A valve external confluence hydraulic system and excavator

Abstract

An external-valve confluence hydraulic system and an excavator, relating to the field of hydraulic control technology for excavators, wherein the external-valve confluence hydraulic system comprises a hydraulic energy supply module, a starting module, a confluence module, a control module, a main valve and a breaker, wherein the hydraulic energy supply module comprises at least two hydraulic pumps, each of which can supply oil to the main valve; the confluence module is connected to the main valve in parallel, and the confluence module is connected between the starting module and the breaker, and each hydraulic pump is connected to the confluence module; the starting module is connected to the confluence module through the control module, and after the starting module is started, the control module controls the confluence module so that n hydraulic pumps supply oil to the breaker through the confluence module, where n is a natural number, and n is greater than or equal to zero and less than or equal to the number of the hydraulic pumps. Using the external-valve confluence hydraulic system provided by the present application to supply oil to the breaker can meet the oil supply requirements of breakers with drill rods of different sizes, with low pressure loss and high energy utilization.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control of excavators, and in particular to an external-valve confluence hydraulic system and an excavator. Background Art

[0002] An excavator, also known as an excavating machine or a backhoe, is an earth-moving machine that uses a bucket to dig materials above or below the surface of the machine and load them into a transport vehicle or unload them to a stockpile. The materials excavated by the excavator are mainly soil, coal, silt, and pre-loosened soil and rocks. The development of excavators is relatively fast, and excavators have become one of the main construction machinery in engineering construction.

[0003] After the breaker hammer is installed on the excavator, the breaker hammer can be used for breaker operation. The excavator supplies oil to the breaker hammer through the hydraulic system. In the prior art, the hydraulic system includes a main valve and a main pump. The main valve is connected to multiple devices (including the breaker hammer) in the excavator. The main pump supplies oil to the main valve and supplies oil to multiple devices in the excavator through the main valve.

[0004] However, due to the complexity of the internal pipeline of the main valve, when the main pump supplies oil to the breaker through the main valve, the oil flows over a long distance in the internal pipeline of the main valve, resulting in large pressure loss and low energy utilization. Summary of the invention

[0005] The object of the present invention is to provide an external-valve confluence hydraulic system and an excavator, which can solve the above-mentioned technical problems to a certain extent.

[0006] The present invention is achieved in that:

[0007] An external confluence hydraulic system includes: a hydraulic energy supply module, a start module, a confluence module, a control module, a main valve and a breaker, wherein:

[0008] The hydraulic energy supply module includes at least two hydraulic pumps, each of which can supply oil to the main valve;

[0009] The merging module is connected in parallel with the main valve, and the merging module is connected between the starting module and the breaking hammer, and each of the hydraulic pumps is connected to the merging module;

[0010] The starting module is connected to the merging module through the control module. After the starting module is started, the control module controls the merging module so that n hydraulic pumps supply oil to the breaker hammer through the merging module, where n is a natural number greater than or equal to zero and less than or equal to the number of the hydraulic pumps.

[0011] In a feasible implementation manner, the merging module includes a merging valve group, and each of the hydraulic pumps is connected to the merging valve group.

[0012] In a feasible implementation, the merging module includes at least two merging valve blocks, the number of the merging valve blocks is the same as the number of the hydraulic pumps, and the multiple merging valve blocks are connected to the multiple hydraulic pumps in a one-to-one correspondence.

[0013] In a feasible implementation, the starting module is connected to the merging module via a first oil circuit. After the starting module is started, the pilot oil flows to the merging module via the first oil circuit to start the merging module.

[0014] In a feasible implementation, the starting module is connected to the main valve through a second oil circuit. After the starting module is started, the pilot oil flows to the main valve through the second oil circuit, so that the hydraulic energy supply module supplies oil to the main valve and the breaker at the same time.

[0015] In a feasible implementation, the first oil circuit and / or the second oil circuit is provided with a pressure detection device.

[0016] In a feasible implementation, the external-valve confluence hydraulic system further includes a proportional solenoid valve, which is connected to the main valve and is used to realize pressure control of the overflow valve in the main valve.

[0017] In a feasible implementation scheme, the hydraulic energy supply module includes a first hydraulic pump and a second hydraulic pump, the confluence module includes a first confluence valve block and a second confluence valve block, the control valve includes a first control valve and a second control valve, the first hydraulic pump is connected to the breaker hammer through the first confluence valve block, the second hydraulic pump is connected to the breaker hammer through the second confluence valve block, the first control valve is connected to the first confluence valve block, and the second control valve is connected to the second confluence valve block.

[0018] An excavator comprises the external-valve confluence hydraulic system provided by the above technical solution.

[0019] The beneficial effects of the present invention include at least:

[0020] The valve-outside confluence hydraulic system provided in the present application can be applied to an excavator to supply energy to a breaker hammer. Specifically, when the excavator is performing excavation work normally, the hydraulic energy supply module supplies oil to the main valve to supply oil to other devices in the excavator through the main valve. After the start module is started, the control module controls the confluence module so that the breaker hammer is supplied with oil by the n hydraulic pumps in the hydraulic energy supply module. n is a natural number, n is greater than or equal to zero and less than or equal to the number of the hydraulic pumps, that is, when two hydraulic pumps are provided in the hydraulic energy supply module, the confluence module can be controlled by the control module so that one of the hydraulic pumps supplies oil to the breaker hammer through the confluence module, or both hydraulic pumps can supply oil to the breaker hammer through the confluence module, or the confluence module can be closed to temporarily stop the hydraulic pump from supplying oil to the breaker hammer. When the hydraulic energy supply module includes multiple hydraulic pumps, the control module can control the merging module so that any one of the hydraulic pumps can supply oil to the breaker hammer through the merging module, or several or all of the hydraulic pumps can supply oil to the breaker hammer through the merging module. Alternatively, the merging module can be closed to temporarily stop the hydraulic pump from supplying oil to the breaker hammer.

[0021] Since the main valve and the confluence module are connected in parallel in the external confluence hydraulic system provided by the present application, the hydraulic energy supply module supplies oil to the breaker hammer through the confluence module without passing through the main valve, so that the flow distance of the oil is short, the pressure loss is small, and the energy loss is small. Since the start module can be controlled by the control module to control the number of hydraulic pumps used to supply oil to the breaker hammer, the needs of the breaker hammers with drill rods of different sizes can be met.

[0022] In summary, the use of the external valve confluence hydraulic system provided in the present application to supply oil to a breaker hammer can meet the oil supply requirements of breakers with drill rods of different sizes, with low pressure loss and high energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of the external-valve confluence hydraulic system provided by an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Partial schematic diagram of the hydraulic system with confluence outside the middle valve;

[0026] Figure 3 A schematic structural diagram of another external-valve confluence hydraulic system provided by an embodiment of the present invention;

[0027] Figure 4 for Figure 3 Partial schematic diagram of the hydraulic system with external confluence of the middle valve.

[0028] In the figure:

[0029] 10-main valve; 11-left connection of main valve; 12-right connection of main valve;

[0030] 21-first hydraulic pump; 22-second hydraulic pump;

[0031] 31-first confluence valve block; 32-second confluence valve block; 33-confluence valve group;

[0032] 41-first control valve; 42-second control valve;

[0033] 50- Crushing pilot valve; 60- Proportional solenoid valve; 70- Pressure switch; 80- Breaking hammer. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] First embodiment

[0042] Please refer to Figure 1-Figure 4 This embodiment provides a valve-outside confluence hydraulic system, which includes: a hydraulic energy supply module, a start module, a confluence module, a control module, a main valve 10 and a breaker 80, wherein:

[0043] The hydraulic energy supply module includes at least two hydraulic pumps, each of which can supply oil to the main valve 10;

[0044] The merging module is connected in parallel with the main valve, and the merging module is connected between the starting module and the breaker 80, and each hydraulic pump is connected to the merging module;

[0045] The starting module is connected to the merging module through the control module. After the starting module is started, the control module controls the merging module so that n hydraulic pumps supply oil to the breaker 80 through the merging module, where n is a natural number greater than or equal to zero and less than or equal to the number of hydraulic pumps.

[0046] In a feasible implementation, the starting module is connected to the merging module through a first oil circuit. After the starting module is started, the pilot oil flows to the merging module through the first oil circuit to start the merging module.

[0047] In a specific embodiment, the starting module includes a crushing pilot valve 50, which is connected to a pilot oil pipeline. The pilot oil enters the crushing pilot valve 50 via the pilot oil pipeline. When the crushing pilot valve 50 is opened, the pilot oil flows into the first oil circuit through the crushing pilot valve 50, and flows to the merging module through the first oil circuit, thereby starting the merging module so that the hydraulic pump can supply oil to the breaker 80 through the merging module.

[0048] The crushing pilot valve 50 can be manually controlled or automatically controlled. When automatically controlled, the crushing pilot valve 50 is connected to the control system of the excavator, so that the control system of the excavator controls whether the crushing pilot valve 50 is started or not according to the required operation mode. When manually controlled, the crushing pilot valve 50 can be connected to a foot pedal or a manual switch, so that the driver can start the crushing operation mode through the foot pedal or the manual switch.

[0049] In a specific embodiment, the control module is installed in the first oil circuit and is located between the starting module and the merging module. The control module can control the opening and closing degree of the first oil circuit. In this way, when the starting module is started, the pilot oil flows along the first oil circuit to the control module. If the control module is turned on, the pilot oil can continue to flow to the merging module to turn on the merging module, so that the hydraulic pump can supply oil to the breaker 80 through the merging module. If the control module is not turned on, the hydraulic pump cannot supply oil to the breaker 80 through the merging module.

[0050] Specifically, the control module includes control valves, the number of which is the same as the number of hydraulic pumps, and different control valves are connected to different parts in the confluence module to control different hydraulic pumps.

[0051] In a preferred implementation manner of this embodiment, the starting module is connected to the main valve 10 through a second oil circuit. After the starting module is started, the pilot oil flows to the main valve 10 through the second oil circuit, so that the hydraulic energy supply module can supply oil to the main valve 10 and the breaker 80 at the same time.

[0052] In a feasible implementation, the first oil circuit and / or the second oil circuit is provided with a pressure detection device. That is, the pressure detection device may be provided only in the first oil circuit, or only in the second oil circuit, or both in the first oil circuit and the second oil circuit. Alternatively, when the first oil circuit is connected to the second oil circuit, the pressure detection device may be provided at the intersection of the first oil circuit and the second oil circuit.

[0053] The pressure detection device detects the pressure of the first oil circuit and / or the second oil circuit, thereby determining whether the excavator is in a crushing operation mode or an excavation operation mode.

[0054] Specifically, the pressure detection device may include a pressure switch 70 .

[0055] In a specific embodiment, the first oil circuit and the second oil circuit are respectively connected to the starting module, and the pilot oil enters the first oil circuit and the second oil circuit respectively through the starting module.

[0056] Alternatively, in a preferred embodiment, the first oil circuit is directly connected to the starting module, and the second oil circuit is connected to the first oil circuit. In this configuration, when the starting module is started, the pilot oil first flows into the first oil circuit, and after flowing along the first oil circuit for a distance, part of the pilot oil enters the second oil circuit to flow to the main valve 10, and the other part of the pilot oil continues to flow along the first oil circuit to flow to the control valve.

[0057] Alternatively, in another preferred embodiment, the second oil circuit is directly connected to the starting module, and the first oil circuit is connected to the second oil circuit. In this arrangement, when the starting module is started, the pilot oil first flows into the second oil circuit, and after flowing along the second oil circuit for a distance, part of the pilot oil enters the first oil circuit to flow to the control valve, and the other part of the pilot oil continues to flow along the second oil circuit to flow to the main valve 10.

[0058] Furthermore, the control valve may be a solenoid valve, which is a normally closed type. After power is turned on, the solenoid valve opens to allow the pilot oil to flow to the merging module, thereby opening the merging module.

[0059] When the pressure switch 70 detects the pressure, different control states can be achieved by controlling the power supply of the control valve.

[0060] In a feasible implementation, the external-valve confluence hydraulic system further includes a proportional solenoid valve 60 , which is connected to the main valve 10 and is used to realize pressure control of the overflow valve in the main valve 10 .

[0061] Specifically, the proportional solenoid valve 60 can output different control pressures according to different input currents to achieve pressure control of the relief valve of the main valve 10. The system pressure is set to p1 in the crushing operation mode, and the system pressure is set to p2 in the excavation operation mode, respectively meeting the different requirements of the crushing operation mode and the excavation operation mode; and the system pressure p2 in the crushing operation mode can be adjusted according to the differences in working conditions in the crushing operation mode and the differences in the breaker hammer 80 of the excavator.

[0062] Second embodiment

[0063] Please refer to Figure 1 and Figure 2This embodiment provides an off-valve confluent hydraulic system, which is an improvement on the off-valve confluent hydraulic system provided in the above-mentioned first embodiment. The technical contents disclosed in the first embodiment will not be described repeatedly, and the contents disclosed in the first embodiment also belong to the contents disclosed in this embodiment.

[0064] In this embodiment, the confluence module includes a confluence valve group 33, and each hydraulic pump is connected to the confluence valve group 33. Specifically, the confluence valve group 33 includes a plurality of flow control parts connected to each other, and each hydraulic pump is connected to a different flow control part, so that the output flow of each hydraulic pump can be controlled separately through the different flow control parts. Each flow control part is connected to the main valve 10 in parallel.

[0065] In this embodiment, the control module includes at least two control valves, the number of the control valves is the same as the number of the hydraulic pumps, and each control valve is connected to the confluence module.

[0066] Corresponding to the above-mentioned confluence module, each flow control unit is connected to a control valve, so as to connect the flow control unit connected thereto through the control valve, thereby controlling the amount of oil outputted by the hydraulic pump connected to the flow control unit to the breaker 80 .

[0067] The following describes the external-valve confluence hydraulic system provided in this embodiment by taking the hydraulic energy supply module including two hydraulic pumps as an example:

[0068] The hydraulic energy supply module includes a first hydraulic pump 21 and a second hydraulic pump 22, the merging module includes a merging valve group 33, the merging valve group 33 includes a first flow control part and a second flow control part, the first hydraulic pump 21 is connected to the breaker 80 through the first flow control part, the second hydraulic pump 22 is connected to the breaker 80 through the second flow control part, the first control valve 41 is connected to the first flow control part, and the second control valve 42 is connected to the second flow control part.

[0069] In addition, in the main valve 10, including the main valve left link 11 and the main valve right link 12, the first hydraulic pump 21 can supply oil to the main valve left link 11, and the second hydraulic pump 22 can supply oil to the main valve right link 12. Correspondingly, in the converging valve group 33, the first flow control unit is connected in parallel with the main valve left link 11, and the second flow control unit is connected in parallel with the main valve right link 12, so that the first hydraulic pump 21 can supply oil to the breaker 80 and the main valve left link 11 at the same time, and the second hydraulic pump 22 can supply oil to the breaker 80 and the main valve right link 12 at the same time.

[0070] Furthermore, the control valve may be a solenoid valve, which is a normally closed type. After power is turned on, the solenoid valve opens to allow the pilot oil to flow to the merging module, thereby opening the merging module.

[0071] When the pressure switch 70 detects the pressure, the following different control states can be achieved by changing the power supply status of the control valve:

[0072] (1) The first control valve 41 and the second control valve 42 are both energized, the first flow control unit and the second flow control unit in the merging valve group 33 are both in the working position, and the first hydraulic pump 21 and the second hydraulic pump 22 supply oil to the breaker 80 through the first flow control unit and the second flow control unit corresponding thereto, respectively, to realize the full external merging of the two pumps.

[0073] (2) The first control valve 41 is energized, the second control valve 42 is de-energized, the first flow control unit is in the working position, the second flow control unit is in the non-working position, and oil is supplied to the breaker 80 through the first hydraulic pump 21 .

[0074] (3) The first control valve 41 is not energized, the second control valve 42 is energized, the first flow control unit is in the non-operating position, the second flow control unit is in the operating position, and oil is supplied to the breaker 80 through the second hydraulic pump 22 .

[0075] (4) The first control valve 41 and the second control valve 42 are both de-energized, the first flow control unit and the second flow control unit in the merging valve group 33 are both in the non-working position, and the first hydraulic pump 21 and the second hydraulic pump 22 do not supply oil to the breaker 80 .

[0076] Third embodiment

[0077] Please refer to Figure 3 and Figure 4 This embodiment provides an off-valve confluent hydraulic system, which is an improvement on the off-valve confluent hydraulic system provided in the above-mentioned first embodiment. The technical contents disclosed in the first embodiment will not be described repeatedly, and the contents disclosed in the first embodiment also belong to the contents disclosed in this embodiment.

[0078] In this embodiment, the merging module includes at least two merging valve blocks, the number of the merging valve blocks is the same as the number of the hydraulic pumps, and the multiple merging valve blocks are connected to the multiple hydraulic pumps in a one-to-one correspondence.

[0079] The plurality of hydraulic pumps are connected to the main valve through the main valve pipeline, and each confluence valve block is connected in parallel with the corresponding main valve pipeline. The plurality of confluence valve blocks can be connected to the breaker 80 respectively, or, preferably, the plurality of confluence valve blocks are connected in parallel and then connected to the breaker 80.

[0080] In this embodiment, the control module includes at least two control valves, the number of the control valves is the same as the number of the hydraulic pumps, and each control valve is connected to the confluence module.

[0081] Corresponding to the above-mentioned merging modules, each merging valve block is connected to a control valve, so as to connect the merging valve block connected thereto through the control valve, thereby controlling the amount of oil outputted by the hydraulic pump connected to the merging valve block to the breaker 80 .

[0082] In a feasible implementation scheme, the hydraulic energy supply module includes a first hydraulic pump 21 and a second hydraulic pump 22, the confluence module includes a first confluence valve block 31 and a second confluence valve block 32, the control valve includes a first control valve 41 and a second control valve 42, the first hydraulic pump 21 is connected to the breaker 80 through the first confluence valve block 31, the second hydraulic pump 22 is connected to the breaker 80 through the second confluence valve block 32, the first control valve 41 is connected to the first confluence valve block 31, and the second control valve 42 is connected to the second confluence valve block 32.

[0083] In addition, in the main valve 10, including the main valve left link 11 and the main valve right link 12, the first hydraulic pump 21 can supply oil to the main valve left link 11, and the second hydraulic pump 22 can supply oil to the main valve right link 12. Correspondingly, the first confluence valve block 31 is connected in parallel with the main valve left link 11, and the second confluence valve block 32 is connected in parallel with the main valve right link 12, so that the first hydraulic pump 21 can supply oil to the breaker 80 and the main valve left link 11 at the same time, and the second hydraulic pump 22 can supply oil to the breaker 80 and the main valve right link 12 at the same time.

[0084] Furthermore, the control valve may be a solenoid valve, which is a normally closed type. After power is turned on, the solenoid valve opens to allow the pilot oil to flow to the merging module, thereby opening the merging module.

[0085] When the pressure switch 70 detects the pressure, the following different control states can be achieved by changing the power supply status of the control valve:

[0086] (1) The first control valve 41 and the second control valve 42 are both energized, and the first control valve 41 and the second control valve 42 in the merging valve group 33 are both in the working position. The first hydraulic pump 21 and the second hydraulic pump 22 supply oil to the breaker 80 through the first control valve 41 and the second control valve 42 corresponding thereto, respectively, to realize the full external merging of the two pumps.

[0087] (2) The first control valve 41 is energized, and the second control valve 42 is not energized. The first control valve 41 is in the working position, and the second control valve 42 is in the non-working position. Oil is supplied to the breaker 80 through the first hydraulic pump 21 .

[0088] (3) The first control valve 41 is not energized, and the second control valve 42 is energized. The first control valve 41 is in the non-operating position, and the second control valve 42 is in the operating position. Oil is supplied to the breaker 80 through the second hydraulic pump 22 .

[0089] (4) The first control valve 41 and the second control valve 42 are both de-energized, the first control valve 41 and the second control valve 42 in the merging valve group 33 are both in the non-working position, and the first hydraulic pump 21 and the second hydraulic pump 22 do not supply oil to the breaker 80 .

[0090] Fourth embodiment

[0091] This embodiment provides an excavator, which includes the valve-outside confluent hydraulic system provided by the first embodiment, the second embodiment or the third embodiment. Furthermore, a plurality of working devices are provided in the excavator, each of which is connected to the main valve 10 in the valve-outside confluent hydraulic system to be controlled by the main valve 10.

[0092] The excavator provided in this embodiment has at least an excavation operation mode and a crushing operation mode.

[0093] When the excavator is in the excavation operation mode, the hydraulic pump in the hydraulic power supply module of the valve-outer confluence hydraulic system supplies oil to the main valve 10 , so as to supply oil to the working device in the excavator through the main valve 10 .

[0094] When the excavator is in the crushing operation mode, the oil in the hydraulic pump in the hydraulic power supply module of the external confluence hydraulic system is transported to the confluence module, and the control module controls the confluence module so that the oil of one or several hydraulic pumps flows to the breaker 80 through the confluence module to supply oil to the breaker 80. In the crushing operation mode, the control module can also control the confluence module to close to suspend the use of the hydraulic power supply device to supply oil to the breaker 80. Since the main valve 10 is connected to the confluence module in parallel, in the crushing operation mode, it can also be achieved that: while the hydraulic pump supplies oil to the breaker 80 through the confluence module, the hydraulic pump also supplies oil to the main valve 10.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An external confluence hydraulic system, characterized in that: include: Hydraulic power supply module, starting module, confluence module, control module, main valve and breaker, among which, The hydraulic energy supply module includes at least two hydraulic pumps, each of which can supply oil to the main valve; The merging module is connected in parallel with the main valve, and the merging module is connected between the starting module and the breaking hammer, and each of the hydraulic pumps is connected to the merging module; The starting module is connected to the merging module through the control module. After the starting module is started, the control module controls the merging module so that n hydraulic pumps supply oil to the breaker hammer through the merging module, where n is a natural number, which is greater than or equal to zero and less than or equal to the number of the hydraulic pumps. The confluence module includes at least two confluence valve blocks, the number of the confluence valve blocks is the same as the number of the hydraulic pumps, and the plurality of confluence valve blocks are connected to the plurality of hydraulic pumps in a one-to-one correspondence; The control module comprises at least two control valves, the number of the control valves is the same as the number of the confluence valve blocks, and the control valves are connected to the confluence modules in a one-to-one correspondence; The starting module is connected to the merging module through a first oil circuit. After the starting module is started, the pilot oil flows to the merging module through the first oil circuit to start the merging module. The hydraulic energy supply module includes a first hydraulic pump and a second hydraulic pump, the confluence module includes a first confluence valve block and a second confluence valve block, the control valve includes a first control valve and a second control valve, the first hydraulic pump is connected to the breaker hammer through the first confluence valve block, the second hydraulic pump is connected to the breaker hammer through the second confluence valve block, the first control valve is connected to the first confluence valve block, and the second control valve is connected to the second confluence valve block.

2. The external-valve confluence hydraulic system according to claim 1, characterized in that: The merging module includes a merging valve group, and each of the hydraulic pumps is connected to the merging valve group.

3. The external-valve confluence hydraulic system according to claim 1, characterized in that: The starting module is connected to the main valve via a second oil circuit. After the starting module is started, the pilot oil flows to the main valve via the second oil circuit, so that the hydraulic energy supply module supplies oil to the main valve and the breaker simultaneously.

4. The external-valve confluence hydraulic system according to claim 3, characterized in that: The first oil circuit and / or the second oil circuit is provided with a pressure detection device.

5. The external-valve confluence hydraulic system according to claim 1, characterized in that: It also includes a proportional solenoid valve, which is connected to the main valve and is used to achieve pressure control of the overflow valve in the main valve.

6. An excavator, characterized in that: It includes the external valve confluence hydraulic system as described in any one of claims 1-5.

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