Driving mechanism of bulking machine
By employing a labyrinth seal and combined seal design in the drive mechanism of the oil extruder, the problem of oil leakage in the bearing housing was solved, achieving closed-loop circulation of lubricating oil, ensuring equipment operational stability and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2026-03-24
AI Technical Summary
The main drive mechanism of the existing oil extruder has an oil leakage problem, especially at high temperature operation, the oil leakage at both ends of the bearing box is serious, which affects the hygiene and lubrication effect of the equipment, resulting in high maintenance costs and frequent bearing replacement.
An extruder drive mechanism was designed, which adopts a special oil-blocking structure and a small-hole oil return system, including a labyrinth seal and a combined seal, to ensure that there is no oil leakage at both ends of the bearing housing, and to achieve closed-loop circulation of lubricating oil through an automatic lubrication system.
It effectively prevents oil leakage from bearing housings under high-temperature operation, ensures equipment hygiene, extends equipment life, reduces maintenance time and costs, and improves equipment capacity and operational stability.
Smart Images
Figure CN224032966U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an oil material bulking machine, especially to a driving mechanism of bulking machine, belong to bulking equipment technical field. BACKGROUND
[0002] The bulking machine is widely applied in food processing and feed processing field, including bulking machine body, the bulking machine body is equipped with feeding cavity and extrusion cavity, the feeding cavity is connected in the one end of extrusion cavity, the front part of feeding cavity is equipped with feed inlet, and the feeding cavity and extrusion cavity are equipped with the screw rotor of head-to-tail connection, and the screw rotor is fixed on the bulking machine main shaft in turn, and the outer contour shape of screw rotor is adapted to the shape of the cavity respectively, and the outlet end of last-stage extrusion cavity is connected with the discharge die, and the discharge die is densely covered with a plurality of die holes. The material is extruded in the extrusion cavity by the screw, and the mechanical energy is converted into heat energy, and the material is gradually cooked, and the volume is rapidly expanded when extruding from the die hole of the discharge end, and the outside of the discharge die is provided with a cutter, and the extruded material is cut into particles.
[0003] At present, the main driving mechanism of oil bulking machine all exists large area oil leakage event, especially the both ends of the bearing box of specific bulking machine will leak oil, leading to not meet the hygiene, environmental requirement. One method is to add oil from the side of bearing, and the smoothness of the oil circuit in each bearing is poor, and an oil return port is arranged in the middle, so that the oil circuit of each bearing cannot be smooth, and ordinary end cover sealing is adopted, and the oil leakage at both ends is serious, and the bearing is replaced frequently.
[0004] Usually, the sealing place needs to be continuously oiled, so that the sealing ring is always in the oil film state, but oil still leaks outward, and the cost of adding food-grade lubricating oil is high.
[0005] In addition, oil leakage also brings poor bearing lubrication effect, bearing temperature rise, bearing damage, high maintenance cost, long maintenance time, high technical requirement and influence on the operation of customer production line. CONTENT OF THE UTILITY MODEL
[0006] This part aims to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplification or omission may be made in this part and the abstract of the specification and the utility model name, and such simplification or omission cannot be used to limit the scope of the utility model.
[0007] In view of the above and / or problems existing in the prior art, the utility model is proposed.
[0008] The utility model aims at overcoming the oil leakage problem that most troubles customers, providing a driving mechanism of bulking machine, ensuring that the both ends of bearing box do not leak oil and the lubricating oil does not contact with the material under high temperature operation, prolonging the service life of bearing, greatly reducing the maintenance time and cost.
[0009] The utility model discloses a driving mechanism of bulking machine, including bearing box, is equipped with main drive shaft along bearing box axis, the outer periphery of main drive shaft is successively equipped with oil baffle, first spacer sleeve, first bearing, second spacer sleeve, second bearing, third spacer sleeve and third bearing from left to right, and the inner ring right side of third bearing bears on the main drive shaft convex ring of main drive shaft right end, and the left side of oil baffle bears locking nut, and locking nut is screwed on the outer thread of main drive shaft, the left end of left oil return end cover of bearing box covers the labyrinth end cover, the left end of left oil return end cover covers the labyrinth end cover, the left side of locking nut is equipped with oil return ring, and the position of oil return ring opposite is equipped with left oil return cavity in the inner wall of the center hole of left oil return end cover, and the bottom of left oil return cavity is connected with the lower oil return cavity of left oil return end cover through small hole, and left oil return end cover communicates with the lower oil return cavity of bearing box, the middle segment bottom of bearing box is equipped with oil collecting tank, and the bottom of bearing box communicates with oil collecting tank through a plurality of oil discharge holes, the right side of third bearing is equipped with right end cover, and the right side flange of right end cover is fixed on the inner step of bearing box, and the left end surface of right end cover is equipped with annular right oil return cavity, and the bottom of right oil return cavity is equipped with radial small hole and communicates with the oil discharge hole of bearing box, and the center hole of right end cover is embedded with combined seal and the outer periphery sealing of main drive shaft convex ring, and the top of bearing box is equipped with three oil inlet joints, and is corresponding with the top center of first bearing, second bearing and third bearing respectively.
[0010] As the improvement of the utility model, the bottom of the oil collecting tank is provided with a main oil outlet, the main oil outlet is connected with the oil return port of the automatic lubricating system through an oil outlet pipe, the oil outlet of the automatic lubricating system is connected with the main oil inlet, and the main oil inlet is connected with the three oil inlet joints through an external oil pipe.
[0011] As the further improvement of the utility model, the labyrinth end cover is connected with the oil return ring through a connecting screw, and a labyrinth seal is formed between the right end surface of the labyrinth end cover and the left end port of the left oil return end cover.
[0012] As the further improvement of the utility model, the right end surface of the labyrinth end cover is provided with a labyrinth end cover center flange, the labyrinth end cover center flange is embedded in the port of the left oil return end cover and embedded with a labyrinth end cover sealing ring.
[0013] As the further improvement of the utility model, the combined seal comprises two skeleton oil seals arranged back to back, and the lips of the two skeleton oil seals abut against the outer periphery of the main drive shaft.
[0014] As the further improvement of the utility model, the first bearing and the third bearing are double-row cylindrical roller bearings, and the second bearing is a tapered roller thrust bearing.
[0015] Compared with the prior art, the utility model has at least the following advantages or beneficial effects:
[0016] 1. The special oil blocking structure, small oil return system, in high temperature operation, ensure that the bearing box both ends do not leak oil, ensure the health of the environment and the expansion of the material is not contaminated by lubricating oil;
[0017] 2. The oil circuit design is more smooth, lubrication is timely, greatly prolongs the service life and operation stability of the equipment, increases the maintenance interval time by several times, greatly improves the equipment capacity, shortens the replacement part time, reduces the maintenance cost, and reduces the work load of the maintenance personnel and the part cost. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings. The drawings are provided for reference and illustration only, and are not intended to limit the present application. Among them:
[0019] Figure 1 It is the front view of the driving mechanism of the expansion machine of the present application;
[0020] Figure 2 It is the left view of the driving mechanism of the expansion machine of the present application;
[0021] In the figure: 1. Main oil inlet; 2. Main oil outlet; 3. Automatic lubrication system; 4. Oil collecting tank; 5. Bearing box; 6. End cap plug; 7. Left oil return end cover; 8. Oil return ring; 9. Labyrinth end cover; 10. Connecting screw; 11. Main drive shaft; 12. Labyrinth end cover sealing ring; 13. Lock nut; 14. Oil baffle; 15. First spacer sleeve; 16. First bearing; 17. Oil inlet connector; 18. Second spacer sleeve; 19. Second bearing; 20. Third spacer sleeve; 21. Third bearing; 22. Right end cover; 23. Combined seal. DETAILED DESCRIPTION
[0022] In the following description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not mean that the device must have a particular orientation.
[0023] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the following will further describe the present application with specific drawings. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.
[0025] As shown in Figure 1 , Figure 2 The driving mechanism of the bulking machine comprises a bearing box 5, a left oil return end cover 7, a main drive shaft 11, a first bearing 16, a second bearing 19, a third bearing 21 and a right end cover 22. The main drive shaft 11 passes through the bearing box 5, the left end of the main drive shaft 11 is driven by a motor pulley, and the right end of the main drive shaft 11 is connected with a screw rod. The outer periphery of the main drive shaft 11 close to the right end is provided with a main drive shaft protruding ring, and the axial diameters of the main drive shaft protruding ring to the left and to the right are sequentially reduced.
[0026] The inner ring of the third bearing 21 abuts against the left side of the main drive shaft protruding ring, the inner ring left side of the third bearing 21 abuts against a third spacer sleeve 20, and the inner ring of the second bearing 19 abuts against the left side of the third spacer sleeve 20; the inner ring left side of the second bearing 19 abuts against a second spacer sleeve 18, and the inner ring of the first bearing 16 abuts against the left side of the second spacer sleeve 18.
[0027] The inner ring left side of the first bearing 16 abuts against a first spacer sleeve 15, the left side of the first spacer sleeve 15 abuts against an oil baffle 14, the left side of the oil baffle 14 abuts against a locking nut 13, and the locking nut 13 is screwed on the threaded section of the left end of the main drive shaft 11 to realize the axial positioning of the components.
[0028] The first bearing 16 and the third bearing 21 are double-row cylindrical roller bearings, mainly bearing radial force; the second bearing 19 is a tapered roller thrust bearing, bearing the reaction force of the extrusion of the screw rod.
[0029] The upper part of the bearing box 5 is provided with oil injection ports corresponding to the positions of the first bearing 16, the second bearing 19 and the third bearing 21, and the upper ends of the oil injection ports are respectively connected with oil inlet joints 17.
[0030] The left end of the bearing box 5 is covered with the left oil return end cover 7, and the left end face of the bearing box 5 is embedded with a sealing ring to realize end face sealing with the left oil return end cover 7; the right end of the left oil return end cover 7 is provided with an outer convex stopper, which is embedded in the left end port of the bearing box 5, thereby realizing center positioning and improving sealing performance.
[0031] The oil return ring 8, the locking nut 13, the oil baffle 14 and the first spacer 15 are located in the inner cavity of the left oil return end cover 7, that is, the left oil return end cover 7 is sleeved on the outer periphery of the oil return ring 8, the locking nut 13, the oil baffle 14 and the first spacer 15, and the left port of the left oil return end cover 7 is covered with the labyrinth end cover 9. The middle section of the outer peripheral wall of the oil return ring 8 is provided with an oil return ring outer ring groove, the inner wall of the left oil return end cover 7 is provided with a left oil return cavity which is annularly recessed, the left oil return cavity is opposite to the oil return ring outer ring groove in position, and the lower part of the left oil return end cover 7 is provided with a lower oil return cavity, and the bottom of the left oil return cavity is connected with the lower oil return cavity of the left oil return end cover 7 through a small hole downward.
[0032] The oil collecting tank 4 is welded below the middle section of the bearing box 5, the lower oil return cavity of the left oil return end cover 7 is communicated with the lower oil return cavity of the bearing box 5, and the bottom of the bearing box 5 is provided with three oil discharge holes communicated with the oil collecting tank 4; the first oil discharge hole is located at the left side of the second bearing 19, serving as an oil discharge passage of the lower oil return cavity of the left oil return end cover 7 and the bearing box 5; the second oil discharge hole is located between the second bearing 19 and the third bearing 21, and the third oil discharge hole is located at the right side of the third bearing 21 and is connected with the oil discharge hole of the right end cover 22.
[0033] The left end bottom of the lower oil return cavity of the left oil return end cover 7 is further provided with a discharge hole, and the end cover plug 6 is screwed in the discharge hole, which is used for discharge during maintenance or oil change.
[0034] The bottom of the oil collecting tank 4 is provided with a main oil outlet 2 connected with the oil return port of the automatic lubricating system 3 through an oil outlet pipe; the main oil inlet 1 is fixed to the lower part of the bearing box 5, and the outlet of the main oil inlet 1 is connected with the three oil inlet joints 17 at the top of the bearing box 5 through an externally arranged oil injection pipe.
[0035] The right side of the third bearing 21 is provided with the right end cover 22, the left end face of the right end cover 22 is provided with a right oil return cavity which is annularly recessed in the middle section of the circumference, the bottom of the right oil return cavity is provided with a radial small hole communicated with the oil discharge hole of the bearing box 5, the lower end of the oil discharge hole of the bearing box 5 is connected with an oil outlet joint and is connected with the bottom oil collecting cavity of the oil collecting tank 4 through a transition oil pipe. The left end face of the right end cover 22 is abutted on the outer ring of the third bearing 21, the right side flange of the right end cover 22 is abutted on the inner step of the bearing box 5, the outer peripheral wall of the right end cover 22 is embedded with a sealing ring to realize sealing with the inner wall of the bearing box 5, and the center hole of the right end cover 22 is installed with a combined seal 23 to realize sealing between the combined seal 23 and the convex ring of the main drive shaft, and the combined seal 23 adopts two skeleton oil seals back to back, and the lip of the skeleton oil seal is abutted on the outer periphery of the convex ring of the main drive shaft.
[0036] Oil circuit: the lubricating oil sent out by the automatic lubricating system 3 is distributed to the three oil inlet joints 17 above the bearing box 5 through the main oil inlet 1 and the externally arranged oil pipe.
[0037] The oil passage of the first bearing 16 is as follows: the lubricating oil enters the middle top oil port of the first bearing 16 from the first upper oil inlet joint 17, flows through the rolling elements, and then flows out to the left and right sides of the first bearing 16. The left side oil outlet is divided into two paths. The first oil passage is the A oil passage of the first bearing 16: the lubricating oil flows outward from the first spacer sleeve 15, passes through the oil baffle 14 to reduce the flow of lubricating oil to the left, then passes through the lock nut 13, enters the oil return ring 8, flows into the lower oil return cavity of the left oil return end cover 7 through the left oil return cavity enclosed by the oil return ring 8 and the left oil return end cover 7, and then flows into the lower oil return cavity of the left oil return end cover 7. The lowest part of the left oil return end cover 7 is provided with an end cover plug 6 which can be removed for cleaning.
[0038] The oil return ring 8 and the labyrinth end cover 9 are connected together by the connecting screw 10. The center of the right end face of the labyrinth end cover 9 is provided with a labyrinth end cover center flange which is embedded in the port of the left oil return end cover 7. The outer periphery of the labyrinth end cover center flange is embedded with a labyrinth end cover sealing ring 12 to ensure sealing. The right end face of the labyrinth end cover 9 is also provided with a labyrinth which is embedded in the left oil return end cover 7.
[0039] The second oil passage is the B oil passage of the first bearing 16: the lubricating oil flows into the lower oil return cavity of the left oil return end cover 7 through the hole on the right lower side of the left oil return end cover 7, flows into the lower oil return cavity of the bearing box 5 from the right side of the lower oil return cavity of the left oil return end cover, and then flows into the bottom oil collection cavity of the oil collection box 4 through the small hole at the right end bottom of the bearing box 5.
[0040] The third oil passage is the C oil passage of the first bearing 16: the lubricating oil flows out from the right port of the first bearing 16, enters the lower oil return cavity of the bearing box 5 through the right end gap of the bearing box 5, and then flows into the bottom oil collection cavity of the oil collection box 4 through the small hole at the bottom of the bearing box 5.
[0041] The oil passage of the second bearing 19 is as follows: the lubricating oil enters the middle top oil port of the second bearing 19 from the second upper oil inlet joint 17, flows through the upper rolling elements, and then is divided into two paths. The fourth oil passage is the D oil passage of the second bearing 19: the lubricating oil flows out from the left port of the second bearing 19, enters the outer peripheral space of the second spacer sleeve 18, then enters the lower oil return cavity of the bearing box 5 through the right end gap of the bearing box 5, and then flows into the bottom oil collection cavity of the oil collection box 4 through the small hole at the right end bottom of the bearing box 5.
[0042] The fifth oil passage is the E oil passage of the second bearing 19: the lubricating oil flows out from the lower rolling elements of the second bearing 19, then flows into the bottom oil collection cavity of the oil collection box 4 through the small hole at the bottom of the bearing box 5.
[0043] The oil passage of the third bearing 21 is as follows: the lubricating oil enters the middle top oil port of the third bearing 21 from the third upper oil inlet joint 17, flows through the upper rolling elements, and then is divided into two paths. The sixth oil passage is the F oil passage of the third bearing 21: the lubricating oil flows out from the left port of the third bearing 21, enters the outer peripheral space of the third spacer sleeve 20, and then flows into the bottom oil collection cavity of the oil collection box 4 through the small hole at the bottom of the bearing box 5.
[0044] The sixth oil path is the G oil path of the third bearing 21: flowing out from the right port of the third bearing 21, entering the right oil return cavity on the left end surface of the right end cover 22, and then flowing out from the bottom oil outlet of the right oil return cavity and connecting to the bottom oil collection cavity of the oil collection tank 4 through the transition oil pipe.
[0045] After the oil in the oil collection tank 4 flows out from the main oil outlet 2, it enters the automatic lubrication system 3 to complete the closed cycle.
[0046] The diameter of the circumference where the right oil return cavity is located is greater than the diameter of the circumference where the left oil return cavity is located, and the lubricating oil level in the entire bearing box is lower than the lower edge of the first bearing 16.
[0047] The above only describes the preferred embodiments of the present application, shows and describes the basic principles, main features and advantages of the present application, and is not intended to limit the patent protection scope of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments. In addition to the above embodiments, the present application can have other implementation manners without departing from the spirit and scope of the present application. The present application can also have various changes and improvements, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present application. The protection scope of the present application is defined by the appended claims and their equivalents. The technical features not described in the present application can be realized by or using existing technology, and will not be described here.
Claims
1. A drive mechanism for an extruder, comprising a bearing housing (5) and a main drive shaft (11) arranged along the axis of the bearing housing (5), characterized in that: The outer periphery of the main drive shaft (11) is fitted with an oil baffle (14), a first spacer (15), a first bearing (16), a second spacer (18), a second bearing (19), a third spacer (20), and a third bearing (21) in sequence from left to right. The right side of the inner ring of the third bearing (21) abuts against the main drive shaft convex ring at the right end of the main drive shaft (11). The left side of the oil baffle (14) abuts against a locking nut (13), which is screwed onto the external thread of the main drive shaft (11). The left port of the bearing housing (5) is covered with a left return oil end cap (7), and the left port of the left return oil end cap (7) is covered with a labyrinth end cap (9). The locking nut (13) has an oil return ring (8) on its left side. The left oil return end cap (7) has a left oil return cavity at a position opposite to the oil return ring (8) on the inner wall of the center hole. The bottom of the left oil return cavity is connected to the lower oil return cavity of the left oil return end cap (7) through a small hole. The left oil return end cap (7) is connected to the lower oil return cavity of the bearing box (5). The bottom of the middle section of the bearing housing (5) is provided with an oil collection tank (4), and the bottom of the bearing housing (5) is connected to the oil collection tank (4) through multiple oil drain holes; The right side of the third bearing (21) is provided with a right end cover (22). The right flange of the right end cover (22) is fixed on the inner step of the bearing housing (5). The left end face of the right end cover (22) is provided with an annular right oil return cavity. The bottom of the right oil return cavity is provided with a radial small hole that communicates with the oil drain hole of the bearing housing (5). The center hole of the right end cover (22) is embedded with a combined seal (23) and the outer circumferential seal of the main drive shaft ring. The bearing housing (5) is provided with three oil inlet connectors (17) on the top, which correspond to the top center of the first bearing (16), the second bearing (19) and the third bearing (21) respectively.
2. The driving mechanism of the extruder according to claim 1, characterized in that: The bottom of the oil collection tank (4) is provided with a main oil outlet (2), which is connected to the return oil port of the automatic lubrication system (3) through an oil outlet pipe; the oil outlet of the automatic lubrication system (3) is connected to the main oil inlet (1), which is connected to the three oil inlet connectors (17) through an external oil pipe.
3. The driving mechanism of the extruder according to claim 1, characterized in that: The labyrinth end cap (9) is connected to the oil return ring (8) by connecting screws (10), and a labyrinth seal is formed between the right end face of the labyrinth end cap (9) and the left port of the left oil return end cap (7).
4. The driving mechanism of the extruder according to claim 1, characterized in that: The labyrinth end cap (9) has a labyrinth end cap center flange at the center of its right end face. The labyrinth end cap center flange is embedded in the port of the left return oil end cap (7) and is fitted with a labyrinth end cap sealing ring (12).
5. The driving mechanism of the extruder according to claim 1, characterized in that: The combined seal (23) includes two skeleton oil seals arranged back to back, with the lips of the two skeleton oil seals abutting against the outer periphery of the main drive shaft (11).
6. The driving mechanism of the extruder according to claim 1, characterized in that: The first bearing (16) and the third bearing (21) are double-row cylindrical roller bearings, and the second bearing (19) is a tapered roller thrust bearing.