A dual-line centralized lubrication system

Abstract

The present invention relates to a dual-line centralized lubrication system. It includes a dual-line lubrication pump or a dual-plunger lubrication pump, a main oil circuit, a dual-line distributor and a progressive distributor. The dual-line distributor is connected to two main oil circuits, and the progressive distributor is also connected to the main oil circuit. During operation, the amount of grease output by the progressive distributor is determined by the operating time set by the controller. The system has a simple structure, the distributor size is easy to standardize and is relatively small, it can be applied to the lubrication of lubrication points with different oil requirements without replacing the distributor, it is convenient to increase or decrease the number of lubrication points, it has strong expandability, it is convenient to perform fault detection, it is convenient to set an adaptive lubrication mode according to the different working modes of the equipment, and each lubrication point can be zoned and controlled. When the oil demand of the lubrication points in each area changes and the grease supply is adjusted, there is no interference with each other. The working time of the progressive distributors connected on the two main oil circuits can be different to achieve different displacement requirements, and the amount of lubricating oil can be dynamically adjusted when the working conditions change.

Description

Technical Field

[0001] The invention relates to a dual-line centralized lubrication system. Background Art

[0002] Construction machinery is the main machinery for various infrastructure projects such as urban and rural construction, railways, highways, ports and terminals, farmland water conservancy, electricity, metallurgy, and mining. Since 2016, the construction machinery industry has entered a stage of rapid development, with an annual increase of nearly 1.2 million units. As of 2020, the market share is about 9 million units, of which about 2 million are excavators.

[0003] Construction machinery works in high temperature, high humidity, high dust, strong vibration and high load environment for a long time. The friction between its moving parts is relatively serious. If the heavy-loaded friction pairs are not lubricated regularly, the wear rate between the friction pairs will increase geometrically, resulting in a significant increase in the equipment failure rate and seriously affecting the normal operation of the equipment. Therefore, regular grease filling is required.

[0004] Traditional lubrication methods generally include two: manual lubrication, which involves adding grease to the lubrication points through grease fittings on the friction pair. However, this method requires downtime and is laborious due to the numerous lubrication points, delaying the construction process. Furthermore, due to inconsistent personnel quality, untimely or over-lubrication is common, which is also detrimental to the friction pair. This time-consuming and labor-intensive method has seriously impacted the efficiency of construction machinery. With the recent increase in labor costs, the younger age of drivers, and the development of automated construction machinery, the drawbacks of manual lubrication have become even more prominent.

[0005] Another approach is to install a centralized lubrication system on construction machinery. This system distributes grease from a centralized lubricating oil source through pipelines connected to oil distributors and metering devices, accurately distributing grease to multiple lubrication points according to a specific schedule (cycle and volume). A centralized lubrication system typically includes a lubrication pump, distributor, and lubrication piping. The lubrication pump incorporates an integrated motor, plunger assembly, oil tank, and monitor. The monitor controls the motor's start and stop, ensuring that the pump delivers grease to each lubrication point at a predetermined time, location, and quantity.

[0006] Existing commonly used centralized lubrication systems include progressive centralized lubrication systems and single-line centralized lubrication systems.

[0007] Progressive centralized lubrication system: The distributors at each level are connected in sequence through the lubrication pump. When the progressive distributor is working, the grease of each plunger metering part is delivered to each lubrication point in sequence. The progressive distributor acts in sequence through each plunger to supply grease to the lubrication points one by one in a progressive manner.

[0008] Single-line centralized lubrication system: The piston in the single-line distributor measures the grease with a fixed displacement. When working, the grease is delivered to each lubrication point almost simultaneously. In the single-line centralized lubrication system, the grease in the pipeline must be naturally unloaded and flow back to the lubrication pump to complete the grease injection process. The single-line distributor has the characteristic of cyclical operation. Each cycle is divided into a grease supply process to the lubrication point and a grease unloading and return process to the lubrication pump.

[0009] The existing centralized lubrication systems, whether single-line, progressive or dual-line, cannot meet customer needs well and have the following problems:

[0010] Lubrication cannot be zoned to different parts based on operating conditions or attachments. Construction machinery's operating conditions change frequently and significantly during use, necessitating dynamic adjustments to the lubrication requirements of different parts of the machinery. Furthermore, for construction machinery like excavators and loaders, different attachments are frequently changed during operation depending on the workload. For example, excavators use buckets for digging and hammers for crushing. When using a bucket, the boom and connecting rods frequently move, resulting in significant variations in lubrication requirements across the entire machine. When using a hammer, the boom and connecting rods move less frequently, resulting in smaller variations in lubrication requirements. However, existing lubrication systems operate all lubrication points simultaneously, and the oil distribution ratio is determined by the movement of a plunger within the distributor. Once set, this ratio cannot be altered, making it incapable of adapting to the wide variations in lubrication requirements caused by attachment changes. In other words, the unadjustable lubrication distribution ratio in existing centralized lubrication systems results in varying degrees of lubrication deficiencies across all lubrication points. Excavators are multi-purpose machines with frequently changing attachments, making existing centralized lubrication systems incapable of adapting to all operating conditions. This greatly limits the promotion and application of centralized lubrication systems. In fact, the installation rate of centralized lubrication systems on existing excavators is less than 1%, which has huge market potential.

[0011] It is not scalable and cannot lubricate later-installed accessories. The normal operation of existing progressive lubrication systems is based on the normal operation of the progressive distributor. The multiple plungers inside the progressive distributor operate in a fixed sequence without stopping. This also results in the progressive system having no reserved lubrication points and cannot lubricate later-installed accessories.

[0012] Therefore, when lubricating construction machinery and other mechanical equipment with different oil requirements, there is an urgent need for a centralized lubrication system that can achieve a large-scale and flexible adjustment of the lubrication amount during use, can achieve zoned lubrication of different parts, has a higher degree of standardization, and can dynamically adjust the lubricating oil amount when the working conditions change. Summary of the Invention

[0013] The purpose of the present invention is to provide a dual-line centralized lubrication system, which can realize flexible adjustment of the lubrication amount to a large extent during use through zoning control, realize zoned lubrication of different parts, have a higher degree of standardization, and dynamically adjust the amount of lubricating oil when the working conditions change.

[0014] The technical solution of the present invention is as follows: The dual-line centralized lubrication system includes:

[0015] A dual-line lubrication pump for pumping grease includes a pumping mechanism, a reversing valve mechanism, and a controller; the pumping mechanism has a grease inlet for sucking grease and a grease outlet for discharging grease; the reversing valve mechanism includes a reversing module and a reversing valve, the reversing valve including at least four oil ports, including a grease inlet connected to the grease outlet, a grease return port for connecting to a grease storage container, and first and second external grease ports; the reversing valve is controlled by the reversing module so that when grease is discharged from the first external grease port and grease is returned from the second external grease port, the first external grease port is connected to the grease inlet, and the second external grease port is connected to the grease return port; when grease is returned from the first external grease port and grease is discharged from the second external grease port, the first external grease port is connected to the grease return port, and the second external grease port is connected to the grease inlet;

[0016] The main oil circuit includes oil circuits A and B, which are connected to the first and second external grease ports respectively;

[0017] There is at least one dual-line distributor having two first inlets and multiple first outlets, wherein the two first inlets are respectively connected to the two main oil circuits, and the multiple first outlets are respectively used to connect to the lubrication points in a certain area of ​​the equipment, or at least one of the multiple first outlets is used to connect to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets are used to connect to other lubrication points;

[0018] There is one or two progressive distributors, each having a second inlet and multiple second outlets for communicating with lubrication points in another area of ​​the equipment. When there is only one progressive distributor, it is connected to one of the A and B oil circuits through the second inlet; when there are two progressive distributors, each is connected to the A and B oil circuits through its own second inlet;

[0019] A safety protection module is provided on the oil line between the grease outlet and the grease inlet or on the A and B oil lines to protect the system from pressure exceeding the maximum safety pressure;

[0020] During operation, the amount of grease output by the progressive distributor is determined by the operating time set by the controller.

[0021] Alternatively, another dual-line centralized lubrication system includes:

[0022] A double-plunger lubrication pump for pumping grease comprises a pumping mechanism, a reversing valve mechanism and a controller; the pumping mechanism comprises at least two plunger pairs, each plunger pair having a grease inlet for sucking grease and a grease outlet for discharging grease; there are two reversing valve mechanisms, each of which comprises a reversing module and a three-way reversing valve, the three-way reversing valve comprising a grease inlet, a grease return port for connecting to a grease storage container and an external grease port, the grease inlet of one three-way reversing valve being connected to the grease outlet of at least one plunger pair, and the grease inlet of the other three-way reversing valve being connected to the grease outlet of at least one of the remaining plunger pairs; under the control of the two reversing modules: when one reversing valve mechanism is in a state of connection between the grease inlet and the external grease port, the other reversing valve mechanism is in a state of connection between the external grease port and the grease return port;

[0023] The main oil circuit includes oil circuits A and B, which are connected to the first and second external grease ports respectively;

[0024] There is at least one dual-line distributor having two first inlets and multiple first outlets, wherein the two first inlets are respectively connected to the two main oil circuits, and the multiple first outlets are respectively used to connect to the lubrication points in a certain area of ​​the equipment, or at least one of the multiple first outlets is used to connect to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets are used to connect to other lubrication points;

[0025] There is one or two progressive distributors, each having a second inlet and multiple second outlets for communicating with lubrication points in another area of ​​the equipment. When there is only one progressive distributor, it is connected to one of the A and B oil circuits through the second inlet; when there are two progressive distributors, each is connected to the A and B oil circuits through its own second inlet;

[0026] A safety protection module is provided on the oil line between the grease outlet and the grease inlet or on the A and B oil lines to protect the system from pressure exceeding the maximum safety pressure;

[0027] During operation, the amount of grease output by the progressive distributor is determined by the operating time set by the controller.

[0028] The beneficial effects of this solution are as follows: Since the progressive distributor is connected to the main oil circuit, taking the excavator as an example, the outlets of the dual-line distributor are respectively connected to the lubrication points on the boom and the bucket rod, and the outlets of the progressive distributor are respectively connected to the lubrication points on the horse head and the connecting rod. Since the connecting rod and the horse head are far away from the dual-line lubrication pump, the corresponding pipelines are longer and the pipe resistance is larger. Under normal circumstances, the dual-line distributor works first, and the grease of the dual-line lubrication pump is pumped out from one of the A and B oil circuits, first entering the reversing valve core of the dual-line distributor, and then entering the metering plunger, and the grease in the metering chamber is pumped to the lubrication points of the boom and the bucket rod through the corresponding outlets and pipelines. At the same time, the grease of the main oil circuit enters the progressive distributor. In the distributor, the various outlets of the progressive distributor alternately discharge grease to pump grease to the lubrication points of the horse-drawn joint and connecting rod. Because the connecting rod and horse-drawn joint require a large amount of grease, the progressive distributor can operate multiple strokes under the control of the controller until the grease pumped out meets the required amount of grease for the lubrication points of the connecting rod and horse-drawn joint. Moreover, when the grease demand in the connecting rod or horse-drawn joint area changes due to different machine models, different operating modes, different temperatures, and different pipe lengths, it is only necessary to adjust the operating time of the progressive distributor through the controller. This adjustment of the distributor operating time is achieved by the different actions of the dual-line lubrication pump, eliminating the need for complex components such as solenoid valves. Subsequently, until the grease output of the progressive distributor meets the required amount, the reversing valve mechanism is controlled to reverse, switching to the other main oil circuit to discharge grease. The valve cores in the dual-line distributor then reverse, thus entering another cycle.

[0029] From the above working process, it can be seen that the grease output of the dual-line distributor is distributed by its own structure, while the progressive distributor is controlled by the working time controlled by the controller while relying on its own structure for distribution. In other words, the total grease output of the dual-line distributor is determined by the diameter of its own plunger, while the grease output of the progressive distributor is no longer limited by the diameter of its own plunger, but is related to both the working time and the plunger diameter. For lubrication points with different oil requirements, it is only necessary to adjust the working time of the progressive distributor. There is no need to adjust the plunger structure of the progressive distributor or replace the progressive distributor. This means that no matter what type of engineering machinery, no matter what working mode of the engineering machinery, no matter how the oil requirement of each lubrication point changes due to changes in temperature, pipe length, etc., it is only necessary to set the outlet of the dual-line distributor to supply grease to the area with the smallest oil requirement, and make the progressive distributor supply grease to the area with the largest oil requirement. By adjusting the working time of the progressive distributor, the changes in different oil requirements can be met, greatly improving adaptability. In other words, by arranging the dual-line distributor on the A and B oil circuits closer to the pump, and the progressive distributor at the ends of the A and B oil circuits, and controlling the opening time of the A and B oil circuits respectively, the normal oil output of the dual-line distributor can be guaranteed, and the progressive distributor connected to the A and B oil circuits can be differentiated in lubrication, realizing the function of zoning control, and meeting the adjustment of the oil ratio under different working conditions of the main engine.

[0030] Through this solution, the current situation in which the displacement of the distributor of the existing centralized lubrication system is determined only by the size of the plunger can be changed, so that the distributor of the same size can be suitable for a wider range of displacement requirements and adapt to different lubrication scenarios, which facilitates the standardization of the distributor and effectively reduces costs. It is also convenient to adaptively adjust the displacement in real time through the controller, so that the centralized lubrication system is no longer in name only and can truly play the role of centralized lubrication.

[0031] In summary, the solution has a simple system structure, the distributor size is easy to standardize and is relatively small, it can be applied to the lubrication of lubrication points with different oil requirements without replacing the distributor, it is convenient to increase or decrease the number of lubrication points, it has strong scalability, it is convenient to detect faults, it is convenient to set the appropriate lubrication mode according to the different working modes of the equipment, and each lubrication point can be zoned for control. When the oil demand of the lubrication points in each area changes and the grease supply is adjusted, there is no interference with each other. The working time of the progressive distributors connected on the two main oil circuits can be different to achieve different displacement requirements. During use, the lubrication amount can be flexibly adjusted to a large extent, and zoned lubrication of different parts can be achieved. The degree of standardization is higher, and the amount of lubricating oil can be dynamically adjusted when the working conditions change.

[0032] Furthermore, the safety protection module includes an oil pressure switch, a relief valve, a safety valve, or an oil pressure sensor.

[0033] The beneficial effects of this solution are: the setting of the oil pressure switch, overflow valve, safety valve or oil pressure sensor can, on the one hand, protect the system from being damaged by excessive high pressure, that is, when excessive high pressure occurs, the control system will shut down in time to prevent the pipeline, plunger, etc. from being damaged by high pressure; on the other hand, the setting of the oil pressure switch can be used for fault detection and judgment, because when a blockage fault occurs in the system, it will inevitably lead to an increase in the pressure of the main oil circuit. When the oil pressure switch feeds back a high-pressure signal, it proves that there is a blockage fault in the running main oil circuit, and at this time, the maintenance personnel can be reminded to troubleshoot the fault in time.

[0034] Furthermore, a quick-connect connector is provided on the pipeline connected to part of the first outlets of the two-line distributor, and a one-way valve is provided on the quick-connect connector.

[0035] This solution offers the following benefits: By reserving a portion of the dual-line distributor's outlet and installing a quick-connect connector with a check valve, when accessories are replaced or new lubrication points are added, the quick-connect connector can be directly connected to the oil pipe at the newly added lubrication point, achieving extended lubrication functionality. This structure further enhances the scalability and adaptability of the centralized lubrication system. Alternatively, by installing a quick-connect connector on either the A or B oil line and adjusting the oil pump speed via a monitor, automatic and semi-automatic lubrication can be freely switched, meeting the needs of accessory lubrication and emergency lubrication.

[0036] Furthermore, the progressive distributor has one, which is connected to one of the A and B oil circuits through the second inlet, and the other end of the A and B oil circuits is provided with a quick plug connector, which has a one-way valve.

[0037] Furthermore, a single-line distributor is connected to the A and B oil lines to supply grease to the newly added lubrication points. The single-line distributor has a third inlet and a third outlet.

[0038] Beneficial effects of this solution: The setting of the single-line distributor can lubricate other newly added lubrication points. For example, when the slewing bearing of the excavator needs lubrication, grease can be supplied to it through the single-line distributor.

[0039] Furthermore, a quick-connect connector is provided on the pipeline connected to the third outlet, and a one-way valve is provided on the quick-connect connector.

[0040] The beneficial effects of this solution are: the setting of the quick-plug connector with a one-way valve makes the lubrication pipeline a spare lubrication pipe. When lubrication is needed, lubrication can be achieved directly by connecting it through the quick-plug connector. When lubrication is not needed, the quick-plug connector can be directly unplugged and the one-way valve can be used to automatically close the outlet. It is very convenient and is especially suitable for use in scenarios where accessories need to be replaced frequently.

[0041] Furthermore, a first outlet and / or a second outlet and / or a third outlet is also connected to a secondary progressive distributor or an impedance distributor.

[0042] Furthermore, the controller is provided with lubrication function control modules corresponding to at least two different working conditions. The lubrication function control module includes a human-computer interaction module for running, controlling and changing lubrication parameters in real time. Under the control of different lubrication function control modules, the lubrication requirements of different oil quantities at the lubrication points are met.

[0043] The beneficial effects of this solution are: through the setting of the lubrication function control module, for different working modes of engineering machinery, such as when an excavator uses a bucket and a breaker hammer, since the grease requirements of each point corresponding to the two working modes are different, the lubrication amount value of the corresponding mode can be preset through the lubrication function module. After switching the working mode by pressing buttons, etc., the corresponding lubrication scheme is adapted to the working mode.

[0044] Furthermore, the dual-line distributor has a metering valve core, which is provided with an indicator rod extending from the valve body of the dual-line distributor to indicate whether the metering valve core is actuated, or the dual-line distributor is provided with a sensor for detecting whether the metering valve core is actuated.

[0045] Beneficial effects of this solution: The setting of the indicator rod or sensor can detect whether the two-line distributor is working normally, and in conjunction with the oil pressure switch, the position of the fault can be accurately located.

[0046] Furthermore, the progressive distributor has a plunger, and the plunger is provided with an indicator rod extending out of the valve body of the progressive distributor to indicate whether the plunger is actuated, or the progressive distributor is provided with a sensor for detecting whether the plunger is actuated.

[0047] Furthermore, the single-line distributor has a metering valve core, and the metering valve core is provided with an indicator rod extending out of the valve body of the single-line distributor to indicate whether the metering valve core is actuated, or the single-line distributor is provided with a sensor for detecting whether the metering valve core is actuated.

[0048] Furthermore, the pipeline connecting the progressive distributor and the main oil circuit is defined as an oil inlet pipeline, and a one-way valve, a back pressure valve or a throttle valve that conducts one-way from upstream to downstream is provided on the oil inlet pipeline.

[0049] The beneficial effects of this solution are as follows: if a one-way valve is set, the backflow of grease can be prevented, and the oil pressure of the oil circuit upstream of the one-way valve can be increased to ensure that the dual-line distributor can smoothly switch and pump grease; the back pressure valve or throttle valve set can also increase the oil pressure of the oil circuit upstream of the one-way valve to ensure that the dual-line distributor can smoothly switch and pump grease.

[0050] Furthermore, at least one of the A and B oil circuits is provided with an oil separation switching valve or at least two switch valves; the oil separation switching valve has at least two oil outlet circuits, and the oil separation switching valve is used to realize the conduction switching of each oil outlet circuit and the corresponding main oil circuit. Each switch valve has an oil outlet circuit, and the switch valve is used to realize the connection and disconnection of the oil outlet circuit and the corresponding main oil circuit.

[0051] The beneficial effects of this solution are: the setting of the oil distribution switching valve or at least two switching valves enables the oil output time of each oil outlet circuit to be independently controlled. For example, the progressive distributor can be controlled to output oil until the lubrication demand is met, and then the oil is switched to another oil outlet circuit to output oil until the lubrication demand of the circuit is met. Moreover, the purpose of independent time-sharing oil supply can be achieved before the dual-line distributor is switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Schematic diagram of the principle of the dual-line centralized lubrication system embodiment 1 of the present invention;

[0053] Figure 2 This is a schematic diagram of the working principle of a dual-line lubrication pump;

[0054] Figure 3a Schematic diagram of the working principle of a single distribution unit of a two-line distributor (state 1);

[0055] Figure 3b Schematic diagram of the working principle of a single distribution unit of a two-line distributor (state 2);

[0056] Figure 4 This is a schematic diagram of the system principle of a dual-line centralized lubrication system according to embodiment 2 of the present invention;

[0057] Figure 5 This is a schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 3 of the present invention;

[0058] Figure 6 Schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 4 of the present invention;

[0059] Figure 7 This is a schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 5 of the present invention;

[0060] Figure 8 This is a schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 6 of the present invention;

[0061] Figure 9 Schematic diagram of the system principle of a dual-line centralized lubrication system according to embodiment 7 of the present invention;

[0062] Figure 10a Schematic diagram of the system principle of the dual-line centralized lubrication system embodiment 8 of the present invention;

[0063] Figure 10b Schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 9 of the present invention;

[0064] Figure 11 This is a schematic diagram of the system principle of another embodiment of a dual-line centralized lubrication system of the present invention;

[0065] Figure 12 for Figure 11 Schematic diagram of the working principle of the corresponding double-plunger lubrication pump;

[0066] Figure 13 This is a schematic diagram of the system principle of another embodiment 2 of a dual-line centralized lubrication system of the present invention;

[0067] Figure 14 Schematic diagram of the system principle of a dual-line centralized lubrication system embodiment 10 of the present invention;

[0068] In the figure: 1-excavator, 11-arm, 12-arm, 13-connecting rod, 14-bucket, 15-breaker hammer, 16-lubrication point; 2-dual-line lubrication pump, 21-pumping mechanism, 22-reversing valve mechanism, 23-reduction motor, 24-controller, 25-oil tank, 26-oil pressure switch, A and B are main oil circuits, P-grease inlet, T-grease return port, a and b are external grease ports, X-grease inlet, Y-grease outlet, 3-dual-line distributor, 31-first inlet, 32-first outlet, 33-Dual-line distribution unit, 4-Progressive distributor, 41-Second inlet, 42-Second outlet, 5-Single-line distributor, 6-Quick connector, 7-Check valve; 8-Dual-plunger lubrication pump, 81-Plunger pair, 82-Oil tank, 83-Reduction motor, 84-Controller, 85-Oil pressure switch, 9-Overflow valve, 10-Two-position three-way valve, 1a and 1b are oil inlets, 200-Reversing valve core, 300-Metering valve core, 400-Indicator rod, 500-Check valve, 6a and 6b are oil outlets. DETAILED DESCRIPTION

[0069] Example 1 of the dual-line centralized lubrication system of the present invention: Figure 1 As shown, this embodiment takes the scenario of application to an excavator as an example, and the dual-line centralized lubrication system includes a dual-line lubrication pump 2, two dual-line distributors 3, and two progressive distributors 4.

[0070] The dual-line lubrication pump 2 is used to pump grease, and includes a pumping mechanism 21, a reversing valve mechanism 22 and a controller 24; the pumping mechanism 21 has a grease inlet X for sucking grease and a grease outlet Y for discharging grease; the reversing valve mechanism 22 includes a reversing module and a reversing valve, and the reversing valve includes at least four oil ports, including a grease inlet P connected to the grease outlet Y, a grease return port T for connecting to a grease storage container, and a first and a second external grease ports a and b; the reversing valve is controlled by the reversing module so that when grease is discharged from the first external grease port a and grease is returned to the second external grease port b, the first external grease port a is connected to the grease inlet P and the second external grease port b is connected to the grease return port T; when grease is returned to the first external grease port a and grease is discharged from the second external grease port b, the first external grease port a is connected to the grease return port T and the second external grease port b is connected to the grease inlet P.

[0071] like Figure 2 The figure shows the working principle of the dual-line lubrication pump. The working principle is as follows: after the power is turned on, the reduction motor 23 starts to run, and the transmission shaft drives the eccentric wheel and the plunger assembly to suck grease from the oil tank 25 and send the sucked grease to the reversing valve mechanism 22 through its grease inlet P. The grease enters the main oil circuit A of the lubrication system through the reversing valve mechanism 22. Through the movement of the reversing valve core of the dual-line distributor 3, a small amount of grease is reversed through the main oil circuit B, passes through the reversing valve mechanism 22, and enters the oil tank 25 through the grease return port T for unloading. When main oil circuit A has been running for the time set by controller 24, it enters the pressure holding phase. At the end of the pressure holding phase, reduction motor 23 rotates in the reverse direction. This reverse rotation drives reversing valve mechanism 22 to reverse direction, switching it to another valve position in which P and B are connected and A and T are connected. At this point, grease output from reversing valve mechanism 22 enters main oil circuit B through grease inlet P, while grease in main oil circuit A flows back to oil tank 25 through grease return port T to unload. When main oil circuit B has been running for the time set by controller 24, it enters the pressure holding phase. At the end of the pressure holding phase, reduction motor 23 rotates in the reverse direction for 5 seconds to unload, then enters a rest state. During the operation of the reduction motor 23, if the pressure in the main oil circuit rises to the set pressure value of the oil pressure switch 26, the oil pressure switch 26 will feedback a signal to the controller 24, which will control the reduction motor 23 to stop operation to prevent the high pressure from damaging the lubrication system. At the same time, the feedback signal from the oil pressure switch 26 also indicates that there is a blockage in the operating main oil circuit and the corresponding distributor, which can alert maintenance personnel to promptly correct the problem. In other embodiments, the oil pressure switch can also be replaced with a safety valve, a relief valve, or an oil pressure sensor. When the system pressure reaches the set maximum safety pressure, the relief valve or safety valve will unload the pressure to ensure system safety.

[0072] like Figure 1 、 2As shown, the main oil circuits A and B refer to lubrication lines directly connected to the first and second external grease ports a and b respectively.

[0073] like Figure 1 As shown, there are two dual-line distributors 3, each of which has two first inlets 31 and multiple first outlets 32. The two first inlets 31 are respectively connected to the two main oil circuits A and B, and the multiple first outlets 32 are respectively connected to the lubrication points in a certain area of ​​the equipment, such as the lubrication points in the area of ​​the boom 11 and the bucket arm 12 on the excavator, or in other embodiments, at least one of the multiple first outlets 32 is connected to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets 32 are connected to other lubrication points, such as Figure 8 shown.

[0074] The double-line distributor 3 includes two types: block type and chip type. Its structure is the existing technology and will not be described in detail. However, in order to save volume, multiple double-line distribution units 33 are generally combined for use. Figure 1 The dual-line distributor 3 in the figure is actually a distributor group composed of multiple dual-line distribution units 33. Any adjacent dual-line distribution units 33 are connected in parallel to the main oil circuits A and B. The principle of each dual-line distribution unit 33 is basically the same, differing only in that the plunger diameter is adjusted according to the oil demand of the lubrication point. For example, if one lubrication point requires 1 unit of oil, while another requires 3 units of oil, the ratio of the plunger cross-sectional areas corresponding to these two lubrication points is 1:3.

[0075] The following is an introduction to the principle of a single dual-line distributor unit. When working, the oil inlets 1a and 1b are connected to the main oil circuits A and B respectively. Figure 3a As shown, when grease pumped by the lubrication pump enters the dual-line distribution unit through oil inlet 1a, it first enters the left chamber of reversing valve core 200, pushing reversing valve core 200 rightward. The grease on the right side of reversing valve core 200 flows out through oil inlet 1b into main oil circuit B, unloading the grease. As reversing valve core 200 moves rightward, the left chamber of metering valve core 300 connects with the left chamber of reversing valve core 200, and the right chamber of metering valve core 300 connects with oil outlet 6b. The pumped grease enters the left chamber of metering valve core 300, pushing metering valve core 300 rightward and pressurizing the grease in the right chamber of metering valve core 300 through oil outlet 6b (i.e., the second outlet) to the lubrication point, completing the first stage of the operation.

[0076] Then, after the grease is distributed by the progressive distributor and the set working time of the progressive distributor is reached, the reduction motor in the lubrication pump reverses, the grease is pumped out from the main oil circuit B, and the main oil circuit A is unloaded and returns oil.

[0077] like Figure 3bAs shown, when the grease pumped by the lubrication pump enters the dual-line distribution unit through oil inlet 1b, it first enters the right chamber of the reversing valve core 200, pushing the reversing valve core 200 leftward. The grease on the left side of the reversing valve core 200 flows out through oil inlet 1a into the main oil circuit A, thus unloading. As the reversing valve core 200 moves leftward, the right chamber of the metering valve core 300 connects with the right chamber of the reversing valve core 200, and the left chamber of the metering valve core 300 connects with the oil outlet 6a. The pumped grease enters the right chamber of the metering valve core 300, pushing the metering valve core 300 leftward and pressurizing the grease in the left chamber of the metering valve core 300 through oil outlet 6a (i.e., the second outlet) to the lubrication point, completing the second stage of the operation.

[0078] In this embodiment, the specific number of dual-line distribution units 33 used in each dual-line distributor 3 is determined by the number of lubrication points and the required oil volume in the lubricated area. The more lubrication points and the more oil volume required for the lubrication points, the more dual-line distribution units 33 are required.

[0079] In this embodiment, there are two progressive distributors 4, and both have a second inlet 41 and multiple second outlets 42 connected to the lubrication points in another area of ​​the equipment. The two progressive distributors 4 are connected to the main oil circuits A and B respectively through their respective second inlets 41. The two progressive distributors 4 respectively pressurize grease to areas with relatively large oil requirements such as the horse head and the connecting rod 13. The structure and working principle of the progressive distributor 4 are prior art and will not be described here. In simple terms, the progressive distributor 4 has an oil inlet and multiple oil outlets, and every two oil outlets correspond to an internal plunger and plunger cavity. Each plunger alternates under the drive of the grease, so that each oil outlet alternates to discharge oil. The progressive distributor 4 also includes two types: sheet type and block type.

[0080] In this embodiment, in order to facilitate the lubrication of the newly added lubrication points after the excavator replaces the accessories, a quick-connect connector 6 is provided on the pipeline connected to the first outlet 32 ​​of the dual-line distributor 3. In this embodiment, a new dual-line distributor 3 is added, and the dual-line distributor 3 is still connected to the main oil circuits A and B. After the oil outlets of the dual-line distributor 3 are merged, they are connected to the grease supply pipe of the breaker 15 through a grease supply pipe, and the connection method is to connect through a quick-connect connector 6 with a one-way valve 7, so that in the bucket 14 mode, the quick-connect connector 6 is in an unconnected state, and the one-way valve 7 therein automatically disconnects the oil circuit; when in the breaker hammer 15 mode, the quick-connect connector 6 connected to the dual-line distributor 3 is quickly connected to the quick-connect connector 6 on the breaker hammer 15, and the oil circuit is automatically opened after connection, so that the dual-line distributor 3 can supply grease to the lubrication points on the breaker hammer 15.

[0081] like Figure 3aAs shown, in order to conveniently check whether the two-line distributor is working properly, an indicator rod 400 extending from the valve body of the two-line distributor is provided on the metering valve core of the two-line distributor to indicate whether the metering valve core is actuated. Alternatively, in other embodiments, a sensor for detecting whether the metering valve core is actuated, such as a Hall sensor, is provided on the two-line distributor, and a magnet portion is provided on the metering valve core to cooperate with the sensor.

[0082] Similarly, in order to facilitate checking whether the progressive distributor 4 is working normally, an indicator rod extending out of the valve body of the progressive distributor is provided on the plunger of the progressive distributor 4 to show whether the plunger is moving, or a sensor for detecting whether the plunger is moving, such as a Hall sensor, is provided on the progressive distributor.

[0083] In this embodiment, the controller 24 can control the grease delivery time of each main oil circuit by controlling the reduction motor 23, that is, the grease delivery time of the progressive distributor 4. The longer the grease delivery time of the progressive distributor 4, the greater the total displacement. By controlling this time, it can be adaptively adjusted according to the number of lubrication points required. When the oil demand of a lubrication point changes, it can be adjusted by adjusting the grease delivery time of the corresponding oil circuit. This feature makes it easy to ensure that the oil demand of the lubrication point changes due to factors such as changes in equipment operating mode, changes in lubrication line length, temperature changes, or changes in equipment model by adjusting the operating time of the progressive distributor 4. On the other hand, when the controller controls each main oil circuit, the operation can be divided into multiple operations while the total operating time remains unchanged. That is, the reduction motor can start for a period of time, then stop, and then start and stop again, dividing the grease delivery into multiple operations, with small amounts of grease delivered multiple times. This ensures that the grease is fully utilized by the lubrication points, and the sum of the effective operating time of the multiple operations equals the designed total operating time.

[0084] The oil pressure switch 26 protects the system from damage caused by excessive pressure. When excessive pressure occurs, the control system shuts down immediately to prevent damage to the pipelines, plungers, and other components. Furthermore, the oil pressure switch 26 facilitates fault detection and diagnosis. A blockage in the system inevitably increases the pressure in the main oil circuit. A high-pressure signal from the oil pressure switch 26 indicates a blockage in the main oil circuit, alerting maintenance personnel to promptly troubleshoot the problem. The indicator rod or sensor detects the proper functioning of the dual-line distributor 3 and, in conjunction with the oil pressure switch 26, accurately locates the fault.

[0085] Since the progressive distributor 4 is connected to the main oil circuit, taking the excavator as an example, the outlets of the dual-line distributor 3 are respectively connected to the lubrication points on the boom 11 and the bucket rod 12, and the outlets of the progressive distributor 4 are respectively connected to the lubrication points of the horse head and the connecting rod 13. Since the connecting rod 13 and the horse head are far away from the dual-line lubrication pump 2, the corresponding pipelines are longer and the pipeline resistance is larger. Under normal circumstances, the dual-line distributor 3 works first, and the grease of the dual-line lubrication pump 2 is pumped out from one of the A and B oil circuits, first entering the reversing valve core of the dual-line distributor 3, and then entering the metering plunger, and the grease in the metering chamber is pumped to the lubrication points of the boom 11 and the bucket rod 12 through the corresponding outlets and pipelines. At the same time, the grease of the main oil circuit enters the progressive distributor 4 In this process, the various outlets of the progressive distributor 4 alternately discharge grease to pump grease to the lubrication points of the horse-drawn carriage and connecting rod 13. Because the connecting rod 13 and the horse-drawn carriage require a large amount of oil, under the control of the controller 24, the progressive distributor 4 can operate for multiple strokes until the grease pumped out meets the required amount of grease for the lubrication points of the connecting rod 13 and the horse-drawn carriage. Moreover, when the grease demand in the connecting rod 13 or the horse-drawn carriage area changes due to different machine models, different operating modes, different temperatures, and different pipe lengths, it is only necessary to adjust the operating time of the progressive distributor 4 through the controller 24. This adjustment of the distributor's operating time is achieved by the different actions of the dual-line lubrication pump 2, without the need for complex components such as solenoid valves. Subsequently, until the grease output of the progressive distributor 4 meets the required amount, the reversing valve mechanism 22 is controlled to reverse, switching to the other main oil circuit to discharge grease. The valve cores in the dual-line distributor 3 are reversed, thus entering another cycle.

[0086] It can be seen from the above working process that the grease output of the dual-line distributor 3 is distributed by its own structure, and the progressive distributor 4 is controlled by the working time controlled by the controller 24 while relying on its own structure for distribution. In other words, the total grease output of the dual-line distributor 3 is determined by the diameter of its own plunger, and the grease output of the progressive distributor 4 is no longer limited by the diameter of its own plunger, but is related to the working time and the plunger diameter. For lubrication points with different oil requirements, it is only necessary to adjust the working time of the progressive distributor 4, without adjusting the plunger structure of the progressive distributor 4 or replacing the progressive distributor 4. This means that no matter what type of engineering machinery, no matter what working mode of the engineering machinery, no matter how the oil requirement of each lubrication point changes due to changes in temperature, pipe length, etc., it is only necessary to supply grease to the area with the smallest oil requirement through the outlet of the dual-line distributor 3, and to supply grease to the area with the largest oil requirement through the progressive distributor 4. By adjusting the working time of the progressive distributor 4, the changes in different oil requirements can be met, greatly improving adaptability.

[0087] Through this solution, the current situation in which the displacement of the distributor of the existing centralized lubrication system is determined only by the size of the plunger can be changed, so that the distributor of the same size can be suitable for a wider range of displacement requirements and adapt to different lubrication scenarios, which facilitates the standardization of the distributor and effectively reduces costs. It is also convenient to adaptively adjust the displacement in real time through the controller 24, so that the centralized lubrication system is no longer in name only and can actually play the role of centralized lubrication.

[0088] The controller is equipped with lubrication function control modules corresponding to at least two different operating conditions. The lubrication function control modules include a human-machine interaction module for operating, controlling, and changing lubrication parameters in real time. Under the control of different lubrication function control modules, the lubrication requirements of different lubrication points are met. Through the configuration of the lubrication function control modules, for different operating modes of engineering machinery, such as when an excavator uses a bucket and a breaker, the lubrication quantity values ​​corresponding to the different operating modes can be preset through the lubrication function module. After switching the operating mode through buttons, Bluetooth, wireless, bus, etc., the corresponding lubrication solution is adapted to the operating mode.

[0089] Example 2 of the dual-line centralized lubrication system of the present invention: Figure 4 As shown, this embodiment differs from Example 1 in that it is a basic lubrication system. While only one dual-line distributor 3 is provided in this embodiment, it still includes multiple dual-line distribution units 33. The number of dual-line distribution units 33 is determined by the number of lubrication points to be lubricated and the amount of grease required. This embodiment is similar to Example 1 in that both utilize a block-type dual-line distributor 3. Two oil circuits are provided within the block-type distributor, running through each dual-line distribution unit 33. These two oil circuits are connected to the main oil circuits A and B. Furthermore, the second inlet 41 of the progressive distributor 4 is connected to the two oil circuits running through the dual-line distributor 3, effectively also connecting to the main oil circuit.

[0090] Example 3 of the dual-line centralized lubrication system of the present invention: Figure 5As shown, the difference from Example 1 lies in that the two progressive distributors 4 are connected to the main oil line upstream of the dual-line distributor 3. The dual-line distributor 3 is a plate-type distributor composed of multiple distributor plates. Each dual-line distributor 3 plate corresponds to a dual-line distributor 3 unit, having two first inlets 31 and two first outlets 32. In this embodiment, a check valve 7 is also installed in the pipeline before the second inlet 41 of the progressive distributor 4. On the one hand, it increases the resistance of the grease flowing to the progressive distributor 4, allowing the dual-line distributor 3 to operate before the progressive distributor 4. At the same time, the check valve 7 also prevents the grease from the progressive distributor 4 from flowing back. In other embodiments, the check valve 7 can also be replaced with a backpressure valve or a throttle valve. If a one-way valve is installed, it can prevent the grease from flowing back and increase the oil pressure in the oil circuit upstream of the one-way valve to ensure that the dual-line distributor can smoothly switch and pump the grease; the back pressure valve or throttle valve installed can also increase the oil pressure in the oil circuit upstream of the one-way valve to ensure that the dual-line distributor can smoothly switch and pump the grease.

[0091] Example 4 of the dual-line centralized lubrication system of the present invention: Figure 6 As shown, the difference from Example 1 is that two small dual-line distributors 3 are respectively set upstream and downstream of the main oil circuit. The upstream dual-line distributor 3 is used to supply grease to the lubrication points on the boom 11, and the downstream dual-line distributor 3 is used to supply grease to the lubrication points at the boom 12. The two progressive distributors 4 supply grease to the lubrication points in the horse head and connecting rod 13 areas respectively.

[0092] Example 5 of the dual-line centralized lubrication system of the present invention: Figure 7 As shown, the difference from Example 1 is that only one double-line distributor 3 is provided, and a part of the grease outlet Y of the double-line distributor 3 is used to supply grease to the lubrication points at the boom 11 and the dipper arm 12, while the other part of the lubrication points are merged and merged into a total lubrication pipe, a quick-connect connector 6 with a one-way valve 7 is provided at the end of the lubrication pipe. When the excavator is replaced by the bucket 14 with the breaker hammer 15, it can be connected to the quick-connect connector 6 reserved on the breaker hammer 15 to supply grease to the lubrication points on the breaker hammer 15.

[0093] Example 6 of the dual-line centralized lubrication system of the present invention: Figure 8 As shown, the difference from Example 1 is that for super-large excavators, some lubrication points are also added to the slewing bearings. At this time, a progressive distributor 4 can be connected behind one or several first outlets 32 of the double-line distributor 3, so that the progressive distributor 4 can be used to supply grease specifically to various lubrication points on the slewing bearings.

[0094] Example 7 of the dual-line centralized lubrication system of the present invention: Figure 9As shown, the difference from Example 6 is that a single-line distributor 5 is connected upstream of one of the main oil circuits, and the single-line distributor 5 can be used to supply grease to newly added lubrication points, such as slewing bearings, or to the root of the upper arm 11 and other parts.

[0095] Example 8 of the dual-line centralized lubrication system of the present invention: Figure 10a As shown, the difference from Example 1 is that a mother and a child progressive distributor are sequentially arranged on the main oil circuit A. Taking the excavator as an example, the two child progressive distributors are used to supply grease to the lubrication points in the connecting rod area and the horse head area respectively, and a quick-connector with a one-way valve is provided on the main oil circuit B to supply grease to newly added accessories, such as a breaker hammer. When replacing the breaker hammer, the quick-connector on this circuit is connected to the quick-connector preset on the breaker hammer to supply grease to the breaker hammer. When the bucket is used for work, the quick-connector is unplugged, and the one-way valve inside it automatically blocks the quick-connector.

[0096] Example 9 of the dual-line centralized lubrication system of the present invention: Figure 10b As shown, the difference from Example 8 is that part of the outlets of the progressive distributor connected to the rear of the main oil circuit A are combined to supply grease to the sub-progressive distributor, while the other part of the outlets directly supply grease to the lubrication points through the lubrication pipe.

[0097] Dual-line centralized lubrication system embodiment 10 of the present invention: Figure 14 As shown, the difference from Example 4 is that an oil distribution switching valve is further provided on the main oil circuit B between the second dual-line distributor 3 and the progressive distributor 4 downstream thereof. The oil distribution switching valve is a two-position three-way solenoid valve (i.e., a two-position three-way valve 10). The oil distribution switching valve has one oil inlet and two oil outlets, one of which is connected to the oil inlet of the subsequent progressive distributor 4. The other oil outlet is provided at the end of an oil pipe quick connector (i.e., a quick connector 6) to facilitate docking with the oil pipe quick connector 6 on the reserved lubrication pipe of the breaker. During use, the oil distribution switching valve can be used to control the main oil circuit B to be connected to the progressive distributor 4 or to the breaker. For example, the oil distribution switching valve can first be used to control the main oil circuit B to be connected to the progressive distributor 4 to supply grease to the lubrication points on the connecting rod. When the grease on the connecting rod reaches the required amount, the valve is switched to be connected to the breaker until the required amount of grease is reached. In other embodiments, the oil-distribution switching valve can be replaced by two on-off valves, each corresponding to a corresponding oil outlet line. Of course, if three oil outlet lines are required, the oil-distribution switching valve can be a three-position, four-way valve or three on-off valves. The switching mode of the oil-distribution switching valve or the on-off valve can be manual, electric, or program-controlled. Of course, an oil-distribution switching valve or on-off valve can also be provided on main oil line A.

[0098] In other embodiments, the various embodiments of the present invention can be applied to engineering machinery such as loaders and rotary drills, and can also be applied to the lubrication of complex equipment in the fields of ports, terminals, production lines, etc.

[0099] Another embodiment of the dual-line centralized lubrication system of the present invention: Figure 11 As shown, the biggest difference between this embodiment and the above embodiments is that a double-plunger lubrication pump 8 is used, and a two-position three-way valve 10 and a relief valve 9 are provided on each main oil circuit. Specifically, it includes a double-plunger lubrication pump for pumping grease, and the double-plunger lubrication pump includes a pumping mechanism, a reversing valve mechanism, a relief valve and a controller; the pumping mechanism includes at least two plunger pairs, each plunger pair has a grease inlet for sucking grease and a grease outlet for discharging grease; there are two reversing valve mechanisms, each of which includes a reversing module and a three-way reversing valve, and the three-way reversing valve includes a grease inlet connected to the grease outlet of one of the plunger pairs, a grease return port for connecting to a grease storage container, and an external grease port. Under the control of the two reversing modules, when one reversing valve mechanism is in a state of connection between the grease inlet and the external grease port, the other reversing valve mechanism is in a state of connection between the external grease port and the grease return port; there are two relief valves, which are respectively arranged on the oil circuit between the two grease outlets and the two grease inlets, and the overflow port of the relief valve is connected to the grease storage container. The main oil circuit includes main oil circuits A and B, which are respectively connected to the external grease ports a and b of the two three-way reversing valves;

[0100] There is one dual-line distributor with two first inlets and multiple first outlets. The two first inlets are respectively connected to the two main oil circuits, and the multiple first outlets are respectively connected to the lubrication points in a certain area of ​​the equipment, or at least one of the multiple first outlets is connected to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets are connected to other lubrication points.

[0101] There are two progressive distributors, each with a second inlet and multiple second outlets connected to lubrication points in another area of ​​the equipment. When there is only one progressive distributor, it is connected to one of the A and B oil circuits through the second inlet; when there are two progressive distributors, they are connected to the A and B oil circuits respectively through their own second inlets; when working, the amount of grease output of the progressive distributor is determined by the operating time set by the controller.

[0102] like Figure 12The figure shows a schematic diagram of the working principle of the double-plunger lubrication pump 8. The double-plunger lubrication pump 8 has two outlets, which are connected to the main oil circuits A and B respectively. An overflow valve and a two-position three-way valve are respectively provided on the main oil circuits A and B. The two-position three-way valve is a solenoid valve, and the oil port of the overflow valve is connected to the oil tank. After starting the reduction motor 83, the two plunger pairs 81 are driven to move through the transmission mechanism and the cam mechanism. The two plunger pairs 81 pump out the grease in the oil tank 82 from their outlets and enter the main oil circuits A and B respectively. After passing through the relief valve 9, they enter their respective two-position three-way valves. When the main oil circuit A is working, the two-position three-way valve on the main oil circuit A is in the first valve position. In this valve position, the grease inlet P of the two-position three-way valve on the main oil circuit A is connected with the external grease port a, and the two-position three-way valve on the main oil circuit B is in the second valve position, and its external grease port b is connected with its grease return port, so that the grease on the main oil circuit B can be unloaded to the oil tank, and the outlet of the double-plunger lubrication pump connected to the main oil circuit B is disconnected. When it reaches the opening pressure of the relief valve 9 on the main oil circuit B, it is unloaded to the oil tank.

[0103] like Figure 11 As shown, when the main oil circuit A is working, after the reversing valve core of the dual-line distributor is in place, or while the reversing valve core is moving, the progressive distributor on the main oil circuit A starts to work, and its working time is controlled by the controller, which can be adjusted according to the oil requirement of the lubrication point to be lubricated. When the progressive distributor on the main oil circuit A is completed, the two-position three-way valves on the main oil circuits A and B are controlled to move respectively to switch to another valve position, so that the external grease port a of the two-position three-way valve on the main oil circuit A is connected to the grease return port for unloading, and the grease inlet P of the two-position three-way valve on the main oil circuit B is connected to the external grease port b for grease supply.

[0104] Another embodiment of the dual-line centralized lubrication system of the present invention is as follows: Figure 13 As shown, in this embodiment, the difference from another dual-line centralized lubrication system embodiment 1 is that its two-position three-way valve structure is different, and its grease inlet and the external grease port are always in a connected state. Under the control of the controller: when one of the two-position three-way valves is in a disconnected state between the external grease port and the grease return port, the other two-position three-way valve is in a connected state between the external grease port and the grease return port.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. Dual-line centralized lubrication system, characterized by: include: A dual-line lubrication pump for pumping grease includes a pumping mechanism, a reversing valve mechanism, and a controller; the pumping mechanism has a grease inlet for sucking grease and a grease outlet for discharging grease; the reversing valve mechanism includes a reversing module and a reversing valve, the reversing valve including at least four oil ports, including a grease inlet connected to the grease outlet, a grease return port for connecting to a grease storage container, and first and second external grease ports; the reversing valve is controlled by the reversing module so that when grease is discharged from the first external grease port and grease is returned from the second external grease port, the first external grease port is connected to the grease inlet, and the second external grease port is connected to the grease return port; when grease is returned from the first external grease port and grease is discharged from the second external grease port, the first external grease port is connected to the grease return port, and the second external grease port is connected to the grease inlet; The main oil circuit includes oil circuits A and B, which are connected to the first and second external grease ports respectively; There is at least one dual-line distributor having two first inlets and multiple first outlets, wherein the two first inlets are respectively connected to the two main oil circuits, and the multiple first outlets are respectively used to connect to the lubrication points in a certain area of ​​the equipment, or at least one of the multiple first outlets is used to connect to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets are used to connect to other lubrication points; There is one or two progressive distributors, each having a second inlet and multiple second outlets for communicating with lubrication points in another area of ​​the equipment. When there is only one progressive distributor, it is connected to one of the A and B oil circuits through the second inlet; when there are two progressive distributors, each is connected to the A and B oil circuits through its own second inlet; A safety protection module is provided on the oil line between the grease outlet and the grease inlet or on the A and B oil lines to protect the system from pressure exceeding the maximum safety pressure; During operation, the amount of grease output by the progressive distributor is determined by the operating time set by the controller.

2. The dual-line centralized lubrication system according to claim 1, characterized in that: The safety protection module includes an oil pressure switch, an overflow valve, a safety valve, or an oil pressure sensor.

3. The dual-line centralized lubrication system according to claim 1, characterized in that: A quick-connect connector is provided on the pipeline connected to part of the first outlets of the dual-line distributor, and a one-way valve is provided on the quick-connect connector.

4. The dual-line centralized lubrication system according to claim 1, characterized in that: The progressive distributor has one, which is connected to one of the A and B oil circuits through a second inlet. The other end of the A and B oil circuits is provided with a quick plug connector, which has a one-way valve.

5. The dual-line centralized lubrication system according to claim 1, characterized in that: A single-line distributor is also connected to the A and B oil lines to supply grease to the newly added lubrication points. The single-line distributor has a third inlet and a third outlet.

6. The dual-line centralized lubrication system according to claim 5, characterized in that: A quick-connect joint is provided on the pipeline connected to the third outlet, and a one-way valve is provided on the quick-connect joint.

7. The dual-line centralized lubrication system according to claim 5, characterized in that: A second-stage progressive distributor or an impedance distributor is also connected to one of the first outlets and / or the second outlet and / or the third outlet.

8. The dual-line centralized lubrication system according to claim 1, characterized in that: The controller is provided with lubrication function control modules corresponding to at least two different working conditions. The lubrication function control module includes a human-computer interaction module for running, controlling and changing lubrication parameters in real time. Under the control of different lubrication function control modules, the lubrication requirements of different oil quantities at the lubrication points are met.

9. The dual-line centralized lubrication system according to claim 1 or 2, characterized in that: The dual-line distributor has a metering valve core, which is provided with an indicator rod extending from the valve body of the dual-line distributor to indicate whether the metering valve core is actuated, or a sensor is provided on the dual-line distributor to detect whether the metering valve core is actuated.

10. The dual-line centralized lubrication system according to claim 1 or 2, characterized in that: The progressive distributor has a plunger, and an indicator rod extending out of the valve body of the progressive distributor is provided on the plunger to indicate whether the plunger is in motion, or a sensor for detecting whether the plunger is in motion is provided on the progressive distributor.

11. The dual-line centralized lubrication system according to claim 5, characterized in that: The single-line distributor has a metering valve core, which is provided with an indicator rod extending from the valve body of the single-line distributor to indicate whether the metering valve core is actuated, or a sensor is provided on the single-line distributor to detect whether the metering valve core is actuated.

12. The dual-line centralized lubrication system according to claim 1, characterized in that: The pipeline connecting the progressive distributor and the main oil circuit is defined as the oil inlet pipeline, and a one-way valve, a back pressure valve or a throttle valve that conducts one-way from upstream to downstream is provided on the oil inlet pipeline.

13. The dual-line centralized lubrication system according to claim 1, characterized in that: At least one of the A and B oil circuits is provided with an oil separation switching valve or at least two switch valves; the oil separation switching valve has at least two oil outlet circuits, and the oil separation switching valve is used to realize the conduction switching of each oil outlet circuit and the corresponding main oil circuit. Each switch valve has an oil outlet circuit, and the switch valve is used to realize the connection and disconnection of the oil outlet circuit and the corresponding main oil circuit.

14. Dual-line centralized lubrication system, characterized in that: include: A double-plunger lubrication pump for pumping grease comprises a pumping mechanism, a reversing valve mechanism and a controller; the pumping mechanism comprises at least two plunger pairs, each plunger pair having a grease inlet for sucking grease and a grease outlet for discharging grease; there are two reversing valve mechanisms, each of which comprises a reversing module and a three-way reversing valve, the three-way reversing valve comprising a grease inlet, a grease return port for connecting to a grease storage container and an external grease port, the grease inlet of one three-way reversing valve being connected to the grease outlet of at least one plunger pair, and the grease inlet of the other three-way reversing valve being connected to the grease outlet of at least one of the remaining plunger pairs; under the control of the two reversing modules: when one reversing valve mechanism is in a state of connection between the grease inlet and the external grease port, the other reversing valve mechanism is in a state of connection between the external grease port and the grease return port; The main oil circuit includes oil circuits A and B, which are connected to the first and second external grease ports respectively; There is at least one dual-line distributor having two first inlets and multiple first outlets, wherein the two first inlets are respectively connected to the two main oil circuits, and the multiple first outlets are respectively used to connect to the lubrication points in a certain area of ​​the equipment, or at least one of the multiple first outlets is used to connect to the lubrication points in a certain area of ​​the equipment through the next-level distributor, and the remaining first outlets are used to connect to other lubrication points; There is one or two progressive distributors, each having a second inlet and multiple second outlets for communicating with lubrication points in another area of ​​the equipment. When there is only one progressive distributor, it is connected to one of the A and B oil circuits through the second inlet; when there are two progressive distributors, each is connected to the A and B oil circuits through its own second inlet; A safety protection module is provided on the oil line between the grease outlet and the grease inlet or on the A and B oil lines to protect the system from pressure exceeding the maximum safety pressure; During operation, the amount of grease output by the progressive distributor is determined by the operating time set by the controller.

15. The dual-line centralized lubrication system according to claim 14, characterized in that: The safety protection module includes an oil pressure switch, an overflow valve, a safety valve, or an oil pressure sensor.

16. The dual-line centralized lubrication system according to claim 14, characterized in that: A quick-connect connector is provided on the pipeline connected to part of the first outlets of the dual-line distributor, and a one-way valve is provided on the quick-connect connector.

17. The dual-line centralized lubrication system according to claim 14, characterized in that: The progressive distributor has one, which is connected to one of the A and B oil circuits through a second inlet. The other end of the A and B oil circuits is provided with a quick plug connector, which has a one-way valve.

18. The dual-line centralized lubrication system according to claim 14, characterized in that: A single-line distributor is also connected to the A and B oil lines to supply grease to the newly added lubrication points. The single-line distributor has a third inlet and a third outlet.

19. The dual-line centralized lubrication system according to claim 18, characterized in that: A quick-connect joint is provided on the pipeline connected to the third outlet, and a one-way valve is provided on the quick-connect joint.

20. The dual-line centralized lubrication system according to claim 18, characterized in that A second-stage progressive distributor or an impedance distributor is also connected to one of the first outlets and / or the second outlet and / or the third outlet.

21. The dual-line centralized lubrication system according to claim 14, characterized in that: The controller is provided with lubrication function control modules corresponding to at least two different working conditions. The lubrication function control module includes a human-computer interaction module for running, controlling and changing lubrication parameters in real time. Under the control of different lubrication function control modules, the lubrication requirements of different oil quantities at the lubrication points are met.

22. The dual-line centralized lubrication system according to claim 14 or 15, characterized in that: The dual-line distributor has a metering valve core, which is provided with an indicator rod extending from the valve body of the dual-line distributor to indicate whether the metering valve core is actuated, or a sensor is provided on the dual-line distributor to detect whether the metering valve core is actuated.

23. The dual-line centralized lubrication system according to claim 14 or 15, characterized in that: The progressive distributor has a plunger, and an indicator rod extending out of the valve body of the progressive distributor is provided on the plunger to indicate whether the plunger is in motion, or a sensor for detecting whether the plunger is in motion is provided on the progressive distributor.

24. The dual-line centralized lubrication system according to claim 18, characterized in that The single-line distributor has a metering valve core, which is provided with an indicator rod extending from the valve body of the single-line distributor to indicate whether the metering valve core is actuated, or a sensor is provided on the single-line distributor to detect whether the metering valve core is actuated.

25. The dual-line centralized lubrication system according to claim 14, characterized in that The pipeline connecting the progressive distributor and the main oil circuit is defined as the oil inlet pipeline, and a one-way valve, a back pressure valve or a throttle valve that conducts one-way from upstream to downstream is provided on the oil inlet pipeline.

26. The dual-line centralized lubrication system according to claim 14, characterized in that At least one of the A and B oil circuits is provided with an oil separation switching valve or at least two switch valves; the oil separation switching valve has at least two oil outlet circuits, and the oil separation switching valve is used to realize the conduction switching of each oil outlet circuit and the corresponding main oil circuit. Each switch valve has an oil outlet circuit, and the switch valve is used to realize the connection and disconnection of the oil outlet circuit and the corresponding main oil circuit.

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