Planetary gearbox of semi-direct-drive internal mixer

Abstract

The utility model discloses a semi-direct-drive internal mixer planetary gear box which comprises a machine box, an inner gear ring fixed in the machine box, a planet gear internally meshed with the inner gear ring, a planet carrier rotationally connected to the machine box, an inner gear sleeve rotationally connected to the machine box and a sun gear coaxially connected to the inner gear sleeve. The inner gear sleeve drives the sun gear to rotate around the central axis of the sun gear, the sun gear is located in the inner gear ring and meshed with the planet gear, a planet gear shaft is fixed to the planet carrier, and the inner gear ring, the planet carrier and the sun gear are coaxially arranged. The planet carrier is coaxially connected with an output shaft and drives the output shaft to rotate around the central axis of the output shaft. The output shaft is provided with a driven output gear shaft in parallel, the driven output gear shaft is in transmission connection with the output shaft, and the output shaft drives the driven output to rotate when rotating. The transmission path can be shortened, the gearbox structure is more compact, and the overall weight is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of internal mixers, in particular to a planetary gearbox of a semi-direct drive internal mixer. Background Art

[0002] The closed internal mixer (referred to as internal mixer) is a special gearbox in the rubber, tire and plastic industries and is one of the main equipment for the plasticating and mixing system of polymer materials in a closed state. The internal mixer reducer decelerates the motor speed and amplifies the torque and then transmits it to the internal mixer rotor for rubber mixing.

[0003] At present, the main reducer of the internal mixer usually includes an input shaft, a first-stage pinion, a first-stage gear, a second-stage pinion, a second-stage gear, a third-stage pinion, a third-stage gear, a speed ratio gear, a first output shaft, a second output shaft and a box body. An idle gear is arranged between a same-level pinion and gear, and the pinion, the idle gear and the gear are sequentially meshed with each other. Through the transmission and deceleration of the above multi-stage gears, the internal mixer rotor can realize rubber mixing at a low speed and high torque.

[0004] However, the transmission path of the internal mixer reducer in the above patent is long, the number of transmission stages is large and the efficiency is low. The large number of transmission stages also leads to a large number of gears. The gear part occupies a large space and has a large mass, resulting in a large size and heavy weight of the reducer box body, an uncompact structure, poor economy, a large overall volume of the reducer and a large occupied space. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a planetary gearbox of a semi-direct drive internal mixer that shortens the transmission path, makes the gearbox structure more compact and reduces the overall weight.

[0006] In order to solve the above technical problem, the planetary gearbox of the semi-direct drive internal mixer provided by the utility model adopts the following technical scheme:

[0007] A planetary gearbox of a semi-direct drive internal mixer includes a machine box, an internal gear ring fixed in the machine box, a planetary gear internally meshed with the internal gear ring, a planetary carrier rotatably connected to the machine box, an internal gear sleeve rotatably connected to the machine box, and a sun gear coaxially connected to the internal gear sleeve. The internal gear sleeve drives the sun gear to rotate around its central axis. The sun gear is located inside the internal gear ring and meshed with the planetary gear. The planetary gear shaft is fixed to the planetary carrier. The internal gear ring, the planetary carrier and the sun gear are all coaxially arranged. The planetary carrier is coaxially connected with an output shaft, and the planetary carrier drives the output shaft to rotate around its central axis. A passive output gear shaft is arranged parallel to the output shaft, and the passive output gear shaft is in transmission connection with the output shaft. When the output shaft rotates, it drives the passive output to rotate.

[0008] By adopting the above technical solution, the sun gear and the output shaft are coaxially arranged. The transmission ratio of the entire gearbox is realized by the planetary part. The high speed and low torque of the motor are converted into the low speed and high torque motion of the output shaft through the sun gear, planetary gears and planet carrier. Then, through the parallel structure of the output shaft and the passive output gear shaft, the planetary reduction plus the parallel structure transmission shortens the transmission distance, improves the operating efficiency of the gearbox, reduces the number of gears and bearings, lowers the production cost, and is more conducive to the lubrication of the entire gearbox. And by transmitting power between the motor and the sun gear through the internal gear sleeve, devices such as couplings and transmission gears can be eliminated to obtain a semi-direct drive internal mixer, further shortening the transmission path, making the gearbox structure more compact and reducing the overall weight. The planetary plus parallel structure not only meets the user's requirements for the speed ratio of the double output shafts, but also meets the requirement of an output speed of 60 rpm. The gearbox structure is compact, greatly reducing the weight, being more conducive to the lubrication of internal parts, the reducer operates smoothly, and the transmission efficiency is higher.

[0009] Optionally, both ends of the planet carrier along its axis are rotatably connected to the chassis through bearings; the sun gear is splined to the internal gear sleeve, and a connecting member is arranged between the sun gear and the planet carrier, and the connecting member is used to enable the sun gear to float axially between the internal gear sleeve and the planet carrier.

[0010] By adopting the above technical solution, the sun gear is made to float between the internal gear sleeve and the planet carrier through the connecting member to achieve load sharing; and the planet carrier is rotatable relative to the chassis through the bearings but is fixed axially. When the motor power is large, the relatively large-sized and heavy planet carrier will not generate abnormal noise and vibration relative to the chassis, so that the usage limitations of the motor power size and speed can be reduced to a certain extent, the adaptation range is wider, and the overall performance of the gearbox is better.

[0011] Optionally, the connecting member includes a floating shaft and a stop gasket fixed to the planet carrier. The floating shaft is inserted and slidably connected to the center of the sun gear, and the floating shaft will abut against the stop gasket during the sliding process.

[0012] By adopting the above technical solution, first, the sun gear can slide closer to or away from the output shaft through the floating shaft, so as to realize the floating of the sun gear between the internal gear sleeve and the planet carrier. At the same time, the stop gasket can prevent the floating shaft from abutting against the planet carrier for a long time and causing surface wear.

[0013] Optionally, an arc-shaped block is fixedly connected to one end of the floating shaft close to the stop gasket, and the most convex part of the arc-shaped block abuts against the stop gasket.

[0014] By adopting the above technical solution, since there is a clearance fit between the sun gear and the internal gear sleeve, the arc-shaped block can better adapt to the slight floating of the sun gear in the direction perpendicular to its axis and effectively reduce the friction between the floating shaft and the stop gasket.

[0015] Optionally, a driving gear is sleeved on the output shaft, and the driving gear meshes with the driven output gear shaft.

[0016] By adopting the above technical solution, the meshing transmission between the driving gear and the driven output gear shaft enables the output shaft to stably transmit torque to the driven output gear shaft in a parallel structure manner.

[0017] Optionally, an interference fit and / or a flat key connection is adopted between the output shaft and the driving gear.

[0018] By adopting the above technical solution, the connection strength between the output shaft and the driving gear is better, so as to more stably transmit the torque of the output shaft to the driven output gear shaft.

[0019] Optionally, an interference fit and a flat key connection are adopted between the output shaft and the driving gear.

[0020] Optionally, both the planet carrier and the output shaft are provided with crowned gear rings, and the crowned gear rings of the planet carrier and the output shaft mesh with each other.

[0021] By adopting the above technical solution, the crowned gear ring has the characteristics of high transmission efficiency and high reliability, thereby improving the efficiency and reliability of torque transmission between the planet carrier and the output shaft.

[0022] Optionally, the chassis includes a first box body and a second box body which are integrally designed. The output shaft and the driven output gear shaft are arranged in the first box body, the internal gear ring is arranged in the second box body, the first box body is of a split structure, and the second box body is of an integral structure in the circumferential direction.

[0023] By adopting the above technical solution, the planetary parts such as the internal gear ring and the planet carrier can be first installed in the second chassis, then the output shaft and the driven output gear shaft are installed, and finally the first box body part is assembled, which improves the convenience of gearbox assembly and maintenance.

[0024] Optionally, end covers are sleeved on the bearings of the output shaft, the driven output gear shaft and the internal gear sleeve, the end covers are fixed to the chassis, and oil slingers or oil seals are arranged between the bearings of the output shaft, the driven output gear shaft and the internal gear sleeve and the end covers.

[0025] By adopting the above technical solution, it can prevent the internal lubricating medium of the gearbox from leaking from the bearings, so as to facilitate forced lubrication of the entire gearbox.

[0026] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0027] 1. The planetary deceleration plus parallel structure drive shortens the drive distance, improves the operating efficiency of the gearbox, reduces the number of gears and bearings, lowers the production cost, and is more conducive to the lubrication of the entire gearbox;

[0028] 2. The power transmission between the motor and the sun gear through the internal gear sleeve can eliminate devices such as couplings and transmission gears, so as to obtain a semi-direct drive internal mixer, further shortening the transmission path, making the gearbox structure more compact and reducing the overall weight;

[0029] 3. The planet carrier can rotate relative to the machine case through the bearing but is fixed along its axial direction. When the motor power is large, the relatively large-sized and heavy planet carrier will not generate abnormal noise and vibration relative to the machine case, so that the use limitations of the motor power and speed can be reduced to a certain extent, the adaptation range is wider, and the overall performance of the gearbox is better.

[0030] 4. The internal structure of the gearbox is compact, the transmission distance is short, the transmission efficiency is high, the box body is regular, which is more conducive to the centralized lubrication of internal gear parts, splines, and bearings everywhere, improves the use conditions of the entire gear, and extends the service life. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of the planetary gearbox of the semi-direct drive internal mixer in the present utility model.

[0032] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0033] Description of the reference numerals: 1, internal gear sleeve; 2, sun gear; 21, floating shaft; 22, stop gasket; 3, planet carrier; 4, internal gear ring; 5, planet gear; 6, driving gear; 7, output shaft; 8, passive output gear shaft; 9, machine case; 10, end cover. Detailed Description of the Invention

[0034] The following further describes the present utility model in detail with reference to the attached Figure 1-2 drawings.

[0035] The embodiment of the present utility model discloses a planetary gearbox of a semi-direct drive internal mixer. Refer to Figure 1, the planetary gearbox of the semi-direct drive internal mixer includes a machine case 9, an internal gear sleeve 1, an internal gear ring 4, a sun gear 2, a planet carrier 3, planet gears 5, an output shaft 7, and a passive output gear shaft 8. The internal gear sleeve 1 is rotatably connected to the machine case 9 through bearings, and a part of the internal gear sleeve 1 extends out of the machine case 9. The sun gear 2 is splined to one end of the internal gear sleeve 1 located inside the machine case 9, and the sun gear 2 and the internal gear sleeve 1 are arranged on the same central axis. The internal gear ring 4 is fixedly arranged on the machine case 9 using bolts and pins, the internal gear ring 4 and the internal gear sleeve 1 are arranged on the same central axis, and the sun gear 2 is located on the central axis of the internal gear ring 4. The planet gears 5 are simultaneously meshed with the sun gear 2 and the internal gear ring 4. The number of planet gears 5 can be 3 - 5, and in the embodiment of the present application, the number of planet gears 5 is 3.

[0036] Refer to Figure 1 , the planet carrier 3 is located inside the internal gear ring 4. The planet carrier 3 is rotatably connected to the machine case 9, and the planet carrier 3 and the internal gear ring 4 are arranged on the same central axis. The sun gear 2 is located inside the planet carrier 3, and the sun gear 2 and the planet carrier 3 are arranged on the same central axis. The axles of the 3 planet gears 5 are simultaneously fixedly connected to the planet carrier 3. A drum-shaped tooth gear ring is arranged at one end of the planet carrier 3 away from the internal gear sleeve 1.

[0037] Refer to Figure 1 , both the output shaft 7 and the passive output gear shaft 8 are rotatably connected to the machine case 9 through bearings. The output shaft 7 and the planet carrier 3 are arranged on the same central axis. A drum-shaped tooth gear ring is arranged at one end of the output shaft 7 close to the planet carrier 3, and the drum-shaped tooth gear rings of the planet carrier 3 and the output shaft 7 are meshed with each other. The drum-shaped tooth gear ring has the characteristics of high transmission efficiency and high reliability, thereby improving the efficiency and reliability of torque transmission between the planet carrier 3 and the output shaft 7.

[0038] Refer to Figure 1 , the passive output gear shaft 8 is arranged parallel to the output shaft 7. An active gear 6 is sleeved on the output shaft 7. An interference fit and a flat key connection are adopted between the output shaft 7 and the active gear 6, that is, the output shaft 7 is provided with a slot, the active gear 6 is fixed with a flat key, and the flat key is embedded in the slot. At the same time, an interference fit exists between the output shaft 7 and the active gear 6. The active gear 6 and the passive output gear shaft 8 are meshed with each other. Through the meshing transmission of the active gear 6 and the passive output gear shaft 8, the output shaft 7 can stably transmit torque to the passive output gear shaft 8 in a parallel structure manner.

[0039] Refer to Figure 1, the sun gear 2 and the output shaft 7 are coaxially arranged, and the transmission ratio of the entire gearbox is realized by the planetary part. The high speed and low torque of the motor are converted into the low speed and high torque motion of the output shaft 7 through the sun gear 2, the planetary gear 5 and the planet carrier 3. Then, through the parallel structure of the output shaft 7 and the passive output gear shaft 8, the planetary reduction plus parallel structure transmission shortens the transmission distance, improves the operating efficiency of the gearbox, reduces the number of gears and bearings, reduces the production cost, and is more conducive to the lubrication of the entire gearbox. And through the inner gear sleeve 1 to transmit power between the motor and the sun gear 2, devices such as couplings and transmission gears can be eliminated to obtain a semi-direct drive internal mixer, further shortening the transmission path, making the gearbox structure more compact and reducing the overall weight.

[0040] Referring to Figure 1 and Figure 2 , since the planet carrier 3 is usually large in size and heavy in weight, when the planet carrier 3 rotates at a high speed, it is easy to cause noise and vibration. Therefore, both ends of the planet carrier 3 along its axis are rotatably connected to the chassis 9 through cylindrical roller bearings, and a connecting piece is provided between the sun gear 2 and the planet carrier 3. The connecting piece includes a floating shaft 21 and a stop gasket 22. The stop gasket 22 is fixed to the planet carrier 3. The floating shaft 21 is inserted and slidably connected to the center of the sun gear 2, and the floating shaft 21 will abut against the stop gasket 22. One end of the floating shaft 21 close to the stop gasket 22 is fixedly connected with a cambered surface block. During the sliding process of the floating shaft 21, the most convex part of the cambered surface block will abut against the stop gasket 22.

[0041] First, the sun gear 2 can slide closer to or away from the planet carrier 3 through the floating shaft 21, so as to realize the floating of the sun gear 2 between the inner gear sleeve 1 and the planet carrier 3 to achieve load sharing; at the same time, the stop gasket 22 can prevent the floating shaft 21 from abutting against the planet carrier 3 for a long time and causing surface wear. And through the bearing, the planet carrier 3 can rotate relative to the chassis 9 but is fixed along its axis. When the motor power is large, the larger and heavier planet carrier 3 will not generate abnormal noise and vibration relative to the chassis 9, so that the use limitations of the motor power and speed can be reduced to a certain extent, the adaptation range is wider, and the overall performance of the gearbox is better. And because there is a clearance fit between the sun gear 2 and the inner gear sleeve 1, the cambered surface block can better adapt to the slight floating of the sun gear 2 in the direction perpendicular to its axis, and effectively reduce the friction degree between the floating shaft 21 and the stop gasket 22.

[0042] Referring to Figure 1 , a connecting piece is also provided between the planet carrier 3 and the output shaft 7. The stop gasket 22 is fixed to the planet carrier, the floating shaft 21 is inserted and slidably connected to the center of the output shaft 7, and the floating shaft 21 will abut against the stop gasket 22.

[0043] Referring to Figure 1, end caps 10 are provided on the shafts of the output shaft 7, the driven output gear shaft 8, and the bearing outer sleeve of the internal gear sleeve 1. Oil seals are provided between the output shaft 7 and the end cap 10, between the shaft of the driven output gear shaft 8 and the end cap 10, and between the bearing of the internal gear sleeve 1 and the end cap 10. The oil seals between the output shaft 7 and the end cap 10 and between the shaft of the driven output gear shaft 8 and the end cap 10 can use skeleton oil seals or oil slinger seals to seal the oil, and the oil seal between the bearing of the internal gear sleeve 1 and the end cap 10 uses a double-layer O-ring to seal the oil. Adjusting pads are designed on the outer sides of the bearings of the output shaft 7, the driven output gear shaft 8, and the internal gear sleeve 1 to adjust the axial clearance of the entire shaft.

[0044] Refer to Figure 1 , the chassis 9 includes a first box body and a second box body with an integrated design. The output shaft 7 and the driven output gear shaft 8 are arranged in the first box body, and the internal gear ring 4 is arranged in the second box body. The first box body is a split structure, that is, the first box body includes two shells connected by bolts, and the two shells are assembled to form an integral structure in the circumferential direction; the second box body is an integral structure in the circumferential direction. The planetary parts such as the internal gear ring 4 and the planet carrier 3 can be installed in the chassis 9 first, then the output shaft 7 and the driven output gear shaft 8 are installed, and finally the part of the chassis 9 where the output shaft 7 and the driven output gear shaft 8 are located is assembled, which improves the convenience of gearbox assembly and maintenance.

[0045] The lubrication method of forced lubrication is adopted inside the box body. An external oil station with a cooler and a filter is used, and forced lubrication is carried out in cooperation with the internal pipe system. An oil return flange and a magnetic oil drain plug are designed at the lowest part of the box body to pump the high-temperature lubricating oil back to the oil station for cooling and filtering and other treatments.

[0046] The implementation principle of a planetary gearbox of a semi-direct drive internal mixer according to an embodiment of the present invention is as follows: The sun gear 2 and the output shaft 7 are coaxially arranged. The transmission ratio of the entire gearbox is realized by the planetary part. The high speed and low torque of the motor are converted into the low speed and large torque motion of the output shaft 7 through the sun gear 2, the planet gear 5, and the planet carrier 3; then through the parallel structure of the output shaft 7 and the driven output gear shaft 8, the planetary reduction plus the parallel structure transmission shortens the transmission distance, improves the operating efficiency of the gearbox, reduces the number of gears and bearings, reduces the production cost, and is also more conducive to the lubrication of the entire gearbox. And the power is transmitted between the motor and the sun gear 2 through the internal gear sleeve 1, and devices such as couplings and transmission gears can be omitted to obtain a semi-direct drive internal mixer, further shortening the transmission path, making the gearbox structure more compact and reducing the overall weight.

[0047] The sun gear 2 floats between the internal gear sleeve 1 and the output shaft 7 to achieve load sharing; and through the bearings, the planet carrier 3 can rotate relative to the chassis 9 but is fixed axially. When the motor power is large, the planet carrier 3 with a large size and heavy weight will not generate abnormal noise and vibration relative to the chassis 9, thereby being able to reduce the usage limitations of the motor power and speed to a certain extent, having a wider adaptation range, and better overall performance of the gearbox.

[0048] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A planetary gearbox for a semi-direct drive internal mixer, characterized in that: The invention comprises a chassis (9), an inner gear ring (4) fixed in the chassis (9), a planetary gear (5) meshed with the inner gear ring (4), a planetary carrier (3) rotatably connected to the chassis (9), an inner gear sleeve (1) rotatably connected to the chassis (9), and a sun gear (2) coaxially connected to the inner gear sleeve (1), wherein the inner gear sleeve (1) drives the sun gear (2) to rotate around its central axis, the sun gear (2) is located in the inner gear ring (4) and meshed with the planetary gear (5), and the planetary gear (5) The wheel axle is fixed to the planetary carrier (3), and the inner gear ring (4), the planetary carrier (3) and the sun gear (2) are all arranged coaxially; the planetary carrier (3) is coaxially connected to an output shaft (7), and the planetary carrier (3) drives the output shaft (7) to rotate around its central axis; a passive output gear shaft (8) is arranged in parallel with the output shaft (7), and the passive output gear shaft (8) is transmission-connected to the output shaft (7), and the output shaft (7) drives the passive output to rotate.

2. The planetary gearbox of a semi-direct drive internal mixer according to claim 1, characterized in that: Both ends of the planet carrier (3) along its axis are rotatably connected to the chassis (9) via bearings; the sun gear (2) is spline-connected to the inner gear sleeve (1); a connecting piece is provided between the sun gear (2) and the planet carrier (3); the connecting piece is used to allow the sun gear (2) to float along its axial direction between the inner gear sleeve (1) and the planet carrier (3).

3. The planetary gearbox for a semi-direct drive internal mixer according to claim 2, characterized in that: The connecting member comprises a floating shaft (21) and a stop washer (22) fixed to the planetary frame (3); the floating shaft (21) is plugged into and slidably connected to the axis of the sun gear (2); and the floating shaft (21) abuts against the stop washer (22) during the sliding process.

4. A planetary gearbox for a semi-direct drive internal mixer according to claim 3, characterized in that: One end of the floating shaft (21) close to the stop washer (22) is fixedly connected to a cambered block, and the most convex part of the cambered block abuts against the stop washer (22).

5. A planetary gearbox of a semi-direct drive internal mixer according to claim 1, characterized in that: The outer shell of the output shaft (7) is provided with a driving gear (6), and the driving gear (6) and the passive output gear shaft (8) are meshed with each other.

6. A planetary gearbox of a semi-direct drive internal mixer according to claim 5, characterized in that: The output shaft (7) and the driving gear (6) are connected by interference fit and / or flat key.

7. A planetary gearbox for a semi-direct drive internal mixer according to claim 6, characterized in that: The output shaft (7) and the driving gear (6) are connected by interference fit and flat key.

8. A planetary gearbox for a semi-direct drive internal mixer according to claim 1 or 2, characterized in that: The planet carrier (3) and the output shaft (7) are both provided with drum-shaped gear rings, and the drum-shaped gear rings of the planet carrier (3) and the output shaft (7) are meshed with each other.

9. A planetary gearbox for a semi-direct drive internal mixer according to claim 1 or 2, characterized in that: The chassis (9) comprises an integrated first housing and a second housing, the output shaft (7) and the passive output gear shaft (8) are arranged in the first housing, the inner gear ring (4) is arranged in the second housing, the first housing is a split structure, and the second housing is a circumferentially integral structure.

10. A planetary gearbox of a semi-direct drive internal mixer according to claim 1 or 2, characterized in that: The output shaft (7), the shaft of the passive output gear shaft (8) and the bearing of the inner gear sleeve (1) are all provided with an end cover (10) on their outer sleeves. The end cover (10) is fixed to the chassis (9). The output shaft (7), the shaft of the passive output gear shaft (8) and the bearing of the inner gear sleeve (1) are all provided with an oil slinger or an oil seal between the end cover (10).

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