CN105557091B - A kind of loose plowing device - Google Patents

Abstract

The invention discloses a loose tillage device, which comprises a transmission box, and more than one transmission shaft is arranged in the transmission box, one end of the transmission shaft protrudes from the transmission box, and a loose tillage tool is connected to the protruding end of the transmission shaft; the loose tillage tool includes Knife bar, on the knife bar, be fixed with helicoid, blade is installed on helical piece, be fixed with the first inserting blade in the lower end of helicoid, be fixed with the second inserting blade in the lower end of knife bar; The first inserting blade and the second The lower end of the inserting blade is lower than the bottom surface of the cutter bar, and the upper end of the cutter bar is dislocated with a crushing and leveling blade, and the crushing and leveling blade has an insertion part, a first bending part and a second bending part. The structure of the present invention can make the loose tillage tool easier to penetrate into the soil. When entering the soil, the force of the loose tiller tool is more uniform, and the fluffy performance and crushing degree in the vertical direction of the land are different, which is more conducive to the growth of plants. Better secondary crushing for leveling the surface soil.

Description

A plowing device

technical field

The invention relates to loose tillage devices.

Background technique

For the loose tiller, one of the important parts that affect the loose tillage effect is the loose tiller tool. The traditional loose tillage tools are plow and harrow, but the plow can only plow the land and cannot achieve the purpose of crushing. Although the harrow can play a certain role in crushing, the crushing effect is poor and the crushing efficiency is low.

With the country's strong support for agricultural production, the current semi-automated or automated farming equipment has been widely used, such as existing agricultural machinery such as seeders and harvesters.

For plants, the fluffy soil can promote the root system of the plant to be more developed during the growth process, and the developed root system can absorb more nutrients from the soil, making the plant grow faster and more lush. When cultivating the land, if we continue to use traditional farming methods, the purpose of making the soil fluffy can be achieved. Therefore, as early as a few years ago, some people have been studying the use of automatic loosening machines to realize the cultivation of the land. It has been proved by experiments that in Plants are sown on the land cultivated by the spiral cutter, and the growth effect of the plants is obviously improved.

The current loosening tool is basically an auger drill rod. For example, the Chinese patent application number is 201520088069.4, and the application date is 2015.2.9, and the date of authorization announcement is 2015.8.26. , It is specifically disclosed that it includes a drill rod and a helical blade, and the helical blade is wound around the bottom of the drill rod, and it also includes a soil-entry blade, and the soil-entry blade is arranged at the tail of the helical blade and is positioned at the lower surface of the helical blade. The utility model has a simple structure. When working on arable land, the drill pipe rotates and moves forward with the subsoiler. Since the lower surface of the tail of the helical blade is provided with a cutting blade, it is convenient for the drill pipe to enter the soil while rotating, and at the same time, it can effectively avoid The spiral blades are worn, prolonging the life of the spiral blades. However, in actual use, it has been found that because only the tail end of the helical blade is connected with the soil inserting blade, when the auger bit enters the soil, the soil inserting blade cuts the soil, and only one side of the soil inserting blade bears force. Unevenness will cause deformation and cracking of the soil-entry blade or uneven connection force between the soil-entry blade and the helical blade, and the stress on the drill pipe is also uneven, which may easily cause deformation or even breakage of the drill pipe.

In the patent document with the Chinese patent application number 201510064514.8, the application date is 2015.2.9, and the authorized announcement date is 2015.5.20, an auger bit of a subsoiling cultivator that avoids piling up soil is disclosed, which includes a drill rod, a helical blade, and a helical blade. Winding around the lower part of the drill rod, it also includes a cross-cutting blade, which is arranged on the upper part of the drill rod and above the helical blade. The structure is simple, because the upper part of the drill pipe is equipped with a cross-cutting blade, which can be connected to the upper half of the drill pipe by welding or fasteners. The machine moves forward, and the cross-cutting blade can effectively shovel the piled soil generated in front of the drill pipe after deep plowing and subsoiling, eliminating the phenomenon of piled soil and greatly improving the production efficiency of arable land operations. However, the cross-cutting blade of the given structure cannot effectively crush the soil for the second time. In addition, if the pile of soil is too much or too high, when the cross-cutting blade of the structure is leveling the soil, the horizontal cutting blade may be stuck due to insufficient power. , Eventually, the drill pipe will stop rotating, while the power continues to output, which can easily damage the equipment or even burn it out.

In addition, during the growth of plants, the fluffy performance and degree of crushing in the vertical direction of the land will also affect the growth of plants.

Contents of the invention

In order to make the loose tillage tool easier to enter the soil, the force of the loose tiller tool is more uniform when entering the soil. During the process of loose tillage, the looseness of the soil in the vertical direction and the degree of crushing are different, which is more conducive to the growth of plants. growth, the use of cutters can better level the surface soil for secondary crushing, and the invention provides a loose tillage device.

In order to achieve the above object, a kind of plowing device includes a transmission box, and the transmission box is provided with more than one transmission shaft, and one end of the transmission shaft stretches out from the transmission box, and a plowing tool is connected to the extended end of the transmission shaft; Loose cultivator tool includes arbor, helical sheet wound on the arbor and blades installed on the helical sheet; the number of blades in different pitches on the same helical sheet is different; Or the blade body bent upwards obliquely, the fixing part is fixed on the helical piece by a bolt assembly; the blade has a soil cutting blade and a knife back, the soil cutting blade is opposite to the spiral direction of the helical piece, and the knife back is set opposite to the soil cutting blade; on the helical piece The lower end of the first blade is fixed with the first soil blade; the first soil blade includes a first connecting portion and a first blade, the first connecting portion is connected to the lower end of the spiral piece, the lower surface of the first blade has a slope so that the first blade is wedge-shaped, and the first blade is wedge-shaped. The upper surface of a blade has a receiving groove, and the first alloy sheet is embedded in the receiving groove, and the first soil-entrying blade extends obliquely downward, and the lower end of the first soil-entrying blade is lower than the bottom surface of the cutter bar; There is more than one second soil-entrying blade, the second soil-entrying blade includes a second connection part and a second blade, the second connection part is connected on the cutter bar, the lower surface of the second blade has a bevel so that the second blade is wedge-shaped, and the second blade is wedge-shaped. The upper surface of the blade has a receiving groove, and the second alloy sheet is embedded in the receiving groove, and the second soil-entry blade extends obliquely downward, and the lower end of the second soil-entry blade is lower than the bottom surface of the cutter bar, and the second blade is connected from the second The direction in which the upper portion extends is consistent with the direction opposite to the direction of rotation of the helical piece; more than two sockets are fixed on the upper part of the cutter bar, and the sockets extend radially, and the sockets are arranged in a dislocation in the axial direction of the cutter bar. The socket is provided with a socket, and a crushing and leveling blade is plugged into the socket. The crushing and leveling blade includes a socket, a first curved portion and a second curved portion, and the first curved portion is self-inserting. The outer end of the connecting portion extends in the same direction as the spiral piece, the second curved portion extends downward from the first curved portion, and a crushing blade is provided outside the crushing and leveling blade.

The above-mentioned structure, because different numbers of blades are arranged in different pitches on the same helical piece, in this way, in the process of loose tillage, the loose plowing tool can pulverize the land more fully in the pitches with more blades, and the land will be more fluffy. On the contrary, the crushing effect and fluffiness of the land are relatively poor, which is more suitable for the growth of plants. Owing to being provided with the first soil-buried blade and the second soil-buried blade, the second soil-buried blade can comprise many, and, the lower end of the first soil-buried blade and the second soil-buried blade is all lower than the bottom surface of cutter bar, simultaneously, the first soil-buried blade and The second soil-entry blades all extend obliquely downwards, and the inclination angles of the first soil-entry blades and the second soil-entry blades are equivalent to the inclination angles of the helical blades. Like this, when the plowing cutter is in the soil, the first soil-entry blades and the second soil-entry blades cut simultaneously soil, so that the force on the circumference of the cutter bar is uniform, and it is easy to enter the soil. Therefore, the tool bar is not easy to deform and break. At the same time, the force of the first soil-entry blade and the second soil-entry blade is also uniform. The second soil-piercing blade is not easily deformed and cracked, the connection reliability between the first soil-piercing blade and the spiral piece is good, and the connection reliability between the second soil-piercing blade and the cutter bar is also good; with the above structure, because the second soil-piercing blade has only a small part When it is connected with the cutter bar, when the force is uniform, the connection between the second soil inserting blade and the cutter bar is not prone to stress concentration, so the connection strength is high. Due to the setting of the first alloy sheet and the second alloy sheet, the hardness of the alloy sheet is large. When the loose tillage tool enters the soil, the first soil entry blade and the second soil entry blade are not easy to wear, especially when the loose tillage tool is completely inserted into the soil and crushed horizontally When the soil is in the soil, the first soil-entry blade and the second soil-entry blade are still playing the role of cutting the soil at the bottom layer. Generally speaking, the hardness of the bottom layer of the soil is relatively high, and when the loosening tool cuts the soil horizontally, the first soil-entry blade and the second soil-entry blade The blade may also touch the stone, so the inlaid alloy sheet can improve the strength and prolong the life. Because the blade has a soil-cutting blade, when the knife bar rotates, the soil-cutting blade cuts soil, on the one hand, the blade can be cut into the soil more easily, and on the other hand, the resistance to the lateral cutting of the loose tiller can be reduced. Because the crushing and leveling blades of the structure of the present invention are set, the vertical dislocation of the crushing and leveling blades is set, and there is a gap between adjacent crushing and leveling blades, so that when the soil after loosening and plowing is leveled, each crushing and leveling blade is divided Layer leveling, when the cutter bar is rotating, the crushed soil will flow between the crushing and leveling blades, thus greatly reducing the leveling resistance, and the leveling effect is good, which can effectively prevent the crushed soil from bulging In addition, there is a second curved portion, and the second curved portion has a raking effect on the soil, which further improves the leveling effect. Because the crushing blade is provided, the crushing blade basically extends horizontally and has a second curved portion, so that the crushed soil can be crushed twice, and the resistance of crushing the soil can be reduced.

Further, from bottom to top, the number of blades in different pitches on the same helical piece decreases successively. This structure makes the lower layer of soil more fluffy and more fully crushed, while the upper layer of soil has poor fluffy performance and relatively poor crushing effect. In this way, during the growth process of plants, the root system is easier to grow downward, and the growth performance of plants is better.

Further, the reduction in the number of blades in adjacent pitches is one.

Further, the number of blades on different helical sheets is different.

Further, the middle part of the soil cutting blade protrudes outwards to form an arc. When the blade is cutting the soil, the force that the soil acts on the blade body can be decomposed into the first component force perpendicular to the soil cutting blade and the second component force tangential to the soil cutting blade, thereby reducing the impact of the soil on the blade body. On the one hand, it can reduce the bending deformation of the blade, reduce the wear and damage to the soil cutting blade, and prolong the service life of the blade. On the other hand, the shear force on the bolt assembly is also reduced, which improves the blade and The connection strength of the helix.

Further, the upper surface of the soil cutting blade is inclined so that the soil cutting blade is wedge-shaped, and a first rib extending along the soil cutting blade is provided on the lower surface of the soil cutting blade. When the soil cutting blade is wedge-shaped, the blade body can be cut into the soil more easily, and of course the strength of the blade is also reduced. For this reason, the strength of the soil cutting blade can be improved by setting the first rib, although the first rib There will be a certain resistance between the crushed soil, but when the crushed soil passes through the first rib, the first rib can crush the crushed soil again, which improves the crushing effect.

Further, the bolt assembly includes a bolt and a nut, the bolt passes through the helical piece and the fixing part sequentially from top to bottom, and a nut that compresses the blade is threadedly connected to the lower end of the bolt; the nut includes a nut and A round head integrated with the nut, with a carburized layer on the outer surface of the round head. When the loose plowing tool is loose plowing, the nut and the soil will interact, which will easily cause the nut to wear. If the ordinary nut is used to lock the blade, on the one hand, the nut will be worn, and on the other hand, the nut on the bolt will be damaged, causing the nut to be damaged. Therefore, in the present invention, by setting the round head, the end of the bolt is hidden in the nut to prevent the thread of the bolt from being damaged. On the other hand, the round head can effectively protect the nut of the present invention and prevent the nut from Early wear and tear, in order to prevent the nut from being worn early, a carburized layer with higher hardness is set.

Further, a rib plate is welded between the second soil-entrying blade and the cutter bar to improve the connection strength between the first soil-entrying blade and the cutter bar.

Further, the position corresponding to the crushing blade on the crushing and leveling blade is provided with a second rib extending along the crushing blade, and the second rib can not only improve the strength of the crushing and leveling blade, but also play a role in further crushing .

Further, the inclination angles of the first soil-entry blade and the second soil-entry blade are the same, so that the loose tiller is more evenly stressed when it enters the soil.

Description of drawings

Figure 1 is a schematic diagram of a loose tillage device.

Fig. 2 is a sectional view of the loose tillage device.

Fig. 3 is a perspective view of a loose tiller tool.

Fig. 4 is a perspective view of another viewing angle of the plowing tool.

Fig. 5 is an exploded view of the plowing tool.

Figure 6 is a perspective view of a bolt assembly.

Figure 7 is an exploded view of the bolt assembly.

Fig. 8 is a schematic diagram of locking the helical piece and the blade by a bolt assembly.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 1 and 2 , the loose tillage device includes a transmission box 100 , a driving mechanism 200 , a transmission mechanism 300 and a loose tillage tool 400 .

The transmission box 100 is welded by a bottom plate 11 , a top plate 12 and a side plate 13 . A boss 121 is provided in the middle of the top plate 12 .

The drive mechanism 200 is a hydraulic motor or an electric motor. A gearbox 201 is provided between the drive mechanism 200 and the boss 121. The gearbox 201 is installed on the boss 121. As another structure, if the gearbox 201 is not provided , then the driving mechanism 200 is directly installed on the boss 121. The structure of the boss 121 can not only improve the strength of the transmission box connected with the driving mechanism, but also allow the lower end surface of the driving mechanism to have a certain distance from the plane on the top plate, which is convenient Install and remove the drive mechanism 200 .

The transmission mechanism 300 includes a transmission shaft 301 and a gear 302. The transmission shaft 301 is mounted on the transmission box 100 through a bearing. One end of the transmission shaft 301 stretches out from the transmission box 100. On each transmission shaft 301, the gear is installed. 302 , adjacent gears mesh with each other, and the driving mechanism 200 drives one of the transmission shafts to rotate.

As shown in Figures 1 to 3, the plowing tool includes a cutter bar 1, a spiral blade 2, a blade 3, a first soil-entry blade 4, a second soil-entry blade 5, a socket 6, a crushing and leveling blade 7 and a flange 8 .

The cross-section of the cutter bar 1 is circular, and of course it can also be other polygons. Flange 8 is welded on the upper end of cutter bar 1. The flange 8 is connected to the extended end of the transmission shaft.

The helical piece 2 is wound and welded on the middle and lower part of the cutter bar 1. The helical piece 2 can be left-handed or right-handed. A plurality of helical pieces can be welded on the cutter bar 1.

As shown in Figure 3, more than two blades are fixed on the helical sheet 2, and many blades are arranged upwards along the helical sheet sequentially, and the number of blades in different pitches on the same helical sheet is different. In this embodiment, from From bottom to top, the number of blades in different pitches on the same helical piece decreases successively, and the reduction in the number of blades in adjacent pitches is one. In this way, during the loosening process, the blades in the pitch with more blades will The crushing is more sufficient, and the land is more fluffy. On the contrary, the crushing effect and the fluffy degree of the land are relatively poor. For this embodiment, the lower layer of soil is more fluffy, the crushing is more sufficient, and the fluffy performance of the upper layer of land is poor. The crushing effect is relatively poor, so that during the growth of the plant, the root system is easier to grow downward, and the growth performance of the plant is better. In order to obtain different plowing effects, the number of blades on different helical sheets can also be different. The blade 3 includes a fixing part 31 and a blade body 32 bent upward or obliquely upward from the outer end of the fixing part. The helical piece 2 is provided with a first fixing hole 21, and the fixing part 31 is provided with a second fixing hole 33. The bolt 91 in the bolt assembly 9 passes through the first fixing hole 21 and the second fixing hole 33, and utilizes the nut 92 to lock the blade 3; resistance. Blade 3 has soil-cutting blade 34 and knife back 35, and soil-cutting blade 34 is relative to the helical direction of helical plate, and promptly when loose plowing tool rotates, soil-cutting blade 34 chips soil, and knife-back 35 is relatively arranged with soil-cutting blade 34. The middle part of the soil cutting blade 34 protrudes outwards to form an arc, and when the blade 3 is in the soil cutting process, the force that the soil acts on the blade body 32 can be decomposed into the first component force perpendicular to the soil cutting blade and related to the soil cutting blade. The tangential second force component reduces the force of the soil on the blade body 32. On the one hand, it can reduce the bending deformation of the blade 3, reduce the wear and damage of the soil cutting blade 34, and prolong the use of the blade 3. On the other hand, the shear force suffered by the bolt assembly 9 is also reduced, which improves the connection strength between the blade and the helix. The upper surface of the soil-cutting blade 34 is an inclined plane so that the soil-cutting blade is wedge-shaped, and the lower surface of the soil-cutting blade 34 is provided with the first rib 36 extending along the soil-cutting blade. When the soil-cutting blade 34 is wedge-shaped, the blade body can be 32 cut into the soil more easily, also reduced the intensity of blade 3 certainly, for this reason, can improve the intensity of cutting soil blade place by arranging the first rib 36, although meeting between the first rib 36 and the crushed soil There is a certain resistance, but when the crushed soil passes through the first rib 36, the first rib 36 can crush the crushed soil again, which improves the crushing effect.

As shown in Fig. 4 to Fig. 6, the bolt assembly 9 includes a bolt 91 and a nut 92, the bolt 91 passes through the screw piece 2 and the fixing part 31 sequentially from top to bottom, and the bolt head of the bolt 91 sinks in the first fixing hole 21. In the counterbore, the wear and tear of the soil on the bolt head is reduced, and the nut 92 that compresses the blade 3 is threadedly connected to the lower end of the bolt 91; the nut 92 includes a nut 921 and a round head 922 integrated with the nut, and the round head 922 has a carburized layer on the outer surface. When loose plowing tool is loose plowing, the nut 92 will interact with the soil, which will easily cause the nut to wear. If the common nut is used to lock the blade 3, the nut will be worn on the one hand, and the nut on the bolt will be destroyed on the other hand. The nut cannot be disassembled. Therefore, in the present invention, by setting the round head 922, the end of the bolt 91 is hidden in the nut 92 to prevent the thread of the bolt from being damaged. On the other hand, the round head 922 can effectively protect the bolt. The inventive nut 921 avoids early wear and tear of the nut. In order to prevent the nut 92 from being worn early, a carburized layer with higher hardness is provided.

The first inserting blade 4 includes a first connecting portion 41 and a first blade 42, the first connecting portion 41 is connected to the lower end of the spiral piece 2, the lower surface of the first blade 42 has a slope so that the first blade is wedge-shaped, and the first blade 42 The upper surface of the upper surface has an accommodation groove 421, and the first alloy sheet 43 is embedded in the accommodation groove 421. The first soil-entry blade 4 extends obliquely downward, and the lower end of the first soil-entry blade 4 is lower than the bottom surface of the cutter bar 1. In the embodiment, the included angle between the first soil-entrying blade 4 and the central axis of the cutter bar is slightly larger than the helix angle of the helical piece, preferably larger than 1-3°.

The lower end of cutter bar 1 is connected with more than one second soil-entrying blade 5, and in this embodiment, the second soil-entrying blade 5 is one, and the second soil-entrying blade 5 comprises a second connecting portion 51 and a second blade 52, the second Wherein one side of connection part 51 is welded on the cutter bar 1, in order to improve the connection strength between the second soil-entrying blade 5 and the cutter bar 1, a rib plate is welded between the second soil-entrying blade 5 and the cutter bar 1; The lower surface of the 52 has an inclined surface so that the second blade is wedge-shaped, and the upper surface of the second blade 52 has a receiving groove 521, and the second alloy sheet 53 is embedded in the receiving groove 521, and the second soil-entrying blade 5 extends obliquely downward. The lower end of the second soil-burying blade 5 is lower than the bottom surface of the cutter bar 1, and the direction that the second blade 52 extends from the second connecting portion 51 is consistent with the opposite direction of the helical sheet. The angle of inclination is the same.

More than two socket sockets 6 are fixed on the top of the cutter bar 1. The socket sockets 6 extend radially. , the crushing and leveling blade 7 is inserted into the insertion slot 61, and the crushing and leveling blade 7 includes an insertion portion 71, a first bending portion 72 and a second bending portion 73, and the first bending portion 72 is self-inserting The outer end of the portion extends in the same direction as the helix, the second curved portion 73 extends downward from the first curved portion 72 , and a crushing blade 74 is provided on the outside of the crushing and leveling blade 7 . The position corresponding to the crushing blade on the crushing and leveling blade 7 is provided with a second rib (not shown) extending along the crushing blade, which can not only improve the strength of the crushing and leveling blade, but also further The effect of crushing: the end of the second curved portion 73 has a blade, which improves the effect of secondary crushing.

In this embodiment, since the first blade 4 and the second blade 5 are set, the second blade 5 can include multiple blades, and the lower ends of the first blade 4 and the second blade 5 are lower than the cutter bar 1. At the same time, the first burying blade 4 and the second burying blade 5 all extend obliquely downwards, and the inclination angle of the first burying blade 4 and the second burying blade 5 is slightly greater than the helix angle of the helicoid, like this, the plowing cutter is in the When entering the soil, the first soil entry blade 4 and the second soil entry blade 5 cut the soil simultaneously, so that the force on the circumference of the cutter bar 1 is uniform, and it is easy to enter the soil. Therefore, the cutter bar 1 is not prone to deformation and fracture. At the same time, the first The stress of the blade 4 and the second blade 5 is also uniform, the first blade 4 and the second blade 5 are not easily deformed and cracked, the first blade 4 is connected to the spiral piece, and the connection reliability of the second blade is good. The connection reliability of blade 5 and cutter bar 1 is also good; Adopt above-mentioned structure, because the second inserting soil blade 5 only has a small part to be connected with cutter bar 1, after being stressed uniformly, the distance between the second inserting soil blade 5 and cutter bar 1 Stress concentration is not easy to occur at the connection, so the connection strength is high. Because the first alloy sheet 43 and the second alloy sheet 53 are provided, the hardness of the alloy sheet is large, and when the plowing tool is inserted into the soil, the first soil-entry blade 4 and the second soil-entry blade 5 are not easy to wear, especially when the plowing tool goes into the soil When finishing and comminuting the soil horizontally, the first soil-burying blade 4 and the second soil-burying blade 5 are still playing the role of cutting the bottom soil. Generally speaking, the hardness of the soil bottom layer is relatively large, and when the loose plowing cutter cuts the soil horizontally, the first Burying into soil blade 4 and the second soil-burying blade 5 also may bump into stone, therefore, can improve strength more by inlaid alloy sheet, prolong life. Because the blade has the soil cutting blade 34, when the knife bar 1 rotates, the soil cutting blade 34 cuts the soil, which can allow the blade 3 to cut into the soil more easily on the one hand, and can reduce the resistance of the loose tillage tool for lateral cutting on the other hand. Because the crushing and leveling blade 7 of the structure of the present invention is set, the vertical dislocation of the crushing and leveling blade 7 is arranged, and there is a gap between the adjacent crushing and leveling blades, so that when the soil after the loose plowing is leveled, each crushing and leveling The blades are leveled in layers. When the cutter bar 1 is rotating, the crushed soil will flow between the crushing and leveling blades, thereby greatly reducing the leveling resistance, and the leveling effect is good, which can effectively prevent crushing The phenomenon of soil heaving occurs, and the second curved portion 73 has a raking effect on the soil, which further improves the leveling effect. Because the pulverizing blade 74 is provided, the pulverizing blade 74 basically extends laterally, and has a second curved portion 73, so that the pulverized soil can be pulverized twice, and the resistance of pulverizing the soil can be reduced.

Claims (1)

1. A loose tillage device, comprising a transmission box, is provided with more than one transmission shaft in the transmission box, and one end of the transmission shaft stretches out from the transmission box, and is connected with a loose tillage cutter at the extended end of the transmission shaft; described loose tillage cutter It includes the knife rod, the spiral piece wound on the knife pole and the blade installed on the spiral piece; it is characterized in that the number of blades on different spiral pieces is different, and the number of blades in different pitches on the same spiral piece is different, from bottom to top, The number of blades in different pitches on the same helical piece decreases successively, and the reduction in the number of blades in adjacent pitches is one; the blade includes a fixed part and a blade body that is bent upward or obliquely upward from the outer end of the fixed part , the fixing part is fixed on the spiral sheet through a bolt assembly; the bolt assembly includes a bolt and a nut, and the bolt passes through the spiral sheet and the fixing part sequentially from top to bottom, and a nut for pressing the blade is threadedly connected to the lower end of the bolt; The nut includes a nut and a round head integrated with the nut. The outer surface of the round head has a carburized layer; Relatively arranged, the middle part of the soil cutting blade protrudes outwards to form an arc, the upper surface of the soil cutting blade is an inclined plane so that the soil cutting blade is wedge-shaped, and the lower surface of the soil cutting blade is provided with a first rib extending along the soil cutting blade The lower end of the spiral sheet is fixed with a first soil-entry blade; the first soil-entry blade includes a first connection portion and a first blade, the first connection portion is connected to the lower end of the spiral sheet, and the lower surface of the first blade has a slope so that the first blade It is wedge-shaped, and the upper surface of the first knife edge has an accommodation groove, and the first alloy sheet is embedded in the accommodation groove, and the first soil-entry blade extends obliquely downward, and the lower end of the first soil-entry blade is lower than the bottom surface of the knife bar; The lower end of the bar is connected with more than one second soil-entrying blade, and a rib plate is welded between the second soil-entrying blade and the cutter bar. The second soil-entrying blade includes a second connecting portion and a second blade, and the second connecting portion is connected to the cutter bar. Above, the lower surface of the second blade has a bevel so that the second blade is wedge-shaped, and the upper surface of the second blade has a receiving groove, and a second alloy sheet is embedded in the receiving groove, and the second soil inserting blade extends obliquely downward. The lower end of the two soil-entry blades is lower than the bottom surface of the cutter bar, and the direction in which the second blade extends from the second connecting portion is consistent with the direction in which the helical sheet rotates in the opposite direction; The included angle between the blade and the central axis of the cutter bar is 1° to 3° greater than the helix angle of the helical sheet, and the included angle between the second soil-entrying blade and the central axis of the cutter bar is 1° to 3° larger than the helical angle of the helical sheet; on the upper part of the cutter bar More than two sockets are fixed, the sockets extend radially, and the sockets are arranged in a dislocation in the axial direction of the cutter bar. The flat blade, the crushing and leveling blade includes an insertion part, a first bending part and a second bending part, the first bending part extends from the outer end of the insertion part to the same direction as the spiral piece, and the second bending part The portion extends downwards from the first curved portion, and a crushing blade is provided on the outside of the crushing and leveling blade, and a second rib extending along the crushing blade is provided at a position corresponding to the crushing blade on the crushing and leveling blade.