Automatic crown block lubricating device for petroleum drilling machine

Abstract

The invention relates to an automatic crown block lubricating device for a petroleum drilling machine, comprising: a power unit comprising a plurality of independently controlled lubricating pumps; the oil way distribution system comprises a plurality of oil containing barrels communicating with oil inlets of the lubricating pumps in a one-to-one correspondence mode, a plurality of lubricating branches communicating with oil outlets of the lubricating pumps and leading to corresponding crown block lubricating points, pressure detection units arranged on the lubricating branches and oil level detection units arranged on the oil containing barrels. The electrical control system comprises a PLC control box and a man-machine interaction interface, and the PLC control box is electrically connected with the multiple lubricating pumps so as to control the lubricating pumps to be started and stopped; the PLC control box is electrically connected with the pressure detection unit and the oil level detection unit so as to receive detection signals of the pressure detection unit and the oil level detection unit. The man-machine interaction interface is in communication connection with the PLC control box and used for setting lubricating parameters and displaying the lubricating state. According to the automatic crown block lubricating device for the petroleum drilling machine, full automation of lubricating of the petroleum drilling crown block is achieved, and operation safety and lubricating reliability are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of lubrication technology for oil drilling and production machinery, and in particular to an automatic lubrication device for overhead cranes used in oil drilling rigs. Background Technology

[0002] As a core component of the drilling rig hoisting system, the operating status of the drilling rig directly affects the safety and efficiency of the entire drilling operation. The rig system typically includes several key lubrication points such as the main pulley, fast-rope pulley, dead-rope pulley, and auxiliary pulleys. Each lubrication point has different requirements for lubrication cycle and oil injection volume due to variations in working conditions, load, and movement. However, currently, manual periodic oil injection is commonly used for lubrication and maintenance of the rig in domestic oil drilling sites, a method with numerous technical drawbacks.

[0003] In existing technologies, operators must climb to a crane approximately 40-50 meters above the drilling platform to lubricate each point individually. This manual operation method is not only labor-intensive and inefficient, but also poses serious safety risks during high-altitude operations, easily leading to falls from heights. Furthermore, because operators struggle to accurately assess the actual needs of each lubrication point, the amount of lubricant injected is often inaccurate, frequently resulting in insufficient or excessive lubrication. This causes premature wear or wasted grease, affecting the normal operation and lifespan of the equipment.

[0004] In summary, the existing lubrication methods for overhead cranes used in oil drilling rigs have significant shortcomings in terms of safety, accuracy, and efficiency. There is an urgent need to develop an automatic lubrication device for overhead cranes used in oil drilling rigs that can achieve remote control, quantitative oil injection, condition monitoring, and fault alarm. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an automatic lubrication device for overhead cranes of oil drilling rigs, which solves the technical problems of safety risks and inaccurate lubrication control and low efficiency caused by manual lubrication.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] This invention provides an automatic lubrication device for overhead cranes used in oil drilling rigs, comprising:

[0010] The power unit includes multiple independently controlled lubrication pumps;

[0011] The oil distribution system includes multiple oil tanks that are connected to the oil inlets of the lubrication pumps one by one, and multiple lubrication branches that are connected to the oil outlets of each lubrication pump and lead to the corresponding overhead crane lubrication points.

[0012] Electrical control system, including PLC control box and human-machine interface;

[0013] The PLC control box is electrically connected to the plurality of lubrication pumps to control their start and stop; the human-machine interface is communicatively connected to the PLC control box and is used to set lubrication parameters.

[0014] Optionally, the oil distribution system further includes a pressure detection unit disposed on each of the lubrication branches and an oil level detection unit disposed on each of the oil tanks;

[0015] The PLC control box is electrically connected to the pressure detection unit and the oil level detection unit to receive their detection signals.

[0016] Optionally, the electrical control system is configured as follows:

[0017] The system receives oil injection parameters, lubrication time and lubrication cycle parameters from the human-machine interface, and controls each lubrication pump to output lubricating grease in a quantitative and periodic manner.

[0018] It receives signals from the pressure detection unit and triggers an alarm and controls the corresponding lubrication pump to stop when the pressure is abnormal;

[0019] It receives signals from the oil level detection unit and triggers an alarm and controls the corresponding lubrication pump to stop when the oil level is too low.

[0020] Optionally, the pressure detection unit includes a pressure sensor and a pressure gauge;

[0021] The pressure sensor is electrically connected to the PLC control box and is used to send a pressure detection signal to the PLC control box. The PLC control box determines whether the pressure detection signal is greater than a first threshold and less than a second threshold.

[0022] If not, the PLC control box sends a pressure abnormality alarm message to the human-machine interface so that the human-machine interface can trigger a pressure abnormality alarm.

[0023] The pressure gauge is installed on the lubrication branch of the overhead crane to display the internal pressure of the branch on-site.

[0024] Optionally, the oil level detection unit is an oil level sensor;

[0025] The oil level sensor is electrically connected to the PLC control box and is used to send an oil level detection signal to the PLC control box. The PLC control box determines whether the oil level detection signal is less than a third threshold.

[0026] If so, the PLC control box sends a low oil level alarm message to the human-machine interface, so that the human-machine interface can trigger a low oil level alarm.

[0027] Optionally, the oil distribution system and the lubrication pump are located at the overhead crane, and the human-machine interface and the PLC control box are located in the driller's cabin or on the drill platform.

[0028] The human-machine interface is configured to remotely display the pressure value, pressure curve, alarm information, and start / stop status of each lubrication branch and each lubrication pump.

[0029] Optionally, the power unit also includes an oil injection pump;

[0030] Each of the multiple oil tanks is equipped with an oil injection valve at its oil inlet, and the oil outlet of the oil injection pump can be selectively connected to each oil injection valve so that the oil injection pump can replenish lubricating grease to each oil tank.

[0031] Optionally, the number of lubrication pumps is four, namely, an auxiliary pulley lubrication pump, a dead rope pulley lubrication pump, a main pulley lubrication pump, and a fast rope pulley lubrication pump;

[0032] The four lubrication pumps correspond to the auxiliary wheel lubrication point, dead rope wheel lubrication point, main pulley lubrication point, and fast rope wheel lubrication point of the overhead crane, respectively.

[0033] Optionally, each of the lubrication branches is also provided with a manual oil injection port at one end near the lubrication point.

[0034] (III) Beneficial Effects

[0035] The beneficial effects of this invention are as follows: The automatic lubrication device for overhead cranes of oil drilling rigs of this invention includes: a power unit comprising multiple independently controlled lubrication pumps; an oil distribution system comprising multiple oil tanks connected to the oil inlets of the lubrication pumps and multiple lubrication branches connected to the oil outlets of each lubrication pump and leading to the corresponding overhead crane lubrication points; and an electrical control system comprising a PLC control box and a human-machine interface; wherein the PLC control box is electrically connected to the multiple lubrication pumps to control their start and stop; and the human-machine interface is communicatively connected to the PLC control box for setting lubrication parameters. Compared to existing manual lubrication methods, this system integrates a power unit, oil distribution system, and electrical control system to achieve fully automated operation of the overhead crane lubrication process, completely eliminating the safety risks associated with manual climbing to high altitudes for oil injection. A PLC control box precisely controls the start and stop of multiple lubrication pumps, ensuring quantitative and timed grease injection, significantly improving lubrication accuracy and operational consistency. The modular design facilitates rapid installation and routine maintenance, while remaining compatible with existing drilling overhead crane mechanical structures, reducing modification costs. Furthermore, the human-machine interface supports remote parameter setting, greatly improving the automation level and overall operational efficiency of drilling operations, effectively solving the technical problems of high safety risks, insufficient accuracy, and low efficiency inherent in traditional manual lubrication methods. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the automatic lubrication device for the overhead crane of the oil drilling rig of the present invention.

[0037] [Explanation of Labels in the Attached Image]

[0038] 1: Lubrication pump; 2: Oil level sensor; 3: Oil tank; 4: Pressure sensor; 5: Pressure gauge; 6: Oil injection pump; 7: PLC control box; 8: Human-machine interface; 9: Power supply; 10: Oil injection valve; 11: Auxiliary wheel lubrication point; 12: Dead rope wheel lubrication point; 13: Main pulley lubrication point; 14: Fast rope wheel lubrication point. Detailed Implementation

[0039] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1:

[0041] Please refer to Figure 1 , Figure 1 A schematic diagram of the automatic lubrication device for the overhead crane of an oil drilling rig according to this embodiment is shown.

[0042] This invention provides an automatic lubrication device for an overhead crane used in oil drilling rigs, comprising a power unit, an oil distribution system, an electrical control system, and a power supply.

[0043] The power unit includes multiple independently controlled lubrication pumps 1.

[0044] The oil distribution system includes multiple oil tanks 3 that are connected one-to-one with the oil inlet of the lubrication pump 1, multiple lubrication branches that are connected to the oil outlet of each lubrication pump 1 and lead to the corresponding overhead crane lubrication point, a pressure detection unit installed on each lubrication branch, and an oil level detection unit installed on each oil tank 3.

[0045] The electrical control system includes a PLC control box 7 and a human-machine interface 8. The PLC control box 7 is electrically connected to multiple lubrication pumps 1 to control their start and stop, and is electrically connected to the pressure detection unit and oil level detection unit to receive detection signals. The human-machine interface 8 is communicatively connected to the PLC control box 7 and is used to set lubrication parameters and display lubrication status. It should be noted that the lubrication parameters include oil injection quantity parameters, lubrication time, and lubrication cycle parameters. The lubrication status includes the pressure value of each lubrication branch, the pressure curve, the start / stop status of each lubrication pump 1, and alarm information. The pressure curve is plotted by the PLC control box 7 with time as the horizontal axis and pressure value as the vertical axis, and is displayed through the human-machine interface 8.

[0046] Power supply 9 is electrically connected to each electrical component to supply power to them.

[0047] In this embodiment, the electrical control system is configured to receive oil injection parameters, lubrication time and lubrication cycle parameters from the human-machine interface 8, and control each lubrication pump 1 to output lubricating grease in a quantitative and periodic manner.

[0048] It receives signals from the pressure detection unit and triggers an alarm and controls the corresponding lubrication pump 1 to stop when the pressure is abnormal;

[0049] It receives signals from the oil level detection unit and triggers an alarm and controls the corresponding lubrication pump 1 to stop when the oil level is too low.

[0050] Preferably, in this embodiment, there are four oil tanks 3: one for the auxiliary wheel, one for the dead rope wheel, one for the main pulley, and one for the fast rope wheel. Similarly, there are four lubrication pumps 1: one for the auxiliary wheel, one for the dead rope wheel, one for the main pulley, and one for the fast rope wheel. The four oil tanks 3 and the four lubrication pumps 1 correspond to the auxiliary wheel lubrication point 11, the dead rope wheel lubrication point 12, the main pulley lubrication point 13, and the fast rope wheel lubrication point 14 of the overhead crane, respectively. However, the number of oil tanks 3 and lubrication pumps 1 is not limited to four; it can also be five, six, seven, or more.

[0051] It should be noted that each lubrication pump 1 is a fixed-displacement plunger pump driven by an electric motor. The amount of oil output by the motor rotating a fixed number of times is pre-calibrated to achieve a quantitative supply. Specifically, the PLC control box 7 can achieve quantitative output of lubricating grease by controlling the number of rotations of the motor of each lubrication pump 1.

[0052] In this embodiment, the power unit also includes a common oil pump 6 for replenishing grease to each individual oil tank 3.

[0053] Each of the oil inlets of multiple oil tanks 3 is equipped with an oil injection valve 10, and the oil outlet of the oil injection pump 6 is selectively connected to each oil injection valve 10 via an oil injection pipeline. The oil injection valve 10 can be an on / off valve; when the oil injection pipeline is connected to the oil injection valve 10, the on / off valve opens the oil inlet of the oil tank 3; when the oil injection pipeline is disconnected from the oil injection valve 10, the on / off valve closes the oil inlet of the oil tank 3. Preferably, the oil injection pump 6 is an air pump, powered by an air source.

[0054] In this embodiment, the oil distribution system and lubrication pump 1 are located at the overhead crane, and the human-machine interface 8 and PLC control box 7 are located in the driller's cabin or on the drill platform. The human-machine interface 8 is configured to remotely display the pressure value, pressure curve, alarm information and start / stop status of each lubrication branch.

[0055] Preferably, the pressure detection unit specifically includes a pressure sensor 4 and a pressure gauge 5. The pressure sensor 4 is electrically connected to the PLC control box 7 and is used to send a pressure detection signal to the PLC control box 7. The PLC control box 7 determines whether the pressure detection signal is greater than a first threshold and less than a second threshold. If not, the PLC control box 7 sends a pressure abnormality alarm message to the human-machine interface 8, causing the human-machine interface 8 to issue a pressure abnormality alarm. For example, if the first threshold is 2 MPa and the second threshold is 10 MPa, if the detected pressure value remains below 2 MPa for one minute or remains above 10 MPa for one minute, the PLC control box 7 will send a pressure abnormality alarm message to the human-machine interface 8.

[0056] Furthermore, pressure gauge 5 is installed on the lubrication branch at the overhead crane to display the internal pressure of the branch. With this configuration, pressure sensor 4 can transmit the pressure signal to the PLC control box 7, allowing operators to observe the pressure values ​​of each lubrication branch from the driller's cabin or drill platform via the human-machine interface 8. Pressure gauge 5 is installed at the overhead crane site, enabling operators to read the pressure values ​​of each lubrication branch from the crane. Therefore, pressure sensor 4 and pressure gauge 5 constitute redundant monitoring; even if pressure sensor 4 completely fails, on-site personnel can still determine the pipeline pressure status using pressure gauge 5.

[0057] In this embodiment, the oil level detection unit is an oil level sensor 2. The oil level sensor 2 is electrically connected to the PLC control box 7 and is used to send an oil level detection signal to the PLC control box 7. The PLC control box 7 determines whether the oil level detection signal is less than a third threshold. If so, the PLC control box 7 sends a low oil level alarm message to the human-machine interface 8, causing the human-machine interface 8 to issue a low oil level alarm. For example, if the third threshold is 1.5L, and the detected oil level is lower than 1.5L, the PLC control box 7 will send a low oil level alarm message to the human-machine interface 8.

[0058] The automatic lubrication device for the overhead crane of the oil drilling rig in this embodiment, due to the above-mentioned structure, has multiple independent monitoring and alarm functions, including abnormal pressure, low oil level, motor failure, etc., which significantly improves the reliability of oil injection operation.

[0059] Furthermore, each lubrication branch is equipped with a manual oil injection port (not shown in the figure) at one end near the lubrication point. It should be noted that the manual oil injection port is retained at the end of each lubrication branch, so that manual lubrication can be switched immediately when the automatic lubrication device of the overhead crane of the oil drilling rig is under maintenance or completely fails, ensuring uninterrupted lubrication. This perfectly matches the characteristic of drilling operations that "cannot be easily stopped".

[0060] In this embodiment, the human-machine interface 8 is preferably a touch screen, located in an easily accessible position within the driller's cabin. The human-machine interface 8 is connected to the PLC control box 7 via a communication cable to enable data interaction.

[0061] The area around the oil drilling rig may leak flammable gases (such as methane) and is therefore an explosion-proof area. Therefore, in this embodiment, the lubrication pump 1, PLC control box 7, human-machine interface 8, pressure sensor 4, and oil level sensor 2 are preferably explosion-proof certified models to fundamentally eliminate ignition sources and meet the most stringent safety regulations for oil drilling sites.

[0062] Due to the harsh environment (high vibration, large temperature differences, explosion-proof requirements), high-risk location (tens of meters above the ground), and serious consequences of lubrication failure, oil drilling rigs require automatic lubrication devices with far more stringent requirements than ordinary equipment. The automatic lubrication device for oil drilling rigs provided in this embodiment is specifically designed for the aforementioned special working conditions and needs of oil drilling rigs. Its main applicability is reflected in: First, it adopts a multi-pump independent control and high protection level design to adapt to the independent needs of multiple lubrication points on the rig and the harsh environment. Second, it is equipped with a redundant monitoring and remote control system, greatly reducing the risks of personnel working at heights and meeting the high safety standards of drilling sites.

[0063] The working process of the automatic lubrication device for the overhead crane of the oil drilling rig in this embodiment is as follows:

[0064] Parameter settings: On the human-machine interface 8 in the driller's cabin, the operator sets the lubrication cycle (e.g., once every 8 hours) and the single oil injection volume (corresponding to the number of motor rotations, e.g., 100 rotations) of the auxiliary pulley, dead rope pulley, main pulley and fast rope pulley according to the lubrication requirements of different pulleys.

[0065] Automatic lubrication: PLC controller 7 automatically starts the lubrication program according to the preset lubrication cycle. For example, when the set time for the main pulley lubrication point 13 is reached, PLC controller 7 will start the corresponding lubrication pump 1 motor, drive it to run a preset number of revolutions, pump out a certain amount of grease from the main pulley oil tank, and finally deliver it to the main pulley lubrication point 13 through the lubrication branch.

[0066] Pressure Monitoring and Protection: During the operation of lubrication pump 1, pressure sensor 4 on this lubrication branch monitors the pipeline pressure in real time and transmits the pressure data to PLC controller 7. PLC controller 7 displays the pressure data on the human-machine interface 8 in the form of numerical values ​​and real-time curves. If the detected pressure is continuously higher than the normal value (which may indicate pipeline blockage) or continuously lower than the normal value (which may indicate pipeline leakage or an empty oil tank), PLC controller 7 will immediately stop the corresponding lubrication pump 1 and trigger an audible and visual alarm on the human-machine interface 8 to prompt the operator to conduct an inspection.

[0067] Oil level monitoring and alarm: The oil level sensor 2 of each oil tank 3 monitors the oil level in real time. When the oil level of any oil tank 3 is lower than the set low threshold, its oil level sensor 2 will send a signal to the PLC controller 7. The PLC controller 7 will then issue a "low grease" alarm on the human-machine interface 8 and prohibit the start of the corresponding lubrication branch until the fault is cleared.

[0068] Manual mode and emergency: If the automatic lubrication device of the oil drilling rig needs maintenance or an emergency occurs, technicians can climb onto the overhead crane and manually lubricate through the manual oil injection ports on each lubrication branch, ensuring the continuity of lubrication operations.

[0069] Centralized monitoring: Drilling personnel can remotely monitor the pressure values, pressure curves, and alarm information of all lubrication branches on the human-machine interface 8 without leaving their posts, which significantly improves work efficiency and safety.

[0070] Example 2:

[0071] This embodiment provides another automatic lubrication device for overhead cranes in oil drilling rigs. Unlike embodiment 1, the PLC controller 7 in this embodiment can be configured for real-time lubrication mode. In this mode, the operator can manually select any one or more lubrication points on the human-machine interface 8 and click the real-time lubrication option. The PLC controller 7 will immediately control the lubrication pump 1 corresponding to the selected lubrication point to run, without being limited by the lubrication cycle or quantitative output. This mode facilitates device debugging or additional maintenance of individual lubrication points under specific operating conditions.

[0072] In this embodiment, the human-machine interface 8 can be an authorized mobile terminal (such as an explosion-proof tablet or smartphone) or any computer connected to the internet. Users can access cloud data via a web browser or a dedicated app to set parameters and monitor status. This allows operators to log in to the cloud management interface from an office far from the well site or at the crane site via a mobile terminal or computer to complete parameter settings for each lubrication point.

[0073] The remaining parts that are the same as in Example 1 will not be repeated here.

[0074] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An automatic lubrication device for an overhead crane used in an oil drilling rig, characterized in that, include: The power unit includes multiple independently controlled lubrication pumps (1); The oil distribution system includes multiple oil tanks (3) that are connected one-to-one with the oil inlet of the lubrication pump (1) and multiple lubrication branches that are connected to the oil outlet of each of the lubrication pumps (1) and lead to the corresponding crane lubrication point. The electrical control system includes a PLC control box (7) and a human-machine interface (8); The PLC control box (7) is electrically connected to the plurality of lubrication pumps (1) to control their start and stop; the human-machine interface (8) is communicatively connected to the PLC control box (7) and is used to set lubrication parameters.

2. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 1, characterized in that: The oil distribution system also includes a pressure detection unit installed on each of the lubrication branches, and an oil level detection unit installed on each of the oil tanks (3); The PLC control box (7) is electrically connected to the pressure detection unit and the oil level detection unit to receive detection signals.

3. The automatic lubrication device for overhead cranes in oil drilling rigs as described in claim 2, characterized in that: The electrical control system is configured as follows: Receive oil injection parameters, lubrication time and lubrication cycle parameters from the human-machine interface (8), and control each lubrication pump (1) to output lubricating grease in a quantitative and periodic manner; Receive the signal from the pressure detection unit, and trigger an alarm and control the corresponding lubrication pump (1) to stop when the pressure is abnormal; The system receives the signal from the oil level detection unit and triggers an alarm and controls the corresponding lubrication pump (1) to stop when the oil level is too low.

4. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 3, characterized in that: The pressure detection unit includes a pressure sensor (4) and a pressure gauge (5); The pressure sensor (4) is electrically connected to the PLC control box (7) and is used to send a pressure detection signal to the PLC control box (7). The PLC control box (7) determines whether the pressure detection signal is greater than a first threshold and less than a second threshold. If not, the PLC control box (7) sends a pressure abnormality alarm message to the human-machine interface (8) so that the human-machine interface (8) can trigger a pressure abnormality alarm. The pressure gauge (5) is installed on the lubrication branch of the overhead crane to display the internal pressure of the branch on site.

5. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 3, characterized in that: The oil level detection unit is an oil level sensor (2); The oil level sensor (2) is electrically connected to the PLC control box (7) and is used to send an oil level detection signal to the PLC control box (7). The PLC control box (7) determines whether the oil level detection signal is less than a third threshold. If so, the PLC control box (7) sends an oil level low alarm message to the human-machine interface (8) so that the human-machine interface (8) can trigger an oil level low alarm. It is configured to trigger a low-level alarm signal when the oil level is lower than the set value.

6. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 3, characterized in that: The oil distribution system and the lubrication pump (1) are located at the overhead crane, and the human-machine interface (8) and the PLC control box (7) are located in the driller's room or on the drilling platform. The human-machine interface (8) is configured to remotely display the pressure value, pressure curve, alarm information and start / stop status of each lubrication branch (1).

7. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 1, characterized in that: The power unit also includes an oil injection pump (6); Each of the multiple oil tanks (3) is equipped with an oil injection valve (10) at its oil inlet. The oil outlet of the oil injection pump (6) is selectively connected to each oil injection valve (10) so that the oil injection pump (6) can replenish grease to each oil tank (3).

8. The automatic lubrication device for overhead cranes of oil drilling rigs as described in claim 1, characterized in that: The number of the lubrication pumps (1) is four, namely, the auxiliary pulley lubrication pump, the dead rope pulley lubrication pump, the main pulley lubrication pump and the fast rope pulley lubrication pump; The four lubrication pumps (1) correspond to the auxiliary wheel lubrication point (11), dead rope wheel lubrication point (12), main pulley lubrication point (13) and fast rope wheel lubrication point (14) of the crane, respectively.

9. The automatic lubrication device for overhead cranes of oil drilling rigs as described in any one of claims 1-8, characterized in that: Each of the aforementioned lubrication branches is also equipped with a manual oil injection port at one end near the lubrication point.

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