Bucket wheel machine in the form of a small-span short-axis structure

Abstract

A bucket wheel mechanism with a small-span short-shaft structure comprises an arm support, a short-shaft assembly floatingly fixed on the arm support, a driving device installed at the input end of the short-shaft assembly, and a wheel body assembly connected to the driving end of the short-shaft assembly. The technical key points are that the short-shaft assembly is floatingly installed on the arm support, the wheel body assembly is rotatably installed at the driving end of the short-shaft assembly, and the wheel body assembly and the driving device are arranged on the two sides of the floating bearing seat. The unilateral arrangement between the bucket wheel mechanism and the arm support is realized, the free cutting angles on the two sides of the arm support are balanced, and the disadvantage that the long-shaft bucket wheel mechanism has a large free cutting angle on one side and a small free cutting angle on the other side, which cannot complete the reciprocating excavation operation of the whole machine, is avoided. The small-span short-shaft structure makes the bucket wheel mechanism compact in size, the torsional stiffness of the rotating shaft better, the weight optimized, the stability of the whole machine improved, and the layout of the whole machine more reasonable.

Description

Technical Field

[0001] This invention relates to open-pit mining and bulk material handling equipment, and in particular to a bucket wheel mechanism with a small span and short shaft structure, which is mainly applicable to bucket wheel excavators for coal, rock or topsoil excavation. Background Technology

[0002] Currently, existing bucket wheel excavators generally employ a large-span shaft system arrangement for their bucket wheel mechanisms, such as the "High-Power Bucket Wheel Excavator Variable Speed ​​Planetary Reducer" disclosed in publication number CN203082133U. This technical solution includes an input gear shaft, a small bevel gear shaft and small bevel gear, a large bevel gear and large bevel gear shaft, an intermediate gear, an intermediate shaft, and a planetary reduction mechanism. It also adds a speed-shifting mechanism, which is installed between the input gear shaft and the small bevel gear shaft. During operation, the torque of the drive unit is transmitted to the first-stage gear mechanism on the input gear shaft, and the shifting gears mesh with the left and right double gears respectively. However, this technical solution often has the following drawbacks: The drive unit is positioned away from the wheel body, which limits the specifications of the bucket wheel and drive unit due to the limited load-bearing capacity of the boom; under the same specifications, the balance limitation of this arrangement results in a larger free cutting angle on one side of the bucket wheel and a smaller free cutting angle on the other. This forces the machine to operate only in a unidirectional excavation mode, reducing work efficiency. At the same time, the long shaft has poor structural torsional stiffness, which usually results in a larger diameter being selected under the same level of driving torque. This increases the weight of the bucket wheel mechanism, causing an increase in the offset of the machine's center of gravity and greatly affecting the stability of the machine. Summary of the Invention

[0003] The purpose of this invention is to provide a bucket wheel mechanism with a small span and short shaft structure, fundamentally solving the aforementioned problems. It achieves a unilateral arrangement between the bucket wheel mechanism and the boom, balancing the free cutting angles on both sides of the boom. This avoids the drawback of long-shaft bucket wheel mechanisms where one side has a large free cutting angle while the other side is too small, making it unable to complete the reciprocating digging operation of the entire machine. The small span and short shaft structure makes the bucket wheel mechanism compact, improves the torsional stiffness of the shaft, optimizes weight, enhances the overall stability of the machine, and makes the overall layout more rational.

[0004] To achieve the above objectives, the present invention provides the following technical solution: The bucket wheel mechanism with a small span and short shaft structure includes a boom, a short shaft assembly floatingly fixed on the boom, a drive device installed at the input end of the short shaft assembly, and a wheel assembly axled to the far drive end of the short shaft assembly. The key technical features are: the short shaft assembly is floatingly mounted on the boom, the wheel assembly is rotatably mounted at the far drive end of the short shaft assembly, and the wheel assembly and drive device are respectively located on both sides of the floating bearing seat; a reinforcing flange is provided on the short shaft. The short shaft has a fixed end shoulder at the far drive end, and a fixed bearing housing is installed at the far end of the fixed end shoulder. The fixed bearing housing is fixed to the end cap by bolts at the far drive end. The near drive end is fitted with a fixed end labyrinth positioning ring and a fixed end through cover that cooperate with each other. A fixed end variable diameter positioning ring limits the fixed end between the fixed end labyrinth positioning ring and the fixed end shoulder. Fixed end gaskets are provided for primary sealing between the fixed bearing housing and the end cover, and between the fixed bearing housing and the fixed end through cover. The fixed end bearing is assembled between the fixed bearing housing and the short shaft. The short shaft has a floating end shoulder at the near drive end, and a floating bearing housing is installed at the near end of the floating end shoulder. The far drive end and the near drive end of the floating bearing housing are each fitted with a pair of mating floating end labyrinth positioning rings and floating end covers. A floating end variable diameter positioning ring limits the floating end between the floating end cover of the far drive end and the floating end shoulder. Floating end gaskets are provided for primary sealing between the floating bearing housing and the floating end covers on both sides. The floating end bearing is assembled between the floating bearing housing and the short shaft. A locking disc is also installed between the floating bearing housing and the drive unit; A pair of rubber V-shaped sealing rings are used for secondary sealing between the floating end cover and the floating end labyrinth positioning ring, or between the fixed end cover and the fixed end labyrinth positioning ring.

[0005] Furthermore, the bucket wheel mechanism and the unloading arm slewing mechanism are used together in the bucket wheel excavator. The unloading arm slewing mechanism includes the main traveling mechanism, the support base assembly, the rotating platform assembly, and the adjusting plate assembly. The support base assembly includes a central tube vertically fixed to the main traveling mechanism and a mounting base fixed to the central tube; the rotating platform assembly includes a rotatable rotating platform supported on an L-shaped beam.

[0006] Furthermore, the adjustment plate assembly includes an adjustment plate body, lower connecting shaft slides symmetrically arranged on both sides of the adjustment plate body, and upper connecting shaft slides symmetrically arranged on the other two sides of the adjustment plate body, wherein the guiding directions of the lower connecting shaft slides and the upper connecting shaft slides are perpendicular to each other.

[0007] Furthermore, the mounting base is slidably fitted onto the upper connecting shaft slide groove via a pair of symmetrically arranged downward connecting shafts, with the bottom of the downward connecting shafts mounted inside the mounting base. The fixed large gear ring is slidably fitted onto the lower connecting shaft slide rail via a pair of symmetrically arranged upward connecting shafts, with the top of the upward connecting shafts mounted inside the fixed large gear ring.

[0008] Furthermore, the outer edge of the slewing platform is rotatably supported on the L-shaped beam by a slewing bearing assembly. The bottom flange of the slewing platform is fixed to a small slewing bearing, and the bottom of the small slewing bearing is mounted on a fixed large gear ring by a bolt assembly, so that the slewing platform and the fixed large gear ring can be rotatably engaged. A pair of slewing drive devices are symmetrically installed on the slewing platform. The output end of each slewing drive device passes through the slewing platform and is provided with a drive gear. The drive gears mesh symmetrically at both ends of the fixed large gear ring.

[0009] The beneficial effects of this invention are as follows: Through targeted improvements to the core mechanism of the bucket wheel excavator, this invention achieves advantages such as optimized stress distribution, improved efficiency, convenient maintenance, and adaptability to complex working conditions. In terms of overall technical solution, the machine has a reasonable structural layout and excellent stress characteristics, making it suitable for high-capacity applications and long-arm structures, overcoming the core technical problems associated with them.

[0010] Free cutting refers to a cutting method where the chip flow direction is roughly the same at all points on the cutting edge, and the length of the cutting edge that does not participate in the work is zero. In terms of the overall technical solution, the drive unit is positioned near the floating bearing seat of the wheel assembly, shortening the span between the two ball bearings. After reducing the lateral dimension of the bucket wheel mechanism, the entire bucket wheel mechanism is positioned on one side of the boom, ensuring that both sides of the wheel assembly have reasonable free cutting angles simultaneously, meeting the requirements of reciprocating digging operations and improving work efficiency. Furthermore, the short shaft structure has superior torsional stiffness, optimizes the weight of the bucket wheel mechanism, and improves the overall stability of the machine, thus allowing for further increases in the size of the wheel assembly within the boom load-bearing limits.

[0011] For the bucket wheel mechanism, the drive unit and conveyor are arranged on both sides of the bucket wheel body, so that the center point of the bucket lip on the bucket wheel body is close to or coincides with the center line of the entire machine, reducing the damage to the structure caused by off-center loading; at the same time, it shortens the extension distance on both sides of the bucket wheel body, realizing bidirectional material handling. The drive unit is close to the floating bearing seat, shortening the bearing span and reducing the lateral dimension; the drive unit and bucket wheel body are arranged as a whole on one side of the boom, ensuring free cutting angles on both sides, adapting to bidirectional excavation, and improving operating efficiency. The short shaft structure increases the torsional stiffness of the receiving boom, optimizes the weight of the bucket wheel mechanism, enhances the stability of the entire machine, and allows for an increase in wheel size within the boom load limit.

[0012] For the unloading boom slewing mechanism, the connection point between the pitch mechanism connecting rod and the unloading boom is moved towards the receiving end, making the connecting rod and the unloading boom arranged at an acute angle. This reduces the risk of bending deformation of the unloading boom and facilitates structural weight reduction. The slewing mechanism eliminates the central suspension shaft system and adopts a direct connection of "small slewing bearing + fixed large gear ring," improving the resistance to eccentric loads and avoiding the stress concentration problem of traditional shaft systems. The assembly process is simplified, reducing accumulated errors, minimizing operational failures, and facilitating maintenance. The flexible sliding structure (adjusting plate, large gear ring, fixed central tube) can absorb the impact vibration of the traveling mechanism, preventing vibration from being transmitted to the bucket wheel and boom, ensuring smooth operation and extending the life of core components. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of the bucket wheel drive mechanism of the present invention.

[0014] Figure 1a for Figure 1 A partially enlarged structural diagram.

[0015] Figure 2 This is a schematic diagram of the unloading arm rotation mechanism of the present invention.

[0016] Figure 2a for Figure 2 A partially enlarged structural diagram.

[0017] Figure 2b for Figure 2 A cross-sectional view of the structure along line CC.

[0018] Figure 2c for Figure 2 A schematic diagram of the cross-sectional structure along line DD.

[0019] Figure 3 This is a reference diagram showing the usage state of the present invention. Detailed Implementation

[0020] The following combination Figures 1-3 The specific content of the present invention will be described in detail through specific embodiments. Figure 3As shown, the bucket wheel drive mechanism 2 and the unloading arm slewing mechanism 3 are both applied to the bucket wheel excavator. The excavator mainly includes a support mechanism 1, a bucket wheel drive mechanism 2, an unloading arm slewing mechanism 3, a track walking mechanism 4, and a tensioning mechanism 5. The support mechanism 1 includes a central support gantry 11, a receiving arm 14, a gantry-shaped rotary table 17, and an unloading arm 16. The tail of the receiving arm 14 is hinged to the central support gantry 11, and the bottom of the receiving arm 14 is hinged to the bottom of the central support gantry 11 through two hydraulic cylinders 12. One end of the unloading arm 16 is rotatably mounted on the gantry-shaped rotary table 17, and the middle of the unloading arm 16 is connected to the central support gantry 11 through an unloading arm pitching mechanism 13. The upper end of the unloading boom pitching mechanism 13 is hinged to the upper part of the central support gantry 11 through the pitching mechanism hinge point 15. The short beam of the unloading boom pitching mechanism 13 and the hinge point 161 of the unloading boom 16 move from the vertical point to the receiving end, arranged at an acute angle. It is connected to the upper cover plate at the center rotation position of the central support gantry 11 at the lower part of the receiving point. The slewing bearing assembly 37 is connected to the chassis 432 through its own central tube 312. The tracked walking mechanism 4 is connected to the gantry turntable 17 through the slewing bearing assembly 37. The lower part of the chassis 432 of the tracked walking mechanism 4 has a zigzag design to ensure external maintenance space at the lubrication points of the multi-stage balance beams.

[0021] like Figure 1 , Figure 1a As shown, the bucket wheel drive mechanism 2 includes a receiving boom 27, a short shaft assembly 22 floatingly fixed on the receiving boom 27, a drive device 26 installed at the drive end of the short shaft assembly 22, and a wheel assembly 21 fixed on the short shaft assembly 22. The short shaft assembly 22 includes a short shaft 221, a fixed bearing seat 24 rotatably fitted at the far end of the short shaft 221 to the drive device 26 for mounting the wheel assembly 21, and a floating bearing seat 25 rotatably fitted at the near end of the short shaft 221 to the drive device 26 for floatingly assembling the short shaft assembly 22 onto the receiving boom 27. A receiving belt conveyor 141 is arranged inside the receiving boom 27. The receiving belt conveyor 141 is arranged at a certain angle to the central axis of symmetry in the width direction of the entire machine, intersecting the axis of symmetry at the support center point of the rotary platform 38. The lower conveyor 142 is located below the receiving boom 27, receiving the material transferred by the receiving belt conveyor 141 and conveying it backward; the head roller 143 is installed at the front end of the receiving boom 27, providing transmission power and tension adjustment for the receiving belt conveyor 141 to ensure stable conveying.

[0022] The short shaft 221 is bolted to the web of the wheel assembly 21 using a reinforcing flange 223 in the middle. A stop structure is used for radial positioning. The far drive end of the short shaft 221 has a large transition fillet and a fixed end shoulder 224. A fixed bearing seat 24 is installed at the far end of the fixed end shoulder 224. The fixed bearing seat 24 and the floating bearing seat 25 are bolted to the receiving boom 27, so that the entire bucket wheel mechanism is arranged on one side of the receiving boom 27.

[0023] A fixed-end bearing 241, preferably a ball bearing, is assembled between the fixed bearing housing 24 and the short shaft 221. The near-drive device 26 end of the fixed bearing housing 24 is axially positioned using a fixed-end variable-diameter positioning ring 244, a fixed-end labyrinth-type positioning ring 245, and a fixed-end through-cap 243. The far-drive device 26 end of the fixed bearing housing 24 is axially positioned using an end plate 222 and an end cap 23. Fixed-end washers 242 are respectively provided between the fixed bearing housing 24 and the end cap 23 or between the fixed-end through-cap 243 for cavity sealing. The fixed-end through-cap 243 adopts an integrated positioning and labyrinth structure, forming a labyrinth seal when combined with the fixed-end labyrinth-type positioning ring 245. The fixed-end through-cap 243 is fitted onto the fixed-end labyrinth-type positioning ring 245, with a pair of rubber V-rings providing secondary sealing.

[0024] Similarly, the near-drive end of the short shaft 221 has a transition fillet and a floating end shoulder 225. A floating bearing seat 25 is installed near the floating end shoulder 225. A floating end bearing 251, preferably a ball bearing, is assembled between the floating bearing seat 25 and the short shaft 221. The floating bearing seat 25 is axially positioned by a pair of symmetrically arranged floating end covers 253 and floating end labyrinth-type positioning rings 255. The floating end labyrinth-type positioning ring 255 assembled at the far-drive end 26 along the axial direction is positioned by a floating end variable diameter positioning ring 254, and the floating end labyrinth-type positioning ring 255 assembled at the near-drive end 26 is positioned by a locking disc 256. Floating end washers 252 are respectively provided between the floating bearing seat 25 and the floating end covers 253 at both ends for cavity sealing. The floating end cover 253 adopts an integrated positioning and labyrinth structure, which, together with the floating end labyrinth-type positioning ring 255, forms a labyrinth seal. The floating end cover 253 is fitted onto the floating end labyrinth positioning ring 255, and the labyrinth seal is secondary sealed by the inner rubber V-shaped sealing ring 2552 and the outer rubber V-shaped sealing ring 2551.

[0025] Through the above scheme, the short shaft assembly 22 can float relative to the width direction of the receiving boom 27. The floating range of the wheel assembly 21 is determined by the floating stroke of the floating bearing seat 25 on the short shaft 221. The drive device 26 and the wheel assembly 21 are respectively located at opposite ends of the floating bearing seat 25. In the non-working state, the weight of the drive device 26 end is greater than that of the wheel assembly 21. When the wheel assembly 21 rotates in the working state, the drive device 26 acts as a power source, driving the wheel assembly 21, which is coaxial with it, to rotate. According to the centrifugal force formula F=mω²r (where F is the centrifugal force, m is the mass, ω is the angular velocity, and r is the radius of rotation), when the wheel rotates, it generates a larger centrifugal force due to its larger radius of rotation relative to the motor. In the high-speed rotation state, the direction of the centrifugal force is away from the center of rotation. Since the wheel and the motor are located at opposite ends of the floating bearing seat 25, they can balance each other at a specific speed, keeping the entire shaft system stable during rotation. This avoids the imbalance problem caused by the superposition of the wheel assembly 21 and the drive device 26, thus ensuring that both sides of the wheel assembly 21 have reasonable free cutting angles, meeting the requirements of reciprocating digging operations and improving work efficiency.

[0026] like Figure 2 , Figure 2a , Figure 2b , Figure 2c As shown, the unloading arm slewing mechanism 3 is fixed on the tracked traveling mechanism 4, and includes a support base assembly 31, a rotating platform assembly, and an adjusting plate assembly 39. The support base assembly 31 includes a central tube 312 vertically fixed on the main traveling mechanism and a mounting seat 311 fixed on the central tube 312. To facilitate manufacturing and on-site assembly and maintenance, the central tube 312 adopts a three-section structure and is fixedly connected by bolts.

[0027] The adjusting plate assembly 39 includes an adjusting plate body 392, lower connecting shaft slides 391 symmetrically arranged on both sides of the adjusting plate body 392, and upper connecting shaft slide grooves 393 symmetrically arranged on the other two sides of the adjusting plate body 392. The guiding directions of the lower connecting shaft slides 391 and the upper connecting shaft slide grooves 393 are perpendicular to each other. The mounting base 311 is slidably engaged with the upper connecting shaft slide grooves 393 via a pair of symmetrically arranged lower connecting shafts 394. The bottom of the lower connecting shafts 394 is fitted into the mounting base 311. The fixed large gear ring 33 is slidably engaged with the lower connecting shaft slides 391 via a pair of symmetrically arranged upper connecting shafts 395. The top of the upper connecting shafts 395 is fitted into the fixed large gear ring 33.

[0028] The adjusting plate assembly 39 is a flexible connector between the fixed large gear ring 33 and the central tube 312. In the vertical direction of the adjusting plate assembly 39, a pair of symmetrically arranged lower connecting shaft slides 391 and upper connecting shaft grooves 393 are respectively provided. The fixed large gear ring 33 is slidably connected to the left and right sides of the adjusting plate assembly 39, and the front and rear sides of the adjusting plate assembly 39 are slidably connected to the central tube 312. Figure 2 Viewpoint. The downward connecting shaft 394 and the upward connecting shaft 395 slide laterally in the plane of the adjusting plate assembly 39 under the guidance of the upper connecting shaft slide groove 393 and the lower connecting shaft slide 391, respectively, and the extension lines of the sliding trajectories are perpendicular to each other.

[0029] The rotating platform assembly includes a rotating platform 38 rotatably supported on a small slewing bearing 35. The rotating platform 38 is rotatably supported on the small slewing bearing 35 by an L-shaped beam 36. The outer ring of the L-shaped beam 36 is fixed to the small slewing bearing 35, and the inner ring of the L-shaped beam 36 is fixed to the outer edge of the rotating platform 38.

[0030] The bottom flange face 381 of the rotary platform 38 is bolted to the upper surface of the hook 34. The bottom of the hook 34 is bolted to the fixed large gear ring 33, allowing the rotary platform 38 and the fixed large gear ring 33 to rotatably engage. A pair of rotary drive devices 32 are symmetrically mounted on the rotary platform 38. The output end of each rotary drive device 32 passes through the rotary platform 38 and is equipped with a drive gear 321, which meshes symmetrically with both ends of the fixed large gear ring 33. When the rotary drive device 32 drives the drive gear 321 to rotate, it is subjected to the reaction force of the fixed large gear ring 33, causing the rotary drive device 32 to push the rotary platform 38 to rotate. The rotary platform 38 is also equipped with a hook 34 for easy lifting. The rotary platform 38 is bolted to the fixed large gear ring 33 via the hook 34, which is the only component connecting the rotary platform 38 and the fixed large gear ring 33. All the gravity load of the fixed large gear ring 33 is borne by the hook 34. The fixed large gear ring 33 and the hook 34 are provided with a coaxial positioning structure. The fixed large gear ring 33 cannot rotate, while the hook 34 can rotate around the center of the central tube 312 after it is installed with the rotary platform 38.

[0031] Explanation of reference numerals in the attached drawings: 1 Support mechanism, 11 Central bearing gantry, 12 Hydraulic cylinder, 14 Receiving arm, 141 Receiving belt conveyor, 142 Lower conveyor, 143 Head roller, 15 Pitching mechanism hinge point, 16 Unloading arm, 161 Hinge point, 17 Gantry rotary table, 13 Unloading arm pitching mechanism; 2. Bucket wheel drive mechanism; 21. Wheel body assembly; 22. Short shaft assembly; 221. Short shaft; 222. End plate; 223. Reinforcing flange; 224. Fixed end shoulder; 225. Floating end shoulder; 23. End cover; 24. Fixed bearing seat; 241. Fixed end bearing; 242. Fixed end washer; 243. Fixed end cover; 244. Fixed end variable diameter positioning ring; 245. Fixed end labyrinth positioning ring; 25. Floating bearing seat; 251. Floating end bearing; 252. Floating end washer; 253. Floating end cover; 254. Floating end variable diameter positioning ring; 255. Floating end labyrinth positioning ring; 2551. Outer rubber V-ring seal; 2552. Inner rubber V-ring seal; 256. Locking disc; 26. Drive unit; 27. Receiving boom; 3. Unloading arm slewing mechanism, 31. Support base assembly, 311. Mounting seat, 312. Central tube, 32. Slewing drive device, 321. Drive gear, 33. Fixed large gear ring, 34. Hook, 35. Small slewing bearing, 36. L-beam, 37. Slewing bearing assembly, 38. Slewing platform, 381. Flange face, 39. Adjusting plate assembly, 391. Lower connecting shaft slide, 392. Adjusting plate body, 393. Upper connecting shaft groove, 394. Downward connecting shaft, 395. Upward connecting shaft; 4 Tracked walking mechanism, 5 Tensioning mechanism.

Claims

1. A bucket wheel mechanism with a small span and short shaft structure, comprising a boom, a short shaft assembly (22) floating and fixed on the boom, a drive device (26) installed at the input end of the short shaft assembly (22), and a wheel assembly (21) axled to the far drive end of the short shaft assembly (22), characterized in that: The short shaft assembly (22) is floatingly mounted on the boom, and the wheel assembly (21) is rotatably mounted on the far drive end of the short shaft assembly (22). The wheel assembly (21) and the drive unit (26) are respectively located on both sides of the floating bearing seat (25); a reinforcing flange (223) is provided on the short shaft (221). The short shaft (221) has a fixed end shoulder (224) at the far drive end. A fixed bearing housing (24) is installed at the far end of the fixed end shoulder (224). An end cover (23) is fixed to the far drive end of the fixed bearing housing (24) by bolts. A fixed end labyrinth positioning ring (245) and a fixed end through cover (243) are fitted together at the near drive end. A fixed end variable diameter positioning ring (244) limits the fixed end between the fixed end labyrinth positioning ring (245) and the fixed end shoulder (224). Fixed end gaskets (242) are respectively provided between the fixed bearing housing (24) and the end cover (23) and between the fixed bearing housing (24) and the fixed end through cover (243) for primary sealing. The fixed end bearing (241) is assembled between the fixed bearing housing (24) and the short shaft (221). The short shaft (221) has a floating end shoulder (225) at the near drive end. A floating bearing seat (25) is installed at the near end of the floating end shoulder (225). A pair of mutually cooperating floating end labyrinth positioning rings (255) and floating end covers (253) are fitted on the far drive end and the near drive end of the floating bearing seat (25). A floating end variable diameter positioning ring (254) limits the floating end between the floating end cover (253) of the far drive end and the floating end shoulder (225). A floating end washer (252) is provided between the floating bearing seat (25) and the floating end covers (253) on both sides for primary sealing. The floating end bearing (251) is assembled between the floating bearing seat (25) and the short shaft (221). A locking disc (256) is also installed between the floating bearing housing (25) and the drive unit (26); A pair of rubber V-shaped sealing rings are used for secondary sealing between the floating end cover (253) and the floating end labyrinth positioning ring (255) or between the fixed end cover (243) and the fixed end labyrinth positioning ring (245).

2. The bucket wheel mechanism with a small span and short shaft structure according to claim 1, characterized in that: The bucket wheel mechanism and the unloading arm slewing mechanism (3) are used together in the bucket wheel excavator. The unloading arm slewing mechanism (3) includes the main traveling mechanism, the support base assembly (31), the rotating platform assembly, and the adjusting plate assembly (39). The support base assembly (31) includes a central tube (312) vertically fixed on the main traveling mechanism and a mounting seat (311) fixed on the central tube (312); the rotating platform assembly includes a rotatable rotating platform (38) supported on an L-shaped beam.

3. The bucket wheel mechanism with a small span and short shaft structure according to claim 2, characterized in that: The adjusting plate assembly (39) includes an adjusting plate body (392), lower connecting shaft slides (391) symmetrically arranged on both sides of the adjusting plate body (392), and upper connecting shaft slides (393) symmetrically arranged on the other two sides of the adjusting plate body (392). The guiding directions of the lower connecting shaft slides (391) and the upper connecting shaft slides (393) are perpendicular to each other.

4. The bucket wheel mechanism with a small span and short shaft structure according to claim 2, characterized in that: The mounting base (311) is slidably fitted on the upper connecting shaft groove (393) via a pair of symmetrically arranged downward connecting shafts (394). The bottom of the downward connecting shafts (394) is fitted inside the mounting base (311). The fixed large gear ring (33) is slidably fitted on the lower connecting shaft slide (391) via a pair of symmetrically arranged upward connecting shafts (395). The top of the upward connecting shafts (395) is fitted inside the fixed large gear ring (33).

5. The bucket wheel mechanism with a small span and short shaft structure according to claim 2, characterized in that: The outer edge of the rotary platform (38) is rotatably supported on the L-shaped beam by the rotary bearing assembly (37). The bottom flange face (381) of the rotary platform (38) is fixed on the small rotary bearing (35). The bottom of the small rotary bearing (35) is installed on the fixed large gear ring (33) by bolt assembly, so that the rotary platform (38) and the fixed large gear ring (33) can be rotatably engaged. A pair of rotary drive devices (32) are symmetrically installed on the rotary platform (38). The output end of each rotary drive device (32) passes through the rotary platform (38) and is provided with a drive gear (321). The drive gear (321) meshes symmetrically at both ends of the fixed large gear ring (33).

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