Flow regeneration hydraulic system and construction machinery

Abstract

The present invention belongs to the field of construction machinery, and discloses a flow regeneration hydraulic system and a construction machinery. The flow regeneration hydraulic system includes a boom cylinder hydraulic circuit, which includes a boom main valve (1) for controlling the telescopic movement of a boom cylinder (100) and an oil supply oil path (P1) connected to the boom main valve (1); a parallel oil supply oil path (P2) for supplying oil in parallel to a plurality of actuator hydraulic circuits; and a flow regeneration valve (2) provided in a flow regeneration oil path connected between the rodless cavity (A1) of the boom cylinder (100) and the parallel oil supply oil path (P2). The present invention can reuse the oil returned from the rodless cavity during the piston retraction stroke of the boom cylinder, and introduce it into other normally operating hydraulic actuators through a flow regeneration valve group, so as to achieve flow reuse and the purpose of energy conservation.

Description

Technical Field

[0001] The present invention belongs to the field of construction machinery, and specifically, relates to a construction machinery and a flow regeneration hydraulic system thereof. Background Art

[0002] In construction machinery such as hydraulic excavators, when the working boom descends, due to its own weight, the descending speed of the lifting cylinder is fast, and the pressure in the rodless cavity of the cylinder is relatively high, so the energy loss is large. To reduce the energy loss and achieve energy conservation, usually, the oil in the rodless cavity of the boom cylinder is recycled through a regeneration device to achieve flow regeneration.

[0003] However, in the prior art, generally, the oil returned from the rodless cavity of the boom cylinder is introduced into the rod cavity through a flow regeneration valve and is only used as supplementary oil for the rod cavity, without truly realizing energy recovery. Or, only during the combined operation of the boom descending and the stick extending, the oil in the rodless cavity of the boom cylinder is introduced into the rod cavity of the stick cylinder through a flow regeneration valve for use, and the application range of the regenerated flow is small and the utilization rate is low. Summary of the Invention

[0004] Aiming at the above-mentioned defects or deficiencies of the prior art, the present invention provides a flow regeneration hydraulic system and a construction machinery, which can achieve low-cost and high-efficiency flow regeneration, expand the application range of the regenerated flow, and save energy and reduce emissions.

[0005] To achieve the above object, the present invention provides a flow regeneration hydraulic system, which includes:

[0006] A boom cylinder hydraulic circuit, including a boom main valve for controlling the telescopic movement of the boom cylinder and an oil supply circuit for the cylinder connected to the boom main valve;

[0007] A parallel oil supply circuit for supplying oil in parallel to a plurality of actuator hydraulic circuits;

[0008] A flow regeneration valve disposed in a flow regeneration oil circuit connecting the rodless cavity of the boom cylinder and the parallel oil supply circuit.

[0009] In some embodiments, the flow regeneration valve includes a two-position two-way switching valve and can be switched to a flow conduction position under the control of a regeneration control end.

[0010] In some embodiments, the flow regeneration valve further includes:

[0011] A flow regeneration check valve disposed in the flow regeneration valve and in the valve internal communication oil circuit under the flow conduction position.

[0012] In some embodiments, the flow regeneration valve further includes:

[0013] A flow regeneration one-way valve is arranged in series with the two-position two-way switch reversing valve in the flow regeneration oil circuit, and the flow regeneration one-way valve is arranged closer to the parallel oil supply oil circuit.

[0014] In some embodiments, the flow regeneration hydraulic system further comprises:

[0015] The boom auxiliary valve is arranged in the auxiliary oil supply oil circuit connected between the parallel oil supply oil circuit and the rodless chamber of the boom cylinder.

[0016] In some embodiments, the flow regeneration hydraulic system further comprises:

[0017] A series main valve oil circuit, one end of which is connected to the parallel oil supply oil circuit, wherein the boom auxiliary valve and respective actuator main valves of the plurality of actuator hydraulic circuits are sequentially arranged in series in the series main valve oil circuit;

[0018] Among them, the boom auxiliary valve is a two-position four-way reversing valve and switches between a first valve position and a second valve position under the control of the auxiliary valve control end. In the first valve position, the auxiliary oil supply circuit is connected and the series main valve oil circuit is cut off. In the second valve position, the auxiliary oil supply circuit is cut off and the series main valve oil circuit is connected.

[0019] In some embodiments, the boom main valve comprises:

[0020] A first main valve control end, used for controlling switching to a first switching position for driving the piston rod of the boom cylinder to retract;

[0021] A second main valve control end is used to control switching to a second switching position that drives the piston rod of the boom cylinder to extend;

[0022] Wherein, in the first switching position, a throttling hole is provided in the oil return circuit in the valve of the boom main valve.

[0023] In some embodiments, the boom main valve, the flow regeneration valve and the boom auxiliary valve form an integrated valve group, and the integrated valve group includes:

[0024] A first valve stem and a second valve stem are arranged in the valve at intervals along a first direction and can each move the valve core along a second direction perpendicular to the first direction, and the first valve stem is provided with a valve stem inner flow channel;

[0025] Valve body, in the first direction, at the end of the valve body close to the first valve rod, there are a parallel oil supply valve port and an oil return valve port connected to the parallel oil supply oil circuit, and at the end of the valve body close to the second valve rod, there are an oil cylinder oil supply valve port connected to the oil cylinder oil supply oil circuit, and a rodless chamber connection valve port and a rod chamber connection valve port on both sides of the oil cylinder oil supply port; in the second direction, the two ends of the first valve rod are respectively the regeneration control end and the auxiliary valve control end, and the two ends of the second valve rod are respectively the first main valve control end and the second main valve control end; and

[0026] Flow regeneration check valve;

[0027] Wherein, under the control of the first main valve control end and the regeneration control end, the oil cylinder oil supply valve port is communicated with the rod chamber connection valve port, the rodless chamber connection valve port is communicated with the first end of the inner flow passage of the valve rod, and the regenerated oil flowing out from the second end of the inner flow passage of the valve rod can open the flow regeneration check valve and flow to the parallel oil supply valve port.

[0028] In some embodiments, the flow regeneration check valve is arranged in the valve body in the second direction and is positioned at the second end of the inner flow passage of the valve rod; or, the flow regeneration check valve is arranged in the valve body in the first direction and is connected in the connection oil circuit between the second end of the inner flow passage of the valve rod and the parallel oil supply valve port.

[0029] In addition, the present invention also provides a construction machinery, and the construction machinery includes the above-mentioned flow regeneration hydraulic system.

[0030] In the flow regeneration hydraulic system of the present invention, in addition to the oil cylinder oil supply oil circuit set for the boom cylinder oil supply, there is also a parallel oil supply oil circuit for parallel oil supply to multiple actuator hydraulic circuits. Furthermore, the flow regeneration valve is arranged between the rodless chamber of the boom cylinder and the parallel oil supply oil circuit, so that the oil in the rodless chamber of the boom cylinder when the boom descends can be introduced into the parallel working oil circuit through the flow regeneration valve and can be used by other actuators on the parallel oil circuit, realizing flow regeneration, and also expanding the application range of the flow. Through further reasonable distribution of the flow, it can save more energy and reduce emissions, and improve the use efficiency.

[0031] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 Hydraulic schematic diagram of a flow regeneration hydraulic system according to an embodiment of the present invention;

[0034] Figure 2 is Figure 1 Schematic structural diagram of an integrated valve group of a flow regeneration valve used in the flow regeneration hydraulic system of;

[0035] Figure 3 is Figure 2 Schematic diagram of the state of the integrated valve group of when realizing flow regeneration, where the arrow direction indicates the flow direction of hydraulic oil;

[0036] Figure 4 Hydraulic schematic diagram of a flow regeneration hydraulic system according to another embodiment of the present invention;

[0037] Figure 5 is Figure 4 Schematic structural diagram of an integrated valve group of a flow regeneration valve used in the flow regeneration hydraulic system of, where the arrow direction indicates the flow direction of hydraulic oil in the flow regeneration state.

[0038] Description of reference numerals

[0039] 100 Boom cylinder 200 Main valve of the first actuator

[0040] 300 Main valve of the second actuator 400 Integrated valve group

[0041] 1 Boom main valve 2 Flow regeneration valve

[0042] 3 Boom auxiliary valve 4 Valve body

[0043] 5 Flow regeneration check valve 6 Throttle orifice

[0044] 7 First valve stem 8 Second valve stem

[0045] 71 Inner flow passage of the valve stem

[0046] P1 Oil supply oil passage for the cylinder P2 Parallel oil supply oil passage

[0047] P3 Series main valve oil passage T’ Oil return valve port

[0048] A1 Rodless cavity B1 Rod cavity

[0049] A1’ Rodless cavity connection valve port B1’ Rod cavity connection valve port

[0050] P1’ Oil supply valve port for the cylinder P2’ Parallel oil supply valve port

[0051] Pa1 Control end of the first main valve Pa2 Regeneration control end

[0052] Pb1 Second main valve control terminal, Pb2 Auxiliary valve control terminal Detailed implementation manners

[0053] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention. It should be noted that, without conflict, the implementation manners in the present invention and the features in the implementation manners can be combined with each other.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the implementation manners.

[0055] In order to achieve low cost and make more full use of the flow regenerated oil, the present invention provides a novel flow regeneration hydraulic system. As Figures 1 to 3 shown in the specific implementation manners, the flow regeneration hydraulic system includes:

[0056] The boom cylinder hydraulic circuit includes a boom main valve 1 for controlling the telescopic movement of the boom cylinder 100 and an oil supply circuit P1 for the cylinder connected to the boom main valve 1;

[0057] The parallel oil supply circuit P2 supplies oil in parallel to a plurality of actuator hydraulic circuits;

[0058] The flow regeneration valve 2 is arranged in the flow regeneration oil circuit between the rodless chamber A1 of the boom cylinder 100 and the parallel oil supply circuit P2.

[0059] Compared with the prior art in which the regenerated oil is only used as the supplementary oil for the rod chamber, or only introduced into the rod chamber of the stick cylinder, or introduced into a plurality of working oil circuits through a more complex valve group system, the present invention realizes lower cost, simple and reliable, and more full utilization of flow regeneration through optimized oil circuit design and valve group design.

[0060] Specifically, by introducing the parallel oil supply circuit P2, the oil returned from the rodless chamber when the boom cylinder descends is introduced into the parallel oil supply circuit P2, so that it can be used as the working oil for other actuators such as slewing and stick. As Figure 1 shown, the oil supply circuit P1 for the cylinder is dedicated to supplying oil to the boom cylinder 100, the boom main valve 1 is arranged in the oil supply circuit P1 for the cylinder, the parallel oil supply circuit P2 supplies oil in parallel to a plurality of actuator hydraulic circuits, and jointly hydraulically drives the work of, for example, the first and second actuators, that is Figure 1 shown, the first actuator main valve 200 and the second actuator main valve 300 are respectively connected in parallel to the parallel oil supply circuit P2.

[0061] On this basis, a flow regeneration oil circuit provided with a flow regeneration valve 2 is connected between the rodless chamber A1 of the boom cylinder 100 and the parallel oil supply circuit P2. Thus, when the piston rod of the boom cylinder 100 descends, the oil returning from the rodless chamber A1 can be introduced into the parallel oil supply circuit P2 through the flow regeneration oil circuit, and then can be reasonably distributed and used among multiple actuators, thereby expanding the application range and efficiency of the flow regeneration oil.

[0062] Further, the flow regeneration hydraulic system may further include a boom auxiliary valve 3, which is arranged in an auxiliary oil supply circuit connecting the parallel oil supply circuit P2 and the rodless chamber A1 of the boom cylinder 100. In this way, when the piston rod of the boom cylinder 100 ascends, due to the large load, in addition to the oil supply from the oil cylinder oil supply circuit P1, the pressure oil in the parallel oil supply circuit P2 is also introduced into the rodless chamber A1 through the auxiliary oil supply circuit to enhance the jacking power of the oil cylinder. In specific applications, in combination with the boom main valve 1 and the boom auxiliary valve 3, the extension speed of the piston rod of the boom cylinder 100 can be controlled by a feedback control method to achieve the purpose of optimizing energy conservation.

[0063] Among them, the flow regeneration oil circuit provided with the flow regeneration valve 2 and the auxiliary oil supply circuit provided with the boom auxiliary valve 3 are parallel oil circuits, both of which are connected between the rodless chamber A1 and the parallel oil supply circuit P2. The flow regeneration valve 2 and the boom auxiliary valve 3 are both controllable switch reversing valves, such as electromagnetic switch valves, etc. However, in this embodiment, for the convenience of unified control, the flow regeneration valve 2 and the boom auxiliary valve 3 both adopt the form of hydraulic control reversing valves. More specifically, Figure 1 the flow regeneration valve 2 and the boom auxiliary valve 3 in

[0064] both adopt simple two-position reversing valves. Figure 1 Specifically for the flow regeneration valve 2,

[0065] a simple two-position two-way switch reversing valve is adopted in and has a regeneration control port Pa2. The switch reversing valve is a normally closed valve, generally in the right position, and only when pressure control oil is introduced into the regeneration control port Pa2, the flow regeneration valve 2 can be switched to the left position shown in the figure, that is, it is switched to the flow conduction position under the control of the regeneration control port Pa2.

[0065] In addition, the flow regeneration valve 2 may further include a flow regeneration check valve 5. The function of the flow regeneration check valve 5 is that when the piston rod of the boom cylinder 100 descends and the flow regeneration oil circuit is conducted through the regeneration control port Pa2, if the oil pressure of the oil returning from the rodless chamber A1 is insufficient, it cannot enter the parallel oil supply circuit P2, but it also cannot allow the pressure oil in the parallel oil supply circuit P2 to flow back to the rodless chamber A1 to hinder the descent of the piston rod. Therefore, the flow regeneration check valve 5 is used to prevent the pressure oil from flowing from the parallel oil supply circuit P2 to the rodless chamber A1 through the flow regeneration oil circuit.

[0066] It should be noted that the return oil in the rodless chamber A1 is used as the regeneration oil. After overcoming the back pressure of the flow regeneration check valve 5, the remaining pressure should be at least greater than the pressure oil in the parallel oil supply circuit P2 before it can be used.

[0067] exist Figure 1 In the embodiment, the flow regeneration check valve 5 is arranged in the flow regeneration valve 2 and is located in the valve internal oil path under the flow conduction position. That is, the flow regeneration check valve 5 is integrated with the two-position two-way switch reversing valve. However, in another embodiment, as Figure 4 As shown, the flow regeneration check valve 5 can also be arranged outside the flow regeneration valve 2, that is, the flow regeneration check valve 5 and the two-position two-way switch reversing valve are arranged in series in the flow regeneration oil circuit, and the flow regeneration check valve 5 is arranged closer to the parallel oil supply oil circuit P2.

[0068] Specifically for the boom auxiliary valve 3, Figure 1 , Figure 4 In the figure, the boom auxiliary valve 3 is a two-position four-way reversing valve and switches between the first valve position and the second valve position under the control of the auxiliary valve control terminal Pb2. Unlike the two-position two-way switch reversing valve of the flow regeneration valve 2, the boom auxiliary valve 3 is a two-position four-way switch reversing valve. The flow regeneration hydraulic system also includes a series main valve oil circuit P3, one end of which is connected to the parallel oil supply oil circuit P2. The boom auxiliary valve 3 and the respective actuator main valves of the multiple actuator hydraulic circuits are sequentially arranged in series in the series main valve oil circuit P3. Therefore, the boom auxiliary valve 3 is both a switch valve of the auxiliary oil supply oil circuit and a switch valve of the series main valve oil circuit P3.

[0069] Specifically, when the pressure control oil is introduced into the auxiliary valve control end Pb2, it is switched to the first valve position, i.e., the left position in the figure, at which time the auxiliary oil supply oil circuit is connected and the series main valve oil circuit P3 is cut off. When the pressure control oil is not introduced into the auxiliary valve control end Pb2, it is switched to the second valve position, i.e., the right position in the figure, the auxiliary oil supply oil circuit is cut off and the series main valve oil circuit P3 is connected. In this way, when the boom auxiliary valve 3 is switched to the second valve position, the series main valve oil circuit P3 is connected. If the first actuator main valve 200 and the second actuator main valve 300 shown in the figure are both in the middle position, the series main valve oil circuit P3 is completely connected, and part of the pressure oil of the parallel oil supply oil circuit P2 can be led out through the series main valve oil circuit P3 for many other uses, such as as a pilot control oil circuit. However, it should be noted that the specific use and connection of the series main valve oil circuit P3 are not the key to this application, and therefore will not be described in detail.

[0070] Specifically for the boom main valve 1, Figure 1 , Figure 4 In the embodiment, the boom main valve 1 comprises:

[0071] The first main valve control end Pa1 is used to control switching to a first switching position for driving the piston rod of the boom cylinder 100 to retract;

[0072] The second main valve control end Pb1 is used to control the switching to the second switching position for driving the piston rod of the boom cylinder 100 to extend;

[0073] Wherein, at the first switching position, a throttle orifice 6 is provided in the valve internal oil return oil circuit of the boom main valve 1.

[0074] In this way, when pressure control oil is introduced into the first main valve control end Pa1, the boom main valve 1 is switched to the first switching position (i.e., the right position shown in Figure 1 、 Figure 4 ), the oil supply oil circuit P1 of the cylinder pumps hydraulic oil to the rod chamber B1, driving the piston rod of the boom cylinder 100 to descend. At this time, one way of the oil return of the rodless chamber A1 returns oil through the boom main valve 1, and the other way flows through the flow regeneration oil circuit to the parallel oil supply oil circuit P2. Among them, when returning oil through the boom main valve 1, due to the throttling effect of the throttle orifice 6 in the boom main valve 1, the oil return amount through the boom main valve 1 can be extremely small, and most of the oil can flow to the parallel oil supply oil circuit P2 as the regeneration flow.

[0075] It should be noted that the selection of the throttle orifice 6 or other throttling elements and the setting of their throttling parameters can be specifically set as required. Further, the throttle orifice 6 or other throttling elements can be set to have an adjustable throttle valve port, so that the regeneration oil flow can also be adjusted by adjusting the throttle valve port opening, or the recovery speed of the boom piston rod can be adjusted to achieve the purpose of optimizing energy conservation.

[0076] In addition, the parallel oil supply oil circuit P2 and the oil supply oil circuit P1 of the cylinder can pump oil through a single hydraulic pump, or can be respectively equipped with their own independent hydraulic pumps, and the present invention does not make a special limitation on this.

[0077] It can be seen that in the flow regeneration hydraulic system according to the present invention, when the boom of an excavator descends, for example, the oil in the rodless chamber of the boom cylinder can enter the parallel oil supply oil circuit P2 through the flow regeneration valve 2. If the oil pressure in the rodless chamber A1 is lower than the working pressure in the parallel oil supply oil circuit P2, the oil returns to the oil tank; if the oil pressure in the rodless chamber A1 is higher than the pressure in the parallel oil supply oil circuit P2 or the pressure of a certain actuator, the oil is distributed to the actuator (such as slewing, arm) for use according to the situation, realizing flow regeneration, expanding the application range of the regeneration flow, thereby achieving energy conservation and emission reduction and improving efficiency.

[0078] Based on the above hydraulic principle, the boom main valve 1, the flow regeneration valve 2 and the boom auxiliary valve 3 all adopt simple valve parts, with low cost, and further can be combined to form an integrated valve group 400, which is simple and modular, facilitating manufacturing, installation and use, and with even lower cost. As an example, referring to Figure 2 、 Figure 3 , the integrated valve group 400 may include:

[0079] The first valve stem 7 and the second valve stem 8 are arranged in the valve at intervals along the first direction (i.e., Figure 2 the vertical direction of the paper surface in Figure 2 ), and can each move the spool along the second direction perpendicular to the first direction (i.e.,

[0080] the horizontal direction of the paper surface in ). The first valve stem 7 is provided with an internal flow passage 71 of the valve stem;

[0080] The valve body 4, in the first direction, at the end of the valve body 4 close to the first valve stem 7, is provided with a parallel oil supply valve port P2' connected to the parallel oil supply oil path P2 and an oil return valve port T', and at the end of the valve body 4 close to the second valve stem 8, is provided with an oil cylinder oil supply valve port P1' connected to the oil cylinder oil supply oil path P1 and rodless cavity connection valve ports A1' and rod cavity connection valve ports B1' on both sides of the oil cylinder oil supply port; in the second direction, the two ends of the first valve stem 7 are respectively a regeneration control end Pa2 and an auxiliary valve control end Pb2, and the two ends of the second valve stem 8 are respectively a first main valve control end Pa1 and a second main valve control end Pb1; and a flow regeneration check valve 5.

[0081] In the integrated valve group 400 with this structure, referring to Figure 3 when hydraulic control pressure oil is introduced into the first main valve control end Pa1 and the regeneration control end Pa2, the first valve stem 7 moves leftward and the second valve stem 8 moves rightward. Thus, the rightward movement of the second valve stem 8 causes the oil cylinder oil supply valve port P1' to communicate with the rod cavity connection valve port B1', and the leftward movement of the first valve stem 7 causes the rodless cavity connection valve port A1' to communicate with the first end of the internal flow passage 71 of the valve stem. The regenerated oil flowing out from the second end of the internal flow passage 71 of the valve stem can open the flow regeneration check valve 5 and flow to the parallel oil supply valve port P2', realizing flow regeneration. Among them, the above-mentioned flow regeneration path can be seen from the Figure 3 arrows shown.

[0082] It should be noted that when the oil return of the rodless cavity connection valve port A1' communicates with the first end of the internal flow passage 71 of the valve stem, it also communicates with a throttle orifice (not shown), and then leads to the oil return valve port T'. However, due to the throttling effect, when the pressure of the oil return oil is high enough, most of it flows to the parallel oil supply valve port P2', that is, flows to the parallel oil supply oil path P2, and the amount of oil flowing back to the oil tank is extremely small.

[0083] Corresponding to the Figure 1 flow regeneration valve 2 shown in the hydraulic schematic diagram of Figure 2 、 Figure 3 the flow regeneration check valve 5 in

[0084] is arranged in the valve body 4 along the second direction and is arranged opposite to the second end of the internal flow passage 71 of the valve stem, that is, is arranged inside the flow regeneration valve 2. Specifically, the flow regeneration check valve 5 is arranged in the first valve stem 7 with the internal flow passage 71 of the valve stem.

[0084] Corresponding to the Figure 4 flow regeneration valve 2 shown in the hydraulic schematic diagram of Figure 5The flow regeneration check valve 5 therein is arranged in the valve body 4 along the first direction and is connected in the connecting oil passage between the second end of the inner flow passage 71 of the valve stem and the parallel oil supply valve port P2', that is, it is arranged outside the flow regeneration valve 2.

[0085] The above-mentioned integrated valve group 400 and the flow regeneration hydraulic system can be applied to construction machinery with a large boom, such as hydraulic excavators, aerial work machinery, etc., thereby realizing boom flow regeneration at low cost and high efficiency, and saving energy and reducing emissions. The flow regeneration check valve 5 introduces the oil returned when the boom cylinder descends into the parallel oil supply oil passage P2, which can be used as the working oil for other actuators such as slewing and stick.

[0086] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements and other changes made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0087] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0088] In addition, any combination can be made between different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A flow regeneration hydraulic system, characterized in that, The described flow regeneration hydraulic system includes: A boom cylinder hydraulic circuit, including a boom main valve (1) for controlling the telescopic movement of the boom cylinder (100) and an oil supply oil path (P1) connected to the boom main valve (1); A parallel oil supply oil path (P2) for supplying oil in parallel to multiple actuator hydraulic circuits; A flow regeneration valve (2) disposed in a flow regeneration oil path connecting the rodless chamber (A1) of the boom cylinder (100) and the parallel oil supply oil path (P2); A boom auxiliary valve (3) disposed in an auxiliary oil supply oil path connecting the parallel oil supply oil path (P2) and the rodless chamber (A1) of the boom cylinder (100); The boom main valve (1), the flow regeneration valve (2), and the boom auxiliary valve (3) form an integrated valve group (400), and the integrated valve group (400) includes: A first valve stem (7) and a second valve stem (8) that are spaced apart in a first direction inside the valve and can each move the valve core in a second direction perpendicular to the first direction. The first valve stem (7) is provided with a valve stem internal flow path (71); A valve body (4). In the first direction, an end of the valve body (4) close to the first valve stem (7) is provided with a parallel oil supply valve port (P2') connected to the parallel oil supply oil path (P2) and a return oil valve port (T'). An end of the valve body (4) close to the second valve stem (8) is provided with an oil supply valve port (P1') connected to the oil supply oil path (P1) and a rodless chamber connection valve port (A1') and a rod chamber connection valve port (B1') located on both sides of the oil supply port of the cylinder. In the second direction, the two ends of the first valve stem (7) are respectively a regeneration control end (Pa2) and an auxiliary valve control end (Pb2); Wherein, when the auxiliary valve control end (Pb2) is supplied with oil, the rodless chamber connection valve port (A1') is communicated with the parallel oil supply valve port (P2'). When the regeneration control end (Pa2) is supplied with oil, the rodless chamber connection valve port (A1') is unidirectionally communicated with the parallel oil supply valve port (P2') through the valve stem internal flow path (71), and the rodless chamber connection valve port (A1') is throttled and communicated with the return oil valve port (T').

2. The flow regeneration hydraulic system according to claim 1, wherein The flow regeneration valve (2) includes a two-position two-way switch reversing valve and can be switched to a flow conduction position under the control of the regeneration control end (Pa2).

3. The flow regeneration hydraulic system according to claim 2, characterized in that, The flow regeneration valve (2) further includes: A flow regeneration check valve (5) disposed inside the flow regeneration valve (2) and located in the internal communication oil path under the flow conduction position.

4. The flow regeneration hydraulic system according to claim 2, wherein The flow regeneration valve (2) further includes: A flow regeneration check valve (5) is serially arranged with the two-position two-way switch reversing valve in the flow regeneration oil path, and the flow regeneration check valve (5) is disposed closer to the parallel oil supply oil path (P2).

5. The flow regeneration hydraulic system according to claim 2, wherein, The flow regeneration hydraulic system further includes: A series main valve oil path (P3) with one end connected to the parallel oil supply oil path (P2). The boom auxiliary valve (3) and the respective actuator main valves of multiple actuator hydraulic circuits are serially arranged in the series main valve oil path (P3) in sequence; Wherein, the boom auxiliary valve (3) is a two-position four-way reversing valve and switches between a first valve position and a second valve position under the control of an auxiliary valve control end (Pb2). In the first valve position, the auxiliary oil supply circuit is connected and the series main valve circuit (P3) is cut off. In the second valve position, the auxiliary oil supply circuit is cut off and the series main valve circuit (P3) is connected.

6. The flow regeneration hydraulic system according to claim 5, characterized in that, The boom main valve (1) comprises: A first main valve control end (Pa1) for controlling switching to a first switching position for driving the piston rod of the boom cylinder (100) to retract; A second main valve control end (Pb1) is used to control switching to a second switching position for driving the piston rod of the boom cylinder (100) to extend; Wherein, in the first switching position, a throttling hole (6) is provided in the oil return circuit in the valve of the boom main valve (1).

7. The flow regeneration hydraulic system according to claim 6, characterized in that, The integrated valve assembly (400) further comprises: Flow regeneration check valve (5); Wherein, under the control of the first main valve control end (Pa1) and the regeneration control end (Pa2), the cylinder oil supply valve port (P1') is connected to the rod chamber connecting valve port (B1'), and the rodless chamber connecting valve port (A1') is connected to the first end of the valve stem inner flow channel (71), and the regenerated oil flowing out of the second end of the valve stem inner flow channel (71) can open the flow regeneration check valve (5) and flow to the parallel oil supply valve port (P2').

8. The flow regeneration hydraulic system according to claim 7, wherein, The flow regeneration check valve (5) is arranged in the valve body (4) along the second direction and is arranged in a corresponding position at the second end of the flow channel (71) in the valve stem; Alternatively, the flow regeneration check valve (5) is arranged in the valve body (4) along the first direction and connected to the connecting oil path between the second end of the flow channel (71) in the valve stem and the parallel oil supply valve port (P2').

9. An engineering machinery, characterized in that, The construction machine comprises a flow regeneration hydraulic system according to any one of claims 1 to 8.

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