Quick coupling device for a rotary cultivator suspension

Abstract

The utility model relates to rotary cultivator suspension frame technical field, and disclose quick connecting device of rotary cultivator suspension frame, including rotary cultivator cutter seat and connecting frame, the middle part fixed mounting of rotary cultivator cutter seat has two suspension frame bodies, the both sides end of suspension frame body all through the opening of two assembly holes, through servo motor drive adjusting screw rod rotation, cooperation slide and the threaded connection of adjusting screw rod and the sliding limit of slide along the connecting frame, can drive concave plate to realize stable height adjustment, make concave plate can accurate adaptation different height's suspension frame body, need not to pad high equipment, can quickly eliminate the height difference between suspension frame body and concave plate, let suspension frame body's assembly hole and concave plate's connecting hole fast alignment, significantly reduced the operation step and time consumption in the hole position alignment process, greatly promoted the convenience and efficiency of rotary cultivator suspension frame assembly, guarantee the safety and stability of assembly operation.

Description

Technical Field

[0001] This utility model relates to the field of rotary tiller suspension frame technology, and in particular to a quick connection device for rotary tiller suspension frames. Background Technology

[0002] In agricultural tillage and land preparation systems, rotary tillers, as agricultural machinery integrating power transmission, soil breaking, and surface leveling, are essentially driven by power equipment such as tractors. This power, transmitted through a transmission system, drives the cutter shaft assembly to rotate at high speed. The rotary blades on the cutter shaft cut, break, and till the soil, while the rear trailer provides initial leveling, laying the foundation for subsequent planting, transplanting, and other agricultural operations. The cutter holder, a key load-bearing component connecting the rotary tiller body to the cutter shaft assembly, is primarily fixed via a suspension frame structure that connects to the tiller body. It provides stable mounting support for the cutter shaft assembly and transmits the torque generated by the power system. Typically used in conjunction with the rotary tiller's transmission box, main beam, and other components, it is a core component ensuring normal operation of the rotary tiller and improving soil tillage quality. During the production, assembly, and pre-field debugging of rotary tillers, the installation and disassembly of the cutter head and the tiller body are crucial for ensuring the overall performance of the rotary tiller. The currently common method in the industry for connecting the cutter head to the body involves aligning the holes in the suspension bracket on the cutter head with the corresponding holes on the rotary tiller body, and then using pins to secure it. However, this method presents some problems during actual assembly. Rotary tillers are mostly used in fields where the flatness of the ground varies greatly. When assembling the blade holder and the machine body, the uneven ground can cause height differences at the connection between the blade holder suspension frame and the machine body, making it difficult to quickly align the holes. Workers need to repeatedly adjust the position of the blade holder or the machine body, and may even need to use external support tools to raise the equipment, which increases the complexity of the assembly operation. The entire assembly process is cumbersome and time-consuming, which seriously affects the field deployment efficiency of rotary tillers and makes it difficult to meet the demand for rapid equipment assembly in agricultural production where time is of the essence and deadlines are tight. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a quick-connect device for the rotary tiller suspension frame.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a quick connection device for a rotary tiller suspension frame, comprising a rotary tiller blade holder and a connecting frame, wherein two suspension frame bodies are fixedly installed in the middle of the rotary tiller blade holder, and two assembly holes are opened through one end of each suspension frame body; a slide is slidably provided on the inner side of the connecting frame, and a concave plate is hinged in the middle of the slide; two connecting holes are opened through both ends of the concave plate, and the diameter of the connecting holes is equal to that of the assembly holes. A threaded hole is provided through the middle of the slide block. An adjusting screw is rotatably installed in the middle of the inner side of the connecting frame. A servo motor is installed at the outer end of the connecting frame. The output end of the servo motor is connected to the end of the adjusting screw through a coupling. The slide block is threaded to the surface of the adjusting screw through a threaded hole. T-shaped rods are fixedly installed at both ends of the concave plate. A worm gear is fixedly installed at the end of one of the T-shaped rods. A worm is meshed with the side of the worm gear.

[0005] Preferably, both T-shaped rods extend through to the outer side of the concave plate, and the through connection between the T-shaped rods and the concave plate is a rotatable connection.

[0006] Preferably, a transmission box three is fixedly installed on the side of the concave plate, the worm gear and worm are located inside the transmission box three, both ends of the worm are rotatably installed on the inner end of the transmission box three, and the end of the worm extends through to the outer side of the transmission box three and is provided with a hexagonal bolt hole.

[0007] Preferably, both ends of the inner side of the connecting frame are fixedly installed with protrusions, and both ends of the slide are provided with grooves that match the protrusions. The slide is slidably installed inside the connecting frame through the grooves.

[0008] Preferably, the assembly hole and the connecting hole are provided with pins, and the ends of the two suspension bracket bodies are located on the inner side of the concave plate.

[0009] Preferably, the pin passes through one side of the concave plate and extends to the other end of the concave plate after passing through the mounting hole at the end of the suspension frame body, and a fixing screw is installed on the internal thread of one end of the pin.

[0010] Preferably, a cutter shaft assembly is rotatably mounted on the inner side of the rotary tiller cutter holder, and a rear drag plate is hinged to one side of the rotary tiller cutter holder.

[0011] Preferably, a transmission box one is installed in the middle of the rotary tiller blade holder, and main beam rods are installed at both ends of the transmission box one. A transmission box two is installed on the side of the rotary tiller blade holder. The transmission box two is connected to the transmission box one through the main beam rods, and the blade shaft assembly is connected to the transmission box two.

[0012] In summary, this utility model has the following beneficial effects: 1. This utility model uses a servo motor to drive the adjusting screw to rotate. With the threaded connection between the slide and the adjusting screw and the sliding limit of the slide along the connecting frame, it can drive the concave plate to achieve stable height adjustment. This allows the concave plate to accurately fit the suspension frame body of different heights. Without the need for shims, the height difference between the suspension frame body and the concave plate can be quickly eliminated. This allows the mounting holes of the suspension frame body to be quickly aligned with the connecting holes of the concave plate. This significantly reduces the operation steps and time consumption in the hole alignment process, greatly improves the convenience and efficiency of rotary tiller suspension frame assembly, and ensures the safety and stability of assembly operation. 2. This utility model features a transmission box three on the side of the concave plate. An external hexagonal wrench rotates the hexagonal bolt hole to rotate the worm gear. The meshing transmission between the worm gear and the worm wheel drives the T-shaped rod to rotate. Combined with the hinged connection between the concave plate and the slide block, the angle of the concave plate can be flexibly and finely adjusted to accommodate differences in the angle of the suspension frame body. When the rotary tiller blade holder is tilted, this structure can quickly adapt to the angle difference of the suspension frame body. Without requiring the operator to move the heavy rotary tiller blade holder, the suspension frame body and the concave plate remain in close alignment, ensuring that the pin passes smoothly through the assembly hole and connection hole for fixation. This improves the adaptability and flexibility of the suspension frame connection. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the rotary tiller blade holder structure of this utility model; Figure 3 This is a top view structural diagram of the rotary tiller blade holder and connecting frame assembly of this utility model; Figure 4 This is a schematic diagram of the exploded separation structure of the suspension frame body and the concave plate of this utility model; Figure 5 This is a schematic diagram of the inner structure of the connecting frame of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the inner side of the slide and the three sides of the transmission box of this utility model.

[0014] Figure label: 1. Rotary tiller blade holder; 101. Rear trailer plate; 102. Blade shaft assembly; 2. Transmission box one; 201. Main beam rod; 202. Transmission box two; 3. Suspension bracket body; 301. Assembly hole; 4. Connecting bracket; 401. Protrusion; 5. Slide; 501. Groove; 502. Screw hole; 503. Servo motor; 504. Adjusting screw; 6. Concave plate; 601. Connecting hole; 602. T-shaped rod; 7. Pin; 701. Fixing screw; 8. Transmission box three; 801. Worm gear; 802. Worm; 803. Hex bolt hole. Detailed Implementation

[0015] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings: Example: Reference Figures 1-6 The quick-connect device for the rotary tiller suspension frame includes a rotary tiller blade holder 1 and a connecting frame 4. Two suspension frame bodies 3 are fixedly installed in the middle of the rotary tiller blade holder 1. Two assembly holes 301 are opened through one end of each suspension frame body 3. A slide block 5 is slidably provided on the inner side of the connecting frame 4. A concave plate 6 is hinged in the middle of the slide block 5. Two connecting holes 601 are opened through both ends of the concave plate 6. The diameter of the connecting holes 601 is equal to that of the assembly holes 301. A threaded hole 502 is provided through the middle of the slide block 5. An adjusting screw 504 is rotatably installed in the middle of the inner side of the connecting frame 4. A servo motor 503 is installed at the outer end of the connecting frame 4. The output end of the servo motor 503 is connected to the end of the adjusting screw 504 through a coupling. The slide block 5 is threadedly connected to the surface of the adjusting screw 504 through the threaded hole 502. T-shaped rods 602 are fixedly installed at both ends of the concave plate 6. A worm gear 801 is fixedly installed at the end of one of the T-shaped rods 602. A worm 802 is meshed with the side of the worm gear 801.

[0017] Specifically: In actual use, the suspension frame body 3 is set to connect the rotary tiller blade holder 1 and the concave plate 6. The assembly hole 301 at its end cooperates with the connection hole 601 of the concave plate 6 to provide a positioning basis for the precise docking of the two. Moreover, the equal hole diameters of the two can ensure the smooth installation of the connecting parts.

[0018] The connecting frame 4 serves as a support structure for the slide block 5, providing a stable track for the sliding of the slide block 5. The slide block 5 is designed to support the concave plate 6 on one hand, and to achieve position adjustment through cooperation with the adjusting screw 504 on the other hand. The screw hole 502 of the slide block 505 forms a threaded transmission with the adjusting screw 504, converting the rotational motion of the adjusting screw 504 into the linear motion of the slide block 5, thereby driving the concave plate 6 to move synchronously. The concave plate 6 is designed to wrap around the end of the suspension frame body 3. The connecting holes 601 at both ends correspond to the assembly holes 301 of the suspension frame body 3, achieving initial positioning of the two. At the same time, the hinged cooperation with the slide block 5 provides space for angle adjustment.

[0019] The T-shaped rod 602 is fixedly connected to the concave plate 6 at one end and assembled to the worm gear 801 at the other end, which plays a role in power transmission. It converts the rotational motion of the worm gear 801 into the angle adjustment action of the concave plate 6. The meshing of the worm gear 801 and the worm 802 forms a speed reduction transmission structure, which can not only achieve precise power transmission, but also ensure the stability of the concave plate 6 after angle adjustment through the self-locking characteristic of the worm 802.

[0020] During operation, the servo motor 503 drives the adjusting screw 504 to rotate, which in turn moves the slide 5 along the connecting frame 4 through the threaded engagement, thereby adjusting the position of the concave plate 6. When the worm gear 802 is rotated, it meshes with the worm wheel 801 for transmission, and through the T-shaped rod 602, it drives the concave plate 6 to make a slight adjustment of the angle around the hinge point of the slide 5, so that the connecting hole 601 of the concave plate 6 is precisely aligned with the mounting hole 301 of the suspension frame body 3, laying the foundation for subsequent fixed connection. The overall structure achieves rapid assembly of the suspension frame through the coordination of power transmission and motion conversion.

[0021] Both T-shaped rods 602 extend through to the outside of the concave plate 6. The connection between the T-shaped rods 602 and the concave plate 6 is a rotatable connection. A transmission box 3 8 is fixedly installed on the side of the concave plate 6. The worm gear 801 and the worm 802 are located inside the transmission box 3 8. Both ends of the worm 802 are rotatably installed on the inner end of the transmission box 3 8. The end of the worm 802 extends through to the outside of the transmission box 3 8 and is provided with a hexagonal bolt hole 803. Specifically: In actual use, one end of the T-shaped rod 602 is fixedly connected to the concave plate 6, and the other end extends through the concave plate 6 to the outside. This ensures that the T-shaped rod 602 can stably transmit rotational power and provides a flexible rotational basis for the angle adjustment of the concave plate 6, avoiding jamming of the concave plate 6 when the T-shaped rod 602 rotates, and ensuring smooth angle adjustment.

[0022] The transmission box 3.8 serves as a protective structure for the installation of the worm gear 801 and worm 802. On the one hand, it provides a stable assembly space for the worm gear 801 and worm 802, ensuring that the two always maintain a precise meshing state and avoiding interference from external impurities that could affect the transmission accuracy. On the other hand, it provides physical protection for the worm gear 801 and worm 802, reducing the wear of the transmission components by dust and dirt in the working environment and extending the service life of the components.

[0023] The worm gear 801 and worm 802 are configured to form the core transmission component. The worm 802 transmits rotational power to the T-shaped rod 602 through meshing with the worm gear 801. Utilizing the deceleration characteristics of the worm gear 801 and worm 802 transmission, the angle adjustment of the concave plate 6 is made smoother and more controllable. At the same time, relying on the self-locking characteristics of the worm 802, the position of the concave plate 6 can be fixed after the angle adjustment is completed, preventing the angle from shifting due to vibration during operation and ensuring connection stability.

[0024] During operation, the operator inserts a hex wrench into the hex bolt hole 803 to rotate the worm gear 802. The worm gear 802 rotates stably within the transmission box 3 8 and meshes with the worm wheel 801, driving the T-shaped rod 602 to rotate around the through-hole. This causes the concave plate 6 to finely adjust its angle around the hinge point of the slide block 5, achieving precise alignment between the connecting hole 601 and the assembly hole 301, thus ensuring subsequent fixed connection. The overall structure, through the cooperation of transmission and protection, ensures the accuracy of angle adjustment and ease of operation.

[0025] Both ends of the inner side of the connecting frame 4 are fixedly installed with protrusions 401. Both ends of the slide 5 are provided with grooves 501 that are adapted to the protrusions 401. The slide 5 is slidably installed inside the connecting frame 4 through the grooves 501. The assembly hole 301 and the connection hole 601 are provided with pins 7. The ends of the two suspension frame bodies 3 are located inside the concave plate 6. The pins 7 pass through one side of the concave plate 6 and extend to the other end of the concave plate 6 after passing through the assembly hole 301 at the end of the suspension frame body 3. A fixing screw 701 is installed inside the pin 7. Specifically: In actual use, the protrusions 401 at both ends of the inner side of the connecting frame 4 and the grooves 501 at both ends of the slide block 5 are matched to form a sliding guide. The grooves 501 and the protrusions 401 cooperate to restrict the movement trajectory of the slide block 5, ensuring that the slide block 5 can only slide smoothly along the length direction of the connecting frame 4, avoiding lateral deviation or shaking of the slide block 5 during movement, providing a stable movement basis for the slide block 5 to drive the concave plate 6 to adjust its position, and ensuring the accuracy of subsequent hole alignment.

[0026] The pin 7 serves as the core connecting component between the concave plate 6 and the suspension frame body 3. It passes through one side of the concave plate 6, the mounting hole 301 of the suspension frame body 3, and extends to the other end of the concave plate 6, directly achieving initial fixation between the two. Its through-type design ensures that the connecting surfaces of the concave plate 6 and the suspension frame body 3 fit tightly together, preventing gaps from appearing due to vibration during operation. The threaded connection between the fixing screw 701 and one end of the pin 7 can axially limit the pin 7, preventing it from falling off during operation vibration, further enhancing the connection stability between the concave plate 6 and the suspension frame body 3, and ensuring that the overall connection structure remains reliable during rotary tiller operation.

[0027] The slide 5 moves within the connecting frame 4 guided by the protrusion 401 and the groove 501, causing the concave plate 6 to be adjusted to a position that matches the suspension frame body 3. After the end of the suspension frame body 3 is embedded into the inner side of the concave plate 6 to complete the initial positioning, the pin 7 passes through the hole in the concave plate 6 and the suspension frame body 3, and then the pin 7 is locked by the fixing screw 701, quickly completing the fixed connection between the two. The entire process achieves efficient assembly of the suspension frame through the cooperation of guidance, positioning and locking.

[0028] A cutter shaft assembly 102 is rotatably mounted on the inner side of the rotary tiller cutter holder 1. A rear drag plate 101 is hinged to one side of the rotary tiller cutter holder 1. A transmission box 1 2 is mounted in the middle of the rotary tiller cutter holder 1. A main beam rod 201 is mounted on both ends of the transmission box 1. A transmission box 202 is mounted on the side of the rotary tiller cutter holder 1. The transmission box 202 is connected to the transmission box 1 2 through the main beam rod 201. The cutter shaft assembly 102 is connected to the transmission box 202.

[0029] It should be noted that the cutter shaft assembly 102 includes a cutter shaft body, rotary tillers, and bearing components. The two ends of the cutter shaft body are rotatably connected to the rotary tiller blade holder 1 via bearings. The rotary tillers are evenly distributed circumferentially along the cutter shaft body and rotate at high speed under the drive of the cutter shaft body, achieving cutting, crushing, and tilling operations on the soil. During the operation of the rotary tiller, the rear drag plate 101 adheres to the tilled soil surface and moves synchronously with the rotary tiller's forward movement, leveling the crushed soil and reducing surface undulations. This lays a level soil foundation for subsequent agricultural operations such as sowing and transplanting. The transmission box 2 changes its internal gear transmission structure... The power transmission direction and speed are adjusted, and the adjusted power is transmitted to the transmission box 202 through the main beam 201 connected at both ends. The transmission box 202 is installed on the side of the rotary tiller blade holder 1. It receives the power transmitted by the transmission box 2 through the main beam 201, and then further adjusts the power parameters through the internal gear set. Finally, the power is transmitted to the cutter shaft assembly 102, driving the cutter shaft assembly 102 to rotate. This realizes the complete transmission of power from the external equipment to the actuator, ensuring that the cutter shaft assembly 102 obtains a continuous and stable driving force to meet the tillage needs. The above technology is a mature existing technology, so it will not be described in detail.

[0030] The working principle of this utility model is as follows: In specific use, firstly, the connecting frame 4 is fixed to the mounting part of the power equipment such as the tractor. Then, the ends of the two suspension frame bodies 3 in the middle of the rotary tiller blade holder 1 are placed on the inner side of the concave plate 6. At this time, the servo motor 503 at the outer end of the connecting frame 4 is started. The output end of the servo motor 503 drives the adjusting screw 504 on the inner side to rotate through the coupling. Since the screw hole 502 in the middle of the slide 5 is threadedly connected to the surface of the adjusting screw 504, and the two ends of the slide 5 slide in a sliding fit with the protrusion 401 on the inner side of the connecting frame 4 through the groove 501, the rotation of the adjusting screw 504 will drive the slide 5 to move smoothly along the length direction of the connecting frame 4 until the connecting holes 601 at both ends of the concave plate 6 and the mounting holes 301 at the ends of the suspension frame bodies 3 are in approximately the corresponding area. Then, the servo motor 503 is turned off to stop the movement of the slide 5.

[0031] Next, insert a hex wrench into the hex bolt hole 803 on the outside of the transmission box 38 and rotate it, which will drive the worm gear 802 inside the transmission box 38 to rotate. Since the worm gear 802 is engaged with the worm wheel 801 at the end of the T-shaped rod 602, the rotation of the worm gear 802 will drive the T-shaped rod 602 to rotate in conjunction with it. Since the T-shaped rod 602 is fixedly connected to the concave plate 6 and the concave plate 6 is hinged to the slide block 5, the rotation of the T-shaped rod 602 will drive the concave plate 6 to make a slight adjustment of the angle around the hinge point until the connecting hole 601 on the concave plate 6 is completely aligned with the mounting hole 301 on the suspension frame body 3.

[0032] Finally, insert pin 7 from one side of concave plate 6, so that pin 7 passes through the connecting hole 601 of concave plate 6, the mounting hole 301 of suspension frame body 3, and extends to the other end of concave plate 6. Then, thread fixing screw 701 into the inside of the protruding end of pin 7 to complete the axial limiting and fixing of pin 7. At this time, the connection between rotary tiller blade holder 1 and connecting frame 4 is completed. In the subsequent operation of rotary tiller, transmission box 1 2 transmits power to transmission box 2 202 through main beam rod 201. Transmission box 2 202 then drives the blade shaft assembly 102 inside the rotary tiller blade holder 1 to rotate to achieve soil tillage. At the same time, the rear drag plate 101 on one side of the blade holder can perform preliminary leveling of the tilled soil.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A quick-connect device for a rotary tiller suspension frame, comprising a rotary tiller blade holder (1) and a connecting frame (4), characterized in that: Two suspension frame bodies (3) are fixedly installed in the middle of the rotary tiller blade holder (1). Two assembly holes (301) are opened through one end of each suspension frame body (3). A slide seat (5) is slidably provided on the inner side of the connecting frame (4). A concave plate (6) is hinged in the middle of the slide seat (5). Two connecting holes (601) are opened through both ends of the concave plate (6). The diameter of the connecting holes (601) is equal to that of the assembly holes (301). The slide (5) has a through-hole (502) in the middle. An adjusting screw (504) is rotatably installed in the middle of the inner side of the connecting frame (4). A servo motor (503) is installed at the outer end of the connecting frame (4). The output end of the servo motor (503) is connected to the end of the adjusting screw (504) through a coupling. The slide (5) is threaded to the surface of the adjusting screw (504) through the screw hole (502). T-shaped rods (602) are fixedly installed at both ends of the concave plate (6). A worm gear (801) is fixedly installed at the end of one of the T-shaped rods (602). A worm (802) is meshed with the side of the worm gear (801).

2. The quick-connect device for the rotary tiller suspension frame according to claim 1, characterized in that: Both T-shaped rods (602) extend through to the outside of the concave plate (6), and the through connection between the T-shaped rods (602) and the concave plate (6) is a rotatable connection.

3. The quick-connect device for the rotary tiller suspension frame according to claim 1, characterized in that: The side of the concave plate (6) is fixedly installed with a transmission box three (8). The worm gear (801) and the worm (802) are located inside the transmission box three (8). Both ends of the worm (802) are rotatably installed on the inner end of the transmission box three (8). The end of the worm (802) extends through to the outer side of the transmission box three (8) and is provided with a hexagonal bolt hole (803).

4. The quick-connect device for the rotary tiller suspension frame according to claim 1, characterized in that: Both ends of the inner side of the connecting frame (4) are fixedly installed with protrusions (401), and both ends of the slide (5) are provided with grooves (501) that are adapted to the protrusions (401). The slide (5) is slidably installed inside the connecting frame (4) through the grooves (501).

5. The quick-connect device for the rotary tiller suspension frame according to claim 1, characterized in that: The assembly hole (301) and the connection hole (601) are provided with pins (7), and the ends of the two suspension bracket bodies (3) are located on the inner side of the concave plate (6).

6. The quick-connect device for the rotary tiller suspension frame according to claim 5, characterized in that: The pin (7) passes through one side of the concave plate (6) and extends to the other end of the concave plate (6) after passing through the mounting hole (301) at the end of the suspension frame body (3). A fixing screw (701) is installed inside the pin (7).

7. The quick-connect device for the rotary tiller suspension frame according to claim 1, characterized in that: The inner side of the rotary tiller blade holder (1) is rotatably mounted with a blade shaft assembly (102), and a rear drag plate (101) is hinged to one side of the rotary tiller blade holder (1).

8. The quick-connect device for the rotary tiller suspension frame according to claim 7, characterized in that: A transmission box 1 (2) is installed in the middle of the rotary tiller blade holder (1). A main beam rod (201) is installed at both ends of the transmission box 1 (2). A transmission box 2 (202) is installed on the side of the rotary tiller blade holder (1). The transmission box 2 (202) is connected to the transmission box 1 (2) through the main beam rod (201). The blade shaft assembly (102) is connected to the transmission box 2 (202).

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