A sealing device for preventing oil leakage from a gear box of an extruder

Abstract

The utility model discloses a kind of sealing oil leakage prevention devices for extruder gear box, belong to extruder gear box sealing field.A kind of sealing oil leakage prevention devices for extruder gear box, including gear box, gear box includes lower box and upper box, the top of lower box is provided with clamping groove, the bottom of upper box is installed with clamping plate at corresponding place of clamping groove, sealing ring is equipped at the connecting place of gear box with gear shaft, the inside of lower box is equipped with oil return mechanism, oil return mechanism includes pump oil component installed in the bottom of lower box and sleeve installed on the gear shaft inside lower box, sleeve is located at the side of pump oil component, first pressure rod is installed on the outside of sleeve;The utility model is equipped with sealing ring and clamping groove being set in the top of lower box and clamping plate being installed in the bottom of upper box, effectively improve the sealing oil leakage prevention effect of gear box, meanwhile, form partition by clamping plate and clamping groove, prevent sealant from entering into lower box.

Description

Technical Field

[0001] This utility model relates to the field of extruder gearbox sealing technology, and in particular to a sealing and oil-leakage prevention device for extruder gearboxes. Background Technology

[0002] The core function of extruder gearbox seals to prevent oil leakage is to maintain the stability of the internal lubrication system of the gearbox by effectively preventing lubricating oil leakage and the intrusion of external contaminants. This avoids abnormal wear of gears and bearings, equipment overheating, and even mechanical failures caused by insufficient lubrication. At the same time, it reduces environmental pollution and production safety hazards caused by oil leakage, and significantly reduces equipment maintenance costs and production downtime risks by extending the service life of key gearbox components.

[0003] A search revealed Chinese patent application number 202420875600.1, which discloses a gear reducer with an oil-leakage prevention structure. The reducer includes a lower housing, an input shaft within which a first gear is fixedly connected, and a lubrication structure. An output shaft within the lower housing is also included, with a second gear fixedly connected to it and meshing with the first gear. Both ends of the input and output shafts are rotatably connected to bushings. Sealing rings are fixedly connected to the outer periphery of each bushing, and a retaining sleeve is fixedly connected to the outer side of each sealing ring. The retaining sleeve is fixedly connected to the lower housing via hexagonal socket head cap screws, and a connecting sleeve is rotatably connected to the inner side of the retaining sleeve. This application, through the bushings, sealing rings, retaining sleeves, connecting sleeves, and sealing rings, achieves double sealing to prevent oil leakage at both ends of the input and output shafts of the gear reducer, solving the problem of easy oil leakage at the shaft ends of gear reducers in the prior art.

[0004] Although the aforementioned patent can achieve double sealing to prevent oil leakage at both ends of the input and output shafts of the gear reducer by setting bushings, sealing rings, ferrules, connecting sleeves and sealing rings, the sealing performance at the connection between the upper and lower housings of the gearbox is poor. To improve the sealing performance, sealant is applied to the connection, but during installation, the sealant is easily squeezed into the housing and may cause blockage of the oil drain hole inside the housing.

[0005] Therefore, there is an urgent need for sealing and leak-proof devices for extruder gearboxes to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to solve the problems of poor sealing between the upper and lower housings in the prior art, and the fact that the sealant is easily squeezed into the housing during installation, causing blockage of the oil drain hole and other parts of the housing. Therefore, this invention proposes a sealing and oil leakage prevention device for the gearbox of an extruder.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sealing and leak-proof device for an extruder gearbox includes a gearbox comprising a lower housing and an upper housing. A slot is provided on the top of the lower housing, and a retaining plate is installed on the bottom of the upper housing corresponding to the slot. A sealing ring is provided at the connection point between the gearbox and the gear shaft. An oil return mechanism is provided inside the lower housing, comprising an oil pump assembly installed at the bottom of the lower housing and a sleeve installed on the gear shaft inside the lower housing. The sleeve is located on one side of the oil pump assembly, and a first pressure rod is installed on the outer side of the sleeve. An arc-shaped pressure roller is provided at the outer end of the first pressure rod.

[0009] As a preferred technical solution of this application, the sealing ring includes a first sealing ring connected to the gearbox and a second sealing ring connected to the gear shaft. A first sealing gasket is installed on the inner side of the first sealing ring, and a second sealing gasket is connected to the inner side of the second sealing ring by a plurality of compression springs.

[0010] As a preferred technical solution of this application, the oil pump assembly includes an oil return cylinder, an oil return pipe and an oil outlet pipe are respectively installed on the bottom two sides of the oil return cylinder, and a second pressure rod is slidably installed inside the oil return cylinder, with a pressure plate installed on one end of the second pressure rod located inside the oil return cylinder.

[0011] As a preferred technical solution of this application, a one-way valve is provided at the connection between the oil return pipe and the oil outlet pipe and the oil return cylinder.

[0012] As a preferred technical solution of this application, a horizontal pipe is installed at the outer end of the oil outlet pipe, and multiple oil injection pipes are provided on the horizontal pipe.

[0013] As a preferred technical solution of this application, a sealing strip is installed on the outer side of the pressure plate.

[0014] As a preferred technical solution of this application, the top of the oil return cylinder is provided with a cylinder cover, and a top plate is installed on the top of the oil return cylinder, the top of the top plate being arc-shaped.

[0015] As a preferred technical solution of this application, a plurality of uprights are installed at the bottom of the top plate, the uprights slide within the wall of the oil return cylinder, and the bottom of the uprights is connected to the oil return cylinder by a spring.

[0016] Compared with the prior art, this utility model provides a sealing and oil-leakage prevention device for an extruder gearbox, which has the following beneficial effects:

[0017] 1. This sealing and oil leakage prevention device for extruder gearboxes, through the setting of a sealing ring, a slot opened on the top of the lower housing, and a plate installed on the bottom of the upper housing, can effectively improve the sealing performance at the connection between the gear shaft and the gearbox, as well as at the connection between the lower housing and the upper housing, thereby effectively improving the sealing and oil leakage prevention effect of the gearbox. At the same time, it can also form a partition to prevent sealant from entering the lower housing. This solves the problems of poor sealing performance between the upper and lower housings in the prior art, and the sealant being squeezed during installation and easily entering the housing, which can cause blockage of the oil drain hole and other parts of the housing.

[0018] 2. The sealing and oil leakage prevention device for the extruder gearbox, through the set oil return mechanism, can drive the first pressure rod to rotate and squeeze the top plate through the gear shaft inside the gearbox during use. The lubricating oil located at the bottom of the lower box is drawn out by the oil pump assembly and sprayed onto the gears and other parts to lubricate and cool them, thereby improving the utilization rate of the lubricating oil inside the lower box. Attached Figure Description

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

[0020] Figure 2 This is a schematic diagram of the internal structure of the gearbox of this utility model;

[0021] Figure 3 This is a schematic diagram of the oil return mechanism of this utility model;

[0022] Figure 4 This is an exploded view of the oil return mechanism of this utility model;

[0023] Figure 5 This is a schematic diagram of the sealing ring structure of this utility model.

[0024] In the picture:

[0025] 1. Lower housing; 2. Sealing ring; 201. First sealing ring; 202. First sealing gasket; 203. Second sealing gasket; 204. Second sealing ring; 205. Compression spring; 3. Upper housing; 4. Sleeve; 5. First pressure rod; 6. Oil return cylinder; 7. Oil return pipe; 8. Oil outlet pipe; 9. Horizontal pipe; 10. Oil injection pipe; 11. Vertical rod; 12. Top plate; 13. Second pressure rod; 14. Cylinder cover; 15. Spring; 16. Pressure plate; 17. Sealing strip; 18. Slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0027] Reference Figures 1-5 A sealing and oil-leakage prevention device for an extruder gearbox includes a gearbox, which comprises a lower housing 1 and an upper housing 3. The top of the lower housing 1 is provided with a slot 18, and the bottom of the upper housing 3 is provided with a retaining plate corresponding to the slot 18. The retaining plate fits into the slot 18, which facilitates positioning when the lower housing 1 and the upper housing 3 are installed, improves sealing, prevents lubricating oil leakage, and also forms a partition to prevent the adhesive applied at the connection between the lower housing 1 and the upper housing 3 from entering the interior of the lower housing 1.

[0028] A sealing ring 2 is provided at the connection between the gearbox and the gear shaft. The sealing ring 2 improves the sealing performance at the contact point between the gear shaft and the gearbox. The sealing ring 2 includes a first sealing ring 201 connected to the gearbox and a second sealing ring 204 connected to the gear shaft. A first sealing gasket 202 is installed on the inner side of the first sealing ring 201. A second sealing gasket 203 is connected to the inner side of the second sealing ring 204 through multiple compression springs 205. During use, the gear shaft drives the second sealing gasket 203 to rotate, and a liquid film seal is formed between the second sealing gasket 203 and the first sealing gasket 202. At the same time, the multiple compression springs 205 can compensate for the wear of the second sealing gasket 203, effectively improving the sealing effect.

[0029] Reference Figure 2 , Figure 3 and Figure 4 The lower housing 1 is equipped with an oil return mechanism. The lubricating oil located at the bottom of the lower housing 1 is drawn out through the oil return mechanism and sprayed onto gears and other parts to improve the lubrication effect.

[0030] The oil return mechanism includes an oil pump assembly installed at the bottom of the lower housing 1 and a sleeve 4 installed on the gear shaft inside the lower housing 1. The sleeve 4 is located on one side of the oil pump assembly. A first pressure rod 5 is installed on the outer side of the sleeve 4. An arc-shaped pressure roller is provided at the outer end of the first pressure rod 5. In use, the sleeve 4 is rotated by the gear shaft. The first pressure rod 5 presses the oil pump assembly, sucking out the lubricating oil located at the bottom of the inner side of the lower housing 1. The oil is then sprayed out by squeezing to lubricate and cool the gears and other components inside the gearbox.

[0031] The oil pump assembly includes an oil return cylinder 6. An oil return pipe 7 and an oil outlet pipe 8 are installed on both sides of the bottom of the oil return cylinder 6. One-way valves are installed at the connections of the oil return pipe 7 and the oil outlet pipe 8 to the oil return cylinder 6 to prevent lubricating oil from being discharged through the oil return pipe 7 or being drawn back into the oil outlet pipe 8 during the pumping process. A second pressure rod 13 is slidably installed inside the oil return cylinder 6. A pressure plate 16 is installed on one end of the second pressure rod 13 inside the oil return cylinder 6. The pressure plate 16 slides inside the oil return cylinder 6, drawing lubricating oil into the oil return cylinder 6 through the oil return pipe 7 and spraying it out through the oil outlet pipe 8. A horizontal pipe 9 is installed at the outer end of the oil outlet pipe 8, and multiple oil spray pipes 10 are provided on the horizontal pipe 9. A sealing strip 17 is installed on the outer side of the pressure plate 16, which effectively improves the sealing between the outer wall of the pressure plate 16 and the inner wall of the oil return cylinder 6.

[0032] The top of the oil return cylinder 6 is provided with a cylinder cover 14, and a top plate 12 is installed on the top of the oil return cylinder 6. The top of the top plate 12 is arc-shaped, which facilitates the compression of the top plate 12 by the first pressure rod 5, which drives the second pressure rod 13 to descend and spray the lubricating oil in the oil return cylinder 6 through the oil outlet pipe 8. Multiple uprights 11 are installed at the bottom of the top plate 12. The uprights 11 slide inside the wall of the oil return cylinder 6. At the same time, the bottom of the uprights 11 is connected to the oil return cylinder 6 through the spring 15. After the top plate 12 is no longer compressed by the first pressure rod 5, under the elastic force of the multiple springs 15, the second pressure rod 13 rises and draws the lubricating oil at the bottom of the lower housing 1 into the oil return cylinder 6 through the oil return pipe 7. This cycle continues, continuously spraying the lubricating oil located at the bottom of the inner side of the lower housing 1 onto the gears and other components.

[0033] Specifically, the sealing and leak-proof device for the extruder gearbox operates as follows: the gear shaft drives the sleeve 4 mounted on the gear shaft to rotate. The sleeve 4, with the first pressure rod 5 mounted on it, rotates to the bottom, causing the top plate 12 to be squeezed. This causes the top plate 12 to drive the second pressure rod 13 to descend. The pressure plate 16 at the bottom of the second pressure rod 13 slides along the inner wall of the return oil cylinder 6, squeezing the lubricating oil in the return oil cylinder 6. The lubricating oil is then sprayed onto the gears and other parts through the oil outlet pipe 8, the horizontal pipe 9 connected to the oil outlet pipe 8, and the oil spray pipe 10. After the first pressure rod 5 rotates out of the range of the top plate 12, it lifts the top plate 12 under the action of the spring 15, while simultaneously driving the second pressure rod 13 to rise and fall. The lubricating oil at the bottom of the lower housing 1 is drawn into the return oil cylinder 6 through the return oil pipe 7. This cycle repeats, allowing the lubricating oil located at the bottom of the inner side of the lower housing 1 to be sprayed back onto the gears and other parts.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing and leak-proof device for an extruder gearbox, comprising a gearbox, characterized in that, The gearbox includes a lower housing (1) and an upper housing (3). The top of the lower housing (1) is provided with a slot (18). The bottom of the upper housing (3) is provided with a card plate corresponding to the slot (18). A sealing ring (2) is provided at the connection between the gearbox and the gear shaft. The lower housing (1) is provided with an oil return mechanism. The oil return mechanism includes an oil pump assembly installed at the bottom of the lower housing (1) and a sleeve (4) installed on the gear shaft inside the lower housing (1). The sleeve (4) is located on one side of the oil pump assembly. A first pressure rod (5) is installed on the outer side of the sleeve (4). An arc-shaped pressure roller is provided at the outer end of the first pressure rod (5).

2. The sealing and oil leakage prevention device for an extruder gearbox according to claim 1, characterized in that, The sealing ring (2) includes a first sealing ring (201) connected to the gearbox and a second sealing ring (204) connected to the gear shaft. A first sealing gasket (202) is installed on the inner side of the first sealing ring (201), and a second sealing gasket (203) is connected to the inner side of the second sealing ring (204) by a plurality of compression springs (205).

3. A sealing and leak-proof device for an extruder gearbox according to claim 1, characterized in that, The oil pump assembly includes an oil return cylinder (6), with an oil return pipe (7) and an oil outlet pipe (8) installed on both sides of the bottom of the oil return cylinder (6). A second pressure rod (13) is slidably installed inside the oil return cylinder (6), and a pressure plate (16) is installed on one end of the second pressure rod (13) located inside the oil return cylinder (6).

4. A sealing and leak-proof device for an extruder gearbox according to claim 3, characterized in that, One-way valves are provided at the connection points of the return oil pipe (7) and the outlet oil pipe (8) with the return oil cylinder (6).

5. A sealing and leak-proof device for an extruder gearbox according to claim 3, characterized in that, The outer end of the oil outlet pipe (8) is equipped with a horizontal pipe (9), and the horizontal pipe (9) is provided with multiple oil injection pipes (10).

6. A sealing and leak-proof device for an extruder gearbox according to claim 3, characterized in that, A sealing strip (17) is installed on the outside of the pressure plate (16).

7. A sealing and leak-proof device for an extruder gearbox according to claim 3, characterized in that, The top of the oil return cylinder (6) is provided with a cylinder cover (14), and a top plate (12) is installed on the top of the oil return cylinder (6). The top of the top plate (12) is arc-shaped.

8. A sealing and leak-proof device for an extruder gearbox according to claim 7, characterized in that, The bottom of the top plate (12) is equipped with multiple uprights (11), which slide inside the wall of the return oil cylinder (6). The bottom of the uprights (11) is connected to the return oil cylinder (6) by a spring (15).

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