CN217056597U

CN217056597U - Hydraulic control system of engineering machinery and engineering machinery with hydraulic control system

Info

Publication number: CN217056597U
Application number: CN202120410238.7U
Authority: CN
Inventors: 王博; 刘毅; 徐浩祯; 宋超; 郑诗强
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2022-07-26
Anticipated expiration: 2031-02-24

Abstract

The utility model provides an engineering machine tool's hydraulic control system and have its engineering machine tool, wherein, engineering machine tool's hydraulic control system includes: the first control valve comprises a first oil inlet, a first oil outlet, a first working oil port and a second working oil port; the second control valve comprises a second oil inlet, a second oil outlet, a third working oil port and a fourth working oil port; wherein, first work hydraulic fluid port and third work hydraulic fluid port are suitable for the rodless chamber intercommunication with the control hydro-cylinder of equipment, and second work hydraulic fluid port and fourth work hydraulic fluid port are suitable for and have the pole chamber intercommunication with the control hydro-cylinder, and first control valve includes first gear and second gear, and the second control valve includes third gear and fourth gear, the technical scheme of the utility model can recycle the gravitational potential energy that produces when equipment descends, solved the defect that the hydraulic system occupation space of the excavator among the prior art is big simultaneously.

Description

Hydraulic control system of engineering machinery and engineering machinery with hydraulic control system

Technical Field

The utility model relates to an excavator equipment technical field, concretely relates to engineering machine tool's hydraulic control system and have its engineering machine tool.

Background

At present, the transmission of the engineering machinery is mostly driven by hydraulic pressure. The hydraulic excavator performs excavation and unloading operations by a single or combined action of a boom, an arm, a bucket and a swing, an operator operates a pilot handle in a cab to switch a main valve spool, and high-pressure oil pumped by an oil pump is supplied to each working device and is returned from the working device and discharged to an oil tank. Under the current trend of electromotion and intellectualization, the requirements on energy conservation and oil consumption reduction of the excavator are higher and higher, and the effective utilization rate of energy becomes one of important indexes for evaluating the excavator. Because the weight of the movable arm working device of the excavator is large, the problem of gravity potential energy recovery exists when the movable arm working device is lifted to the highest point and then is descended, and if the movable arm working device is not recovered, huge waste can be caused.

In order to solve the above technical problem, some excavators in the prior art store the gravitational potential energy when the boom descends by means of an external valve block and an accumulator. Meanwhile, the stored energy is released when the movable arm rises or other working devices work, and the technical effect of recycling potential energy generated when the movable arm of the excavator descends is achieved. However, in the above technical solution, a valve block and an accumulator need to be additionally arranged in the hydraulic system, so that the whole hydraulic system occupies a large space.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model is to overcome the big defect of hydraulic system occupation space of the excavator among the prior art to an engineering machine's hydraulic control system and have its engineering machine are provided.

In order to solve the above problem, the utility model provides a hydraulic control system of engineering machine tool, include: the first control valve comprises a first oil inlet, a first oil outlet, a first working oil port and a second working oil port; the second control valve comprises a second oil inlet, a second oil outlet, a third working oil port and a fourth working oil port; wherein, the first working oil port and the third working oil port are suitable for being communicated with a rodless cavity of a control oil cylinder of the working device, the second working oil port and the fourth working oil port are suitable for being communicated with a rod cavity of the control oil cylinder, the first control valve comprises a first gear and a second gear, when the first control valve is in the first gear, the first oil inlet is communicated with the first working oil port, the first oil outlet is communicated with the second working oil port, when the first control valve is in the second gear, the first oil inlet is communicated with the second working oil port, the first oil outlet is communicated with the first working oil port, the first working oil port is communicated with the second working oil port, the second control valve comprises a third gear and a fourth gear, when the second control valve is in the third gear, the second oil inlet is communicated with the third working oil port, the second oil outlet is communicated with the fourth working oil port, when the second control valve is in the fourth gear, the third working oil inlet is communicated with the second working oil port, the fourth working oil port is separated from the second oil discharge port.

Optionally, the second control valve further includes a fifth gear, and when the second control valve is in the fifth gear, the second oil inlet, the second oil discharge port, the third working oil port, and the fourth working oil port are isolated from each other.

Optionally, the first control valve includes a first valve body and a first valve core disposed in the first valve body, the first oil inlet, the first oil drain, the first working oil port and the second working oil port are all disposed on the first valve body, a first communicating channel is disposed in the first valve core, a first communicating hole and a second communicating hole that are communicated with the first communicating channel are disposed on an outer side wall of the first valve core, the first valve core is configured such that when the first control valve is in the second gear position, the first communicating hole corresponds to the first working oil port, and the second communicating hole corresponds to the second working oil port.

Optionally, a first one-way circulation structure is arranged in the first communication channel, and the first one-way circulation structure is suitable for one-way circulation of hydraulic oil along the direction from the first communication hole to the second communication hole.

Optionally, the second control valve includes a second valve body and a second valve core disposed in the second valve body, the second oil inlet, the second oil outlet, the third working oil port and the fourth working oil port are disposed on the second valve body, a second communicating channel is disposed in the second valve core, a third communicating hole and a fourth communicating hole communicated with the second communicating channel are disposed on an outer side wall of the second valve core, the second valve core is configured such that when the second control valve is in a fourth gear position, the third communicating hole corresponds to the third working oil port, and the fourth communicating hole corresponds to the second oil inlet.

Optionally, a second one-way flow structure is provided in the second communication passage, the second one-way flow structure being adapted to cause one-way flow of hydraulic oil in a direction from the third communication hole to the fourth communication hole.

Alternatively, the work machine is an excavator and the work implement is a boom of the excavator.

Optionally, the hydraulic control system further includes a first oil supply device and a second oil supply device, the excavator further includes a bucket rod, a bucket and a revolving platform, the first oil supply device includes a first oil supply path, the first oil supply path is communicated with the first oil inlet, a control valve of the bucket rod and a control valve of the bucket, the second oil supply device includes a second oil supply path, and the second oil supply path is communicated with the second oil inlet and a control valve of the revolving platform.

Optionally, the first oil supply path is communicated with the second oil supply path, and a third one-way flow structure is arranged on the first oil supply path and/or the second oil supply path, and the third one-way flow structure is suitable for allowing hydraulic oil to flow from the first oil supply device to the second oil supply device in a one-way manner, or the third one-way flow structure is suitable for allowing hydraulic oil to flow from the second oil supply device to the first oil supply device in a one-way manner.

The utility model also provides an engineering machine tool, including foretell hydraulic control system.

The utility model has the advantages of it is following:

utilize the technical scheme of the utility model, when equipment needs to rise, first control valve is in first gear, and the second control valve is in the third gear, and hydraulic oil gets into from first oil inlet and second oil inlet respectively this moment, and the rodless intracavity that gets into to driving cylinder along first working oil port and third working oil port to make the piston rod stretch out and promote equipment and rise. When the working device descends from a higher position, the first control valve is in a second gear, the second control valve is in a fourth gear, at the moment, one part of hydraulic oil in the rodless cavity enters the first control valve, in the first control valve, one part of hydraulic oil flows back to the oil tank along the first working oil port and the first oil discharge port, and the other part of hydraulic oil flows into the rod cavity of the driving oil cylinder along the first working oil port and the second working oil port for oil supplement, so that the working device is prevented from being blocked; the other part of the hydraulic oil in the rodless cavity enters the second control valve, and the hydraulic oil flows back to the main oil way along the third working oil port and the second oil inlet in the second control valve, so that hydraulic power can be provided for other working devices, and the effect of recovering gravitational potential energy generated when the working devices descend is achieved. In the structure, any valve block or energy accumulator is not needed, and the technical effects of supplementing oil to the rod cavity of the control oil cylinder, collecting gravitational potential energy generated by descending and supplying the gravitational potential energy to other working devices can be realized only by gear shifting of the first control valve and the second control valve when the working device descends, so that the space occupied by the hydraulic system is effectively reduced. Consequently the technical scheme of the utility model the gravitational potential energy that produces when can recycle equipment descends has solved the big defect of hydraulic system occupation space of excavator among the prior art simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic diagram of a hydraulic control system of a construction machine according to the present invention;

FIG. 2 is a schematic diagram of a first control valve of the hydraulic control system of FIG. 1;

FIG. 3 illustrates a schematic diagram of a second control valve of the hydraulic control system of FIG. 1;

FIG. 4 is a schematic diagram illustrating an internal configuration of a first control valve of the hydraulic control system of FIG. 1; and

fig. 5 is a schematic diagram showing an internal structure of a second control valve of the hydraulic control system of fig. 1.

Description of the reference numerals:

10. a first control valve; 11. a first oil inlet; 12. a first oil discharge port; 13. a first working oil port; 14. a second working oil port; 15. a first valve body; 16. a first valve spool; 161. a first communicating passage; 162. a first communication hole; 163. a second communication hole; 164. a first one-way flow structure; 20. a second control valve; 21. a second oil inlet; 22. a second oil drain port; 23. a third working oil port; 24. a fourth working oil port; 25. a second valve body; 26. a second valve core; 261. a second communicating passage; 262. a third communication hole; 263. a fourth communication hole; 264. a second one-way flow structure; 30. a first oil supply device; 31. a first oil supply path; 40. a second oil supply device; 41. a second oil supply path; 50. a bucket rod; 60. a bucket; 70. a control valve of the turntable; 80. a third one-way flow structure.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 3, the hydraulic control system of a construction machine according to the present embodiment includes: the first control valve 10 and the second control valve 20, and the specific structure and arrangement of the first control valve 10 and the second control valve 20 are as follows:

the first control valve 10 includes a first oil inlet 11, a first oil discharge port 12, a first working oil port 13, and a second working oil port 14. And the first control valve 10 comprises a first gear and a second gear, when the first control valve 10 is in the first gear, the first oil inlet 11 is communicated with the first working oil port 13, and the first oil outlet 12 is communicated with the second working oil port 14. When the first control valve 10 is in the second gear, the first oil inlet 11 is communicated with the second working oil port 14, the first oil outlet 12 is communicated with the first working oil port 13, and the first working oil port 13 is communicated with the second working oil port 14.

And a second control valve 20, wherein the second control valve 20 comprises a second oil inlet 21, a second oil outlet 22, a third working oil port 23 and a fourth working oil port 24. And the second control valve 20 comprises a third gear and a fourth gear, when the second control valve 20 is in the third gear, the second oil inlet 21 is communicated with the third working oil port 23, and the second oil outlet 22 is communicated with the fourth working oil port 24. When the second control valve 20 is in the fourth gear, the third working oil port 23 is communicated with the second oil inlet 21, and the fourth working oil port 24 is isolated from the second oil outlet 22.

Further, the first working oil port 13 and the third working oil port 23 are adapted to communicate with a rodless chamber of a control cylinder of the working device, and the second working oil port 14 and the fourth working oil port 24 are adapted to communicate with a rod chamber of the control cylinder.

By using the technical scheme of the embodiment, when the working device needs to ascend, the first control valve 10 is in the first gear, the second control valve 20 is in the third gear, and at this time, hydraulic oil enters from the first oil inlet 11 and the second oil inlet 21 respectively, enters into the rodless cavity of the driving oil cylinder along the first working oil port 13 and the third working oil port 23, and extends out the piston rod to push the working device to ascend. When the working device descends from a higher position, the first control valve 10 is in the second gear, the second control valve 20 is in the fourth gear, at the moment, one part of hydraulic oil in the rodless cavity enters the first control valve 10, one part of the hydraulic oil flows back to the oil tank along the first working oil port 13 and the first oil discharge port in the first control valve 10, the other part of hydraulic oil flows into the rod cavity of the driving oil cylinder along the first working oil port 13 and the second working oil port 14 to be supplemented with oil, and the situation that the working device is stuck is prevented. The other part of the hydraulic oil in the rodless cavity enters the second control valve 20, and in the second control valve 20, the hydraulic oil flows back to the main oil way along the third working oil port 23 and the second oil inlet 21, so that hydraulic power can be provided for other working devices, and the effect of recovering gravitational potential energy generated when the working devices descend is achieved. In the structure, any valve block or energy accumulator is not needed, and the technical effects of supplementing oil to the rod cavity of the control oil cylinder, collecting gravitational potential energy generated by descending and supplying the gravitational potential energy to other working devices can be realized only by changing the gears of the first control valve 10 and the second control valve 20 when the working device descends, so that the space occupied by the hydraulic system is effectively reduced. Therefore, the technical scheme of the embodiment overcomes the defect that the hydraulic system of the excavator in the prior art occupies a large space.

It should be noted that the first control valve 10 and the second control valve 20 control the same driving cylinder, that is, the first working oil port 13 and the third working oil port 23 communicate with a rodless cavity of the same driving cylinder, and the second working oil port 14 and the fourth working oil port 24 communicate with a rod cavity of the same driving cylinder. Therefore, as will be understood by those skilled in the art, when the working device is raised, the first control valve 10 and the second control valve 20 simultaneously supply oil to the rodless chamber, thereby enabling the working device having a large weight to be driven upward. When the working device is lowered, a part of the hydraulic oil in the control cylinder flows to the first control valve 10, and the other part flows to the second control valve 20. In conjunction with the above description, the first control valve 10 may allow a portion of the hydraulic oil to flow from the rodless chamber to the rod chamber of the driving cylinder, thereby achieving an oil supplement effect. The second control valve 20 can collect the high-pressure hydraulic oil in the rodless cavity and supply the high-pressure hydraulic oil to other working devices, so that the effect of collecting the gravitational potential energy of the working devices is achieved.

The work implement described above refers to a component that is driven by hydraulic pressure in a construction machine. In particular, in the present embodiment, the work implement is a boom in an excavator. Of course, the components that are driven by hydraulic pressure and move in the vertical direction in other construction machines are all within the scope of the "working device" described above.

As shown in fig. 2, in the present embodiment, the first control valve 10 is a three-position, four-way selector valve. As can be seen from fig. 2, the first gear is the upper gear in fig. 2, and the second gear is the lower gear in fig. 2. In addition, the first control valve 10 further includes a middle position, the middle position is a cut-off position, and when the first control valve 10 is located in the middle position, the first oil inlet 11, the first oil outlet 12, the first working oil port 13 and the second working oil port 14 are isolated from each other. When the first control valve 10 is in the neutral position, the driving device may be position-locked, and at this time, the driving oil cylinder cannot feed oil from the first control valve 10 nor return oil from the first control valve 10.

As shown in fig. 3, in the technical solution of this example, the second control valve 20 further includes a fifth gear, and when the second control valve 20 is in the fifth gear, the second oil inlet 21, the second oil outlet 22, the third working oil port 23, and the fourth working oil port 24 are isolated from each other. Specifically, as can be seen in FIG. 3, the second control valve 20 is also a three-position, four-way reversing valve. The third gear is the lower gear in fig. 3, and the fourth gear is the upper gear in fig. 3. Further, the fifth gear is the neutral gear in fig. 3, and the fifth gear is a cut-off gear. Wherein the fifth gear has two functions: 1. the fifth gear is matched with the middle position of the first control valve 10, so that the position of the working device can be locked; 2. when the working device descends, if the gravitational potential energy does not need to be recovered (i.e. no other working device needs to supply oil), the first control valve 10 is in the second gear, the second control valve 20 is in the fifth gear, at this time, only the first control valve 10 plays a control role in controlling the control cylinder, and the second control valve 20 does not work (i.e. does not recover the gravitational potential energy). The fifth gear is arranged on the second control valve 20, so that the control mode of the control oil cylinder is more various and more flexible.

Of course, it will be understood by those skilled in the art that the three gear positions of the first control valve 10 and the three gear positions of the second control valve 20 can be flexibly combined for the control of the driving cylinder, for example, when only one control valve is needed to control the extension of the piston rod of the driving cylinder, the first control valve 10 can be in the first gear position, the second control valve 20 can be in the fifth gear position, or the first control valve 10 can be in the middle gear position and the second control valve 20 can be in the third gear position. The skilled person can flexibly adjust the gears of the first control valve 10 and the second control valve 20 according to the actual working requirement, and is not limited to the above-mentioned gear matching manner.

As shown in fig. 4, in the present embodiment, the first control valve 10 includes a first valve body 15 and a first valve spool 16 provided in the first valve body 15. The first oil inlet 11, the first oil outlet 12, the first working oil port 13 and the second working oil port 14 are all arranged on the first valve body 15. A first communication passage 161 is provided in the first valve body 16, and a first communication hole 162 and a second communication hole 163 communicating with the first communication passage 161 are provided on an outer side wall of the first valve body 16. Further, the first valve body 16 is disposed such that the first communication hole 162 corresponds to the first working port 13 and the second communication hole 163 corresponds to the second working port 14 when the first control valve 10 is in the second position. Specifically, the different gear positions of the first control valve 10, i.e., the first spool 16, are in different positions after moving within the first valve body 15. Referring to fig. 4, it will be understood by those skilled in the art that the first working port 13 and the first discharge port 12 communicate through a groove formed in the outer surface of the first spool 16 when the first control valve 10 is in the second shift position. Meanwhile, the hydraulic oil entering from the first working oil port 13 flows to the second working oil port 14 along the first communication hole 162, the first communication channel 161 and the second communication hole 163, so that the hydraulic oil flows back to the rod cavity of the control cylinder to supplement the oil in time, and the phenomenon of air suction and blockage is prevented.

It should be noted that, when the first control valve 10 is in the first gear position or the neutral position, the first communication passage 161 does not serve to communicate the two oil ports of the first valve body 15, as will be understood by those skilled in the art with reference to fig. 1 and 4.

As shown in fig. 4, in the solution of the present embodiment, a first one-way flow structure 164 is disposed in the first communication channel 161, and the first one-way flow structure 164 is adapted to make the hydraulic oil flow in one direction along the direction from the first communication hole 162 to the second communication hole 163. Specifically, the first one-way flow structure 164 has a throttling effect on the hydraulic oil flowing through the first communication passage 161. Preferably, the first one-way flow structure 164 is a one-way valve.

As shown in fig. 5, in the solution of the present embodiment, the second control valve 20 includes a second valve body 25 and a second valve spool 26 disposed in the second valve body 25. The second oil inlet 21, the second oil discharge port 22, the third working oil port 23 and the fourth working oil port 24 are all disposed on the second valve body 25. A second communication passage 261 is provided in the second spool 26, and a third communication hole 262 and a fourth communication hole 263 that communicate with the second communication passage 261 are provided on an outer side wall of the second spool 26. Further, the second valve body 26 is configured such that, when the second control valve 20 is in the fourth range position, the third communication hole 262 corresponds to the third hydraulic port 23, and the fourth communication hole 263 corresponds to the second oil inlet 21. Specifically, the different gear positions of the second control valve 20, i.e., the second spool 26, are in different positions after moving within the second valve body 25. Referring to fig. 5, it can be understood by those skilled in the art that when the first control valve 10 is in the second shift position, hydraulic oil in the rodless chamber of the control cylinder enters from the third working oil port 23, and then flows into the second oil inlet 21 along the third communication hole 262, the second communication channel 261, and the fourth communication hole 263, so that high-pressure hydraulic oil flows back to the main oil passage, thereby providing driving force for other working devices. As can also be seen from fig. 4, a blocking check valve is arranged in the flow passage at the bottom of the second valve body 25, and the blocking check valve is provided with a pilot oil port. When the second control valve 20 is in the fourth gear, the pilot oil lifts the latching check valve, thereby allowing high-pressure hydraulic pressure to flow to the main oil passage.

It should be noted that, when the second control valve 20 is in the third gear or the fifth gear, the second communication passage 261 does not serve to communicate the two oil ports of the second valve body 25, as will be understood by those skilled in the art with reference to fig. 1 and 5.

As shown in fig. 5, in the solution of the present embodiment, a second one-way circulation structure 264 is provided in the second communication channel 261, and the second one-way circulation structure 264 is adapted to make the hydraulic oil circulate in one way along the direction from the third communication hole 262 to the fourth communication hole 263. Specifically, the second one-way flow structure 264 acts as a throttle for the hydraulic oil flowing through the second communication passage 261. Preferably, the second one-way flow structure 264 is a one-way valve.

Above, the specific structure and the operation principle of the first control valve 10 and the second control valve 20 in the hydraulic control system are described, and other components in the hydraulic control system will be described below.

As shown in fig. 1, the hydraulic control system further includes a first oil supply device 30 and a second oil supply device 40. The excavator further includes a stick 50, a bucket 60, and a turntable. The first oil supply device 30 includes a first oil supply path 31, the first oil supply path 31 is communicated with the first oil inlet 11, the control valve of the arm 50 and the control valve of the bucket 60, and the second oil supply device 40 includes a second oil supply path 41, and the second oil supply path 41 is communicated with the second oil inlet 21 and the control valve 70 of the rotary table. Specifically, the first oil supply device 30 and the second oil supply device 40 are two independent oil pumps, and the first oil supply device 30 supplies oil to the control cylinder of the boom (via the first control valve 10), the control cylinder of the arm 50, and the control cylinder of the bucket 60. The second oil supply device 40 can supply oil to the control cylinder of the boom (via the second control valve 20) and the control cylinder of the turntable. Further, as will be understood by those skilled in the art, the hydraulic oil recovered after the boom is lowered by the second control valve 20 flows into the second oil supply passage 41.

As shown in fig. 1, the first oil supply path 31 is communicated with the second oil supply path 41, and a third one-way flow structure 80 is provided on the first oil supply path 31 and/or the second oil supply path 41, the third one-way flow structure 80 is adapted to enable hydraulic oil to flow from the first oil supply device 30 to the second oil supply device 40 in one way, or the third one-way flow structure 80 is adapted to enable hydraulic oil to flow from the second oil supply device 40 to the first oil supply device 30 in one way. Specifically, in the above structure, the first oil supply path 31 and the second oil supply path 41 are merged, and the third one-way flow structure 80 enables the hydraulic oil to flow in one direction after being merged, so that the control diversity of different working devices in the excavator is improved, and different control strategies are selected.

In the present embodiment, the third one-way flow structure 80 is a one-way valve that can make the hydraulic oil in the second oil supply path 41 flow into the first oil supply path 31 and join together, so that various control strategies can be selected. For example, the second oil supply device 40 may supply oil to not only the boom drive cylinder and the turntable control cylinder by the second control valve 20 but also the boom drive cylinder, the arm 50 drive cylinder, and the bucket 60 drive cylinder by the first control valve 10 after flowing to the first oil supply path 31. The high-pressure hydraulic oil recovered by the second control valve 20 may be supplied to the work implement through the second oil supply passage 41 and the first oil supply passage 31.

In combination with the above components in the hydraulic control system, the following specific control modes of the hydraulic system are exemplified:

1. the movable arm descends independently: the first control valve 10 is in the second gear, and the second control valve 20 is in the fifth gear;

2. the boom is lowered alone, and the other working devices are operated: the first control valve 10 is in the second gear, and the second control valve is in the fourth gear;

3. the movable arm rises, the rotary table acts: the first oil supply device 30 controls a driving cylinder of the boom through the first control valve 10, and the second oil supply device 40 controls a driving cylinder of the turn table; or, the first oil supply device 30 controls the driving cylinder of the boom through the first control valve 10, the second oil supply device 40 controls the driving cylinder of the turret, meanwhile, the second oil supply device 40 controls the driving cylinder of the boom through the second control valve 20, and the flow distribution between the second control valve 20 and the control valve 70 of the turret is performed through a priority valve;

4. the movable arm rises, the rotary table moves, and the bucket rod moves: the first oil supply device 30 controls the driving cylinder of the boom and the driving cylinder of the arm 50 through the first control valve 10, the second oil supply device 40 controls the driving cylinder of the turret, and at the same time, the second oil supply device 40 controls the driving cylinder of the boom through the second control valve 20, and flow distribution is performed between the second control valve 20 and the control valve 70 of the turret through a priority valve.

In addition, each node in the hydraulic system schematic diagram in fig. 1 means: ba (head) is a rodless cavity connecting node of the movable arm control oil cylinder; bb (rod) is a connecting node of a rod cavity of the movable arm control oil cylinder; WsA and WsB are connecting nodes of the driving oil cylinders of the rotary table; t1 is an external tank connection node; dr1-3 oil discharge connection node; bm rege signal node. Therefore, the skilled person can understand the complete operation principle of the hydraulic control system in fig. 1 by combining the signs of the hydraulic components in fig. 1, the connection mode of the hydraulic components and the meaning of the nodes.

In combination with the above description, the hydraulic control system in the present embodiment has the following advantages:

1. when the movable arm descends, hydraulic oil can be regenerated from the rodless cavity to the rod cavity from the interior of the first valve core 16 through the first control valve 10, the hydraulic oil can be collected through the second control valve 20 and can be supplied to other working devices to work, and the energy-saving and consumption-reducing performance of the excavator is improved;

2. different working device control strategies can be selected by identifying different loads of the excavator, so that the oil consumption of the excavator is greatly reduced, and the efficiency is improved.

The embodiment also provides engineering machinery which comprises the hydraulic control system.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A hydraulic control system for a construction machine, comprising:

the hydraulic control system comprises a first control valve (10), wherein the first control valve (10) comprises a first oil inlet (11), a first oil outlet (12), a first working oil port (13) and a second working oil port (14);

the second control valve (20), the second control valve (20) includes a second oil inlet (21), a second oil outlet (22), a third working oil port (23) and a fourth working oil port (24);

wherein the first working oil port (13) and the third working oil port (23) are suitable for being communicated with a rodless cavity of a control oil cylinder of a working device, the second working oil port (14) and the fourth working oil port (24) are suitable for being communicated with a rod cavity of the control oil cylinder,

the first control valve (10) comprises a first gear and a second gear, when the first control valve (10) is in the first gear, the first oil inlet (11) is communicated with the first working oil port (13), the first oil outlet (12) is communicated with the second working oil port (14), when the first control valve (10) is in the second gear, the first oil inlet (11) is communicated with the second working oil port (14), the first oil outlet (12) is communicated with the first working oil port (13), and the first working oil port (13) is communicated with the second working oil port (14),

the second control valve (20) comprises a third gear and a fourth gear, the second control valve (20) is located in the third gear, the second oil inlet (21) is communicated with the third working oil port (23), the second oil discharge port (22) is communicated with the fourth working oil port (24), the second control valve (20) is located in the fourth gear, the third working oil port (23) is communicated with the second oil inlet (21), and the fourth working oil port (24) is isolated from the second oil discharge port (22).

2. The hydraulic control system according to claim 1, wherein the second control valve (20) further comprises a fifth gear, and when the second control valve (20) is in the fifth gear, the second oil inlet (21), the second oil outlet (22), the third working oil port (23) and the fourth working oil port (24) are isolated from each other.

3. The hydraulic control system according to claim 1 or 2, wherein the first control valve (10) includes a first valve body (15) and a first spool (16) disposed in the first valve body (15), the first oil inlet (11), the first oil discharge port (12), the first working oil port (13), and the second working oil port (14) are all disposed on the first valve body (15), a first communication passage (161) is disposed in the first spool (16), a first communication hole (162) and a second communication hole (163) communicating with the first communication passage (161) are disposed on an outer side wall of the first spool (16),

the first valve element (16) is configured such that when the first control valve (10) is in the second position, the first communication hole (162) corresponds to the first working port (13), and the second communication hole (163) corresponds to the second working port (14).

4. The hydraulic control system according to claim 3, characterized in that a first one-way flow structure (164) is provided in the first communication passage (161), the first one-way flow structure (164) being adapted to cause one-way flow of hydraulic oil in a direction from the first communication hole (162) to the second communication hole (163).

5. The hydraulic control system according to claim 1 or 2, wherein the second control valve (20) includes a second valve body (25) and a second spool (26) provided in the second valve body (25), the second oil inlet (21), the second oil discharge port (22), the third working oil port (23), and the fourth working oil port (24) are all provided on the second valve body (25), a second communication passage (261) is provided in the second spool (26), a third communication hole (262) and a fourth communication hole (263) that communicate with the second communication passage (261) are provided on an outer side wall of the second spool (26),

the second valve core (26) is configured such that when the second control valve (20) is in the fourth gear position, the third communication hole (262) corresponds to the third working oil port (23), and the fourth communication hole (263) corresponds to the second oil inlet (21).

6. The hydraulic control system according to claim 5, characterized in that a second one-way flow structure (264) is provided in the second communication passage (261), the second one-way flow structure (264) being adapted to cause one-way flow of hydraulic oil in a direction from the third communication hole (262) to the fourth communication hole (263).

7. The hydraulic control system according to claim 1 or 2, characterized in that the working machine is an excavator, and the working device is a boom of the excavator.

8. The hydraulic control system according to claim 7, further comprising a first oil supply device (30) and a second oil supply device (40), wherein the excavator further comprises an arm (50), a bucket (60), and a turntable, wherein the first oil supply device (30) comprises a first oil supply path (31), wherein the first oil supply path (31) is communicated with the first oil inlet (11), a control valve of the arm (50), and a control valve of the bucket (60), wherein the second oil supply device (40) comprises a second oil supply path (41), and wherein the second oil supply path (41) is communicated with the second oil inlet (21) and a control valve (70) of the turntable.

9. The hydraulic control system according to claim 8, characterized in that the first oil supply passage (31) communicates with the second oil supply passage (41), and a third one-way flow structure (80) is provided on the first oil supply passage (31) and/or the second oil supply passage (41),

the third one-way flow structure (80) is suitable for enabling hydraulic oil to flow from the first oil supply device (30) to the second oil supply device (40) in a one-way mode, or the third one-way flow structure (80) is suitable for enabling hydraulic oil to flow from the second oil supply device (40) to the first oil supply device (30) in a one-way mode.

10. A working machine, characterized by comprising a hydraulic control system according to any one of claims 1-9.