A gear box lubrication system for a petroleum drilling rig drawworks

Abstract

The utility model discloses a gear box lubricating system for petroleum drilling rig winch, including the oil tank, install electric heater and first oil product sensor on the oil tank, the oil tank export is connected gear oil pump through inhale filter, gear oil pump oil outlet connects unidirectional valve, main filter and two position four way electromagnetic reversing valve in proper order through lubricating pipeline, one work oil port of two position four way electromagnetic reversing valve is connected air cooler and is led to gear box, and another work oil port is led to gear box directly through bypass pipeline, be equipped with second oil product sensor at gear box oil inlet, be equipped with third oil product sensor and discharge filter cleaner in proper order on gear box oil return pipeline, be equipped with cyclone separation cavity and magnet in discharge filter cleaner, the utility model discloses can automatically maintain lubricating oil suitable temperature, and through multistage filtration and on -line monitoring ensure that oil product is clean and gear box operating state can know, realized from the regular maintenance to the change of predictive maintenance, has improved the reliability and service life of gear box work significantly.

Description

Technical Field

[0001] This utility model relates to the technical field of oil drilling equipment, specifically to a gearbox lubrication system for an oil drilling rig winch. Background Technology

[0002] The gearbox is a key component of the winch transmission system in oil drilling rigs. Its internal gears and bearings operate under high speed, heavy loads, and frequent impact loads, generating significant heat and wear particles. A reliable lubrication system is crucial for ensuring the gearbox's normal operation and extending its service life. Traditional lubrication systems typically only have basic pumping and simple filtration functions, exhibiting significant shortcomings: First, cooling is passive, relying heavily on natural cooling or simple air cooling. In high-temperature environments or under continuous heavy loads, the lubricating oil temperature easily exceeds the allowable range, leading to accelerated oil oxidation, decreased viscosity, and deteriorated lubrication performance. Second, the filtration system is inadequate, usually only a coarse filter is installed before the pump, which is insufficient to effectively filter out fine metal particles generated by gear wear. These hard particles circulating in the oil circuit cause abrasive wear. Third, there is a lack of effective condition monitoring. It is impossible to monitor key quality indicators such as lubricating oil viscosity, water content, and contamination level in real time, nor can it monitor wear particles that reflect the gearbox's health. Maintenance work can only be performed on a fixed schedule, lacking specificity. This can lead to either over-maintenance increasing costs or under-maintenance causing malfunctions.

[0003] Therefore, there is a need to develop an intelligent gearbox lubrication system that can achieve precise control of lubricating oil temperature, has efficient multi-stage filtration capabilities, and can monitor oil condition and equipment wear online in real time. Utility Model Content

[0004] The purpose of this invention is to provide a gearbox lubrication system for oil drilling rig winches. This system can automatically maintain the lubricating oil within the optimal temperature range, ensure oil cleanliness through multi-stage filtration, and monitor oil quality and equipment wear status in real time, thereby achieving predictive maintenance and improving the reliability and service life of the gearbox.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gearbox lubrication system for an oil drilling rig winch, comprising an oil tank, on which a first oil quality sensor for detecting comprehensive indicators of the lubricating oil and an electric heater for heating the lubricating oil are installed; the outlet of the oil tank is connected to a gear oil pump via a suction filter, the gear oil pump being driven by a motor; the outlet of the gear oil pump is connected to a lubrication pipeline, on which a one-way valve is installed, and a safety valve and a main filter are connected in parallel on the pipeline downstream of the one-way valve, the outlet of the safety valve being connected to the oil tank; differential pressure gauges for monitoring the blockage status of the main filter are installed at both ends of the inlet and outlet of the main filter; the outlet of the main filter is connected to the inlet of a two-position four-way solenoid directional valve; one working port of the two-position four-way solenoid directional valve is connected to an air cooler via a pipeline, the air cooler... The outlet of the two-position four-way solenoid directional valve is connected to the oil inlet of the gearbox; the other working oil port of the two-position four-way solenoid directional valve is connected to the oil inlet of the gearbox through a bypass pipeline; a second oil sensor for monitoring the temperature and kinematic viscosity of the lubricating oil is also installed at the oil inlet of the gearbox; the bottom oil outlet of the gearbox is connected to a return oil pipeline, and a third oil sensor for detecting particulate matter in the oil and a discharge filter are installed sequentially along the return oil direction on the return oil pipeline, and the oil outlet of the discharge filter is connected to the oil tank; the discharge filter includes a housing, and a cyclone separation chamber is provided inside the housing, and a magnet is provided at the bottom of the cyclone separation chamber; the system also includes a programmable logic controller, which is electrically connected to the first oil sensor, the second oil sensor, the third oil sensor, the oil pressure sensor, the electric heater and the two-position four-way solenoid directional valve.

[0006] Preferably, the number of gear oil pumps is two, which are connected in parallel and configured with one in use and one on standby.

[0007] Preferably, a venting branch connected to the oil tank via a ball valve is also provided on the pipeline between the parallel node of the one-way valve, the safety valve, and the main filter.

[0008] Preferably, a pressure gauge and an oil pressure sensor are also installed on the outlet pipe of the main filter.

[0009] Preferably, the gearbox is equipped with an oil distributor in front of the oil inlet for distributing lubricating oil to each lubrication point in the gearbox.

[0010] Preferably, the side of the discharge filter housing is provided with an oil inlet pipe assembly and an overflow pipe assembly that communicate with the cyclone separation chamber, the top is provided with a discharge pipe assembly, and the bottom is provided with an oil drain plug.

[0011] Preferably, a temperature gauge for on-site display is installed on the lubrication pipeline near the oil inlet of the gearbox.

[0012] The working process of this utility model is as follows: During system operation, lubricating oil in the tank is drawn into the lubrication pipeline by the gear oil pump through the suction filter. After passing through a check valve, a portion of the oil can be regulated or discharged via a safety valve or ball valve circuit, while the main oil is further purified by the filter. The differential pressure gauge across the filter can display the filter element pressure difference in real time, prompting maintenance.

[0013] The system monitors comprehensive indicators such as oil temperature, viscosity, and water content in the oil tank using a primary oil quality sensor. When the oil temperature is below the set lower limit, the PLC controls the electric heater to start, preheating the oil in the tank to ensure smooth pump startup and effective lubrication. When the oil temperature is above the set upper limit, the PLC controls a two-position four-way solenoid valve to switch directions, allowing the oil to flow through an air cooler for cooling before entering the gearbox. If the oil temperature is within the normal range, the valve is de-energized, and the oil flows directly into the gearbox via a bypass pipeline. This process achieves automatic and precise temperature control of the lubricating oil before it enters the gearbox.

[0014] A second oil sensor installed on the oil line before the gearbox primarily monitors the temperature and viscosity of the incoming oil, ensuring that the oil entering the gearbox meets the required conditions. After lubrication and cooling within the gearbox, the lubricating oil returns via the return line. A third oil sensor installed on the return line focuses on detecting the quantity and size of metal and non-metal particles in the oil, used for online assessment of gear and bearing wear. Subsequently, the oil flows through a discharge filter, which uses centrifugal force to separate and settle particles, while a magnet at the bottom further attracts metal shavings, achieving deep purification of the return oil before it returns to the oil tank.

[0015] The beneficial effects of this utility model are as follows: (1) This utility model combines an electric heater and an air cooler, along with a temperature sensor and PLC control, to ensure that the temperature of the lubricating oil entering the gearbox is always within the optimal range. This avoids low-temperature start-up wear and prevents oil deterioration caused by high temperature, thus significantly improving lubrication efficiency and oil life.

[0016] (2) This utility model is equipped with a three-stage filtration system: suction filtration, main road fine filtration, and return oil cyclone adsorption filtration. In particular, the unique cyclone discharge filter, combined with magnetic adsorption, can efficiently remove especially fine metal wear particles, fundamentally ensuring the cleanliness of the lubricating oil and reducing abrasive wear.

[0017] (3) This utility model achieves full-process, real-time, online monitoring of lubricating oil quality (viscosity, water content, contamination, etc.) and gearbox wear status (particle generation trend) by arranging different types of oil sensors at three key points: the oil tank, the gearbox inlet, and the return port, and combining them with filter differential pressure monitoring. The system can provide early warnings based on monitoring data, changing periodic maintenance to predictive maintenance on demand, effectively avoiding sudden failures, reducing maintenance costs, and extending the overall lifespan of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall principle of the lubrication system described in this utility model; Figure 2 This is a schematic diagram of the internal structure of the discharge filter in this utility model; The components include: 1. Suction filter; 2. Motor; 3. Gear oil pump; 4. Check valve; 5. Safety valve; 6. Pressure gauge; 7. Ball valve; 8. Differential pressure gauge; 9. Oil pressure sensor; 10. Main filter; 11. Two-position four-way solenoid directional valve; 12. Air cooler; 13. Temperature gauge; 14. Second oil quality sensor; 15. Third oil quality sensor; 16. Discharge filter; 16-1. Discharge pipe assembly; 16-2. Inlet pipe assembly; 16-3. Sealing gasket; 16-4. Overflow pipe assembly; 16-5. Magnet; 16-6. Filter screen; 16-7. Base plate; 16-8. Drain plug; 17. Electric heater; 18. First oil quality sensor. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the gearbox lubrication system for oil drilling rig winches provided by this utility model has a first oil quality sensor 18 for comprehensive detection of oil condition and an electric heater 17 for low-temperature heating installed on its oil tank. The outlet of the oil tank is connected to the inlet of the gear oil pump 3 through the suction filter 1, and the gear oil pump 3 is driven by the motor 2. The two gear oil pumps 3 are configured in a one-in-use and one-in-standby manner. The outlet of the gear oil pump 3 is connected to the lubrication pipeline, on which a one-way valve 4, a safety valve 5, and a pressure gauge 6 are installed in sequence. On the pipeline after the one-way valve 4, the oil circuit is divided into three branches: the first branch returns to the oil tank through the ball valve 7 for leakage in special circumstances; the second branch returns to the oil tank through the safety valve 5 for constant pressure overflow; the third branch is the main oil circuit, connected to the filter 10. Differential pressure gauges 8 are installed at the inlet and outlet of the filter 10 to monitor the filter element blockage.

[0021] The outlet of filter 10 is connected to the inlet of a two-position four-way solenoid directional valve 11. The two working ports of this two-position four-way solenoid directional valve 11 are connected to two separate paths: one connects to the inlet of the air cooler 12, with the outlet of the air cooler 12 leading to the gearbox; the other is a bypass line directly connecting to the gearbox. By controlling the on / off state of the directional valve 11, the flow of lubricating oil through the air cooler 12 can be switched.

[0022] A second oil quality sensor 14 is installed near the lubricating oil inlet of the gearbox to monitor the temperature and viscosity of the lubricating oil entering the gearbox. A third oil quality sensor 15 is installed on the return oil line at the bottom of the gearbox to detect particulate matter in the return oil. The return oil then enters the discharge filter 16, where it is filtered and purified before flowing back to the oil tank.

[0023] like Figure 2 As shown, the discharge filter 16 mainly includes a housing, within which a cyclone separation chamber is provided. Lubricating oil enters tangentially from the oil inlet pipe assembly 16-2, generating a cyclone. Particulate matter moves towards the wall and settles under centrifugal force. A magnet 16-5 is provided at the bottom to attract the settled metal particles. Clean oil flows out from the top discharge pipe assembly 16-1, and excess separated oil overflows from the overflow pipe assembly 16-4. An oil drain plug 16-8 is provided at the bottom of the housing for periodically draining deposited dirt.

[0024] The system is automatically controlled by a PLC. The PLC receives signals from the first oil sensor 18, the second oil sensor 14, the third oil sensor 15, as well as the differential pressure gauge 8, the temperature gauge 13, and the oil pressure sensor 9. Based on the oil temperature detected by the first oil sensor 18, the PLC controls the start and stop of the electric heater 17 for low-temperature preheating; and based on this temperature or the inlet oil temperature signal, it controls the action of the two-position four-way solenoid valve 11 to determine whether to activate the air cooler 12. When the differential pressure gauge 8 shows that the pressure difference before and after the filter 10 exceeds the standard, or when any oil sensor detects an abnormal indicator, the PLC will issue an alarm signal to prompt maintenance personnel to check or replace the faulty components.

[0025] Through the above-described structure, this utility model achieves automatic temperature control, multi-stage precision filtration, and online status monitoring of gearbox lubricating oil, effectively improving the reliability of oil drilling rig winch gearbox operation and the level of intelligent maintenance.

[0026] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A gearbox lubrication system for an oil drilling rig winch, characterized in that... The oil tank is equipped with a first oil quality sensor (18) for detecting the comprehensive index of the lubricating oil and an electric heater (17) for heating the lubricating oil. The outlet of the oil tank is connected to a gear oil pump (3) via a suction filter (1), and the gear oil pump (3) is driven by a motor (2). The oil outlet of the gear oil pump (3) is connected to a lubrication pipeline, and a one-way valve (4) is installed on the lubrication pipeline. A safety valve (5) and a main filter (10) are connected in parallel on the pipeline downstream of the one-way valve (4). The outlet of the safety valve (5) is connected to the oil tank. The main filter (10) is equipped with differential pressure gauges (8) at both the inlet and outlet for monitoring its blockage status; the outlet of the main filter (10) is connected to the inlet of a two-position four-way solenoid valve (11); one working port of the two-position four-way solenoid valve (11) is connected to an air cooler (12) via a pipeline, and the outlet of the air cooler (12) is connected to the inlet of the gearbox; the other working port of the two-position four-way solenoid valve (11) is connected to the inlet of the gearbox via a bypass pipeline. A second oil sensor (14) for monitoring the temperature and kinematic viscosity of the lubricating oil is also installed at the oil inlet of the gearbox; the bottom oil outlet of the gearbox is connected to a return oil pipeline, and a third oil sensor (15) for detecting particulate matter in the oil and a discharge filter (16) are installed in sequence along the return oil direction on the return oil pipeline, and the oil outlet of the discharge filter (16) is connected to the oil tank. The discharge filter (16) includes a housing, and a cyclone separation chamber is provided inside the housing. A magnet (16-5) is provided at the bottom of the cyclone separation chamber. The system also includes a programmable logic controller (PLC), which is electrically connected to a first oil sensor (18), a second oil sensor (14), a third oil sensor (15), an oil pressure sensor (9), an electric heater (17), and a two-position four-way solenoid directional valve (11).

2. The gearbox lubrication system for an oil drilling rig winch according to claim 1, characterized in that: The number of gear oil pumps (3) is two, and the two gear oil pumps (3) are connected in parallel and configured as one in use and one on standby.

3. A gearbox lubrication system for an oil drilling rig winch according to claim 1 or 2, characterized in that: On the pipeline between the one-way valve (4) and the safety valve (5) and the main filter (10) in parallel, there is also a drain branch connected to the oil tank via a ball valve (7).

4. The gearbox lubrication system for an oil drilling rig winch according to claim 3, characterized in that: A pressure gauge (6) and an oil pressure sensor (9) are also installed on the outlet pipe of the main filter (10).

5. The gearbox lubrication system for an oil drilling rig winch according to claim 4, characterized in that: The gearbox is equipped with an oil distributor in front of the oil inlet for distributing lubricating oil to various lubrication points within the gearbox.

6. The gearbox lubrication system for an oil drilling rig winch according to claim 5, characterized in that: The discharge filter (16) has an oil inlet pipe assembly (16-2) and an overflow pipe assembly (16-4) connected to the cyclone separation chamber on the side of the housing, a discharge pipe assembly (16-1) at the top, and an oil drain plug (16-8) at the bottom.

7. The gearbox lubrication system for an oil drilling rig winch according to claim 6, characterized in that: A temperature gauge (13) for on-site display is installed on the lubrication pipeline near the oil inlet of the gearbox.

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