A continuous soil conditioner mixing blender

Abstract

This utility model discloses a continuous soil conditioner mixing machine, including a rotatable mixing drum and a dispersion component disposed therein. The mixing drum comprises a straight section and two conical sections at both ends, and is equipped with spiral conveying blades and lifting plates to achieve continuous feeding, conveying, and discharging. The installation sleeve of the dispersion component is equipped with a drive shaft and a reversing mechanism, which drives the dispersion paddles on multiple rotating seats. Adjacent sets of dispersion paddles are arranged in opposite directions and driven by the reversing mechanism to achieve uniform reverse rotation. At the same time, the root of the dispersion paddle's material-facing surface has a convex structure, and the end has a concave structure. This solution combines the rotation of the mixing drum with the reverse shearing of the internal dispersion paddles, and utilizes the special "concave material gathering, convex material dispersing" design of the paddle blades to jointly form a highly efficient three-dimensional mixing flow field, effectively solving the problems of uneven mixing, easy agglomeration, and poor continuity of existing equipment, and achieving efficient, uniform, and continuous mixing of soil and conditioner.

Description

Technical Field

[0001] This utility model relates to the field of soil remediation and treatment technology, specifically a continuous soil conditioner mixing and stirring machine. Background Technology

[0002] Soil conditioners play a vital role in modern agricultural production, effectively improving soil structure, regulating pH, and enhancing nutrient utilization, thereby promoting crop growth. However, the uniformity of the mixing between soil conditioners and soil directly affects their application effectiveness. Traditional soil mixing equipment often employs intermittent stirring methods, resulting in low mixing efficiency, high energy consumption, and poor continuity, making it difficult to meet the continuous operation requirements of large-scale farmland soil improvement.

[0003] Currently, most continuous mixing equipment on the market is based on the principle of screw conveying, using helical blades to propel materials forward and achieve mixing during the conveying process. However, these devices still have shortcomings in terms of mixing uniformity. On the one hand, during screw conveying, materials mainly move axially, resulting in weak radial mixing capacity and a tendency for soil and conditioner to separate; on the other hand, for highly viscous soil materials, traditional mixing devices are prone to agglomeration, making it difficult to achieve fine dispersion. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a continuous soil conditioner mixing machine, which brings significant technological progress and beneficial effects in terms of improving work efficiency, ensuring mixing quality, enhancing equipment stability and expanding application scope.

[0005] The technical solution adopted by this utility model to achieve the above objectives is: a continuous soil conditioner mixing machine, comprising:

[0006] A mixing drum, comprising a straight cylindrical section and a conical cylindrical section fixed to both ends of the straight cylindrical section, wherein a spiral conveying blade and a lifting plate are provided in the mixing drum;

[0007] A dispersion assembly includes a mounting sleeve, a drive shaft, rotating seats, and a reversing mechanism that is poweredly connected to the drive shaft. The mounting sleeve is arranged along the axis of the stirring tank and has multiple mounting seats. The drive shaft is rotatably mounted to the axis of the mounting sleeve. Multiple sets of continuously arranged rotating seats are rotatably mounted on the mounting sleeve. Each set of rotating seats is equipped with multiple dispersion paddles arranged in a circular array. The dispersion paddles on adjacent sets of rotating seats are arranged in opposite directions, and adjacent sets of rotating seats rotate in opposite directions at the same speed. The root of the material-facing surface of the dispersion paddle is a convex structure with a high center and low sides, and the end of the material-facing surface of the dispersion paddle is a concave structure with a low center and high sides. The reversing mechanism is assembled into the mounting seats and is poweredly connected to the adjacent sets of rotating seats.

[0008] Based on the above technical solutions, in order to ensure that the installation sleeve and drive shaft can be stably assembled and operated in the mixing drum, and to ensure that the mixing drum can continuously feed materials, the following technical solutions are provided.

[0009] The outer ends of the two sets of conical sections are respectively rotatably equipped with a feeding interface and a discharging interface. The two ends of the mounting sleeve are respectively fixedly installed at the feeding interface and the discharging interface, and the end of the drive shaft extends to the outside of the feeding interface.

[0010] Based on the above technical solutions, in order to ensure that the mixing drum can operate stably around its own axis and to ensure that the mixing drum and the rotating seat and dispersing paddle inside it can work together, the following technical solutions are provided.

[0011] The outer wall of the stirring drum is fixed with an annular guide rail, and the bottom of the stirring drum is provided with a driving wheel and a driven wheel that are matched with the annular guide rail. The annular guide rail is supported on the driving wheel and the driven wheel.

[0012] It also includes a drive motor, the output shaft of which is connected to the drive shaft, a pulley A is fixedly connected to the end of the drive shaft, and a pulley B is fixedly connected to the drive pulley on the same axis. The pulley A and pulley B are connected by a belt.

[0013] Based on the above technical solutions, in order to ensure that the reversing mechanism can be stably assembled in the mounting base and that the drive shaft can stably transmit power to the reversing mechanism and split two power sources with opposite operating directions, the following technical solutions are provided.

[0014] The mounting base has an inner mounting cavity and an outer mounting cavity arranged around the inner mounting cavity. A drive bevel gear arranged in the inner mounting cavity is fixedly connected to the drive shaft.

[0015] The reversing mechanism includes multiple sets of internal drive bevel gears, external drive bevel gears, reversing bevel gear A, and reversing bevel gear B. The internal drive bevel gears are rotatably mounted in the internal mounting cavity and are meshed with the driving bevel gears. Each set of internal drive bevel gears is coaxially fixed to an external drive bevel gear arranged in the external mounting cavity. Each set of external drive bevel gears is meshed with reversing bevel gears A and B, which are arranged symmetrically. Two adjacent rotating seats are poweredly connected to reversing bevel gears A and B, respectively.

[0016] Based on the above technical solutions, in order to ensure that the reversing bevel gear A and the reversing bevel gear B can drive the rotating seat connected to them to maintain reverse and constant speed operation, the following technical solutions are provided.

[0017] A receiving groove is provided at the end axis of the rotating seat. A connecting ring seat is fixedly connected to the receiving groove and rotatably installed on the periphery of the mounting seat. An internal gear ring is fixedly connected to the inner wall of the connecting ring seat. Planetary gears arranged on the outside of the mounting seat are fixedly connected to the axis of each set of reversing bevel gears A and B. The planetary gears are meshed with the internal gear rings provided on the corresponding side.

[0018] The beneficial effects of this utility model are:

[0019] 1. Through the combined action of the rotating mixing drum, the continuous pushing of the internal spiral conveyor blades, and the lifting plates, the entire process of soil and conditioner mixing, from feeding and mixing to discharging, is achieved, greatly improving processing efficiency and meeting the operational needs of large-scale farmland improvement. The dispersion component structure, especially the reverse arrangement and constant-speed reverse rotation design of adjacent sets of dispersion paddles, creates a strong and complex convection and shear flow field within the mixing drum, significantly enhancing the radial and axial mixing of the materials and effectively avoiding mixing dead zones and stratification, thus achieving a high degree of uniform mixing of soil and conditioner.

[0020] 2. In this design, the material-facing surface of the dispersing paddle is specially designed, with a convex structure at the root (higher in the middle and lower on both sides) and a concave structure at the end (lower in the middle and higher on both sides). This design enables the dispersing paddle to generate a unique "aggregation" and "dispersion" effect during operation, which not only improves mixing efficiency but also effectively breaks up and disperses soil clumps (especially those easily formed in clay soils), effectively solving the industry problem of material agglomeration and insufficient dispersion in traditional equipment.

[0021] 3. The two ends of the mounting sleeve are directly fixed to the stationary loading and unloading interfaces, while the mixing drum rotates around them. This design decouples the support of the core transmission components (drive shaft, reversing mechanism) from the support of the mixing drum, making the support of the dispersing component more stable and unaffected by the rotation of the mixing drum, thus ensuring the long-term stability and reliability of the complex transmission system. Simultaneously, by using a single drive motor to simultaneously drive the rotation of the mixing drum and the operation of the dispersing component, efficient power concentration and utilization are achieved, simplifying the overall structure and reducing manufacturing costs and energy consumption.

[0022] 4. This equipment integrates multiple mixing mechanisms: axial conveying and mixing via spiral conveyor blades, wide-area lifting and spreading mixing via lifting plates, and fine shearing and convection mixing via reverse dispersion paddles. These mixing methods work synergistically in time and space to create a three-dimensional, high-intensity mixing environment. This makes the equipment suitable not only for general sandy loam and soil conditioners, but also for soils with high viscosity and a tendency to clump, or for mixing with conditioners of different physical properties such as fibrous and powdery materials. It exhibits excellent adaptability and mixing effects, making it widely applicable. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 A schematic diagram of the assembly of various components inside the mixing tank;

[0025] Figure 3 A schematic diagram of the structure for connecting the drive motor and the distributed components;

[0026] Figure 4 A schematic diagram of the assembly of the mounting sleeve, drive shaft, and rotating seat;

[0027] Figure 5 A schematic diagram of the structure for the matching combination of the drive shaft, the reversing mechanism and the connecting ring seats in the two adjacent sets of rotating seats;

[0028] Figure 6 A schematic diagram of the structure of the drive shaft and the reversing mechanism.

[0029] In the diagram: 1. Mixing drum, 11. Straight cylinder section, 12. Conical cylinder section, 131. Spiral conveyor blade, 132. Lifting plate, 141. Feeding interface, 142. Discharging interface, 151. Annular guide rail, 152. Driving wheel, 153. Driven wheel, 154. Belt pulley B, 155. Connecting shaft, 16. Mounting support, 2. Dispersion assembly, 21. Mounting sleeve, 211. Mounting seat, 212. Inner mounting cavity, 213. Outer mounting cavity, 22. Drive shaft, 221. Belt pulley A, 222. Drive bevel gear, 23. Rotating seat, 231. Dispersion paddle, 232. Convex structure, 233. Concave structure, 234. Receiving groove, 235. Connecting ring seat, 236. Internal gear ring, 24. Reversing mechanism, 241. Inner transmission bevel gear, 242. Outer transmission bevel gear, 243. Reversing bevel gear A, 244. Reversing bevel gear B, 245. Planetary gear, 3. Drive motor. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0031] Please see Figure 1-6 A continuous soil conditioner mixing machine, comprising:

[0032] The mixing drum 1 includes a straight section 11 and a conical section 12 fixed to both ends of the straight section 11. The mixing drum 1 is provided with a spiral conveying blade 131 and a lifting plate 132.

[0033] The dispersion assembly 2 includes a mounting sleeve 21, a drive shaft 22, a rotating seat 23, and a reversing mechanism 24 that is poweredly connected to the drive shaft 22. The mounting sleeve 21 is arranged along the axis of the mixing tank 1 and is provided with multiple mounting seats 211. The drive shaft 22 is rotatably mounted to the axis of the mounting sleeve 21. Multiple sets of continuously arranged rotating seats 23 are rotatably mounted on the mounting sleeve 21. Each set of rotating seats 23 is equipped with multiple dispersion paddles 231 arranged in a ring array. The dispersion paddles 231 on adjacent sets of rotating seats 23 are arranged in opposite directions and rotate in opposite directions at the same speed. The root of the material-facing surface of the dispersion paddle 231 is set with a convex structure 232 that is high in the middle and low on both sides, and the end of the material-facing surface of the dispersion paddle 231 is set with a concave structure 233 that is low in the middle and high on both sides. The reversing mechanism 24 is assembled into the mounting seat 211 and is poweredly connected to the adjacent sets of rotating seats 23.

[0034] The mixing drum 1 rotates around its own axis. The spiral conveyor blades 131 within it are arranged along the inner contours of the straight section 11 and the conical section 12. The two sets of conical sections 12 are used for the continuous feeding and unloading of soil and conditioner, respectively. Under the continuous pushing action of the spiral conveyor blades 131, the soil is transported from the upstream end to the downstream section after mixing and stirring, and finally continuously output outwards. The lifting plates 132 are evenly arranged in a ring array on the inner wall of the straight section 11. When the mixing drum 1 drives its rotation, they can lift the soil at the bottom upwards, and after the lifting plates 132 flip to a certain angle, they fall back down from a height, cooperating with the dispersing component 2 to achieve efficient and thorough mixing of the soil and conditioner.

[0035] The rotating seat 23 and the dispersing paddle 231 in the dispersing assembly 2 are set in the straight section 11 of the mixing drum 1. For the dispersing assembly 2, the mounting sleeve can provide stable support for the drive shaft 22, the rotating seat 23 and the reversing mechanism 24 and ensure their stable operation. The mounting seat 211 on it is used to assemble the reversing mechanism 24. A set of rotating seats 23 is provided on each side of each set of mounting seats 211. After receiving the power from the drive shaft 22, the reversing mechanism 24 distributes it to the rotating seats 23 on both sides and makes the rotating seats 23 on both sides always maintain the same speed and reverse rotation.

[0036] Since the dispersing paddles 231 on the two adjacent sets of rotating seats 23 are arranged in opposite directions and move in opposite directions, when the end of the dispersing paddle 231 rotates past the bottom of the mixing drum 1, it can lift the material from the bottom. During the upward rotation, the material gradually flows from the end of the dispersing paddle 231 to the root. Because the end of the dispersing paddle 231 has a concave structure 233, it can effectively gather the material to the middle of the dispersing paddle 231 and prevent it from scattering from both sides, thus having a material gathering effect. When the material flows to the root, because the root of the dispersing paddle 231 has a convex structure 232, it can disperse the material flowing there from the middle to both sides, thus having a material dispersing effect.

[0037] During continuous operation, the material at the bottom of the mixing drum 1 is lifted upwards and scattered from both sides of the dispersing paddle 231. The dispersing paddles 231 on the two adjacent sets of rotating seats 23 are arranged in opposite directions and run, which can fully mix the material scattered from the two sets of dispersing paddles 231. When the lifting plate 132 in the mixing drum 1 lifts the material upwards and scatters it, it will fall onto the running dispersing paddle 231, thereby further mixing the soil and conditioner thoroughly.

[0038] Based on the above operating principle, the mixing mixer provided in this application can realize the continuous feeding and conveying of soil, and achieve thorough mixing of soil and conditioner in the process.

[0039] To ensure that the mounting sleeve 21 and drive shaft 22 can be stably assembled and operated in the mixing drum 1, and to ensure that the mixing drum 1 can continuously feed materials, the following technical solution is provided.

[0040] The outer ends of the two sets of conical sections 12 are respectively rotatably mounted with a feeding interface 141 and a discharging interface 142. The two ends of the mounting sleeve 21 are respectively fixedly mounted to the feeding interface 141 and the discharging interface. The end of the drive shaft 22 extends to the outside of the feeding interface 141.

[0041] Both the feeding port 141 and the discharging port 142 are set as L-shaped pipes and are fixedly installed on the frame or the frame of agricultural machinery equipment so that the mixing drum 1 can rotate stably around its own axis between the feeding port 141 and the discharging port 142.

[0042] The opening of the feeding interface 141 is set to face upwards, and the opening of the unloading interface 142 is set to face upwards, so as to facilitate the stable continuous feeding and unloading. The feeding interface 141 and the unloading interface 142 can also provide stable support for the installation of the mounting sleeve 21.

[0043] To ensure that the mixing drum 1 can operate stably around its own axis and to ensure that the mixing drum 1 and the rotating seat 23 and the dispersing paddle 231 provided inside it can cooperate in operation, the following technical solution is provided.

[0044] An annular guide rail 151 is fixed to the outer wall of the mixing drum 1. The bottom of the mixing drum 1 is provided with a driving wheel 152 and a driven wheel 153 that are matched with the annular guide rail 151. The annular guide rail 151 is supported on the driving wheel 152 and the driven wheel 153.

[0045] It also includes a drive motor 3, the output shaft of the drive motor 3 is connected to the drive shaft 22, the end of the drive shaft 22 is fixedly connected to a pulley A221, the drive wheel 152 is coaxially fixedly connected to a pulley B154, and the pulley A221 and the pulley B154 are connected to each other by a belt.

[0046] The mixing drum 1 is provided with at least two sets of annular guide rails 151. The number of driving wheels 152 and driven wheels 153 is adapted to the number of annular guide rails 151. At least each set of driving wheels 152 is coaxially fixed through a connecting shaft 155, and the pulley is fixed to the connecting shaft 155. The drive motor 3 is a geared motor, and its output shaft is directly coaxially fixed to the drive shaft 22 to drive the drive shaft 22 to rotate stably. Then, through the combination of the pulley and the pulley B154, the driving wheel 152 is driven to rotate stably. The driving wheel 152 and the driven wheel 153 cooperate to provide stable support for the mixing drum 1 while driving it to rotate stably around its own axis.

[0047] Multiple mounting supports 16 are provided at the bottom of the mixing drum 1 to ensure that the driving wheel 152, the driven wheel 153 and the pulley B154 are stably installed in a relative rotational posture, thereby driving the mixing drum 1 to operate stably.

[0048] To ensure that the reversing mechanism 24 can be stably assembled in the mounting base 211, and to ensure that the drive shaft 22 can stably transmit power to the reversing mechanism 24 and split two power sources with opposite operating directions, the following technical solution is provided.

[0049] The mounting base 211 has an inner mounting cavity 212 and an outer mounting cavity 213 arranged around the inner mounting cavity 212. A drive bevel gear 222 arranged in the inner mounting cavity 212 is fixedly connected to the drive shaft 22.

[0050] The reversing mechanism 24 includes multiple sets of internal drive bevel gears 241, external drive bevel gears 242, reversing bevel gears A243 and B244. The internal drive bevel gears 241 are rotatably mounted in the internal mounting cavity 212 and are meshed with the drive bevel gears 222. Each set of internal drive bevel gears 241 is coaxially fixed to the external drive bevel gears 242 arranged in the external mounting cavity 213. Each set of external drive bevel gears 242 is meshed with the reversing bevel gears A243 and B244, which are arranged symmetrically. Two sets of adjacent rotating seats 23 are poweredly connected to the reversing bevel gears A243 and B244, respectively.

[0051] The inner mounting cavity 212 and the outer mounting cavity 213 are provided to ensure that the drive bevel gear 222 and the reversing mechanism 24 can be stably assembled therein. Each set of inner transmission bevel gear 241, outer transmission bevel gear 242, reversing bevel gear A243 and reversing bevel gear B244 are arranged on the periphery of the drive bevel gear 222 and distributed in a ring array.

[0052] When the drive shaft 22 drives the drive bevel gear 222 to operate, it can drive each set of internal transmission bevel gears 241 and the external transmission bevel gear 242 that are coaxially fixed with it to always operate synchronously. In turn, the external transmission bevel gear 242 drives the reversing bevel gear A243 and reversing bevel gear B244 that are meshed with it to operate stably. Since the reversing bevel gear A243 and reversing bevel gear B244 maintain a symmetrical layout, when the power is transmitted from the external transmission bevel gear 242 to the reversing bevel gear A243 and reversing bevel gear B244, it can ensure that the two always maintain the same speed and reverse rotation posture, thereby driving the two sets of rotating seats 23 connected to the power to maintain the same speed and reverse rotation.

[0053] To ensure that the reversing bevel gears A243 and B244 can drive the rotating seat 23 connected to them to maintain reverse and constant speed operation, the following technical solution is provided.

[0054] A receiving groove 234 is provided at the end of the rotating seat 23. A connecting ring seat 235 is fixedly connected to the receiving groove 234 and rotatably installed to the periphery of the mounting seat 211. An internal gear ring 236 is fixedly connected to the inner wall of the connecting ring seat 235. Planetary gears 245 arranged on the outside of the mounting seat 211 are fixedly connected to the shaft of each set of reversing bevel gears A243 and B244. The planetary gears 245 are meshed with the internal gear rings 236 provided on the corresponding side.

[0055] The arrangement of the receiving groove 234 ensures that the connecting ring seat 235 can be detachably assembled into the rotating seat 23. The planetary gears 245 connected to the reversing bevel gear A243 and the reversing bevel gear B244 also maintain the same speed and reverse rotation, thereby driving the internal gear ring 236 on the corresponding side to run. This ensures that the two sets of internal gear rings 236 and their respective connected rotating seats 23 also maintain the same speed and reverse rotation.

[0056] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A continuous soil conditioner mixing machine, characterized in that, include: A mixing drum (1) includes a straight section (11) and a conical section (12) fixed to both ends of the straight section (11). The mixing drum (1) is provided with a spiral conveying blade (131) and a lifting plate (132). A dispersion assembly (2) includes a mounting sleeve (21), a drive shaft (22), a rotating seat (23), and a reversing mechanism (24) that maintains a power connection with the drive shaft (22). The mounting sleeve (21) is arranged along the axis of the stirring tank (1), and multiple mounting seats (211) are provided on the mounting sleeve (21). The drive shaft (22) is rotatably mounted to the axis of the mounting sleeve (21), and multiple sets of continuously arranged rotating seats (23) are rotatably mounted on the mounting sleeve (21). Each set of rotating seats (23) Each of the two sets of rotating seats (23) is equipped with multiple dispersing paddles (231) arranged in a ring array. The dispersing paddles (231) on the two adjacent sets of rotating seats (23) are arranged in opposite directions. The two adjacent sets of rotating seats (23) rotate in opposite directions at the same speed. The root of the dispersing paddle (231) is set as a convex structure (232) with a high middle and low sides. The end of the dispersing paddle (231) is set as a concave structure (233) with a low middle and high sides. The reversing mechanism (24) is assembled into the mounting base (211) and is poweredly connected to the two adjacent sets of rotating seats (23).

2. The continuous soil conditioner mixing machine according to claim 1, characterized in that: The outer ends of the two sets of cone sections (12) are respectively rotatably installed with a loading interface (141) and a unloading interface (142). The two ends of the mounting sleeve (21) are respectively fixedly installed at the loading interface (141) and the unloading interface. The end of the drive shaft (22) extends to the outside of the loading interface (141).

3. The continuous soil conditioner mixing machine according to claim 2, characterized in that: The outer wall of the stirring drum (1) is fixed with an annular guide rail (151). The bottom of the stirring drum (1) is provided with a driving wheel (152) and a driven wheel (153) that are matched with the annular guide rail (151). The annular guide rail (151) is supported on the driving wheel (152) and the driven wheel (153). It also includes a drive motor (3), the output shaft of the drive motor (3) is connected to the drive shaft (22) in a power connection, the end of the drive shaft (22) is fixedly connected to a pulley A (221), the drive wheel (152) is coaxially fixedly connected to a pulley B (154), and the pulley A (221) and pulley B (154) are connected in a power connection through a belt.

4. The continuous soil conditioner mixing machine according to claim 1, characterized in that: The mounting base (211) has an inner mounting cavity (212) and an outer mounting cavity (213) arranged around the inner mounting cavity (212). A drive bevel gear (222) arranged in the inner mounting cavity (212) is fixedly connected to the drive shaft (22). The reversing mechanism (24) includes multiple sets of internal drive bevel gears (241), external drive bevel gears (242), reversing bevel gear A (243), and reversing bevel gear B (244). The internal drive bevel gears (241) are rotatably installed in the internal mounting cavity (212) and are meshed with the driving bevel gears (222). Each set of internal drive bevel gears (241) is coaxially fixed with external drive bevel gears (242) arranged in the external mounting cavity (213). Each set of external drive bevel gears (242) is meshed with reversing bevel gears A (243) and reversing bevel gears B (244) arranged symmetrically. Two adjacent rotating seats (23) are poweredly connected to reversing bevel gears A (243) and reversing bevel gears B (244).

5. A continuous soil conditioner mixing machine according to claim 4, characterized in that: The rotating seat (23) has a receiving groove (234) at the end of its shaft. A connecting ring seat (235) is fixedly connected to the receiving groove (234) and rotatably mounted to the periphery of the mounting seat (211). An internal gear ring (236) is fixedly connected to the inner wall of the connecting ring seat (235). Planetary gears (245) arranged on the outside of the mounting seat (211) are fixedly connected to the shaft of each set of reversing bevel gears A (243) and reversing bevel gears B (244). The planetary gears (245) are meshed with the internal gear rings (236) on the corresponding side.

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