Multi-input screw conveyor center driving speed reducer

Abstract

The invention relates to the technical field of speed reducers, in particular to a multi-input screw conveyor center drive speed reducer. Comprising an input assembly, a front machine body, a gasket II, an end cover, a spline shaft, a large gear, a first-stage sun gear, a first-stage planet gear, a first-stage gear ring, a first-stage planet gear shaft, a first-stage planet carrier, a middle machine body, a second-stage sun gear, a second-stage planet gear, a second-stage gear ring, a second-stage planet gear shaft, a second-stage planet carrier, a transparent cover II, a shaft sleeve II and a rear machine body. By arranging a multi-input transmission system, the problems that a large shield spiral conveyor is insufficient in bearing capacity, limited in installation space and the like can be effectively solved, meanwhile, better compatibility is achieved, more types of main machines can be compatible, and under the condition of the same bearing capacity, the requirement for the capacity of a single motor is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of reducers, and in particular to a center-driven reducer for a multi-input screw machine. Background Art

[0002] The screw conveyor is an important component of the shield machine. It is usually installed at the tail of the shield machine. Through the rotation of the spiral blades and cooperation with the casing, the crushed stone, slag and mud excavated by the cutter head at the front end of the shield machine are pushed out from the soil bin to achieve the slag discharge function.

[0003] The tail of the screw conveyor is usually equipped with a central drive reducer or multiple peripheral drive reducers to drive the spiral blades to rotate. With the development of shield technology, the excavation diameter of the shield machine continues to increase, which puts higher and higher requirements on the slag discharge capacity of the screw conveyor, and also puts higher requirements on the load-bearing capacity of the screw conveyor reducer.

[0004] Due to the limitation of installation space, it is impossible to install multiple peripheral reducers to drive the spiral blades to rotate, and the use of a single motor or electric motor to drive the central reducer cannot meet the slag discharge capacity requirements of large shield machines. Therefore, there is an urgent need for a central drive reducer that can install multiple motors or electric motors at the same time to increase its load-bearing capacity. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a multi-input screw machine center drive reducer, which effectively solves the problems of insufficient load-bearing capacity and limited installation space of large shield screw conveyors by configuring a multi-input transmission system.

[0006] The technical solution adopted by the present invention is as follows: The invention provides a multi-input screw machine center drive reducer, comprising an input assembly, a front body, a gasket II, an end cover, a spline shaft, a large gear, a primary sun gear, a primary planetary gear, a primary ring gear, a primary planetary gear shaft, a primary planetary carrier, a middle body, a secondary sun gear, a secondary planetary gear, a secondary ring gear, a secondary planetary gear shaft, a secondary planetary carrier, a transparent cover II, a shaft sleeve II and a rear body; The front body, the primary gear ring, the middle body, the secondary gear ring and the rear body are coaxially fixedly connected in sequence; The input components are provided in three groups, which are evenly distributed around the circumference and connected to the front side of the front body; The spline shaft is coaxially arranged at the front side of the front body; the large gear is installed on the outside of the spline shaft through key coaxial interference fit; the front side of the spline shaft is connected to the front body through gasket II, bearing and bearing seat in sequence; the end cover is arranged at the front end of the spline shaft and connected to the front body through bolts; the three sets of input components are all meshed with the large gear; The primary sun gear is coaxially arranged inside the primary gear ring, and the front end is connected to the spline shaft through a spline; the primary planet carrier is coaxially arranged outside the primary sun gear, and a bearing is installed between the rear end of the primary sun gear and the primary planet carrier; the primary planet gear is correspondingly arranged outside the primary sun gear, and is meshed with the primary sun gear and the primary gear ring at the same time; the primary planet gear is installed on the primary planet carrier through a bearing and a primary planet gear shaft; The secondary sun gear is coaxially arranged on the rear side of the primary planetary carrier and its front end is connected to the primary planetary carrier through a spline; the secondary planetary gear is correspondingly arranged on the outside of the secondary sun gear, and is meshed with the secondary sun gear and the secondary ring gear at the same time; the secondary planetary carrier is coaxially arranged on the outside of the secondary sun gear, and a bearing is installed between the rear end of the secondary sun gear and the secondary planetary carrier; the secondary planetary gear is installed on the secondary planetary carrier through a bearing and a secondary planetary gear shaft; the rear end of the secondary planetary carrier extends to the outside of the rear body, and its front side is connected to the middle body through a bearing, and the rear side is connected to the rear body through a bearing; the transparent cover II is coaxially installed on the outer end of the rear body through screws; a shaft sleeve II is interference-installed between the transparent cover II and the secondary planetary carrier; a spline is arranged on the inner side of one end of the secondary planetary carrier located on the outside of the rear body.

[0007] Furthermore, the input component includes a gear shaft, a mounting flange, a sleeve I, a transparent cover I, a spacer ring I, a pressure plate, a spacer ring II, a gasket I and a locking nut; a mounting hole is opened at a corresponding position on the front end surface of the front body; the mounting flange is correspondingly mounted in the mounting hole of the front body by screws; the gear shaft is coaxially arranged in the mounting flange, the inner end of which extends inwardly to the interior of the front body, and a spline is arranged on the inner side of the outer end; the gear shaft is correspondingly meshed with the large gear; the sleeve I is interference-mounted on the gear shaft; the transparent cover I is coaxially screwed inside the mounting flange; a skeleton oil seal is installed between the transparent cover I and the sleeve I for sealing; two conical bearings are coaxially installed between the front part of the gear shaft and the front body, and a gasket I and a locking nut are installed on the gear shaft at the same time for positioning; a spacer ring II is installed between the two conical bearings; a spacer ring I is installed between the transparent cover I and the conical bearing to fix the bearing; the rear side of the gear shaft is connected to the front body through a bearing and a bearing seat, and the inner ring of the bearing is positioned by installing a pressure plate at the rear end of the gear shaft.

[0008] Furthermore, a lubrication and cooling system is provided on one side of the front body, and the lubrication and cooling system is respectively connected to three groups of input components and the interior of the front body through four oil pipes; an oil outlet of the lubrication and cooling system is provided on one side of the middle body.

[0009] Furthermore, a breathable cap is provided on one side of the middle body.

[0010] Furthermore, an oil temperature sensor is installed on one side of the front end surface of the front body.

[0011] Furthermore, a bearing temperature sensor is installed on the outside of the front body close to the inner conical bearing of each input assembly.

[0012] Furthermore, a rotation speed monitoring system is installed between the gear shaft and the mounting flange.

[0013] Furthermore, a viewing hole cover is provided on the side wall of the front body.

[0014] Furthermore, an oil filling port screw plug is arranged on the side wall of the front body; and an oil drain port screw plug is arranged on both sides of the surface of the rear body.

[0015] Furthermore, a liquid level tube is installed on one side of the front body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a structure of three input components, which can be installed with one, two or three motors respectively, so that the reducer can be compatible with more hosts without changing the installation interface; while the existing reducer has only one input and poor compatibility.

[0017] 2. The present invention adopts a structural form of three input components, has a strong bearing capacity, and is particularly suitable for large shield machines.

[0018] 3. The present invention adopts the form of multiple motors driving the reducer, which can reduce the requirements on the motor capacity under the same load-bearing capacity.

[0019] 4. The present invention has a compact structure and small dimensions, which can meet the requirements of limited installation space for shield machines.

[0020] 5. The present invention is equipped with a speed monitoring system to monitor the input speed of the reducer.

[0021] 6. The present invention is equipped with a lubrication and cooling system, which can ensure the speed reducer to operate continuously and stably at high speed for a long time.

[0022] 7. The present invention performs dynamic balancing on the gear shaft, thereby improving the stability of the reducer when running at high speed and reducing the vibration and noise of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the rear structure; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 for Figure 3 Schematic diagram of the local enlarged structure in; Figure 5It is a partial cross-sectional structural schematic diagram of the present invention; Figure 6 It is a side view structural schematic diagram of the present invention; Figure 7 for Figure 3 Schematic diagram of the local enlarged structure in.

[0024] Among them, the figure marks are: 1-gear shaft, 2-speed monitoring system, 3-mounting flange, 4-sleeve I, 5-transparent cover I, 6-spacer ring I, 7-oil filling port plug, 8-bearing seat, 9-front body, 10-pressure plate, 11-spacer ring II, 12-washer I, 13-locking nut, 14-oil temperature sensor, 15-washer II, 16-end cover, 17-spline shaft, 18-large gear, 19-bearing temperature sensor, 20-first-stage sun gear, 21-first-stage planetary gear, 22-first-stage ring gear, 23-first-stage Planetary gear shaft, 24-first-stage planetary carrier, 25-middle body, 26-breathing cap, 27-second-stage sun gear, 28-second-stage planetary gear, 29-second-stage ring gear, 30-second-stage planetary gear shaft, 31-second-stage planetary carrier, 32-transparent cover II, 33-shaft sleeve II, 34-oil drain plug, 35-rear body, 36-oil outlet of lubrication and cooling system, 37-oil inlet of lubrication and cooling system, 38-lubrication and cooling system, 39-liquid level tube, 40-sight hole cover, 41-oil pipe, 42-O-ring; 43-oil level. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0027] See attached Figure 1-7The present invention provides a multi-input screw machine center drive reducer, comprising three sets of input components, a front body (9), a gasket II (15), an end cover (16), a spline shaft (17), a large gear (18), a primary sun gear (20), a primary planetary gear (21), a primary ring gear (22), a primary planetary gear shaft (23), a primary planetary carrier (24), a middle body (25), a secondary sun gear (27), a secondary planetary gear (28), a secondary ring gear (29), a secondary planetary gear shaft (30), a secondary planetary carrier (31), a transparent cover II (32), a shaft sleeve II (33) and a rear body (35).

[0028] The front body (9), the first gear ring (22), the middle body (25), the second gear ring (29) and the rear body (35) are coaxially fixedly connected in sequence by screws; the three groups of input components are connected to the front side of the front body (9) in a circumferentially evenly distributed manner; The spline shaft (17) is coaxially arranged at the front side of the front body (9); the large gear (18) is installed on the outside of the spline shaft (17) through a key coaxial interference fit; the front side of the spline shaft (17) is connected to the front body (9) through a washer II (15), a bearing and a bearing seat in sequence, and a bearing is installed between the rear side and the front body (9); the end cover (16) is arranged at the front end of the spline shaft (17) and is connected to the front body (9) through bolts, and the clearance and positioning of the bearing at the front end of the spline shaft (17) and the washer II (15) can be adjusted through the end cover (16); the three sets of input components are all meshed with the large gear (18); The first-stage sun gear (20) is coaxially arranged inside the first-stage ring gear (22), and the front end is spline-connected to the rear end of the spline shaft (17); the first-stage planet carrier (24) is coaxially arranged outside the first-stage sun gear (20), and a bearing is installed between the rear end of the first-stage sun gear (20) and the first-stage planet carrier (24); a plurality of first-stage planet gears (21) are correspondingly arranged, evenly distributed outside the first-stage sun gear (20), and mesh with the first-stage sun gear (20) and the first-stage ring gear (22) at the same time; the first-stage planet gears (21) are installed on the first-stage planet carrier (24) via bearings and the first-stage planet gear shaft (23); The secondary sun gear (27) is coaxially arranged at the rear side of the primary planet carrier (24), and its front end is connected to the primary planet carrier (24) via a spline; a plurality of secondary planet gears (28) are correspondingly arranged, evenly distributed on the outside of the secondary sun gear (27), and mesh with the secondary sun gear (27) and the secondary gear ring (29); the secondary planet carrier (31) is coaxially arranged outside the secondary sun gear (27), and a bearing is installed between the rear end of the secondary sun gear (27) and the secondary planet carrier (31); the secondary planet gear (28) is installed on the secondary planet carrier (31) via a bearing and a secondary planet gear shaft (30); the secondary planet carrier (31) ) The rear end extends to the outside of the rear body (35), and the front side is connected to the middle body (25) through a bearing, and the rear side is connected to the rear body (35) through a bearing; the transparent cover II (32) is coaxially installed on the outer end of the rear body (35) through screws, and the bearing clearance can be adjusted and limited by the transparent cover II (32); a shaft sleeve II (33) is installed between the transparent cover II (32) and the secondary planetary frame (31) in an interference fit; two skeleton oil seals are installed back to back between the transparent cover II (32) and the shaft sleeve II (33); a spline is provided on the inner side of one end of the secondary planetary frame (31) located outside the rear body (35) for connecting the main engine accessories to output power. Bearings and gaskets are installed between each planetary gear and the planetary gear shaft, and each planetary gear shaft is fixed by a spring retaining ring.

[0029] In this embodiment, an O-type sealing ring (42) is arranged between each joint surface that needs to be sealed. An O-type sealing ring (42) is also arranged on the joint surface outside the screw of the rear body (35) and the secondary gear ring (29) to prevent the lubricating oil in the main engine lubrication cavity from leaking along the bolt hole.

[0030] When the present invention is installed, the axis is installed on the main machine with a certain angle tilted, and a transmission form of a primary parallel shaft + a secondary NGW planet is adopted. Three groups of input components are evenly arranged on the parallel shaft part. According to different usage requirements, all three input components can be connected, or only one or two of them can be connected.

[0031] The input assembly comprises a gear shaft (1), a mounting flange (3), a sleeve I (4), a cover I (5), a spacer ring I (6), a pressure plate (10), a spacer ring II (11), a washer I (12) and a locking nut (13); a mounting hole and a bolt hole are provided at corresponding positions on the front end surface of the front body (9); the mounting flange (3) is correspondingly mounted in the mounting hole of the front body (9) by screws; the gear shaft (1) is coaxially arranged in the mounting flange (3), the inner end of which extends inwardly into the interior of the front body (9), and a spline is provided on the inner side of the outer end, which is connected to the inner spline of the motor output shaft through the spline, and a threaded hole and a matching stop are processed on the mounting flange (3) for matching installation with the motor; the gear shaft (1) is correspondingly meshed with the large gear (18); the sleeve I (4) is interference-mounted on the gear shaft (1); the cover I (5) is The screws are coaxially engaged inside the mounting flange (3); a skeleton oil seal is installed between the transparent cover I (5) and the sleeve I (4) for sealing; two tapered bearings are coaxially installed between the front part of the gear shaft (1) and the front body (9), and a washer I (12) and a locking nut (13) and a stop washer are installed on the gear shaft (1) to position the bearings and prevent them from loosening; a spacer ring II (11) is installed between the two tapered bearings for adjusting the bearing clearance; a spacer ring I (6) is installed between the transparent cover I (5) and the tapered bearings to fix the bearings; the rear side of the gear shaft (1) is connected to the front body (9) through a bearing and a bearing seat (8), and the outer ring of the bearing is positioned by an elastic retaining ring, and the inner ring of the bearing is positioned by installing a pressure plate (10) at the rear end of the gear shaft (1), and the mounting pressure plate (10) is bolted to the rear end of the gear shaft (1), and the bolts can be prevented from loosening by passing a steel wire.

[0032] The maximum input speed of the reducer is 3000r / min. The gear shaft (1) can be dynamically balanced to improve the stability of the reducer when running at high speed and reduce the vibration and noise of the reducer.

[0033] A lubrication and cooling system (38) is provided on one side of the front body (9), and the lubrication and cooling system (38) is respectively connected to three groups of input components and the interior of the front body (9) through four oil pipes (41); an oil outlet (36) of the lubrication and cooling system is provided on one side of the middle body (25); an oil filling port screw plug (7) is provided on the side wall of the front body (9), and oil drain port screw plugs (34) are provided on both sides of the surface of the rear body (35) for filling and draining oil.

[0034] The cooled lubricating oil enters the lubricating and cooling system (38) through the lubricating and cooling system oil inlet (37), flows through four oil pipes to the interior of the reducer after being divided, and then flows through parts and holes with functions such as spraying, dividing, and overflowing, so that the lubricating oil reaches the position that needs lubrication and cooling, flows inside the reducer, and finally flows out of the reducer through the lubricating and cooling system oil outlet (36) and enters the external cooling device for cooling.

[0035] A liquid level tube (39) is installed on one side of the front body (9), and the oil level of the reducer is maintained near the center line of the liquid level tube (39). The components below the oil level are immersed in oil for lubrication, and the bearings, gears, and oil seals above the oil level are forcedly lubricated. The lubricating oil is directly sprayed on the above-mentioned components. In addition, the rotating components immersed in the lubricating oil will also stir and carry the lubricating oil during operation, thereby assisting the components above the oil level in lubricating.

[0036] The forced cooling of the reducer is achieved by controlling the temperature and flow rate of the lubricating oil entering the lubrication cooling system (38), and the surface of the reducer housing is assisted in heat dissipation through the temperature difference between the reducer and the external air.

[0037] In addition, in this embodiment, a breathable cap (26) is provided on one side of the middle body (25) for releasing the internal pressure of the reducer during operation; an oil temperature sensor (14) is installed on one side of the front end surface of the front body (9) for monitoring the internal oil temperature of the reducer; bearing temperature sensors (19) are installed on the outside of the front body (9) near the internal conical bearings of each input component to monitor the temperatures of the three conical bearings respectively; a speed monitoring system (2) is installed between the gear shaft (1) and the mounting flange (3) for monitoring the speed of the gear shaft (1); and a sight hole cover (40) is provided on the side wall of the front body (9) for inspecting and observing the meshing condition of the gears and the operation condition of the lubrication and cooling system (38).

[0038] When the reducer is running, power is transmitted to the gear shaft (1) by the motor or the electric motor through the spline and drives the gear shaft (1) to rotate. The gear shaft (1) and the large gear (18) are meshed through the gears, thereby driving the large gear (18) to rotate. The large gear (18) drives the spline shaft (17) to rotate through the key connection and the interference relationship, and drives the primary sun gear (20) to rotate through the spline connection between the spline shaft (17) and the primary sun gear (20). The primary sun gear (20) meshes with the primary planetary gear (21), and the primary planetary gear (21) meshes with the primary ring gear (22), thereby driving the primary planet carrier (24) to rotate. The primary planet carrier (24) drives the secondary sun gear (27) to rotate through the spline connection. The secondary sun gear (27) meshes with the secondary planetary gear (28), and the secondary planetary gear (28) meshes with the secondary ring gear (29), thereby driving the secondary planet carrier (31) to rotate, and finally outputs power through the splines outside the secondary planet carrier (31).

[0039] The present invention adopts a transmission form of a primary parallel shaft + a secondary NGW planetary gear system in series, and converts the power of the electric motor or motor by configuring gears with different numbers of teeth and making them mesh with each other, thereby achieving the purpose of reducing the rotation speed and increasing the torque.

[0040] Matters not described in detail in the present invention are known in the art.

[0041] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-input screw machine center drive reducer, characterized in that: The reducer comprises an input assembly, a front body, a gasket II, an end cover, a spline shaft, a large gear, a primary sun gear, a primary planetary gear, a primary ring gear, a primary planetary gear shaft, a primary planetary carrier, a middle body, a secondary sun gear, a secondary planetary gear, a secondary ring gear, a secondary planetary gear shaft, a secondary planetary carrier, a transparent cover II, a shaft sleeve II and a rear body; The front body, the primary gear ring, the middle body, the secondary gear ring and the rear body are coaxially fixedly connected in sequence; The input components are provided in three groups, which are evenly distributed around the circumference and connected to the front side of the front body; The spline shaft is coaxially arranged at the front side of the front body; the large gear is installed on the outside of the spline shaft through key coaxial interference fit; the front side of the spline shaft is connected to the front body through gasket II, bearing and bearing seat in sequence; the end cover is arranged at the front end of the spline shaft and connected to the front body through bolts; the three sets of input components are all meshed with the large gear; The primary sun gear is coaxially arranged inside the primary gear ring, and the front end is connected to the spline shaft through a spline; the primary planet carrier is coaxially arranged outside the primary sun gear, and a bearing is installed between the rear end of the primary sun gear and the primary planet carrier; the primary planet gear is correspondingly arranged outside the primary sun gear, and is meshed with the primary sun gear and the primary gear ring at the same time; the primary planet gear is installed on the primary planet carrier through a bearing and a primary planet gear shaft; The secondary sun gear is coaxially arranged on the rear side of the primary planetary carrier and its front end is connected to the primary planetary carrier through a spline; the secondary planetary gear is correspondingly arranged on the outside of the secondary sun gear, and is meshed with the secondary sun gear and the secondary ring gear at the same time; the secondary planetary carrier is coaxially arranged on the outside of the secondary sun gear, and a bearing is installed between the rear end of the secondary sun gear and the secondary planetary carrier; the secondary planetary gear is installed on the secondary planetary carrier through a bearing and a secondary planetary gear shaft; the rear end of the secondary planetary carrier extends to the outside of the rear body, and its front side is connected to the middle body through a bearing, and the rear side is connected to the rear body through a bearing; the transparent cover II is coaxially installed on the outer end of the rear body through screws; a shaft sleeve II is interference-installed between the transparent cover II and the secondary planetary carrier; a spline is arranged on the inner side of one end of the secondary planetary carrier located on the outside of the rear body.

2. A multi-input screw machine center drive reducer according to claim 1, characterized in that: The input assembly includes a gear shaft, a mounting flange, a sleeve I, a transparent cover I, a spacer ring I, a pressure plate, a spacer ring II, a gasket I and a locking nut; a mounting hole is opened at a corresponding position on the front end surface of the front body; the mounting flange is correspondingly mounted in the mounting hole of the front body by screws; the gear shaft is coaxially arranged in the mounting flange, and its inner end extends inwardly to the interior of the front body, and a spline is arranged on the inner side of the outer end; the gear shaft is correspondingly meshed with the large gear; the sleeve I is interference-mounted on the gear shaft; the transparent cover I is coaxially screwed inside the mounting flange; a skeleton oil seal is installed between the transparent cover I and the sleeve I for sealing; two conical bearings are coaxially installed between the front part of the gear shaft and the front body, and a gasket I and a locking nut are installed on the gear shaft at the same time for positioning; a spacer ring II is installed between the two conical bearings; a spacer ring I is installed between the transparent cover I and the conical bearing to fix the bearing; the rear side of the gear shaft is connected to the front body through a bearing and a bearing seat, and the inner ring of the bearing is positioned by installing a pressure plate at the rear end of the gear shaft.

3. A multi-input screw machine center drive reducer according to claim 1 or 2, characterized in that: A lubrication and cooling system is arranged on one side of the front body, and the lubrication and cooling system is respectively connected to three groups of input components and the interior of the front body through four oil pipes; an oil outlet of the lubrication and cooling system is arranged on one side of the middle body.

4. A multi-input screw machine center drive reducer according to claim 1 or 2, characterized in that: A ventilation cap is arranged on one side of the middle body.

5. The multi-input screw machine center drive reducer according to claim 3, characterized in that: An oil temperature sensor is installed on one side of the front end surface of the front body.

6. A multi-input screw machine center drive reducer according to claim 2, characterized in that: A bearing temperature sensor is installed outside the front body near the inner conical bearing of each input assembly.

7. The multi-input screw machine center drive reducer according to claim 2, characterized in that: A rotation speed monitoring system is installed between the gear shaft and the mounting flange.

8. The multi-input screw machine center drive reducer according to claim 3, characterized in that: A viewing hole cover is arranged on the side wall of the front body.

9. The multi-input screw machine center drive reducer according to claim 3, characterized in that: The side wall of the front body is provided with an oil filling port screw plug; and the two sides of the surface of the rear body are provided with oil drain port screw plugs.

10. The multi-input screw machine center drive reducer according to claim 3, characterized in that: A liquid level tube is installed on one side of the front body.

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