CN114542932B

CN114542932B - Method for filling lubricating grease into mechanical equipment with multiple friction pairs

Info

Publication number: CN114542932B
Application number: CN202210149030.3A
Authority: CN
Inventors: 赵大平; 张�荣; 刘新功; 张同军
Original assignee: ZHENGZHOU AUTOL TECHNOLOGY CO LTD
Current assignee: ZHENGZHOU AUTOL TECHNOLOGY CO LTD
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2023-12-05
Anticipated expiration: 2042-02-18
Also published as: CN114542932A

Abstract

The invention relates to a method for filling lubricating grease into mechanical equipment with a plurality of friction pairs. The lubrication point on the equipment is preset with a pressure oil filling cup, the tail end of the oil filling pipe is provided with an oil filling nozzle which can be matched and butted with the pressure oil filling cup, a centralized lubrication system is arranged on the equipment to lubricate each lubrication point, the equipment is provided with an independent oil filling pipe, when the oil filling pipe is required to be used, the oil outlet of the lubrication pump is switched to be communicated with the front end of the oil filling pipe, the lubrication pump is started to be respectively communicated with the pressure oil filling cup on each friction pair of the mechanical equipment to be lubricated in sequence through the oil filling pipe, and lubricating grease is filled into each friction pair through the oil filling pipe and the pressure oil filling cup. According to the invention, by changing the lubricating pump and the corresponding centralized lubricating system, the lubricating pump can be connected with an independent greasing pipe on the premise of normal lubrication so as to grease a fault or a lubrication point needing manual greasing, namely, the dual functions of automatic lubrication and semiautomatic point-by-point lubrication are realized, and a set of oiling machine is not needed to be additionally arranged.

Description

Method for filling lubricating grease into mechanical equipment with multiple friction pairs

Technical Field

The invention relates to a method for filling lubricating grease into mechanical equipment with a plurality of friction pairs.

Background

The mechanical equipment generally has moving parts, and friction pairs are formed between the moving parts, for example, engineering machinery. The engineering machinery is an important component of equipment industry and is mainly used in the fields of national defense construction engineering, traffic and transportation construction, energy industry construction and production, raw material industry construction and production such as mines, agriculture, forestry, water conservancy construction, industrial and civil buildings, city construction, environmental protection and the like. The working condition is complex, the working object is changeable, the working is usually carried out under the condition of changing load, and the requirements on the reliability and the adaptability of the machine are high. In order to ensure that the friction pair positions of the bearing, the hinge shaft and the like can well run under the condition of high-strength construction operation for a long time, the shaft pin and the shaft sleeve are required to be effectively lubricated.

For this, the traditional mode generally includes two modes, and one mode is manual grease gun, and grease is filled to grease filling point position through the glib talker on the friction pair, but this kind of mode needs the shut down operation on the one hand, because of the multiple needs of grease filling point position, can't accomplish all grease filling point positions of a rifle oil, still need to fill oil in the grease gun repeatedly, complex operation and easy pollution delay the construction process, and intensity of labour is big and because personnel's quality is different, often appear because of lubricated untimely pivot or axle sleeve wearing and tearing that causes.

The other way is to install a centralized lubrication system on the engineering machinery, wherein the centralized lubrication system is a system for accurately supplying grease to a plurality of grease filling points according to a certain rule (period and oil quantity) from a lubrication pump through a pipeline connection oil separator. The centralized lubrication system generally comprises a lubrication pump, a distributor, a lubrication pipeline and the like, wherein the lubrication pump is integrated with a motor, a plunger pair, an oil tank, a monitor and the like, grease can be filled into each grease filling point according to set time through the monitor, the distributor is a distribution valve and is provided with 1-2 oil inlets and a plurality of oil outlets, the plunger pair is arranged in the distributor, grease entering from the oil inlets distributes the grease through the movement of the plunger pair and then is discharged from each oil outlet, and then is conveyed to the grease filling point of each friction pair of the mechanical equipment through the pipeline. The whole process does not need manual operation, but runs automatically, which is also a place where the centralized lubrication system is superior to the traditional lubrication mode. However, the centralized lubrication system has the defects that the system is fragile, the probability of failure is high, and the reasons of the failure mainly comprise the following steps:

1. Because the space for the grease to pass through is smaller in the friction pair (the pin shaft and the shaft sleeve), accumulated metal abrasive dust, entering dust, dry grease and the like are formed into oil sludge after long-time running, the oil sludge blocks a lubricating gap, so that fresh grease is difficult to enter the lubricating gap, the reaction is the pipeline pressure in a corresponding lubricating pipeline, and finally the concentrated lubricating system cannot normally run;

2. some mechanical equipment, such as engineering machinery, has very bad working environment, and a lubrication pipeline arranged on the equipment is damaged by being knocked by on-site gravel, stones and the like due to insufficient protection, so that a centralized lubrication system cannot normally lubricate a lubricating grease filling point;

3. the pumped lubricating grease is thick, low in temperature, mixed with sundries and bubbles in the lubricating grease, poor in quality of the lubricating grease and other factors, so that the plunger of the distributor is easy to be blocked or even dead, and when mechanical equipment is not used due to long-time stagnation, the lubricating grease in the distributor is possibly dry and hard, and the distributor is blocked, so that a centralized lubrication system cannot be normally used;

based on the reasons, the acceptance of the centralized lubrication system in the customer is low, the customer has to stop using mechanical equipment every time of failure, then the emergency lubrication is carried out on the mechanical equipment by a grease gun or other filling equipment is purchased, the grease gun is used for filling various grease filling points, one gun of oil cannot meet the requirements of all grease filling points, the oil gun is repeatedly filled with oil, the operation is complicated and easy to pollute, the construction process is delayed, the labor intensity is high, and the shaft pin or shaft sleeve is often worn due to untimely lubrication due to different personnel quality; in addition, the filling equipment is inconvenient to purchase, and the construction process is greatly delayed because the general operation sites of engineering machinery are remote positions such as mines, fields and the like.

Disclosure of Invention

The invention aims to provide a method for filling lubricating grease into mechanical equipment with a plurality of friction pairs, which not only can normally lubricate but also can conveniently carry out emergency lubrication when a centralized lubrication system fails.

The technical scheme of the invention is as follows:

the method for filling the mechanical equipment with the lubricating grease comprises the following steps:

s10, at least two lubricating grease filling points are arranged on at least part of friction pairs of mechanical equipment to be lubricated, and a pressure oil filling cup is arranged on at least one lubricating grease filling point of each friction pair in the at least part of friction pairs;

s20, installing and arranging a centralized lubrication system on mechanical equipment to be lubricated, wherein the centralized lubrication system comprises a lubrication pump, a main oil way, a distributor and a branch oil pipe which are sequentially connected with each other, and the tail ends of the branch oil pipes are respectively communicated with a certain lubricating grease filling point of each friction pair;

s30, when the mechanical equipment to be lubricated runs, the lubrication pump is started to lubricate each friction pair of the mechanical equipment to be lubricated;

s40, an independent grease adding pipe is arranged on the mechanical equipment to be lubricated, and a grease nipple which can be matched and butted with the pressure grease cup is arranged at the tail end of the grease adding pipe; when the grease adding pipe is needed, the grease outlet of the lubricating pump is switched to be communicated with the front end of the grease adding pipe, the grease adding pipe is respectively and sequentially communicated with the grease pressing cups on the friction pairs of the mechanical equipment to be lubricated, and the lubricating pump is started to fill lubricating grease for the friction pairs through the grease adding pipe and the grease pressing cups.

Further, in S40, the grease adding pipe is communicated with the grease pressing cup, and then the lubrication pump is started and the grease discharging amount per unit time of the lubrication pump is increased.

Further, the two-line lubricating pump is selected as the lubricating pump, the main oil line is two, the two-line lubricating pump comprises a plunger pair for pumping lubricating grease and a reversing valve with at least four oil ports, the reversing valve is provided with two oil ports which are respectively communicated with the two main oil lines, the two oil ports can alternately discharge grease, a third oil port of the reversing valve is communicated with an outlet of the plunger pair, a fourth oil port of the reversing valve is communicated with an oil tank of the lubricating pump, the reversing valve is communicated with the oil ports of the two main oil lines and the outlet of the plunger pair form a grease outlet of the lubricating pump, and when a grease adding pipe is needed to be used, one of the grease outlets of the lubricating pump is connected with the front end of the grease adding pipe, and the two-line lubricating pump is controlled to discharge grease only through the grease adding pipe.

Further, the greasing pipe is an automatic return oiling reel.

Further, the single-line lubricating pump is selected as the lubricating pump, the main oil way is provided with one single-line lubricating pump, the single-line lubricating pump comprises a plunger pair for pumping lubricating grease and a reversing valve with at least three oil ports, the reversing valve is provided with one oil port which is communicated with the main oil way, the second oil port of the reversing valve is communicated with the outlet of the plunger pair, the third oil port is communicated with an oil tank of the lubricating pump, the reversing valve is communicated with the oil port of the main oil way and the outlet of the plunger pair form a grease outlet of the lubricating pump, and when a grease adding pipe is needed, one of the grease outlets of the lubricating pump is connected with the front end of the grease adding pipe, and the single-line lubricating pump is controlled to output grease only through the grease adding pipe.

Further, a three-way switching valve is arranged on the main oil way, the other outlet of the three-way switching valve is communicated with the greasing pipe, and the two states of connection of the lubricating pump and the distributor and connection of the lubricating pump and the greasing pipe are switched through the three-way switching valve.

Further, the main oil way is divided into a front section and a rear section which are connected through a quick connector, the front end of the greasing pipe is provided with the quick connector which is in fit connection with the quick connector on the front section of the main oil way, and the quick connector on the front section of the main oil way is connected with the quick connector on the rear section of the main oil way or the quick connector on the front end of the greasing pipe.

Further, a change-over switch for realizing the change-over of the lubricating pump between the large displacement and the small displacement is arranged on the lubricating pump, the lubricating pump is automatically in a small displacement state when started, and the lubricating pump is switched to a large displacement state through the change-over switch when connected with the greasing pipe.

Further, the change-over switch comprises a detection sensor for detecting the on-off of the lubricating pump and the greasing pipe or the main oil way and a control device for automatically realizing the switch between the large displacement and the small displacement according to the feedback of the detection sensor.

Further, the controller of the lubrication pump comprises a wireless communication module, and when the lubrication pump is connected with the greasing pipe, a switching instruction is sent to the wireless communication module of the controller through the remote terminal so as to switch to a large-displacement mode.

The invention has the beneficial effects that: when the method for filling the lubricating grease into the mechanical equipment with the plurality of friction pairs is used, not only can most lubrication points be automatically and intensively lubricated, and the lubricating grease is filled into each lubrication point at fixed time and fixed quantity, but also the lubricating pump can be used as an electric oiling machine when various faults occur in the system, and the lubricating grease is filled into each lubrication point one by adopting a grease filling pipe, so that good lubrication of the friction pairs can be ensured in a fault emergency state, and the lubricating grease can be filled into some lubrication points inconvenient to carry out centralized lubrication.

Drawings

FIG. 1 is a schematic diagram of a centralized lubrication system in example 1 of a method of greasing a mechanical device having multiple friction pairs according to the present invention;

FIG. 2 is a schematic diagram of the lubrication pump of FIG. 1;

FIG. 3 is a schematic diagram of a centralized lubrication system in example 2 of the method of greasing a mechanical device having multiple friction pairs of the present invention;

FIG. 4 is a schematic diagram of a centralized lubrication system in example 5 of the method of greasing a mechanical device with multiple friction pairs of the present invention;

FIG. 5 is a schematic diagram of a centralized lubrication system in example 6 of the method of greasing a mechanical device with multiple friction pairs of the present invention;

FIG. 6 is a schematic diagram of the lubrication pump of FIG. 5;

FIG. 7 is a schematic diagram of a centralized lubrication system in example 7 of a method of greasing a mechanical device having multiple friction pairs according to the present invention;

FIG. 8 is a schematic diagram of a centralized lubrication system in example 8 of a method of greasing a mechanical device having multiple friction pairs according to the present invention;

FIG. 9 is a schematic diagram of a centralized lubrication system in example 9 of a method of greasing a mechanical device having multiple friction pairs according to the present invention;

FIG. 10 is a schematic diagram of a centralized lubrication system in embodiment 10 of the method of greasing a mechanical device having multiple friction pairs of the present invention;

FIG. 11 is a schematic diagram of a centralized lubrication system in example 11 of a method of greasing a mechanical device having multiple friction pairs according to the present invention;

FIG. 12 is a schematic diagram of the lubrication pump of FIG. 11;

in fig. 1, 2, 4: the lubrication device comprises a 2-lubrication pump, a 21-barrel cover, a 22-buckle, a 23-speed reducing motor, a 26-mechanical reversing valve, a 27-guiding sliding sleeve, a 28-controller, a 3-lubricating grease barrel, a 30-overflow valve, a 4-automatic return oiling reel, a 40-differential pressure switch, a 5-double-line distributor, a 6-progressive distributor, a A, B, a P, a T, a C, a 7-two-position three-way switching valve, wherein the P is a main oil way, the T is a grease return port, the C is a branch oil pipe leading to a lubrication point;

in fig. 3: 1-a lubricating pump, 11-an oil tank, 21-a main oil way front section, 22-a main oil way rear section, 23-a quick connector, 3-a grease adding pipe, 31-a quick connector, 32-a grease filling nozzle, 4-a distributor, 41-a branch oil pipe, 5-a friction pair, 51-a grease filling point and 52-a pressure grease filling cup;

in fig. 5-7: the device comprises a 21-barrel cover, a 22-buckle, a 23-speed reducing motor, a 26-reversing valve mechanism, a 27-guiding sliding sleeve, a 28-controller, a 3-lubricating grease barrel, a 4-automatic return oiling reel, a 5-three-way joint, a 6-single line distributor, wherein A is a main oil way, C is a branch oil pipe leading to a lubricating point, P is a grease inlet, T is a grease return port, a 7-two-position three-way switching valve, a 10-quick-plug oil pipe joint and a 30-overflow valve;

in fig. 8-10: the device comprises a 2-lubrication pump, a 21-barrel cover, a 22-buckle, a 24-pump seat, a 27-guiding sliding sleeve, a 28-controller, a 3-lubricating grease barrel, a 4-automatic return oiling reel, a 6-progressive distributor, a 7-two-position three-way switching valve, wherein A is a main oil way, C is an oil pipe leading to a lubrication point, and the device comprises a 9-electromagnetic switching valve and a 10-quick-plugging oil pipe joint;

In fig. 11-12: the device comprises a 2-lubricating pump, a 22-buckle, a 23-speed reducing motor, a 26-plunger pair, a 27-guiding sliding sleeve, a 28-controller, a 3-lubricating grease barrel, a 4-automatic return oiling reel, a 5-two-wire distributor, a 6-progressive distributor, A, B, a main oil way, a, b, an external lubricating grease port, P, a grease inlet, T, a grease return port, C, a branch oil pipe leading to a lubricating point, a 7-two-position three-way switching valve, a 9-breaking hammer and a 30-overflow valve.

Detailed Description

Example 1 of the method of greasing a mechanical device with multiple friction pairs of the present invention:

firstly, at least two lubricating grease filling points are arranged on at least part of friction pairs of mechanical equipment to be lubricated, and a grease pressing cup (a grease nipple) is arranged on at least one lubricating grease filling point of each friction pair in the at least part of friction pairs; the mechanical equipment to be lubricated refers to mechanical equipment to be lubricated, is a lubricating object, such as engineering machinery of an excavator, a loader, a rotary drill and the like, and also can be mechanical equipment at ports, wharfs, production lines and the like, and the friction pair is a combination pair of moving parts of the mechanical equipment, such as a position between a rotating shaft and a shaft hole, a position between an inner ring and an outer ring of a bearing and a roller, a position between gears and the like. The lubrication point filling point is a filling position which is arranged on the friction pair and used for filling lubricating grease into the friction pair to lubricate the friction pair, and generally comprises an oil port and an oil duct communicated to the inside of the friction pair. In all friction pairs, two filling points can be provided on one part, while the other part is provided with only one or no filling points. However, in the friction pair provided with at least two grease filling points, at least one grease filling point is provided with a pressure grease cup, namely a grease nipple, wherein the grease nipple is a one-way valve, and when the grease nipple of the grease gun is in butt joint with the grease nipple, the grease nipple is conducted so as to allow grease to enter; when the grease nipple is separated from the grease nipple, the one-way valve in the grease nipple is automatically closed, so that the grease nipple is blocked.

Then, a centralized lubrication system is installed and arranged on the mechanical equipment to be lubricated, as shown in fig. 1, the centralized lubrication system comprises a lubrication pump 2, a main oil way A, B, a distributor and a branch oil pipe C which are sequentially connected with each other, and the tail ends of the branch oil pipes are respectively communicated with a certain lubricating grease filling point of each friction pair. In this embodiment, the centralized lubrication system is a two-wire centralized lubrication system with two alternative grease outlet pipelines, the lubrication pump is a two-wire lubrication pump 2, and the centralized lubrication system is of a heavy barrel type structure, two main oil paths are respectively A, B, and the distributor comprises a two-wire distributor 5 connected to the main oil path and a progressive distributor 6 connected to an outlet of the two-wire distributor 5.

Specifically, the lubricating pump 2 comprises a barrel cover 21 for covering the lubricating grease barrel 3, the outer periphery of the barrel cover 21 is provided with a connecting structure for being detachably connected with the lubricating grease barrel 3, the lubricating grease barrel 3 is replaced by disassembling and assembling the connecting structure, and the barrel cover 21 is matched with a guide sliding sleeve 27 to play a bearing, fixing and guiding role on a pump seat. As shown in fig. 2, the lubrication pump 2 includes a barrel cover 21, a buckle 22, a gear motor 23, a pump seat, an annular sealing member, a mechanical reversing valve 26, a guide sliding sleeve 27, and a controller 28. When the lubricating pump is used, the lubricating pump is covered on the lubricating grease barrel through the barrel cover, and is buckled on the annular downward turning edge outside the barrel edge of the lubricating grease barrel through the buckle, the buckle has elasticity, the barrel cover and the lubricating grease barrel are ensured to be fixed into a whole after being buckled, the barrel cover can be used as a fixed support, a pump seat, a gear motor and the like can move up and down relative to the barrel cover through the guide sliding sleeve, the grease inlet of the plunger auxiliary assembly can be in direct contact with lubricating grease in the lubricating grease barrel, and the pump seat also descends along with the descending of the liquid level in the lubricating grease barrel.

The working principle of the lubricating pump is shown in fig. 2: after the power is turned on, the gear motor 23 starts to operate, the transmission shaft drives the eccentric wheel or the cam and plunger assembly to suck grease from the grease barrel 3 and send the sucked grease into the mechanical reversing valve 26 through the grease inlet P, the grease enters the main oil way of the lubricating system A through the mechanical reversing valve 26, and the grease in the main oil way B in the lubricating system reversely enters the grease barrel 3 through the grease return port T through the mechanical reversing valve 26 for unloading. When the pressure of the main oil way A reaches the reversing pressure or the running time reaches the time set by the controller 28, a pressure maintaining stage is entered, the gear motor 23 is ended to rotate reversely in the pressure maintaining stage, the gear motor 23 rotates reversely to drive the mechanical reversing valve 26 to reverse, the mechanical reversing valve 26 is switched to another valve position, P in the valve position is communicated with B, A is communicated with T, at the moment, the lubricating grease output from the mechanical reversing valve 26 enters the main oil way B through the grease inlet P, and the lubricating grease of the main oil way B flows back to the lubricating grease barrel 3 through the grease return port T for unloading. After the pressure of the main oil line B reaches the reversing pressure or the running time reaches the time set by the controller 28, the pressure maintaining stage is started, the speed reducing motor 23 is ended to perform reverse rotation for 5 seconds for unloading, and then the rest state is started. If the pressure in the main oil passage rises to the opening pressure of the relief valve 30 during operation of the gear motor 23, after which the main oil passage pressure is maintained at the opening pressure of the relief valve 30 and excess grease overflows back to the grease barrel 3 via the relief valve 30, the system pressure is maintained at the pressure value set by the relief valve 30.

In other embodiments, the relief valve 30 may be replaced by a relief valve, and the usage of the relief valve is substantially the same as that of the relief valve, and the description thereof will be omitted. Of course, the relief valve may be replaced by an oil pressure switch or an oil pressure sensor, and the oil pressure switch may be disposed on an oil path between the oil outlet and the oil inlet, or may be disposed on two main oil paths, respectively. The oil pressure switch can control the pump to stop when detecting that the pressure reaches the set maximum pressure, the oil pressure sensor can feed back the detected pressure value to the controller, and the controller compares the detected pressure value with the set value, and if the detected pressure value reaches the set value, the oil pressure sensor controls the pump to stop.

The centralized lubrication system of this embodiment operates along with the operation of the mechanical equipment to be lubricated, because the friction pairs generally only need to be lubricated when the equipment is in operation, after the lubrication pump is started, the gear motor drives the plunger pair to move so as to suck the lubricating grease in the oil tank of the plunger pair and pump the lubricating grease out after passing through the mechanical reversing valve, and the lubricating grease respectively flows to each corresponding friction pair after being distributed by the two-wire distributor and the progressive distributor on the main oil path.

Subsequently, a separate greasing pipe is arranged on the mechanical equipment to be lubricated, and a grease nipple which can be matched and butted with the pressure grease cup, such as a flat-head grease nipple, is arranged at the tail end of the greasing pipe; when the grease adding pipe is needed, for example, when the parts of the centralized lubrication system except the lubrication pump are damaged or some lubrication points inconvenient to perform centralized lubrication and only capable of being manually lubricated are needed to be lubricated, the grease outlet of the lubrication pump is switched to be communicated with the front end of the grease adding pipe, the switching mode can be a three-way switching valve or a quick-plug connector, the grease adding pipe is respectively communicated with the pressure grease adding cups on all friction pairs of mechanical equipment to be lubricated in sequence, and the lubrication pump is started to fill lubricating grease for all friction pairs through the grease adding pipe and the pressure grease adding cups. Specifically, when the distributor or the pipeline of the lubrication system fails, for example, the lubrication pipeline is damaged by accidental impact of on-site ore, the two-position three-way switching valve 7 on the main oil path B can be switched to be communicated with the self-return oiling reel, meanwhile, the controller 28 controls the motor to rotate reversely all the time, so that only the oil outlet of the oil path B is ensured, the rotating speed of the motor is improved, the grease discharging amount per unit time of the lubrication pump is improved, grease is discharged in a high-speed mode, and a driver can use the oil gun of the self-return oiling reel 4 to fill grease for each lubrication point, so that rescue lubrication under emergency is realized.

In this embodiment, when the lubrication pump is switched from the state of being connected to the distributor to the state of being connected to the grease adding pipe, the controller of the lubrication pump is provided with a manual one-key switching mode, i.e. after the key is pressed, the controller can be controlled to execute a command of switching modes, at this time, the speed reducing motor of the double-wire lubrication pump does not reciprocate forward and backward any more, but only rotates reversely to provide grease for the main oil way B, and the controller also controls the speed reducing motor to run at a faster speed, so that the grease output amount in unit time is improved. In other embodiments, a detection sensor for detecting the state of the two-position three-way switching valve can also be arranged on the system, and when the two-position three-way switching valve is detected to be communicated with the greasing pipe, the command of executing the high-speed operation of the motor and only discharging grease from the main oil way B is fed back to the controller, so that the full-automatic switching is realized; or, a wireless communication module is arranged on the controller, and an operator sends a mode switching instruction through a remote terminal such as a mobile phone or a computer so as to control the motor to execute the corresponding instruction.

Specifically, as shown in fig. 1, the automatic return oiling reel 4 of the centralized lubrication system, the automatic return oiling reel 4 comprises a reel bracket and a coiled oiling pipe, one of the first external lubricating grease opening A, B and the second external lubricating grease opening A, B is connected with a three-way switching valve 7, the other two paths of the three-way switching valve 7 are respectively communicated with one inlet of a distributor and the oiling pipe, the other end of the oiling pipe is provided with an oiling gun which can be used for being in plug-in fit with a lubricating nipple of a point to be lubricated, and one of the first external lubricating grease opening and one of the oiling pipe and the distributor can be selectively conducted through the three-way switching valve 7. In other embodiments, the self-return fuel supply reel can be replaced by a hand-operated return fuel supply reel, and the fuel supply reel is wound by a crank.

In other embodiments, one of the first and second external grease ports is connected with a pump seat quick connector, the double-line centralized lubrication system further comprises an automatic return oiling reel, the automatic return oiling reel comprises a reel bracket and a coiled oiling pipe, one end of the oiling pipe is provided with a reel quick connector which can be matched with the pump seat quick connector in an adapting mode, the other end of the oiling pipe is provided with a oiling gun which can be matched with a grease nipple of a point to be lubricated in an adapting mode, one inlet of the distributor is connected with a distributor quick connector which can be matched with the pump seat quick connector in an adapting mode, and the pump seat quick connector is optionally connected with one of the distributor quick connector and the reel quick connector.

In this embodiment, the lubrication pump 2 further includes a pressure switch for detecting the oil pressure of the main oil passage to control the drive device to stop operating when the set pressure is reached, and in other embodiments, the lubrication pump 2 includes a relief valve connected to the main oil passage, or the lubrication pump 2 includes a relief valve 30 connected to the main oil passage. Any one of the pressure switch, the safety valve and the overflow valve 30 has the function of protecting the main oil way, preventing the occurrence of fatal faults such as damage to the oil pipe or the lubricating pump 2 caused by overlarge pressure in the main oil way, and controlling the oil pressure of the main oil way not to exceed the maximum safety pressure; wherein the pressure switch can be fed back to the controller to control the lubrication pump 2 to stop when the overpressure is applied, and the relief valve 30 can be overflowed to prevent the oil pressure from increasing continuously when the overpressure is applied.

It should be noted that: the friction pairs are all friction pairs needing to be filled with lubricating grease. The two oil ports of the reversing valve are alternately used for discharging grease, namely, when one oil port discharges grease, the other oil port does not discharge grease, but returns grease, and the grease discharging process of one oil port can be divided into a plurality of times, the alternation of the two oil ports is based on reversing actions of a reversing valve core of a double-wire distributor or a single-wire distributor, namely, when the reversing valve core is reversed, the two oil ports are switched to the other oil port for discharging grease, and when the reversing valve core is not reversed, the grease discharging oil port is treated as once no matter how many times of grease is discharged.

Example 2 of the method of greasing a mechanical device with multiple friction pairs of the present invention: the difference from embodiment 1 is that a single line centralized lubrication system is installed and arranged on the mechanical equipment to be lubricated, and as shown in fig. 3, the system includes a single line lubrication pump 1, a single line distributor 4, one main oil line, a greasing pipe 3, a plurality of branch oil pipes 41, and the like. The single-line lubrication pump 1 is in the prior art, as shown in fig. 6, and comprises an oil tank 11 and a pump head, wherein a gear motor, a transmission mechanism, a plunger pair and a two-position three-way reversing valve are arranged in the pump head, the two-position three-way reversing valve is provided with three oil ports, one oil port is communicated with a main oil way and is used for discharging grease or returning grease, the second oil port of the reversing valve is communicated with an outlet of the plunger pair, the third oil port is communicated with the oil tank 11 of the lubrication pump 1, and the reversing valve is communicated with the oil port of the main oil way and the outlet of the plunger pair to form a grease outlet of the lubrication pump 1. The main oil way is divided into a front section and a rear section which are connected through a quick connector, the front end of the greasing pipe 3 is provided with the quick connector which is matched and spliced with the quick connector on the front section of the main oil way, and the quick connector on the front section of the main oil way is connected with the quick connector on the rear section of the main oil way or connected with the quick connector on the front end of the greasing pipe 3. When the lubricating oil pump is used, during normal lubrication, the front section and the rear section of the main oil pipe are in butt joint through corresponding quick connectors, under the control of a controller of the lubricating pump 1, the gear motor drives the plunger to reciprocate linearly through the eccentric wheel mechanism, the lubricating grease in the oil tank 11 is pumped to the two-position three-way reversing valve, at the moment, the reversing valve is in a state of enabling an outlet of the plunger pair to be communicated with a main oil way, lubricating grease enters the single-wire distributor 4 after entering the main oil way, the reversing valve core in the single-wire distributor 4 moves to the rear end, so that the front end of the reversing valve core is communicated with a cavity at the front end of the metering valve core, the lubricating grease enters the front end of the metering valve core to push the metering valve core to move to the rear end of the metering valve core, and the lubricating grease stored at the rear end of the metering valve core in a cycle is pumped out, and flows into the corresponding friction pair 5 through the branch pipe; then the gear motor of the lubricating pump 1 stops running, the two-position three-way switching valve is controlled to be switched to a valve position where a main oil way is communicated with the oil tank 11, a spring at the rear end of the metering valve core in the single-wire distributor 4 pushes the metering valve core to move from the rear end to the front end, grease at the front end of the metering valve core is pushed to move towards the rear end of the reversing valve core, the reversing valve core is pushed to move towards the front end, and then the grease at the rear end of the reversing valve core enters the rear end of the metering valve core through the bypass oil way to be stored, and in the process, a small amount of grease in the main oil way reversely flows and flows back to the oil tank 11 after passing through the two-position three-way reversing valve. When the part of the centralized lubrication system except the lubrication pump 1 fails or some reserved lubrication points which are needed to be filled with grease by manual lubrication, the front section and the rear section of the main oil way are manually pulled out, the front end of the main oil way is connected with the quick connector at the front end of the grease adding pipe 3 through the quick connector, the grease adding pipe 3 is connected with the pressure grease cup 52 at the lubrication points which are needed to be manually lubricated through the grease adding nozzle 32 at the rear end of the grease adding pipe, and the controller is controlled to continuously operate without unloading by means of intelligent switching and the like through keys, wireless remote control or detection of a detection sensor, and the rotating speed of the motor is increased to increase the grease discharging amount per unit time, so that grease can be filled into the lubrication points which are needed to be manually lubricated at a higher speed than centralized lubrication.

Example 3 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 1 is that, as shown in fig. 4, two main oil paths a and B of the two-wire lubrication pump 2 are respectively provided with a progressive distributor 6, and the two main oil paths a and B are in a main-sub progressive structure, namely, the distributor is a progressive distributor 6, and the two main progressive distributors 6 and at least two sub progressive distributors 6 comprise two main progressive distributors 6, wherein inlets of the two main progressive distributors 6 are respectively communicated with a first external lubricating grease port and a second external lubricating grease port, and at least one sub progressive distributor 6 is respectively connected to one outlet of the two main progressive distributors 6. In the working process, the progressive distributor is continuously and circularly progressive for discharging grease, and no unloading process exists, so that the centralized lubrication system alternately supplies grease to the main oil ways A and B for discharging grease, and the grease is not required to be returned to the main oil ways B when the grease is supplied to the main oil ways A.

Example 4 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 2 is that, as shown in fig. 5, a two-position three-way switching valve 7, which is the same as that of embodiment 1, is provided on the main oil passage to switch between communication of the lubrication pump with the main oil passage and communication with the filler pipe. The three single-line distributors 6 on the main oil path are connected in parallel, and synchronously discharge grease or unload grease back. The working principle of the adopted lubricating pump is shown in fig. 6, a gear motor 23 starts to operate after the power supply is connected, a transmission shaft drives an eccentric wheel and a plunger assembly to absorb oil from the lubricating grease barrel 3 and send the absorbed lubricating grease into a reversing valve mechanism 26 (namely a two-position three-way switching valve 7 driven by electromagnetic waves) through a grease inlet P, the reversing valve mechanism 26 is a two-position three-way reversing valve, and the lubricating grease enters a main oil way A of a lubricating system through the reversing valve mechanism 26, then enters a single-wire distributor 6 or a grease adding pipe of the automatic return oiling reel 4, and then enters a lubricating point. When the pressure of the main oil path a reaches the set pressure or the running time reaches the time set by the controller 28, the pressure maintaining stage is entered, the gear motor 23 stops rotating and pressure is released, meanwhile, the controller controls the reversing valve mechanism 26 to start reversing (the reversing valve mechanism can adopt an electromagnetic reversing valve to perform reversing by power failure), and the valve is switched to a second valve position, when the valve position is at the valve position, the main oil path a is communicated with the grease return port T, the grease inlet P is disconnected, the grease in the main oil path a flows into the grease barrel 3 through the grease return port T, and then the second cycle is continuously performed to alternately perform the grease beating and unloading processes.

Example 5 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 4 is that, as shown in fig. 7, the lubrication pump 2 is switched between the single-line dispenser 6 and the filler pipe of the self-returning filler reel 4 by means of a quick-connect coupling 10. Namely, a pump seat quick connector 10 is connected to a pipeline connected with an external lubricating grease port, the single-wire centralized lubrication system further comprises an automatic return oiling reel 4, the automatic return oiling reel 4 comprises a reel bracket, a coiled greasing pipe and an automatic contraction mechanism for providing driving force for automatic coiling of the greasing pipe, one end of the greasing pipe is provided with the reel quick connector 10 which can be matched with the pump seat quick connector in an adapting manner, the other end of the greasing pipe is provided with a greasing gun (a grease nipple) which can be matched with a grease nipple to be lubricated in an adapting manner, an inlet of the single-wire distributor 6 is connected with the distributor quick connector 10 which can be matched with the pump seat quick connector 10 in an adapting manner, and the pump seat quick connector can be selectively connected with one of the distributor quick connector and the reel quick connector. When in use, during normal lubrication, the lubrication pump 2 is in butt joint with the quick joint of the distributor through the quick joint of the pump seat so as to normally supply lubricating grease for the single-wire distributor 6 and a pipeline thereof, and when the single-wire distributor 6, the pipeline and the like fail, the quick joint of the pump seat can be in butt joint with the quick joint of the reel, so that the automatic return oiling reel 4 is utilized for emergency lubrication.

Example 6 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 3 is that, as shown in fig. 8, the installed centralized lubrication system is a main-sub progressive centralized lubrication system, the lubrication pump is a progressive lubrication pump, the lubrication pump has a grease outlet and can continuously supply grease, and a two-position four-way switching valve or a two-position three-way switching valve is not arranged in the lubrication pump, specifically: the progressive centralized lubrication system includes a lubrication pump, progressive distributor 6, controller 28, self-retracting refuel reel 4, and tubing. The lubrication pump comprises a barrel cover 21, a driving device, a pumping mechanism, an annular sealing element and a guiding sliding sleeve 27. The driving device is a speed reducing motor; the pumping mechanism comprises a pump seat 24 and a plunger sub-assembly which is arranged on the pump seat 24 and driven by the driving device, wherein the plunger sub-assembly is provided with a grease outlet for discharging grease and a grease inlet for sucking the grease in the grease barrel 3, the pump seat 24 is also provided with an annular sealing element which is in sliding sealing fit with the inner wall of the grease barrel 3, and the annular sealing element slides downwards along with the descending of the liquid level of the grease in the grease barrel. The annular sealing member is sleeved on the pump seat 24, and the annular sealing member and the pump seat 24 form a pressure oil structure for sealing and covering the lubricating grease in the lubricating grease barrel. The oiling reel 4 comprises a reel bracket and a coiled oiling pipe, wherein one end of the oiling pipe is provided with an oiling gun which can be used for being in plug-in fit with a grease nipple at a point to be lubricated. The gear motor is fixed relative to the pump mount 24; the upper end of the guiding sliding sleeve 27 is connected with the barrel cover 21 and is used as a guiding member for the pumping mechanism to move relative to the barrel cover 21 so as to limit the movement of the guiding sliding sleeve along the central axis direction of the lubricating grease barrel 3, and the guiding sliding sleeve 27 comprises a sliding sleeve section or at least two sliding sleeve sections which are in telescopic sliding fit with each other along the central axis direction of the lubricating grease barrel 3.

In this embodiment, a safety valve is connected to the grease outlet or a pipe to which the grease outlet is connected, and the other outlet of the safety valve is used for communicating with the grease barrel 3. The grease outlet is connected with a quick connector 10, and in other embodiments, a three-way switching valve can be replaced to switch the connection between the lubrication pump and one of the two. The quick connector of the pump seat 24 and the arrangement of the three-way switching valve enable the lubricating pump to be connected with the automatic return oiling reel 4 besides being used as a power source of a centralized lubricating system, and the automatic return oiling reel 4 is used as an emergency means for oiling lubrication points when a pipeline or a distributor of the centralized lubricating system fails, so that the electric grease gun is realized.

The lubrication pump further comprises a controller 28 for controlling the start, stop and speed regulation actions of the driving device according to set control logic, the controller 28 is arranged on the barrel cover 21, and the controller 28 is provided with a man-machine interaction module so as to conveniently adjust parameters of the lubrication pump according to different working conditions.

In this embodiment, the progressive distributor 6 has a plurality of stages and is divided into at least two stages, wherein the inlet of the progressive distributor 6 of the first stage is connected with the lipid outlet, and the inlet of the progressive distributor 6 of the subsequent stage is communicated with the outlet of the progressive distributor 6 of the previous stage. As shown in fig. 4, it includes a main dispenser and four sub dispensers, which are progressive dispensers 6. The rest of grease outlets of the main distributor cover a plurality of lubrication points at the root and the upper part of the big arm of the excavator 1, the grease outlets of the four sub progressive distributors 6 are respectively used for filling lubricating grease into the rest of lubrication points such as a bucket rod, an oil cylinder, a connecting rod, a horse head and the like, and the displacement of the grease outlets of the corresponding progressive distributors 6 is matched with the lubrication points with different grease requirements on the excavator 1. The specific mode is realized by adopting the combination of the sheet type distributor sheets with different displacement.

In this embodiment, the working principle of the lubrication pump is as follows: after the power is turned on, the gear motor starts to operate, the transmission shaft drives the eccentric wheel and the plunger assembly to absorb oil from the lubricating grease barrel 3, the absorbed lubricating grease enters a main oil way A of the lubricating system through the grease outlet, then enters the progressive distributor 6 or the automatic return oiling reel 4, and then enters a lubricating point. After the lubricating pump drives lubricating grease into the main oil way A, the lubricating grease firstly enters the main progressive distributor, each plunger in the main progressive distributor sequentially circulates to realize the circulation grease outlet of each grease outlet, one part of the grease outlet of the main progressive distributor is connected with the sub progressive distributor, and the other part of the grease outlet of the main progressive distributor can be directly communicated with a lubricating point near the big arm through the branch oil pipe so as to be directly lubricated. The grease coming out of the main progressive distributor enters the sub progressive distributor through the lubricating pipe, and the grease still passes through the alternate circulation action of each plunger in the sub progressive distributor, so that each grease outlet of the sub progressive distributor is cyclically replaced by grease, and the grease outlet of the sub progressive distributor is directly connected to each lubricating point position on the excavator through the branch oil pipe, so that the grease is provided for the friction pairs corresponding to the points, and the good lubrication of the friction pairs is ensured. After the countdown of the controller is finished, the grease injection activity at the stage is finished, the lubricating pump enters a rest stage, and when the next cycle is reached, the lubricating pump is continuously started and the same grease injection action is continuously carried out.

Example 7 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 6 is that, as shown in fig. 9, a three-way switching valve 7 is employed as a switching means to effect switching between the lubrication pump and the main oil passage communication or between the lubrication pump and the filler pipe communication. Each electromagnetic switch valve 9 corresponds to a branch oil pipe, and the controller 28 can independently control the on-off state, the on-off time, the on-off sequence and the like of each electromagnetic switch valve 9. When the controller 28 controls the corresponding electromagnetic switch valve 9 to be conducted, the corresponding branch oil pipe is conducted. In fig. 5, three electromagnetic switch valves 9 are shown, each electromagnetic switch valve 9 comprises an on-off valve position and an on-off valve position, each electromagnetic switch valve 9 corresponds to one branch oil pipe, the branch oil pipe can be directly connected to a lubrication point or is connected with a progressive distributor 6, in fig. 9, the three branch oil pipes are respectively connected with the progressive distributor 6, each progressive distributor 6 can supply lubricating grease for each lubrication point through a plurality of outlets and corresponding lubrication pipes, and each electromagnetic switch valve 9 can be independently controlled by a controller 28.

Example 8 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 7 is that the electromagnetic switch valve is replaced with a two-position three-way switch valve 7 as shown in fig. 10, and the two-position three-way switch valve 7 may be a solenoid valve or a manual valve. Two oil outlet circuits of the two-position three-way switching valve 7 are respectively connected with one progressive distributor 6, and the main oil circuit is switched on and off with one progressive distributor 6 through the two-position three-way switching valve 7. In other embodiments, a quick oil pipe joint with a check valve may be also provided on one of the oil outlet circuits of the oil distribution switching valve, so as to facilitate the supply of grease to the newly added lubrication point.

Example 9 of the method of greasing a mechanical device with multiple friction pairs of the invention: the difference from embodiment 1 is that, as shown in fig. 11, the lubrication pump in this embodiment is a dual-plunger lubrication pump, two plungers respectively correspond to one main oil path, and in other embodiments, a multi-plunger lubrication pump, for example, three plunger pairs, may be replaced, where two plungers are combined and correspond to one main oil path, and the other plunger pair individually corresponds to the other main oil path. The lubrication pump comprises a reversing valve mechanism, the reversing valve mechanism comprises a three-way reversing valve 7 and a reversing module, the three-way reversing valve 7 comprises a grease inlet P communicated with a grease outlet of one plunger pair 26, a grease return port T used for communicating the grease barrel 3 and an external grease port, and under the control of the two reversing modules: when one reversing valve mechanism is in a communication state of the grease inlet P and the external lubricating grease outlet a, the other reversing valve mechanism is in a communication state of the external lubricating grease outlet b and the grease return port T, so that one way of grease supply and the other way of grease return are realized; at least one of the external lubricating grease ports a and b and the grease outlet is connected with a pump seat quick connector or a three-way switching valve 7.

The two-wire centralized lubrication system also includes a self-return service reel 4, which in other embodiments may be a hand-operated service reel that is wound by shaking with a crank. The self-return oiling reel 4 comprises a reel bracket, a coiled oiling pipe and an automatic contraction mechanism for providing the automatic coiling driving force for the oiling pipe, wherein a three-way switching valve 7 is connected to the oiling outlet of one plunger pair 26, the other two paths of the three-way switching valve 7 are respectively communicated with one inlet of the double-wire distributor 5 and the oiling pipe, the other end of the oiling pipe is provided with an oiling gun which can be used for being in plug-in fit with an oiling nozzle at a point to be lubricated, and the external lubricating grease outlet can be selectively communicated with one of the oiling pipe and the double-wire distributor 5 through the three-way switching valve 7.

In this embodiment, the lubrication pump 2 operates as follows: as shown in fig. 12, after the power is turned on, the gear motor 23 starts to operate, the transmission shaft drives the eccentric wheel or the cam to rotate, the eccentric wheel or the cam drives the two plunger pairs 26 to act, because the oil suction port of the pump seat is in contact with the lubricating grease in the lubricating grease barrel 3, the lubricating grease is sucked from the lubricating grease barrel 3, the lubricating grease enters from the oil inlet of the plunger pair 26 and is pumped out from the oil outlet, and then enters the main oil path to be pumped out after passing through the overflow valve 30, the two plunger pairs 26 simultaneously discharge the lubricating grease, under the coordination of the two-position three-way switching valves 7 on the main oil path, the two-position three-way switching valves 7 are electromagnetic valves, as shown in fig. 11, at the moment, the two-position three-way switching valves 7 on the main oil path B are switched to the oil inlet P to be communicated with the outer port B, so that the lubricating grease is pumped to the double-wire distributor 5 and the progressive distributor 6, and at the same time, the controller 28 controls the two-position three-way switching valve 7 on the main oil way A to be switched into the connection state of the grease return port T and the external grease port a, so that the grease at the downstream of the main oil way A is unloaded into the grease barrel 3 through the grease return port T, the grease inlet P of the two-position three-way switching valve 7 at the upstream of the main oil way A is in a disconnection state, so that the grease at the upstream of the main oil way A is continuously boosted, the overflow channel is opened after the set pressure of the overflow valve 30 is reached, the grease at the upstream of the main oil way A flows back into the grease barrel 3 from the overflow channel, otherwise, when the main oil way A supplies grease, the two-position three-way switching valve 7 on the main oil way A is in the connection state of the grease inlet P and the external grease port a, the two-position three-way switching valve 7 on the main oil way B is in the connection state of the grease return port T and the external grease port B, the grease at the two-position three-way switching valve 7 supplies grease to the two-way distributor 5 and the progressive distributor 6, the grease at the upstream of the main oil path B returns to the grease barrel 3 through the relief valve 30, and the grease at the downstream of the main oil path B flows into the grease barrel 3 through the grease return port T.

When the novel lubricating grease barrel is used, when the lubricating grease barrel 3 is not provided with lubricating grease, the low liquid level alarm module alarms to prompt replacement, a driver lifts a barrel of novel lubricating grease and removes a dust cover on the lubricating grease barrel 3, at the moment, the driver releases a buckle on the barrel cover of the lubricating pump 2 from the lubricating grease barrel 3, the lubricating pump 2 is pulled out from an empty barrel, the empty barrel is replaced by the novel lubricating grease barrel 3 just, a pressure oil disc of a pump seat of the lubricating pump 2 is placed in the novel lubricating grease barrel 3, sealing sliding fit between an annular sealing piece and the inner wall of the barrel is ensured, the barrel cover is covered on the lubricating grease barrel 3, and the buckle is buckled on the barrel edge of the lubricating grease barrel 3 through the buckle, so that the connecting process is completed, and then the novel lubricating grease barrel can be lubricated normally. When the excavator works, firstly, the oil is discharged from the A path, the oil is returned from the B path, and the two-wire distributor 5 and the progressive distributor 6 are respectively supplied to lubrication points at the root part of the big arm, the bucket rod, the oil cylinder, the connecting rod 11 and the like of the excavator 1. After the set time is reached, the controller 28 controls the two-position three-way switching valves 7 to switch valve positions, at this time, the oil is discharged from the path B, the oil is returned from the path A, the working process is similar to the previous description, one working cycle is completed, the controller 28 stops running after completing the set number of working cycles according to the set time, and starts counting down, and the next cycle is started until the counting down is finished.

When the distributor or the pipeline of the lubrication system breaks down, for example, when the lubrication pipeline is damaged by accidental impact of on-site ore or when some lubrication points are needed to be lubricated manually, the two-position three-way switching valve 7 on the main oil way A can be switched to be communicated with the automatic return oiling reel, meanwhile, the controller 28 controls the two-position three-way switching valve 7 on the main oil way B to be in a state that a grease inlet is disconnected, so that only the main oil way A is ensured to be oiled, and a driver can use the oiling gun of the automatic return oiling reel 4 to fill lubricating points with lubricating grease, thereby realizing rescue lubrication under emergency.

As shown in fig. 11, when the excavator is replaced with the breaking hammer 9 by the excavator bucket, the lubrication pipeline reserved by the second two-wire distributor 5 is butted with the breaking hammer 9, so that the two-position three-way switching valve 7 at the most downstream is switched to be communicated with the breaking hammer 9, the breaking hammer 9 is supplied with grease through the outlet pipeline of the second two-wire distributor 5, and when the excavator is switched to work by the excavator bucket, the two-position three-way switching valve 7 at the most downstream is switched to be communicated with the progressive distributor 6, so that the grease supply amount at the connecting rod and the horse-head is increased.

Claims

1. A method of greasing a mechanical device having a plurality of friction pairs, comprising the steps of:

s40, an independent grease adding pipe is arranged on the mechanical equipment to be lubricated, and a grease nipple which can be matched and butted with the pressure grease cup is arranged at the tail end of the grease adding pipe; when the grease adding pipe is needed to be used, the grease outlet of the lubricating pump is switched to be communicated with the front end of the grease adding pipe, the grease adding pipe is respectively and sequentially communicated with the grease pressing cups on the friction pairs of the mechanical equipment to be lubricated, and the lubricating pump is started to be used for adding lubricating grease to the friction pairs through the grease adding pipe and the grease pressing cups;

the lubricating pump selects two double-line lubricating pumps, the main oil way is two, the double-line lubricating pump comprises a plunger pair for pumping lubricating grease and a reversing valve with at least four oil ports, the reversing valve is provided with two oil ports which are respectively communicated with the two main oil ways, the two oil ports can alternately discharge grease, a third oil port of the reversing valve is communicated with an outlet of the plunger pair, a fourth oil port is communicated with an oil tank of the lubricating pump, the reversing valve is communicated with the oil ports of the two main oil ways and an outlet of the plunger pair form a grease outlet of the lubricating pump, and when a grease adding pipe is needed to be used, one of the grease outlets of the lubricating pump is connected with the front end of the grease adding pipe, and the double-line lubricating pump is controlled to discharge grease only through the grease adding pipe.

2. The method for greasing a mechanical device having a plurality of friction pairs according to claim 1, wherein in S40, the grease adding pipe is communicated with the oil pressing cup to start the lubrication pump and increase the amount of grease discharged per unit time of the lubrication pump.

3. The method of greasing a mechanical device having a plurality of friction pairs of claim 1, wherein the grease tube is a self-retracting refueling spool.

4. The method for filling a mechanical device with lubricating grease according to claim 1 or 2, wherein the lubricating pump is a single-line lubricating pump, the main oil path is one, the single-line lubricating pump comprises a plunger pair for pumping lubricating grease and a reversing valve with at least three oil ports, the reversing valve is provided with one oil port communicated with the main oil path, the second oil port of the reversing valve is communicated with the outlet of the plunger pair, the third oil port is communicated with an oil tank of the lubricating pump, the oil port communicated with the main oil path of the reversing valve and the outlet of the plunger pair form a grease outlet of the lubricating pump, and when a grease adding pipe is needed, one of the grease outlets of the lubricating pump is connected with the front end of the grease adding pipe, and the single-line lubricating pump is controlled to output grease only through the grease adding pipe.

5. The method for filling a mechanical device with lubricating grease according to claim 1 or 2, characterized in that a three-way switching valve is provided on the main oil passage, the other outlet of the three-way switching valve is communicated with the grease adding pipe, and switching between the two states of connection of the lubrication pump and the distributor and connection of the lubrication pump and the grease adding pipe is achieved through the three-way switching valve.

6. The method for filling lubricating grease into mechanical equipment with a plurality of friction pairs according to claim 1, wherein the main oil way is divided into a front section and a rear section which are connected through a quick connector, the front end of the grease adding pipe is provided with the quick connector which is matched and spliced with the quick connector on the front section of the main oil way, and the quick connector on the front section of the main oil way is connected with the quick connector on the rear section of the main oil way or the quick connector on the front end of the grease adding pipe.

7. The method for filling a mechanical device with grease having a plurality of friction pairs according to claim 2, wherein a change-over switch for switching the lubrication pump between a large displacement and a small displacement is provided on the lubrication pump, the lubrication pump is automatically in a small displacement state when started, and is switched to a large displacement state by the change-over switch when the lubrication pump is connected with the grease filling pipe.

8. The method of greasing a mechanical device having a plurality of friction pairs according to claim 7, wherein the change-over switch includes a detection sensor for detecting on-off of the lubrication pump to the greasing pipe or to the main oil passage, and a control device for automatically switching between the large displacement and the small displacement based on feedback from the detection sensor.

9. The method of claim 7, wherein the controller of the lubrication pump includes a wireless communication module, and wherein the controller sends a switching command to the wireless communication module of the controller via the remote terminal to switch to the large displacement mode when the lubrication pump is connected to the grease pipe.