CN213176673U

CN213176673U - Speed reducer for plastic screw extruder

Info

Publication number: CN213176673U
Application number: CN202022123295.5U
Authority: CN
Inventors: 张明荣
Original assignee: TAIXING SPEED REDUCER CO Ltd
Current assignee: TAIXING SPEED REDUCER CO Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-05-11
Anticipated expiration: 2030-09-24

Abstract

The utility model relates to a speed reducer field provides speed reducer for plastics screw extruder. The oil thrower and the oil groove are used for actively lubricating and cooling each bearing so as to adapt to the high-temperature environment of the extruder and avoid the high-temperature damage of the bearing; the output shaft is supported by three groups of thrust bearings, and the output shaft is axially limited at the shaft end through limiting nuts and limiting rings at two ends; the bearings and the gears are limited by parts such as stop washers and adjusting limiting rings to prevent axial movement of the parts, axial extrusion resistance of the output shaft is improved, and the service life of the output shaft is prolonged.

Description

Speed reducer for plastic screw extruder

Technical Field

The utility model relates to a speed reducer field, concretely relates to speed reducer for plastics screw extruder.

Background

The screw extruder speed reducer is mainly applied to the rubber plastic extruder industry, and an output shaft of the speed reducer is subjected to great inward axial extrusion thrust, so that the requirements on a bearing and sealing are high. The bearing and the gear are easy to wear and shift, and the service life is influenced. Meanwhile, because the temperature of the screw of the extruder is high, the reduction gearbox needs to be fully lubricated and cooled, otherwise, the service life of the bearing is easily shortened.

Disclosure of Invention

For overcoming among the prior art speed reducer output shaft for the plastic screw extruder because of bearing the bearing that radial force is great and service environment temperature is high and the bearing that leads to and the wearing and tearing scheduling problem of axle, the utility model discloses a, aim at provides a speed reducer for the plastic screw extruder.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

the speed reducer for the plastic screw extruder comprises a box body, wherein the box body consists of an upper box body and a lower box body, an input shaft, an intermediate shaft and an output shaft are arranged between the upper box body and the lower box body, the intermediate shaft is driven by an input gear pair, the intermediate shaft is driven by an output gear pair, the output shaft is a hollow shaft, an external thread is processed at one end of the output shaft, a limit ring is processed at the other end of the output shaft, the output shaft is supported on the box body by a first bearing, a second bearing and a third bearing, the first bearing and the second bearing are arranged on the side wall of the box body, the third bearing is arranged in an output cavity protruding out of the box body, the outer side of the first bearing is limited by a limit nut matched with the external thread, the inner side of the first bearing and a bearing of the output gear pair arranged on the output shaft are limited by a stop washer, the inner side of the second, the outer side of the second bearing is limited by an adjusting ring with the third bearing, and the outer side of the third bearing is limited by a limiting ring of the output shaft.

Further, the output cover of output shaft has the oil baffle, the oil baffle is installed in the outside of spacing ring, install the skeleton oil blanket between the hole of oil baffle and output shaft, install the sealing washer between the outside of oil baffle and the inner wall in output chamber.

Furthermore, an oil thrower is coaxially installed on the input shaft, a circle of oil groove is formed in the top surface of the lower box body, and the oil groove guides bearings corresponding to the input shaft, the intermediate shaft and the output shaft.

Still further, the first, second and third bearings are thrust bearings.

After taking above technical scheme, the beneficial effects of the utility model are that: the oil thrower and the oil groove are used for actively lubricating and cooling each bearing so as to adapt to the high-temperature environment of the extruder and avoid the high-temperature damage of the bearing; the output shaft is supported by three groups of thrust bearings, and the output shaft is axially limited at the shaft end through limiting nuts and limiting rings at two ends; the bearings and the gears are limited by parts such as stop washers and adjusting limiting rings to prevent axial movement of the parts, axial extrusion resistance of the output shaft is improved, and the service life of the output shaft is prolonged.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a cross-sectional view of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:

as shown in the figure, the speed reducer for the plastic screw extruder comprises an upper box body 1, a lower box body 2, an input shaft 3, an input gear 4, an intermediate shaft 5, a first intermediate gear 6, a second intermediate gear 7, an output shaft 8, an output gear 9 and the like, wherein the input shaft 3 is meshed with the first intermediate gear 6 on the intermediate shaft 5 through the input gear 4, and the second intermediate gear 7 on the intermediate shaft 5 is meshed with the output gear 9 on the output shaft 8 to complete transmission. The input shaft 3 and the intermediate shaft 5 are respectively supported between the upper and lower box bodies 1,2 by a pair of thrust bearings, the outer sides of the bearings are respectively provided with a bearing end cover 10, and the bearings are limited and sealed with the box bodies. The extending end of the input shaft 3 is sleeved with a transparent cover 11, the transparent cover 11 is installed on the outer side of the corresponding bearing hole, and two skeleton seals are installed between the transparent cover 11 and the input shaft to prevent leakage.

The output shaft 8 is a hollow shaft, and a pair of key grooves 12 are formed in an inner hole in the front end of the output shaft 8 and used for being connected with an extruder screw. The front end of the output shaft 8 is provided with a circle of limiting ring 13, and the rear end of the output shaft 8 is provided with external threads. The output shaft 8 is supported between the upper and lower cases 1,2 by three thrust bearings, the first and

second bearings

14,15 are supported by the cases, the third bearing support 16 is in an output chamber 17 projecting from the cases, and the output gear 8 is mounted between the first and

second bearings

14, 15. Install nut 18 on the rear end external screw thread of first bearing 14, nut 18 supports the outside of tight first bearing 14, it is spacing simultaneously through installing adjusting ring 20 between the inboard of first bearing 14 and the output gear 9 rear end to carry out the axial spacing with the box through lock washer 19 at the front end of first bearing 14, it is spacing through holding ring 21 between output gear 9 front end and second bearing 15, it is spacing through adjusting ring 22 and the shaft shoulder of output shaft between the front end of second bearing 15 and output chamber 17, the rear end face of third bearing 16 is spacing with the horizontal inner wall of output chamber 17, the front end of third bearing 16 is spacing by spacing ring 13 of output shaft 8. The nut 18 at the rear end of the output shaft 8 and the limit ring 13 at the front end of each component on the output shaft 8 are matched with a shaft shoulder, a stop washer 19, a positioning ring 21 and the like to realize axial front-back direction limit, so that the output shaft 8 can better bear axial thrust. An oil baffle plate 23 is arranged at the front end of the output shaft 8, two sealing rings are arranged between the oil baffle plate 23 and an output cavity for sealing, and a framework is arranged between the oil baffle plate and the output shaft for sealing; the rear end of the output shaft 8 is provided with a transparent cover 24, and a framework seal is also arranged between the transparent cover 24 and the output shaft.

In order to better lubricate and cool each bearing in the box body, so as to adapt to high-temperature working environment. A circle of oil groove 25 is processed at the top of the lower box body 2, the oil groove 25 penetrates through the installation chambers of the bearings, an oil thrower 26 is coaxially installed on the input shaft, and when the input shaft rotates, the oil thrower 26 throws lubricating oil onto the gears from the lower box body continuously and part of the oil enters the oil groove to lubricate the bearings.

Claims

1. The speed reducer for the plastic screw extruder comprises a box body, wherein the box body consists of an upper box body and a lower box body, an input shaft, an intermediate shaft and an output shaft are arranged between the upper box body and the lower box body, the intermediate shaft is driven by an input gear pair, the intermediate shaft is driven by an output gear pair, the output shaft is characterized in that the output shaft is a hollow shaft, an external thread is processed at one end of the output shaft, a limit ring is processed at the other end of the output shaft, the output shaft is supported on the box body by a first bearing, a second bearing and a third bearing, the first bearing and the second bearing are arranged on the side wall of the box body, the third bearing is arranged in an output cavity protruding out of the box body, the outer side of the first bearing is limited by a limit nut matched with the external thread, the inner side of the first bearing and a bearing of the output gear pair arranged on the output shaft are limited by a stop washer, the inner side, the outer side of the second bearing is limited by an adjusting ring with the third bearing, and the outer side of the third bearing is limited by a limiting ring of the output shaft.

2. The speed reducer for the plastic screw extruder according to claim 1, wherein an oil baffle plate is sleeved on the output end of the output shaft, the oil baffle plate is installed on the outer side of the limiting ring, a framework oil seal is installed between an inner hole of the oil baffle plate and the output shaft, and a sealing ring is installed between the outer portion of the oil baffle plate and the inner wall of the output cavity.

3. The reducer of claim 1, wherein the input shaft is coaxially provided with an oil slinger, and the top surface of the lower box body is provided with a ring of oil grooves which guide bearings corresponding to the input shaft, the intermediate shaft and the output shaft.

4. A reducer for plastic screw extruders according to claim 1 wherein the first, second and third bearings are thrust bearings.