its surface through the connecting mechanism 4. The high-speed rotation drives the rotary tillage blades 5 to cut the soil and remove weeds. The nut limiter 6 is installed on the mounting plate 40 in the connecting mechanism 4 to limit the position of the fasteners in the connecting mechanism 4 and prevent the fasteners from loosening during operation.

[0061] The depth adjustment mechanism 2 in this embodiment consists of an arc-shaped adjustment plate 20, an adjustment frame 21, an adjustment box 22, a connecting shaft 220, a mating hole 221, a positioning hole 23, and a positioning screw 24.

[0062] One end of the arc-shaped adjustment plate 20 is rotatably connected to the outer wall of the frame 10, and the other end is rotatably connected to the adjustment frame 21. The adjustment frame 21 is slidably connected to the adjustment box 22, and the outer wall of the adjustment box 22 is fixedly installed with the connecting shaft 220. The adjustment box 22 is rotatably connected to the outer wall of the frame 10 through the connecting shaft 220. At the same time, multiple sets of positioning holes 23 are equally spaced on the outer wall of the adjustment frame 21, and the outer wall of the adjustment box 22 is provided with a mating hole 221 corresponding to the positioning hole 23. A positioning screw 24 that is threadedly connected to the positioning hole 23 is slidably installed in the mating hole 221.

[0063] When adjusting the tillage depth, first remove the positioning screw 24 from the positioning hole 23 to release the restriction on the adjustment frame 21. Then push the arc-shaped adjustment plate 20 to rotate along its rotatable connection with the frame 10. At the same time, the rotatable connection between the adjustment frame 21 and the arc-shaped adjustment plate 20 will also rotate accordingly, and the adjustment box 22 will rotate synchronously with the adjustment frame 21 to ensure that the arc-shaped adjustment plate 20 can be adjusted smoothly. As the position of the arc-shaped adjustment plate 20 is adjusted, the adjustment frame 21 will begin to slide under the restriction of the adjustment box 22. After adjusting to the designated position, the corresponding positioning hole 23 will correspond to the insertion hole 221. At this time, re-thread the positioning screw 24 into the positioning hole 23 and fix the adjustment frame 21 again. This completes the adjustment of the tillage depth.

[0064] Specifically, the connecting mechanism 4 in this embodiment is used to realize the quick disassembly and secure fixation of the rotary tiller blade 5, which can greatly improve the blade maintenance efficiency. It specifically includes a mounting plate 40, a mounting box 41, a docking groove 43, a positioning block 430, a positioning groove 431, a docking block 44, a pad 45, a bolt 47, a hexagonal nut 48, and a resetter 49.

[0065] Multiple sets of mounting discs 40 are fixedly installed at equal intervals on the outer wall of the rotary tiller roller 3. Each set of mounting discs 40 provides a stable mounting base for the mounting box 41. The mounting box 41 and the mounting discs 40 are connected in a detachable manner, which facilitates later replacement and maintenance. At the same time, a blade mounting groove 42 adapted to the shape of the top of the rotary tiller blade 5 is opened inside the mounting box 41. The width of the blade mounting groove 42 is greater than the thickness of the top of the rotary tiller blade 5, ensuring that the top of the rotary tiller blade 5 can be easily inserted into the blade mounting groove 42.

[0066] Secondly, a movable groove 440 is provided on the side wall of the mounting box 41. A docking block 44 is slidably installed in the movable groove 440. The length of the docking block 44 is greater than the wall thickness of the mounting box 41, so that one end of the docking block 44 can be inserted into the blade mounting groove 42, and the other end is connected to the pad 45 on the outside of the mounting box 41.

[0067] Meanwhile, a docking groove 43 corresponding to the position of the docking block 44 is provided on the outer wall of the rotary tiller blade 5. The end face of the docking groove 43 is designed with an inclined surface that is adapted to the end of the docking block 44, and the depth of the docking groove 43 is less than the length of the docking block 44 extending into the blade mounting groove 42. When the docking block 44 is inserted into the docking groove 43, the rotary tiller blade 5 can be pushed to move laterally towards the positioning block 430 through the inclined surface cooperation.

[0068] The positioning block 430 is fixedly installed on the outer wall of the mounting plate 40 near the blade mounting groove 42. Multiple sets are set at equal angles on the outer wall of each mounting plate 40, and the number of positioning blocks 430 in each set is not less than two. The number of positioning blocks 430 in each set is consistent.

[0069] It should be noted that the outer corners of the positioning block 430 are designed with bevels to facilitate the smooth insertion of the rotary tiller blade 5; and the outer wall of the rotary tiller blade 5 is provided with a positioning groove 431 corresponding to the position of the positioning block 430. When the positioning block 430 enters the positioning groove 431, the surfaces of the positioning block 430 and the positioning groove 431 that are in contact are both flat, which can form a stable lateral limit; and the thickness of the positioning block 430 is less than the gap between the outer wall of the rotary tiller blade 5 and the inner wall of the blade mounting groove 42, leaving sufficient space for the lateral movement of the rotary tiller blade 5.

[0070] Two sets of docking blocks 44 are symmetrically installed on the inner wall of the pad 45 near the mounting box 41. The two sets of docking blocks 44 correspond to the two movable slots 440 on the mounting box 41 respectively. At the same time, the thickness of the docking block 44 is greater than the width of the docking slot 43, and the inner wall of the mounting box 41 is provided with a receiving slot that matches the docking block 44. When the docking block 44 is inserted into the docking slot 43, its end will also be embedded in the receiving slot at the same time, so that the two sets of docking blocks 44 will cooperate with the two sets of docking slots 43 and the two sets of receiving slots to restrict and support the three blades of the rotary tillage blade 5.

[0071] Furthermore, corresponding mating holes 46 are provided through the mounting plate 40, mounting box 41 and pad 45. The outer opening of the mating holes 46 is designed to open outwards like a flared mouth, which can reduce the difficulty of the bolts 47 passing through the mating holes 46.

[0072] One end of the bolt 47 is slidably connected to the pad 45, and the other end passes through the mating hole 46 on the pad 45, the mounting box 41 and the mounting plate 40 in sequence, and is located on the outside of the mounting plate 40. A washer 480 is fitted on the end of the bolt 47 located on the outside of the mounting plate 40. One side of the washer 480 is in contact with the outer wall of the mounting plate 40, and the other side is in contact with the hexagonal nut 48 threaded on the end of the bolt 47. The washer 480 can increase the force-bearing area and prevent the outer wall of the mounting plate 40 from being damaged when the hexagonal nut 48 is tightened.

[0073] The resetter 49 is installed inside the mounting box 41 and connected to the side of the pad 45 away from the mating block 44, and is used to provide power for the mating block 44 to move into the mating groove 43.

[0074] Multiple sets of mounting boxes 41 are installed at equal angles on the outer wall of each mounting plate 40, and the mating blocks 44, bolts 47 and resetters 49 installed on each set of mounting boxes 41 are staggered to avoid motion interference between components.

[0075] The main resetter 49 in this embodiment consists of a transmission frame 490, a transmission disc 491, a transmission groove 492, and a spring 493;

[0076] Multiple sets of transmission frames 490 are fixedly installed on the inner wall of the pad 45 away from the docking block 44, and a transmission disc 491 is fixedly installed at the end of each set of transmission frames 490; and a transmission groove 492 corresponding to the position of the transmission disc 491 and the transmission frame 490 is opened inside the mounting box 41, and the transmission frame 490 and the transmission disc 491 can slide along the transmission groove 492.

[0077] Secondly, a spring 493 is fitted on the outer wall of the transmission frame 490. One end of the spring 493 is in contact with the inner wall of the transmission groove 492, and the other end is in contact with the transmission disc 491. When the pad 45 slides outward, the transmission frame 490 will drive the transmission disc 491 to compress the spring 493 to store energy. After it is released, the spring 493 can push the transmission disc 491, the transmission frame 490 and the pad 45 to reset, thereby driving the docking block 44 to insert into the docking groove 43.

[0078] In this embodiment, the nut limiter 6 is used to limit the rotation of the hexagonal nut 48 and ensure that the connection between the bolt 47 and the hexagonal nut 48 is stable. Specifically, it includes a mounting bracket 60, a limiting plate 61 and a limiting block 62.

[0079] Among them, multiple sets of mounting brackets 60 are installed at equal angles on the outer wall of the mounting plate 40 away from the mounting box 41. Each set of mounting brackets 60 includes two symmetrically arranged mounting brackets 60, and the two mounting brackets 60 are located on both sides of the hexagonal nut 48.

[0080] The limiting plate 61 is fixedly installed on the outer wall of the end of the mounting bracket 60 near the hexagonal nut 48. The outer wall of the limiting plate 61 is in contact with the outer wall of the plane of the hexagonal nut 48, and the length of the limiting plate 61 is greater than the length of the outer wall of the plane of the hexagonal nut 48, which can fully restrict the circumferential rotation of the hexagonal nut 48.

[0081] Secondly, the limiting block 62 is installed on the outer wall of the limiting plate 61 near the hexagonal nut 48. Its cross-section is trapezoidal. The inclined surface of the limiting block 62 is not in contact with the outer wall of the hexagonal nut 48 that is in contact with the limiting plate 61, which further enhances the limiting effect on the hexagonal nut 48.

[0082] Meanwhile, the spacing between the mounting brackets 60 is greater than the diameter of the gasket 480, which facilitates the installation and removal of the gasket 480.

[0083] Through the coordinated operation of the above components, when installing the rotary tiller blade 5, the rotary tiller blade 5 is inserted into the blade mounting groove 42. The docking block 44 is inserted into the docking groove 43 under the action of the resetter 49 and pushes the rotary tiller blade 5 so that the positioning block 430 is locked into the positioning groove 431. After the pre-fixation of the rotary tiller blade 5 is completed, the bolt 47 is inserted and the hexagonal nut 48 is fixed by the nut limiter 6. It can be tightened by simply rotating the bolt 47. When disassembling, the bolt 47 is loosened and the rotary tiller blade 5 is pulled to release the limit. With the help of the depth adjustment mechanism 2, the tillage depth can be precisely controlled, which not only solves the problem of cumbersome disassembly and assembly of traditional rotary tiller blades 5, but also ensures the stability of operation and is suitable for the needs of precision agricultural planting.

[0084] When installing the rotary tiller blade 5, first align the rotary tiller blade 5 with the blade mounting groove 42 on the mounting box 41 and push it inward; since the width of the blade mounting groove 42 is greater than the thickness of the top of the rotary tiller blade 5, the rotary tiller blade 5 can easily enter the blade mounting groove 42; as the rotary tiller blade 5 continues to go deeper, the bevel of its top near the docking block 44 contacts the docking block 44, and continuing to push the rotary tiller blade 5 will force the docking block 44 to slide into the movable groove 440 of the mounting box 41, making room for further insertion of the rotary tiller blade 5;

[0085] When the corner of the top of the rotary tiller blade 5 contacts the outer corner of the positioning block 430 on the outer wall of the mounting plate 40, the rotary tiller blade 5 is slightly offset towards the docking block 44 under the guidance of the positioning block 430, and passes smoothly through the positioning block 430; until the top surface of the rotary tiller blade 5 is in contact with the inner wall of the blade mounting groove 42, at which point the docking block 44 corresponds to the docking groove 43 of the rotary tiller blade 5, and the positioning groove 431 of the rotary tiller blade 5 is also aligned with the positioning block 430.

[0086] As the docking block 44 slides into the movable groove 440, the docking block 44 drives the pad 45 to slide synchronously. The pad 45 pulls the transmission plate 491 along the transmission groove 492 of the mounting box 41 towards the spring 493 through the transmission frame 490, so that the spring 493 is compressed and stores energy. When the docking block 44 is aligned with the docking groove 43, the spring 493 releases its elastic force and pulls the pad 45 back to its original position through the transmission plate 491 and the transmission frame 490. During this process, the pad 45 pushes the docking block 44 to insert into the docking groove 43.

[0087] Because the depth of the docking groove 43 is less than the length of the docking block 44 located in the blade mounting groove 42, after the docking block 44 is inserted, it will give the rotary tiller blade 5 a pushing force in the direction of the positioning block 430, causing the rotary tiller blade 5 to move laterally, so that the positioning block 430 enters the positioning groove 431; at this time, the rotary tiller blade 5 is restricted on one side by the plane of the positioning block 430, and on the other side by the cooperation between the docking block 44 and the docking groove 43. When the user hears the impact sound of the docking block 44 and the docking groove 43, the rotary tiller blade 5 has completed the pre-fixation.

[0088] After pre-fixing, place the washer 480 on the outer wall of the mounting plate 40 (this step can be omitted if washer 480 is not required), and then pass the bolt 47 through the mating hole 46 in sequence through the pad 45, mounting box 41, mounting plate 40 and washer 480; then insert the hexagonal nut 48 between the limiting plate 61 and the limiting block 62 of the nut limiter 6. The limiting plate 61 is in contact with the outer wall of the plane of the hexagonal nut 48, and the inclined surface of the limiting block 62 is in contact with the other outer walls of the hexagonal nut 48, thus restricting the angular rotation of the hexagonal nut 48;

[0089] At this point, simply rotate one end of bolt 47 near the pad 45 to thread bolt 47 onto hexagonal nut 48; as bolt 47 is tightened, its end presses against pad 45, further fixing the position of mating block 44 and ensuring that rotary tiller blade 5 is secure and reliable after installation.

[0090] During disassembly, first rotate bolt 47 to separate it from hexagonal nut 48, remove bolt 47 and washer 480, and release the compression restriction of bolt 47 on washer 45;

[0091] Next, gently tap the rotary tiller blade 5 to one side to loosen it, then pull the rotary tiller blade 5 towards the movable groove 440, or pull the pad 45 outward to switch the rotary tiller blade 5 to a state that is in contact with the outer wall of the other side of the blade mounting groove 42. This operation will separate the positioning block 430 from the positioning groove 431.

[0092] Then pull the rotary tiller blade 5 directly downwards. The inclined surface of the docking groove 43 of the rotary tiller blade 5 presses against the inclined angle of the docking block 44, forcing the docking block 44 to slide into the movable groove 440, releasing the restriction on the rotary tiller blade 5. The rotary tiller blade 5 can then be pulled out of the blade mounting groove 42 to complete the disassembly.

[0093] In subsequent use, the rotary tiller is connected to a tractor or other power machinery through the suspension frame 11 and power output mechanism 12 of the machine body 1. The power output mechanism 12 transmits power to the rotary tiller roller 3 through the transmission mechanism 13, driving the rotary tiller roller 3 and rotary tiller blades 5 to rotate at high speed for tillage operations. By adjusting the depth adjustment mechanism 2, the settling depth of the rotary tiller during operation can be changed to achieve precise control of the tillage depth.

[0094] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0095] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0096] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary tiller with adjustable tillage depth, characterized in that: It includes a body, a depth adjustment mechanism and a rotary tiller roller. The rotary tiller roller is equipped with a connecting mechanism and a nut limiter, and the rotary tiller roller is connected to rotary tiller blades through the connecting mechanism. The connecting mechanism includes: The mounting plate has multiple sets of the rotary tiller rollers installed at equal intervals, and the mounting plate has a mounting box that is slidably connected to the rotary tiller blades. A docking groove is formed on the outer wall of the rotary tiller blade. A docking block corresponding to the docking groove is slidably installed on the mounting box, and a pad connected to the docking block is provided on the outer wall of the mounting box. A positioning block is installed on the outer wall of the mounting plate, and the outer wall of the rotary tiller blade is provided with a positioning groove corresponding to the positioning block; A bolt that slides into the pad, with the other end of the bolt located outside the mounting plate, and a hexagonal nut threaded onto the end of the bolt; A resetter, which is installed in the mounting box and connected to the pad, is used to push the mating block into the mating groove; The nut limiter is used to limit the position of the hexagonal nut; the mounting box and the mounting plate are detachably connected, and the mounting box has a blade mounting groove corresponding to the top of the rotary tiller blade, and the width of the blade mounting groove is greater than the thickness of the top of the rotary tiller blade; the mounting box has a movable groove corresponding to the docking block, and the length of the docking block is greater than the thickness of the mounting box, so that the end of the docking block is located inside the blade mounting groove. Two sets of docking blocks are symmetrically installed on the inner wall of the pad, and the thickness of the docking blocks is greater than the width of the docking groove. The inner wall of the mounting box is also provided with a receiving groove that mates with the docking blocks. The end face of the docking groove is designed with an inclined surface corresponding to the docking block, and the depth of the docking groove is less than the length of the docking block in the blade mounting groove. As the docking block moves into the docking groove, it will push the rotary tillage blade towards the positioning block. Multiple sets of positioning blocks are installed at equal angles on the outer wall of the mounting plate. Each set of positioning blocks contains two or more positioning blocks, and the number of positioning blocks in each set is the same. The outer corners of the positioning blocks are beveled. After the positioning blocks enter the positioning groove, the surfaces that come into contact with the positioning groove are all flat, and the thickness of the positioning blocks is less than the gap between the outer wall of the rotary tiller blade and the inner wall of the blade mounting groove. The mounting plate, mounting box, and pad are all provided with through holes corresponding to the bolts, and the outer openings of the through holes are all designed to open outwards to reduce the difficulty of the bolts passing through the through holes. One end of the bolt has its inner wall in contact with the outer wall of the washer, and the other end is fitted with a washer that is in contact with the outer wall of the mounting plate, and the washer is in contact with the inner wall of the hexagonal nut; the nut limiter includes: The mounting brackets are installed in multiple sets at equal angles on the outer wall of the mounting plate on the side away from the mounting box. Each set consists of two mounting brackets, and the two mounting brackets are symmetrically arranged on both sides of the hexagonal nut. The limiting plate is fixedly installed on the outer wall of the end of the mounting bracket near the hexagonal nut, and the outer wall of the limiting plate is in contact with the outer wall of the hexagonal nut that is in a plane, and the length of the limiting plate is greater than the length of the outer wall of the hexagonal nut that is in a plane; The limiting block, which is installed on the outer wall of the limiting plate, is used to further restrict the position of the hexagonal nut.

2. The rotary tiller with adjustable tillage depth according to claim 1, characterized in that: The machine body consists of a frame, a suspension frame, a power output mechanism, and a transmission mechanism; The depth adjustment mechanism consists of an arc-shaped adjustment plate, an adjustment frame, an adjustment box, a connecting shaft, a mating hole, a positioning hole, and a positioning screw; One end of the arc-shaped adjustment plate is rotatably connected to the outer wall of the frame, and the other end is rotatably connected to the adjustment frame. The adjustment frame is slidably connected to the adjustment box, and the outer wall of the adjustment box is fixedly installed with a connecting shaft. The adjustment box is rotatably connected to the outer wall of the frame through the connecting shaft. Multiple sets of positioning holes are equally spaced on the outer wall of the adjustment frame. The outer wall of the adjustment box is provided with a mating hole corresponding to the positioning hole. A positioning screw that is threadedly connected to the positioning hole is slidably installed in the mating hole.

3. A rotary tiller with adjustable tillage depth according to claim 1, characterized in that: The top corner of the rotary tiller blade near the docking block and the top corner of the docking block near the rotary tiller blade are both designed with bevels, and the distance between the bottom and top of the bevel at the top of the rotary tiller blade is greater than the length of the docking block in the blade mounting groove. The docking groove and positioning groove are respectively formed on the outer walls of the two sides of the rotary tiller blade.

4. A rotary tiller with adjustable tillage depth according to claim 1, characterized in that: The resetter consists of a transmission frame, a transmission disc, a transmission groove, and a spring; The transmission frame has multiple sets fixedly installed on the inner wall of the pad, and a transmission disc is installed at the end of the transmission frame. The installation box has a transmission groove corresponding to the transmission disc and the transmission frame, and a spring connected to the transmission groove and the transmission disc is sleeved on the outer wall of the transmission frame. When the pad slides outward, the transmission disc will compress the spring.

5. A rotary tiller with adjustable tillage depth according to claim 1, characterized in that: The mounting box has multiple sets installed at equal angles on the outer wall of the mounting plate, and the mating blocks, bolts and resetters installed on the mounting box are staggered with each other.

6. A rotary tiller with adjustable tillage depth according to claim 1, characterized in that: The limiting block has a trapezoidal cross-section, and the inclined surface of the limiting block and the hexagonal nut are not in contact with the outer wall of the limiting plate. The spacing between the mounting brackets is greater than the diameter of the gasket.

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