An oil supply device for the bearing housing of an extruder screw head

Abstract

This utility model relates to the technical field of extruder lubrication systems, and in particular to an oil supply device for the screw head bearing housing of an extruder. The oil supply device includes: a cylinder, multiple adaptable pipes, labyrinth seals symmetrically installed on the left side of the cylinder, a bearing installed at the end of the labyrinth seal furthest from the cylinder, an inlet filter connected to the bottom of the bearing via an adaptable pipe, a first oil pump installed via an adaptable pipe to the inlet filter, a first oil tank installed at the input end of the first oil pump, and a first heat exchanger installed at the output end of the first oil pump via an adaptable pipe. The oil supply device for the screw head bearing housing of this utility model allows for maintenance and repair of only this system if a problem occurs. This significantly reduces the time required to clean foreign objects from the oil system, greatly decreases the number of lubricating oil replacements, lowers operating costs, and extends the operating time of the extruder system.

Description

Technical Field

[0001] This utility model relates to the technical field of extruder lubrication systems, and in particular to an oil supply device for the screw head bearing housing of an extruder. Background Technology

[0002] The oil supply device for the extruder screw head bearing housing is a key auxiliary device that provides lubrication and cooling for the screw head bearing housing. Through core components such as oil pumps, oil pipes, and oil tanks, it stably delivers lubricating oil to the bearing contact areas, which can reduce friction and wear during bearing operation, extend service life, and remove the heat generated during operation, preventing bearing failure due to high temperature. Ultimately, it ensures the smooth, efficient, and continuous operation of the extruder screw.

[0003] Currently, most extruders typically employ a cantilever beam structure where the tail section is connected to the gearbox via a spline. The screw within the barrel is prone to wear against the barrel wall due to the cantilever effect. To address this issue, the CIM460PⅡ twin-screw, double-support L-type extruder developed by JSW Corporation of Japan avoids wear by increasing screw support points, but this design introduces additional leakage risks. In existing technology, the screw head bearing housing uses a labyrinth seal to prevent molten resin leakage. However, because the labyrinth seal works by achieving a non-complete seal through multi-stage throttling and pressure reduction, resin can still leak and enter the bearing housing through the oil seal. This causes high-temperature resin to accelerate oil seal aging and failure, and resin contaminates the lubricating oil, disrupting bearing lubrication conditions. Furthermore, the original centralized oil supply system connects the bearing housing to the main gearbox, allowing leaked resin to spread along the oil path to the main gearbox, damaging expensive special bearings. Repair costs are high and maintenance is time-consuming. Once localized contamination occurs, the entire system needs cleaning and oil change, resulting in significant maintenance workload and prolonged downtime.

[0004] Therefore, it is necessary to provide a new oil supply device for the extruder screw head bearing housing to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides an oil supply device for the bearing housing of the screw head of an extruder.

[0006] The oil supply device for the screw head bearing housing of an extruder provided by this utility model includes: a barrel, multiple adaptable pipes, labyrinth seals symmetrically installed on the left side of the barrel, a bearing installed at the end of the labyrinth seal away from the barrel, an inlet filter connected to the bottom of the bearing via an adaptable pipe, a first oil pump installed on the inlet filter via an adaptable pipe, a first oil tank installed at the input end of the bottom of the first oil pump, a first heat exchanger installed on the output end of the first oil pump via an adaptable pipe, an outlet filter installed on the top of the first heat exchanger via an adaptable pipe, and a pipe connecting the outlet filter to the bearing. A temperature sensor and a flow meter switch are installed separately. The flow meter switch is located above the temperature sensor. Screws are symmetrically installed inside the cylinder. A drive assembly is installed at the end of the cylinder away from the labyrinth seal. A second oil tank is installed below the end of the cylinder away from the labyrinth seal. A second oil pump is installed on the bottom right side of the second oil tank through a matching pipe. A second heat exchanger is installed at the output end of the second oil pump through a matching pipe. An independent filter is installed at the top of the second heat exchanger through a matching pipe. A pressure gauge and a temperature gauge are installed on the outside of the matching pipe between the independent filter and the second oil tank.

[0007] Preferably, the drive assembly includes a gearbox, one side of which is fixedly connected to the end of the cylinder away from the labyrinth seal, and a motor is installed at the input end of the gearbox.

[0008] Preferably, the top of the outlet filter is fixedly connected to the end of the bearing away from the labyrinth seal via a matching pipe, and this matching pipe has two connection points that are respectively installed with the two bearings.

[0009] Preferably, the end of the independent filter furthest from the second heat exchanger is fixedly connected to the bottom left side of the second oil tank via a suitable pipe.

[0010] Preferably, the pressure gauge is positioned below the temperature gauge.

[0011] Preferably, the output end of the gearbox is fixedly connected to one end of the screw.

[0012] Preferably, the bottom of the gearbox is fixedly connected to the top of the second oil tank.

[0013] Compared with related technologies, the oil supply device for the extruder screw head bearing housing provided by this utility model has the following advantages: This invention establishes a small-scale lubrication system, separate from the original unit's centralized oil supply system, and adopts an independent left and right side oil supply system. The left side is for the screw head bearing box, and the right side is for components such as the gearbox. In case of problems, only this system needs to be inspected and maintained. The time for cleaning foreign objects from the oil system is also greatly shortened, the number of lubricating oil replacements is also greatly reduced, the operating cost is reduced, and the extruder system's operating time is extended. The left-side oil supply system of this utility model ensures that the lubricating oil entering the bearings and gearboxes is clean and at a suitable temperature through multi-stage filtration by inlet filter, outlet filter, and independent filter, as well as cooling treatment by the first heat exchanger and the second heat exchanger. It can effectively form a stable oil film, reduce friction and wear, and remove heat in time to avoid component failure due to high temperature or impurities. The right-side oil supply system of this utility model is equipped with monitoring components such as temperature sensors, flow meter switches, pressure gauges, and thermometers, which can monitor parameters such as temperature, flow rate, and pressure of lubricating oil in real time. Once an abnormality occurs, it can promptly provide feedback and trigger the protection mechanism, making the device more stable and reliable in operation, reducing equipment failures caused by oil supply problems, and ensuring continuous and efficient production of the extruder. Attached Figure Description

[0014] Figure 1 A schematic diagram of the oil supply device for the extruder screw head bearing housing provided by this utility model.

[0015] The following are the labels in the diagram: 1. Cylinder; 2. Labyrinth seal; 3. Bearing; 4. Inlet filter; 5. First oil pump; 501. First oil tank; 6. First heat exchanger; 7. Outlet filter; 8. Temperature sensor; 9. Flow meter switch; 10. Screw; 11. Gearbox; 12. Second oil tank; 13. Motor; 14. Second oil pump; 15. Second heat exchanger; 16. Independent filter; 17. Pressure gauge; 18. Temperature gauge. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figure 1 An oil supply device for the bearing housing of an extruder screw head includes: a barrel 1 and multiple adaptable pipes. A labyrinth seal 2 is symmetrically installed on the left side of the barrel 1. The labyrinth seal 2 adopts a multi-stage slit design, which can effectively throttle and seal the molten resin. A bearing 3 is installed at the end of the labyrinth seal 2 away from the barrel 1. The bottom end of the bearing 3 is connected to an inlet filter 4 through an adaptable pipe to intercept impurity particles in the lubricating oil. The first oil pump 5 and the inlet filter 4 are connected by a matching pipeline. The first oil pump 5 provides a power source for the left oil circuit. The first oil tank 501 is installed at the input end of the bottom of the first oil pump 5 to store the lubricating oil circulating on the left side. The first heat exchanger 6 is installed at the output end of the first oil pump 5 through a matching pipe, which can perform efficient heat exchange with the lubricating oil. The top of the first heat exchanger 6 is installed at the top through a matching pipe, and the outlet filter 7 further filters the lubricating oil. The top of the outlet filter 7 is fixedly connected to the end of the bearing 3 away from the labyrinth seal 2 through a matching pipe. This matching pipe has two connection points and is installed at two bearings 3 respectively. The pipe connecting the outlet filter 7 and the bearing 3 is respectively installed with a temperature sensor 8 and a flow meter switch 9. The flow meter switch 9 is located above the temperature sensor 8. The temperature sensor 8 can monitor the lubricating oil temperature in real time, and the flow meter switch 9 can control and monitor the lubricating oil flow. Screws 10 are symmetrically installed inside the cylinder 1. The drive assembly is installed at the end of the cylinder 1 away from the labyrinth seal 2. The drive assembly includes a reduction gearbox 11. The reduction gearbox 11 achieves power reduction and torque amplification through gear transmission. The output end of the reduction gearbox 11 is fixedly connected to one end of the screw 10. One side of the reduction gearbox 11 is fixedly connected to the end of the cylinder 1 away from the labyrinth seal 2. The input end of the reduction gearbox 11 is equipped with a motor 13. The second oil tank 12 is used to store the lubricating oil circulating on the right side. The bottom end of the gearbox 11 is fixedly connected to the top end of the second oil tank 12. The second oil tank 12 is installed below the end of the cylinder 1 away from the labyrinth seal 2. The second oil pump 14 is installed on the right side of the bottom end of the second oil tank 12 through a matching pipe. The output end of the second oil pump 14 is installed on the second heat exchanger 15 through a matching pipe. The top end of the second heat exchanger 15 is installed on the independent filter 16 through a matching pipe. The end of the independent filter 16 away from the second heat exchanger 15 is fixedly connected to the left side of the bottom end of the second oil tank 12 through a matching pipe. A pressure gauge 17 and a temperature gauge 18 are installed on the outside of the matching pipe between the independent filter 16 and the second oil tank 12. The pressure gauge 17 is located below the temperature gauge 18. The pressure gauge 17 can monitor the lubricating oil pressure, and the temperature gauge 18 can monitor the lubricating oil temperature.

[0019] The working principle of the oil supply device for the extruder screw head bearing housing provided by this utility model is as follows: After the device is started, the first oil pump 5 begins to work, and its power causes lubricating oil to be drawn from the first oil tank 501 and enter the initial stage of the lubricating oil circulation, providing the source power for the operation of the entire left-side oil circuit. The lubricating oil drawn by the first oil pump 5 enters the first heat exchanger 6 under pressure. Inside the first heat exchanger 6, the lubricating oil exchanges heat fully with the preset cooling medium. Through the continuous heat transfer process, the temperature of the lubricating oil gradually decreases, thereby avoiding the impact of excessive oil temperature on the subsequent lubrication effect. After being cooled by the first heat exchanger 6... The lubricating oil continues to flow along the oil path and then enters the outlet filter 7. The internal filtration structure of the outlet filter 7 performs a thorough filtration of the lubricating oil, intercepting any tiny impurities and particles that may be present, ensuring that the lubricating oil entering the bearing 3 remains highly clean. After being filtered, the lubricating oil flows out of the outlet filter 7 and is directly delivered to the bearing 3. At this point, the lubricating oil fills all the gaps inside the bearing 3, forming a stable oil film during the operation of the bearing 3. This oil film effectively reduces the direct friction between the internal components of the bearing 3, and also... The lubricating oil absorbs and carries away the heat generated by friction during the operation of bearing 3, playing a dual role of lubrication and cooling. The lubricating oil that completes the lubrication and cooling tasks of bearing 3 flows out from inside bearing 3 and then enters inlet filter 4. Inlet filter 4 filters the lubricating oil that has circulated through bearing 3 again, removing wear debris, impurities, etc. that may have been mixed in during the lubrication process, further ensuring the cleanliness of the lubricating oil. The lubricating oil filtered by inlet filter 4 is then drawn by the first oil pump 5 again. Under the continuous drive of the first oil pump 5, it finally flows back to the first oil tank 501, thus completing the entire circulation process of the left lubricating oil circuit. In addition, during the process of lubricating oil flowing from outlet filter 7 to bearing 3, temperature sensor 8 continuously monitors the temperature of lubricating oil in this section of the pipeline. Once the oil temperature is detected to exceed the preset range, a signal will be issued to prompt timely adjustment of the cooling efficiency of the first heat exchanger 6. Flow meter switch 9 monitors the flow rate of lubricating oil in this section of the pipeline in real time. When the flow rate is lower than the set value, flow meter switch 9 will trigger the corresponding protection mechanism to ensure that enough lubricating oil continues to enter bearing 3, ensuring that the lubrication effect of bearing 3 is not affected. Simultaneously, the second oil pump 14 starts, drawing lubricating oil from the second oil tank 12. Under the pressure of the second oil pump 14, the lubricating oil is transported to the second heat exchanger 15. The second heat exchanger 15 cools the lubricating oil through heat exchange with the cooling medium, ensuring that the lubricating oil is at a suitable working temperature. The cooled lubricating oil flows out of the second heat exchanger 15 and enters the independent filter 16. The independent filter 16 performs deep filtration on the lubricating oil, thoroughly removing impurities and ensuring the purity of the lubricating oil. The lubricating oil filtered by the independent filter 16 flows along the pipeline equipped with a pressure gauge 17 and a temperature gauge 18. The pressure gauge 17 monitors the pressure change of the lubricating oil in the pipeline in real time, while the temperature gauge 18 monitors the temperature of the lubricating oil in real time, so that the operator can keep track of the operating parameters of the right oil circuit. Finally, the treated lubricating oil flows back to the second oil tank 12.

[0020] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An oil supply device for the bearing housing of an extruder screw head, characterized in that, include: The cylinder (1) and multiple matching pipes are provided. A labyrinth seal (2) is symmetrically installed on the left side of the cylinder (1). A bearing (3) is installed at the end of the labyrinth seal (2) away from the cylinder (1). An inlet filter (4) is connected to the bottom end of the bearing (3) through a matching pipe. The first oil pump (5) and the inlet filter (4) are installed through a suitable pipeline. The first oil pump (5) is installed at the input end of the bottom of the first oil pump (5) and the first oil tank (501) is installed thereon. The first heat exchanger (6) is installed at the output end of the first oil pump (5) through a matching pipe. The top of the first heat exchanger (6) is installed with an outlet filter (7) through a matching pipe. The pipe connecting the outlet filter (7) and the bearing (3) is respectively equipped with a temperature sensor (8) and a flow meter switch (9). The flow meter switch (9) is located above the temperature sensor (8). Screws (10) are symmetrically installed inside the cylinder (1). The drive assembly is installed at the end of the cylinder (1) away from the labyrinth seal (2); The second oil tank (12) is installed below the end of the cylinder (1) away from the labyrinth seal (2). The second oil pump (14) is installed on the right side of the bottom of the second oil tank (12) through a matching pipe. The output end of the second oil pump (14) is installed with a second heat exchanger (15) through a matching pipe. The top of the second heat exchanger (15) is installed with an independent filter (16) through a matching pipe. A pressure gauge (17) and a temperature gauge (18) are installed on the outside of the matching pipe between the independent filter (16) and the second oil tank (12).

2. The oil supply device for the extruder screw head bearing housing according to claim 1, characterized in that, The drive assembly includes a gearbox (11), one side of which is fixedly connected to the end of the cylinder (1) away from the labyrinth seal (2), and a motor (13) is installed at the input end of the gearbox (11).

3. The oil supply device for the extruder screw head bearing housing according to claim 1, characterized in that, The top of the outlet filter (7) is fixedly connected to the bearing (3) away from the labyrinth seal (2) via a fitted pipe. This fitted pipe has two connection points that are installed with the two bearings (3) respectively.

4. The oil supply device for the extruder screw head bearing housing according to claim 1, characterized in that, The end of the independent filter (16) away from the second heat exchanger (15) is fixedly connected to the bottom left side of the second oil tank (12) through a matching pipe.

5. The oil supply device for the extruder screw head bearing housing according to claim 1, characterized in that, The pressure gauge (17) is located below the temperature gauge (18).

6. The oil supply device for the extruder screw head bearing housing according to claim 2, characterized in that, The output end of the gearbox (11) is fixedly connected to one end of the screw (10).

7. The oil supply device for the extruder screw head bearing housing according to claim 2, characterized in that, The bottom of the gearbox (11) is fixedly connected to the top of the second oil tank (12).

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