A depth limiting device for a small agricultural rotary tillage implement

Abstract

The application discloses a depth-limiting adjusting device for a small agricultural rotary tillage tool and belongs to the field of soil tillage tools. The device comprises a rotary tillage tool main body, a depth-limiting wheel main body arranged on the rotary tillage tool main body, a depth-limiting wheel support movably arranged on the depth-limiting wheel main body, a depth-limiting assembly arranged on the depth-limiting wheel main body, and two depth-limiting nuts sleeved on a depth-limiting screw. The device is provided with an anti-deviation sleeve and a base, so that most of the radial impact load caused by the concave-convex hard soil in the field is borne by the cylindrical sleeve and the block base, and is no longer concentrated on the meshing surface of the small thread of the depth-limiting screw and the depth-limiting nut. Meanwhile, the sleeve and the base have a larger pressure-bearing contact area, can uniformly disperse the vibration stress, avoid the thread teeth from continuously bearing the high-frequency radial shear impact, greatly reduce the probability of thread wear, thread slippage and nut self-loosening, effectively relieve the problems of reciprocating swing of the depth-limiting screw and drift of the tillage depth, and effectively ensure the continuous tillage operation under long-term vibration operation in the farming season.

Description

Technical Field

[0001] This invention relates to the field of soil tillage machinery, and more specifically, to a depth adjustment device for agricultural rotary tillers. Background Technology

[0002] Soil tillage machinery is used for turning, breaking up and preparing soil in the field. Crops are planted in the soil turned out to a certain depth by the rotary tiller. The growth of crops is closely related to the depth of soil turning out. Different crops have different planting depths. Therefore, the depth limit adjustment structure of the rotary tiller itself is of great significance in this regard. The depth adjustment structure of a small agricultural rotary tiller mainly consists of a depth-limiting screw that runs through the machine body and is connected to the depth-limiting wheel bracket via a thread on the surface, and depth-limiting nuts located on the upper and lower sides of the machine body. To adjust the tillage depth of the rotary tiller, simply rotate the upper and lower depth-limiting nuts to release the locking of the depth-limiting screw, and then rotate the depth-limiting screw so that the depth-limiting screw, along with the depth-limiting wheel bracket and the depth-limiting wheel, moves up or down relative to the machine body, thereby adjusting the tillage depth. After the soil in the field is turned up by ridges and plowing, it forms clods. After being sun-dried and air-dried, it forms clods with high hardness. After the field is flooded, some large clods only absorb water and soften on the surface, while the inside remains hard. They are half-buried in the mud layer, causing a lot of protrusions on the field surface. However, the densely distributed half-buried hard clods exacerbate the unevenness of the surface. During operation, these protrusions on the ground cause vibrations in the depth-limiting roller as it rolls, which are then transmitted to the depth-limiting screw and the two depth-limiting nuts. As the vibrations have a radial effect on the depth-limiting screw and the two depth-limiting nuts, the two depth-limiting nuts become loose, causing the depth-limiting screw to be unable to be fixed in place by the two depth-limiting nuts. This results in the depth-limiting screw swinging back and forth, causing the tillage depth to drift. Repeated occurrences of this will cause wear on the threads of the depth-limiting nuts, requiring the machine to be stopped and the two depth-limiting nuts, depth-limiting screw, and depth-limiting roller replaced, which greatly affects the tillage progress during the busy farming season. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of this invention is to provide a depth adjustment device for small agricultural rotary tillers.

[0004] To solve the above problems, the present invention adopts the following technical solution: A depth limiting adjustment device for a small agricultural rotary tiller includes a rotary tiller body, a depth limiting wheel body mounted on the rotary tiller body, a depth limiting wheel bracket movably mounted on the depth limiting wheel body, and a depth limiting component mounted on the depth limiting wheel body. The depth limiting component includes a depth limiting screw that passes through the depth limiting wheel body, with two depth limiting nuts fitted on the depth limiting screw. The two depth limiting nuts are located at the upper and lower ends of the depth limiting wheel body, respectively. An anti-deviation component is located below the depth limiting wheel body to reduce the radial movement of the depth limiting screw. The anti-deviation component includes an anti-deviation sleeve disposed between the depth limiting wheel body and the depth limiting wheel bracket. The anti-deviation sleeve is fitted onto the outer surface of the depth limiting screw, and its inner wall is in contact with the depth limiting screw. The anti-deviation sleeve consists of an upper sleeve and a lower sleeve. A base is fixedly fitted onto the outer surface of the upper sleeve, and one side of the base is in contact with the inner side of the depth limiting wheel body. The base is used to limit the radial movement of the upper sleeve.

[0005] Optionally, the upper sleeve is provided with an inner matching ring that engages with the depth limiting nut. The outer surface of the top of the upper sleeve is polygonal, and the base has a polygonal groove. The base limits the upper sleeve by cooperating with the outer surface of the upper sleeve through the polygonal groove.

[0006] Optionally, an annular groove is provided inside the upper sleeve, and a thrust spring is fixedly installed inside the annular groove. The thrust spring is used to make the upper sleeve and the lower sleeve fit against the surfaces of the depth limiting wheel body and the depth limiting wheel bracket, respectively.

[0007] Optionally, the annular groove inside the upper sleeve extends downward and penetrates the bottom of the lower sleeve, and the top of the lower sleeve is fixedly connected to a limiting slide, with the limiting slide being slidably sealed within the annular groove.

[0008] Optionally, a corrugated pipe is fixedly fitted between the bottom of the outer surface of the upper sleeve and the top of the outer surface of the lower sleeve.

[0009] Optionally, each of the two coaxial depth limiting wheel brackets is equipped with a set of anti-deviation components, and each set of anti-deviation components is connected to a pneumatic component. The pneumatic component is used to simultaneously fill the two sets of anti-deviation sleeves with gas and then work synchronously.

[0010] Optionally, the pneumatic assembly includes an air guide pipe communicating with the annular grooves inside the two sets of upper sleeves. There are two sets of air guide pipes, and a T-shaped pipe is fixedly installed between the two sets of air guide pipes. The two main pipes of the T-shaped pipe are used to connect the two sets of air guide pipes respectively. The branch pipe of the T-shaped pipe is provided with an inner bushing. The upper end of the inner bushing is threaded, and the lower end of the inner bushing is smooth. A manual valve is rotatably installed inside the inner bushing. The manual valve is threaded to the inner bushing through the thread on the inner wall of the inner bushing. A piston head is slidably sealed inside the smooth part of the inner bushing. The piston head is fixedly connected to the manual valve.

[0011] Optionally, an airbag body is fixedly installed inside the three-way tube. The airbag body is used to maintain the stability of the air passage inside the three-way tube. The airbag body is provided with three air inlets, which are used in conjunction with the three ports of the three-way tube. The three air inlets of the airbag body are attached to the wall of the three-way tube. The initial state of the airbag body is an incompletely inflated state. The size of the three air inlets of the airbag body is smaller than the size of the airbag body.

[0012] Optionally, the airbag body is also provided with an inflation / deflation valve, which passes through a three-way tube and has a sealing ring at the contact point with the three-way tube.

[0013] Optionally, each depth limiting wheel bracket is fixedly provided with an embedded tube sleeve, which is slidably fitted on the outer surface of the depth limiting screw. A groove is opened inside the tube sleeve, the size of which is larger than the size of the depth limiting screw. A slip ring is slidably installed inside the groove. A threaded groove is opened on the inner surface of the bottom of the tube sleeve, and an adjusting block is threadedly connected to the inner surface of the bottom of the tube sleeve through the threaded groove.

[0014] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects: In the above scheme, by setting up anti-deviation sleeves and bases, most of the radial impact load from the uneven hard soil in the field is borne by the cylindrical sleeves and block bases, and no longer concentrated on the small thread meshing surface of the depth limiting screw and the depth limiting nut. At the same time, the sleeves and bases have a larger pressure-bearing contact area, which can evenly distribute the vibration stress and avoid the threads from continuously bearing high-frequency radial shear impact. This significantly reduces the probability of thread wear, stripping, and nut loosening, effectively alleviating the problem of reciprocating oscillation of the depth limiting screw and the drift of tillage depth. It effectively ensures the continuous operation of tillage during long-term vibration operation during busy farming seasons. By setting up two sets of anti-deviation sleeve air chambers on the left and right, the air guide pipe and the three-way pipe are connected to the same closed air path. Relying on the connected air pressure, the sleeves on both sides are synchronously driven to extend and retract. A single rotation of the manual valve can realize the synchronous lifting and lowering of the two wheels, eliminating the problem of one side acting alone and the left and right height misalignment. This avoids the defects of the machine tilting and one side of the rotary tiller being too deep and the other side being too shallow. At the same time, it eliminates the working condition of the screw nut on one side bearing the impact of swing, and further reduces the wear of the parts on one side. By setting a manual valve, the piston head is driven by the inner liner thread to linearly squeeze the airbag body, so that the air volume changes to adjust the pressure and depth. After adjustment, the depth is locked by the thread self-locking and the double pressure holding of the sealed air circuit. The entire process does not require disassembly, rotation of the depth limiting screw and depth limiting nut, which greatly simplifies the field depth adjustment steps, saves the adjustment time during busy farming seasons, and improves the efficiency of operation. The sleeve has a sliding ring that can slide freely inside. The bottom of the sleeve is threaded with an adjusting block with a cross groove. When the pneumatic air circuit fails due to leakage and internal gas is lost, the sliding ring falls to the bottom of the groove by its own weight. The operator uses a screwdriver to turn the adjusting block upwards until the top of the adjusting block presses against the sliding ring, locking the sliding freedom of the sliding ring in the groove. This creates a rigid connection between the depth limiting screw, the sleeve, and the depth limiting wheel bracket, switching to the traditional mechanical thread adjustment mode. This allows for temporary field cultivation without disassembling the entire pneumatic modification structure, greatly reducing the impact of air circuit failures on the progress of farming. The anti-slip texture at the bottom of the groove can prevent the adjusting block from rotating and loosening due to field vibrations, ensuring a stable and reliable emergency locking state. Attached Figure Description

[0015] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the area between the two depth-limiting wheel bodies of the present invention; Figure 3 This is a schematic diagram of the structure of the depth-limiting wheel body of the present invention; Figure 4 This is a schematic diagram of a partial structural combination of the depth limiting component and the anti-deviation component of the present invention; Figure 5 This is an exploded view of the depth-limiting component and the anti-deviation component of the present invention; Figure 6 This is an exploded cross-sectional view of the internal structure of the anti-offset sleeve of the present invention; Figure 7 This is a partial structural schematic diagram of the pneumatic component of the present invention; Figure 8 This is a cross-sectional view of the internal structure of the pneumatic component and airbag body of the present invention; Figure 9 This is a cross-sectional view of the internal structure of the emergency adjustment component of the present invention.

[0017] [Figure Labels] 1. Rotary tiller body; 2. Depth limiting wheel body; 3. Depth limiting wheel bracket; 4. Depth limiting component; 5. Anti-deviation component; 6. Pneumatic component; 7. Airbag body; 8. Emergency adjustment component; 41. Depth limiting screw; 42. Depth limiting nut; 51. Anti-deviation sleeve; 52. Base; 53. Bellows; 61. Air guide pipe; 62. T-pipe; 63. Inner bushing; 64. Manual valve; 65. Piston head; 71. Air inlet; 72. Inflation / deceleration valve; 73. Sealing ring; 81. Pipe sleeve; 82. Slip ring; 83. Adjusting block; 511. Upper sleeve; 512. Lower sleeve; 513. Annular groove; 514. Limiting slide; 515. Thrust spring; 516. Inner matching ring; 521. Polygonal groove; 811. Slide groove.

[0018] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0020] like Figures 1 to 9 As shown, this embodiment of the invention provides a depth limiting adjustment device for a small agricultural rotary tiller, including a rotary tiller body 1, a depth limiting wheel body 2 mounted on the rotary tiller body 1, a depth limiting wheel bracket 3 movably mounted on the depth limiting wheel body 2, and a depth limiting component 4 mounted on the depth limiting wheel body 2. The depth limiting component 4 includes a depth limiting screw 41 that passes through the depth limiting wheel body 2, and two depth limiting nuts 42 sleeved on the depth limiting screw 41. The two depth limiting nuts 42 are located at the upper and lower ends of the depth limiting wheel body 2, respectively. An anti-deviation component 5 is provided below the depth limiting wheel body 2 to prevent deviation. The displacement component 5 is used to reduce the radial movement of the depth limiting screw 41. The anti-offset component 5 includes an anti-offset sleeve 51 disposed between the depth limiting wheel body 2 and the depth limiting wheel bracket 3. The anti-offset sleeve 51 is sleeved on the outer surface of the depth limiting screw 41, and the inner wall of the anti-offset sleeve 51 is in contact with the depth limiting screw 41. The anti-offset sleeve 51 is composed of an upper sleeve 511 and a lower sleeve 512. A base 52 is fixedly sleeved on the outer surface of the upper sleeve 511. One side of the base 52 is in contact with the inner side of the depth limiting wheel body 2. The base 52 is used to limit the radial movement of the upper sleeve 511.

[0021] Since the anti-offset sleeve 51 is fitted outside the depth-limiting screw 41, it forms a radial constraint on the depth-limiting screw 41 by relying on the inner wall of the sleeve, limiting the radial displacement of the depth-limiting screw 41 and isolating most of the radial vibration from one side of the depth-limiting wheel from directly acting on the threaded pair of the depth-limiting screw 41. The base 52 is close to the inner side of the depth-limiting wheel body 2, forming a radial limit on the upper sleeve 511, preventing the upper sleeve 511 from rotating circumferentially and moving radially. The sleeve assembly consisting of the upper sleeve 511 and the lower sleeve 512 is arranged between the depth-limiting wheel body 2 and the depth-limiting wheel bracket 3. Under the premise of preserving the original assembly and adjustment functions of the original depth-limiting screw 41 and depth-limiting nut 42, the radial vibration load transmitted from the depth-limiting wheel is borne by the anti-offset sleeve 51, weakening the radial vibration to the depth-limiting screw 41 and depth-limiting nut 42. The transmission of the thread position of the female 42 alleviates the problem of the depth limiting nut 42 rotating and loosening on its own and the depth limiting screw 41 swinging back and forth caused by vibration, reducing the probability of tillage depth drift. At the same time, since the original depth limiting screw 41 and depth limiting nut 42 are replaced by anti-offset sleeve 51 and base 52, and the size of anti-offset sleeve 51 is much larger than that of depth limiting screw 41, radial vibration will be effectively transmitted to depth limiting wheel bracket 3 through base 52 when under force. Compared with the original depth limiting screw 41 and depth limiting nut 42, the service life is improved. It is not easy for the depth limiting screw 41 and depth limiting nut 42 to be damaged by vibration during long-term use. In the case of long-term operation of the machine under vibration during the busy farming season, the need to replace parts will be effectively reduced. It is important to note that in hilly, water-dry rotation fields in the south, the field surface contains depressions, remnants of old ridges, and partially buried hard soil clods. When the depth limiting wheel rolls, it continuously bears the radial impact vibration from the ground. This radial vibration load is directly transmitted to the depth limiting screw 41 through the depth limiting wheel bracket 3, and then from the depth limiting screw 41 to the upper and lower depth limiting nuts 42. The vibration impact repeatedly acts between the threads of the depth limiting screw 41 and the depth limiting nuts 42. The threaded pair has to bear both the axial support load from the whole machine and the high-frequency radial impact load. The threads are repeatedly subjected to shearing and extrusion impacts, which will cause the depth limiting nuts 42 to rotate and loosen on their own. The depth limiting screw 41 will swing back and forth, resulting in a drift in tillage depth. Under long-term vibration during the busy farming season, the threads will wear out and strip quickly, and the machine must be stopped to replace the depth limiting screw 41 and depth limiting nuts 42, which will delay the tillage progress. The anti-deviation sleeve 51 is fitted outside the depth limiting screw 41, between the depth limiting wheel body 2 and the depth limiting wheel bracket 3. The radial impact vibration of the ground generated during field operations is no longer mainly borne by the threaded pair from the depth limiting screw 41 to the depth limiting nut 42. The vibration load is first transmitted from the depth limiting wheel bracket 3 to the lower sleeve 512 of the anti-deviation sleeve 51, and then through the sleeve body to the base 52. The base 52 abuts against the inner wall of the depth limiting wheel body 2, ultimately directly transmitting most of the radial impact load to the depth limiting wheel of the rotary tiller. Body 2, the anti-deviation sleeve 51 is an integral cylindrical component, and the base 52 is a block-shaped pressure-bearing component. Both are solid pressure-bearing structures, and the pressure-bearing contact area is much larger than the meshing contact area of ​​the thread teeth between the depth-limiting screw 41 and the depth-limiting nut 42. The radial impact load can be evenly distributed over a large area. There are no small meshing positions where stress is concentrated, such as the thread teeth. The ability to resist radial impact and shear wear is stronger. Therefore, when subjected to high-frequency radial vibration impact, the anti-deviation sleeve 51 and the base 52 are not prone to wear, cracking and failure. The threaded pair of depth limiting screw 41 and depth limiting nut 42 retains only the original axial locking function and no longer bears a large amount of radial impact load. The thread teeth no longer continuously bear high-frequency radial shear impact. The working conditions of the threaded pair are improved, suppressing the nut from rotating and loosening due to vibration, reducing the risk of thread wear and stripping failure. It can reduce the probability of component damage under long-term vibration operation during busy farming seasons and reduce the need for emergency shutdown to replace parts.

[0022] like Figures 4 to 6 As shown, the upper sleeve 511 has an inner matching ring 516 that rotates inside. The inner matching ring 516 engages with the depth limiting nut 42. The outer surface of the top of the upper sleeve 511 has a polygonal design. The base 52 has a polygonal slot 521. The base 52 limits the upper sleeve 511 by cooperating with the outer surface of the upper sleeve 511 through the polygonal slot 521.

[0023] The base 52 engages with the polygonal outer surface of the upper sleeve 511 via a polygonal slot 521, locking the circumferential rotation of the upper sleeve 511 and preventing the upper sleeve 511 from twisting due to vibration. The inner matching ring 516 can rotate freely inside the upper sleeve 511. The inner matching ring 516 engages with the depth limiting nut 42, which can both absorb the radial vibration transmitted from the depth limiting nut 42 and allow the depth limiting nut 42 to rotate and adjust with the depth limiting screw 41. This achieves the absorption of radial vibration by the structure from the upper sleeve 511 to the base 52, while the original screw nut's thread adjustment function is not interfered with, preventing the vibration torque from being directly transmitted to the depth limiting nut 42 and causing the depth limiting nut 42 to loosen.

[0024] like Figure 2 , Figure 3 and Figure 6As shown, an annular groove 513 is provided inside the upper sleeve 511, and a thrust spring 515 is fixedly installed inside the annular groove 513. The thrust spring 515 is used to make the upper sleeve 511 and the lower sleeve 512 respectively fit against the surface of the depth limiting wheel body 2 and the depth limiting wheel bracket 3.

[0025] The thrust spring 515 is assembled inside the annular groove 513. The two ends of the spring apply axial preload to the upper sleeve 511 and the lower sleeve 512 respectively. Under the condition of machine vibration and impact, the spring preload keeps the upper end of the upper sleeve 511 against the depth limiting wheel body 2 and the lower end of the lower sleeve 512 against the depth limiting wheel bracket 3, eliminating the assembly gap between the two ends of the sleeve and the corresponding parts, avoiding the impact noise and secondary impact wear caused by the gap. At the same time, the spring can absorb part of the axial vibration impact, reduce the impact load directly transmitted to the thread position of the depth limiting screw 41, and ensure that the entire sleeve is always in an effective support state during operation.

[0026] The annular groove 513 inside the upper sleeve 511 extends downward and penetrates the bottom of the lower sleeve 512. The top of the lower sleeve 512 is fixedly connected to the limiting slide 514, and the limiting slide 514 is slidably sealed inside the annular groove 513.

[0027] A corrugated pipe 53 is fixedly sleeved between the bottom of the outer surface of the upper sleeve 511 and the top of the outer surface of the lower sleeve 512.

[0028] When gas is filled into the air chamber, the gas pressure acts on the end face of the limiting slide 514, pushing the limiting slide 514 and the lower sleeve 512 downward relative to the upper sleeve 511. This allows the lower sleeve 512 to push the depth limiting wheel bracket 3 downward, changing the position of the depth limiting wheel bracket 3 relative to the depth limiting wheel body 2. When the air chamber is depressurized, the external load and the force of the thrust spring 515 can drive the limiting slide 514 to retract, causing the lower sleeve 512 to retract. The sliding sealing structure ensures that the gas in the air chamber will not leak from the sleeve mating position. At the same time, the bellows 53 is added to further seal the connection between the upper sleeve 511 and the lower sleeve 512, while isolating this position from contact with the outside world, preventing external dust and soil from entering when the rotary tiller body 1 is working, thus affecting the movement of the upper sleeve 511 and the lower sleeve 512.

[0029] like Figures 6 to 8 As shown, each of the two coaxial depth limiting wheel brackets 3 is equipped with a set of anti-deviation components 5, and each of the two sets of anti-deviation components 5 is connected to a pneumatic component 6. The pneumatic component 6 is used to simultaneously fill the two sets of anti-deviation sleeves 51 with gas and then work synchronously.

[0030] The pneumatic assembly 6 includes an air guide pipe 61 that communicates with the annular groove 513 inside the two sets of upper sleeves 511. There are two sets of air guide pipes 61, and a three-way pipe 62 is fixedly installed between the two sets of air guide pipes 61. The two main pipes of the three-way pipe 62 are used to connect to the two sets of air guide pipes 61 respectively. The branch pipe of the three-way pipe 62 is provided with an inner bushing 63. The upper end of the inner bushing 63 is threaded, and the lower end of the inner bushing 63 is smooth. A manual valve 64 is rotatably installed inside the inner bushing 63. The manual valve 64 is threaded to the inner bushing 63 through the thread on the inner wall of the inner bushing 63. A piston head 65 is slidably sealed inside the smooth part of the inner bushing 63. The piston head 65 is fixedly connected to the manual valve 64.

[0031] An airbag body 7 is fixedly installed inside the three-way tube 62. The airbag body 7 is used to maintain the stability of the air passage inside the three-way tube 62. The airbag body 7 is provided with three air inlets 71, which are used in conjunction with the three ports of the three-way tube 62. The three air inlets 71 of the airbag body 7 are attached to the tube wall of the three-way tube 62. The initial state of the airbag body 7 is an incompletely inflated state. The size of the three air inlets 71 of the airbag body 7 is smaller than the size of the airbag body 7.

[0032] An inflation / deflation valve 72 is also provided on the airbag body 7. The inflation / deflation valve 72 passes through the three-way pipe 62 and a sealing ring 73 is provided at the contact point with the three-way pipe 62.

[0033] Traditional mechanical depth limiting structures have independent left and right wheels, which require manual adjustment separately. This can easily lead to inconsistent adjustment strokes on the left and right sides, or one side being too high or too low. When operating in uneven fields, the height difference between the left and right wheels can cause the machine to tilt. One side of the rotary tiller blade may penetrate the soil too deeply, while the other side may penetrate it too shallowly. This uneven load on the machine body will cause the depth limiting screw 41, depth limiting nut 42, and depth limiting wheel body 2 on one side to bear the entire impact of the sway, which will aggravate the vibration and wear of the depth limiting screw 41 and depth limiting nut 42 on one side. First, after the equipment is properly assembled, the internal air chambers of the two sets of anti-deviation sleeves 51 are fully interconnected through the air guide pipe 61 and the three-way pipe 62, making the two sides of the telescopic air chambers connected into the same sealed air path. When the operator rotates the manual valve 64 to drive the piston head 65 to move down and squeeze the air in the air path, the overall pressure of the sealed air path rises synchronously. The air pressure is simultaneously transmitted to the inside of the left and right sets of anti-deviation sleeves 51, and the two sides of the limiting slide 514 are simultaneously pressed down, driving the two sets of lower sleeves 512 to extend synchronously, and the two sets of depth limiting wheel brackets 3 to move downward synchronously. When the operator rotates the manual valve 64 in the opposite direction, the piston head 65 moves up to release the air path volume, the overall air path pressure drops synchronously, the two sides of the lower sleeves 512 retract synchronously, and the two sets of depth limiting wheel brackets 3 move upward synchronously. The whole machine can complete the synchronous lifting and lowering of the left and right wheels with a single valve adjustment action, reducing the occurrence of the situation where the body of the depth limiting wheel on one side moves alone and the left and right heights are inconsistent, further ensuring the service life of the equipment and reducing the need to replace parts during cultivation. It is important to note that the inner cavity of the airbag body 7 can be further equipped with an elastic support frame to reduce the impact of vibration on the contraction of the two depth-limiting wheel bodies 2. Under normal conditions, the elastic support frame keeps the airbag body 7 in its initial, incompletely inflated state. When gas is introduced into the airbag body 7, the gas pressure overcomes the elasticity of the support frame, causing the airbag body 7 to inflate. When the internal air pressure of the airbag body 7 is higher than the internal air pressure of the two side air ducts 61, the elastic support frame generates a rebound force, assisting in pushing the gas inside the airbag body 7 to flow out through the side air inlets 71, accelerating the return of the airbag body 7 to its initial shape. Furthermore, the upper part of the airbag body 7 is made of butyl rubber, which reduces gas leakage and provides excellent resistance to mud, water, and ozone aging. It can adapt to the diurnal temperature range in the field and the conditions of cross-seasonal open-air storage after autumn harvest. It can withstand the normal operating pressure of the system and the instantaneous pressure fluctuations caused by operational impacts, meeting the cyclic deformation requirements of repeated short-term expansion and subsequent rebound. The elastic support frame, as an alternative to the airbag body 7, is made of 304 stainless steel. The airbag body 7 is made of stainless steel fine spring wire or high elasticity glass fiber reinforced PP plastic skeleton and distributed on the inner surface of the airbag body 7. Secondly, when adjusting the tillage depth, the operator directly rotates the manual valve 64. The manual valve 64 moves axially through the upper thread of the inner sleeve 63, causing the lower piston head 65 to slide vertically and seal within the smooth cavity. As the piston head 65 moves downward, it compresses the air in the sealed air passage, increasing the air pressure and achieving the depth adjustment purpose of the lower sleeve 512 (in principle, the upper sleeve 511). As the piston head 65 moves upward, the air pressure decreases. Due to the weight of the rotary tiller body 1, the lower sleeve 512 moves closer to the upper sleeve 511, resulting in the sleeve retracting and reducing the tillage depth. The entire adjustment process does not require rotating the depth limiting screw 41 or tightening and loosening the upper and lower depth limiting nuts 42. After the adjustment is completed, the current position is locked by the self-locking of the thread and the pressure of the sealed air circuit, thus completing the tillage depth adjustment operation. Compared with the traditional method of repeatedly turning the two depth limiting nuts 42 to loosen the depth limiting screw 41, then turning the depth limiting screw 41 to set the depth, and finally turning the depth limiting nuts 42 to fix the depth limiting screw 41, the depth adjustment purpose can be achieved simply by adjusting the manual valve 64. The operation is simpler and more convenient, and the depth adjustment time is reduced, which is of great significance during the busy farming season. Furthermore, due to the planting seasons in the south—wheat in spring and summer, rice in summer and harvest in autumn—especially during the transition from spring to summer, there are large temperature differences between day and night. When the equipment is operating in the field, the daytime ambient temperature rises, causing the gas inside the sealed air passage to expand due to heat, passively increasing the system pressure. Operators can use the inflation / deflation valve 72 to release a small amount of internal gas, restoring the air passage pressure to the standard working pressure. At night, the temperature drops, causing the gas in the air passage to contract and decrease in pressure. Gas can be added using the inflation / deflation valve 72 to restore the working pressure. After the autumn harvest, if the equipment needs to be used again the following spring and requires long-term storage, the internal pressure of the air passage should be completely released using the inflation / deflation valve 72, allowing the airbag body 7 to... The anti-deviation sleeve 51 is loosened and stored. Before the spring plowing operation the following year, the system pressure is recalibrated by replenishing air through the inflation / deflation valve 72, and the equipment returns to normal pneumatic regulation operation. After depressurization, the airbag body 7 contracts, eliminating the continuous tensile stress of the rubber parts and reducing the possibility of permanent deformation of the airbag body 7. The airbag body 7 itself or the internal elastic support skeleton is relieved of the compression load, reducing the possibility of plastic deformation of the skeleton. The sealing part of the anti-deviation sleeve 51 is also freed from continuous air pressure pre-tightening, slowing down the aging of the seal. Before the spring plowing operation the following year, the system pressure is recalibrated by replenishing air through the inflation / deflation valve 72, and the equipment returns to normal pneumatic regulation operation. Furthermore, under normal operating conditions, the airbag body 7 maintains its initial, incompletely inflated shape thanks to its own elasticity or the elastic support frame. The airbag body 7 is in a standby, unloaded state. When the operator rotates the manual valve 64 to press down the piston head 65, gas enters the three-way cavity through the branch pipe of the three-way pipe 62, and then slowly enters the airbag body 7 through three small-diameter air inlets 71. Because the flow orifice of the air inlets 71 is small, the speed at which the gas enters the airbag body 7 is greater than the speed at which the gas is diverted to the two side pipes. The gas accumulates inside the airbag body 7, and the internal pressure of the airbag body 7 increases. Overcoming its own elasticity or the elasticity of the support frame, the airbag body 7 expands and accumulates pressure. When the internal pressure of the airbag body 7 is higher than the pressure of the two side air guide pipes 61... When compressed, the spring rebounds and contracts due to its own elasticity or the elastic support frame, actively squeezing the gas inside the airbag cavity. This causes the gas inside the airbag body 7 to flow evenly and slowly into the left and right air guide pipes 61. After the pressure of the entire air path is balanced, the airbag completely returns to its initial uninflated state. When encountering a ground protrusion during field operations, the depth limiting wheel on one side is compressed and squeezes the air chamber of the sleeve on one side, generating instantaneous high pressure. Because the diameter of the air inlet 71 is smaller than that of the airbag cavity, a throttling damping effect is formed. The instantaneous high pressure gas on one side cannot quickly rush into the airbag and flow to the sleeve on the other side. The airbag cavity temporarily absorbs the pressure fluctuation and slowly and evenly releases the pressure through the frame, keeping the air pressure of the two pipelines relatively stable throughout the process, reducing the occurrence of height misalignment of the depth limiting wheel caused by rapid exchange of air pressure at both ends.

[0034] like Figure 9 As shown, each depth limiting wheel bracket 3 is fixedly provided with an embedded tube sleeve 81. The tube sleeve 81 is slidably sleeved on the outer surface of the depth limiting screw 41. The tube sleeve 81 has a sliding groove 811 inside. The size of the sliding groove 811 is larger than the size of the depth limiting screw 41. A sliding ring 82 is slidably disposed inside the sliding groove 811. The inner surface of the bottom of the tube sleeve 81 has a threaded groove. The inner surface of the bottom of the tube sleeve 81 is threadedly connected to the adjusting block 83 through the threaded groove.

[0035] When the rotary tiller body 1 works in a relatively uneven working environment for a long time, and the pneumatic air circuit fails and the gas is lost, the slip ring 82 falls to the lower end of the slide groove 811 under its own weight. At this time, rotate the adjusting block 83 until it can no longer be rotated. At this time, due to the failure of the starting air circuit, one person can press down the upper sleeve 511 by hand or pressing tool so that the upper sleeve 511 is fully in contact with the lower sleeve 512. Due to the weight of the base 52 itself, it will move down with the upper sleeve 511, exposing the original depth limiting nut 42 that was originally located below. At this time, it is only necessary to adjust according to the traditional depth limiting component 4 of the rotary tiller body 1. After the tillage is completed, the starting air circuit can be replaced. The traditional depth adjustment method can still ensure the normal use of the depth limiting component 4 as a temporary method, and has minimal impact on the tillage time. After the cultivation is completed, when the air circuit needs to be replaced, first check whether the corrugated pipe 53 is damaged or leaking. If so, the entire upper sleeve 511 and lower sleeve 512 need to be replaced. If not, just check whether the connection between the upper sleeve and the air guide pipe 61 is damaged. If so, the air guide pipe 61 needs to be replaced directly or the part needs to be sealed. If not, just replace the three-way pipe 62 with the airbag body 7. The replacement method is simple and the replacement parts are fixed, which makes it easy to check for problems later. It should be noted that the adjusting block 83 is cylindrical and long enough. The bottom of the adjusting block 83 has a cross-shaped groove for inserting a screwdriver. The size of the adjusting block 83 is smaller than the size of the slide groove 811. The bottom of the slide groove 811 has anti-slip texture. When using the emergency adjustment component 8, the adjusting block 83 at the bottom is turned with a screwdriver, causing the adjusting block 83 to rotate through the threaded groove and move upward, gradually approaching the bottom of the depth limiting screw 41. This gradually reduces the space of the slide groove 811 until the top of the adjusting block 83 completely presses against the slip ring 82, making the slip ring 82 unable to move. This indicates that the emergency adjustment component 8 has been adjusted. The entire sleeve 81 passes through the depth limiting wheel bracket 3, making it easy to rotate the adjusting block 83 from below the depth limiting wheel bracket 3.

[0036] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0037] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0038] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0039] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A depth limiting adjustment device for a small agricultural rotary tiller, comprising a rotary tiller body (1), a depth limiting wheel body (2) disposed on the rotary tiller body (1), a depth limiting wheel bracket (3) movably disposed on the depth limiting wheel body (2), and a depth limiting component (4) disposed on the depth limiting wheel body (2), the depth limiting component (4) comprising a depth limiting screw (41) passing through the depth limiting wheel body (2), two depth limiting nuts (42) sleeved on the depth limiting screw (41), the two depth limiting nuts (42) being located at the upper and lower ends of the depth limiting wheel body (2) respectively, characterized in that: An anti-offset component (5) is provided below the depth limiting wheel body (2). The anti-offset component (5) is used to reduce the radial movement of the depth limiting screw (41). The anti-offset component (5) includes an anti-offset sleeve (51) disposed between the depth limiting wheel body (2) and the depth limiting wheel bracket (3). The anti-deviation sleeve (51) is sleeved on the outer surface of the depth limiting screw (41), and the inner wall of the anti-deviation sleeve (51) is in contact with the depth limiting screw (41). The anti-deviation sleeve (51) is composed of an upper sleeve (511) and a lower sleeve (512). A base (52) is fixedly sleeved on the outer surface of the upper sleeve (511). One side of the base (52) is in contact with the inner side of the depth limiting wheel body (2). The base (52) is used to limit the radial movement of the upper sleeve (511).

2. The depth-limiting adjustment device for small agricultural rotary tillers according to claim 1, characterized in that, The upper sleeve (511) is provided with an inner matching ring (516) that rotates inside. The inner matching ring (516) engages with the depth limiting nut (42). The outer surface of the top of the upper sleeve (511) is polygonal. The base (52) has a polygonal slot (521) and the base (52) limits the upper sleeve (511) by cooperating with the outer surface of the upper sleeve (511) through the polygonal slot (521).

3. The depth limiting adjustment device for small agricultural rotary tillers according to claim 2, characterized in that, The upper sleeve (511) has an annular groove (513) inside, and a thrust spring (515) is fixedly installed inside the annular groove (513). The thrust spring (515) is used to make the upper sleeve (511) and the lower sleeve (512) fit against the surfaces of the depth limiting wheel body (2) and the depth limiting wheel bracket (3), respectively.

4. The depth limiting adjustment device for small agricultural rotary tillers according to claim 3, characterized in that, The annular groove (513) inside the upper sleeve (511) extends downward and penetrates the bottom of the lower sleeve (512). The top of the lower sleeve (512) is fixedly connected to the limiting slide (514), and the limiting slide (514) is slidably sealed inside the annular groove (513).

5. The depth limiting adjustment device for small agricultural rotary tillers according to claim 4, characterized in that, A corrugated pipe (53) is fixedly sleeved between the bottom of the outer surface of the upper sleeve (511) and the top of the outer surface of the lower sleeve (512).

6. The depth-limiting adjustment device for small agricultural rotary tillers according to claim 5, characterized in that, Each of the two coaxial depth-limiting wheel brackets (3) is provided with a set of anti-deviation components (5), and each of the two sets of anti-deviation components (5) is connected to a pneumatic component (6). The pneumatic component (6) is used to simultaneously fill gas into the two sets of anti-deviation sleeves (51) and then work synchronously.

7. The depth limiting adjustment device for small agricultural rotary tillers according to claim 6, characterized in that, The pneumatic assembly (6) includes an air guide pipe (61) that communicates with the annular groove (513) inside the two sets of upper sleeves (511). There are two sets of air guide pipes (61). A three-way pipe (62) is fixedly arranged between the two sets of air guide pipes (61). The two main pipes of the three-way pipe (62) are used to connect the two sets of air guide pipes (61) respectively. An inner bushing (63) is provided inside the branch pipe of the three-way pipe (62). The upper end of the inner bushing (63) is threaded, and the lower end of the inner bushing (63) is smooth. A manual valve (64) is rotatably arranged inside the inner bushing (63). The manual valve (64) is threaded to the inner bushing (63) through the thread on the inner wall of the inner bushing (63). A piston head (65) is slidably sealed inside the smooth part of the inner bushing (63). The piston head (65) is fixedly connected to the manual valve (64).

8. The depth limiting adjustment device for small agricultural rotary tillers according to claim 7, characterized in that, An airbag body (7) is fixedly installed inside the three-way tube (62). The airbag body (7) is used to maintain the stability of the air passage inside the three-way tube (62). The airbag body (7) is provided with three air inlets (71). The three air inlets (71) are used in conjunction with the three ports of the three-way tube (62). The three air inlets (71) of the airbag body (7) are attached to the wall of the three-way tube (62). The airbag body (7) is initially in a state of incomplete inflation. The size of the three air inlets (71) of the airbag body (7) is smaller than the size of the airbag body (7).

9. The depth limiting adjustment device for small agricultural rotary tillers according to claim 8, characterized in that, The airbag body (7) is also provided with an inflation / deflation valve (72), which passes through a three-way pipe (62) and has a sealing ring (73) at the contact point with the three-way pipe (62).

10. The depth-limiting adjustment device for small agricultural rotary tillers according to claim 9, characterized in that, Each depth limiting wheel bracket (3) is fixedly provided with an embedded tube sleeve (81). The tube sleeve (81) is slidably sleeved on the outer surface of the depth limiting screw (41). The tube sleeve (81) has a sliding groove (811) inside. The size of the sliding groove (811) is larger than the size of the depth limiting screw (41). A slip ring (82) is slidably disposed inside the sliding groove (811). The slip ring (82) is slidably disposed in the sliding groove (811). A threaded groove is provided on the inner surface of the bottom of the tube sleeve (81). The inner surface of the bottom of the tube sleeve (81) is threadedly connected to the adjusting block (83) through the threaded groove.

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