CN219888383U - Valve external confluence hydraulic system for crushing and excavator - Google Patents

Abstract

The utility model relates to the technical field of excavators, in particular to a valve external confluence hydraulic system for crushing and an excavator. The valve external confluence hydraulic system for crushing comprises a crushing valve group, a positive flow control valve group, a hydraulic main pump module, a multi-way valve group and a crushing executing piece; the crushing valve group is independent of the outer part of the multi-way valve group and is communicated with the crushing executing piece; the hydraulic main pump module is communicated with the crushing valve group and the multi-way valve group; the hydraulic main pump module comprises a plurality of working pumps which can supply oil for the multi-way valve group; the multi-way valve group comprises a plurality of valve blocks communicated with the crushing valve group in a parallel manner; the positive flow control valve group comprises a plurality of positive flow control valves arranged at the oil circuit output end of the working pump. When the crushing operation is executed, the crushing valve group is in the working position, and the opening and closing of the positive flow control valve and the on-off state of the valve block are controlled, so that at least one working pump can supply oil to the crushing executing piece, and the oil supply switching of the single-pump or double-pump valve external confluence is realized.

Description

Valve external confluence hydraulic system for crushing and excavator

Technical Field

The utility model relates to the technical field of excavators, in particular to a valve external confluence hydraulic system for crushing and an excavator.

Background

Medium and large excavators typically employ dual-pump or multi-pump hydraulic systems. The common crushing hydraulic system of the excavator has the schemes of single-pump oil supply, double-pump valve inner confluence, single-pump valve outer confluence and the like.

When the excavator needs to execute crushing work, if a single pump oil supply scheme is adopted, only a drill rod with smaller specification can be additionally arranged, the crushing work efficiency is low, and the performance of the excavator cannot be effectively exerted.

If the double-pump valve internal confluence scheme is adopted, as shown in fig. 1, the valve internal confluence of the first pump 1' and the second pump 2' is realized by cutting off the right bypass cut-off valve 3', so that a drill rod with larger specification is additionally arranged, but because an oil passage in the valve is complex, larger pressure loss can be generated, on one hand, the waste of energy is caused, and on the other hand, a large amount of heat is generated to cause the high temperature of a hydraulic system, thereby influencing the performance and the service life of the excavator.

If the single pump valve external confluence scheme is adopted, as shown in fig. 2, the oil source of the second main pump 5 'and the oil source of the first main pump 4' passing through the valve core 7 'of the breaking hammer are converged and supplied to the drill rod through the external valve group 6', so that the valve external confluence of the single pump is realized, and part of the oil source still needs to pass through the oil duct in the valve, so that part of pressure loss still exists.

Disclosure of Invention

In view of the above, the utility model aims to provide a valve external confluence hydraulic system for crushing and an excavator, so as to solve the problems of low single-pump operation efficiency, large double-pump valve internal confluence pressure loss and poor single-pump valve external confluence control performance of the existing excavator breaking hammer hydraulic system.

The utility model provides a valve external confluence hydraulic system for crushing, which comprises a crushing valve group, a positive flow control valve group, a hydraulic main pump module, a multi-way valve group and a crushing executing piece, wherein the crushing valve group is connected with the hydraulic main pump module;

the crushing valve group is independent of the outside of the multi-way valve group and is communicated with the crushing executive component;

the hydraulic main pump module is respectively communicated with the crushing valve group and the multi-way valve group, and comprises a plurality of working pumps which can supply oil for the multi-way valve group;

the multi-way valve group comprises a plurality of valve blocks, the valve blocks are arranged in one-to-one correspondence with the working pumps, and the valve blocks are communicated with the crushing valve group in a parallel connection mode;

the positive flow control valve group comprises a plurality of positive flow control valves, and the positive flow control valves are arranged at the oil circuit output ends of the working pumps and are arranged in one-to-one correspondence with the working pumps so as to control whether the corresponding working pumps work or not;

when the crushing work is executed, the crushing valve group is in a working position, and at least one working pump can supply oil to the crushing executing piece by controlling the opening and closing of the positive flow control valve and the on-off state of the valve block.

Preferably, a bypass cut-off valve is arranged in the valve block;

when the working pump supplies oil to the crushing executing piece, the positive flow control valve corresponding to the working pump is opened, and the valve block is controlled to be in a bypass cut-off state by the bypass cut-off valve except the rest corresponding to the working pump.

Preferably, the valve external flow hydraulic system for crushing further comprises a pilot control valve in communication with the crushing valve group, the pilot control valve being used for controlling whether the crushing valve group works.

Preferably, the valve outer stream hydraulic system for fracturing further comprises a controller;

the positive flow control valve group, the multi-way valve group and the pilot control valve are respectively connected with the controller.

Preferably, the valve external flow hydraulic system for breaking further comprises a pressure sensor connected to the pilot control valve;

the output pressure of the pilot control valve can act on the crushing valve group to enable the crushing valve group to be in a working position, and the pressure sensor is used for collecting the output pressure of the pilot control valve and inputting a signal of the output pressure into the controller.

Preferably, the crushing valve group comprises a slide valve and one-way valves arranged at the inlet ends of the slide valve, and the one-way valves are arranged in one-to-one correspondence with the working pumps.

Preferably, the crushing valve group further comprises an overload oil compensating valve arranged at the outlet end of the slide valve.

Preferably, the working pump, the positive flow control valve and the valve block are all provided in two;

the multi-way valve group comprises a left valve block and a right valve block; the hydraulic main pump module comprises a first working pump and a second working pump, and the positive flow control valve group comprises a first positive flow control valve and a second positive flow control valve;

the first working pump, the first positive flow control valve and the left valve block are communicated; the second working pump, the second positive flow control valve and the right valve block are communicated;

the first working pump and the second working pump may be individually or jointly configured to supply oil to the crushing actuator.

Preferably, the crushing actuator is a hydraulic crushing hammer.

The second aspect of the utility model provides an excavator, which comprises the valve external flow hydraulic system for crushing according to any one of the above technical schemes.

Compared with the prior art, the utility model has the beneficial effects that:

according to the external-valve confluence hydraulic system for crushing, when crushing work is carried out, the crushing valve group is in a working position, and the opening and closing of the positive flow control valve and the on-off state of the valve block are controlled, so that at least one working pump can supply oil to the outside of the crushing executive component valve, and therefore oil supply switching of single-pump or double-pump valve external confluence is realized, crushing work efficiency is guaranteed, oil supply requirements of crushing executive components with different specifications are met, compared with a single-pump valve external confluence scheme, pressure loss is further reduced, high temperature of a hydraulic system caused by a large amount of heat is avoided, performance of an excavator is effectively exerted, and the service life of the excavator is prolonged.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a hydraulic schematic diagram of a dual pump valve internal confluence in the prior art;

FIG. 2 is a hydraulic schematic diagram of a single pump valve outer flow in the prior art;

FIG. 3 is a hydraulic schematic of a valve outer-flow hydraulic system for fracturing provided by an embodiment of the present utility model;

fig. 4 is a hydraulic schematic diagram of a breaking valve group in a valve outer confluence hydraulic system for breaking according to an embodiment of the present utility model.

Icon: 1' -a first pump; 2' -a second pump; a 3' -right bypass cut-off valve; 4' -primary pump one; a second 5' -main pump; 6' -external valve group; 7' -breaking hammer valve core; 11-a first working pump; 110-a first positive flow control valve; 12-a second working pump; 120-a second positive flow control valve; 13-a pilot pump; 21-left valve block; 211-a first bypass shut-off valve; 22-right valve block; 221-a second bypass shut-off valve; 30-crushing a valve group; 31-slide valve; 32-a one-way valve; 33-overload oil compensating valve; 40-pilot control valve; 41-a pressure sensor; 50-a controller; 60-breaking the executive.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after understanding the present disclosure.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent upon an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

According to a first aspect of the present utility model there is provided a valve external flow hydraulic system for fracturing comprising a fracturing valve block 30, a positive flow control valve block, a hydraulic main pump module, a multiplex valve block and a fracturing implement 60.

In this embodiment, as shown in fig. 3, the excavator includes an excavating mode and a crushing mode, the multiple valve block is a main valve in a hydraulic system of the excavator, and the hydraulic main pump module is respectively communicated with the crushing valve block 30 and the multiple valve block. The hydraulic main pump module comprises a pilot pump 13 and a plurality of working pumps, which can supply oil to the multiple-way valve group. The multiple valve block includes a plurality of valve blocks, the valve blocks are arranged in one-to-one correspondence with the working pumps, and the plurality of valve blocks are communicated with the crushing valve block 30 in a parallel manner. The breaker block 30 is provided separately from the exterior of the multiplex block and communicates with the breaker actuator 60. The positive flow control valve group comprises a plurality of positive flow control valves, and the positive flow control valves are arranged at the oil way output ends of the working pumps and are arranged in one-to-one correspondence with the working pumps so as to control whether the corresponding working pumps work or not.

When the excavator is in the crushing mode, the crushing executing member 60 is required to execute crushing work, at this time, the crushing valve group 30 is in a working position, and at least one working pump can supply oil to the crushing executing member 60 by controlling the opening and closing of the positive flow control valve and the on-off state of the valve block, and an oil path for supplying oil does not pass through the multi-way valve group, so that oil supply outside the valve is realized.

In this embodiment, as shown in fig. 3, the crushing actuator 60 is a hydraulic breaking hammer, such as a drill rod.

In one embodiment, as shown in FIG. 3, the working pump, positive flow control valve and valve block are all provided in two; specifically, the multiple valve block includes a left valve block 21 and a right valve block 22; the hydraulic main pump module comprises a first working pump 11 and a second working pump 12, and the positive flow control valve block comprises a first positive flow control valve 110 and a second positive flow control valve 120.

More specifically, the first working pump 11, the first positive flow control valve 110, and the left valve block 21 communicate; the second working pump 12, the second positive flow control valve 120, and the right valve block 22 are in communication; the first working pump 11 and the second working pump 12 can supply oil to the crushing executive component 60 individually or together, wherein when the first working pump 11 or the second working pump 12 supply oil to the crushing executive component 60 individually, the excavator is in a crushing mode of single pump oil supply; when the first working pump 11 and the second working pump 12 simultaneously supply oil to the crushing actuator 60, the excavator is in a crushing mode in which oil is supplied to the double pump.

In the present embodiment, as shown in fig. 4, the breaker group 30 includes a spool valve 31 and a check valve 32 provided at an inlet end of the spool valve 31, the check valve 32 being provided in one-to-one correspondence with the working pump. As described above, when the working pump is provided with two, the spool valve 31 is a two-position four-way valve, and the check valve 32 is provided correspondingly with two.

Further, the crushing valve group 30 further comprises an overload oil compensating valve 33 arranged at the outlet end of the slide valve 31, and the pressure of the overload oil compensating valve 33 is adjustable to meet the working pressure requirements of different crushing executing elements 60.

In this embodiment, as shown in fig. 3, a bypass cut valve is provided in the valve block, and when the working pump supplies oil to the crushing actuator 60, the positive flow control valve corresponding to the working pump is opened, and the rest of the bypass cut valve control valve blocks corresponding to the working pump are in a bypass cut state. The bypass shut-off valve is preferably a proportional solenoid valve, so that it can function by electrohydraulic mixing. As described above, when the multiple valve block includes the left valve block 21 and the right valve block 22, the first bypass shutoff valve 211 is in the left valve block 21, and the second bypass shutoff valve 221 is in the right valve block 22; the first working pump 11 communicates with the first bypass cut-off valve 211, and the second working pump 12 communicates with the second bypass cut-off valve 221, wherein when the first positive flow control valve 110 is opened, the second bypass cut-off valve 221 controls the right valve block 22 to be in a bypass cut-off state; when the second positive flow control valve 120 is opened, the first bypass cut valve 211 controls the left valve block 21 to be in a bypass cut state.

Further, in the present embodiment, as shown in fig. 3, the valve external flow hydraulic system for crushing further includes a pilot control valve 40 in communication with the crushing valve group 30, the pilot control valve 40 being used to control whether the crushing valve group 30 is operated. The pilot control valve 40 is communicated with the pilot pump 13, and the pilot control valve 40 is preferably hydraulically controlled, for example, a proportional electromagnetic valve can be adopted to realize the function, specifically, when the pilot control valve 40 adopts the proportional electromagnetic valve, the pilot control valve 40 can be controlled by the controller 50 to be described below to be electrified or not, and when the excavator is in the excavating mode, the operator can be prevented from operating the hammer by mistake, and the excavator has a certain foolproof effect.

Furthermore, in the present embodiment, as shown in fig. 3, the valve outer-flow hydraulic system for crushing further includes a controller 50 for coordinating and directing the operation of the entire system. The positive flow control valve block, the multiplex valve block and the pilot control valve 40 are each connected to a controller 50. The controller 50 can precisely control the output displacement size of the corresponding working pump and the opening area size of the bypass cut-off valve by controlling the current sizes of the positive flow control valve and the bypass cut-off valve in the multiple valve group, so that the flow rate supplied to the crushing valve group 30 can be precisely controlled.

Further, in the present embodiment, as shown in fig. 3, the valve external flow hydraulic system for crushing further includes a pressure sensor 41 connected to the pilot control valve 40; the output pressure of the pilot control valve 40 can act on the breaker block 30 such that the breaker block 30 is in an operating position, and the pressure sensor 41 is configured to collect the output pressure of the pilot control valve 40 and input a signal of the output pressure to the controller 50.

The following describes an operation mode of the excavator by taking an example in which the excavator is provided with two operation pumps:

in one embodiment, the excavator is in an excavating mode, in particular the crushing valve group 30 is in a non-working position, and the first working pump 11 and the second working pump 12 only supply oil to the multiple way valve group.

In another embodiment, the excavator is in a single pump oil feed crushing mode, for example, only the first working pump 11 feeds oil to the crushing actuator 60, in particular, the operator controls the pilot control valve 40 such that the output pressure of the pilot control valve 40 acts on the one hand on the crushing valve group 30 to put it in working position and on the other hand the output pressure signal is fed to and from the controller 50 via the pressure sensor 41. At this time, the controller 50 controls the first positive flow control valve 110 to make the first working pump 11 in a large displacement working state, and at the same time, the controller 50 controls the second bypass cut-off valve 221 to make the right valve block 22 in a bypass cut-off state, and at this time, the right valve block 22 is not operated, and the first working pump 11 supplies oil only to the crushing actuator 60. In addition, the controller 50 also simultaneously controls the second working pump 12 to be in a minimum displacement working state, hydraulic oil discharged by the second working pump 12 is divided into two paths, one path supplies oil to the crushing executing member 60, the other path supplies oil to the left valve block 21, and when the left valve block 21 does not act, the left valve block 21 is in a bypass state, and the hydraulic oil is completely returned to the oil tank, so that the first working pump 11 is used for independently supplying oil to the crushing executing member 60, and the single-pump high-efficiency crushing is realized. In yet another embodiment, the excavator is in a single pump fed crushing mode, for example only the second working pump 12 feeds oil to the crushing actuator 60, in particular the operator controls the pilot control valve 40 such that the output pressure of the pilot control valve 40 acts on the one hand on the crushing valve bank 30 to put it in working position and on the other hand the output pressure signal is fed to and from the controller 50 via the pressure sensor 41. At this time, the controller 50 controls the second positive flow control valve 120 to make the second working pump 12 in a large displacement working state, and at the same time, the controller 50 controls the first bypass shutoff valve 211 to make the left valve block 21 in a bypass shutoff state, at this time, the left valve block 21 is not operated, and the second working pump 12 supplies oil only to the crushing actuator 60. In addition, the controller 50 also simultaneously controls the first working pump 11 to be in a minimum displacement working state, hydraulic oil discharged by the first working pump 11 is divided into two paths, one path is used for supplying oil to the crushing executing piece 60, the other path is used for supplying oil to the right valve block 22, when the right valve block 22 does not act, the right valve block 22 is in a bypass state, and the hydraulic oil is completely returned to the oil tank, so that the second working pump 12 is used for independently supplying oil to the crushing executing piece 60, and further, single-pump high-efficiency crushing is realized.

In yet another embodiment, the excavator is in a crushing mode with dual pump oil supply, the operator controls the pilot control valve 40, and the output pressure of the pilot control valve 40 acts on the one hand on the crushing valve group 30 to put it in the working position, and on the other hand the output pressure signal is input to the controller 50 via the pressure sensor 41. At this time, the controller 50 controls the first and second positive flow control valves 110 and 120 so that the first and second working pumps 11 and 12 are both in a large displacement working state, and the controller 50 simultaneously controls the first and second bypass cut-off valves 211 and 221 so that the left and right valve blocks 21 and 22 are both in a bypass cut-off state, thereby realizing double-pump oil supply of the first and second working pumps 11 and 12 to the crushing actuator 60 in a confluence manner to drive the crushing actuator 60 having a larger specification and a stronger crushing capacity.

It is worth noting that: in any of the above crushing modes, since the left valve block 21 and the right valve block 22 are respectively connected in parallel with the crushing executing member 60, when the excavator executes crushing work, if the whole excavator needs to do other work, corresponding pressure can be established at any time according to actual needs to execute other actions except crushing, so that the crushing and other actions are synchronously performed.

According to the external-valve confluence hydraulic system for crushing, when crushing work is carried out, the crushing valve group is in a working position, and the opening and closing of the positive flow control valve and the on-off state of the valve block are controlled, so that at least one working pump can supply oil to the outside of the crushing executive component valve, and the oil supply switching of the external confluence of the single pump or the double pump valve is realized, so that the crushing work efficiency is ensured, the oil supply requirements of crushing executive components with different specifications are met, and compared with the external confluence scheme of the single pump valve, the pressure loss is further reduced, and the energy loss is reduced; in addition, the controller can switch the external flow scheme of the single pump and the double pump valve and accurately control the flow, so that the controllability is better.

According to the second aspect of the utility model, the excavator provided with the valve external confluence hydraulic system for crushing can realize single-pump or double-pump valve external confluence, so that the pressure loss is reduced, the oil supply requirements of crushing execution pieces of different specifications are met, the crushing operation efficiency is improved, the high temperature of the hydraulic system caused by a large amount of heat is avoided, the performance of the excavator is effectively exerted, and the service life of the excavator is prolonged.

Finally, it should be noted that: the above examples are only specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model, but it should be understood by those skilled in the art that the present utility model is not limited thereto, and that the present utility model is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. The valve outer confluence hydraulic system for crushing is characterized by comprising a crushing valve group, a positive flow control valve group, a hydraulic main pump module, a multi-way valve group and a crushing executing piece;

the crushing valve group is independent of the outside of the multi-way valve group and is communicated with the crushing executive component;

the hydraulic main pump module is respectively communicated with the crushing valve group and the multi-way valve group, and comprises a plurality of working pumps which can supply oil for the multi-way valve group;

the multi-way valve group comprises a plurality of valve blocks, the valve blocks are arranged in one-to-one correspondence with the working pumps, and the valve blocks are communicated with the crushing valve group in a parallel connection mode;

the positive flow control valve group comprises a plurality of positive flow control valves, and the positive flow control valves are arranged at the oil circuit output ends of the working pumps and are arranged in one-to-one correspondence with the working pumps so as to control whether the corresponding working pumps work or not;

when the crushing work is executed, the crushing valve group is in a working position, and at least one working pump can supply oil to the crushing executing piece by controlling the opening and closing of the positive flow control valve and the on-off state of the valve block.

2. The valve external flow hydraulic system for fracturing of claim 1, wherein a bypass shut-off valve is disposed within said valve block;

when the working pump supplies oil to the crushing executing piece, the positive flow control valve corresponding to the working pump is opened, and the valve block is controlled to be in a bypass cut-off state by the bypass cut-off valve except the rest corresponding to the working pump.

3. The valve outer-confluence hydraulic system for crushing according to claim 1, further comprising a pilot control valve in communication with the crushing valve group, the pilot control valve being for controlling whether the crushing valve group is operated.

4. The valve outer-confluence hydraulic system for crushing according to claim 3, wherein the valve outer-confluence hydraulic system for crushing further comprises a controller;

the positive flow control valve group, the multi-way valve group and the pilot control valve are respectively connected with the controller.

5. The valve outer-confluence hydraulic system for crushing according to claim 4, further comprising a pressure sensor connected to the pilot control valve;

the output pressure of the pilot control valve can act on the crushing valve group to enable the crushing valve group to be in a working position, and the pressure sensor is used for collecting the output pressure of the pilot control valve and inputting a signal of the output pressure into the controller.

6. The valve external flow hydraulic system for crushing according to claim 1, wherein the crushing valve group includes a spool and a check valve provided at an inlet end of the spool, the check valve being provided in one-to-one correspondence with the working pump.

7. The valve external flow hydraulic system for fracturing of claim 6 wherein said fracturing valve set further comprises an overload makeup valve disposed at an outlet end of said spool valve.

8. The valve external flow hydraulic system for fracturing of claim 1, wherein said working pump, said positive flow control valve, and said valve block are each provided in two;

the multi-way valve group comprises a left valve block and a right valve block; the hydraulic main pump module comprises a first working pump and a second working pump, and the positive flow control valve group comprises a first positive flow control valve and a second positive flow control valve;

the first working pump, the first positive flow control valve and the left valve block are communicated; the second working pump, the second positive flow control valve and the right valve block are communicated;

the first working pump and the second working pump may be individually or jointly configured to supply oil to the crushing actuator.

9. The out-of-valve hydraulic system for breaking according to claim 1, wherein the breaking actuator is a hydraulic breaking hammer.

10. An excavator comprising the valved external flow hydraulic system for fracturing according to any one of claims 1 to 9.