An oil leakage recovery device for a down-type electric cylinder driving system and a down-type electric cylinder driving system

Abstract

The application relates to an oil leakage recovery device for a down-type electric cylinder driving system and the down-type electric cylinder driving system. In the application, a servo motor of the down-type electric cylinder driving system is fixed below a ball screw, an oil leakage tank is arranged below a lubricating oil tank, the bottom of the oil leakage tank is an oil seal seat connected with the ball screw in a rotating mode, and an oil leakage protection recovery device is arranged below the oil seal seat. The oil leakage recovery device comprises an oil leakage receiving unit for receiving oil leakage and a cooling circulation unit for cooling the oil leakage and conveying the oil leakage to the lubricating oil tank. The application can not only avoid high-altitude operation, improve equipment operation safety and maintenance convenience, but also effectively avoid the possibility that lubricating oil temperature and oil leakage enter a low-position servo motor.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment, specifically to an oil leakage recovery device for a lower-mounted electric cylinder drive system and the lower-mounted electric cylinder drive system. Background Technology

[0002] Electric cylinder pumping units are a widely promoted energy-saving, environmentally friendly, and efficient oil extraction method in the current oil extraction field, and also a long-term focus of the applicant's oil equipment manufacturing efforts. The electric cylinder pumping unit uses a servo motor as its output power, which, through the application of a ball screw, directly forms the electric cylinder drive system to drive the walking beam up and down. Assisted by an adjustable counterweight, the up-and-down swing of the walking beam drives the pumping head up and down, thus achieving stable and efficient oil extraction. The electric cylinder drive system, which provides the power, is a key component in this process.

[0003] In recent years, the applicant has vigorously researched and applied for a series of patents related to oil pumping units, including 201810655255.X, 202021887556.4, and 202110293327.2, mainly focusing on the design and use of electric cylinder driven oil pumping units. Currently, some equipment has been tested and put into production in oil fields. These are significantly ahead of domestic and foreign competitors, providing conditions for large-scale application in oil fields and achieving energy-saving and high-efficiency oil pumping. However, the existing electric cylinder drive system used in electric cylinder oil pumping units has the following technical problems: the servo motor is installed at a high position, which makes maintenance difficult. Once a fault occurs, in addition to stopping the machine, the electric cylinder drive system of the oil pumping unit must be disassembled to open the servo motor, which greatly increases the maintenance cost. If the servo motor is installed at a low position, there are problems with high lubricating oil temperature and oil leakage. Excessive oil temperature will require the machine to be stopped for cooling after a period of operation, affecting work efficiency. Oil leakage not only makes the overall appearance of the equipment unclean and untidy, but also results in poor performance due to insufficient lubricating oil. More seriously, oil leakage may enter the servo motor and burn out the equipment. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an oil leakage recovery device and a lower-mounted electric cylinder drive system for a lower-mounted electric cylinder drive system, thereby solving technical problems such as high lubricating oil temperature, oil leakage, and maintenance difficulties in the lower-mounted electric cylinder drive system.

[0005] To achieve the above-mentioned objectives, the technical solution provided by this utility model is as follows: This utility model first provides an oil leakage recovery device for a lower-mounted electric cylinder drive system. The lower-mounted electric cylinder drive system includes a ball screw and a servo motor. The servo motor is fixed below the ball screw, and its output axis is fixedly connected to the ball screw. The servo motor is fixedly connected to a bearing housing. The ball screw is fixed to the bearing housing via a main bearing. A ball screw nut on the ball screw is fixedly connected to the bottom of the inner tube of the electric cylinder. An outer tube of the electric cylinder is provided outside the inner tube. The bottom of the outer tube is fixed to the bearing housing. A lubricating oil pool surrounding part of the ball screw is provided at the bottom of the inner tube. The bottom of the lubricating oil pool is the main bearing and the bearing housing. The outer tube of the electric cylinder surrounds the lubricating oil pool. An oil drain pool is provided below the lubricating oil pool, surrounding part of the ball screw. The bottom of the oil drain pool is an oil seal seat rotatably connected to the ball screw. The upper end of the oil seal seat abuts against the lower end of the bearing housing to form a pool. An oil leakage protection and recovery device is provided below the oil seal seat. The oil leakage recovery device includes an oil leakage receiving unit and a cooling circulation unit. The oil leakage receiving unit is used to receive lubricating oil leaking from the oil drain pool along the ball screw. The cooling circulation unit is used to cool the leaking oil and then transport the cooled leaking oil back to the lubricating oil pool. The oil leakage receiving unit is connected to the cooling circulation unit.

[0006] In an oil leakage recovery device for a lower-mounted electric cylinder drive system according to this utility model, the outer periphery of the oil seal seat protrudes upward, the oil seal seat is fixedly connected to the bearing seat, the protruding end of the outer periphery of the oil seal seat abuts against the lower end face of the bearing seat, the oil drain pool is surrounded by the inner wall of the bearing seat and the inner wall of the oil seal seat, and the top of the oil drain pool is the main bearing.

[0007] In an oil leakage recovery device for a bottom-mounted electric cylinder drive system according to the present invention, a PTFE oil retainer ring is installed on the oil seal seat, and the PTFE oil retainer ring is embedded between the oil seal seat and the ball screw.

[0008] In an oil leakage recovery device for a lower-mounted electric cylinder drive system according to the present invention, a skeleton oil seal is also installed on the oil seal seat. The skeleton oil seal is embedded with its opening facing upward between the oil seal seat, the ball screw and the PTFE oil retainer ring, and the skeleton oil seal is located below the PTFE oil retainer ring.

[0009] In an oil leakage recovery device for a lower-mounted electric cylinder drive system according to the present invention, the upper surface of the oil seal seat is provided with a magnetic attraction for adsorbing iron-containing impurities in the lubricating oil.

[0010] In an oil leakage recovery device for a bottom-mounted electric cylinder drive system according to this utility model, the oil leakage receiving unit is located below the oil drain pool. The oil leakage receiving unit includes an oil slinger and an oil receiving plate. The oil slinger is fixed on the ball screw, and the lubricating oil leaking downward along the ball screw drips onto the oil slinger. The oil receiving plate is a hollow disc and is fixed below the oil seal seat. The distance between the oil receiving plate and the lower surface of the oil seal seat is greater than the distance between the oil slinger and the lower surface of the oil seal seat. The distance between the inner periphery of the oil receiving plate and the ball screw is less than the distance between the outer periphery of the oil slinger and the ball screw. Both the outer and inner peripheries of the oil receiving plate protrude upwards. The protruding end of the outer periphery of the oil receiving plate abuts against the lower surface of the oil seal seat. The outer periphery of the oil slinger extends downwards, and the downwardly extending part of the outer periphery of the oil slinger overlaps with the upwardly protruding part of the inner periphery of the oil receiving plate.

[0011] In an oil leakage recovery device for a lower-mounted electric cylinder drive system according to the present invention, the cooling circulation unit includes an oil return branch pipe, an oil drain main pipe, an oil pump motor, a cooler, and an oil return main pipe. The oil return branch pipe is connected to an oil receiving pan, and an oil return connector is provided on the oil receiving pan for connecting the oil return branch pipe. The oil return branch pipe is connected to the oil drain main pipe, which is connected in sequence to the oil pump motor and the cooler, and is connected to the lubricating oil sump through the oil return main pipe.

[0012] In an oil leakage recovery device for a bottom-mounted electric cylinder drive system according to the present invention, the cooling circulation unit further includes an oil drain branch pipe, a T-joint and a filter. The oil drain branch pipe is connected to the lubricating oil sump. An oil drain joint is provided at the bottom of the lubricating oil sump to connect the oil drain branch pipe. The oil drain branch pipe and the return oil branch pipe are connected to the main oil drain pipe through the T-joint. The main oil drain pipe is connected to the oil pump motor after passing through the filter.

[0013] This utility model also provides a bottom-mounted electric cylinder drive system, including the aforementioned oil leakage recovery device.

[0014] Based on the above technical solutions, the oil leakage recovery device and the lower-mounted electric cylinder driven pumping unit provided by this utility model have achieved the following beneficial effects after practical application in oil fields: 1. The oil leakage recovery device for the bottom-mounted electric cylinder drive system of this utility model adopts a scheme with the servo motor at the bottom. The servo motor at the bottom provides upward power to drive the roller screw to rotate. The ball screw nut drives the inner tube of the electric cylinder to move up and down. Then, the swing seat of the inner tube drives the walking beam to swing up and down. By placing the servo motor in the swing frame of the electric cylinder at the bottom, closer to the oil pump base on the ground, the machine can be stopped and repaired in time if a problem occurs, thus avoiding the high-altitude operation of the original technology and greatly improving safety and maintenance convenience.

[0015] 2. The oil leakage recovery device for the lower-mounted electric cylinder drive system of this utility model is equipped with a special oil leakage protection and recovery device. By setting a special oil seal seat at the bottom of the main bearing, and inverting the skeleton oil seal in the oil seal seat, the lubricating oil leakage is blocked to the greatest extent. The small amount of leaked lubricating oil is thrown out by the oil slinger to the oil receiving tray, which collects and stores the thrown-out lubricating oil. Then, it is circulated, filtered and recovered by the external cooling circulation unit, and finally returned to the lubricating oil pool. This effectively solves the problems of high lubricating oil temperature and oil leakage when the servo motor is installed in a low position, ensuring that the overall appearance of the equipment is clean and tidy, and avoiding the possibility of oil leakage entering the servo motor and burning out the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a bottom-mounted electric cylinder drive system according to this application.

[0017] Figure 2 This is a schematic diagram of the connection between the ball screw and the inner and outer tubes in a bottom-mounted electric cylinder drive system according to this application.

[0018] Figure 3 This application presents a schematic diagram of the structure of an oil leakage receiving unit in an oil leakage recovery device for a lower-mounted electric cylinder drive system.

[0019] Figure 4 This is a schematic diagram of the cooling circulation unit in an oil leakage recovery device for a lower-mounted electric cylinder drive system according to this application.

[0020] Figure 5 yes Figure 3 A magnified diagram of circle A in the middle.

[0021] In the picture: 1—Servo motor, 2—Electric cylinder swing frame, 3—Bearing housing, 4—Coupling, 5—Ball screw, 6—Ball screw nut, 7—Main bearing, 8—Electric cylinder outer tube, 9—Electric cylinder inner tube, 10—Inner tube swing seat, 11—Radial adjusting bearing, 12—Inner and outer tube straightening and anti-leakage device, 13—Support cylinder, 14—Oil seal seat, 1401—PTFE oil retainer ring, 1402—Skeleton oil seal, 1403—Magnetic suction, 15—Oil slinger, 16—Oil receiving tray, 17—Lubricating oil sump, 1701—Oil drain sump, 18—Permanent magnet brake, 19—Oil drain branch pipe, 20—Oil return branch pipe, 21—T-joint, 22—Oil drain main pipe, 23—Filter, 24—Oil pump motor, 25—Cooler, 26—Oil return main pipe 33—Screw locking nut, 34—Oil drain connector, 35—Oil return connector, 36—Upper guide sleeve of inner and outer tubes, 37—Fixing nut, 38—Lower guide sleeve of inner and outer tubes. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] The main purpose of this application is to solve the problems of operational safety and oil leakage that have occurred in the practical application of our previous patented technology. The aim is to redesign a bottom-mounted electric cylinder drive system and a brand-new oil pump based on the newly designed oil leakage recovery device for the bottom-mounted electric cylinder drive system. Example 1

[0024] The structure of the lower-mounted electric cylinder drive system in this embodiment includes an outer cylinder tube 8, an inner cylinder tube 9, a ball screw 5, a servo motor 1, and an electric cylinder swing frame 2. The bottom of the electric cylinder swing frame 2 is connected to the electric cylinder base of the pumping unit, typically using a swingable connection. A bearing seat 3 is located at the top of the electric cylinder swing frame 2, and this bearing seat 3 is embedded in the inner wall of the electric cylinder swing frame 2 to achieve a secure fixation and prevent shaking, primarily to withstand more weight and vibration. The servo motor 1 is located inside the electric cylinder swing frame 2. This servo motor 1 provides output power, typically a servo motor with brakes, and drives the electric cylinder according to program instructions.

[0025] The servo motor 1 is fixed upwards to the bearing housing 3 via a support cylinder 13. Specifically, the end of the servo motor 1 (non-output shaft) is fixed to one end of the support cylinder 13, and the other end of the support cylinder 13 is fixed to the bearing housing 3, ensuring that the centers of the servo motor 1, the support cylinder 13, and the bearing housing 3 are on the same axis. It can be seen that the servo motor 1 is integrally arranged at the bottom of the electric cylinder drive system, hence it is called an oil leakage recovery device for a bottom-mounted electric cylinder drive system. This ensures that the servo motor 1 is always at the bottom of the electric cylinder drive system, facilitating daily maintenance and allowing for timely inspection and repair in case of malfunction. Therefore, compared to existing technologies where the motor is located at the top, this provides greater safety and maintenance convenience.

[0026] The output shaft of the aforementioned servo motor 1 is connected upwards to the ball screw 5 via a coupling 4. The ball screw 5 is fixed to the bearing housing 3 via a main bearing 7, and the portion of the ball screw 5 extending downwards from the main bearing 7 is fixed using a screw locking nut 33. That is, the bottom of the ball screw 5 passes downwards through the main bearing 7 and is fixed to the output shaft of the servo motor 1 via the coupling 4.

[0027] The ball screw nut 6 on the ball screw 5 is fixedly connected to the bottom of the inner tube 9 of the electric cylinder. The top of the ball screw 5 is slidably mounted in the inner tube 9 of the electric cylinder via a radial adjusting bearing 11. That is, the top of the ball screw 5 slides up and down in the inner tube 9 of the electric cylinder along with the radial adjusting bearing 11. A guide strip, typically made of PTFE, is embedded on the edge sidewall of the radial adjusting bearing, and slides in contact with the inner wall of the inner tube 9. The ball screw nut 6 moves forward or backward on the ball screw 5, causing the inner tube 9 of the electric cylinder to move forward or backward. The top of the inner tube 9 of the electric cylinder is connected to the walking beam of the pumping unit via an inner tube swing seat 10.

[0028] The bottom of the outer tube 8 of the electric cylinder is fixed to the bearing seat 3 at the top of the electric cylinder swing frame 2 by screws. The inner tube 9 of the electric cylinder is threadedly connected to the ball screw nut 6 and moves linearly up and down within the outer tube 8 with the ball screw nut 6, thereby driving the walking beam of the pumping unit to swing up and down around the central fulcrum. An electric cylinder piston mechanism is provided between the outer tube 8 and the inner tube 9, specifically including upper guide sleeves 36, a fixing nut 37, and lower guide sleeves 38. The inner tube 9 is fixed to the ball screw nut 6 by the fixing nut 37 through the upper guide sleeves 36 and the lower guide sleeves 38. The upper guide sleeves 36 are located above the fixing nut 37, while the lower guide sleeves 38 are located below the fixing nut 37. The upper guide sleeves 36 and the lower guide sleeves 38 constitute the electric cylinder piston mechanism, allowing the inner tube 9 to move piston-like within the outer tube 8.

[0029] A lubricating oil sump 17 surrounding a portion of the ball screw 5 is provided at the bottom of the outer tube 8 and inner tube 9 of the electric cylinder. Below the lubricating oil sump 17 is an oil drain sump 1701, which also surrounds a portion of the ball screw 5. In this embodiment, the oil drain sump 1701 surrounds the screw locking nut 33. When the ball screw 5 rotates, some lubricating oil flows downwards into the oil drain sump 1701 along the gap between the main bearing 7 and the ball screw 5. The bottom of the lubricating oil sump 17 is the main bearing 7 and bearing seat 3. The outer tube 8 of the electric cylinder surrounds the lubricating oil sump 17, and the top of the lubricating oil sump 17 is the ball screw nut 6 and the lower guide sleeves 38 of the inner and outer tubes of the electric cylinder piston mechanism. The bottom of the oil drain sump 1701 is an oil seal seat 14, and the inner walls of the bearing seat 3 and oil seal seat 14 surround the oil drain sump 1701. The top of the oil drain sump 1701 is the main bearing 7. The oil seal seat 14 is sleeved on the ball screw 5 and is rotatably connected to the ball screw 5. The inner radius of the oil seal seat 14 is equal to the inner radius of the bearing seat 3. The outer periphery of the oil seal seat 14 protrudes upward. The oil seal seat 14 is fixedly connected to the bearing seat 3. The protruding end of the outer periphery of the oil seal seat 14 abuts against the lower end face of the bearing seat 3 to prevent lubricating oil from leaking out between the protruding end of the oil seal seat 14 and the lower end face of the bearing seat 3. The oil seal seat 14 is equipped with a PTFE oil retainer ring 1401, a skeleton oil seal 1402, and a magnetic 1403. The PTFE oil retainer ring 1401 and the skeleton oil seal 1402 are both embedded between the oil seal seat 14 and the ball screw 5. The skeleton oil seal 1402 is located below the PTFE oil retainer ring 1401, with its opening facing upward. The magnetic 1403 is located on the upper surface of the oil seal seat 14. The combination of a PTFE oil retainer ring and a skeleton oil seal reduces lubricating oil leakage from top to bottom, while the magnetic attraction is used to adsorb iron-containing impurities in the lubricating oil, achieving cleaning and impurity removal. The main function of the PTFE oil retainer ring is to isolate the impact of the lubricating oil driven by the motor during forward and reverse rotation on the skeleton oil seal, increasing the stability of the oil seal, and also reducing the pressure of the lubricating oil on the skeleton oil seal. The fit clearance between the PTFE oil retainer ring and the ball screw shaft is within 0.01 mm.

[0030] An oil leakage protection and recovery device is installed below the oil seal seat 14. The purpose is to prevent lubricating oil leakage as much as possible, and to recover and dispose of any unavoidable leakage of lubricating oil. This ensures that the inside of the support cylinder 13 remains clean and that no oil leaks appear on the outside of the electric cylinder swing frame 2. It also prevents leaked lubricating oil from entering the servo motor 1 and damaging the operation of the servo motor 1.

[0031] The oil leakage prevention and recovery device includes an oil leakage receiving unit and a cooling circulation unit. The oil leakage receiving unit includes an oil slinger 15 and an oil receiving tray 16. The oil slinger 15 is fixed to the ball screw 5, and the lubricating oil leaking downwards along the ball screw 5 drips onto the oil slinger 15. The oil receiving tray 16 is a hollow disc and is fixed below the oil seal seat 14. The distance between the oil receiving tray 16 and the lower surface of the oil seal seat 14 is greater than the distance between the oil slinger 15 and the lower surface of the oil seal seat 14. The distance between the inner periphery of the oil receiving pan 16 and the ball screw 5 is less than the distance between the outer periphery of the oil slinger 15 and the ball screw 5. Both the outer and inner peripheries of the oil receiving pan 16 protrude upwards, with the protruding end of the outer periphery of the oil receiving pan 16 abutting against the lower surface of the oil seal seat 14. The outer periphery of the oil slinger 15 extends downwards, and the downwardly extending part of the outer periphery of the oil slinger 15 overlaps with the upwardly protruding part of the inner periphery of the oil receiving pan 16, thereby preventing oil leakage from the oil receiving pan 16. The oil slinger 15, installed on the ball screw 5, throws the leaking oil from the skeleton oil seal onto the oil receiving pan 16.

[0032] The oil leakage receiving unit is housed inside the support cylinder 13, which keeps the exterior clean and prevents oil leakage from affecting use. However, oil leakage on the oil receiving pan 16 still needs to be addressed, so the oil leakage receiving unit is also connected to a cooling circulation unit for cooling the leaking oil.

[0033] The cooling circulation unit includes a return oil branch pipe 20, a drain oil main pipe 22, an oil pump motor 24, a cooler 25, and a return oil main pipe 26. The return oil branch pipe 20 is connected to an oil receiving pan 16, and an oil return connector 35 is provided on the oil receiving pan 16 for connecting the return oil branch pipe 20. The return oil branch pipe 20 communicates with the drain oil main pipe 22, which is connected in sequence to the oil pump motor 24 and the cooler 25, and is connected to the lubricating oil sump 17 through the return oil main pipe 26.

[0034] The cooling circulation unit also includes an oil drain branch pipe 19, a tee connector 21, and a filter 23. The oil drain branch pipe 19 is connected to the lubricating oil sump 17. An oil drain connector 34 is located at the bottom of the lubricating oil sump 17 to connect to the oil drain branch pipe 17. The oil drain branch pipe 19 and the return oil branch pipe 20 are connected to the main oil drain pipe 22 via the tee connector 21. In this embodiment, the main oil drain pipe 22 passes through the filter 23 before connecting to the oil pump motor 24. Whether it is overheated lubricating oil or contaminated lubricating oil in the lubricating oil sump 17, it can be cleaned and cooled through filtration and cooling. Furthermore, the leaked lubricating oil collected in the oil pan 16 can also be filtered, cooled, and then recycled as a whole. Powered by the oil pump motor, it is returned to the lubricating oil sump 17 through the main oil return pipe 26. In this way, by designing a dedicated cooling circulation unit, the total amount of lubricating oil in the lubricating oil sump 17 can be kept stable, and the operating temperature can be maintained at the set temperature, ensuring the safe and stable operation of the ball screw 5 and maintaining the long-term safe operation of the entire system.

[0035] Servo motor 1 is a servo motor with a brake. A permanent magnet brake 18 is also provided between servo motor 1 and support cylinder 13. Since the servo motor with brake has a built-in stopping braking function, a permanent magnet brake 18 is specifically designed to enhance the braking effect and achieve double braking protection. The braking component of the permanent magnet brake 18 is clamped onto the output shaft of servo motor 1. During installation, the upper end of servo motor 1 is fixed to the bottom of permanent magnet brake 18, and the top of permanent magnet brake 18 is fixed to support cylinder 13. The top of support cylinder 13 is fixed to the bottom of bearing seat 3. A coupling 4 is provided inside support cylinder 13. One end of coupling 4 is connected to the output shaft of servo motor 1, and the other end is connected to the bottom of ball screw 5. The coupling 4 is a split diaphragm coupling, which detachably connects the output shaft of servo motor 1 and the end of ball screw 5. The purpose of setting up the split diaphragm coupling is to facilitate maintenance and repair of the components at the bottom of the main bearing 7. Example 2

[0036] Based on the oil leakage recovery device for the lower-mounted electric cylinder drive system in Example 1, we have designed a new lower-mounted electric cylinder drive system to achieve stable operation during long-term installation, facilitate regular maintenance, and allow for timely shutdown and maintenance of the servo motor in case of problems.

[0037] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak recovery device for a lower-mounted electric cylinder drive system, characterized in that, The lower-mounted electric cylinder drive system includes a ball screw and a servo motor. The servo motor is fixed below the ball screw, and its output axis is fixedly connected to the ball screw. The servo motor is also fixedly connected to a bearing housing. The ball screw is fixed to the bearing housing via a main bearing. A ball screw nut on the ball screw is fixedly connected to the bottom of the inner tube of the electric cylinder. An outer tube of the electric cylinder is provided outside the inner tube. The bottom of the outer tube is fixed to the bearing housing. A lubricating oil pool surrounding part of the ball screw is provided at the bottom of the inner tube. The bottom of the lubricating oil pool is the main bearing and the bearing housing. The outer tube of the electric cylinder surrounds the lubricating oil pool. An oil drain pool is provided below the lubricating oil pool, surrounding part of the ball screw. The bottom of the oil drain pool is an oil seal seat rotatably connected to the ball screw. The upper end of the oil seal seat abuts against the lower end of the bearing housing to form a pool. An oil leakage protection and recovery device is provided below the oil seal seat. The oil leakage recovery device includes an oil leakage receiving unit and a cooling circulation unit. The oil leakage receiving unit is used to receive lubricating oil leaking from the oil drain pool along the ball screw. The cooling circulation unit is used to cool the leaking oil and then transport the cooled leaking oil back to the lubricating oil pool. The oil leakage receiving unit is connected to the cooling circulation unit.

2. The oil leakage recovery device according to claim 1, characterized in that, The outer periphery of the oil seal seat protrudes upwards, and the oil seal seat is fixedly connected to the bearing seat. The protruding end of the outer periphery of the oil seal seat abuts against the lower end face of the bearing seat. The oil drain pool is surrounded by the inner wall of the bearing seat and the inner wall of the oil seal seat, and the top of the oil drain pool is the main bearing.

3. The oil leakage recovery device according to claim 2, characterized in that, A PTFE oil retainer ring is installed on the oil seal seat, and the PTFE oil retainer ring is embedded between the oil seal seat and the ball screw.

4. The oil leakage recovery device according to claim 3, characterized in that, The oil seal seat is also equipped with a skeleton oil seal. The skeleton oil seal is embedded with its opening facing upward between the oil seal seat, the ball screw and the PTFE oil retainer ring. The skeleton oil seal is located below the PTFE oil retainer ring.

5. The oil leakage recovery device according to claim 3, characterized in that, The upper surface of the oil seal seat is provided with a magnetic attraction to attract iron-containing impurities in the lubricating oil.

6. The oil leakage recovery device according to claim 1, characterized in that, The oil leakage receiving unit is located below the oil drain pool. The oil leakage receiving unit includes an oil slinger and an oil receiving pan. The oil slinger is fixed on the ball screw. Lubricating oil leaking downwards along the ball screw drips onto the oil slinger. The oil receiving pan is a hollow disc and is fixed below the oil seal seat. The distance between the oil receiving pan and the lower surface of the oil seal seat is greater than the distance between the oil slinger and the lower surface of the oil seal seat. The distance between the inner periphery of the oil receiving pan and the ball screw is less than the distance between the outer periphery of the oil slinger and the ball screw. Both the outer and inner peripheries of the oil receiving pan protrude upwards. The protruding end of the outer periphery of the oil receiving pan abuts against the lower surface of the oil seal seat. The outer periphery of the oil slinger extends downwards, and the downwardly extending part of the outer periphery of the oil slinger overlaps with the upwardly protruding part of the inner periphery of the oil receiving pan.

7. The oil leakage recovery device according to claim 6, characterized in that, The cooling circulation unit includes an oil return branch pipe, an oil drain main pipe, an oil pump motor, a cooler, and an oil return main pipe. The oil return branch pipe is connected to an oil receiving pan, and an oil return connector is provided on the oil receiving pan for connecting the oil return branch pipe. The oil return branch pipe is connected to the oil drain main pipe, which is connected in sequence to the oil pump motor and the cooler, and is connected to the lubricating oil sump through the oil return main pipe.

8. The oil leakage recovery device according to claim 7, characterized in that, The cooling circulation unit also includes an oil drain branch pipe, a T-joint, and a filter. The oil drain branch pipe is connected to the lubricating oil sump. An oil drain joint is provided at the bottom of the lubricating oil sump to connect to the oil drain branch pipe. The oil drain branch pipe and the return oil branch pipe are connected to the main oil drain pipe through the T-joint. The main oil drain pipe is connected to the oil pump motor after passing through the filter.

9. A bottom-mounted electric cylinder drive system, characterized in that, Includes the oil spill recovery device as described in any one of claims 1-8.

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