External confluence logic valve, excavator hydraulic system and excavator

Abstract

The utility model belongs to the technical field of engineering machinery and provides an external confluence logic valve, an excavator hydraulic system and an excavator, the external confluence logic valve comprises a cartridge valve, a pressure oil inlet, a reversing valve and a pressure oil outlet, the cartridge valve is provided with a working cavity, a spring control cavity and a valve core driving cavity, the pressure oil inlet is communicated with the valve core driving cavity, and the reversing valve is communicated with the working cavity. The reversing valve comprises a first working side and a second working side, the first working side is hydraulically connected to the pressure oil inlet, the second working side is hydraulically connected to the spring control cavity, the reversing valve is used for guiding hydraulic oil of the pressure oil inlet to the spring control cavity or used for pressure relief of the spring control cavity, and the pressure oil outlet is communicated with the working cavity. The reversing valve can directly guide hydraulic oil of the pressure oil inlet to the spring control cavity, so that the valve element of the cartridge valve is rapidly closed, and the response speed of closing of the cartridge valve is greatly increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to an external converging logic valve, an excavator hydraulic system and an excavator. Background Art

[0002] Patent CN116716944A discloses an excavator hydraulic system, which realizes the functions of separate oil supply and combined oil supply to the breaker hammer by arranging an external crushing valve (external converging logic valve) outside the main valve and controlling the breaker hammer valve plate of the main valve and the external crushing valve by arranging a pilot valve group, thereby realizing the functions of separate oil supply and converging oil supply to the breaker hammer by the P1 oil circuit and the P2 oil circuit respectively.

[0003] The specific hydraulic structure of this type of external crushing valve is as follows Figure 1 As shown in the figure. When the pressure at port XAo1 is low, the spool of control valve B is in the right position, and the pressure oil at port P3 enters the spring chamber of cartridge valve A through the orifice of the spool of cartridge valve A. At this time, the pressure in the spring chamber of cartridge valve A equals the pressure at port P3. The area of ​​cartridge valve spring chamber × the pressure at port P3 + the spring force > the pressure at port P3 × the area of ​​port P3. The cartridge valve is shut off, and the pressure oil at port P3 cannot flow into port Ao.

[0004] When there is pressurized oil at port XAo1, the spool of control valve B is in the left position, and the pressurized oil in the spring chamber of the cartridge valve will enter the working chamber of the cartridge valve for pressure relief. Affected by the throttle hole, the pressure in the spring chamber of the cartridge valve will be lower than the pressure at port P3, and the spool of the cartridge valve will move left, and the working chamber of the cartridge valve will be connected to port Ao.

[0005] When XAo1 changes from high pressure to low pressure, the spring chamber of the cartridge valve is pressurized, and the pressure in the spring chamber of the cartridge valve gradually increases until it reaches P3. As the pressure in the spring chamber of the cartridge valve gradually increases, the valve core will gradually move to the right. Due to the existence of the throttle hole, there is a certain time difference for the pressure in the spring chamber of the cartridge valve to rise to the pressure of the P3 port. During this time difference, the valve core of the cartridge valve is not completely closed, resulting in a delay in the closing of the external crushing valve. Utility Model Content

[0006] In response to the above-mentioned defects or shortcomings, the utility model provides an external converging logic valve, an excavator hydraulic system and an excavator, aiming to solve the technical problems of delay in closing the valve core of the existing external crushing valve and low closing sensitivity of the external crushing valve.

[0007] To achieve the above-mentioned purpose, the utility model provides an external converging logic valve, including a cartridge valve, a pressure oil inlet, a reversing valve and a pressure oil outlet. The cartridge valve is provided with a working chamber, a spring control chamber and a valve core drive chamber. The pressure oil inlet is connected to the valve core drive chamber. The reversing valve includes a first working side and a second working side. The first working side is hydraulically connected to the pressure oil inlet, and the second working side is hydraulically connected to the spring control chamber. The reversing valve is used to guide the hydraulic oil in the pressure oil inlet to the spring control chamber or to relieve pressure in the spring control chamber. The pressure oil outlet is connected to the working chamber.

[0008] In an embodiment of the present utility model, a first oil port and a second oil port are provided on the first working side, and a third oil port is provided on the second working side. The first oil port is connected to the pressure oil inlet, the second oil port is connected to the working chamber, and the third oil port is connected to the spring control chamber. The reversing valve is used to select one of the first oil port and the second oil port to be connected to the third oil port.

[0009] In an embodiment of the present utility model, the reversing valve is a two-position three-way valve and includes a first valve position and a second valve position. The first valve position is configured so that the first oil port and the third oil port are connected and the second oil port is blocked. The second valve position is configured so that the second oil port and the third oil port are connected and the first oil port is blocked.

[0010] In an embodiment of the present utility model, the reversing valve is a pilot reversing valve and includes a pilot reversing end arranged near the second valve position and a spring return end arranged near the first valve position. The spring return end is provided with a return spring for controlling the reversing valve to remain in the first valve position when the pilot reversing end is low-pressure oil.

[0011] To achieve the above-mentioned objectives, the utility model also provides an excavator hydraulic system, which includes a system main valve, an external converging logic valve, a breaker hammer unit and a control unit. The system main valve includes a first multi-way valve provided with a first oil inlet and a second multi-way valve provided with a second oil inlet. The first multi-way valve includes a breaker hammer valve plate, and the second multi-way valve is provided with an internal bypass oil circuit leading from the second oil inlet. The external converging logic valve is the external converging logic valve described above, and the pressure oil inlet of the external converging logic valve is connected to the internal bypass oil circuit. The oil inlet end of the breaker hammer unit is respectively connected to the breaker hammer working oil port of the breaker hammer valve plate and the pressure oil outlet of the external converging logic valve. The control unit is used to control the breaker hammer valve plate and the reversing valve to perform reversing respectively.

[0012] In an embodiment of the present utility model, the breaker hammer valve plate includes a shut-off valve position for controlling the cut-off between the first oil inlet and the breaker hammer working oil port and a breaker hammer working valve position for controlling the conduction between the first oil inlet and the breaker hammer working oil port. The control unit is used to control the breaker hammer valve plate to switch between the shut-off valve position and the breaker hammer working valve position.

[0013] In an embodiment of the present utility model, the control unit includes a first pilot control valve, one side of the first pilot control valve is connected to the pilot oil inlet circuit and the pilot oil return circuit, and the other side is connected to the reversing end of the breaker hammer valve plate close to the breaker hammer working valve position. The first pilot control valve is used to guide the hydraulic oil in the pilot oil inlet circuit to the reversing end of the breaker hammer valve plate or to provide pressure relief and oil return to the reversing end of the breaker hammer valve plate.

[0014] In an embodiment of the present utility model, the control unit includes a second pilot control valve, one side of the second pilot control valve is connected to the pilot oil inlet circuit and the pilot oil return circuit, and the other side is connected to the pilot reversing end of the reversing valve. The second pilot control valve is used to guide the hydraulic oil of the pilot oil inlet circuit to the pilot reversing end of the reversing valve or to relieve pressure and return oil to the pilot reversing end of the reversing valve.

[0015] In an embodiment of the present invention, an inlet merging pipeline is provided at the oil inlet end of the breaker hammer unit, a one-way valve is provided between the pressure oil outlet and the inlet merging pipeline, and the breaker hammer working oil port of the breaker hammer valve plate is connected to the inlet merging pipeline.

[0016] To achieve the above objectives, the present invention further provides an excavator, wherein the excavator includes the excavator hydraulic system described above.

[0017] Through the above technical solution, the external converging logic valve provided by the embodiment of the utility model has the following beneficial effects:

[0018] The external converging logic valve in the utility model connects the first working side of the reversing valve to the pressure oil inlet and the second working side to the spring control chamber. By controlling the reversing of the reversing valve, the opening and closing control of the cartridge valve can be realized. When the cartridge valve is closed, the reversing valve can directly guide the hydraulic oil at the pressure oil inlet to the spring control chamber, thereby realizing rapid closure of the valve core of the cartridge valve and greatly increasing the response speed of the cartridge valve closing.

[0019] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a hydraulic principle diagram of an external converging logic valve in the prior art;

[0022] Figure 2 This is a hydraulic principle diagram of an external converging logic valve according to an embodiment of the present utility model;

[0023] Figure 3It is a hydraulic principle diagram of the hydraulic system of an excavator according to an embodiment of the utility model;

[0024] Figure 4 This is a hydraulic flow diagram when the first oil pump of the hydraulic system of the excavator in the embodiment of the present utility model supplies oil to the crushing valve unit;

[0025] Figure 5 This is a hydraulic flow diagram when the second oil pump of the hydraulic system of the excavator in the embodiment of the present utility model supplies oil to the crushing valve unit.

[0026] Description of Reference Numerals

[0027] 1. External converging logic valve; 11. Cartridge valve; 11a. Working chamber; 11b. Spring control chamber; 11c. Valve core drive chamber; 12. Reversing valve; 12a. First oil port; 12b. Second oil port; 12c. Third oil port; 12d. Pilot reversing end; 13. Pressure oil inlet; 14. Pressure oil outlet; 2. System main valve; 21. First multi-way valve; 211. Breaker valve disc; 212. First oil inlet; 22. Second multi-way valve; 221. Internal bypass oil circuit; 222. Second oil inlet; 3. Breaker unit; 31. Inlet converging pipeline; 4. Control unit; 41. First pilot control valve; 42. Second pilot control valve; 43. Pilot oil inlet circuit; 44. Pilot oil return circuit; 51. First oil pump; 52. Second oil pump. DETAILED DESCRIPTION

[0028] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0029] The external converging logic valve 1 of the present invention will be described below with reference to the accompanying drawings.

[0030] like Figure 2 As shown, the utility model provides an external converging logic valve 1 , comprising a cartridge valve 11 , a pressure oil inlet 13 , a reversing valve 12 and a pressure oil outlet 14 .

[0031] The cartridge valve 11 is provided with a working chamber 11a, a spring control chamber 11b and a valve core drive chamber 11c. A control spring is provided in the spring control chamber 11b for pushing the valve core of the cartridge valve 11 toward the valve core drive chamber 11c.

[0032] The pressure oil inlet 13 is in communication with the valve core drive chamber 11 c . The pressure oil inlet 13 is used to guide the system pressure oil output by the oil pump to the valve core drive chamber 11 c of the cartridge valve 11 .

[0033] The reversing valve 12 includes a first working side and a second working side. The first working side is hydraulically connected to the pressure oil inlet 13, and the second working side is hydraulically connected to the spring control chamber 11b. The reversing valve 12 is used to guide the hydraulic oil in the pressure oil inlet 13 to the spring control chamber 11b or to relieve pressure in the spring control chamber 11b.

[0034] The pressure oil outlet 14 is connected to the working chamber 11a. When the valve core of the cartridge valve 11 moves and the working chamber 11a and the valve core drive chamber 11c are connected, the hydraulic oil in the pressure oil inlet 13 can flow out from the pressure oil outlet 14 through the valve core drive chamber 11c and the working chamber 11a in sequence.

[0035] By driving the reversing valve 12 to switch the direction, the on-off control between the pressure oil inlet 13 and the pressure oil outlet 14 can be achieved. Specifically, when the reversing valve 12 is in the valve position that directs the hydraulic oil in the pressure oil inlet 13 to the spring control chamber 11b, the hydraulic oil in the pressure oil inlet 13 will pass through the reversing valve 12 and enter the spring control chamber 11b of the cartridge valve 11. The spring control chamber 11b is at high pressure, the valve core of the cartridge valve 11 remains closed, and the working chamber 11a and the valve core drive chamber 11c are cut off. When the reversing valve 12 controls the spring control chamber 11b to release pressure, the spring control chamber 11b is at low pressure. At this time, the hydraulic oil in the pressure oil inlet 13 will enter the valve core drive chamber 11c and push the valve core of the cartridge valve 11 toward the spring control chamber 11b. At this time, the valve core opens, and the working chamber 11a and the valve core drive chamber 11c are connected. When the valve core needs to be closed, it is only necessary to switch the reversing valve 12 again to the valve position that directs the hydraulic oil of the pressure oil inlet 13 to the spring control chamber 11b. At this time, after the hydraulic oil of the pressure oil inlet 13 enters the spring control chamber 11b, it will push the valve core to close quickly, thereby achieving a rapid response of the cartridge valve 11 to close.

[0036] In summary, the external converging logic valve 1 in the present invention connects the first working side of the reversing valve 12 to the pressure oil inlet 13, and the second working side to the spring control chamber 11b, and controls the reversing of the reversing valve 12 to realize the opening and closing control of the cartridge valve 11. When the cartridge valve 11 is closed, the reversing valve 12 can directly guide the hydraulic oil of the pressure oil inlet 13 to the spring control chamber 11b, thereby realizing the rapid closure of the valve core of the cartridge valve 11 and greatly increasing the response speed of the closing of the cartridge valve 11.

[0037] like Figure 2As shown, in the embodiment of the present invention, the reversing valve 12 is provided with a first oil port 12a and a second oil port 12b on the first working side, and a third oil port 12c on the second working side. The first oil port 12a communicates with the pressure oil inlet 13, the second oil port 12b communicates with the working chamber 11a, and the third oil port 12c communicates with the spring control chamber 11b. The reversing valve 12 is configured to select one of the first and second oil ports 12a, 12b for communication with the third oil port 12c. In other words, pressure relief in the spring control chamber 11b refers to the hydraulic oil in the spring control chamber 11b flowing to the working chamber 11a for relief. This pressure relief method can further accelerate the opening response speed of the cartridge valve 11. Of course, the second oil port 12b can also communicate with a pressure relief return line.

[0038] like Figure 2 As shown, in the embodiment of the present utility model, the reversing valve 12 is preferably a two-position three-way valve and includes a first valve position ( Figure 2 Right valve position) and second valve position ( Figure 2 In the first valve position, the first oil port 12a and the third oil port 12c are connected and the second oil port 12b is blocked. In the second valve position, the second oil port 12b and the third oil port 12c are connected and the first oil port 12a is blocked. Of course, the reversing valve 12 can also be other types of valves.

[0039] like Figure 2 As shown, in an embodiment of the present utility model, the reversing valve 12 can be a pilot reversing valve and includes a pilot reversing end 12d arranged near the second valve position and a spring return end arranged near the first valve position. The spring return end is provided with a return spring for controlling the reversing valve 12 to remain in the first valve position when the pilot reversing end 12d is low-pressure oil.

[0040] In an embodiment of the present utility model, the reversing valve 12 may also be an electromagnetic reversing valve and includes an electromagnetic reversing end arranged near the second valve position and a spring return end arranged near the first valve position.

[0041] like Figure 3 、 Figure 4 and Figure 5As shown, in order to achieve the above-mentioned purpose, the utility model also provides an excavator hydraulic system, which includes a system main valve 2, an external converging logic valve 1, a breaker hammer unit 3 and a control unit 4. The system main valve 2 includes a first multi-way valve 21 provided with a first oil inlet 212 and a second multi-way valve 22 provided with a second oil inlet 222. The first multi-way valve 21 includes a breaker hammer valve plate 211, and the second multi-way valve 22 is provided with an internal bypass oil circuit 221 leading from the second oil inlet 222. The external converging logic valve 1 is the external converging logic valve 1 described above, and the pressure oil inlet 13 of the external converging logic valve 1 is connected to the internal bypass oil circuit 221. The oil inlet end of the breaker hammer unit 3 is respectively connected to the breaker hammer working oil port of the breaker hammer valve plate 211 and the pressure oil outlet 14 of the external converging logic valve 1. The control unit 4 is used to control the breaker hammer valve plate 211 and the reversing valve 12 to perform reversing respectively.

[0042] By adding an external converging logic valve 1 for controlling the breaker hammer on the outside of the system main valve 2 of the excavator hydraulic system, and adding an internal bypass oil circuit 221 leading from the second oil inlet 222 in the second multi-way valve 22 of the system main valve 2, and connecting the pressure oil inlet 13 of the external converging logic valve 1 to the internal bypass oil circuit 221, the pressure oil can be supplied to the breaker hammer unit 3 through the first oil inlet 212 and the breaker hammer valve plate 211, and can also be supplied to the breaker hammer unit 3 through the second oil inlet 222, the internal bypass oil circuit 221, the pressure oil inlet 13, the cartridge valve 11, and the pressure oil outlet 14, thereby realizing dual oil circuit oil supply of the breaker hammer unit 3 and making the oil supply method more flexible.

[0043] like Figure 3 As shown, in an embodiment of the present utility model, the first oil inlet 212 is connected to the first oil pump 51, and the second oil inlet 222 is connected to the second oil pump 52. By adding an external converging logic valve 1, the system can realize the functions of the first oil pump 51 supplying oil to the breaker hammer unit 3 alone, the second oil pump 52 supplying oil to the breaker hammer unit 3 alone, the first oil pump 51 and the second oil pump 52 supplying oil to the breaker hammer unit 3 at the same time, and the first oil pump 51 and the second oil pump 52 supplying oil to the breaker hammer unit 3 alternately.

[0044] like Figure 3 and Figure 4As shown, in this embodiment of the present invention, the hammer valve disc 211 includes a shutoff valve position for controlling the connection between the first oil inlet 212 and the hammer operating oil port, and a hammer operating valve position for controlling the connection between the first oil inlet 212 and the hammer operating oil port. The hammer operating oil port is connected to the hammer unit 3. The control unit 4 is used to control the switching of the hammer valve disc 211 between the shutoff valve position and the hammer operating valve position. By controlling the control unit 4 to switch the hammer valve disc 211 to the hammer operating valve position, the first oil pump 51 can supply oil to the hammer unit 3. By controlling the control unit 4 to switch the hammer valve disc 211 to the shutoff valve position, the first oil pump 51 can stop supplying oil to the hammer unit 3.

[0045] like Figure 3 and Figure 4 As shown, in an embodiment of the present utility model, the control unit 4 may include a first pilot control valve 41, one side of the first pilot control valve 41 is connected to the pilot oil inlet circuit 43 and the pilot oil return circuit 44, and the other side is connected to the reversing end of the breaker hammer valve disc 211 close to the breaker hammer working valve position. The first pilot control valve 41 is used to guide the hydraulic oil in the pilot oil inlet circuit 43 to the reversing end of the breaker hammer valve disc 211 or to provide pressure relief and oil return to the reversing end of the breaker hammer valve disc 211.

[0046] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the first pilot control valve 41 can be a two-position three-way valve. When the first pilot control valve 41 is in Figure 4 When the valve is in the left position, the reversing end of the breaker valve plate 211 releases pressure and returns oil, and the breaker valve plate 211 is in Figure 4 In the middle stop valve position, when the first pilot control valve 41 is in Figure 4 When the valve is in the right position, oil enters the reversing end of the breaker valve disc 211, and the breaker valve disc 211 switches to the breaker working valve position ( Figure 4 (left valve position in the middle), the first oil pump 51 supplies oil to the breaking hammer unit 3.

[0047] like Figure 3 and Figure 5 As shown, in an embodiment of the present utility model, the control unit 4 includes a second pilot control valve 42, one side of the second pilot control valve 42 is connected to the pilot oil inlet circuit 43 and the pilot oil return circuit 44, and the other side is connected to the pilot reversing end 12d of the reversing valve 12. The second pilot control valve 42 is used to guide the hydraulic oil in the pilot oil inlet circuit 43 to the pilot reversing end 12d of the reversing valve 12 or to relieve pressure and return oil to the pilot reversing end 12d of the reversing valve 12.

[0048] like Figure 1 and Figure 5 As shown, the second pilot control valve 42 can also be a two-position three-way valve. When the first pilot control valve 41 is in Figure 5 When the pilot reversing end 12d of the reversing valve 12 is in the pressure relief state, the reversing valve 12 is in the first valve position, the cartridge valve 11 is in the cut-off state, and the first pilot control valve 41 is in the Figure 5 When the valve is in the right position, the cartridge valve 11 is turned on, and the second oil pump 52 supplies oil to the breaker hammer unit 3 through the cartridge valve 11.

[0049] like Figure 3 As shown, in the embodiment of the present invention, the oil inlet end of the breaker hammer unit 3 is provided with an inlet merging line 31, a one-way valve is provided between the pressure oil outlet 14 and the inlet merging line 31, and the breaker hammer working oil port of the breaker hammer valve plate 211 is connected to the inlet merging line 31. The provision of the one-way valve prevents oil from the first oil pump 51 from flowing into the pressure oil outlet 14 of the external merging logic valve 1, thereby affecting the normal operation of the cartridge valve 11.

[0050] To achieve the above object, the present invention further provides an excavator, wherein the excavator includes the excavator hydraulic system described above. Since the excavator adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the above embodiments, which will not be repeated here.

[0051] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0054] Although the embodiments of the present invention have been described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An external converging logic valve, characterized in that: The external converging logic valve includes: A cartridge valve (11) is provided with a working chamber (11a), a spring control chamber (11b) and a valve core drive chamber (11c); A pressure oil inlet (13) is connected to the valve core driving chamber (11c); a reversing valve (12), comprising a first working side and a second working side, wherein the first working side is hydraulically connected to the pressure oil inlet (13), and the second working side is hydraulically connected to the spring control chamber (11b), and the reversing valve (12) is used to guide the hydraulic oil in the pressure oil inlet (13) to the spring control chamber (11b) or to connect the spring control chamber (11b) and the working chamber (11a); and The pressure oil outlet (14) is communicated with the working chamber (11a).

2. The external merging logic valve according to claim 1, characterized in that: The first working side is provided with a first oil port (12a) and a second oil port (12b), and the second working side is provided with a third oil port (12c). The first oil port (12a) is connected to the pressure oil inlet (13), the second oil port (12b) is connected to the working chamber (11a), and the third oil port (12c) is connected to the spring control chamber (11b). The reversing valve (12) is used to select one of the first oil port (12a) and the second oil port (12b) to be connected to the third oil port (12c).

3. The external merging logic valve according to claim 2, characterized in that: The reversing valve (12) is a two-position three-way valve and includes a first valve position and a second valve position. The first valve position is configured so that the first oil port (12a) and the third oil port (12c) are connected and the second oil port (12b) is blocked. The second valve position is configured so that the second oil port (12b) and the third oil port (12c) are connected and the first oil port (12a) is blocked.

4. The external merging logic valve according to claim 3, characterized in that: The reversing valve (12) is a pilot reversing valve and comprises a pilot reversing end (12d) arranged near the second valve position and a spring return end arranged near the first valve position. The spring return end is provided with a return spring for controlling the reversing valve (12) to remain at the first valve position when the pilot reversing end (12d) is low-pressure oil.

5. An excavator hydraulic system, characterized in that: The excavator hydraulic system includes: The system main valve (2) comprises a first multi-way valve (21) provided with a first oil inlet (212) and a second multi-way valve (22) provided with a second oil inlet (222), wherein the first multi-way valve (21) comprises a breaker hammer valve plate (211), and the second multi-way valve (22) is provided with an internal bypass oil path (221) leading from the second oil inlet (222); An external merging logic valve (1), wherein the external merging logic valve (1) is the external merging logic valve (1) according to any one of claims 1 to 4, and the pressure oil inlet (13) of the external merging logic valve (1) is connected to the internal bypass oil circuit (221); The oil inlet end of the breaker hammer unit (3) is respectively connected to the breaker hammer working oil port of the breaker hammer valve plate (211) and the pressure oil outlet (14) of the external converging logic valve (1); The control unit (4) is used to control the breaker hammer valve plate (211) and the reversing valve (12) to respectively perform reversing.

6. The hydraulic system for an excavator according to claim 5, characterized in that: The breaker hammer valve plate (211) comprises a stop valve position for controlling the cutoff between the first oil inlet (212) and the breaker hammer working oil port, and a breaker hammer working valve position for controlling the conduction between the first oil inlet (212) and the breaker hammer working oil port, and the control unit (4) is used to control the breaker hammer valve plate (211) to switch between the stop valve position and the breaker hammer working valve position.

7. The hydraulic system for an excavator according to claim 6, characterized in that: The control unit (4) comprises a first pilot control valve (41), one side of the first pilot control valve (41) being connected to a pilot oil inlet circuit (43) and a pilot oil return circuit (44), and the other side being connected to a reversing end of the breaker hammer valve disc (211) close to the breaker hammer working valve position. The first pilot control valve (41) is used to guide the hydraulic oil of the pilot oil inlet circuit (43) to the reversing end of the breaker hammer valve disc (211) or to relieve pressure and return oil to the reversing end of the breaker hammer valve disc (211).

8. The hydraulic system for an excavator according to claim 5, characterized in that: The control unit (4) includes a second pilot control valve (42), one side of the second pilot control valve (42) is connected to a pilot oil inlet circuit (43) and a pilot oil return circuit (44), and the other side is connected to the pilot reversing end (12d) of the reversing valve (12). The second pilot control valve (42) is used to guide the hydraulic oil of the pilot oil inlet circuit (43) to the pilot reversing end (12d) of the reversing valve (12) or to relieve pressure and return oil to the pilot reversing end (12d) of the reversing valve (12).

9. The hydraulic system for an excavator according to any one of claims 5 to 8, characterized in that: The oil inlet end of the breaker hammer unit (3) is provided with an inlet merging pipeline (31), a one-way valve is provided between the pressure oil outlet (14) and the inlet merging pipeline (31), and the breaker hammer working oil port of the breaker hammer valve plate (211) is connected to the inlet merging pipeline (31).

10. An excavator, characterized in that: The hydraulic system comprises the excavator hydraulic system according to any one of claims 5 to 9.

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