Straw returning equipment and use method

Abstract

The invention relates to the technical field of agricultural instruments, in particular to straw returning equipment and a using method, and the straw returning equipment comprises a shell, a cutting wheel, a first grinding wheel, a shredding wheel and a first chopping wheel; the cutting wheel is used for harvesting straw parts, and the straw parts are discharged out of the shell after being rolled by the first rolling wheel, torn by the shredding wheel and crushed by the first chopping wheel in sequence; the shredding wheel comprises a plurality of rows of first roller pins and a plurality of rows of second roller pins; each row of second roller pins and the adjacent row of first roller pins form a tearing group, the first roller pins of the same tearing group are inserted into the rod part to fix the rod part, and the second roller pins can reciprocate in the axial direction of the roller shaft while being inserted into the rod part, so that the rod part is torn, and a fiber structure in the circumferential direction of the rod part is damaged; when being cut by the first cutting wheel, the soil can be more thoroughly crushed, so that the decomposition efficiency of the soil in the soil is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and particularly relates to a straw returning device and a using method thereof. Background Art

[0002] A straw returning device is a mechanical device used to return agricultural waste, such as rice straw, wheat straw, corn straw, etc., to the field after treatment. After the straw is crushed and spread into the farmland, it can increase the organic matter content of the soil, improve the soil structure, and at the same time reduce the environmental pollution caused by burning straw. However, when crushing the straw, it is usually axially broken. Since there are more fibrous structures in the rod part of the straw, the axial fracture usually retains more complete fiber structures, which is not conducive to the invasion of microorganisms and the decomposition process is relatively slow. Summary of the Invention

[0003] The present invention provides a straw returning device and a using method thereof to solve the problem that the existing straw crushing is not thorough and affects its decomposition efficiency.

[0004] The straw returning device and the using method thereof of the present invention adopt the following technical solutions: A straw returning device includes a housing, a cutting wheel, a first rolling wheel, a shredding wheel and a first chopping wheel; a first feeding plate is installed inside the housing for receiving the rod part of the straw harvested by the cutting wheel. The axes of the first rolling wheel, the shredding wheel and the first chopping wheel are horizontal and parallel and are sequentially installed above the first feeding plate inside the housing; the rod part is sequentially rolled by the first rolling wheel, torn by the shredding wheel and broken by the first chopping wheel and then discharged from the housing; the shredding wheel includes a roller shaft, a sliding rod and a synchronous ring. The roller shaft is rotatably installed in the housing and multiple rows of first rolling needles are circumferentially arranged around the roller shaft at intervals along its axial direction; there are multiple sliding rods, which are circumferentially distributed around the roller shaft and are all axially slidably installed on the roller shaft along the axial direction of the roller shaft. Multiple second rolling needles are arranged along the axial direction of the roller shaft on the sliding rod; one ends of the multiple sliding rods are connected by a synchronous ring coaxial with the roller shaft; the second rolling needle on each sliding rod and a row of first rolling needles outside the adjacent roller shaft form a tearing group. While the sliding rod rotates synchronously with the roller shaft, it reciprocates axially along the roller shaft. While the first rolling needles of the same tearing group press against the rod part, the second rolling needles reciprocate to tear the rod part.

[0005] Optionally, a straw returning device further includes a root digging wheel, a second rolling wheel and a second chopping wheel. The root digging wheel is parallel to the cutting wheel and is located behind the cutting wheel along the traveling direction of the housing; a second feeding plate is further installed inside the housing for receiving the root part of the straw and the soil dug out by the root digging wheel; the axes of the second rolling wheel and the second chopping wheel are both horizontal and parallel and are both installed above the second feeding plate; the root part and the soil on the second feeding plate are sequentially rolled by the second rolling wheel and chopped by the second chopping wheel and then discharged from the housing.

[0006] Optionally, a first conveyor belt is installed inside the housing, and the first conveyor belt is used to send the stalks of the straw cut by the cutting wheel to the first feeding plate.

[0007] Optionally, a pushing wheel is fixedly connected to one end of the roller shaft. The end face of the pushing wheel close to the roller shaft is a wavy surface. A pushing rod is rotatably installed around the circumferential direction of the synchronous ring. The pushing rod is parallel to the roller shaft and is slidably installed along the axial direction of the roller shaft in the housing and is restricted from rotating by the housing. A convex platform is fixed on the pushing rod. A first elastic member is arranged between the convex platform and the housing. The first elastic member urges the pushing rod to abut against the wavy surface of the pushing wheel. The pushing rod reciprocates along its axial direction under the combined action of the first elastic member and the pushing wheel, and then drives the sliding rod to reciprocate through the synchronous ring.

[0008] Optionally, the second rolling wheel includes a core shaft and a rolling cylinder. The core shaft is rotatably installed in the housing. The rolling cylinder is coaxially sleeved on the core shaft and can rotate synchronously with the core shaft and axially move relative to the core shaft. A top wheel is fixed to one end of the core shaft. The end face of the top wheel close to the core shaft is a wavy surface. A top rod is installed at one end of the rolling cylinder. The top rod is parallel to the core shaft and is slidably matched with the end face of the rolling cylinder around the circumferential direction of the rolling cylinder. The top rod is slidably installed along its axial direction in the housing and is restricted from rotating by the housing. A retaining disk is fixed outside the top rod. A second elastic member is arranged between the retaining disk and the housing. The second elastic member urges the top rod to abut against the wavy surface of the end face of the top wheel. The top rod reciprocates along its axial direction under the combined action of the second elastic member and the top wheel, and then drives the rolling cylinder to reciprocate along its axial direction.

[0009] Optionally, both the first feeding plate and the second feeding plate are inclined. The side of the first feeding plate close to the first rolling wheel is higher than the side close to the first cutting wheel. The side of the second feeding plate close to the second rolling wheel is higher than the side close to the second cutting wheel.

[0010] Optionally, a second conveyor belt is further arranged inside the housing, and the second conveyor belt is used to convey the roots and soil dug out by the root digging wheel to the second feeding plate.

[0011] Optionally, a first discharge port and a second discharge port are arranged on the housing. Both the first discharge port and the second discharge port are in a flared shape and are located at the rear side in the traveling direction of the housing. The first discharge port is communicated with the upper part of the first feeding plate. The second discharge port is located below the first discharge port and is communicated with the upper part of the second feeding plate. Along the traveling direction of the housing, the discharge position of the second discharge port is located at the rear side of the discharge position of the first discharge port.

[0012] Optionally, there are two first discharge ports, which are arranged at intervals along the axial direction of the first cutting wheel. The second discharge port is located below the middle of the two first discharge ports.

[0013] A using method of a straw returning equipment, which is applicable to the above-mentioned straw returning equipment, includes the following steps: S10. Install the outer shell on a mobile mechanical device and drive the outer shell to move by means of the mechanical device; S20. Start the cutting wheel and the root digging wheel to rotate, harvest the stalk part and the root part of the straw respectively, send the stalk part to the first feeding plate, and send the root part and the soil to the second feeding plate; and start the first rolling wheel, the shredding wheel and the first chopping wheel to roll, tear and crush the stalk part respectively, and start the second rolling wheel and the second chopping wheel to roll and crush the root part respectively; S30. Discharge the shredded stalk part and root part, and cover the shredded root part and the soil carried by the root part above the shredded stalk part.

[0014] The beneficial effects of the present invention are as follows: By providing a shredding wheel in the straw returning equipment of the present invention and making the first rolling pins and the second rolling pins on the shredding wheel act together, the distance between the two rows of the first rolling pins and the second rolling pins in the same tearing group is relatively close, and they can simultaneously penetrate into the flattened stalk part. The first rolling pin penetrates into the stalk part to fix the stalk part, and the second rolling pin can reciprocate axially along the roller shaft while penetrating into the stalk part, thereby tearing the stalk part and destroying the fiber structure in the circumferential direction of the stalk part. When it is chopped by the first chopping wheel, it can be crushed more thoroughly, accelerating its decomposition efficiency in the soil.

[0015] Furthermore, a root digging wheel is provided to dig out the root part of the straw, crush the root part and the soil carried by the root part, and cover the crushed root part and the soil above the crushed stalk part. Since the root part and the soil are heavy and have a large density, it helps to fix the stalk part to prevent it from being blown away by the wind, and helps to reduce water erosion and avoid the stalk part from being washed away by water after heavy rainfall; furthermore, the stalk part is covered under the soil and the root part, and the moisture in the soil can further promote the decomposition of the stalk part. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a straw returning equipment of the present invention; Figure 2 It is a side view of the overall structure of an embodiment of a straw returning equipment of the present invention; Figure 3 It is Figure 2 The sectional view taken along the line A-A in Figure 4 It is Figure 2Cross-sectional view along line B-B (the dashed lines in the figure indicate the discharging ranges of the first discharging port and the second discharging port); Figure 5 Top view of the overall structure of an embodiment of a straw returning device according to the present invention; Figure 6 is Figure 5 Cross-sectional view along line C-C; Figure 7 Schematic structural view of the first rolling wheel, shredding wheel, first chopping wheel, second rolling wheel and second chopping wheel in an embodiment of a straw returning device according to the present invention; Figure 8 Schematic structural view of the second rolling wheel in an embodiment of a straw returning device according to the present invention; Figure 9 is Figure 8 Enlarged view at D in; Figure 10 Schematic structural view of the shredding wheel in an embodiment of a straw returning device according to the present invention; Figure 11 is Figure 10 Enlarged view at E in.

[0018] In the figure: 100, outer shell; 110, first feeding plate; 120, second feeding plate; 130, first discharging port; 140, second discharging port; 150, guiding plate; 160, first motor; 210, cutting wheel; 220, first conveyor belt; 230, first rolling wheel; 240, shredding wheel; 241, roller shaft; 242, sliding rod; 243, synchronous ring; 244, first needle roller; 245, second needle roller; 246, pushing wheel; 247, push rod; 248, first elastic member; 250, first chopping wheel; 310, root digging wheel; 320, second rolling wheel; 321, core shaft; 322, rolling cylinder; 323, top wheel; 324, top rod; 325, second elastic member; 330, second chopping wheel; 340, second conveyor belt. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] An embodiment of a straw returning device of the present invention, as Figures 1 to 11 shown, includes an outer shell 100, a cutting wheel 210, a first rolling wheel 230, a shredding wheel 240 and a first chopping wheel 250.

[0021] Inside the housing 100, a first feeding plate 110 is installed to receive the stalk parts of the straw harvested by the cutting wheel 210. The axes of the first rolling wheel 230, the shredding wheel 240, and the first chopping wheel 250 are horizontal and parallel and are sequentially installed above the first feeding plate 110 inside the housing 100. It is set that the housing 100 moves from back to front, then the cutting wheel 210, the first rolling wheel 230, the shredding wheel 240, and the first chopping wheel 250 are sequentially arranged from front to back, and their axes all extend along the horizontal direction perpendicular to the traveling direction of the housing 100. When the cutting wheel 210 rotates, it can cut the straw and convey it from front to back above it. Its specific structure is the prior art and will not be elaborated here. Among them, the rotating directions of the first rolling wheel 230, the shredding wheel 240, and the first chopping wheel 250 are the same, and all are opposite to the rotating direction of the cutting wheel 210. The first rolling wheel 230, the shredding wheel 240, and the first chopping wheel 250 can be driven by separate driving parts, or connected to each other by a transmission belt between two of them and driven by one driving part.

[0022] The stalk parts of the straw are sequentially rolled by the first rolling wheel 230, torn by the shredding wheel 240, and broken by the first chopping wheel 250 and then discharged from the housing 100.

[0023] Among them, the shredding wheel 240 includes a roller shaft 241, a sliding rod 242, and a synchronous ring 243. The roller shaft 241 is rotatably installed in the housing 100, and multiple rows of first rolling needles 244 are arranged around the circumference of the roller shaft 241. A plurality of first rolling needles 244 in each row are spaced apart along its axial direction. There are multiple sliding rods 242, and they are distributed circumferentially around the roller shaft 241 and are all slidably installed along the axial direction of the roller shaft 241. A plurality of second rolling needles 245 are arranged along the axial direction of the roller shaft 241 on the sliding rod 242. Specifically, the sliding rod 242 and the roller shaft 241 are in keyway fit along the axial direction of the roller shaft 241, so that the sliding rod 242 can axially slide relative to the roller shaft 241 and rotate synchronously with the roller shaft 241. Both the second rolling needles 245 and the first rolling needles 244 extend radially along the roller shaft 241, and the ends of the second rolling needles 245 and the first rolling needles 244 far from the central axis of the roller shaft 241 are located on the same circumferential surface coaxial with the roller shaft 241. One end of the multiple sliding rods 242 is connected by a synchronous ring 243 coaxial with the roller shaft 241. The second rolling needles 245 on each sliding rod 242 and a row of first rolling needles 244 outside its adjacent roller shaft 241 form a tearing group. While the sliding rod 242 rotates synchronously with the roller shaft 241, it axially reciprocates along the roller shaft 241. While the first rolling needles 244 of the same tearing group press against the stalk part, the second rolling needles 245 reciprocate to tear the stalk part.

[0024] During use, the outer shell 100 moves from back to front. The cutting wheel 210 rotates to cut off the stalk part of the straw. After the first feeding plate 110 receives the stalk part, it is first rolled by the first rolling wheel 230 to facilitate the insertion of the first needle roller 244 and the second needle roller 245 of the shredding wheel 240. The distance between the two columns of the first needle roller 244 and the second needle roller 245 in the same tearing group is relatively close, and they can simultaneously penetrate into the flattened stalk part. The first needle roller 244 penetrates into the stalk part to fix it, and the second needle roller 245 can reciprocate axially along the roller shaft 241 while penetrating into the stalk part, thereby tearing the stalk part and destroying the fiber structure in the circumferential direction of the stalk part. When it is shredded by the first shredding wheel 250, it can be shredded more thoroughly, accelerating its decomposition efficiency in the soil.

[0025] In this embodiment, a straw returning device further includes a root digging wheel 310, a second rolling wheel 320, and a second shredding wheel 330. The root digging wheel 310 is parallel to the cutting wheel 210 and is located at the rear side of the cutting wheel 210 along the advancing direction of the outer shell 100. The root digging wheel 310 rotates in the same direction as the cutting wheel 210, and the root digging wheel 310 and the cutting wheel 210 can be driven by separate driving members, or the two can be connected by a transmission belt and driven by one driving member. The specific structure of the root digging wheel 310 is prior art and will not be described in detail. A second feeding plate 120 is further installed in the outer shell 100 for receiving the roots of the straw and the soil dug out by the root digging wheel 310. The axes of the second rolling wheel 320 and the second shredding wheel 330 are both horizontal and parallel and are both installed above the second feeding plate 120. The second rolling wheel 320 and the second shredding wheel 330 rotate in the same direction and both rotate in the opposite direction to the root digging wheel 310. The second rolling wheel 320 and the second shredding wheel 330 can be driven by separate driving members, or the two can be connected by a transmission belt and driven by one driving member. The roots and soil on the second feeding plate 120 are sequentially rolled by the second rolling wheel 320 and shredded by the second shredding wheel 330 and then discharged from the outer shell 100.

[0026] In this embodiment, a first conveyor belt 220 is installed in the outer shell 100. The first conveyor belt 220 is used to convey the stalk part of the straw harvested by the cutting wheel 210 to the first feeding plate 110. A second conveyor belt 340 is further provided in the outer shell 100. The second conveyor belt 340 is used to convey the roots and soil dug out by the root digging wheel 310 to the second feeding plate 120. The first conveyor belt 220 and the second conveyor belt 340 are respectively installed on a set of pulleys rotatably arranged in the outer shell 100, and the cutting wheel 210 can be connected to the pulley of the first conveyor belt 220 by a transmission belt and thus driven by one driving member. The root digging wheel 310 can be connected to the pulley of the second conveyor belt 340 by a transmission belt and thus driven by one driving member.

[0027] In this embodiment, a push wheel 246 is fixedly connected to one end of the roller shaft 241, and the end face of the push wheel 246 close to the roller shaft 241 is a wavy surface; a push rod 247 is rotatably mounted around the circumferential direction of the synchronous ring 243. The push rod 247 is parallel to the roller shaft 241 and is axially slidably mounted on the housing 100 and is restricted from rotating by the housing 100. A convex platform is fixed on the push rod 247, and a first elastic member 248 is arranged between the convex platform and the housing 100. The first elastic member 248 urges the push rod 247 to abut against the wavy surface of the push wheel 246. The push rod 247 reciprocates axially under the combined action of the first elastic member 248 and the push wheel 246, and then drives the sliding rod 242 to reciprocate through the synchronous ring 243.

[0028] In this embodiment, the second roller 320 includes a core shaft 321 and a rolling cylinder 322. The core shaft 321 is rotatably mounted on the housing 100, and the rolling cylinder 322 is coaxially sleeved on the core shaft 321 and can rotate synchronously with the core shaft 321 and axially move relative to the core shaft 321; a top wheel 323 is fixed to one end of the core shaft 321, and the end face of the top wheel 323 close to the core shaft 321 is a wavy surface; a push rod 324 is installed at one end of the rolling cylinder 322. The push rod 324 is parallel to the core shaft 321 and is circumferentially slidably matched with the end face of the rolling cylinder 322 around the rolling cylinder 322; the push rod 324 is axially slidably mounted on the housing 100 and is restricted from rotating by the housing 100; a retaining disc is fixed outside the push rod 324, and a second elastic member 325 is arranged between the retaining disc and the housing 100. The second elastic member 325 urges the push rod 324 to abut against the wavy surface of the end face of the top wheel 323; the push rod 324 reciprocates axially under the combined action of the second elastic member 325 and the top wheel 323, and then drives the rolling cylinder 322 to reciprocate axially. Among them, the first elastic member 248 and the second elastic member 325 are both springs.

[0029] In this embodiment, the first roller 230 and the shredding wheel 240 are connected and driven by a transmission belt. The shredding wheel 240 and the first cutting wheel 250 are connected and driven by a transmission belt. A first motor 160 is installed in the housing 100. The first motor 160 is meshed with the toothed rings mounted on the core shafts 321 of the first roller 230 and the second roller 320 respectively through two gears, so as to drive the first roller 230 and the second roller 320 to rotate synchronously and in the same direction. The cutting wheel 210 is connected to the pulley of the first conveyor belt 220 by a transmission belt. The root digging wheel 310 is connected to the pulley of the second conveyor belt 340 by a transmission belt, and the cutting wheel 210 and the root digging wheel 310 are connected by a transmission belt. A second motor is also installed in the housing 100. The output shaft of the second motor is connected to the cutting wheel 210 by a transmission belt, so as to drive the root digging wheel 310, the first conveyor belt 220 and the second conveyor belt 340 to rotate synchronously and in the same direction.

[0030] In this embodiment, both the first feeding plate 110 and the second feeding plate 120 are inclined. The side of the first feeding plate 110 close to the first grinding wheel 230 is higher than the side close to the first cutting wheel 250, and the side of the second feeding plate 120 close to the second grinding wheel 320 is higher than the side close to the second cutting wheel 330. The side of the first feeding plate 110 close to the first grinding wheel 230 is a first arc segment coaxial with the first grinding wheel 230 to increase the extrusion area of the first grinding wheel 230 on the rod part on the first feeding plate 110; the side of the second feeding plate 120 close to the first grinding wheel 230 is a second arc segment coaxial with the second grinding wheel 320 to increase the extrusion area of the second grinding wheel 320 on the root part on the second feeding plate 120. One end of the first conveyor belt 220 close to the first feeding plate 110 is higher than the end close to the cutting wheel 210, and the end close to the first feeding plate 110 is higher than the first feeding plate 110. One end of the second conveyor belt 340 close to the second feeding plate 120 is higher than the end close to the root digging wheel 310, and the end close to the second feeding plate 120 is higher than the second feeding plate 120.

[0031] In this embodiment, two guide plates 150 are further arranged in the housing 100. The two guide plates 150 are located on the upper side of the second conveyor belt 340 and guide the roots and soil on the second conveyor belt 340 to fall to the middle part of the second feeding plate 120 in the axial direction of the second grinding wheel 320, so as to prevent the rolling cylinder 322 of the second grinding wheel 320 from not rolling the roots in place when reciprocating along its axis.

[0032] In this embodiment, a first discharge port 130 and a second discharge port 140 are arranged on the housing 100. Both the first discharge port 130 and the second discharge port 140 are in a flared shape and are located at the rear side in the traveling direction of the housing 100. The first discharge port 130 is communicated with the upper part of the first feeding plate 110; the second discharge port 140 is located below the first discharge port 130 and is communicated with the upper part of the second feeding plate 120; along the traveling direction of the housing 100, the discharge position of the second discharge port 140 is located at the rear side of the discharge position of the first discharge port 130. Fans are arranged in both the first discharge port 130 and the second discharge port 140 to disperse and throw out the rod parts, root parts and soil.

[0033] In this embodiment, there are two first discharge ports 130, which are arranged at intervals along the axial direction of the first cutting wheel 250, and the second discharge port 140 is located below the middle of the two first discharge ports 130.

[0034] When a straw returning device of the present invention is in use, the housing 100 needs to be installed on a mechanical device that can travel. The mechanical device drives the housing 100 to move, and the first motor 160 and the second motor (not shown in the figure) are started. The first motor 160 drives the cutting wheel 210, the root digging wheel 310, the first conveyor belt 220, and the second conveyor belt 340 to rotate. The second motor drives the first rolling wheel 230, the shredding wheel 240, the first chopping wheel 250, the second rolling wheel 320, and the second chopping wheel 330 to rotate, and the rotation directions of the first motor 160 and the second motor are opposite.

[0035] When the cutting wheel 210 rotates, it cuts off the stalk part of the straw, and when it rotates, it brings the stalk part onto the first conveyor belt 220. The first conveyor belt 220 sends the stalk part to the first feeding plate 110. When the first rolling wheel 230 rotates, it rolls the stalk part on the first feeding plate 110. Since the first feeding plate 110 is inclined and the first rolling wheel 230 has a tendency to push the stalk part towards the shredding wheel 240 when rotating, the flattened stalk part moves to the lower side of the shredding wheel 240. When the shredding wheel 240 rotates, the first rolling pin 244 and the second rolling pin 245 of the same tearing group penetrate into the stalk part. The first rolling pin 244 penetrates into the stalk part to fix it, and the second rolling pin 245 reciprocates axially along the roller shaft 241 with the sliding rod 242 to tear the stalk part and destroy the fiber structure in the circumferential direction of the stalk part. The torn stalk part moves to the lower side of the first chopping wheel 250 under the action of the inclined first feeding plate 110 and the rotation of the shredding wheel 240, and the first chopping wheel 250 cuts and crushes the stalk part as it moves.

[0036] When the root digging wheel 310 rotates, it digs out the root part of the straw. The dug-out root part will carry some soil. When the root digging wheel 310 rotates, it sends the root part and the carried soil onto the second conveyor belt 340. The second conveyor belt 340 sends the root part and the soil to the second feeding plate 120. The rolling cylinder 322 of the second rolling wheel 320 reciprocates axially along the core shaft 321 while rotating along the core shaft 321, improving the rolling effect on the root part and reducing the probability of the soil carried by the root part from caking. Since the second feeding plate 120 is inclined and the second rolling wheel 320 has a tendency to push the root part and the soil towards the second chopping wheel 330 when rotating, the flattened root part and the soil move to the lower side of the second chopping wheel 330. When the second chopping wheel 330 rotates, it cuts the root part and the soil into pieces.

[0037] The crushed roots and soil on the second material conveying plate 120 are discharged from the second discharge port 140, and the crushed rod parts on the first material conveying plate 110 are discharged from the first discharge port 130. The first discharge port 130 is located in front of the second discharge port 140, so the rod parts will be discharged before the roots. As a result, the crushed roots and soil discharged from the second discharge port 140 cover the crushed rod parts. Since the roots and soil are heavy and have a large density, they help to fix the rod parts and prevent them from being blown away by the wind, and also help to reduce water erosion and prevent the rod parts from being washed away by water after heavy rainfall. Further, the rod parts are covered under the soil and roots, and the moisture in the soil can further promote the decomposition of the rod parts.

[0038] A method for using a straw returning device, which is applicable to the above-mentioned straw returning device, includes the following steps: S10, Install the housing 100 on a mechanical device that can travel, and drive the housing 100 to move by using the mechanical device; S20, Start the cutting wheel 210 and the root digging wheel 310 to rotate, respectively harvest the rod parts and roots of the straw, and send the rod parts to the first material conveying plate 110, and send the roots and soil to the second material conveying plate 120; and start the first rolling wheel 230, the tearing wheel 240 and the first chopping wheel 250 to roll, tear and crush the rod parts respectively, and start the second rolling wheel 320 and the second chopping wheel 330 to roll and crush the roots respectively; S30, Discharge the crushed rod parts and roots, and make the crushed roots and the soil carried by the roots cover the crushed rod parts.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A straw returning device, characterized in that: It includes a housing, a cutting wheel, a first rolling wheel, a shredding wheel and a first chopping wheel; A first feeding plate is installed inside the housing for receiving the stalks of the straw harvested by the cutting wheel. The axes of the first rolling wheel, the shredding wheel and the first chopping wheel are horizontal and parallel and are successively installed above the first feeding plate inside the housing; The stalks are successively rolled by the first rolling wheel, torn by the shredding wheel and broken by the first chopping wheel and then discharged from the housing; The shredding wheel includes a roller shaft, sliding rods and a synchronous ring. The roller shaft is rotatably installed in the housing, and multiple rows of first rolling needles are circumferentially arranged around the roller shaft at intervals along its axial direction; there are multiple sliding rods, which are circumferentially distributed around the roller shaft and are all slidably installed along the axial direction of the roller shaft. Multiple second rolling needles are arranged along the axial direction of the roller shaft on the sliding rods; one ends of the multiple sliding rods are connected by a synchronous ring coaxial with the roller shaft; the second rolling needles on each sliding rod and a row of first rolling needles outside the adjacent roller shaft form a tearing group. While the sliding rods rotate synchronously with the roller shaft, they reciprocate along the axial direction of the roller shaft. While the first rolling needles of the same tearing group press against the stalks, the second rolling needles reciprocate to tear the stalks.

2. The straw returning equipment according to claim 1, characterized in that: It further includes a root digging wheel, a second rolling wheel and a second chopping wheel. The root digging wheel is parallel to the cutting wheel and is located at the rear side of the cutting wheel along the advancing direction of the housing; a second feeding plate is also installed inside the housing for receiving the roots of the straw and the soil dug out by the root digging wheel; the axes of the second rolling wheel and the second chopping wheel are both horizontal and parallel and are both installed above the second feeding plate; the roots and soil on the second feeding plate are successively rolled by the second rolling wheel and chopped by the second chopping wheel and then discharged from the housing.

3. A straw returning device according to claim 2, characterized in that: A first conveyor belt is installed inside the housing, and the first conveyor belt is used to send the stalks of the straw harvested by the cutting wheel to the first feeding plate.

4. A straw returning device according to claim 2, characterized in that: One end of the roller shaft is fixedly connected with a pushing wheel, and the end face of the pushing wheel close to the roller shaft is a wavy surface; a push rod is rotatably installed around the circumference of the synchronous ring. The push rod is parallel to the roller shaft and is slidably installed along its axial direction in the housing and is restricted from rotating by the housing. A convex platform is fixed on the push rod, and a first elastic member is arranged between the convex platform and the housing. The first elastic member urges the push rod to abut against the wavy surface of the pushing wheel. The push rod reciprocates along its axial direction under the combined action of the first elastic member and the pushing wheel, and then drives the sliding rods to reciprocate through the synchronous ring.

5. The straw returning equipment according to claim 2, characterized in that: The second rolling wheel includes a core shaft and a rolling cylinder. The core shaft is rotatably installed in the housing, and the rolling cylinder is coaxially sleeved on the core shaft and can rotate synchronously with the core shaft and axially move relative to the core shaft; a top wheel is fixed at one end of the core shaft, and the end face of the top wheel close to the core shaft is a wavy surface; a top rod is installed at one end of the rolling cylinder. The top rod is parallel to the core shaft and is slidably matched with the end face of the rolling cylinder around the circumference of the rolling cylinder; the top rod is slidably installed along its axial direction in the housing and is restricted from rotating by the housing; a retaining disc is fixed outside the top rod, and a second elastic member is arranged between the retaining disc and the housing. The second elastic member urges the top rod to abut against the wavy surface of the end face of the top wheel; the top rod reciprocates along its axial direction under the combined action of the second elastic member and the top wheel, and then drives the rolling cylinder to reciprocate along its axial direction.

6. The straw returning equipment according to claim 2, characterized in that: Both the first feeding plate and the second feeding plate are inclined. The side of the first feeding plate close to the first rolling wheel is higher than the side close to the first chopping wheel, and the side of the second feeding plate close to the second rolling wheel is higher than the side close to the second chopping wheel.

7. A straw returning device according to claim 2, characterized in that: A second conveyor belt is also arranged inside the housing, and the second conveyor belt is used to convey the roots and soil dug out by the root digging wheel to the second feeding plate.

8. The straw returning equipment according to claim 2, characterized in that: A first discharge port and a second discharge port are arranged on the housing. Both the first discharge port and the second discharge port are in a flared shape and are located at the rear side in the advancing direction of the housing. The first discharge port communicates with the upper part of the first feeding plate. The second discharge port is located below the first discharge port and communicates with the upper part of the second feeding plate. Along the advancing direction of the housing, the discharging position of the second discharge port is located at the rear side of the discharging position of the first discharge port.

9. The straw returning equipment according to claim 8, characterized in that: There are two first discharge ports, which are arranged at intervals along the axial direction of the first cutting wheel, and the second discharge port is located below the middle of the two first discharge ports.

10. A method for using a straw returning device, applicable to a straw returning device according to any one of claims 2 to 9, characterized in that, It includes the following steps: S10, install the housing on a mobile mechanical device, and drive the housing to move by using the mechanical device; S20, start the cutting wheel and the root digging wheel to rotate, harvest the stalks and roots of the straw respectively, send the stalks to the first feeding plate, and send the roots and soil to the second feeding plate; and start the first rolling wheel, the tearing wheel and the first cutting wheel to roll, tear and crush the stalks respectively, and start the second rolling wheel and the second cutting wheel to roll and crush the roots respectively; S30, discharge the crushed stalks and roots, and cover the crushed roots and the soil carried by the roots above the crushed stalks.

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