Straw smashing, rotary plowing and burying integrated machine

Abstract

The application discloses a straw smashing, rotary ploughing, mixing and burying integrated machine, which comprises a rack, a power output mechanism arranged above the rack, a straw smashing mechanism arranged at the lower part of the rack, a transverse rotating shaft connected with the power output mechanism, a transverse bevel gear connected with the transverse rotating shaft, a longitudinal bevel gear engaged with the transverse bevel gear, a longitudinal rotating shaft on which the longitudinal bevel gear is arranged, a power output gear arranged below the longitudinal rotating shaft, a gear engaged with the power output gear, and a smashing cutter shaft on which a plurality of groups of sawtooth blade groups are arranged in intervals from top to bottom. The straw smashing mechanism adopts a downward transmission mode and is flush with the ground, so that the normal operation of the cutter shaft can be ensured to the greatest extent; the cutter shaft is fixed at the upper end and the lower end simultaneously, so that the cutter shaft will not be deviated after long-term operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural machinery, and relates to a straw returning to field equipment, in particular to a straw smashing, rotary plowing, mixing and burying integrated machine. BACKGROUND

[0002] The straw returning to field technology has become a common measure for increasing yield by fertilizing the soil. At present, there are several ways to deal with straw: burning in situ, bundling and leaving the field, and returning to the field. The main ways of returning to the field at present are direct smashing, root stubble rotary plowing, plowing, and whole stalk burying. Direct smashing of straw is to smash the straw in the field by high-speed rotating smashing components, and directly throw it on the ground. Since it is not buried, the fertilizer effect of straw returning to the field is limited. Root stubble rotary plowing cuts the crop root stubble and breaks the soil by rotary plow, but since the main function of the rotary plow is to break the soil and roots, it is not designed to cut the stubble, resulting in long and uneven length of the straw, and even some straw is not processed, which also affects the burying effect. Plowing is to pull the plow by the tractor to flip the soil and bury the straw under the soil. The disadvantage of this method is that when the length of the straw is too long, the part of the straw that exceeds the plowing depth stays on the surface of the gap between the soil, and cannot be buried. Flipping the soil will also cause some root stubble to be brought to the surface. Whole stalk burying does not smash the straw, but buries the whole stalk in the soil by mechanical components. It is not suitable for straw with thick stems such as rape.

[0003] The published patent "Straw and Root Stubble Smashing and Burying Machine for Returning to Field" (Publication No. CN108575276A) has the following disadvantages in actual application:

[0004] (1) The smashing device adopts an upper drive mode. When the upper drive mode is adopted, there is no support below the smashing knife shaft. If a collision with hard objects such as stones occurs during operation, the smashing knife shaft is prone to breakage and other adverse conditions;

[0005] (2) The smashing knife shaft is fixed only at the upper end, and is rotated by bearings. For the rotation of the knife shaft, this mode is not conducive to the long-term operation of the knife shaft, and is prone to shaft center deviation and other adverse conditions;

[0006] (3) The burying device adopts a spiral burying blade, which is only one set and has the same rotation direction. Since the spiral burying blade is installed only on the outer periphery with a large radius, it is subjected to a large radial force during burying operation, which makes the spiral blade prone to wear and breakage, and is not conducive to the uniform mixing and burying of straw and soil;

[0007] (4) The spiral blades have the same rotation direction, which will cause the straw and soil to be buried and thrown in the same direction, which is not conducive to the uniform mixing and burying of straw and soil. SUMMARY

[0008] To solve the problems in the prior art, the present application aims to provide a straw crushing rotary tillage mixing and burying integrated machine, which can cut long straw into small pieces under the operation of a straw crushing mechanism, which is conducive to subsequent burying into the soil, and adopts a downward transmission mode to avoid the offset or fracture of the crushing cutter shaft; under the operation of a root stubble crushing mechanism, the root stubble of the straw is broken and the soil is turned over to prepare for subsequent burying operation; the straw-root stubble burying mechanism adopts bidirectional reverse spiral opposite burying rollers, which are convenient for convection mixing and shear mixing, and the straw and the soil can complete the uniform mixing operation under the action of the burying cutter rollers, thereby enhancing the burying effect and being conducive to increasing the fertility effect of the straw on the soil.

[0009] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0010] A straw crushing rotary tillage mixing and burying integrated machine, comprising a rack, a side plate is arranged on the side of the rack, the side plate comprises left and right side plates placed left and right, a soil blocking cover and a cross beam are arranged above the rack, a soil leveling plate is arranged at the rear of the rack, a rib plate is connected to the inner side of the left and right side plates, the soil blocking cover is fixed with the cross beam, the soil leveling plate is connected with the rib plate, the cross beam is connected with the rib plates on both sides at the two ends, a power output mechanism is arranged above the rack, a straw crushing mechanism is arranged at the lower part of the rack, the straw crushing mechanism comprises a transverse rotating shaft connected with the power output mechanism, a transverse bevel gear is connected to the transverse rotating shaft, the transverse bevel gear is engaged with a longitudinal bevel gear, the longitudinal bevel gear is installed on a longitudinal rotating shaft, and a power output gear is installed at the lower part of the longitudinal rotating shaft.

[0011] The power output gear is engaged with a gear, the gear is installed at the lower part of the crushing cutter shaft, the gears installed on the adjacent crushing cutter shafts are engaged through transmission gears, and a plurality of groups of sawtooth blade groups are connected to the crushing cutter shaft in intervals from top to bottom.

[0012] Optionally, the upper end of the crushing cutter shaft is fixed through a first bearing, a second bearing, a top bearing seat and an external upper end cover, the lower end is fixed through a third bearing, a fourth bearing, a bottom bearing seat and an external lower end cover, and is driven to rotate through a gear.

[0013] Optionally, the sawtooth blade group comprises a disc-shaped cutter disc and a plurality of sawtooth blades fixed on the cutter disc, the adjacent sawtooth blades on the same cutter disc have equal included angles, and the sawtooth blades between adjacent crushing cutter shafts are arranged in equal distance and staggered.

[0014] Further, a cutter groove is arranged on the cutter disc, and the sawtooth blades are connected with the cutter disc at the cutter groove, so that the sawtooth blades form an angle with the ground.

[0015] Optionally, a root stub crushing mechanism is arranged at the lower part of the frame and behind the straw crushing mechanism.

[0016] The root stub crushing mechanism comprises a rotary tiller shaft, a root stub crushing carrier roller connected with the rotary tiller shaft, and a rotary tiller seat fixed on the surface of the root stub crushing carrier roller.

[0017] The rotary tiller seat is provided with rotary tiller curved knives, which comprise left rotary tiller curved knives and right rotary tiller curved knives, and the left rotary tiller curved knives and the right rotary tiller curved knives are symmetrically arranged in double helical lines.

[0018] Optionally, a straw-root burying mechanism is arranged below the frame and behind the root stub crushing mechanism.

[0019] The straw-root burying mechanism comprises a burying knife shaft, a burying carrier roller, burying knife seats, and spiral burying knife pieces, and the burying carrier roller is connected with the burying knife shaft.

[0020] The spiral burying knife pieces are connected with the burying knife seats, the burying knife seats are symmetrically installed, and are tightly connected with the surface of the burying carrier roller through bolts.

[0021] The spiral burying knife pieces are double spiral burying knife pieces inside and outside, which comprise left and right symmetrically installed inner left spiral burying knife pieces and inner right spiral burying knife pieces, and outer left spiral burying knife pieces and outer right spiral burying knife pieces.

[0022] Optionally, the power output shaft mechanism comprises an intermediate gear box fixed above the soil retaining cover and a side gear box fixed on the left side plate.

[0023] A universal joint transmission shaft is connected between the intermediate gear box and the side gear box, and the intermediate gear box transmits power to the side gear box through the universal joint transmission shaft.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] (1) The pulverizing cutter shaft of the straw pulverizing mechanism is driven by the straight gears in sequence to drive the rotation of the pulverizing cutter shaft, the pulverizing cutter shaft drives the rotation of the cutter head through the pin key, the cutter head drives the rotation of the saw blade, the saw blades on the adjacent pulverizing cutter shafts act on the same straw to uniformly pulverize the straw, and the pulverized straw is directly thrown on the ground, and the pulverizing effect is excellent. Compared with the published patent, the transmission mode of the straw pulverizing mechanism in the application adopts downward transmission, the gearbox composed of the lower box body and the internal gear, the transmission gear, the power output gear, the longitudinal bevel gear, the transverse bevel gear, the transverse shaft and the longitudinal shaft is arranged below the cutter shaft and is flush with the ground, which can ensure the normal operation of the cutter shaft to a great extent. When hard objects such as stones are encountered, the gearbox collides with the objects, without affecting the rotation of the cutter shaft, and the cutter shaft will not be broken. At the same time, in the application, the upper and lower ends of the cutter shaft are fixed at the same time, which is beneficial to ensure the perpendicularity of the cutter shaft during rotation and prevent the cutter shaft from deviating after long-term operation.

[0026] (2) The straw pulverizing and rotary tillage mixed burying all-in-one machine of the application pulverizes the crop straw in the field through the high-speed rotating straw pulverizing mechanism, the length of the cut straw is small and uniform, the small section of straw above the soil and the root stubble under the ground are pulverized through the root stubble pulverizing mechanism, and the soil is pulverized at the same time, the straw-root stubble-soil mixture is uniformly mixed through the straw-root stubble burying mechanism, the burying effect is remarkable, and good soil conditions are provided for subsequent seeding operation, which solves the technical problem that the straw mechanical field returning cannot simultaneously effectively realize straw pulverizing, root stubble pulverizing and straw-root stubble burying.

[0027] (3) The burying cutter shaft of the straw-root stubble burying mechanism drives the rotation of the spiral burying blade, the inner and outer spiral blades enter the soil from different directions and throw the soil in different directions during operation, so that the straw-root stubble-soil mixture is extremely uniform. In the application, the bidirectional reverse spiral opposite burying roller is adopted, and the working principle of the double spiral ring belt is mainly convection mixing. The double spiral blade includes inner and outer spiral blades, the rotation directions of the inner and outer spiral blades are opposite, when the cutter roller rotates, the soil and the straw move relatively, the materials penetrate and displace each other, and the convection effect is good. When the cutter roller rotates, the inner and outer spiral blades enter the soil or throw the soil in the opposite direction, so that natural diffusion mixing is formed. At the same time, the rotation radii of the inner and outer spiral blades are different, so the movement directions of the soil and the straw are different, thereby causing the effect of shear mixing, and the uniform mixing and burying of the soil and the straw are completed.

[0028] (4) The rotary tillage cutter shaft of the root stubble pulverizing mechanism drives the rotation of the rotary tillage curved blade, the root stubble is pulverized, the soil is tilled, and the length of the pulverized root stubble is short and uniform. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0030] Figure 1 is a schematic diagram of the overall structure of the present application;

[0031] Figure 2 is a schematic diagram of the side view structure of the present application; Figure 1

[0032] Figure 3 is a schematic diagram of the structure of the straw crushing mechanism in the present application; Figure 1

[0033] Figure 4 is a schematic diagram of the vertical transmission structure of the straw crushing mechanism in the present application; Figure 1

[0034] Figure 5 is a schematic diagram of the structure of the root stub crushing mechanism in the present application; Figure 1

[0035] Figure 6 is a schematic diagram of the three-dimensional structure of the straw-root stub burying mechanism in the present application; Figure 1

[0036] Figure 7 is a front view of the straw-root stub burying mechanism in the present application; Figure 6

[0037] Figure 8 is a schematic diagram of the working process of the present application; Figure 1

[0038] Figure 9 is a schematic diagram of the transmission system structure in the present application. Figure 1 DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0040] As Figure 1 , Figure 2 ​​​​​​​​As shown, a straw crushing rotary tillage mixed burying integrated machine, including rack 35 and suspension frame 4, suspension frame 4 is connected with rack 35 through bolt, suspension frame 4 is connected with tractor in front of whole machine, forms three point suspension, thereby drives whole machine to advance, rack 35 top is provided with power output mechanism 36, rack 35 below is provided with straw crushing mechanism 10, root stubble crushing mechanism 11 and straw-root stubble burying mechanism 12.Rack 35 side is provided with side plate 42, side plate 42 includes left side plate 9 and right side plate 1 placed left and right, rack 35 top is provided with soil shield 3, crossbeam 2, rack 35 rear is provided with land leveling support plate 34.Left side plate 9 and right side plate 1 inner side bolt connection has rib plate 43, soil shield 3 is welded with crossbeam 2, land leveling support plate 34 is bolted with rib plate 43, crossbeam 2 both ends are welded with both sides rib plate 43 respectively.Power output mechanism 36 includes middle gear box 5 fixed on soil shield 3 top through bolt, and side gear box 8 fixed on left side plate 9 through bolt;Universal joint transmission shaft 7 is connected between middle gear box 5 and side gear box 8, middle gear box 5 transmits power to side gear box 8 through universal joint transmission shaft 7.

[0041] As Figure 3 、 Figure 4 Shown, straw crushing mechanism 10 includes transverse rotating shaft 37 connected with the internal gear of side gear box 8 of power output mechanism 36, transverse rotating shaft 37 is connected with a transverse bevel gear 21, transverse bevel gear 21 is engaged with longitudinal bevel gear 20, to change the rotation direction of power, changes transverse power output into longitudinal power output, longitudinal bevel gear 20 is installed on longitudinal rotating shaft 38, longitudinal rotating shaft 38 below is installed with power output gear 19, power output gear 19 is engaged with gear 18, gear 18 is installed in lower part of crushing knife shaft 13, thereby drives crushing knife shaft to rotate, gear 18 is engaged with transmission gear 44, transmission gear 44 is fixed through upper and lower bearing seat and intermediate shaft installed in lower box body 53, and is installed similarly with power output gear 19, this transmission gear 44 is engaged with subsequent gear 18 again, thereby drives subsequent crushing knife shaft to rotate, transmission gear 44 and gear 18 are staggered in turn, thereby transmits power, that is, there is a transmission gear 44 between adjacent gear 18, thereby sequentially transmits power of power output mechanism 36 to crushing knife shaft 13.

[0042] As Figure 3 、 Figure 4As shown, the pulverizing knife shaft 13 has a sealing space above it, which is formed by four panels and left and right side plates 9 and 1, the upper end of the pulverizing knife shaft 13 is fixed axially by a first bearing 46, a second bearing 47, a top bearing seat 48 of the sealing space and an external upper end cover 45, the lower end is fixed by a third bearing 50, a fourth bearing 51, a bottom bearing seat 49 and an external lower end cover 52, and is driven to rotate by the gear 18. A plurality of groups of sawtooth blade groups 41 are fixedly connected to the pulverizing knife shaft 13 from top to bottom. The sawtooth blade group 41 comprises a disc-shaped cutter 14 and six sawtooth blades 15 fixed on the cutter 14, the included angles of adjacent sawtooth blades on the same cutter 14 are equal, and the sawtooth blades 15 between adjacent pulverizing knife shafts 13 are arranged in a staggered manner. The cutter 14 is provided with a cutter groove 16, the sawtooth blade 15 and the cutter 14 are fixedly connected at the cutter groove 16 by bolts, the blade body and the blade tail of the sawtooth blade 15 form a certain angle, and the blade tail is connected to the cutter 14 by bolts, so that the blade body forms a certain inclination angle with the ground. The straw pulverizing mechanism transmission mode of the application adopts a transmission from below, and the gearbox composed of a lower box body 53 and internal gears 18, transmission gears 44, power output gears 19, longitudinal bevel gears 20, transverse bevel gears 21, transverse shafts 37 and longitudinal shafts 38 is below the cutter shaft and flush with the ground, which can ensure the normal operation of the cutter shaft to the greatest extent. When hard objects such as stones collide with the gearbox, the rotation of the cutter shaft will not be affected, and the cutter shaft will not be broken. At the same time, the cutter shaft is fixed at both ends, which is beneficial to ensure the perpendicularity of the cutter shaft during rotation and prevent the cutter shaft from deviating after long-term operation.

[0043] As shown in the figure, Figure 5 The root stub pulverizing mechanism 11 is composed of a rotary tillage knife shaft 26, a root stub pulverizing roller 25, a rotary tillage knife seat 22 and a rotary tillage curved knife 39, the rotary tillage knife shaft 26 is connected with the internal gear of the side gear gearbox 8 of the power output mechanism 36, the root stub pulverizing roller 25 is connected with the rotary tillage knife shaft 26 by bolts, the rotary tillage knife seat 22 is welded on the surface of the root stub pulverizing roller 25, and the rotary tillage curved knife 39 is connected with the rotary tillage knife seat 22 by bolts. The rotary tillage curved knife 39 includes a left rotary tillage curved knife 24 and a right rotary tillage curved knife 23, which are arranged in a symmetrical manner according to a double-head spiral line.

[0044] As shown in the figure, Figure 6 , Figure 7As shown, the straw-root stubble burying mechanism 12 is composed of a burying knife shaft 33, a burying carrier roller 31, a burying knife seat 32 and a spiral burying knife 40. The burying carrier roller 31 is connected with the burying knife shaft 33 through bolts, and the burying knife shaft 33 is connected with the internal gear of the side gear transmission box 8 of the power output mechanism 36. The spiral burying knife 40 is a double spiral burying knife with inner and outer spirals, which includes an inner left spiral burying knife 28, an inner right spiral burying knife 27, an outer left spiral burying knife 29 and an outer right spiral burying knife 30. The spiral burying knife 40 is welded with the multiple burying knife seats 32, which are symmetrically installed and tightly connected with the surface of the burying carrier roller 31 through bolts to prevent the burying knife seat 32 from moving in the axial direction. Specifically, the installation of the spiral burying knife 40 on the whole burying carrier roller 31 is left-right symmetrical. Taking one side as an example, there are 4 groups of burying knife seats 32, and 3 groups of spiral burying knives 40 are installed. The pitch of the inner left spiral burying knife 28 and the inner right spiral burying knife 27 is one third of the total length of the burying carrier roller 31, and the installation radius is small, which are sequentially welded on the burying knife seat 32, i.e. 1.5 turns of the inner spiral burying knife are installed on one side. The installation pitch of the outer left spiral burying knife 29 and the outer right spiral burying knife 30 is one third of the total length of the burying carrier roller 31, and the installation radius is large, which are sequentially welded on the burying knife seat 32, i.e. 1.5 turns of the outer spiral burying knife are installed on one side.

[0045] The working process of the straw crushing rotary tillage mixing and burying all-in-one machine is as follows: Figure 8 、 Figure 9As shown, during operation, the tractor transmits power to the intermediate gear box 5 through the universal joint, the intermediate gear box 5 transmits power to the side gear box 8 through the universal joint transmission shaft 7, the side gear box 8 transmits power to the transverse rotating shaft 37, the transverse rotating shaft 37 drives the longitudinal rotating shaft 38 to rotate through the engagement of the transverse bevel gear 21 and the longitudinal bevel gear 20, the longitudinal rotating shaft 38 drives the gears 18 on the plurality of pulverizing shafts to rotate through the power output gear 19, the gears 18 on the pulverizing shafts drive the respective pulverizing shafts 13 to rotate, the pulverizing shafts 13 drive the sawtooth blade groups 41 to rotate, the sawtooth blade groups 41 on the adjacent pulverizing shafts 13 act on the same straw to uniformly pulverize the straw, and the pulverized straw is directly thrown onto the ground surface. At the same time, during operation, the side gear box 8 transmits power to the rotary tiller shaft 26, the rotary tiller shaft 26 drives the rotary tiller blade 39 to rotate to pulverize the roots and stubble while tilling the soil. In addition, during operation, the side gear box 8 transmits power to the burying blade shaft 33, the burying blade shaft 33 drives the spiral burying blade 40 to rotate, the inner and outer blades of the spiral burying blade 40 enter the soil from different directions and throw the soil in different directions during operation, thereby uniformly mixing the straw, roots and soil.

[0046] The above describes the preferred embodiments of the present application, and of course cannot limit the scope of protection of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and changes can be made, and these improvements and changes are also considered to be within the scope of protection of the present application.

Claims

1. A straw crushing and rotary tillage mixed burying integrated machine, comprising a rack (35), the rack (35) is provided with side plates (42) on the side, the side plates (42) comprise left side plates (9) and right side plates (1) placed left and right, the rack (35) is provided with a soil retaining cover (3) and a cross beam (2) above, the rack (35) is provided with a land leveling supporting plate (34) behind, the left side plates (9) and the right side plates (1) are connected with rib plates (43) inside, the soil retaining cover (3) is fixed with the cross beam (2), the land leveling supporting plate (34) is connected with the rib plates (43), the cross beam (2) is connected with the rib plates (43) on both ends, characterized in that, the rack (35) is provided with a power output mechanism (36) above, the rack (35) is provided with a straw crushing mechanism (10) below, the straw crushing mechanism (10) comprises a transverse rotating shaft (37) connected with the power output mechanism (36), a transverse bevel gear (21) is connected on the transverse rotating shaft (37), the transverse bevel gear (21) is engaged with a longitudinal bevel gear (20), the longitudinal bevel gear (20) is installed on a longitudinal rotating shaft (38), a power output gear (19) is installed on the lower part of the longitudinal rotating shaft (38); the power output gear (19) is engaged with a gear (18), the gear (18) is installed on the lower part of a crushing blade shaft (13), adjacent gears (18) installed on the crushing blade shaft (13) are engaged through a transmission gear (44), a plurality of sets of sawtooth blade groups (41) are connected on the crushing blade shaft (13) from top to bottom; it further comprises a straw and root burying mechanism (12) arranged below the rack (35) and behind the root crushing mechanism (11); the straw and root burying mechanism (12) comprises a burying blade shaft (33), a burying supporting roller (31), a burying blade seat (32) and a spiral burying blade (40), the burying supporting roller (31) is connected with the burying blade shaft (33); the spiral burying blade (40) is connected with a plurality of burying blade seats (32), the burying blade seats (32) are symmetrically installed and are tightly connected with the surface of the burying supporting roller (31) through bolts; the spiral burying blade (40) is an inner and outer double spiral burying blade, which comprises an inner left spiral burying blade (28) and an inner right spiral burying blade (27) symmetrically installed, an outer left spiral burying blade (29) and an outer right spiral burying blade (30); the sawtooth blade group (41) comprises a disc-shaped blade disc (14) and a plurality of sawtooth blades (15) fixed on the blade disc (14).

2. The straw smashing, rotary tillage, mixing and burying all-in-one machine according to claim 1, characterized in that, the upper end of the crushing blade shaft (13) is fixed through a first bearing (46), a second bearing (47), a top bearing seat (48) and an outer upper end cover (45), the lower end is fixed through a third bearing (50), a fourth bearing (51), a bottom bearing seat (49) and an outer lower end cover (52), and is driven to rotate through the gear (18).

3. The straw smashing, rotary tillage, mixing and burying integrated machine according to claim 1, characterized in that, The included angles of adjacent sawtooth blades on the same blade disc (14) are equal, and the sawtooth blades (15) between adjacent crushing blade shafts (13) are arranged equidistantly and staggered.

4. The straw smashing, rotary tillage, burying and integrating all-in-one machine according to claim 3, characterized in that, The cutter head (14) is provided with a cutter groove (16), and the sawtooth blade (15) is connected with the cutter head (14) at the cutter groove (16), so that the sawtooth blade (15) is inclined to the ground.

5. The straw smashing, rotary tillage, mixing and burying integrated machine according to claim 1, characterized in that, The root stub crushing mechanism (11) is arranged at the lower part of the frame (35) and behind the straw crushing mechanism (10). The root stub crushing mechanism (11) comprises a rotary tillage cutter shaft (26), a root stub crushing carrier roller (25) connected with the rotary tillage cutter shaft (26), and a rotary tillage cutter seat (22) fixed to the surface of the root stub crushing carrier roller (25). The rotary tillage cutter seat (22) is provided with a rotary tillage curved cutter (39), and the rotary tillage curved cutter (39) comprises a left rotary tillage curved cutter (24) and a right rotary tillage curved cutter (23).

6. The straw smashing, rotary tillage, mixing and burying all-in-one machine according to claim 1, characterized in that, The power output mechanism (36) comprises an intermediate gear transmission box (5) fixed above the soil retaining cover (3) and a side gear transmission box (8) fixed on the left side plate (9). The intermediate gear transmission box (5) and the side gear transmission box (8) are connected with a universal joint transmission shaft (7), and the intermediate gear transmission box (5) transmits power to the side gear transmission box (8) through the universal joint transmission shaft (7).

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