Automatic oil injector for high-pressure breaking hammer

Abstract

The invention relates to an automatic oil injector for a high-pressure breaking hammer. The automatic oiling device structurally comprises a grease tank which is arranged on a main valve body of the automatic oiling device, and the automatic oiling device mainly structurally comprises that a grease oiling liquid control valve is connected with a hydraulic oil pressure relief control valve through a third hydraulic oil channel. The grease injection liquid control valve comprises a grease storage sleeve, a grease outlet sleeve, a one-way ball valve, a one-way valve spring, an upper pressure spring, an inner piston, an outer piston and the like. The hydraulic oil pressure relief control valve structure comprises a lower valve sleeve, a lower pressure spring, a pressure relief valve element and a pressure adjusting ejector rod. And the pressure release valve core is a two-position two-way valve core shaft with a limit. Compared with the prior art, the automatic oil injector for the high-pressure breaking hammer has the advantages that time and labor are saved during operation, automatic suction and extrusion of oil are realized, pressure can be released instantly to quickly realize re-lubrication, oil injection is uniform, stable and reliable, maintenance work and cost are low, and economic benefits are good.

Description

Technical Field

[0001] The present invention relates to an automatic grease filling device, especially a high-pressure breaker automatic oiler used in conjunction with a full-hydraulic excavator. Background Art

[0002] At present, high-pressure breakers are commonly used attachments for full-hydraulic excavator construction. High-pressure breakers are used frequently. To ensure the normal life of the breaker, lubricating grease must be intermittently injected between the bushing and the drill rod for lubrication. Most of the existing lubrication methods are manual oil injection through a manual grease gun or a simple oiler device. Due to the poor construction site environment, especially in cold or hot seasons, the surrounding environment can reach -30°C to +50°C. Such devices have the following defects: long oil injection interval time, uneven oil injection interval time and oil injection volume, and high labor intensity; in addition, a small number of imported high-end breakers use a hydraulic drive method for oil injection, that is, the medium-pressure oil in the oil cavity of the device drives the outer piston and the inner piston to inject grease. In order to quickly drain the oil, the breaker needs to be designed and manufactured with a special oil passage structure inside the breaker body. Such devices have the following defects: not only does the special oil passage structure inside increase the cost of the breaker, but also such an oil filling device has a narrow application range and is not applicable to domestic high-pressure breakers, resulting in a very low market share. Summary of the Invention

[0003] The technical task of the present invention is to provide a high-pressure breaker automatic oiler that can automatically inject oil and instantaneously relieve pressure in view of the deficiencies of the above situation.

[0004] The technical solution adopted by the present invention to solve its technical problems is: The high-pressure breaker automatic oiler of the present invention includes a grease tank and an automatic oil injection device. The grease tank is arranged on the main valve body of the automatic oil injection device and is sealed with the main valve body through an O-ring. The grease inlet is arranged at the lower part of the grease tank; The structure of the automatic oil injection device mainly includes: The grease injection hydraulic control valve is connected to the hydraulic oil pressure relief control valve through the third hydraulic oil passage; The thread of the upper valve seat at one end of the grease injection hydraulic control valve is fixedly connected to the main valve body, and an adjusting nut is arranged on the thread of the upper valve seat. The upper valve sleeve of the grease injection hydraulic control valve is installed in the main valve body, and a positioning pin shaft is arranged between the upper valve sleeve and the main valve body to connect the upper valve sleeve and the main valve body. One end of the inner cavity of the upper valve sleeve is installed with an oil storage sleeve, and the inner cavity of the oil storage sleeve and the inner cavity of the upper valve sleeve form a grease sealing cavity. An oil outlet sleeve is installed in the oil storage sleeve, and an O-ring is installed on the oil storage sleeve. One end of the oil outlet sleeve is fixed in the upper valve seat. A one-way ball valve and a one-way valve spring are installed in the oil outlet sleeve, and the one-way valve spring presses against the one-way ball valve.

[0005] The grease inlet is communicated with the grease sealing cavity inlet; One end of the upper pressure spring is sleeved on the upper valve sleeve, and the other end is fixed on the cross-slot spring seat. The cross-slot spring seat is connected to the inner piston by a thread. The inner piston is installed inside the outer piston. The inner piston and the outer piston communicate with the grease sealing cavity.

[0006] The external thread of the internal hexagonal plug connects to the main valve body.

[0007] The inner cavity of the upper valve sleeve is provided with an outer piston.

[0008] The grease outlet is arranged on the main valve body and communicates with the grease oil cavity; the grease oil cavity communicates with the grease passage, and the grease passage is arranged on the oil outlet sleeve; the third hydraulic oil passage connects to the third hydraulic oil cavity.

[0009] The structure of the hydraulic oil pressure relief control valve includes: the lower valve sleeve of the hydraulic oil pressure relief control valve is installed in the main valve body and fixedly connected to the main valve body by a thread. A lower pressure spring is installed inside the lower valve sleeve, and a spring seat is arranged at each end of the lower pressure spring. A pressure relief valve spool is installed at one end of the lower valve sleeve. One end of the pressure relief valve spool contacts with the spring seat, and a lower valve seat is installed at the other end of the lower valve sleeve and connected by a thread. A pressure regulating push rod is installed inside the lower valve seat and connected by a thread. One end of the pressure regulating push rod contacts with the spring seat. A locking nut is installed at the other end of the pressure regulating push rod.

[0010] The high-pressure hydraulic oil inlet is arranged on the main valve body and communicates with the first hydraulic oil cavity; the first hydraulic oil passage and the second hydraulic oil passage are small holes on the lower valve sleeve; the hydraulic oil drain outlet is arranged on the main valve body and communicates with the second hydraulic oil cavity.

[0011] The shape of the inner piston is a stepped shaft structure.

[0012] The shape of the outer piston is a stepped structure.

[0013] The pressure relief valve spool is a two-position two-way spool shaft with a limit.

[0014] The lower valve sleeve is a two-position three-way structure with pressure regulation.

[0015] The automatic greaser for high-pressure breaker hammers of the present invention has the following characteristics compared with the prior art: 1. By setting the grease injection hydraulic control valve, the functions of automatically opening and closing the grease sealing cavity and automatically sucking and extruding the grease are realized.

[0016] 2. By setting the hydraulic oil pressure relief control valve, the problem of slow pressure drop of the automatic greaser for high-pressure breaker hammers caused by the high pressure and large size of domestic breaker hammers is solved. The oil pressure of the present invention can be quickly reduced during an extremely short working interval, and then grease can be sucked in. When the breaker hammer works again, re-lubrication can be achieved, overcoming the drawback that the original domestic breaker hammers could not be lubricated due to insufficient oil pressure reduction during a short working interval.

[0017] III. By providing a pressure regulating ejector rod on the hydraulic oil pressure relief control valve, the pressing force of the lower pressure spring can be adjusted by adjusting the threaded length of the pressure regulating ejector rod screwed in, thereby adjusting the pressure value of the oil discharge.

[0018] IV. By providing a pressure relief valve spool that can move, the oil inlet and return passages of the lower valve sleeve can be opened or closed, achieving the purpose of uniform oil injection and good lubrication effect, and solving the problems of uneven oil injection time and long oil injection interval time compared with manual oil injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings.

[0020] Figure 1 is a three-dimensional structural schematic diagram of an automatic oil injector for a high-pressure breaker; Figure 2 is a front sectional structural schematic diagram of the automatic oil injection device of the automatic oil injector for the high-pressure breaker; Figure 3 is a top view structural schematic diagram of the automatic oil injection device of the automatic oil injector for the high-pressure breaker; Figure 4 is a left view structural schematic diagram of the automatic oil injection device of the automatic oil injector for the high-pressure breaker; Figure 5 is a front sectional structural schematic diagram of the hydraulic oil pressure relief control valve of the automatic oil injector for the high-pressure breaker; Figure 6 is a top view structural schematic diagram of the hydraulic oil pressure relief control valve of the automatic oil injector for the high-pressure breaker; Figure 7 is a left view structural schematic diagram of the hydraulic oil pressure relief control valve of the automatic oil injector for the high-pressure breaker; Figure 8 is a three-dimensional structural schematic diagram of the hydraulic oil pressure relief control valve of the automatic oil injector for the high-pressure breaker; Figure 9 is a front sectional structural schematic diagram of the grease injection hydraulic control valve of the automatic oil injector for the high-pressure breaker; Figure 10 is a top view structural schematic diagram of the grease injection hydraulic control valve of the automatic oil injector for the high-pressure breaker; Figure 11 is a left view structural schematic diagram of the grease injection hydraulic control valve of the automatic oil injector for the high-pressure breaker; Figure 12 is a three-dimensional structural schematic diagram of the grease injection hydraulic control valve of the automatic oil injector for the high-pressure breaker; Figure 13 is a structural schematic diagram of the grease injection state I of the automatic oil injector for the high-pressure breaker; Figure 14A partial enlarged view of the first hydraulic oil channel and the second hydraulic oil channel of the automatic oiler for a high-pressure breaker in State 1; Figure 15 A schematic structural diagram of the grease injection state 2 of the automatic oiler for a high-pressure breaker; Figure 16 A partial enlarged view of the first hydraulic oil channel and the second hydraulic oil channel of the automatic oiler for a high-pressure breaker in State 2; Figure 17 A schematic structural diagram of the automatic oiler for a high-pressure breaker in the state of automatically sucking grease; Figure 18 A partial enlarged view of the first hydraulic oil channel and the second hydraulic oil channel of the automatic oiler for a high-pressure breaker in the state of automatically sucking grease; Figure 19 A schematic structural diagram of the connection between the automatic oiler for a high-pressure breaker and the breaker; In the figure: 1. Grease tank, 2. Automatic oiling device, 3. Main valve body, 4. Grease injection hydraulic control valve, 5. Hydraulic oil pressure relief control valve, 6. Hexagon socket head cap screw plug, 7. Positioning pin shaft, 8. Pressure adjusting push rod, 9. Locking nut, 10. Lower valve seat, 11. Lower valve sleeve, 12. Spring seat, 13. Lower pressure spring, 14. Pressure relief valve spool, 15. Working pedal, 16. Cross recessed spring seat, 17. Upper pressure spring, 18. Inner piston, 19. Outer piston, 20. Upper valve sleeve, 21. Breaker, 22. Check valve ball, 23. Oil storage sleeve, 24. Oil outlet sleeve, 25. Adjusting nut, 26. Upper valve seat, 27. Check valve spring, 28. Hydraulic oil drain port, 29. High-pressure hydraulic oil inlet port, 30. First hydraulic oil channel, 31. Second hydraulic oil channel, 32. First hydraulic oil chamber, 33. Second hydraulic oil chamber, 34. Third hydraulic oil channel, 35. Third hydraulic oil chamber, 36. Grease outlet, 37. Grease chamber, 38. Grease channel, 39. Grease inlet, 40. Grease sealing chamber, 41. Fuel tank. Detailed implementation mode

[0021] The automatic oiler for a high-pressure breaker will be described in detail below with reference to the accompanying drawings of the specification.

[0022] The automatic oiler for a high-pressure breaker of the present invention has a structure including a grease tank 1 and an automatic oiling device 2. The grease tank 1 is arranged on the main valve body 3 of the automatic oiling device 2 and is sealed with the main valve body 3 through an O-ring. The grease inlet 39 is arranged at the lower part of the grease tank 1. During operation, the lubricating grease in the grease tank 1 enters the automatic oiling device 2 through the grease inlet 39. After the grease is used up, the grease tank 1 can be replaced at any time.

[0023] The structure of the automatic oil injection device 2 mainly includes: the grease injection hydraulic control valve 4 is connected to the hydraulic oil pressure relief control valve 5 through the third hydraulic oil passage 34.

[0024] The external thread of the upper valve seat 26 at one end of the grease injection hydraulic control valve 4 is fixedly connected to the main valve body 3, and the adjusting nut 25 is arranged on the external thread of the upper valve seat 26. By operating the adjusting nut 25, the threaded length of the upper valve seat 26 screwed in can be changed. The upper valve sleeve 20 of the grease injection hydraulic control valve 4 is installed in the main valve body 3, and the positioning pin shaft 7 is arranged between the upper valve sleeve 20 and the main valve body 3 to connect the upper valve sleeve 20 and the main valve body 3. One end of the inner cavity of the upper valve sleeve 20 is installed with an oil storage sleeve 23, and an oil storage cavity 40 is formed between the inner cavity of the oil storage sleeve 23 and the inner cavity of the upper valve sleeve 20. An oil outlet sleeve 24 is installed in the oil storage sleeve 23, and an O-ring seal is installed on the oil storage sleeve 23 to ensure the seal between the oil storage sleeve 23 and the oil outlet sleeve 24. One end of the oil outlet sleeve 24 is fixed in the upper valve seat 26, and the oil outlet sleeve 24 can move left and right along with the upper valve seat 26, so as to adjust the volume of the grease storage cavity 40, and thus adjust the amount of oil injection each time. A one-way ball valve 22 and a one-way valve spring 27 are installed in the oil outlet sleeve 24, and the one-way valve spring 27 presses against the one-way ball valve 22 to ensure the one-way flow of grease and prevent backflow. The oil outlet sleeve 24 is fixed in the upper valve seat 26 through a hole and a wire retaining ring.

[0025] During operation, the volume of the grease storage cavity 40 can be adjusted by adjusting the stroke of the thread of the upper valve seat 26, so as to adjust the amount of oil injection each time, and the grease injection hydraulic control valve 4 is locked by the adjusting nut 25. The positioning pin shaft 7 can ensure the correct installation position of the grease injection hydraulic control valve 4 and the main valve body 3, so that the grease inlet 39 is communicated with the inlet of the grease storage cavity 40.

[0026] One end of the upper pressure spring 17 is sleeved on the upper valve sleeve 20, and the other end is fixed on the cross-slot spring seat 16. The cross-slot spring seat 16 is connected to the inner piston 18 by a thread. The cross-slot on the cross-slot spring seat 16 ensures that the cross-slot spring seat 16 can also enter the high-pressure hydraulic oil at the end to generate a thrust. The inner piston 18 is installed inside the outer piston 19. The inner piston 18 and the outer piston 19 are communicated with the grease storage cavity 40.

[0027] The external thread of the hexagon socket head cap screw 6 is connected to the main valve body 3, and the hexagon socket head cap screw 6 can block the cross-slot spring seat 16.

[0028] The outer piston 19 is arranged in the inner cavity of the upper valve sleeve 20, and the outer piston 19 can slide in the upper valve sleeve 20. The inner piston 18 is installed in the outer piston 19. The outer piston 19 and the inner piston 18 are sealed by a groove and an O-ring seal.

[0029] An O-ring seal is installed on the upper valve sleeve 20 to ensure the seal between the upper valve sleeve 20 and the main valve body 3, the oil storage sleeve 23, and the outer piston 19.

[0030] The oil outlet 36 of the grease is arranged on the main valve body 3 and is communicated with the grease oil cavity 37; the grease oil cavity 37 is communicated with the grease passage 38. The grease passage 38 is arranged on the oil outlet sleeve 24 and is communicated with the grease oil cavity 37 through the small holes arranged on the oil outlet sleeve 24; the third hydraulic oil passage 34 is connected to the third hydraulic oil cavity 35.

[0031] The structure of the hydraulic oil pressure relief control valve 5 includes: the lower valve sleeve 11 of the hydraulic oil pressure relief control valve 5 is installed in the main valve body 3 and is fixedly connected to the main valve body 3 by threads. An O-ring seal is installed on the lower valve sleeve 11 to ensure the seal between the lower valve sleeve 11 and the main valve body 3. A lower pressure spring 13 is installed inside the lower valve sleeve 11, and a spring seat 12 is arranged at each end of the lower pressure spring 13. A pressure relief valve spool 14 is installed at one end of the lower valve sleeve 11, and one end of the pressure relief valve spool 14 is in contact with the spring seat 12; a lower valve seat 10 is installed at the other end of the lower valve sleeve 11 and is connected by threads. A pressure regulating ejector rod 8 is installed inside the lower valve seat 10 and is connected by threads. One end of the pressure regulating ejector rod 8 is in contact with the spring seat 12. By adjusting the threaded stroke of the pressure regulating ejector rod 8 screwed in, the pressing force of the lower pressure spring 13 can be adjusted, and thus the pressure of the oil discharge can be adjusted. A lock nut 9 is installed at the other end of the pressure regulating ejector rod 8, and the lock nut 9 locks the pressure regulating ejector rod 8 on the lower valve seat 10.

[0032] The high-pressure hydraulic oil inlet 29 is arranged on the main valve body 3 and is communicated with the first hydraulic oil cavity 32; the first hydraulic oil passage 30 and the second hydraulic oil passage 31 are small holes on the lower valve sleeve 11; the hydraulic oil discharge port 28 is arranged on the main valve body 3 and is communicated with the second hydraulic oil cavity 33.

[0033] The inner piston 18 is in the shape of a stepped shaft structure.

[0034] The outer piston 19 is in the shape of a stepped structure.

[0035] The pressure relief valve spool 14 is a two-position two-way spool shaft with a limit.

[0036] The lower valve sleeve 11 is a two-position three-way structure with pressure regulation.

[0037] When the present invention is in use, the oil injection steps are divided into three steps: Oil injection state one: During operation, step on the breaker working pedal 15. The breaker 21 starts to work. The high-pressure hydraulic oil of the breaker enters the high-pressure hydraulic oil inlet 29, then enters the first hydraulic oil chamber 32, overcomes the pressure of the downward pressure spring 13, and pushes the pressure relief valve spool 14 to move leftward. The pressure relief valve spool 14 closes the second hydraulic oil passage 31 and opens the first hydraulic oil passage 30. At this time, the first hydraulic oil passage 30 is communicated with the third hydraulic oil passage 34, and the high-pressure hydraulic oil enters the third hydraulic oil chamber 35. When the high-pressure hydraulic oil enters the third hydraulic oil chamber 35, it overcomes the pressure of the upward pressure spring 17, and the outer piston 19 drives the inner piston 18 to move rightward simultaneously, pushing the grease in the grease sealing chamber 40 to move towards the grease outlet 36. At the same time, the outer piston 19 seals the grease inlet 39.

[0038] Lubrication state two: After the outer piston 19 seals the grease inlet 39, the inner piston 18 continues to move rapidly towards the grease sealing chamber 40, pushing the grease in the grease sealing chamber 40 through the one-way ball valve 22, the grease passage 38, and the grease chamber 37. The grease is discharged from the outlet 36, enters the breaker lubrication points through the lubricating oil pipeline, and conducts lubrication. The breaker 21 continues to work. The equipment of the present invention maintains pressure.

[0039] Lubrication state three, i.e., the automatic grease suction state: Release the breaker working pedal 15, and the breaker 21 stops working and enters the working interval. The oil pressure in the pipeline of the breaker 21 gradually decreases. When the pressure received by the downward pressure spring 13 is greater than the set oil pressure (the set oil pressure is generally 150 - 250 Kg), the downward pressure spring 13 pushes the spring seat 12 to move rightward, and the pressure relief valve spool 14 moves rightward together under the push of the spring seat 12. The pressure relief valve spool 14 closes the first hydraulic oil passage 30 and opens the second hydraulic oil passage 31. At this time, the second hydraulic oil passage 31 is communicated with the third hydraulic oil passage 34, and the high-pressure hydraulic oil existing in the third hydraulic oil chamber 35 instantaneously passes through the third hydraulic oil passage 34 and the second hydraulic oil passage 31 and enters the hydraulic oil chamber 33, and returns oil from the hydraulic oil drain port 28 to the breaker 21 oil return pipeline and the fuel tank 41, and the pressure instantaneously drops to the oil return back pressure value.

[0040] When the pressure of the high-pressure hydraulic oil in the third hydraulic oil chamber 35 drops to the oil return back pressure value, under the action of the spring pressure 17, the inner piston 18 drives the outer piston 19 to move rapidly leftward, opening the grease inlet 39. The volume of the grease sealing chamber 40 rapidly changes from small to large, forming a local vacuum. Under the action of the atmospheric pressure, the grease in the grease tank 1 is sucked into the grease sealing chamber 40. Thus, a working cycle is completed.

[0041] When stepping on the working pedal 15 again and the oil pressure of the high-pressure hydraulic oil of the breaker 21 rises again, the present invention starts the lubrication work again.

[0042] The present invention adopts a double-valve structure: a grease injection hydraulic control valve 4 and a hydraulic oil pressure relief control valve 5. It solves the sealing problem of the grease sealing cavity 40 and realizes the functions of automatic opening and closing of the grease sealing cavity 40, as well as automatic suction and extrusion of grease. The structure is simple and the operation is reliable. The high-pressure hydraulic oil of the breaker can be accurately controlled through the hydraulic oil pressure relief control valve 5, achieving the function of instantaneous pressure relief.

[0043] The hydraulic oil pressure relief control valve 5 can maintain the working pressure when the breaker 21 is working after the injection in the present invention; it can also quickly relieve pressure during the working interval of the breaker 21, so as to realize the rapid automatic grease injection when the breaker 21 works again. The rapid pressure relief does not require the manufacture of a dedicated pressure relief oil passage inside the breaker, saving the manufacturing cost of the dedicated pressure relief oil passage inside the breaker in the prior art.

[0044] The oil injection amount of the present invention is adjustable, and the oil injection amount per time can be adjusted according to different working conditions and breaker models. It can be applied to different working environments and different specifications of breakers.

[0045] The oil discharge pressure of the present invention is adjustable, and the oil discharge pressure can be adjusted according to the requirements of the working environment and the hardness of the material to achieve the effect of high-quality lubrication. The present invention has the characteristics of automatic oil injection, uniform oil injection, stability and reliability. It ensures that the grease can be accurately injected according to the set dosage in each working cycle. That is, it eliminates the manual oil injection by the operator, reduces the labor cost, and significantly improves the service life of the bushing, drill rod and piston, making the component replacement cycle longer, reducing the maintenance work and cost, and significantly improving the economic benefits.

Claims

1. Automatic oil injector for high-pressure breaker, the structure includes a grease tank (1) and an automatic oil injection device (2), characterized in that: The grease tank (1) is arranged on the main valve body (3) of the automatic lubricating device (2) and is sealed with the main valve body (3) through an O-ring. The grease inlet (39) is arranged at the lower part of the grease tank (1). The structure of the automatic lubricating device (2) mainly includes: the grease injection hydraulic control valve (4) is connected to the hydraulic oil pressure relief control valve (5) through the third hydraulic oil channel (34). The thread of the upper valve seat (26) at one end of the grease injection hydraulic control valve (4) is fixedly connected to the main valve body (3), and the adjusting nut (25) is arranged on the thread of the upper valve seat (26). The upper valve sleeve (20) of the grease injection hydraulic control valve (4) is installed in the main valve body (3). The positioning pin shaft (7) is arranged between the upper valve sleeve (20) and the main valve body (3) to connect the upper valve sleeve (20) and the main valve body (3). One end of the inner cavity of the upper valve sleeve (20) is installed with an oil storage sleeve (23), and the inner cavity of the oil storage sleeve (23) and the inner cavity of the upper valve sleeve (20) form a grease sealing cavity (40). An oil outlet sleeve (24) is installed in the oil storage sleeve (23), and an O-ring is installed on the oil storage sleeve (23). One end of the oil outlet sleeve (24) is fixed in the upper valve seat (26). A one-way ball valve (22) and a one-way valve spring (27) are installed in the oil outlet sleeve (24), and the one-way valve spring (27) presses against the one-way ball valve (22). The grease inlet (39) is communicated with the inlet of the grease sealing cavity (40). One end of the upper pressure spring (17) is sleeved on the upper valve sleeve (20), and the other end is fixed on the cross-slot spring seat (16). The cross-slot spring seat (16) is connected to the inner piston (18) by thread. The inner piston (18) is installed inside the outer piston (19). The inner piston (18) and the outer piston (19) are communicated with the grease sealing cavity (40). The external thread of the internal hexagonal plug (6) is connected to the main valve body (3). The outer piston (19) is arranged in the inner cavity of the upper valve sleeve (20). The grease outlet (36) is arranged on the main valve body (3) and is communicated with the grease oil cavity (37). The grease oil cavity (37) is communicated with the grease channel (38), and the grease channel (38) is arranged on the oil outlet sleeve (24). The third hydraulic oil channel (34) is connected to the third hydraulic oil cavity (35).

2. The automatic oil injector for high-pressure breaker according to claim 1, characterized in that: The structure of the hydraulic oil pressure relief control valve (5) includes: the lower valve sleeve (11) of the hydraulic oil pressure relief control valve (5) is installed in the main valve body (3) and is fixedly connected to the main valve body (3) by thread. A lower pressure spring (13) is installed in the lower valve sleeve (11), and a spring seat (12) is arranged at each end of the lower pressure spring (13). A pressure relief valve spool (14) is installed at one end of the lower valve sleeve (11), and one end of the pressure relief valve spool (14) is in contact with the spring seat (12). A lower valve seat (10) is installed at the other end of the lower valve sleeve (11) and is connected by thread. A pressure regulating ejector rod (8) is installed in the lower valve seat (10) and is connected by thread. One end of the pressure regulating ejector rod (8) is in contact with the spring seat (12). A locking nut (9) is installed at the other end of the pressure regulating ejector rod (8). The high-pressure hydraulic oil inlet (29) is provided on the main valve body (3) and is communicated with the first hydraulic oil chamber (32); the first hydraulic oil passage (30) and the second hydraulic oil passage (31) are small holes on the lower valve sleeve (11); the hydraulic oil drain port (28) is provided on the main valve body (3) and is communicated with the second hydraulic oil chamber (33).

3. The automatic oil injector for high-pressure breaker according to claim 1, characterized in that: The inner piston (18) is in the shape of a stepped shaft structure.

4. The automatic oil injector for high-pressure breaker according to claim 1, characterized in that: The outer piston (19) is in the shape of a stepped structure.

5. The automatic oil injector for the high-pressure breaker according to claim 2, characterized in that: The pressure relief valve spool (14) is a two-position two-way spool shaft with a limit.

6. The automatic oil injector for high-pressure breaker according to claim 2, wherein: The lower valve sleeve (11) is a two-position three-way structure with pressure regulation.

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