Multi-purpose adjustable plunger lubricating oil pump

Abstract

The present invention discloses a multi-purpose adjustable plunger lubricating oil pump, belonging to the technical field of lubrication pumps. The oil pump includes a main body, which is provided with an oil inlet and an oil outlet. The main body is provided with a drive cavity and N plunger holes evenly distributed around the circumference of the drive cavity, each of which has a plunger core rod installed in it. The oil pump also includes an impeller rotating shaft, on which N / 2 groups of driving impellers are evenly distributed around the circumference. The present invention uses an impeller rotating shaft to drive multiple plunger core rods to move back and forth simultaneously, achieving multiple oil output channels, and the oil volume of each channel can be independently adjusted, which can meet the lubrication needs of multiple channels with different oil volumes.

Description

Technical Field

[0001] The invention belongs to the technical field of lubrication pumps, and in particular relates to a multi-purpose adjustable plunger lubrication oil pump. Background Art

[0002] Oil-gas lubrication systems are commonly used lubrication devices in mechanical equipment. They usually consist of components such as an oil tank, an electrical control box, a lubricating oil pump, a progressive distributor, an oil-gas mixing block, and a distributor. This type of system is mainly used for targeted lubrication and testing of a small range of lubrication points. For example, the oil-gas circulation lubrication system disclosed in the Chinese utility model patent with authorization publication number CN214369194U includes an oil-gas circulation lubrication station, an air source, an oil-gas satellite station, a lubrication actuator, and oil supply, oil-gas, and return lines. Among them, the oil-gas satellite station distributes and mixes the lubricating oil through a progressive distributor and an oil-gas mixing block. The oil-gas circulation lubrication station is connected to the satellite station through a pipeline system, and the air source provides power to the system. Although this structure can achieve basic lubrication functions, its original design intention was to target multiple single-type lubrication points with similar lubricating oil requirements.

[0003] However, in actual applications, the existing oil-gas lubrication system still has the following defects:

[0004] 1. While distributors can fine-tune the oil volume at each lubrication point, the adjustment range is very limited, making it difficult to meet the differentiated lubrication needs of complex equipment. For example, a wind turbine's lubrication points include pitch bearings, open gears, main bearings, gearboxes, yaw system bearings, hydraulic brake systems, and generator bearings. Both open gears and gearboxes require gear oil for lubrication, but development gears require significantly more oil than gearboxes. Fine-tuning with distributors is difficult to simultaneously meet the lubrication needs of both.

[0005] 2. In some large systems, different lubrication points require different lubricants. Taking wind turbines as an example, they use a variety of lubricants, including grease, gear oil, and hydraulic oil. Currently, a multi-pump lubrication solution is commonly used for such complex systems, with separate oil-air lubrication systems configured for different lubricants. While this solution can address differentiated lubrication requirements, the simultaneous use of multiple oil pumps carries drawbacks such as high system costs, difficult maintenance, and challenging troubleshooting. Summary of the Invention

[0006] The present invention proposes a multi-purpose adjustable plunger lubricating oil pump, the purpose of which is: 1. to solve the problem that a single oil pump cannot output multiple lubricating media with different oil amounts at the same time; 2. to solve the problem that a single oil pump cannot pump multiple different lubricating media at the same time.

[0007] The technical solutions of the present invention are as follows:

[0008] A multi-purpose adjustable plunger lubricating oil pump comprises a body, the body being provided with an oil inlet and an oil outlet, the body being provided with a drive cavity, and N plunger holes uniformly distributed around the circumference of the drive cavity, each plunger hole being provided with a plunger core rod; N being an even number;

[0009] The plunger core rod comprises a threaded section, an optical axis section and a piston section which are sequentially connected from left to right, and also comprises an anti-rotation section for preventing the plunger core rod from rotating;

[0010] A limit nut is installed on the threaded section;

[0011] A plunger sleeve is sleeved on the outside of the optical axis section. The outer diameter of the optical axis section is smaller than that of the piston section, and the two form a shaft shoulder. The plunger sleeve moves between the limit nut and the shaft shoulder. A first bearing is installed on the plunger sleeve, and the axis of the first bearing is perpendicular to the axis of the plunger core rod.

[0012] The multi-purpose adjustable plunger lubricating oil pump further includes an impeller rotating shaft, which includes a cylinder located in the drive chamber. N / 2 sets of driving impellers are evenly distributed around the circumference of the cylinder. Each set of driving impellers includes independent propulsion blades and retraction blades. The propulsion blades and retraction blades are alternately arranged. The propulsion blades are used to uniformly propel the first bearing from a starting position to the right to an ending position during uniform rotation. The retraction blades are used to uniformly propel the first bearing from the ending position to the left to the starting position during uniform rotation.

[0013] The piston section and the plunger hole system match the piston hole on the right end;

[0014] The right end of each piston hole is connected to an oil outlet through an oil outlet channel;

[0015] The right end of each piston hole is connected to an oil inlet through an oil inlet channel; or, the right end of each piston hole is connected to the same oil collecting ring groove through an oil inlet channel, and the oil collecting ring groove is connected to the oil inlet through the main oil inlet channel.

[0016] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: N groups of stroke adjustment mechanisms corresponding one to one with the limit nuts are also installed on the main body; the stroke adjustment mechanism includes a third gear; the third gear is meshed with the spur gear teeth on the outer surface of the limit nut.

[0017] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the stroke adjustment mechanism further includes an adjusting worm, a worm wheel, a first gear and a second gear;

[0018] The adjusting worm is engaged with the worm wheel, and the worm wheel is fixed to the first gear; the first gear is engaged with the second gear, and the second gear is fixed to the third gear.

[0019] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the second gear is located on the left side of the third gear and the outer diameter of the second gear is larger than the outer diameter of the third gear;

[0020] When the first bearing reaches the starting position, the distance between the left end face of the plunger sleeve and the right end face of the second gear is equal to the length of the limit nut;

[0021] When the first bearing reaches the end position, the distance between the right end surface of the plunger sleeve and the right end of the piston hole is equal to the length of the piston section.

[0022] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the stroke adjustment mechanism also includes a damping spring for pushing the worm gear or the first gear.

[0023] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the main body includes a rear cover plate, a sliding guide body, a plunger housing and a front cover plate connected in sequence from left to right; the piston hole is opened on the plunger housing; the oil outlet channel, oil inlet channel, oil inlet and oil outlet are opened on the front cover plate.

[0024] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the anti-rotation section refers to the outer hexagonal section located at the left end of the plunger core rod, and the outer hexagonal section is slidably fitted with the inner hexagonal hole on the rear cover plate.

[0025] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: the plunger hole system includes a sliding through hole opened on the sliding guide body, and the plunger sleeve moves left and right in the sliding through hole;

[0026] A guide groove is also provided on the side of each sliding through hole; a second bearing is installed on the side of the plunger sleeve through a fixed shaft, and the second bearing cooperates with the guide groove.

[0027] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: when the oil inlet channel is connected to the oil collecting ring groove, a one-way valve assembly is respectively provided in each oil inlet channel.

[0028] As a further improvement of the multi-purpose adjustable plunger lubricating oil pump: an oil inlet joint is installed at the oil inlet, an oil outlet joint is installed at the oil outlet, and a one-way valve is provided in both the oil inlet joint and the oil outlet joint.

[0029] Compared with the prior art, the present invention has the following positive effects:

[0030] 1. The present invention uses an impeller rotating shaft to drive multiple plunger core rods to reciprocate simultaneously to achieve multi-channel oil output. Each channel can independently adjust its starting position by rotating the limit nut to change the volume of the oil chamber (it can even be adjusted to zero output as a backup output), so as to achieve the purpose of controlling the amount of oil pumped each time and meet the lubrication needs of multiple channels with different oil volumes.

[0031] Furthermore, the present invention adjusts the limit nut by combining a worm gear structure with a two-stage gear transmission. This structure has the following advantages: (1) the worm gear has a large reduction ratio, which can accurately adjust the position of the limit nut and improve the adjustment accuracy; (2) when adjusting the position, the third gear drives the limit nut to rotate, and when the plunger core rod moves, the limit nut can still move back and forth relative to the third gear without interference, and at this time the third gear cannot rotate due to the self-locking restriction of the worm, and the position of the limit nut will not change.

[0032] 2. In the scheme where each piston hole is connected to an oil inlet, each plunger core rod can pump a different lubricating medium, thereby realizing the function of a single oil pump pumping multiple lubricating media at the same time. Combined with the function of adjusting the oil volume of each channel separately, the device can pump different media at the same time, and the oil volume of each medium can be different, meeting the lubrication requirements of various complex systems.

[0033] 3. The advancing blade and the retracting blade are independent of each other, and there is enough space between them. Therefore, there is no need to consider the tool path transition and interference issues during processing. On the one hand, uniform speed drive can be achieved throughout the entire stroke (the side of each blade in contact with the first bearing is flat when unfolded), making the thrust and suction more stable. On the other hand, seamless connection of the pushing process of the two blades can be achieved, that is, after the plunger sleeve reaches one end at a uniform speed, it is immediately pushed in the opposite direction by the other blade without any rest time. It is always in a working state, which significantly improves the energy conversion efficiency.

[0034] 4. When the first bearing reaches the starting position, the distance between the left end face of the plunger sleeve and the right end face of the second gear is equal to the length of the limit nut. When the first bearing reaches the ending position, the distance between the right end face of the plunger sleeve and the right end of the piston hole is equal to the length of the piston section. In addition, the limit nut and the plunger core rod are threaded and cannot move relative to each other during pumping. This ensures that there is no activity margin when the plunger core rod reaches the starting position and the ending position. The entire stroke (i.e., the amount of oil) is accurately limited by the position of the limit nut relative to the plunger core rod.

[0035] 5. A second bearing is provided between the plunger sleeve and the guide groove, which reduces the friction resistance of reciprocating movement under torque and improves the stability and service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural diagram of the multi-purpose adjustable plunger lubricating oil pump in Example 1;

[0037] Figure 2 for Figure 1 A partial enlarged view of part A;

[0038] Figure 3 for Figure 2 BB partial cross-sectional view;

[0039] Figure 4 for Figure 2 CC partial cross-sectional view;

[0040] Figure 5 for Figure 2 DD partial cross-sectional view;

[0041] Figure 6 This is a partial structural diagram when the plunger core rod is pushed to the right end limit position by the impeller rotating shaft;

[0042] Figure 7 is a three-dimensional diagram of the impeller rotating shaft;

[0043] Figure 8 It is a schematic diagram of the expansion of the propulsion blade and the retraction blade on the impeller rotating shaft;

[0044] Figure 9 The exploded view of the stroke adjustment mechanism and the plunger core rod;

[0045] Figure 10 The exploded view of the sliding guide body, plunger sleeve and plunger core rod;

[0046] Figure 11 This is a structural diagram of the front cover portion in Example 2;

[0047] Figure 12 for Figure 11 A partial enlarged view of part E in the middle.

[0048] Reference numerals include:

[0049] 1. Rear cover; 2. Impeller shaft; 3. Plunger core rod; 4. Sliding guide; 5. Plunger sleeve; 6. Plunger housing; 7. Oil outlet connector; 8. Oil inlet connector; 9. Front cover; 10. Screw plug; 11. Adjusting worm; 12. Worm gear; 13. First gear; 14. Damping spring; 15. Second gear; 16. Third gear; 17. Limit nut; 18. Second bearing; 19. First bearing; 20. Fixed Fixed shaft; 21. Oil collecting ring groove; 22. Annular sealing member; 23. Oil outlet channel; 24. Oil inlet channel; 25. Main oil inlet channel; 26. Valve spring; 27. Top ball; 28. Valve blocking ring; 201. Advance blade; 202. Retract blade; 301. External hexagonal section; 302. Threaded section; 303. Optical axis section; 304. Piston section; 401. Sliding through hole; 402. Guide groove; 403. Drive chamber. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all the embodiments.

[0051] Example 1

[0052] like Figure 1 A multi-purpose adjustable plunger lubricating oil pump includes a body, which includes a rear cover plate 1, a sliding guide body 4, a plunger housing 6 and a front cover plate 9 connected by bolts from left to right.

[0053] The portion formed by the sliding guide body 4 and the plunger housing 6 has a drive cavity 403 and N plunger hole systems evenly distributed around the circumference of the drive cavity 403. Each plunger hole system is fitted with a plunger core rod 3. In this embodiment, there are four sets of plunger hole systems and corresponding plunger core rods 3.

[0054] like Figure 2 and Figure 6 The plunger core rod 3 includes an outer hexagonal section 301, a threaded section 302, an optical axis section 303 and a piston section 304 which are sequentially connected from left to right.

[0055] The outer hexagonal section 301 is slidably matched with the inner hexagonal hole on the rear cover plate 1 to restrict the plunger core rod 3 to move only left and right but not to rotate.

[0056] like Figure 2 and Figure 9 , a limiting nut 17 is installed on the threaded section 302.

[0057] like Figure 2 、 Figure 4 、 Figure 5 and Figure 10, a plunger sleeve 5 is mounted on the outside of the optical axis section 303. The outer diameter of the optical axis section 303 is smaller than that of the piston section 304, and the two constitute a shaft shoulder. The plunger sleeve 5 moves between the limit nut 17 and the shaft shoulder. A first bearing 19 is installed on the plunger sleeve 5, and the axis of the first bearing 19 is perpendicular to the axis of the plunger core rod 3. Furthermore, a second bearing 18 is installed on the side of the plunger sleeve 5 through a fixed shaft 20. The plunger hole system includes a sliding through hole 401 provided on the sliding guide body 4, and a guide groove 402 with a rectangular cross-section is also provided on the side of each sliding through hole 401. The plunger sleeve 5 moves left and right in the sliding through hole 401, and the second bearing 18 cooperates with the guide groove 402.

[0058] like Figure 1 The multi-purpose adjustable plunger lubricating oil pump also includes an impeller shaft 2. This shaft passes through the front cover 9, plunger housing 6, and sliding guide 4, sequentially from right to left. Its left end is connected to the rear cover 1 via a bearing, while its right end is connected to the front cover 9 via a bearing. These connections are equipped with oil seals. The right end of the impeller shaft 2 is mechanically connected to a drive device, such as a motor.

[0059] like Figure 1 、 Figure 7 and Figure 8 The impeller shaft 2 further comprises a cylinder located in the drive cavity 403, on which N / 2 groups (2 groups in this embodiment) of driving impellers are evenly distributed. Each group of driving impellers comprises independent propulsion blades 201 and retraction blades 202. Figure 8 , the propulsion blades 201 and the retraction blades 202 are arranged alternately. The propulsion blades 201 and the retraction blades 202 are independent of each other and are located at different axial positions and circumferential positions. There is enough space between them and they can be processed into any shape without considering the problem of tool path transition and interference. In this embodiment, after the two types of blades are unfolded, the side that contacts the first bearing 19 is flat, so the impeller rotating shaft 2 is rotated according to Figure 1 When rotating at a uniform speed in the middle direction, the propulsion blade 201 can push the first bearing 19 and the plunger sleeve 5 from the starting position to the end position at a uniform speed to the right, and the retraction blade 202 can push the first bearing 19 and the plunger sleeve 5 from the end position to the left at a uniform speed to the starting position. The full-stroke uniform speed drive makes the thrust and suction more stable. At the same time, since the two blades are relatively large and are processed separately, the two blades can be in contact with the first bearing 19 at the starting position and the end position at the same time, realizing a seamless transition. That is, the moment the plunger sleeve 5 reaches one end at a uniform speed, it is immediately pushed in the opposite direction by the other blade without a pause. It is always in a working state, which significantly improves the energy conversion efficiency. It should be noted that the seamless transition here is not only the connection within the same group of driving impellers, but also includes the transition between the blades of any two groups of driving impellers.

[0060] The piston section 304 is matched with the piston hole at the right end of the plunger hole system. The piston hole is opened on the plunger housing 6.

[0061] The front cover 9 is provided with an oil outlet channel 23, an oil inlet channel 24, an oil inlet and an oil outlet. The right end of each piston hole is connected to an oil outlet via an oil outlet channel 23, and the right end of each piston hole is connected to an oil inlet via an oil inlet channel 24. An oil inlet connector 8 is installed at the oil inlet, and an oil outlet connector 7 is installed at the oil outlet. Both the oil inlet connector 8 and the oil outlet connector 7 are provided with a one-way valve. Figure 1 and Figure 6 When the plunger core rod 3 moves to the left, the lubricating medium enters the piston hole through the oil inlet and the oil inlet channel 24. When the plunger core rod 3 moves to the right, the lubricating medium in the piston hole is output from the oil outlet through the oil outlet channel 23, thereby realizing the pumping of the lubricating medium.

[0062] Furthermore, if Figure 2 、 Figure 3 and Figure 9 The main body is also equipped with four sets of stroke adjustment mechanisms corresponding to the limit nuts 17 one by one. The stroke adjustment mechanism includes an adjusting worm 11, a worm wheel 12, a first gear 13, a second gear 15 and a third gear 16.

[0063] The adjusting worm 11 meshes with the worm wheel 12, which is fixed integrally with the first gear 13. The first gear 13 meshes with the second gear 15, which is fixed integrally with the third gear 16. The third gear 16 meshes with the spur gear teeth on the outer surface of the limit nut 17.

[0064] Furthermore, the second gear 15 is located on the left side of the third gear 16 and the outer diameter of the second gear 15 is larger than the outer diameter of the third gear 16. Figure 1 When the first bearing 19 reaches the starting position, the distance between the left end face of the plunger sleeve 5 and the right end face of the second gear 15 is equal to the length of the limit nut 17. Figure 6 When the first bearing 19 reaches the end position, the distance between the right end surface of the plunger sleeve 5 and the right end of the piston hole is equal to the length of the piston section 304.

[0065] Thus, when the plunger sleeve 5 reaches the final position driven by the impeller shaft 2, the plunger core rod 3 will reach the rightmost end of the piston hole, thereby completely discharging the lubricating medium. However, when the plunger sleeve 5 reaches the starting position, the position of the plunger core rod 3 is determined by the position of the limit nut 17. By rotating the limit nut 17, the relative position between it and the plunger core rod 3 can be adjusted, thereby determining the position of the right end of the plunger core rod 3 when the plunger sleeve 5 reaches the starting position, that is, the amount of oil suction.

[0066] The specific adjustment method is as follows: Rotate the impeller shaft 2 to move the currently adjusted plunger sleeve 5 to the left to its starting position, securing the stop nut 17. Then, rotate the adjustment worm 11, driving the worm gear 12 and first gear 13. The first gear 13 then drives the second gear 15 and third gear 16, and finally, the third gear 16 drives the stop nut 17. Since the axial position of the stop nut 17 cannot be changed at this point, the plunger core rod 3 cannot rotate either. Therefore, the stop nut 17 will drive the plunger core rod 3 until its right end reaches the designated position (this position determines the oil suction volume during reciprocating pumping), thereby achieving the purpose of adjusting the oil delivery per pumping cycle. Specifically, if, after adjustment, the right end of the plunger core rod 3 contacts the front cover plate 9, the plunger core rod 3 will not move during operation, regardless of the reciprocating movement of the plunger sleeve 5. This path is in a zero output state.

[0067] Furthermore, a plug 10 and a sealing ring are installed on the outside of the worm, which not only provide a seal but also prevent others from accidentally operating the adjustment worm 11 and locking the adjustment worm 11, thereby changing the stroke of the plunger core rod 3. The stroke adjustment mechanism also includes a damping spring 14 acting on the worm wheel 12 or the first gear 13 to increase the damping of the worm wheel 12 during rotation and improve the adjustment accuracy.

[0068] During operation, first adjust the oil volume of each route, then connect each oil inlet to the corresponding lubricating medium container, then start the motor to drive the impeller shaft 2 to rotate, and each blade will push the plunger sleeve 5 to move back and forth. When the plunger sleeve 5 moves to the right at a constant speed, it will push the plunger core rod 3 to the right through the shaft shoulder to pump out the lubricating medium. When the plunger sleeve 5 reaches the end position, the plunger core rod 3 just reaches the rightmost end, completing the pumping of this round. Then, the plunger sleeve 5 will immediately start to move to the left at a constant speed under the drive of the impeller shaft 2 until it touches the limit nut 17. The limit nut 17 drives the plunger core rod 3 to move to the left together to achieve oil absorption. When the plunger sleeve 5 reaches the starting position, the limit nut 17 just touches the second gear 15. At this time, the plunger core rod 3 completes the oil absorption of this round. Each route reciprocates in this way at the same time to achieve the pumping of different media and different oil volumes.

[0069] Example 2

[0070] like Figure 11 and Figure 12 This embodiment differs from the first embodiment in that the right end of the piston hole is connected to the same oil collecting ring groove 21 via an oil inlet channel 24, and the oil collecting ring groove 21 is connected to the oil inlet via a main oil inlet channel 25. Therefore, this embodiment can only pump a single lubricating medium.

[0071] The oil collecting ring groove 21 is milled, and an annular sealing member 22 is installed at the outer end. Each oil inlet channel 24 is provided with a countersunk hole at the junction with the oil collecting ring groove 21, in which a one-way valve assembly is installed. The one-way valve assembly includes a valve blocking ring 28 installed at the outer end of the countersunk hole, a top ball 27, and a valve spring 26. The valve blocking ring 28 has a through hole, and the valve spring 26 is used to push the top ball 27 outward, sealing the through hole in the valve blocking ring 28. The one-way valve assembly prevents different oil circuits from communicating with each other when pumping lubricating medium, resulting in inaccurate oil quantities.

[0072] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. The scope of the present invention is defined by the claims rather than the foregoing description.

Claims

1. A multi-purpose adjustable plunger lubricating oil pump, comprising a body, the body being provided with an oil inlet and an oil outlet, characterized in that: The body is provided with a driving cavity (403) and N plunger hole systems evenly distributed around the circumference of the driving cavity (403), each of which is provided with a plunger core rod (3); N is an even number; The plunger core rod (3) comprises a threaded section (302), an optical axis section (303), and a piston section (304) connected in sequence from left to right, and also comprises an anti-rotation section for preventing the plunger core rod (3) from rotating; A limit nut (17) is installed on the threaded section (302); A plunger sleeve (5) is sleeved on the outside of the optical axis section (303), the outer diameter of the optical axis section (303) is smaller than that of the piston section (304), and the two form a shaft shoulder; the plunger sleeve (5) moves between the limit nut (17) and the shaft shoulder; a first bearing (19) is installed on the plunger sleeve (5), and the axis of the first bearing (19) is perpendicular to the axis of the plunger core rod (3); The multi-purpose adjustable plunger lubricating oil pump further comprises an impeller rotating shaft (2), the impeller rotating shaft (2) comprising a cylinder located in a driving chamber (403), N / 2 groups of driving impellers being evenly distributed around the circumference of the cylinder, each group of driving impellers comprising mutually independent propulsion blades (201) and retraction blades (202); the propulsion blades (201) and retraction blades (202) being alternately arranged; The propulsion blade (201) is used to push the first bearing (19) from the starting position to the end position at a uniform speed in a uniform direction during uniform rotation, and the retraction blade (202) is used to push the first bearing (19) from the end position to the left at a uniform speed in a uniform direction during uniform rotation; The piston section (304) matches the piston hole at the right end of the plunger hole system; The right end of each piston hole is connected to an oil outlet through an oil outlet channel (23); The right end of each piston hole is connected to an oil inlet via an oil inlet passage (24); or, the right end of each piston hole is connected to the same oil collecting ring groove (21) via an oil inlet passage (24), and the oil collecting ring groove (21) is connected to the oil inlet via a main oil inlet passage (25).

2. The multi-purpose adjustable plunger lubricating oil pump according to claim 1, characterized in that: The main body is also provided with N groups of stroke adjustment mechanisms corresponding one to one with the limit nuts (17); the stroke adjustment mechanisms include a third gear (16); the third gear (16) is meshed with the spur gear teeth on the outer surface of the limit nut (17).

3. The multi-purpose adjustable plunger lubricating oil pump according to claim 2, characterized in that: The stroke adjustment mechanism further includes an adjustment worm (11), a worm wheel (12), a first gear (13) and a second gear (15); The adjusting worm (11) is meshed with the worm wheel (12), and the worm wheel (12) is fixed integrally with the first gear (13); the first gear (13) is meshed with the second gear (15), and the second gear (15) is fixed integrally with the third gear (16).

4. The multi-purpose adjustable plunger lubricating oil pump according to claim 3, characterized in that: The second gear (15) is located on the left side of the third gear (16), and the outer diameter of the second gear (15) is larger than the outer diameter of the third gear (16); When the first bearing (19) reaches the starting position, the distance between the left end face of the plunger sleeve (5) and the right end face of the second gear (15) is equal to the length of the limit nut (17); When the first bearing (19) reaches the end position, the distance between the right end surface of the plunger sleeve (5) and the right end of the piston hole is equal to the length of the piston section (304).

5. The multi-purpose adjustable plunger lubricating oil pump according to claim 3, characterized in that: The stroke adjustment mechanism further includes a damping spring (14) for pushing the worm gear (12) or the first gear (13).

6. The multi-purpose adjustable plunger lubricating oil pump according to claim 1, characterized in that: The main body comprises a rear cover plate (1), a sliding guide body (4), a plunger housing (6) and a front cover plate (9) connected in sequence from left to right; the piston hole is provided on the plunger housing (6); and the oil outlet channel (23), the oil inlet channel (24), the oil inlet and the oil outlet are provided on the front cover plate (9).

7. The multi-purpose adjustable plunger lubricating oil pump according to claim 6, characterized in that: The anti-rotation section refers to an outer hexagonal section (301) located at the left end of the plunger core rod (3), and the outer hexagonal section (301) is in sliding engagement with the inner hexagonal hole on the rear cover plate (1).

8. The multi-purpose adjustable plunger lubricating oil pump according to claim 6, characterized in that: The plunger hole system comprises a sliding through hole (401) provided on the sliding guide body (4), and the plunger sleeve (5) moves left and right in the sliding through hole (401); A guide groove (402) is also provided on the side of each sliding through hole (401); a second bearing (18) is installed on the side of the plunger sleeve (5) via a fixed shaft (20), and the second bearing (18) is matched with the guide groove (402).

9. The multi-purpose adjustable plunger lubricating oil pump according to claim 1, characterized in that: When the oil inlet passages (24) are connected to the oil collecting ring groove (21), a one-way valve assembly is provided in each oil inlet passage (24).

10. The multi-purpose adjustable plunger lubricating oil pump according to claim 1, characterized in that: An oil inlet joint (8) is installed at the oil inlet, and an oil outlet joint (7) is installed at the oil outlet. Both the oil inlet joint (8) and the oil outlet joint (7) are provided with a one-way valve.

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