Sand plowing harrow

Abstract

The embodiment of the utility model provides a sand plowing harrow. In one specific embodiment, the sand plowing harrow comprises a harrow frame and at least two harrow groups fixed on the harrow frame, the harrow set comprises a sliding part, a distance adjusting mechanism and a fixing mechanism. According to the implementation mode, the drive assembly directly drives the disk blade assemblies to move in the opposite directions or in the back-to-back directions, the mechanism that deformation of the distance adjusting mechanism is converted into transmission is combined, and single-operation continuous adjustment of the distance of the whole set of disk blades is achieved. The working efficiency is effectively improved; in addition, the distance adjusting mechanism deforms under the action of driving force at the two ends, and all the disk blade assemblies in the middle are forced to synchronously move at equal intervals under evenly-distributed stress. Compared with a traditional manual pushing mode, errors are reduced, the fixed integral multiple adjustment limitation of a traditional bolt groove is broken through, stepless setting of any interval value is supported, and the problem that the water content of crushed soil is suddenly changed due to discrete adjustment is solved.

Description

Technical Field

[0001] This disclosure relates to the field of plowing harrows. More specifically, it relates to a plowing harrow for sandy land. Background Technology

[0002] Sandy land cultivation is a core aspect of dryland agriculture. Sandy soils, due to their loose, porous structure and poor water retention, place particularly stringent demands on the soil-breaking and homogenizing effects of plowing and harrowing. While traditional fixed-spacing plows and harrows can accomplish basic soil-breaking tasks, their fixed blade spacing makes them unsuitable for the diverse planting patterns required for crops in sandy areas. For example, potato planting requires a narrow 20cm spacing to refine the seedbed, while corn cultivation requires a wide 35cm spacing to avoid root damage. Existing equipment often necessitates replacing the entire set of harrow blades, resulting in low operational efficiency.

[0003] Existing adjustable rakes mainly achieve spacing changes through discrete adjustments, typically using a pin-positioning groove structure. While this allows for coarse adjustments at fixed intervals, it suffers from two major technical bottlenecks:

[0004] First, it is necessary to loosen the positioning bolts one by one and manually push the rake blade assembly, which is time-consuming and manual pushing is prone to displacement deviation.

[0005] Secondly, the fixed interval design of the pin slot means that the spacing can only be adjusted according to an integer multiple of the preset slot hole diameter spacing, which cannot meet the high precision spacing requirements. Especially in sandy soil moisture retention operations, if the deviation of the tillage spacing reaches 5cm, the difference in soil moisture content is very large.

[0006] The aforementioned technical deficiencies severely restrict the mechanization of agriculture in sandy areas. There is an urgent need for a plowing harrow with continuous stepless adjustment capabilities and the ability to ensure synchronous and equidistant displacement of multiple harrow blade groups, so as to fundamentally solve the core pain points of low efficiency and poor precision of existing equipment. Summary of the Invention

[0007] The purpose of this disclosure is to provide a sand plow rake to solve at least one of the problems of low efficiency in manually adjusting the spacing of the rake blades, poor synchronization leading to displacement deviation, and low adjustment accuracy in the prior art.

[0008] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0009] The first aspect of this disclosure provides a sand plow rake, comprising:

[0010] Rake frame;

[0011] At least two rake sets are fixed to the rake frame;

[0012] The rake assembly includes a sliding part, a spacing adjustment mechanism, and a fixing mechanism;

[0013] The sliding part is fixedly connected to the rake frame via the fixing mechanism; multiple rake blade assemblies are slidably connected to the sliding part on the side away from the rake frame;

[0014] The spacing adjustment mechanism is fixedly connected to the rake blade assembly;

[0015] A drive component is provided on the sliding part;

[0016] The output end of the drive component is fixedly connected to the rake blade assembly at the end, so that the output end of the drive component drives the rake blade assemblies at both ends to slide in opposite directions or backwards along the sliding part, forcing the spacing adjustment mechanism to deform, so that the spacing adjustment mechanism drives all the intermediate rake blade assemblies to move synchronously and equidistantly, so that the spacing between adjacent rake blade assemblies is proportionally enlarged or reduced.

[0017] Furthermore, the rake assembly includes circular rake blades, a connecting plate, a slider, and a shock absorber;

[0018] One end of the connecting plate is rotatably connected to the circular rake blade, and the other end is fixedly connected to one end of the shock absorber;

[0019] The other end of the shock absorber is fixedly connected to the slider;

[0020] The sliding part is slidably connected to the slider.

[0021] Furthermore, the connecting plate is an arc-shaped connecting plate, and the opening direction of the arc-shaped connecting plate is consistent with the forward direction of the circular rake blade.

[0022] Furthermore, the angle between the curvature direction of the arc-shaped connecting plate and the rotation plane of the rake blade is in the range of 15°-30°.

[0023] Furthermore, the shock absorber is selected from one of the following: an air-filled shock absorber, a spring-damped shock absorber, a hydraulic shock absorber, and a rubber shock absorber.

[0024] Furthermore, the spacing adjustment mechanism includes:

[0025] An end scissor arm is provided on the end of the rake blade assembly, and a middle scissor arm is provided on each of the middle rake blade assemblies.

[0026] The end scissor arm includes a first arm, a second arm, and a first hinge shaft. One end of the first arm and one end of the second arm are hinged together by the first hinge shaft, and the first hinge shaft is fixedly connected to the rake blade assembly at the end.

[0027] The middle scissor arm includes a third arm and a fourth arm, and a second hinge shaft. The middle parts of the third arm and the fourth arm are cross-hinged by the second hinge shaft. The second hinge shaft is fixedly connected to the rake blade assembly located in the middle.

[0028] The end of the third arm between two adjacent middle scissor arms is hinged, and the end of the fourth arm is hinged.

[0029] The other end of the first arm of the end scissor arm is hinged to the end of the third arm of the adjacent middle scissor arm; the other end of the second arm is hinged to the end of the fourth arm of the adjacent middle scissor arm.

[0030] The drive assembly drives the end scissor arms to move linearly through the rake blade assembly at the end, forcing the first and second arms of the end scissor arms to expand or retract around the first hinge axis, thereby driving the third and fourth arms of each middle scissor arm to expand or retract around the second hinge axis; thereby driving all rake blade assemblies to move synchronously and equidistantly, so that the distance between adjacent rake blade assemblies is proportionally enlarged or reduced.

[0031] Furthermore, the drive assembly includes a telescopic cylinder disposed opposite to the sliding portion;

[0032] The telescopic cylinder has a transmission unit fixed to its telescopic end;

[0033] The transmission unit is fixedly connected to the rake blade assembly at its end.

[0034] Furthermore, the rake frame includes a traction bracket, a first bracket, and a second bracket;

[0035] The sliding part is fixedly connected to the first bracket through the fixing mechanism;

[0036] One end of the second bracket is fixedly connected to the traction bracket, and the other end is hinged to the sliding part of a rake assembly.

[0037] Furthermore, a leveling wheel is fixedly connected to the first support on the side opposite to the direction of movement of the sand plow and harrow.

[0038] Furthermore, the fixing mechanism includes two fixing plates fixed in parallel to the sliding part and at least two bolts;

[0039] The first bracket has a first through hole for engaging with the bolt;

[0040] The fixed plate is provided with through hole groups corresponding to the first through hole in a matrix arrangement, and the through hole groups include at least 2 rows and at least 2 columns of second through holes;

[0041] The bolts pass through the first through hole and the corresponding second through hole respectively to clamp and fix the first bracket between the two fixing plates.

[0042] The beneficial effects of this disclosure are as follows:

[0043] This disclosure achieves continuous adjustment of the spacing between all rake blades in a single operation by directly driving the rake blade assembly to move in opposite directions using a drive component, combined with the deformation transformation of the spacing adjustment mechanism into a transmission mechanism. Compared with traditional manual adjustment group by group, the adjustment time is reduced to less than 2 minutes, significantly improving efficiency. Furthermore, it eliminates the need to replace the entire rake blade assembly, avoiding work interruptions caused by component replacement and effectively improving work efficiency.

[0044] The spacing adjustment mechanism deforms under the driving force at both ends, forcing all the rake blades in the middle to move synchronously and at equal intervals under uniform stress. Compared with the traditional manual pushing method, this reduces errors and ensures a high degree of homogenization of soil breaking depth and moisture content in sandy areas, meeting the agronomic precision requirements for tasks such as potato planting (20cm spacing) and corn cultivation (35cm spacing).

[0045] Breaking through the limitations of traditional pin slots that allow for fixed integer multiple adjustments, this design supports stepless setting of arbitrary spacing values. It significantly improves the root development environment for crops and solves the problem of abrupt changes in soil moisture content caused by discrete adjustments. Attached Figure Description

[0046] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0047] Figure 1 A schematic diagram of the overall structure of the sand plow and harrow of this disclosure is shown.

[0048] Figure 2 A schematic diagram of the rake assembly of this disclosure is shown.

[0049] Figure 3 A schematic diagram of the rake assembly of this disclosure is shown.

[0050] Figure 4 A schematic diagram of the spacing adjustment mechanism of this disclosure is shown.

[0051] Figure 5 A schematic diagram of the rake frame of this disclosure is shown.

[0052] Figure 6 A schematic diagram of the fixing mechanism of this disclosure is shown.

[0053] Explanation of icon numbers:

[0054] 1. Harrow assembly;

[0055] 11. Rake blade assembly; 111. Circular rake blade; 112. Connecting plate; 113. Slider; 114. Shock absorber;

[0056] 12. Fixing mechanism; 121. Fixing plate; 122. Second through hole;

[0057] 13. Transmission unit;

[0058] 14. Telescopic cylinder;

[0059] 15. Sliding part;

[0060] 16. Spacing adjustment mechanism; 161. First arm; 162. Second arm; 163. Third arm; 164. Fourth arm; 165. First hinge shaft; 166. Second hinge shaft;

[0061] 2. Rake frame; 21. Traction frame; 22. First support; 221. First through hole; 23. Second support;

[0062] 3. Leveling wheel. Detailed Implementation

[0063] To more clearly illustrate this disclosure, the following description, in conjunction with embodiments and accompanying drawings, provides further insight. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this disclosure.

[0064] like Figure 1 and Figure 2 As shown, one embodiment of this disclosure provides a sand plowing harrow, comprising:

[0065] Frame 2;

[0066] At least two rake assemblies 1 are fixed on the rake frame 2;

[0067] The rake assembly 1 includes a sliding part 15, a spacing adjustment mechanism 16, and a fixing mechanism 12;

[0068] The sliding part 15 is fixedly connected to the rake frame 2 via the fixing mechanism 12; multiple rake blade assemblies 11 are slidably connected to the sliding part 15 on the side away from the rake frame 2;

[0069] The spacing adjustment mechanism 16 is fixedly connected to the rake blade assembly 11;

[0070] A drive assembly is provided on the sliding part 15;

[0071] The output end of the drive component is fixedly connected to the rake blade assembly 11 at the end, so that the output end of the drive component drives the rake blade assemblies 11 at both ends to slide in opposite directions or backward along the sliding part 15, forcing the spacing adjustment mechanism 16 to deform, so that the spacing adjustment mechanism 16 drives all the intermediate rake blade assemblies 11 to move synchronously and equally, so that the spacing between adjacent rake blade assemblies 11 is proportionally enlarged or reduced.

[0072] It should be noted that in this embodiment, the sliding part 15 can be a slide rail or a sliding rod, and no further restrictions are imposed here.

[0073] In a preferred embodiment, to ensure the durability of the sand plow rake, the spacing adjustment mechanism 16 and the sliding part 15 need to be sealed. The sealing method can be a labyrinth sealing structure, that is, a non-contact multi-stage baffle structure, which uses airflow to block sand and dust. The gap of the labyrinth seal is controlled at 0.1-0.3mm, and with the addition of grease filling, the dustproof effect is enhanced.

[0074] It should be noted that, in order to adapt to the sandy environment of this disclosure, the sand plow rake in this embodiment should be a heavy-duty sand plow rake. Specifically, the rake blades are 16mm thick and 320mm long, forged from tempered boron steel, and some can be tungsten-plated to extend their service life. It adopts double-row spherical roller bearings, which have high load-bearing capacity and self-leveling ability, and are suitable for stony sandy areas. The weight of the whole machine is between 1545kg and 2000kg, and it is compatible with tractors of 300-450 horsepower. The working width is 120cm-450cm.

[0075] This disclosure achieves continuous adjustment of the spacing between all rake blades in a single operation by directly driving the rake blade assembly 11 to move in opposite directions or back directions using a drive component, combined with the deformation transformation of the spacing adjustment mechanism 16 as a transmission mechanism. Compared with traditional manual adjustment group by group, the adjustment time is shortened to less than 2 minutes, significantly improving efficiency. Furthermore, it eliminates the need to replace the entire rake blade assembly, avoiding work interruptions caused by component replacement and effectively improving work efficiency.

[0076] The spacing adjustment mechanism 16 deforms under the driving force at both ends, forcing all the rake blade assemblies 11 in the middle to move synchronously and at equal intervals under uniform stress. Compared with the traditional manual pushing method, this reduces errors and ensures a high degree of homogenization of soil breaking depth and moisture content in sandy areas, meeting the agronomic precision requirements for tasks such as potato planting (20cm spacing) and corn cultivation (35cm spacing).

[0077] Breaking through the limitations of traditional pin slots that allow for fixed integer multiple adjustments, this design supports stepless setting of arbitrary spacing values. It significantly improves the root development environment for crops and solves the problem of abrupt changes in soil moisture content caused by discrete adjustments.

[0078] In one possible implementation, such as Figure 3As shown, the rake assembly 11 includes a circular rake blade 111, a connecting plate 112, a slider 113, and a shock absorber 114;

[0079] One end of the connecting plate 112 is rotatably connected to the circular rake blade 111, and the other end is fixedly connected to one end of the shock absorber 114;

[0080] The other end of the shock absorber 114 is fixedly connected to the slider 113;

[0081] The sliding part 15 is slidably connected to the slider 113.

[0082] In this embodiment, firstly, each harrow blade assembly 11 is equipped with an individual buffer device. In sandy land plowing harrows, by providing an individual buffer device (such as a spring, hydraulic, or rubber damper) for each harrow blade, compared to the traditional integrated buffer design, when each harrow blade encounters a rock or hard soil clod, the independent buffer device only acts on that blade, causing it to lift briefly (preferably, the maximum displacement range of the shock absorber 114 is 3cm-5cm), while the other blades maintain their normal operating position. This design avoids the problem of cascading lift caused by integrated buffering, ensures consistent tillage depth, and effectively reduces the range of tillage fluctuations.

[0083] Independent buffers can absorb impact energy, significantly reducing the force transmitted to the support, thereby significantly reducing fatigue damage to key components and extending the life of each structure.

[0084] Secondly, in sandy and rocky areas, the independent buffer device allows a single harrow blade to adapt to the terrain undulations, reducing the rate of missed harrowing, and is especially suitable for extreme working conditions such as gravelly sandy areas in Xinjiang.

[0085] Independent buffering confines the impact load to a single rake blade unit, significantly reducing stress at the root of the rake blade and greatly reducing the risk of breakage.

[0086] Finally, if a single buffer unit fails, only that unit needs to be replaced, without the need for a complete machine shutdown for maintenance, thus avoiding the high maintenance costs caused by traditional overall buffer failures.

[0087] In one possible implementation, the connecting plate 112 is an arc-shaped connecting plate, and the opening direction of the arc-shaped connecting plate is consistent with the forward direction of the circular rake blade 111.

[0088] In this embodiment, the opening direction of the arc-shaped connecting plate is the same as the forward direction, so that when the soil reaction force acts on the arc surface, the resulting bending moment is effectively resisted by the circumferential stiffness of the arc, avoiding cracking of the root weld. The connecting plate 112 has no right-angle bends and the opening direction is consistent with the forward direction, so that foreign objects such as weeds and stubble slide and detach along the arc surface, and cannot accumulate in the gap between the connecting plate 112 and the rake blade.

[0089] In one possible implementation, the angle between the curvature direction of the arc-shaped connecting plate and the plane of rotation of the rake blade is in the range of 15°-30°.

[0090] The 15°-30° angle decomposes the soil reaction force into a tangential component (65%-80%) and a normal component (20%-35%), effectively reducing stress concentration at the roots. Furthermore, the 15°-30° angle creates a progressive flow channel between the arc-shaped connecting plate and the rotating plane of the rake blades, allowing the soil to naturally flow along the arc surface, reducing backflow and accumulation, and lowering traction resistance.

[0091] In this embodiment, as a preferred implementation, an included angle of 15°-20° is suitable for heavy clay soils or deep harrowing operations (8-12cm), which improves soil penetration performance by enhancing the tangential component force.

[0092] 25°-30°: Suitable for shallow tillage (5-8cm) in light sandy soil, using the normal component force to suppress soil structure damage caused by excessive deep tillage.

[0093] In one possible implementation, the shock absorber 114 is selected from an air-filled shock absorber, a spring-damped shock absorber, a hydraulic shock absorber, and a rubber shock absorber.

[0094] In one possible implementation, such as Figure 4 As shown, the spacing adjustment mechanism 16 includes:

[0095] An end scissor arm is provided on the end of the rake blade assembly 11, and a middle scissor arm is provided on each of the middle rake blade assemblies 11.

[0096] The end scissor arm includes a first arm 161, a second arm 162, and a first hinge shaft 165. One end of the first arm 161 and one end of the second arm 162 are hinged together by the first hinge shaft 165. The first hinge shaft 165 is fixedly connected to the rake assembly 11 at the end.

[0097] The middle scissor arm includes a third arm 163 and a fourth arm 164, and a second hinge shaft 166. The middle parts of the third arm 163 and the fourth arm 164 are cross-hinged by the second hinge shaft 166. The second hinge shaft 166 is fixedly connected to the rake assembly 11 located in the middle.

[0098] The end of the third arm 163 between two adjacent middle scissor arms is hinged, and the end of the fourth arm 164 is hinged.

[0099] The other end of the first arm 161 of the end scissor arm is hinged to the end of the third arm 163 of the adjacent middle scissor arm; the other end of the second arm 162 is hinged to the end of the fourth arm 164 of the adjacent middle scissor arm.

[0100] The drive assembly drives the end scissor arms to move linearly via the rake blade assembly 11 at the end, forcing the first arm 161 and the second arm 162 of the end scissor arms to expand or retract around the first hinge axis 165, thereby driving the third arm 163 and the fourth arm 164 of each middle scissor arm to expand or retract around the second hinge axis 166; thereby driving all rake blade assemblies 11 to move synchronously and equidistantly, so that the distance between adjacent rake blade assemblies 11 is proportionally enlarged or reduced.

[0101] In one possible implementation, the drive assembly includes a telescopic cylinder 14 disposed relative to the sliding portion 15;

[0102] The telescopic cylinder 14 has a transmission part 13 fixed to its telescopic end;

[0103] The transmission unit 13 is fixedly connected to the rake blade assembly 11 at its end.

[0104] In this embodiment, the telescopic bar is preferably a hydraulic telescopic cylinder 14, whose inner wall is hard chrome plated (thickness ≥ 25 μm) with a surface hardness ≥ 65 HRC, adaptable to sandy abrasion environments. The piston rod is made of high-strength alloy steel (tensile strength ≥ 800 MPa) and equipped with a buffer device (such as a hydraulic buffer pad) to absorb instantaneous impact force (peak value ≤ 10 kN). A double-layer sealing ring (NBR and PTFE materials) is used, achieving a dust and sand protection rating of IP67 to ensure no sand particles intrude into the cylinder.

[0105] In this embodiment, the telescopic bars are symmetrically arranged on the sliding part 15. Through the symmetrical layout (relative arrangement) of the telescopic cylinder 14, the rake blades at both ends can slide synchronously towards or away from each other, avoiding the problem of uneven load caused by uneven force on one side and improving the overall stability.

[0106] In a preferred embodiment, the connection between the transmission unit 13 and the rake blade assembly 11 can be designed as a ball joint or a universal coupling (not shown in the figure), allowing the rake blade to swing ±5° in the vertical direction, avoiding jamming problems caused by sand undulations.

[0107] In a preferred embodiment, the telescopic boom is equipped with a displacement sensor (such as a magnetic scale or encoder) to monitor the stroke of the telescopic cylinder 14 in real time, thereby achieving precise adjustment of the rake blade spacing (accuracy ±1mm) and optimizing the uniformity of soil crushing.

[0108] In one possible implementation, such as Figure 5 As shown, the rake frame 2 includes a traction support, a first support 22, and a second support 23;

[0109] The sliding part 15 is fixedly connected to the first bracket 22 through the fixing mechanism 12;

[0110] One end of the second bracket 23 is fixedly connected to the traction bracket, and the other end is hinged to the sliding part 15 of the rake group 1.

[0111] In one possible implementation, a leveling wheel 3 is fixedly connected to the first support 22 on the side opposite to the direction of movement of the sand plow and harrow.

[0112] In one possible implementation, such as Figure 6 As shown, the fixing mechanism 12 includes two fixing plates 121 that are fixed in parallel to the sliding part 15 and at least two bolts;

[0113] The first bracket 22 has a first through hole 221 for engaging with a bolt;

[0114] The fixing plate 121 is provided with through hole groups corresponding to the first through hole 221 in a matrix arrangement. The through hole groups include at least 2 rows and at least 2 columns of second through holes 122.

[0115] Bolts pass through the first through hole 221 and the corresponding second through hole 122 respectively to clamp and fix the first bracket 22 between the two fixing plates 121.

[0116] In a preferred embodiment, the hinge between the second support 23 and the sliding part 15 is configured to allow the rake assembly 1 to swing in the vertical direction by ±8° to adapt to the undulating terrain of the sandy area, reduce the risk of deformation caused by hard impacts, and extend its service life.

[0117] The leveling wheel 3 is installed on the rear side of the first support 22 and is synchronized with the plowing action to compact and level the soil after tilling, reducing subsequent land preparation processes and improving work efficiency.

[0118] In this embodiment, the matrix-distributed through-hole group (2 rows × 2 columns) on the fixed plate 121 provides at least 4 adjustment levels. By selecting different positions of the second through-hole 122 to align with the first through-hole 221 of the first bracket 22, the fixed height of the sliding part 15 and the first bracket 22 can be quickly adjusted (adjustment range ±15cm) to adapt to different tillage depth requirements (such as shallow tillage of 15cm in sandy soil and deep tillage of 25cm in clay soil).

[0119] In addition, this embodiment adopts a clamping structure of double fixing plates 121 and bolts to ensure high tensile strength and avoid bolt loosening caused by high-frequency vibration of sand.

[0120] This disclosure significantly improves tillage efficiency and adaptability by flexibly adjusting the spacing between harrow blades (usually 15-30cm).

[0121] In sandy or loose soil, increasing the spacing (e.g., 230mm) can reduce soil accumulation and clogging, and lower traction resistance; in heavy clay soil, decreasing the spacing (e.g., 195mm) can enhance soil breaking capacity and provide more even coverage of crop residues. By adjusting the spacing (195mm or 230mm), different soil hardnesses can be accommodated, and the working depth error can be controlled within ±1cm.

[0122] In stony and sandy soils, the spacing can be increased to prevent hard objects from getting stuck, while in moist clay soils, the spacing can be reduced to improve the tilling effect, achieving "one machine for multiple uses". In addition, proper adjustment of the spacing can avoid missed tillage or repeated tillage, effectively increasing the soil breaking rate, and is especially suitable for fine land preparation before sowing.

[0123] In a preferred embodiment, the harrow groups 1 are staggered, and this design, combined with spacing adjustment, can further eliminate missed tillage zones.

[0124] The working principle of this disclosure is as follows:

[0125] The 2 rows × 2 columns of through holes on the fixing plate 121 provide 4 height settings. By changing the fixing position of the bolts, the installation height of the sliding part 15 and the first bracket 22 can be adjusted to adapt to different tillage depths.

[0126] The connection stability under sand vibration conditions is ensured by clamping with double fixing plates 121 and fixing with high-strength bolts (8.8 grade).

[0127] By synchronously extending or retracting the telescopic cylinders 14 arranged oppositely, the rake blade assemblies 11 at both ends are pushed to slide in opposite directions or away from each other along the sliding part 15.

[0128] The piston rod of the telescopic cylinder 14 is rigidly connected to the sliding part 15 through the flange to ensure efficient power transmission and reduce energy loss. When the rake assembly 11 moves, the first arm 161 and the second arm 162 of the end scissor arm expand or retract around the first hinge axis 165, driving the third arm 163 and the fourth arm 164 of the adjacent middle scissor arm to move synchronously.

[0129] By using the geometric relationship of the scissor arms (such as an arm length ratio of 1:1.5), the linear and proportional adjustment of the spacing between adjacent rake blades can be achieved.

[0130] The tractor pulls the harrow, which plows the land. When the harrow blades encounter stones, the shock absorber 114 is compressed to absorb the impact energy.

[0131] The leveling wheel 3 moves with the harrow assembly 11 to compact and level the tilled soil, reducing subsequent land preparation steps.

[0132] In the description of this disclosure, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, 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, and therefore should not be construed as a limitation of this disclosure. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. For those skilled in the art, the specific meaning of the above terms in this disclosure can be understood according to the specific circumstances.

[0133] It should also be noted that, in the description of this disclosure, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0134] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A sand plowing harrow, characterized in that, include: Rake frame (2); At least two rake assemblies (1) are fixed on the rake frame (2); The rake assembly (1) includes a sliding part (15), a spacing adjustment mechanism (16), and a fixing mechanism (12); The sliding part (15) is fixedly connected to the rake frame (2) through the fixing mechanism (12); a plurality of rake blade assemblies (11) are slidably connected on the side of the sliding part (15) away from the rake frame (2); The spacing adjustment mechanism (16) is fixedly connected to the rake blade assembly (11); A drive assembly is provided on the sliding part (15); The output end of the drive component is fixedly connected to the rake blade assembly (11) at the end, so that the output end of the drive component drives the rake blade assemblies (11) at both ends to slide in opposite directions or backward along the sliding part (15), forcing the spacing adjustment mechanism (16) to deform, so that all the intermediate rake blade assemblies (11) are driven to move synchronously and equidistantly through the spacing adjustment mechanism (16), so that the spacing between adjacent rake blade assemblies (11) is proportionally enlarged or reduced.

2. The sand plow and harrow according to claim 1, characterized in that, The rake assembly (11) includes a circular rake blade (111), a connecting plate (112), a slider (113), and a shock absorber (114); One end of the connecting plate (112) is rotatably connected to the circular rake blade (111), and the other end is fixedly connected to one end of the shock absorber (114); The other end of the shock absorber (114) is fixedly connected to the slider (113); The sliding part (15) is slidably connected to the slider (113).

3. The sand plow and harrow according to claim 2, characterized in that, The connecting plate (112) is an arc-shaped connecting plate, and the opening direction of the arc-shaped connecting plate is consistent with the forward direction of the circular rake (111).

4. The sand plow and harrow according to claim 3, characterized in that, The angle between the curvature direction of the arc-shaped connecting plate and the rotation plane of the rake blade is in the range of 15°-30°.

5. The sand plow and harrow according to claim 2, characterized in that, The shock absorber (114) is selected from one of the following: an air-filled shock absorber, a spring-damped shock absorber, a hydraulic shock absorber, and a rubber shock absorber.

6. The sand plow and harrow according to claim 1, characterized in that, The spacing adjustment mechanism (16) includes The end scissor arms are provided on the end rake assembly (11) and the middle scissor arms are provided on each of the middle rake assemblies (11); The end scissor arm includes a first arm (161), a second arm (162), and a first hinge shaft (165). One end of the first arm (161) and one end of the second arm (162) are hinged together by the first hinge shaft (165). The first hinge shaft (165) is fixedly connected to the rake assembly (11) at the end. The middle scissor arm includes a third arm (163) and a fourth arm (164), and a second hinge shaft (166). The middle parts of the third arm (163) and the fourth arm (164) are cross-hinged by the second hinge shaft (166). The second hinge shaft (166) is fixedly connected to the rake assembly (11) located in the middle. The end of the third arm (163) between two adjacent middle scissor arms is hinged, and the end of the fourth arm (164) is hinged. The other end of the first arm (161) of the end scissor arm is hinged to the end of the third arm (163) of the adjacent middle scissor arm; the other end of the second arm (162) is hinged to the end of the fourth arm (164) of the adjacent middle scissor arm. The drive assembly drives the end scissor arms to move linearly via the rake blade assembly (11) at the end, forcing the first arm (161) and second arm (162) of the end scissor arms to unfold or retract around the first hinge axis (165), thereby driving the third arm (163) and fourth arm (164) of each middle scissor arm to unfold or retract around the second hinge axis (166); thereby driving all rake blade assemblies (11) to move synchronously and equidistantly, so that the distance between adjacent rake blade assemblies (11) is proportionally enlarged or reduced.

7. The sand plow and harrow according to claim 1, characterized in that, The drive assembly includes a telescopic cylinder (14) disposed opposite to the sliding part (15); The telescopic cylinder (14) has a transmission part (13) fixed at its telescopic end; The transmission unit (13) is fixedly connected to the rake blade assembly (11) at its end.

8. The sand plow and harrow according to claim 1, characterized in that, The rake frame (2) includes a traction bracket (21), a first bracket (22), and a second bracket (23); The sliding part (15) is fixedly connected to the first bracket (22) through the fixing mechanism (12); One end of the second bracket (23) is fixedly connected to the traction bracket, and the other end is hinged to the sliding part (15) of a rake assembly (1).

9. The sand plow and harrow according to claim 8, characterized in that, A leveling wheel (3) is fixedly connected to the first support (22) on the side opposite to the direction of movement of the sand plow and harrow.

10. The sand plow and harrow according to claim 8, characterized in that, The fixing mechanism (12) includes two fixing plates (121) fixed in parallel on the sliding part (15) and at least two bolts; The first bracket (22) has a first through hole (221) for engaging with the bolt; The fixing plate (121) is provided with a matrix of through holes corresponding to the first through hole (221), and the through hole group includes at least 2 rows and at least 2 columns of second through holes (122); The bolts pass through the first through hole (221) and the corresponding second through hole (122) respectively to clamp and fix the first bracket (22) between the two fixing plates (121).

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