A centralized drive system for bucket elevators

Abstract

This utility model discloses a centralized drive system for a bucket elevator, including an axial flux motor, a multi-stage planetary gear transmission structure, and an output shaft connected to the output end of the multi-stage planetary gear transmission structure. The multi-stage planetary gear transmission structure is housed within a transmission housing formed by splicing an input housing and an output housing. The input end of the multi-stage planetary gear transmission structure passes through the input housing and is connected to the motor shaft of the axial flux motor. The gear ring of each stage of the multi-stage planetary gear transmission structure is fixed to the transmission housing, and the input and output torque are transmitted through the corresponding sun gear. This utility model uses a high-power-density, highly compact axial flux motor to replace the three-phase asynchronous motor and radial flux motor, combined with a compact multi-stage planetary gear reduction module, which significantly reduces the system weight and volume, greatly improves transmission efficiency, and enhances operational safety.

Description

Technical Field

[0001] This utility model relates to the field of bucket elevator technology, specifically to a centralized drive system for a bucket elevator. Background Technology

[0002] Current bucket elevator drive systems generally employ a combination of a three-phase asynchronous motor, coupling, and parallel shaft reducer. This results in problems such as large size and weight, difficulty in installation and alignment, low transmission efficiency, and high energy consumption. The low transmission efficiency is primarily due to the inherent efficiency limitations of the three-phase asynchronous motor (e.g., high rotor copper and iron losses, low power factor, poor low-speed performance), efficiency losses in the parallel shaft reducer (multi-stage gear transmission), and efficiency losses in the coupling. Furthermore, the parallel shaft layout requires sequential arrangement of gear shafts, resulting in a long axial dimension, and the need for cast iron / cast steel housings to withstand high torque, leading to a bulky overall machine (30%~50% heavier than a planetary reducer of the same power). Alignment difficulties are mainly due to the limited compensation capacity of the coupling and the stringent alignment tolerances of the parallel shaft gears. Utility Model Content

[0003] Technical objective: To address the shortcomings of existing bucket elevator drive systems, this utility model discloses a centralized drive system for bucket elevators that can significantly reduce system weight and volume and greatly improve transmission efficiency.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A centralized drive system for a bucket elevator includes an axial flux motor, a multi-stage planetary gear transmission structure, and an output shaft connected to the output end of the multi-stage planetary gear transmission structure. The multi-stage planetary gear transmission structure is housed within a transmission housing formed by splicing an input housing and an output housing. The input end of the multi-stage planetary gear transmission structure passes through the input housing and is connected to the motor shaft of the axial flux motor. The ring gear of each stage of the planetary gear set in the multi-stage planetary gear transmission structure is fixed to the transmission housing, and the input and output torque are transmitted through the corresponding sun gear.

[0006] Preferably, the present invention provides a ring tube cooling mechanism for cooling the axial flux motor inside the transmission housing. The ring tube cooling mechanism includes a ring tube arranged around the motor shaft. The ring tube is fixed inside the input box by a support plate. The input box is provided with through holes corresponding to the inlet and outlet ends of the ring tube for installing pipe joints. The pipe joints are fixed on the input box and communicate with the ring tube to circulate the cooling water inside the ring tube.

[0007] Preferably, a backstop is connected to one end of the motor shaft of the present invention that is away from the multi-stage planetary gear transmission structure. The motor shaft is fixedly connected to the inner ring of the backstop, and the backstop locks the reverse rotation of the motor shaft.

[0008] Preferably, the multi-stage planetary gear transmission structure of the present invention is a three-stage planetary transmission, including a high-speed planetary gear set, an intermediate planetary gear set, and a low-speed planetary gear set arranged sequentially along the motor shaft to the output shaft. Adjacent planetary gear sets are connected to the planetary gears of the previous planetary gear set and the sun gear of the next planetary gear set through corresponding carriers to transmit torque.

[0009] Preferably, the high-speed planetary gear set of the present invention includes a high-speed ring gear, high-speed planetary gears, a high-speed sun gear, a high-speed carrier, and a high-speed planetary bearing. The high-speed ring gear is fixedly connected to the input housing, the high-speed sun gear is keyed to the motor shaft, the high-speed planetary gears are mounted on the high-speed carrier through the high-speed planetary bearings and mesh with the high-speed ring gear and the high-speed sun gear, and the high-speed carrier is keyed to the sun gear of the intermediate planetary gear set.

[0010] Preferably, the intermediate planetary gear set of the present invention includes an intermediate planetary gear, an intermediate gear ring, an intermediate planetary bearing, an intermediate carrier, and an intermediate sun gear. The intermediate gear ring is fixedly connected to the output housing, the intermediate sun gear is keyed to the carrier of the high-speed planetary gear set, the intermediate planetary gear is mounted on the intermediate carrier through the intermediate planetary bearing and meshes with the intermediate gear ring and the intermediate sun gear, and the intermediate carrier is keyed to the sun gear of the low-speed planetary gear set.

[0011] Preferably, the low-speed planetary gear set of the present invention includes low-speed planetary gears, a low-speed ring gear, a low-speed planetary bearing, a low-speed carrier, and a low-speed sun gear. The low-speed ring gear is fixedly connected to the output housing, the low-speed sun gear is keyed to the carrier of the intermediate planetary gear set, the low-speed planetary gears are mounted on the low-speed carrier through the low-speed planetary bearing and mesh with the low-speed ring gear and the low-speed sun gear, and the low-speed carrier is keyed to the output shaft.

[0012] Preferably, the input housing of the present invention is provided with an input cover that cooperates with the motor shaft for sealing, and the output housing is provided with an output cover that cooperates with the output shaft, thereby maintaining the closure of the transmission housing through the input cover and the output cover.

[0013] Beneficial effects: The centralized drive system for bucket elevators disclosed in this utility model has the following beneficial effects:

[0014] 1. This utility model uses a high-power-density, highly compact axial flux motor to replace the three-phase asynchronous motor and radial flux motor, and combines it with a compact multi-stage planetary gear reduction module, which significantly reduces the system weight and volume and greatly improves the transmission efficiency.

[0015] 2. The new utility model's ring-pipe cooling mechanism effectively reduces system temperature rise and prevents motor demagnetization through its built-in cooling module.

[0016] 3. The planetary gear set carrier of this utility model adopts a single-arm carrier form, which can effectively improve the structural rigidity, transmission accuracy and reliability; a backstop is set up to have a backstop function, and the shaft system is self-locked through the backstop, thereby ensuring the working reliability of the drive system.

[0017] 4. The planetary gear transmission of the present invention, which is arranged in a fully axial direction, avoids the problems of volume expansion and weight increase caused by the bevel gear steering structure. At the same time, the planetary gear transmission structure has a higher power density than the parallel shaft reducer, effectively solving the problem of low overall efficiency caused by the difficulty of coupling alignment and multi-stage gear loss in the traditional solution. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the drive system structure of this utility model;

[0020] Among them, 1-axial flux motor, 2-multi-stage planetary gear transmission structure, 3-backstop, 4-support plate, 5-ring tube cooling mechanism, 6-input housing, 7-pipe joint, 8-through hole, 9-high-speed planetary gear, 10-high-speed planetary bearing, 11-high-speed rotating frame, 12-intermediate planetary gear, 13-intermediate gear ring, 14-intermediate planetary bearing, 15-intermediate rotating frame, 16-low-speed planetary gear, 17-low-speed gear ring, 18-low-speed planetary bearing, 19-low-speed rotating frame, 20-bearing, 21-output housing, 22-support base, 23-output shaft, 24-output cover, 25-low-speed sun gear, 26-intermediate sun gear, 27-high-speed gear ring, 28-high-speed sun gear, 29-input cover, 30-fixed base, 31-ring tube, 32-motor shaft. Detailed Implementation

[0021] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0022] like Figure 1As shown, this utility model discloses a centralized drive system for a bucket elevator, including an axial flux motor 1, a multi-stage planetary gear transmission structure 2, and an output shaft 23 connected to the output end of the multi-stage planetary gear transmission structure 2. The multi-stage planetary gear transmission structure 2 is housed within a transmission housing formed by splicing an input housing 6 and an output housing 21. The input end of the multi-stage planetary gear transmission structure 2 passes through the input housing 6 and is connected to the motor shaft 32 of the axial flux motor 1. The input housing 6 is provided with an input cover 29 that cooperates with the motor shaft 32 for sealing, and the output housing 21 is provided with an output cover 24 that cooperates with the output shaft 23. The input cover 29 and the output cover 24 keep the transmission housing closed. The gear ring of each stage of the planetary gear set of the multi-stage planetary gear transmission structure 2 is fixed to the transmission housing, and the input and output torque are transmitted through the corresponding sun gear. A support base 22 is provided below the input housing 6 or the output housing 21 to support the entire drive system, thereby maintaining the stability of the elevator.

[0023] The multi-stage planetary gear transmission structure 2 of the present invention is a three-stage planetary transmission, and the number of stages of the planetary transmission can be increased or decreased as needed. In the embodiments of the present invention, the multi-stage planetary gear transmission structure 2 includes a high-speed planetary gear set, an intermediate planetary gear set, and a low-speed planetary gear set arranged sequentially along the motor shaft 32 to the output shaft 23. Adjacent planetary gear sets are connected to the planetary gears of the previous planetary gear set and the sun gear of the next planetary gear set through corresponding carriers to transmit torque. The connection between the shaft and the sun gear, and between the carrier and the sun gear, can be a solid shaft with a flat key. For some applications where the load-bearing capacity of the shaft is less important, a hollow shaft with a locking disc can also be used for connection and transmission.

[0024] In an embodiment of the present invention, to meet the needs of heavy-duty bucket elevators in mining, cement, and grain processing fields, a solid shaft with a flat key connection method is used. Specifically, the high-speed planetary gear set of the present invention includes a high-speed gear ring 27, high-speed planetary gears 9, a high-speed sun gear 28, a high-speed rotating frame 11, and a high-speed planetary bearing 10. The high-speed gear ring 27 is fixedly connected to the input housing 6, the high-speed sun gear 28 is keyed to the motor shaft 32, the high-speed planetary gear 9 is mounted on the high-speed rotating frame 11 through the high-speed planetary bearing 10 and meshes with the high-speed gear ring 27 and the high-speed sun gear 28, and the high-speed rotating frame 11 is keyed to the sun gear of the intermediate planetary gear set.

[0025] The intermediate planetary gear set of the present invention includes an intermediate planetary gear 12, an intermediate gear ring 13, an intermediate planetary bearing 14, an intermediate carrier 15, and an intermediate sun gear 26. The intermediate gear ring 13 is fixedly connected to the output housing 21, and the intermediate sun gear 26 is keyed to the carrier of the high-speed planetary gear set. The intermediate planetary gear 12 is mounted on the intermediate carrier 15 through the intermediate planetary bearing 14 and meshes with the intermediate gear ring 13 and the intermediate sun gear 26. The intermediate carrier 15 is keyed to the sun gear of the low-speed planetary gear set.

[0026] The low-speed planetary gear set of the present invention includes a low-speed planetary gear 16, a low-speed ring gear 17, a low-speed planetary bearing 18, a low-speed carrier 19, and a low-speed sun gear 25. The low-speed ring gear 17 is fixedly connected to the output housing 21, and the low-speed sun gear 25 is keyed to the carrier of the intermediate planetary gear set. The low-speed planetary gear 16 is mounted on the low-speed carrier 19 through the low-speed planetary bearing 18 and meshes with the low-speed ring gear 17 and the low-speed sun gear 25. The low-speed carrier 19 is keyed to the output shaft 23.

[0027] In the case of using an axial flux motor 1, in order to avoid demagnetization due to high temperature during operation and affect the normal operation of the motor, the present invention provides a ring tube cooling mechanism 5 for cooling the axial flux motor 1 inside the transmission housing. The ring tube cooling mechanism 5 includes a ring tube 31 arranged around the motor shaft 32. The ring tube 31 is fixed inside the input housing 6 by a support plate 4. The input housing 6 is provided with through holes 8 corresponding to the inlet and outlet ends of the ring tube 31 for installing pipe joints 7. The pipe joints 7 are fixed on the input housing 6 and communicate with the ring tube 31 to circulate the cooling water inside the ring tube 31.

[0028] The present invention also has a backstop 3 connected to one end of the motor shaft 32 away from the multi-stage planetary gear transmission structure 2. The inner ring of the motor shaft 32 is fixedly connected to the backstop 3. The backstop 3 locks the reverse rotation of the motor shaft 32, so as to improve the safety of the hoist during the lifting of heavy objects. The outer ring of the backstop 3 is connected to the fixed base 30 set below to keep the position of the backstop 3 stable.

[0029] In the centralized drive system of the bucket elevator of the present invention, the high-speed sun gear 28 receives the input torque of the motor through a spline connection with the motor shaft 32 of the axial flux motor. The high-speed sun gear 28 drives the high-speed planetary gear 9 to rotate by meshing with the teeth of the high-speed planetary gear 9. Since the high-speed gear ring 37 is fixed, the high-speed planetary gears are forced to rotate within the high-speed gear ring 37, that is, the high-speed planetary gear 9 revolves around the high-speed sun gear 28, driving the high-speed rotating frame 11 to rotate together. The input torque of the axial flux motor 1 is amplified for the first time by the high-speed planetary gear set and then transmitted to the intermediate sun gear 26 through the high-speed rotating frame 11. Similar to the high-speed stage planetary gear set, in the intermediate stage planetary gear set and the low-speed stage planetary gear set, the gear ring is also fixed, and the torque is input and output through the sun gear and the single-arm rotating frame respectively. Finally, the torque is transmitted to the output shaft 23 through three stages of planetary transmission. The multi-stage planetary transmission increases the transmitted torque step by step, thereby better meeting the requirements of heavy-load start-up and continuous stable operation of the bucket elevator.

[0030] When lifting materials, especially when fully loaded, the hopper is prone to slipping under gravity. The installed backstop 3 can lock the motor shaft 32 in the reverse direction, thereby effectively preventing damage to the drive motor, planetary gear module and other components by reverse impact force, thus ensuring the working reliability of the drive system and improving the safety of use.

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A centralized drive system for a bucket elevator, characterized in that, The system includes an axial flux motor (1), a multi-stage planetary gear transmission structure (2), and an output shaft (23) connected to the output end of the multi-stage planetary gear transmission structure (2). The multi-stage planetary gear transmission structure (2) is set in a transmission housing formed by splicing an input housing (6) and an output housing (21). The input end of the multi-stage planetary gear transmission structure (2) passes through the input housing (6) and is connected to the motor shaft (32) of the axial flux motor (1). The gear ring of each stage of the multi-stage planetary gear transmission structure (2) is fixed to the transmission housing, and the input and output torque are transmitted through the corresponding sun gear.

2. The centralized drive system for a bucket elevator according to claim 1, characterized in that, A ring tube cooling mechanism (5) for cooling the axial flux motor (1) is provided in the transmission housing. The ring tube cooling mechanism (5) includes a ring tube (31) arranged around the motor shaft (32). The ring tube (31) is fixed inside the input box (6) by a support plate (4). The input box (6) is provided with through holes (8) corresponding to the inlet and outlet ends of the ring tube (31) for installing pipe joints (7). The pipe joints (7) are fixed on the input box (6) and communicate with the ring tube (31) to circulate the cooling water in the ring tube (31).

3. The centralized drive system for a bucket elevator according to claim 1, characterized in that, The motor shaft (32) is connected to a backstop (3) at one end away from the multi-stage planetary gear transmission structure (2). The inner ring of the motor shaft (32) is fixedly connected to the backstop (3), and the backstop (3) locks the reverse rotation of the motor shaft (32).

4. The centralized drive system for a bucket elevator according to claim 1, characterized in that, The multi-stage planetary gear transmission structure (2) is a three-stage planetary transmission, including a high-speed planetary gear set, an intermediate planetary gear set and a low-speed planetary gear set arranged sequentially along the motor shaft (32) to the output shaft (23). Adjacent planetary gear sets are connected to the planetary gears of the previous planetary gear set and the sun gear of the next planetary gear set through corresponding carriers to transmit torque.

5. A centralized drive system for a bucket elevator according to claim 4, characterized in that, The high-speed planetary gear set includes a high-speed ring gear (27), high-speed planetary gears (9), a high-speed sun gear (28), a high-speed carrier (11), and a high-speed planetary bearing (10). The high-speed ring gear (27) is fixedly connected to the input housing (6), the high-speed sun gear (28) is keyed to the motor shaft (32), the high-speed planetary gear (9) is mounted on the high-speed carrier (11) through the high-speed planetary bearing (10) and meshes with the high-speed ring gear (27) and the high-speed sun gear (28). The high-speed carrier (11) is keyed to the sun gear of the intermediate planetary gear set.

6. A centralized drive system for a bucket elevator according to claim 4, characterized in that, The intermediate planetary gear set includes an intermediate planetary gear (12), an intermediate gear ring (13), an intermediate planetary bearing (14), an intermediate carrier (15), and an intermediate sun gear (26). The intermediate gear ring (13) is fixedly connected to the output housing (21). The intermediate sun gear (26) is keyed to the carrier of the high-speed planetary gear set. The intermediate planetary gear (12) is mounted on the intermediate carrier (15) through the intermediate planetary bearing (14) and meshes with the intermediate gear ring (13) and the intermediate sun gear (26). The intermediate carrier (15) is keyed to the sun gear of the low-speed planetary gear set.

7. A centralized drive system for a bucket elevator according to claim 4, characterized in that, The low-speed planetary gear set includes a low-speed planetary gear (16), a low-speed ring gear (17), a low-speed planetary bearing (18), a low-speed carrier (19), and a low-speed sun gear (25). The low-speed ring gear (17) is fixedly connected to the output housing (21), and the low-speed sun gear (25) is keyed to the carrier of the intermediate planetary gear set. The low-speed planetary gear (16) is mounted on the low-speed carrier (19) through the low-speed planetary bearing (18) and meshes with the low-speed ring gear (17) and the low-speed sun gear (25). The low-speed carrier (19) is keyed to the output shaft (23).

8. A centralized drive system for a bucket elevator according to claim 1, characterized in that, The input housing (6) is provided with an input cover (29) that cooperates with the motor shaft (32) for sealing, and the output housing (21) is provided with an output cover (24) that cooperates with the output shaft (23). The transmission housing is kept closed by the input cover (29) and the output cover (24).

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