CN114542540A

CN114542540A - Flow regeneration hydraulic system and engineering machinery

Info

Publication number: CN114542540A
Application number: CN202210054776.6A
Authority: CN
Inventors: 周启迪; 赵永霞; 郭堃; 刘象宝
Original assignee: Changde Zhonglian Zhongke Hydraulic Co ltd
Current assignee: Changde Zhonglian Zhongke Hydraulic Co ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-05-27

Abstract

The invention belongs to the field of engineering machinery and discloses a flow regeneration hydraulic system and engineering machinery, wherein the flow regeneration hydraulic system comprises a boom cylinder hydraulic circuit, a boom main valve (1) and a cylinder oil supply path (P1), wherein the boom cylinder hydraulic circuit comprises a boom main valve (1) and a cylinder oil supply path (P1), the boom main valve (1) is used for controlling the boom cylinder (100) to stretch and retract; a parallel oil supply path (P2) for supplying oil to the plurality of actuator hydraulic circuits in parallel; and a flow rate regeneration valve (2) provided in a flow rate regeneration oil path between a rodless chamber (A1) connected to the boom cylinder (100) and the parallel oil supply path (P2). The invention can recycle the return oil of the rodless cavity of the retraction stroke of the piston of the movable arm oil cylinder, and the return oil is led into other hydraulic actuating mechanisms which normally work through the flow regeneration valve group, thereby realizing the flow recycling and achieving the purpose of energy saving.

Description

Flow regeneration hydraulic system and engineering machinery

Technical Field

The invention belongs to the field of engineering machinery, and particularly relates to engineering machinery and a flow regeneration hydraulic system thereof.

Background

In engineering machinery such as a hydraulic excavator, when a working arm support descends, due to self weight, the descending speed of a lifting oil cylinder is high, and the pressure of a rodless cavity of the oil cylinder is high, so that the energy loss is large. In order to reduce energy loss and save energy, the oil in the rodless cavity of the boom cylinder is generally recycled by a regeneration device, so as to realize flow regeneration.

However, in the prior art, the return oil of the rodless cavity of the boom cylinder is generally introduced into the rod cavity through the flow regeneration valve, and is only used as the supplementary oil of the rod cavity, and the energy recovery is not really realized. Or when the movable arm descends and the arm stretches out, the flow regeneration valve is used for introducing oil in the rodless cavity of the movable arm oil cylinder into the rod cavity of the arm oil cylinder, so that the regeneration flow application range is small, and the utilization rate is low.

Disclosure of Invention

Aiming at the defects or shortcomings in the prior art, the invention provides a flow regeneration hydraulic system and engineering machinery, which can realize low-cost and high-efficiency flow regeneration, expand the application range of regeneration flow, save energy and reduce emission.

To achieve the above object, the present invention provides a flow regenerative hydraulic system including:

the hydraulic circuit of the movable arm oil cylinder comprises a movable arm main valve for controlling the expansion of the movable arm oil cylinder and an oil cylinder oil supply circuit connected with the movable arm main valve;

the parallel oil supply oil circuit supplies oil for the hydraulic circuits of the plurality of actuating mechanisms in parallel;

and the flow regeneration valve is arranged in a flow regeneration oil path between the rodless cavity connected to the movable arm oil cylinder and the parallel oil supply oil path.

In some embodiments, the flow regeneration valve comprises a two-position two-way on-off directional valve and is switchable to a flow conducting position under control of the regeneration control terminal.

In some embodiments, the flow regeneration valve further comprises:

and the flow regeneration one-way valve is arranged in the flow regeneration valve and is positioned in the valve internal communication oil way under the flow conduction position.

In some embodiments, the flow regeneration valve further comprises:

and the flow regeneration one-way valve is connected with the two-position two-way switch reversing valve in series and is arranged in the flow regeneration oil way, and the flow regeneration one-way valve is closer to the parallel oil supply oil way.

In some embodiments, the flow regenerative hydraulic system further comprises:

and the movable arm auxiliary valve is arranged in an auxiliary oil supply oil path connected between the parallel oil supply oil path and the rodless cavity of the movable arm oil cylinder.

In some embodiments, the flow regenerative hydraulic system further comprises:

a series main valve oil path, one end of which is connected with the parallel oil supply oil path, wherein the movable arm auxiliary valve and the respective actuator main valves of the plurality of actuator hydraulic circuits are sequentially arranged in series in the series main valve oil path;

the movable arm auxiliary valve is a two-position four-way reversing valve and is switched between a first valve position and a second valve position under the control of an auxiliary valve control end, the auxiliary oil supply oil way is communicated and the series main valve oil way is closed at the first valve position, and the auxiliary oil supply oil way is closed and the series main valve oil way is communicated at the second valve position.

In some embodiments, the boom main valve comprises:

the first main valve control end is used for controlling and switching to a first switching position for driving a piston rod of the movable arm oil cylinder to retract;

the control end of the second main valve is used for controlling and switching to a second switching position which drives a piston rod of the movable arm oil cylinder to extend out;

and in the first switching position, an orifice is arranged in an oil return path in the movable arm main valve.

In some embodiments, the boom main valve, the flow regeneration valve, and the boom sub-valve comprise an integrated valve stack comprising:

the valve comprises a first valve rod and a second valve rod, wherein the first valve rod and the second valve rod are arranged in the valve at intervals along a first direction and can respectively move along a valve core in a second direction perpendicular to the first direction;

the end part of the valve body close to the second valve rod is provided with an oil cylinder oil supply valve port connected with the oil cylinder oil supply way, and a rodless cavity connecting valve port and a rod cavity connecting valve port which are positioned at two sides of the oil cylinder oil supply port; in the second direction, two ends of the first valve rod are the regeneration control end and the auxiliary valve control end respectively, and two ends of the second valve rod are the first main valve control end and the second main valve control end respectively; and

a flow regeneration check valve;

under the control action of the first main valve control end and the regeneration control end, the oil supply valve port of the oil cylinder is communicated with the rod cavity connecting valve port, the rodless cavity connecting valve port is communicated with the first end of the valve rod inner flow passage, and the regenerated oil flowing out of the second end of the valve rod inner flow passage can open the flow regeneration one-way valve and flow to the parallel oil supply valve port.

In some embodiments, the flow regeneration check valve is disposed within the valve body in the second direction and is positioned at the second end of the flow passage in the valve stem in alignment; or, the flow regeneration check valve is arranged in the valve body along the first direction and is connected to a connecting oil path between the second end of the flow passage in the valve rod and the parallel oil supply valve port.

In addition, the invention also provides engineering machinery which comprises the flow regeneration hydraulic system.

In the flow regeneration hydraulic system, besides the oil supply oil path of the oil cylinder which is used for supplying oil to the movable arm oil cylinder, a parallel oil supply path which is used for supplying oil to a plurality of actuating mechanism hydraulic circuits in parallel is also arranged, and the flow regeneration valve is arranged between the rodless cavity of the movable arm oil cylinder and the parallel oil supply path, so that oil in the rodless cavity of the movable arm oil cylinder can be introduced into the parallel working oil path through the flow regeneration valve when the movable arm descends, and can be used by other actuating mechanisms on the parallel oil path, thereby realizing flow regeneration, expanding the application range of flow, saving more energy and reducing emission and improving the use efficiency through further reasonable distribution of flow.

Further advantages of the present invention, as well as technical effects of preferred embodiments, are further described in the following detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a hydraulic schematic of a flow regenerative hydraulic system according to one embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an integrated valve block of a flow regeneration valve used in the flow regeneration hydraulic system of FIG. 1;

FIG. 3 is a schematic diagram of the integrated valve assembly of FIG. 2 in a flow regeneration mode, wherein the direction of the arrows indicates the direction of the hydraulic oil flow;

FIG. 4 is a hydraulic schematic of a flow regenerative hydraulic system according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of an integrated valve block of a flow regeneration valve used in the flow regeneration hydraulic system of fig. 4, wherein the direction of an arrow indicates the flow direction of hydraulic oil in a flow regeneration state.

Description of the reference numerals

100 boom cylinder 200 first actuator main valve

300 second actuator main valve 400 integrated valve group

1 boom main valve 2 flow regeneration valve

3 movable arm auxiliary valve 4 valve body

5-flow regeneration one-way valve 6 orifice

7 first valve stem 8 second valve stem

71 inner flow passage of valve rod

P1 oil cylinder oil supply path P2 parallel oil supply path

P3 series main valve oil circuit T' oil return valve port

A1 rodless lumen B1 lumen with rod

A1 'rodless chamber connection valve port B1' rod chamber connection valve port

P1 'cylinder oil supply valve port P2' parallel oil supply valve port

Pa1 first main valve control end Pa2 regeneration control end

Pb1 second Main valve control end Pb2 auxiliary valve control end

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation. In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to achieve low cost and more fully utilize the flow regeneration oil, the invention provides a novel flow regeneration hydraulic system. In the embodiment shown in fig. 1 to 3, the flow regenerative hydraulic system includes:

a boom cylinder hydraulic circuit including a boom main valve 1 controlling the boom cylinder 100 to extend and retract and a cylinder oil supply path P1 connected to the boom main valve 1;

a parallel oil supply path P2 for supplying oil to the plurality of actuator hydraulic circuits in parallel;

the flow rate regeneration valve 2 is provided in a flow rate regeneration oil passage between the rodless chamber a1 connected to the boom cylinder 100 and the parallel oil supply passage P2.

Compared with the prior art that the regenerated oil is only used as the supplementary oil of the rod cavity, or only the rod cavity of the bucket rod oil cylinder is introduced, or a plurality of working oil paths are introduced through a more complex valve group system, the invention realizes the flow regeneration with lower cost, simplicity, reliability and more full utilization through the optimized oil path design and the valve group design.

Specifically, the parallel oil supply passage P2 is introduced to introduce the rodless chamber return oil when the boom cylinder is lowered into the parallel oil supply passage P2, so that the hydraulic oil can be used as hydraulic oil for other actuators such as a swing actuator and an arm actuator. As shown in fig. 1, the cylinder oil supply path P1 supplies oil exclusively to the boom cylinder 100, the boom main valve 1 is provided in the cylinder oil supply path P1, and the parallel oil supply path P2 supplies oil in parallel to a plurality of actuator hydraulic circuits and hydraulically drives, for example, the first and second actuators together, that is, the first and second actuator

main valves

200 and 300 shown in fig. 1 are connected in parallel to the parallel oil supply path P2, respectively.

On this basis, the flow rate regeneration oil path provided with the flow rate regeneration valve 2 is connected between the rodless chamber a1 of the boom cylinder 100 and the parallel oil supply path P2, so that when the piston rod of the boom cylinder 100 descends, the return oil of the rodless chamber a1 can be introduced into the parallel oil supply path P2 through the flow rate regeneration oil path, and further can be reasonably distributed and used in a plurality of execution mechanisms, thereby expanding the use range and the use efficiency of the flow rate regeneration oil.

Further, the flow regenerative hydraulic system may further include a boom sub valve 3, and the boom sub valve 3 is disposed in an auxiliary oil supply path connected between the parallel oil supply path P2 and the rodless chamber a1 of the boom cylinder 100. In this way, when the piston rod of the boom cylinder 100 is raised, since the load is large, the pressure oil in the parallel oil supply path P2 is also introduced into the rodless chamber a1 through the auxiliary oil supply path in addition to the oil supply of the cylinder oil supply path P1 to enhance the ejection power of the cylinder. When the method is specifically applied, the boom main valve 1 and the boom auxiliary valve 3 are combined, the extension speed of a piston rod of the boom cylinder 100 can be controlled in a feedback control mode, and the purpose of optimizing energy conservation is achieved.

Wherein, the flow regeneration oil path provided with the flow regeneration valve 2 and the auxiliary oil supply oil path provided with the movable arm auxiliary valve 3 are parallel oil paths, and are connected between the rodless cavity A1 and the parallel oil supply oil path P2. The flow regeneration valve 2 and the boom auxiliary valve 3 are controllable switching valves, such as electromagnetic switching valves. However, in the present embodiment, the flow regeneration valve 2 and the boom pilot valve 3 are both in the form of pilot operated directional control valves for the convenience of uniform control, and more specifically, the flow regeneration valve 2 and the boom pilot valve 3 in fig. 1 are both simple two-position directional control valves.

Specifically to the flow regeneration valve 2, a simple two-position, two-way on-off directional valve is employed in FIG. 1 and has a regeneration control terminal Pa 2. The on-off reversing valve is a normally closed valve and is normally at the right position, and only when the regeneration control end Pa2 is filled with pressure control oil, the flow regeneration valve 2 can be switched to the left position shown in the figure, namely, switched to the flow conducting position under the control of the regeneration control end Pa 2.

Further, the flow rate regeneration valve 2 may further include a flow rate regeneration check valve 5, and the flow rate regeneration check valve 5 may function to prevent the pressure oil from flowing from the parallel oil supply passage P2 to the rodless chamber a1 through the flow rate regeneration oil passage to the rodless chamber a1 because the pressure oil in the parallel oil supply passage P2 cannot flow into the parallel oil supply passage P2 but cannot flow back to the rodless chamber a1 to block the lowering of the piston rod if the oil pressure of the returning oil of the rodless chamber a1 is insufficient when the piston rod of the boom cylinder 100 is lowered to communicate with the flow rate regeneration oil passage through the regeneration control port Pa 2.

It should be noted that the return oil in the rodless chamber a1 is used as the regeneration oil, and after the return oil overcomes the back pressure of the flow regeneration check valve 5, the remaining pressure is at least greater than the pressure oil in the parallel oil supply passage P2, so that the return oil is available.

In fig. 1, the flow regeneration check valve 5 is provided in the valve communication oil passage in the flow regeneration valve 2 at the flow communication position. Namely, the flow regeneration one-way valve 5 is integrated with a two-position two-way switch reversing valve. However, in another embodiment, as shown in fig. 4, the flow regeneration check valve 5 may be provided outside the flow regeneration valve 2, that is, the flow regeneration check valve 5 is provided in the flow regeneration oil passage in series with the two-position two-way on-off switching valve, and the flow regeneration check valve 5 is provided closer to the parallel oil supply passage P2.

Specifically, the boom pilot valve 3 is a two-position four-way selector valve and is switched between a first valve position and a second valve position under the control of a pilot valve control terminal Pb2 in fig. 1 and 4. Unlike the two-position two-way on-off directional valve of the flow regeneration valve 2, the boom sub-valve 3 is a two-position four-way on-off directional valve, the flow regeneration hydraulic system further includes a series main valve oil path P3, one end of the series main valve oil path P3 is connected to the parallel oil supply path P2, and the boom sub-valve 3 and the respective actuator main valves of the plurality of actuator hydraulic circuits are sequentially arranged in series in the series main valve oil path P3. Therefore, the boom pilot valve 3 is an on-off valve for the pilot oil supply passage and an on-off valve for the series main valve oil passage P3.

Specifically, when the pilot valve control end Pb2 introduces pressure control oil, the valve position is switched to the first valve position, i.e., the left position in the drawing, the pilot oil supply passage is opened and the series main valve oil passage P3 is closed, and when the pilot valve control end Pb2 does not introduce pressure control oil, the valve position is switched to the second valve position, i.e., the right position in the drawing, the pilot oil supply passage is closed and the series main valve oil passage P3 is opened. In this way, when the boom pilot valve 3 is switched to the second valve position, the series main valve oil passage P3 is opened, and when both the first actuator main valve 200 and the second actuator main valve 300 are at the neutral position, the series main valve oil passage P3 is completely opened, and the partial pressure oil of the parallel oil supply passage P2 can be led out through the series main valve oil passage P3 as a pilot control oil passage or the like for many other purposes. However, the specific use, connection, and the like of the tandem main valve oil passage P3 are not critical to the present application, and therefore, will not be described in detail.

Specifically, the boom main valve 1, in fig. 1 and 4, the boom main valve 1 includes:

a first main valve control end Pa1 for controlling switching to a first switching position that drives the piston rod of the boom cylinder 100 to retract;

a second main valve control end Pb1 for controlling switching to a second switching position that drives the piston rod of the boom cylinder 100 to extend;

in the first switching position, an orifice 6 is provided in the in-valve return oil path of the boom main valve 1.

Thus, when the pressure control oil is supplied to the first main valve control end Pa1, and the boom main valve 1 is switched to the first switching position (i.e., the right position shown in fig. 1 and 4), the cylinder oil supply passage P1 pumps the hydraulic oil to the rod chamber B1, and lowers the piston rod of the boom cylinder 100. At this time, one of the return oil from the rodless chamber a1 returns through the boom main valve 1, and the other returns through the flow rate regeneration oil passage to the parallel oil supply passage P2. When returning oil through the boom main valve 1, the amount of return oil passing through the boom main valve 1 is extremely small due to the throttling action of the orifice 6 in the boom main valve 1, and most of the oil can flow as a regenerative flow to the parallel oil supply passage P2.

It should be noted that the selection of the throttle hole 6 or another throttle element, the setting of the throttle parameters thereof, and the like may be specifically set as needed. Furthermore, the throttle hole 6 or other throttle elements can be set to be adjustable in throttle valve port, so that the flow of the regenerated oil can be adjusted through adjusting the opening of the throttle valve port, or the recovery speed of the piston rod of the movable arm can be adjusted, and the aim of optimizing energy conservation is fulfilled.

In addition, the parallel oil supply path P2 and the cylinder oil supply path P1 may pump oil by a single hydraulic pump, or may be respectively provided with separate independent hydraulic pumps, which is not particularly limited in the present invention.

It can be seen that in the flow regeneration hydraulic system according to the present invention, when, for example, the boom of an excavator descends, the oil in the rodless chamber of the boom cylinder may enter the parallel oil supply path P2 through the flow regeneration valve 2, and if the oil pressure in the rodless chamber a1 is lower than the working pressure in the parallel oil supply path P2, the oil returns to the tank; if the oil pressure of the rodless cavity A1 is higher than the pressure of the parallel oil supply oil path P2 or the pressure of an actuating mechanism, the oil is distributed to the actuating mechanism (such as a rotary mechanism and a bucket rod) according to the situation for use, flow regeneration is realized, the application range of the regeneration flow is expanded, energy conservation and emission reduction are realized, and the efficiency is improved.

On the basis of the hydraulic principle, the boom main valve 1, the flow regeneration valve 2 and the boom auxiliary valve 3 all adopt simple valves, the cost is low, and the integrated valve group 400 can be further formed by combination, so that the hydraulic boom hydraulic control system is simple and modularized, is convenient to manufacture, install and use, and has lower cost. As an example, referring to fig. 2, 3, integrated valve stack 400 may include:

a first valve rod 7 and a second valve rod 8 which are arranged in the valve at intervals along a first direction (namely, vertical direction of the paper of fig. 2) and can respectively move along a valve core along a second direction (namely, transverse direction of the paper of fig. 2) vertical to the first direction, wherein the first valve rod 7 is provided with a valve rod inner flow passage 71;

a valve body 4, in the first direction, the end of the valve body 4 close to the first valve rod 7 is provided with a parallel oil supply valve port P2 ' and an oil return valve port T ' which are connected with a parallel oil supply path P2, and the end of the valve body 4 close to the second valve rod 8 is provided with an oil cylinder oil supply valve port P1 ' connected with an oil cylinder oil supply path P1, a rodless cavity connecting valve port a1 ' and a rod cavity connecting valve port B1 ' which are positioned at two sides of the oil cylinder oil supply port; in the second direction, the two ends of the first valve rod 7 are respectively a regeneration control end Pa2 and an auxiliary valve control end Pb2, and the two ends of the second valve rod 8 are respectively a first main valve control end Pa1 and a second main valve control end Pb 1; and a flow regeneration check valve 5.

In the integrated valve set 400 with this structure, referring to fig. 3, when pilot-controlled pressure oil is introduced into the first main valve control end Pa1 and the regeneration control end Pa2, the first valve rod 7 moves to the left, the second valve rod 8 moves to the right, so that the right movement of the second valve rod 8 enables the cylinder oil supply valve port P1 'to communicate with the rod chamber connecting valve port B1', the left movement of the first valve rod 7 enables the rodless chamber connecting valve port a1 'to communicate with the first end of the valve rod internal flow passage 71, and the regeneration oil flowing out of the second end of the valve rod internal flow passage 71 can open the flow regeneration check valve 5 and flow to the parallel oil supply valve port P2', so as to realize flow regeneration. The flow regeneration path can be seen from the arrow in fig. 3.

It should be noted that, while the return oil at the rodless chamber connection port a1 ' is communicated with the first end of the valve-stem inner flow passage 71 and also communicated with the orifice (not shown), and further led to the return oil port T ', most of the return oil flows to the parallel oil supply port P2 ', that is, the parallel oil supply passage P2, and the amount of oil flowing back to the oil tank is extremely small due to the throttling effect when the pressure of the return oil is sufficiently high.

Corresponding to the flow regeneration valve 2 shown in the hydraulic schematic diagram of fig. 1, the flow regeneration check valve 5 in fig. 2 and 3 is arranged in the second direction in the valve body 4 and is provided in alignment with the second end of the stem internal flow passage 71, that is, in the valve of the flow regeneration valve 2, specifically, the flow regeneration check valve 5 is provided in the first stem 7 having the stem internal flow passage 71.

Corresponding to the flow regeneration valve 2 shown in the hydraulic schematic of fig. 4, the flow regeneration check valve 5 in fig. 5 is arranged in the valve body 4 in the first direction and connected to the connection oil path between the second end of the stem internal flow passage 71 and the parallel oil supply port P2', i.e., arranged outside the valve of the flow regeneration valve 2.

The integrated valve bank 400 and the flow regeneration hydraulic system can be applied to engineering machinery with a large movable arm, such as a hydraulic excavator, an aerial work machine and the like, so that the movable arm flow regeneration is realized at low cost and high efficiency, and the energy conservation and emission reduction are realized. The flow regeneration check valve 5 introduces the oil returned when the boom cylinder is lowered into the parallel oil supply passage P2, and can be used as hydraulic oil for other actuators such as a swing mechanism and an arm.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A flow regenerative hydraulic system, comprising:

the hydraulic circuit of the boom cylinder comprises a boom main valve (1) for controlling the boom cylinder (100) to stretch and retract and a cylinder oil supply path (P1) connected with the boom main valve (1);

a parallel oil supply path (P2) for supplying oil to the plurality of actuator hydraulic circuits in parallel; and

and a flow rate regeneration valve (2) provided in a flow rate regeneration oil path between the rodless chamber (A1) connected to the boom cylinder (100) and the parallel oil supply path (P2).

2. Flow regenerating hydraulic system according to claim 1, characterized in that the flow regenerating valve (2) comprises a two-position two-way on-off directional valve and can be switched to the flow conducting position under the control of the regeneration control terminal (Pa 2).

3. A flow regenerative hydraulic system according to claim 2, characterized in that the flow regenerative valve (2) further comprises:

and the flow regeneration one-way valve (5) is arranged in the flow regeneration valve (2) and is positioned in the valve internal communication oil way under the flow conduction position.

4. A flow regenerative hydraulic system according to claim 2, characterized in that the flow regenerative valve (2) further comprises:

and the flow regeneration one-way valve (5) is connected with the two-position two-way switch reversing valve in series in the flow regeneration oil way, and the flow regeneration one-way valve (5) is closer to the parallel oil supply oil way (P2).

5. The flow regenerative hydraulic system of claim 2, further comprising:

and a boom sub-valve (3) provided in a sub-oil supply passage connected between the parallel oil supply passage (P2) and a rodless chamber (A1) of the boom cylinder (100).

6. The flow regenerative hydraulic system of claim 5, further comprising:

a series main valve oil passage (P3) having one end connected to the parallel oil supply passage (P2), the boom pilot valve (3) and the actuator main valves of the actuator hydraulic circuits being sequentially arranged in series in the series main valve oil passage (P3);

the movable arm auxiliary valve (3) is a two-position four-way reversing valve and is switched between a first valve position and a second valve position under the control of an auxiliary valve control end (Pb2), the auxiliary oil supply oil path is communicated and the series main valve oil path (P3) is cut off at the first valve position, and the auxiliary oil supply oil path is cut off and the series main valve oil path (P3) is communicated at the second valve position.

7. The flow regenerative hydraulic system according to claim 6, characterized in that the boom main valve (1) comprises:

a first main valve control end (Pa1) for controlling switching to a first switching position that drives a piston rod of the boom cylinder (100) to retract;

a second main valve control end (Pb1) for controlling switching to a second switching position that drives a piston rod of the boom cylinder (100) to extend;

and in the first switching position, an orifice (6) is arranged in an oil return path in the main valve (1) of the movable arm.

8. Flow regenerative hydraulic system according to claim 7, characterized in that the boom main valve (1), the flow regenerative valve (2) and the boom auxiliary valve (3) constitute an integrated valve group (400), the integrated valve group (400) comprising:

the valve comprises a first valve rod (7) and a second valve rod (8), wherein the first valve rod (7) and the second valve rod (8) are arranged in the valve at intervals along a first direction and can respectively move along a second direction perpendicular to the first direction, and the first valve rod (7) is provided with a valve rod inner flow passage (71);

a valve body (4), in the first direction, a parallel oil supply valve port (P2 ') and an oil return valve port (T ') connected with the parallel oil supply path (P2) are arranged at the end part of the valve body (4) close to the first valve rod (7), and a cylinder oil supply valve port (P1 ') connected with the cylinder oil supply path (P1), a rodless cavity connecting valve port (a1 ') and a rod cavity connecting valve port (B1 ') are arranged at the end part of the valve body (4) close to the second valve rod (8); in the second direction, two ends of the first valve rod (7) are the regeneration control end (Pa2) and the auxiliary valve control end (Pb2), respectively, and two ends of the second valve rod (8) are the first main valve control end (Pa1) and the second main valve control end (Pb1), respectively; and

a flow regeneration check valve (5);

under the control action of the first main valve control end (Pa1) and the regeneration control end (Pa2), the oil cylinder oil supply valve port (P1 ') is communicated with the rod cavity connecting valve port (B1'), the rodless cavity connecting valve port (A1 ') is communicated with the first end of the valve rod inner flow passage (71), and the regeneration oil liquid flowing out of the second end of the valve rod inner flow passage (71) can open the flow regeneration check valve (5) and flow to the parallel oil supply valve port (P2').

9. Flow regenerating hydraulic system according to claim 8, characterized in that the flow regenerating non return valve (5) is arranged in the valve body (4) in the second direction and positioned in register at the second end of the valve stem internal flow channel (71);

or the flow regeneration check valve (5) is arranged in the valve body (4) along the first direction and connected to a connecting oil path between the second end of the valve rod inner flow passage (71) and the parallel oil supply valve port (P2').

10. A working machine, characterized in that the working machine comprises a flow regenerative hydraulic system according to any one of claims 1-9.