A cold pilger mill

Abstract

The application discloses a cold rolling pipe machine, which comprises a steel pipe and a bearing plate, an oil removing assembly is installed on the bearing plate, the oil removing assembly comprises an oil collecting sleeve installed on the periphery of the steel pipe, the oil collecting sleeve is fixed on the bearing plate, an annular oil absorbing plate is fixedly installed on the inner wall of the oil collecting sleeve, the annular oil absorbing plate is close to the annular inner wall of the steel pipe and is provided with penetrating holes in an annular array mode, an oil absorbing cavity is formed between the annular oil absorbing plate and the oil collecting sleeve, when the air pressure of the oil absorbing cavity is reduced, the oil attached to the outer wall of the steel pipe is absorbed into the inside of the oil collecting sleeve through the penetrating holes, a pump device for keeping low air pressure or negative pressure in the oil absorbing cavity is arranged, and the oil removing efficiency of the steel pipe can be improved, the oil recovery amount is increased, and the loss during oil recovery is reduced.

Description

Technical Field

[0001] This invention relates to the field of cold rolling mill technology, specifically to a cold rolling mill. Background Technology

[0002] During the rolling process, cold rolling mills apply rolling oil to the surface of the finished steel pipe, or add lubricating oil to the three or two rolls during production to reduce the deformation of the steel pipe and reduce the coefficient of friction during rolling, thereby maximizing the smoothness of the steel pipe surface.

[0003] However, lubricating oil or rolling oil will adhere to the outer wall of the steel pipe, affecting subsequent transfer and cleaning. Current degreasing devices remove and collect oil by scraping and sedimentation, which is inefficient and cannot meet the efficiency of more than 400 meters per minute of the new cold rolling mill in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a cold rolling mill that can improve the degreasing efficiency of steel pipes, increase the amount of oil recovered, and reduce the loss during oil recovery, thus solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cold rolling mill for tubes, comprising a steel tube and a bearing plate, wherein an oil removal assembly is installed on the bearing plate, the oil removal assembly comprising an oil collecting sleeve installed around the steel tube, the oil collecting sleeve being fixed to the bearing plate, and an annular oil suction plate being fixedly installed on the inner wall of the oil collecting sleeve, wherein the annular oil suction plate has permeation holes arranged in an annular array near the annular inner wall of the steel tube, and an oil suction chamber is formed between the annular oil suction plate and the oil collecting sleeve, wherein when the air pressure in the oil suction chamber decreases, the oil adhering to the outer wall of the steel tube will be sucked into the interior of the oil collecting sleeve through the permeation holes;

[0006] This includes pump equipment used to maintain low or negative pressure in the oil suction chamber.

[0007] Preferably, the pump device includes an annular square tube fixedly mounted on a support plate, a shaft collar rotatably connected to the inner wall of the annular square tube, a plurality of turbine blades fixedly mounted on the outer wall of the shaft collar, the plurality of turbine blades being distributed in an annular array, a bend connecting the tangent of the annular square tube, the other end of the bend connecting to the oil suction chamber on the oil collecting sleeve, and includes a driver for controlling the high-speed rotation of the shaft collar.

[0008] Preferably, an oil-absorbing body is fixedly installed on the inner wall of the oil suction chamber on the oil collecting sleeve, and the oil-absorbing body does not fill the inside of the oil collecting sleeve under normal conditions. The oil-absorbing body is made of oil-absorbing fiber and fits against the inner wall of the annular oil-absorbing plate. The oil-absorbing body can absorb the oil in the oil suction chamber and prevent the oil from entering the inside of the annular square tube.

[0009] Preferably, an annular inner plate is rotatably installed near the annular inner wall of the oil collecting sleeve, and the annular inner plate has a flow hole that is the same as the permeation hole. The annular inner plate is fitted inside the annular oil suction plate. When the annular inner plate rotates, it can close the permeation hole. The system includes a transmission component that controls the rotation of the annular inner plate.

[0010] The oil collecting sleeve is also equipped with a compression component that compresses and squeezes oil from the oil suction body.

[0011] Preferably, the compression assembly includes a pressure ring that slides along the moving direction of the steel pipe. The pressure ring is slidably installed inside the oil collecting sleeve. A first oil leakage hole is provided through the inner wall at the lowest point of the oil collecting sleeve. An oil collecting tank is fixedly installed on the outer wall at the lowest point of the oil collecting sleeve. The interior of the oil collecting tank communicates with the interior of the oil collecting sleeve through the first oil leakage hole. The assembly also includes a first electric telescopic rod fixedly installed on the outer wall of the oil collecting sleeve to control the sliding of the pressure ring. The output rod of the first electric telescopic rod is fixedly connected to the pressure ring.

[0012] Preferably, the transmission assembly includes a second electric telescopic rod fixedly installed on the outer wall of the oil collecting sleeve, a groove plate fixedly installed on the outer wall of the annular inner connecting plate, a travel limiting groove opened on the groove plate, a transmission pin slidably connected to the inner wall of the travel limiting groove, and the output end of the second electric telescopic rod hinged to the outer wall of the transmission pin. When the second electric telescopic rod is outputting or de-outputting, the annular inner connecting plate can be rotated through the groove plate.

[0013] Preferably, the transmission assembly includes an arc-shaped rack fixedly mounted on the outer wall of the annular inner plate, a servo motor fixedly mounted on the outer wall of the oil collecting sleeve, a gear fixedly mounted on the output end of the servo motor, and the gear meshing with the arc-shaped rack.

[0014] Preferably, the driver includes a collar extending through an annular square tube, the collar being rotatably connected to the through section, a first drive roller being fixedly mounted on the exposed outer wall of the collar, a second drive roller being rotatably connected to the outer wall of the support plate via a bearing seat, the second drive roller being connected to the first drive roller via a synchronous belt drive, and a main drive motor for controlling the rotation of the second drive roller being fixedly mounted on the outer wall of the support plate.

[0015] Preferably, a second oil leakage hole is provided at the lowest point of the annular square tube, and the turbine blades perform oil-gas separation on the oil-containing gas during high-speed rotation, and the gas can be discharged outward through the second oil leakage hole.

[0016] Preferably, a rubber ring is fixedly installed on the annular oil suction plate near the annular outer wall of the steel pipe. When the steel pipe passes through the oil collecting sleeve, the rubber ring will be squeezed and tightly adhered to the outer wall of the steel pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention involves installing an oil collecting sleeve and an annular oil suction plate on the outer wall of a steel pipe. This allows the annular oil suction plate to contact the outer wall of the steel pipe. A pump device can continuously maintain a low or negative pressure in the oil suction chamber. The pressure value can be adjusted according to the linear speed of the cold rolling mill. When the air pressure in the oil suction chamber is lower than the external low air pressure, the oil adhering to the outer wall of the steel pipe will be sucked into the interior of the oil suction chamber through the permeation holes, thereby more efficiently removing oil from the outer wall of the steel pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A schematic diagram of the right-side view structure;

[0021] Figure 3 For the present invention Figure 2 A schematic diagram of the structure viewed in section AA along the middle edge;

[0022] Figure 4 For the present invention Figure 1 A schematic diagram of a half-section three-dimensional structure;

[0023] Figure 5 For the present invention Figure 3 A schematic diagram of the structure viewed in section BB along the middle edge;

[0024] Figure 6 This is a first embodiment of the transmission component of the present invention;

[0025] Figure 7 This is a second embodiment of the transmission component of the present invention;

[0026] Figure 8 This is a partial structural assembly diagram of the oil removal component in this invention.

[0027] In the diagram: 1. Steel pipe; 2. Oil collecting sleeve; 3. Annular square tube; 4. Bend; 5. Bearing plate; 6. First transmission roller; 7. Second transmission roller; 8. Synchronous belt; 9. Main drive motor; 11. First electric telescopic rod; 12. Oil suction body; 13. Pressure ring; 14. Annular oil suction plate; 15. Annular inner connecting plate; 16. Turbine blade; 17. Shaft collar; 18. Rubber ring; 19. Oil collecting tank; 20. First oil leakage hole; 21. Arc-shaped rack; 22. Gear; 23. Second electric telescopic rod; 24. Groove plate; 25. Transmission pin; 26. Second oil leakage hole. Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 8 The present invention provides a technical solution: a cold rolling mill for tubes, including a steel pipe 1 and a bearing plate 5. An oil removal assembly is installed on the bearing plate 5. The oil removal assembly includes an oil collecting sleeve 2 installed on the periphery of the steel pipe 1. The oil collecting sleeve 2 is fixed on the bearing plate 5. An annular oil suction plate 14 is fixedly installed on the inner wall of the oil collecting sleeve 2. The annular oil suction plate 14 has permeation holes arranged in annular array near the annular inner wall of the steel pipe 1. An oil suction chamber is formed between the annular oil suction plate 14 and the oil collecting sleeve 2. When the air pressure in the oil suction chamber decreases, the oil adhering to the outer wall of the steel pipe 1 will be sucked into the interior of the oil collecting sleeve 2 through the permeation holes.

[0030] This includes pump equipment used to maintain low or negative pressure in the oil suction chamber.

[0031] This invention is mainly used to improve the efficiency of current degreasing equipment. Current degreasing equipment removes oil from the outer wall of steel pipe 1 and then uses a sedimentation tank below it to separate impurities from the oil. However, current cold rolling mills have made great progress, and their production line speed can reach at least 40 meters per second. This makes the existing oil scraping components prone to leakage, and the scraped oil is prone to splashing or entering the degreasing equipment, resulting in a decrease in collection efficiency and degreasing efficiency.

[0032] This invention uses an oil collecting sleeve 2 and an annular oil suction plate 14 fitted to the outer wall of a steel pipe 1, so that the annular oil suction plate 14 can contact the outer wall of the steel pipe 1. The pump equipment can continuously maintain a low air pressure or negative pressure in the oil suction chamber. The pressure value can be adjusted according to the linear speed of the cold rolling mill. When the air pressure in the oil suction chamber is lower than the low air pressure outside, the oil adhering to the outer wall of the steel pipe 1 will be sucked into the interior of the oil suction chamber through the permeation hole. In addition, the permeation hole can block some impurities.

[0033] The annular coating effectively removes oil from the steel pipe 1 from all directions.

[0034] The degreasing assembly of the present invention can be assembled as the main degreasing device of a cold rolling mill, or as an additional degreasing device.

[0035] In a preferred embodiment, the pump device includes an annular square tube 3 fixedly mounted on a support plate 5, a collar 17 rotatably connected to the inner wall of the annular square tube 3, a plurality of turbine blades 16 fixedly mounted on the outer wall of the collar 17, the plurality of turbine blades 16 being distributed in an annular array, a bend 4 being connected to the tangent of the annular square tube 3, and the other end of the bend 4 being connected to the oil suction chamber on the oil collecting sleeve 2, and includes a driver for controlling the high-speed rotation of the collar 17.

[0036] Please see details Figure 5 The present invention uses an annular square tube 3 to cooperate with the operation of the turbine blade 16. When the driver is working, the shaft collar 17 and its turbine blade 16 can rotate at high speed, thereby drawing air from inside the oil collecting sleeve 2 into the annular square tube 3 through the bend 4, so that the inside of the oil collecting sleeve 2 can always maintain a low air pressure or negative pressure state. At this time, the oil suction chamber can work to remove oil.

[0037] The annular square tube 3 can be connected to and installed as a pipe for exhaust, which is not shown in the present invention and the accompanying drawings. It can also discharge oily gas or impact the oil-absorbing wall, which will not be described here.

[0038] To prevent oil or oily gas in the oil absorption chamber from entering the annular square tube 3 through the bend 4, this invention proposes to fix an oil-absorbing body 12 on the inner wall of the oil absorption chamber on the oil collecting sleeve 2. Under normal conditions, the oil-absorbing body 12 does not fill the interior of the oil collecting sleeve 2. The oil-absorbing body 12 is made of oil-absorbing fiber and fits against the inner wall of the annular oil-absorbing plate 14. The oil-absorbing body 12 can absorb the oil in the oil absorption chamber and prevent the oil from entering the annular square tube 3.

[0039] Please see details Figure 3 and Figure 4 By fixing an oil-absorbing body 12 around the annular oil-absorbing plate 14, most of the oil can be absorbed by the oil-absorbing body 12, thereby forming a barrier layer between the oil-absorbing chamber and the annular square tube 3, thus effectively preserving the oil adhering to the steel pipe 1.

[0040] Further, please refer to Figure 1 This embodiment provides a method for rotating the collar 17. The driver includes a collar 17 that passes through the annular square tube 3 and is rotatably connected to the through-hole. A first transmission roller 6 is fixedly installed on the exposed outer wall of the collar 17. A second transmission roller 7 is rotatably connected to the outer wall of the bearing plate 5 through a bearing seat. The second transmission roller 7 and the first transmission roller 6 are connected by a synchronous belt 8. A main drive motor 9 that controls the rotation of the second transmission roller 7 is fixedly installed on the outer wall of the bearing plate 5.

[0041] Furthermore, an annular inner plate 15 is rotatably installed on the inner wall of the oil collecting sleeve 2 near the annular inner wall of the steel pipe 1. The annular inner plate 15 is fitted inside the annular oil suction plate 14. The annular inner plate 15 has a flow hole that is the same as the permeation hole. When the annular inner plate 15 rotates, it can close the permeation hole. This includes a transmission component that controls the rotation of the annular inner plate 15.

[0042] The inside of the oil collecting sleeve 2 is also equipped with a compression component that compresses and squeezes oil from the oil suction body 12.

[0043] Based on the oil suction body 12, the oil suction body 12 will always be filled with oil and will approach saturation. At this time, the annular inner plate 15 needs to be rotated by the transmission component to change the permeation hole and the flow hole from the docking state to the staggered state, thereby sealing the permeation hole and preventing the oil inside the oil suction body 12 from transferring to the outer wall through the permeation hole during compression. When the compression component is started, the oil inside the oil suction body 12 can be squeezed out and accumulated in the inner bottom of the oil collection sleeve 2.

[0044] In particular, during the compression process, the steel pipe 1 should not be discharged, that is, the compression process should be carried out after each steel pipe 1 is discharged to avoid oil leakage. Secondly, the current cold rolling tube mills are all continuous feeding type, which will have the working time of the compression components. Mechanical or servo-type stop feeding cold rolling tube mills have more sufficient material change compression time. Furthermore, the oil removal capacity of the oil suction body 12 and the oil collecting sleeve 2 can also be increased, that is, the oil collecting sleeve 2 can be extended along the length of the steel pipe 1 wall or the ring diameter of the oil collecting sleeve 2 can be increased.

[0045] The compression assembly includes a pressure ring 13 that slides along the moving direction of the steel pipe 1. The pressure ring 13 is slidably installed inside the oil collecting sleeve 2. A first oil leakage hole 20 is provided through the inner wall at the lowest point of the oil collecting sleeve 2. An oil collecting tank 19 is fixedly installed on the outer wall at the lowest point of the oil collecting sleeve 2. The interior of the oil collecting tank 19 is connected to the interior of the oil collecting sleeve 2 through the first oil leakage hole 20. The assembly also includes a first electric telescopic rod 11 that is fixedly installed on the outer wall of the oil collecting sleeve 2 to control the sliding of the pressure ring 13. The output rod of the first electric telescopic rod 11 is fixedly connected to the pressure ring 13.

[0046] Please see Figure 3 and Figure 4 In this embodiment, the compression method is to compress the oil suction body 12 along the axial direction of the oil collecting sleeve 2. When the oil storage of the oil suction body 12 reaches a certain level, the pressure ring 13 quickly compresses and squeezes the oil from the oil suction body 12. Since a part of the oil suction body 12 is fixedly installed on the outer wall of the annular oil suction plate 14, the pressure ring 13 can scrape and squeeze the oil suction body 12, thereby fully compressing the oil suction body 12 and increasing the oil discharge of the oil suction body 12.

[0047] Secondly, this embodiment is also used to collect or recycle the oil stored inside the oil collecting sleeve 2. The first oil leakage hole 20 can be configured to be wider at the top and narrower at the bottom to avoid backflow.

[0048] Please see details Figure 3 and Figure 4 The lowest point of the annular square tube 3 is provided with a second oil leakage hole 26. The turbine blades 16 perform oil-gas separation on the oil-containing gas during high-speed rotation, and the gas can be discharged outward through the second oil leakage hole 26. This embodiment is for oil-gas separation, which reduces the oil-containing gas in the annular square tube 3.

[0049] The following provides two embodiments for rotating the annular inner plate 15.

[0050] First embodiment:

[0051] The transmission assembly includes a second electric telescopic rod 23 fixedly installed on the outer wall of the oil collecting sleeve 2, a groove plate 24 fixedly installed on the outer wall of the annular inner connecting plate 15, a travel limiting groove is provided on the groove plate 24, and a transmission pin 25 is slidably connected to the inner wall of the travel limiting groove. The output end of the second electric telescopic rod 23 is hinged to the outer wall of the transmission pin 25. When the second electric telescopic rod 23 is output or outputting, the annular inner connecting plate 15 can be rotated through the groove plate 24.

[0052] Please see Figure 6 Because the rotation of the annular inner plate 15 is wetted by oil, it has a good rotation coefficient and its sliding friction resistance is greatly reduced. Therefore, when the annular inner plate 15 rotates, it is only necessary to keep the annular inner plate 15 locked. Therefore, the embodiment provides locking force to the annular inner plate 15 through the second electric telescopic rod 23. When the second electric telescopic rod 23 is input and output, it will cause the groove plate 24 to drive the annular inner plate 15 to deflect. The stroke limiting groove provides space for the sliding and transmission of the transmission pin 25.

[0053] Second embodiment:

[0054] The transmission assembly includes an arc-shaped rack 21 fixedly mounted on the outer wall of the annular inner plate 15, a servo motor fixedly mounted on the outer wall of the oil collecting sleeve 2, and a gear 22 fixedly mounted on the output end of the servo motor, which meshes with the arc-shaped rack 21.

[0055] Please see Figure 7 The difference between this embodiment and the first embodiment is that it adopts a servo control method, which can better control the rotation of the annular inner plate 15. In addition to better sealing the permeation hole, it can also adjust the flow rate of the permeation hole as needed.

[0056] Furthermore, a rubber ring 18 is fixedly installed on the annular oil suction plate 14 near the annular outer wall of the steel pipe 1. When the steel pipe 1 passes through the oil collecting sleeve 2, the rubber ring 18 will be squeezed and tightly adhered to the outer wall of the steel pipe 1. The rubber ring 18 can scrape off most of the oil and keep the oil inside the annular oil suction plate 14, which is more conducive to the oil removal work of the oil suction chamber.

[0057] In summary, the present invention can improve the oil removal efficiency of steel pipe 1, increase the amount of oil recovered, and reduce the loss during oil recovery.

[0058] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold rolling mill for tubes, comprising a support plate (5), characterized in that: An oil removal assembly is installed on the bearing plate (5). The oil removal assembly includes an oil collection sleeve (2) installed around the steel pipe (1). The oil collection sleeve (2) is fixed on the bearing plate (5). An annular oil suction plate (14) is fixedly installed on the inner wall of the oil collection sleeve (2). The annular oil suction plate (14) has permeation holes arranged in an annular array near the annular inner wall of the steel pipe (1). An oil suction chamber is formed between the annular oil suction plate (14) and the oil collection sleeve (2). When the air pressure in the oil suction chamber decreases, the oil adhering to the outer wall of the steel pipe (1) will be sucked into the interior of the oil collection sleeve (2) through the permeation holes. This includes pump equipment used to maintain low or negative pressure in the oil suction chamber; The pump device includes an annular square tube (3) fixedly installed on a support plate (5). A collar (17) is rotatably connected to the inner wall of the annular square tube (3). Multiple turbine blades (16) are fixedly installed on the outer wall of the collar (17). The multiple turbine blades (16) are distributed in an annular array. The tangent of the annular square tube (3) is connected to a bend (4). The other end of the bend (4) is connected to the oil suction chamber on the oil collecting sleeve (2). The pump device includes a driver that controls the high-speed rotation of the collar (17). An oil-absorbing body (12) is fixedly installed on the inner wall of the oil-absorbing chamber on the oil collecting sleeve (2). Under normal conditions, the oil-absorbing body (12) does not fill the inside of the oil collecting sleeve (2). The oil-absorbing body (12) is made of oil-absorbing fiber. The oil-absorbing body (12) is attached to the inner wall of the annular oil-absorbing plate (14). The oil-absorbing body (12) can absorb the oil in the oil-absorbing chamber and prevent the oil from entering the annular square tube (3). The oil collecting sleeve (2) is rotatably installed with an annular inner plate (15) near the annular inner wall of the steel pipe (1). The annular inner plate (15) has a flow hole that is the same as the permeation hole. The annular inner plate (15) is fitted inside the annular oil suction plate (14). When the annular inner plate (15) rotates, it can close the permeation hole. The annular inner plate (15) includes a transmission component that controls the rotation of the annular inner plate (15). The oil collecting sleeve (2) is also equipped with a compression component that compresses and squeezes oil from the oil suction body (12).

2. The cold rolling mill according to claim 1, characterized in that: The compression assembly includes a pressure ring (13) that slides along the moving direction of the steel pipe (1). The pressure ring (13) is slidably installed inside the oil collecting sleeve (2). The inner wall of the lowest point of the oil collecting sleeve (2) is provided with a first oil leakage hole (20). An oil collecting tank (19) is fixedly installed on the outer wall of the lowest point of the oil collecting sleeve (2). The interior of the oil collecting tank (19) is connected to the interior of the oil collecting sleeve (2) through the first oil leakage hole (20). The assembly also includes a first electric telescopic rod (11) that is fixedly installed on the outer wall of the oil collecting sleeve (2) to control the sliding of the pressure ring (13). The output rod of the first electric telescopic rod (11) is fixedly connected to the pressure ring (13).

3. The cold rolling mill according to claim 1, characterized in that: The transmission assembly includes a second electric telescopic rod (23) fixedly installed on the outer wall of the oil collecting sleeve (2). A groove plate (24) is fixedly installed on the outer wall of the annular inner plate (15). A travel limiting groove is provided on the groove plate (24). A transmission pin (25) is slidably connected to the inner wall of the travel limiting groove. The output end of the second electric telescopic rod (23) is hinged to the outer wall of the transmission pin (25). When the second electric telescopic rod (23) is output, the annular inner plate (15) can be rotated through the groove plate (24).

4. The cold rolling mill according to claim 1, characterized in that: The transmission assembly includes an arc-shaped rack (21) fixedly installed on the outer wall of the annular inner plate (15), a servo motor fixedly installed on the outer wall of the oil collecting sleeve (2), and a gear (22) fixedly installed at the output end of the servo motor, which meshes with the arc-shaped rack (21).

5. The cold rolling mill according to claim 1, characterized in that: The driver includes a collar (17) that passes through an annular square tube (3) and is rotatably connected to the through point. A first drive roller (6) is fixedly installed on the exposed outer wall of the collar (17). A second drive roller (7) is rotatably connected to the outer wall of the bearing plate (5) through a bearing seat. The second drive roller (7) and the first drive roller (6) are connected by a synchronous belt (8). A main drive motor (9) that controls the rotation of the second drive roller (7) is fixedly installed on the outer wall of the bearing plate (5).

6. The cold rolling mill according to claim 1, characterized in that: The lowest point of the annular square tube (3) is provided with a second oil leakage hole (26). The turbine blade (16) separates the oil-containing gas during high-speed rotation and discharges it outward through the second oil leakage hole (26).

7. The cold rolling mill according to any one of claims 1-6, characterized in that: A rubber ring (18) is fixedly installed on the annular oil suction plate (14) near the annular outer wall of the steel pipe (1). When the steel pipe (1) passes through the oil collection sleeve (2), the rubber ring (18) will be squeezed and tightly adhered to the outer wall of the steel pipe (1).

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