Crane lubrication system and lubrication method

Abstract

The present application relates to the technical field of lifting machinery, and specifically provides a crane lubrication system and lubrication method. The present application provides a crane lubrication system, which mainly includes a main pump and a lubrication component, etc. The main pump performs oil pumping operation to various lubrication points of the crane through the lubrication component. A booster pump is installed on the dual-line lubrication main line. The booster pump includes a pump body and pump blades. The booster pump outputs oil to lubricate distant lubrication points, and sensors and other components are arranged inside and outside the pump body to improve the oil pumping effect. Among them, the booster pump can pump out lubricating oil with the same oil pressure as the main pump, so that the hinge part of the trunk bridge can be fully lubricated. The booster pump is set on the original dual-line lubrication main line, and no additional pipeline is required, which reduces the installation cost of this solution.

Description

Technical Field

[0001] The present application relates to the technical field of lifting machinery, and in particular to a crane lubrication system and a lubrication method. Background Art

[0002] Port crane is a variation of bridge crane. In ports, it is mainly used for loading and unloading of outdoor cargo yards, material yards and bulk cargo. Its metal structure is like a portal frame, with two legs installed under the load-bearing main beam, which can walk directly on the ground track, and the two ends of the main beam can have outward cantilever beams. Portal cranes have the characteristics of high site utilization, large operating range, wide adaptability and strong versatility, and are widely used in port cargo yards. The existing single pump lubrication has insufficient lubrication pressure at the far point, resulting in the frequent failure of oiling at the hinge point of the crane's trunk beam.

[0003] In the prior art, lubrication can be achieved by adding a valve or a new oil supply pipeline to control the lubrication condition of a remote point, or by adding a new lubrication pump at the hinge point of the trunk.

[0004] However, the above two solutions not only require manual intervention, but also do not improve the pressure loss of lubricating oil during management. In addition, due to the addition of a lubrication pump, manual maintenance is required on a regular basis, which is not convenient for actual use. Summary of the invention

[0005] In order to solve the problems involved in the above background technology and achieve the purpose of normal lubrication of the crane remote end, the present application provides a crane lubrication system and lubrication method, including a main pump 100 and a lubrication assembly 200. The pump pressure of the main pump 100 is P, which satisfies 30MPa≤P≤50MPa. The main pump 100 performs oil pumping operation to each lubrication point of the crane through the lubrication assembly 200.

[0006] The lubrication assembly 200 includes a dual-line lubrication main line, a dual-line distributor, and a dual-line lubrication branch line. The inner diameters of the dual-line lubrication main line and the dual-line lubrication branch line are both R, satisfying 10mm≤R≤12mm. The dual-line distributor is installed at the output end of each dual-line lubrication branch line. A booster pump 300 is installed on the dual-line lubrication main line. The distance between the booster pump 300 and the main pump 100 is L, satisfying 20≤L≤40mm. The booster pump 300 outputs oil to lubricate a distant lubrication point.

[0007] With such a configuration, the crane provided in the embodiment of the present application is a port crane. The lubrication pump, i.e., the main pump, of the crane is usually installed in the herringbone frame on the turntable plane. The distance from the main pump to the hinge point of the trunk beam is more than meters. When the main pump pumps oil to the hinge point of the trunk beam, other branch pipelines cannot be completely sealed, so there will be oil leakage during the oil transportation process. Therefore, the main pump needs to provide greater power and oil volume. On the one hand, the waste of lubricating oil is more serious due to the oil leakage, and on the other hand, the pressure loss of the power pipeline will be further increased due to the provision of a larger power pipeline. Therefore, in the embodiment of the present application, a booster pump is added to the dual-line main lubrication pipeline, so that the booster pump can pump out lubricating oil with the same oil pressure as the main pump, so that the hinge part of the trunk beam can be fully lubricated, and because the booster pump is arranged on the original dual-line lubrication main pipeline, no additional pipeline is required, which reduces the installation cost of this solution.

[0008] It should be additionally explained that the crane provided in the embodiment of the present application uses a dual-line lubrication system. In the dual-line lubrication pipeline, one pipeline is pressurized by the main pump to deliver new lubricating oil, and the other pipeline returns the unused lubricating oil to the oil tank. This can achieve frequent lubrication of various lubrication points, reduce the downtime of the crane, and improve work efficiency.

[0009] According to an implementation method provided in an embodiment of the present application, the booster pump includes a pump body and pump blades. The pump blades are spirally installed on one side of the pump body close to the output end, and a motor is provided on the side of the pump body to control the operation of the pump blades.

[0010] According to an implementation method provided in an embodiment of the present application, at least two solenoid control valves are installed on the dual-line lubrication main line near the booster pump input port to control the pump body to perform oil pumping operations, and a flow sensor is connected to the output end of the booster pump to control the output oil volume.

[0011] In this way, the electromagnetic control valve is installed on the two pipelines of the dual-line lubrication main line. When the main pump is turned on, the crane is lubricated. The dual-line lubrication main line supplies oil to the oil storage barrel in the pump body of the booster pump. At this time, the electromagnetic control valve is in the open state. When the oil in the oil storage barrel rises to the full load level, the electromagnetic control valve is closed, and the motor on one side of the booster pump drives the pump blade to work to oil the hinge point of the trunk beam; when the oil in the oil storage barrel drops to the no-load position, the motor on one side of the booster pump stops working, the electromagnetic control valve opens, and the main pump re-supplies oil to the oil storage barrel in the pump body. The operation of fully automatic refueling and oil supply is realized. Since the amount of oil cannot be accurately counted in the actual working process, a flow sensor is configured at the output end of the booster pump, and a CMS system is set to count the flow through the flow sensor to control the start and stop of the main pump and the booster pump, and to achieve the operation of accurately oiling each lubrication point.

[0012] According to an implementation method provided in an embodiment of the present application, a pair of liquid level sensors are arranged in the pump body, and the liquid level sensors are respectively arranged at the full load position and the no-load position of the pump body, and a pressure sensor may also be arranged at the bottom of the pump body.

[0013] With such a configuration, the pump body can be equipped with a liquid level sensor to feedback the current position information of the oil in the oil storage barrel. It can also be equipped with a pressure sensor at the bottom of the pump body. That is, by setting the weight of the empty and fully loaded oil barrels in the pump body, the current amount of oil in the oil barrels in the pump body can be judged, thereby controlling the switching of the electromagnetic control valve, thereby improving the coverage of automation and eliminating the need for additional manual intervention.

[0014] According to an implementation method provided in an embodiment of the present application, the distance from the booster pump to the main pump is H1, and the distance from the booster pump to the farthest end of the crane is H2, satisfying: H1, H2≤30m.

[0015] With such an arrangement, the pump pressure provided by the main pump provided in the embodiment of the present application will gradually decrease after exceeding 30m. Therefore, it is necessary to control the distance from the booster pump to the main pump and the distance from the booster pump to the farthest end of the hinge of the elephant trunk bridge within 30m, so that the booster pump can pump out lubricating oil with a pressure of 40MPa, which is the same as the main pump, to ensure that the remote lubrication point can output oil normally.

[0016] According to an implementation method provided in an embodiment of the present application, it also includes a boom hinge point and a trunk hinge point. The boom hinge point is located in the middle of the dual-line lubrication main line, and the trunk hinge point is arranged at one end of the dual-line lubrication main line away from the main pump.

[0017] According to an implementation method provided in an embodiment of the present application, both the boom hinge point and the trunk hinge point are connected to the double-line lubrication main line through a double-line lubrication branch line.

[0018] With such an arrangement, the crane provided in the embodiment of the present application has a total of lubrication points, wherein the trunk hinge is 30,950 mm away from the main pump, and the booster pump is arranged on the double-line lubrication main line not far before the trunk hinge. On the one hand, it can maximize the coverage of the main pump, and on the other hand, the booster pump is arranged on the lubrication main line, so that the main pump preferentially provides oil to the booster pump on the lubrication main line. In this way, in the process of supplying oil to the booster pump, the output of oil to other branch lines is reduced. Due to the existence of oil leakage, the pressure loss of the lubricating oil in the pipeline is also reduced, thereby reducing the waste of lubricating oil and providing stable oil output operation for the trunk hinge and subsequent parts.

[0019] According to an implementation method provided in an embodiment of the present application, the end of the dual-line lubrication main pipeline is connected to a plurality of elephant trunk bridge roller bearings via a dual-line lubrication branch pipeline.

[0020] According to an implementation method provided in an embodiment of the present application, a booster pump is arranged on a double-line lubrication main line between the hinge point of the trunk beam and the hinge point of the boom to achieve oiling of the hinge point of the trunk beam at the far end of the crane.

[0021] With such arrangement, in the embodiment of the present application, the trunk bridge also includes a roller skating part of the trunk bridge, which is also provided with lubrication points, namely, a lubrication point at the head of the trunk bridge and a lubrication point at the tail of the trunk bridge, wherein the lubrication point at the head of the trunk bridge is 44450 mm away from the main pump and the lubrication point at the tail of the trunk bridge is 35300 mm away from the main pump, and the two lubrication points are also connected to the terminal of the double-line lubrication main line through a double-line lubrication branch line, and oil is pumped to the two lubrication points through a booster pump.

[0022] According to an implementation manner provided in an embodiment of the present application, the present application also provides a lubrication method for a crane, which is applicable to the lubrication system of the crane provided in an embodiment of the present application, and the use method includes: the electromagnetic control valve is opened, and the booster pump motor stops working; the main pump preferentially supplies oil to the booster pump, and the oil reaches the full load position, the electromagnetic control valve is closed, and the booster pump motor starts working; the main pump stops supplying oil to the booster pump, and the booster pump performs an oiling operation to a remote lubrication point, and the oil in the booster pump reaches the no-load position, the electromagnetic control valve is opened, and the booster pump motor stops working.

[0023] In this way, in the embodiment of the present application, a booster pump is provided to supply oil to the lubrication point at the remote end. Compared with the solution of adding an additional pump station, the cost of this solution is lower. The booster pump in the embodiment of the present application automatically supplies oil through the main pump, and there is no need to manually climb to multiple distant stations for refueling.

[0024] By installing a booster pump, the main pump can be placed closer to the ground to facilitate staff to carry out daily maintenance, oiling and other operations.

[0025] The present application provides a crane lubrication system, which mainly includes a main pump and a lubrication component. The main pump performs oil pumping operation to various lubrication points of the crane through the lubrication component. A booster pump is installed on the dual-line lubrication main line. The booster pump includes a pump body and pump blades. The booster pump outputs oil to pump oil to a remote lubrication point, and sensors and other components are arranged inside and outside the pump body to improve the oil pumping effect.

[0026] The original intention of the design of this application is that when the main pump pumps oil to the hinge of the trunk beam, other branch pipelines cannot be completely sealed, so there will be oil leakage during the oil delivery process. Therefore, the main pump needs to provide greater power and oil volume. The waste of lubricating oil due to oil leakage is more serious, and the pressure loss of the pipeline will be further increased due to the provision of a larger power. The booster pump can pump out lubricating oil with the same oil pressure as the main pump, so that the hinge part of the trunk beam can be fully lubricated. The booster pump is set on the original dual-line lubrication main pipeline, and no additional pipeline is required, which reduces the installation cost of this solution. In addition, in the dual-line lubrication pipeline, one pipeline is pressurized by the main pump to transport new lubricating oil, and the other pipeline returns the unused lubricating oil to the oil tank, which can achieve frequent lubrication of various lubrication points, reduce the downtime of the crane, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A schematic diagram of the structure of a crane lubrication system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a structure in which a liquid level sensor is provided for a booster pump provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a booster pump provided in an embodiment of the present application with a pressure sensor.

[0031] Description of reference numerals:

[0032] 100-main pump; 200-lubrication assembly; 300-boosting pump; 310-pump body; 320-pump blades; 330-motor; 340-electromagnetic control valve; 350-liquid level sensor; 360-pressure sensor; 400-arm hinge point; 500-trunk hinge point.

[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0036] Secondly, it should be noted that in the description of the present application, terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0037] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] Port crane is a variation of bridge crane. In ports, it is mainly used for loading and unloading of outdoor cargo yards, material yards and bulk cargo. Its metal structure is like a portal frame, with two legs installed under the load-bearing main beam, which can walk directly on the ground track, and the two ends of the main beam can have outward cantilever beams. Portal cranes have the characteristics of high site utilization, large operating range, wide adaptability and strong versatility, and are widely used in port cargo yards. The existing single pump lubrication has insufficient lubrication pressure at the far point, resulting in the frequent failure of oiling at the hinge point of the crane's trunk beam.

[0040] In the prior art, lubrication can be achieved by adding a valve or a new oil supply pipeline to control the lubrication condition of a remote point, or by adding a new lubrication pump at the hinge point of the trunk.

[0041] However, the above two solutions not only require manual intervention, but also do not improve the pressure loss of lubricating oil during management. In addition, due to the addition of a lubrication pump, manual maintenance is required on a regular basis, which is not convenient for actual use.

[0042] Figure 1 A schematic diagram of the structure of a crane lubrication system provided in an embodiment of the present application; Figure 2 A schematic diagram of a structure in which a liquid level sensor is provided for a booster pump provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a booster pump provided in an embodiment of the present application with a pressure sensor.

[0043] Reference Figure 1 , Figure 2 , Figure 3 As shown, the present application provides a crane lubrication system and lubrication method, including a main pump 100 and a lubrication assembly 200. The pump pressure of the main pump 100 is P, which satisfies 30MPa≤P≤50MPa. The main pump 100 performs oiling operation to each lubrication point of the crane through the lubrication assembly 200.

[0044] The lubrication assembly 200 includes a dual-line lubrication main line, a dual-line distributor, and a dual-line lubrication branch line. The inner diameters of the dual-line lubrication main line and the dual-line lubrication branch line are both R, satisfying 10mm≤R≤12mm. The dual-line distributor is installed at the output end of each dual-line lubrication branch line. A booster pump 300 is installed on the dual-line lubrication main line. The distance between the booster pump 300 and the main pump 100 is L, satisfying 20≤L≤40mm. The booster pump 300 outputs oil to lubricate a distant lubrication point.

[0045] It should be noted that the crane provided in the embodiment of the present application is a port crane. The lubrication pump of the crane, i.e., the main pump 100, is usually installed in the herringbone frame on the turntable plane. The distance between the main pump 100 and the hinge point 500 of the elephant's trunk is more than 30 meters. When the main pump 100 pumps oil to the hinge point 500 of the elephant's trunk, since other branch pipelines cannot be completely sealed, there will be oil leakage during the oil transportation process. Therefore, the main pump 100 needs to provide greater power and oil volume. On the one hand, the waste of lubricating oil is more serious due to the existence of oil leakage. On the other hand, the pressure loss of the power pipeline will be further increased due to the provision of a larger power pipeline. Therefore, in the embodiment of the present application, a booster pump 300 is added to the dual-line main lubrication pipeline, so that the booster pump 300 can pump out lubricating oil with the same oil pressure as the main pump 100, so that the hinge point 500 of the elephant's trunk can be fully lubricated, and since the booster pump 300 is arranged on the original dual-line lubrication main pipeline, no additional pipeline is required, which reduces the installation cost of this solution.

[0046] In addition, it should be noted that the crane provided in the embodiment of the present application uses a dual-line lubrication system. In the dual-line lubrication pipeline, one pipeline is pressurized by the main pump 100 to deliver new lubricating oil, and the other pipeline returns the unused lubricating oil to the oil tank, which can achieve frequent lubrication of various lubrication points, reduce the downtime of the crane, and improve work efficiency.

[0047] According to an implementation scheme provided in an embodiment of the present application, the boost pump 300 includes a pump body 310 and a pump blade 320. The pump blade 320 is spirally installed on one side of the pump body 310 close to the output end. A motor 330 is provided on the side of the pump body 310 to control the operation of the pump blade 320.

[0048] According to an implementation method provided in an embodiment of the present application, at least two solenoid control valves 340 are installed on the dual-line lubrication main line near the input port of the boost pump 300 to control the pump body 310 to perform oil pumping operation, and the output end of the boost pump 300 is connected to a flow sensor to control the output oil volume.

[0049] It should be noted that in the implementation method provided in the embodiment of the present application, since the amount of oil pumped cannot be accurately counted during the actual working process, a flow sensor is configured at the output end of the boost pump 300, and a CMS system is set to count the flow through the flow sensor to control the start and stop of the main pump 100 and the boost pump 300, thereby achieving the operation of accurately oiling each lubrication point.

[0050] Furthermore, the control system can also record and set the working time of the boost pump 300, further improving the controllability of the entire lubrication system.

[0051] It should also be noted that the electromagnetic control valve 340 is respectively installed on the two pipelines of the dual-line lubrication main line. When the main pump 100 is turned on, the crane is lubricated. The dual-line lubrication main line supplies oil to the oil storage barrel in the pump body 310 of the booster pump 300. At this time, the electromagnetic control valve 340 is in the open state. When the oil volume in the oil storage barrel rises to the full load level, the electromagnetic control valve 340 is closed, and the motor 330 on one side of the booster pump 300 drives the pump blade 320 to work and pump oil at the hinge point 500 of the trunk bridge; when the oil volume in the oil storage barrel drops to the no-load position, the motor 330 on one side of the booster pump 300 stops working, the electromagnetic control valve 340 is opened, and the main pump 100 supplies oil to the oil storage barrel in the pump body 310 again. The operation of fully automatic refueling and oil supply is realized.

[0052] According to an implementation scheme provided in an embodiment of the present application, a pair of liquid level sensors 350 are disposed in the pump body 310 , and the liquid level sensors 350 are respectively disposed at the full load position and the no-load position of the pump body 310 . A pressure sensor 360 may also be disposed at the bottom of the pump body 310 .

[0053] It should be noted that in an implementation manner provided in an embodiment of the present application, the position information of the oil in the current oil storage barrel can be fed back by setting a liquid level sensor 350 inside the pump body 310, or a pressure sensor 360 can be set at the bottom of the pump body 310, that is, by setting the empty and fully loaded weights of the oil barrels in the pump body 310 to determine the current oil volume in the oil barrels in the pump body 310, so as to control the switch of the electromagnetic control valve 340, thereby improving the coverage of automation and eliminating the need for additional manual intervention.

[0054] In addition, the present application may also install other types of contact or non-contact sensors, and the detection means of the sensor may also be detected by sound waves, light, etc., which is not specifically limited in the present application.

[0055] According to an implementation method provided in an embodiment of the present application, the distance from the booster pump 300 to the main pump 100 is H1, and the distance from the booster pump 300 to the farthest end of the crane is H2, satisfying: H1, H2≤30m.

[0056] It should be noted that the main pump 100 provided in the embodiment of the present application provides a pump pressure that gradually decreases after exceeding 30m. Therefore, it is necessary to control the distance from the booster pump 300 to the main pump 100 and the distance from the booster pump 300 to the farthest end of the elephant trunk hinge 500 within 30m, so that the booster pump 300 can pump out lubricating oil with a pressure of 40MPa, which is the same as that of the main pump 100, to ensure that the remote lubrication point can pump out oil normally.

[0057] According to an implementation method provided in an embodiment of the present application, it also includes a boom hinge point 400 and a trunk hinge point 500. The boom hinge point 400 is located in the middle of the dual-line lubrication main line, and the trunk hinge point 500 is arranged at one end of the dual-line lubrication main line away from the main pump 100.

[0058] According to an implementation method provided in an embodiment of the present application, the boom hinge 400 and the trunk hinge 500 are both connected to the double-line lubrication main line through a double-line lubrication branch line.

[0059] It should be noted that the crane provided in the embodiment of the present application has a total of 86 lubrication points, among which the trunk hinge 500 is 30950 mm away from the main pump 100. The booster pump 300 is arranged on the double-line lubrication main line not far before the trunk hinge 500. On the one hand, it can maximize the coverage of the main pump 100. On the other hand, the booster pump 300 is arranged on the lubrication main line, so that the main pump 100 gives priority to providing oil to the booster pump 300 on the lubrication main line. In this way, in the process of supplying oil to the booster pump 300, the output of oil to other branch pipelines is reduced. Due to the existence of oil leakage, the pressure loss of the lubricating oil in the pipeline is also reduced, thereby reducing the waste of lubricating oil and providing stable oil output operation for the trunk hinge 500 and subsequent parts.

[0060] According to an implementation method provided in an embodiment of the present application, the end of the dual-line lubrication main pipeline is connected to a plurality of elephant trunk bridge roller bearings via a dual-line lubrication branch pipeline.

[0061] According to an implementation method provided in an embodiment of the present application, the booster pump 300 is disposed on a double-line lubrication main line between the trunk hinge 500 and the boom hinge 400 to achieve lubrication of the trunk hinge 500 at the far end of the crane.

[0062] It should be noted that in the embodiment of the present application, the trunk bridge also includes a roller skating part of the trunk bridge, which is also provided with lubrication points, namely the lubrication point at the head of the trunk bridge and the lubrication point at the tail of the trunk bridge. The lubrication point at the head of the trunk bridge is 44450 mm away from the main pump 100 and the lubrication point at the tail of the trunk bridge is 35300 mm away from the main pump 100. The two lubrication points are also connected to the terminal of the double-line lubrication main line through a double-line lubrication branch line, and oil is pumped to the two lubrication points through a booster pump 300.

[0063] According to an embodiment of the present application, the present application also provides a lubrication method for a crane, which is applicable to the lubrication system of the crane provided in the embodiment of the present application, and the method of use includes: the electromagnetic control valve is opened, and the booster pump 300 motor 330 stops working; the main pump 100 preferentially supplies oil to the booster pump 300, and the oil reaches the full load position, the electromagnetic control valve 340 is closed, and the booster pump 300 motor 330 starts working; the main pump 100 stops supplying oil to the booster pump 300, and the booster pump 300 performs an oiling operation to a remote lubrication point, and the oil in the booster pump 300 reaches the no-load position, the electromagnetic control valve 340 is opened, and the booster pump 300 motor 330 stops working.

[0064] It should be noted that, in the embodiment of the present application, the booster pump 300 is provided to oil the remote lubrication point, and the cost of this solution is lower than that of adding an additional pump station. The booster pump 300 in the embodiment of the present application automatically supplies oil through the main pump 100, and there is no need to manually climb to multiple distant stations for refueling.

[0065] By providing the booster pump 300, the main pump 100 can be arranged at a position closer to the ground, so as to facilitate the staff to perform daily maintenance, oiling and other operations.

[0066] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0067] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A crane lubrication system, characterized in that: The invention comprises a main pump (100) and a lubrication assembly (200), wherein the pump pressure of the main pump (100) is P, which satisfies 30MPa≤P≤50MPa, and the main pump (100) performs an oiling operation on various lubrication points of the crane through the lubrication assembly (200). The lubrication assembly (200) comprises a dual-line lubrication main pipeline, a dual-line distributor, and a dual-line lubrication branch pipeline. The dual-line lubrication main pipeline and the dual-line lubrication branch pipeline have an inner diameter of R, satisfying 10 mm ≤ R ≤ 12 mm. The dual-line distributor is installed at the output end of each dual-line lubrication branch pipeline. A booster pump (300) is installed on the dual-line lubrication main pipeline. The distance between the booster pump (300) and the main pump (100) is L, satisfying 20 ≤ L ≤ 40 mm. The booster pump (300) outputs oil to pump oil to a distant lubrication point.

2. A crane lubrication system according to claim 1, characterized in that: The booster pump (300) comprises a pump body (310) and a pump blade (320); the pump blade (320) is spirally mounted on one side of the pump body (310) close to the output end; a motor (330) is arranged on the side of the pump body (310) to control the operation of the pump blade (320).

3. A crane lubrication system according to claim 2, characterized in that: At least two electromagnetic control valves (340) are installed on the dual-line lubrication main line near the input port of the booster pump (300) to control the pump body (310) to perform oil pumping operations, and a flow sensor is connected to the output end of the booster pump (300) to control the output oil volume.

4. A crane lubrication system according to claim 2, characterized in that: A pair of liquid level sensors (350) are disposed in the pump body (310), and the liquid level sensors (350) are respectively disposed at a full load position and an empty load position of the pump body (310). And / or, a pressure sensor (360) is disposed at the bottom of the pump body (310).

5. A crane lubrication system according to claim 1, characterized in that: The distance between the booster pump (300) and the main pump (100) is H1, and the distance between the booster pump (300) and the farthest end of the crane is H2, satisfying: H1, H2≤30m.

6. A crane lubrication system according to claim 1, characterized in that: It also includes an arm hinge point (400) and a trunk hinge point (500), wherein the arm hinge point (400) is located in the middle of the dual-line lubrication main line, and the trunk hinge point (500) is arranged at one end of the dual-line lubrication main line away from the main pump (100).

7. A crane lubrication system according to claim 6, characterized in that: The arm hinge point (400) and the trunk hinge point (500) are both connected to the double-line lubrication main line via a double-line lubrication branch line.

8. A crane lubrication system according to claim 6, characterized in that: The end of the dual-line lubrication main pipeline is connected to a plurality of elephant-trunk bridge roller bearings via dual-line lubrication branch pipelines.

9. A crane lubrication system according to claim 6, characterized in that: The booster pump (300) is arranged on the double-line lubrication main line between the trunk hinge (500) and the boom hinge (400) to achieve lubrication of the trunk hinge (500) at the far end of the crane.

10. A crane lubrication method, applicable to a crane lubrication system according to any one of claims 1 to 9, the method comprising: S1, the electromagnetic control valve opens and the booster pump motor stops working; S2, the main pump first delivers oil to the booster pump, the oil reaches the full load position, and the electromagnetic control valve closes. The booster pump motor starts working; S3, the main pump stops delivering oil to the booster pump, the booster pump pumps oil to the remote lubrication point, the oil in the booster pump reaches the no-load position, the solenoid control valve opens, and the booster pump motor stops working.

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