CN113700689A

CN113700689A - Excavator and hydraulic control system thereof

Info

Publication number: CN113700689A
Application number: CN202110981737.6A
Authority: CN
Inventors: 杨家国; 刘荣; 张龙; 李勇强; 秦勇
Original assignee: Zoomlion Earth Moving Machinery Co Ltd
Current assignee: Zoomlion Earth Moving Machinery Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2021-11-26

Abstract

The invention discloses an excavator and a hydraulic control system thereof, wherein the excavator comprises an excavator main valve; the working accessory control valve group is used for controlling an actuating element of a working accessory and is arranged in a working accessory working oil path between the actuating element and the excavator main valve; the pilot control valve group is at least used for pilot control of the working accessory control valve group; the excavator main valve, the working accessory control valve and the pilot control valve group are all arranged on a main frame or an excavator arm of the excavator. The control valve group of the working accessory is uniformly arranged on a main frame or a digging arm of the digging machine, and the high-pressure oil way controls the working accessory after passing through the digging arm. Therefore, the main engine is large in space, flexible in operability and high in layout flexibility, and layout can be carried out according to the actual space of the excavator. In addition, the electric control adjustment of the proportion can be realized, different working speeds can be realized, multi-stage safety protection can be increased, and the service life of accessories can be prolonged.

Description

Excavator and hydraulic control system thereof

Technical Field

The invention belongs to the field of engineering machinery, and particularly relates to an excavator and a hydraulic control system thereof.

Background

The excavator has more types of working accessories, and part of the working accessories need to be provided with independent special control valve sets, so the control mode is quite rich. The special control valve group has complex structure and high cost, is not easy to be connected with a hydraulic system of the excavator, and is more difficult to maintain.

In the excavator in the market at present, in terms of structural layout, control valve sets of part of working accessories are arranged in corresponding working accessories, the working accessories are located at the foremost end of an excavator arm, and the control valve sets of the working accessories are often controlled by an independent controller. Because the space of the working accessory is small, the available space of the control valve group is smaller, and some special functions cannot be realized. And the vibration of part of the working accessories is large, so that the control valve group in the accessories is easy to damage.

Disclosure of Invention

The invention aims to provide an excavator and a hydraulic control system thereof, which have better control performance on working accessories and longer service life.

To achieve the above object, the present invention provides a hydraulic control system of an excavator, the hydraulic control system including:

an excavator main valve;

the working accessory control valve group is used for controlling an actuating element of a working accessory and is arranged in a working accessory working oil path between the actuating element and the excavator main valve; and

the pilot control valve group is at least used for pilot control of the working accessory control valve group;

the excavator main valve, the working accessory control valve group and the pilot control valve group are all arranged on a main frame or an excavator arm of the excavator.

In some embodiments, the hydraulic control system further comprises a shovel host controller, and the shovel main valve, the pilot valve set, and the plurality of work attachment control valve sets are all controlled by the shovel host controller.

In some embodiments, the pilot valve block comprises a control oil inlet, a plurality of control oil outlets, and a plurality of solenoid directional valves disposed in parallel between the control oil inlet and each of the control oil outlets, the control oil outlet conduits being at least partially connected to the work attachment valve block of the corresponding control.

In some embodiments, the hydraulic control system further includes a pilot control oil passage connected to the control oil inlet, and a pilot solenoid valve and a pilot pump are disposed in series in the pilot control oil passage.

In some embodiments, the actuating element of the working accessory includes a vibration motor, the excavator main valve includes a main valve backup working port for supplying oil to the vibration motor, and the pilot valve group includes a first electromagnetic directional valve having a first control oil outlet, and the first control oil outlet is connected to the excavator main valve through a pipeline and is in pilot control over on/off of the main valve backup working port.

In some embodiments, the pilot valve set includes a second solenoid directional valve having a second control oil outlet, the excavator main valve includes a normally open outlet port, and the second control oil outlet conduit is connected to the excavator main valve and pilot controls the main valve backup working port together with the first control oil outlet.

In some embodiments, the implement of the work attachment comprises a rotary motor, the work attachment control valve set comprises a rotary motor control valve set disposed in a rotary motor work oil path between the rotary motor and a normally open output port of the excavator main valve;

and the pilot control valve group comprises a third electromagnetic directional valve with a third control oil outlet and a fourth electromagnetic directional valve with a fourth control oil outlet, and the third control oil outlet and the fourth control oil outlet are respectively connected to the control oil ports at two ends of the rotary motor control valve group through pipelines.

In some embodiments, the first, second, third and fourth electromagnetic directional valves are proportional solenoid valves.

In some embodiments, an outlet end of the rotary motor control valve group is connected with an overflow oil return path, and an overflow valve and a check valve are arranged on the overflow oil return path in parallel.

In some embodiments, the actuating element of the working attachment comprises a clamping cylinder, the working attachment control valve group comprises a clamping cylinder control valve group, and the clamping cylinder control valve group is arranged in a clamping cylinder working oil path between the clamping cylinder and a normally open output oil port of the excavator main valve;

the pilot control valve group comprises a fifth electromagnetic directional valve with a fifth control oil outlet and a sixth electromagnetic directional valve with a sixth control oil outlet, and the fifth control oil outlet and the sixth control oil outlet are respectively connected to control oil ports at two ends of the clamping oil cylinder control valve group through pipelines.

In some embodiments, the clamping cylinder pilot valve block includes a pilot operated check valve disposed on one side of the outlet end.

In some embodiments, the rotary motor control valve pack and the clamping cylinder control valve pack each include a three-position, four-way reversing valve.

In some embodiments, the three-position, four-way reversing valve is a hydraulically controlled reversing valve or an electromagnetic reversing valve or a proportional electromagnetic reversing valve;

and/or the oil inlets of the rotary motor control valve group and the clamping oil cylinder control valve group are provided with damping joints or throttle valves;

and/or damping joints or throttle valves are arranged in pilot control oil paths between the first control oil outlet and the excavator main valve and between the second control oil outlet and the excavator main valve.

In some embodiments, the working implements include buckets, breakers, drivers, hydraulic shears, crushing tongs, olecranon shears, demolition shears, grapples, stone grabbers, lotus grabs, breakers, tree movers, and vibratory rams.

In addition, the invention also provides an excavator, which comprises the hydraulic control system of the excavator.

In the invention, the control valve set of the working accessory is uniformly arranged on the main frame or the excavator arm of the excavator, the control valve set is directly and uniformly controlled by the excavator main controller, and the high-pressure oil way controls the working accessory after passing through the excavator arm. The host computer space is big, and the overall arrangement flexibility is strong, can carry out the overall arrangement according to digging quick-witted actual space. The operability is flexible, the economy is good, an independent controller is not required to be added, and the adjustment is convenient.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 illustrates a hydraulic schematic diagram of a hydraulic control system of an excavator according to an embodiment of the present invention;

fig. 2 illustrates the relative positional relationship of the respective structural components in the excavator according to the embodiment of the present invention.

Description of the reference numerals

100 host vehicle frame 200 excavator arm

300 work attachment 400 work attachment control valve group

500 pilot control valve group 600 excavator main valve

301 vibration motor 302 rotary motor

303 clamping oil cylinder

401 rotary motor valve block 402 clamp cylinder valve block

1 three-position four-way reversing valve 2 overflow valve

3 check valve 4 hydraulic control check valve

A1 first control oil outlet A2 second control oil outlet

A3 third control oil outlet a4 fourth control oil outlet

A5 fifth control oil outlet A6 sixth control oil outlet

P control oil inlet T oil tank

P0 normally open output port B0 main valve spare working port

P1 rotary motor valve group oil inlet P2 clamping oil cylinder valve group oil inlet

T1 rotary motor valve block oil return port T2 clamp cylinder valve block oil return port

A11 first rotary motor valve group working oil port

B11 second rotary motor valve group working oil port

A21 first clamping cylinder valve group working oil port

B21 second clamping cylinder valve group working oil port

XA1 first rotary motor valve group control oil port

XB1 second rotary motor valve bank control oil port

XA2 first clamping cylinder valve group control oil port

XB2 second clamping cylinder valve group control oil port

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

An excavator and a hydraulic control system thereof according to the present invention will be described with reference to the accompanying drawings.

As described above, in a common excavator, the working attachment is generally located at the foremost end of the excavator arm, the control valve group of the working attachment is also installed in the working attachment, and the control valve group is often controlled by an independent controller, so that the available space of the valve group is smaller due to the small attachment space, and some special functions cannot be realized. On the basis, part of the working accessories also need to lengthen or weight the excavator arm, so that a better working effect can be achieved. However, the working attachment having vibration brings about larger (high frequency) vibration, which causes the control valve group in the working attachment to be easily damaged, and the pilot control oil passage of the hydraulically controlled control valve group has a longer control distance and a significantly slower response speed.

In view of the above, the present invention discloses a hydraulic control system for an excavator. In the embodiment shown in fig. 1 and 2, the hydraulic control system includes an excavator main valve 600 for controlling an actuator of the excavator, an accessory control valve group 400, and a pilot control valve group 500, the accessory control valve group 400 is used for controlling the actuator of the accessory 300 and is provided in an accessory working oil passage between the actuator and the excavator main valve 600; the pilot control valve group 500 is at least used for pilot control of the work accessory control valve group 400; the excavator main valve 600, the work attachment control valve group 400 and the pilot control valve group 500 are all disposed on the main frame 100 or the excavator arm 200 of the excavator.

It can be seen that, in the present invention, the working accessory control valve set 400 and the pilot control valve set 500 for controlling the actuator of the working accessory 300 are not installed in the working accessory with a narrow space, but are both installed on the main frame 100 or the excavator arm 200, so as to avoid the damage of the working vibration of the accessory to the control valve set, and the installation space on the main frame 100 or the excavator arm 200 is also larger, so as to allow for more function control and faster control response.

In addition, after the working accessory control valve group 400 and the pilot control valve group 500 thereof are arranged on the main machine 100 or the excavator arm 200, the working accessory control valve group is closer to the excavator main valve 600, the control distance is short, the working accessory control valve group and the excavator main valve 600 can be integrally and centrally controlled together through an excavator main machine controller, the control mode is simpler, the operation is convenient, and the control response is faster.

In the embodiment of fig. 1 and 2, the work attachment control valve group 400 and the pilot control valve group 500 are mounted on the main frame 100 and controlled by the shovel main body controller, as an example. The pilot control oil path output from the working attachment control valve group 400 directly controls the working attachment after passing through the excavator arm 200. Of course, the work attachment control valve block 400 and its pilot valve block 500 may alternatively be mounted on the backhoe arm 200.

Referring to fig. 1, the pilot valve block 500 is used for pilot-controlling the working accessory control valve block 400 and includes a control oil inlet P, a plurality of control oil outlets, and a plurality of electromagnetic directional valves disposed in parallel between the control oil inlet P and each control oil outlet, and the control oil outlet pipes are connected to at least the working accessory control valve block 400 controlled correspondingly. In the present embodiment, the number of the solenoid directional valves is 6, and the actuators for controlling 3 work tools and the excavator main valve 600 are controlled, but it is obvious that the number of the solenoid directional valves, the number of the actuators, and the like are not limited to this.

In addition, the hydraulic control system further includes a pilot control oil path connected to the control oil inlet P, a pilot solenoid valve and a pilot pump are serially arranged in the pilot control oil path, and the pilot control oil path, the pilot solenoid valve thereof, and the pilot pump are not shown in fig. 1, but those skilled in the art can understand that the pilot pump pumps the control oil through a dedicated oil line of the pilot control oil path, and the control oil can be continuously input to the control oil inlet P of the pilot valve group 500 in a specific operating mode.

In this embodiment, the actuator of the working accessory 300 first includes the vibration motor 301, the excavator main valve 600 includes the main backup working port B0 for supplying oil to the vibration motor 301, the pilot control valve set 500 includes the first electromagnetic directional valve having the first control oil outlet a1, and the first control oil outlet a1 is connected to the excavator main valve 600 by a pipeline and pilot controls the on/off of the main backup working port B0 and the amount of oil for outputting high pressure oil.

Specifically, the excavator main valve 600 includes a main backup, a directional control valve as a working oil path of the vibration motor 301, and when the first electromagnetic directional valve is powered, the control oil flowing out from the first control oil outlet a1 flows to the control port of the main backup, so that the main backup working port B0 of the main backup is opened and the high-pressure oil is delivered to the forward port of the vibration motor 301 through the main backup working port B0. The reverse oil port of the vibration motor 301 returns to the oil tank T through the oil return passage.

In the present embodiment, the pilot valve group 500 further includes a second electromagnetic directional valve having a second control oil outlet a2, and the second control oil outlet a2 is plumbed to the excavator main valve 600 and pilot-controls the main valve backup working port B0 in common with the first control oil outlet a 1. In other words, the first electromagnetic directional valve and the second electromagnetic directional valve pilot-control the output oil amount of the main backup hydraulic fluid port B0 in common.

Specifically, the control oil flowing out of the first control oil outlet a1 flows to the control port of the master backup pair, and the corresponding first oil pump (not shown) can be driven to operate, so that high-pressure oil is output from the master backup working port B0; similar to the first control oil outlet a1, the control oil flowing out of the second control oil outlet a2 may act on a valve element of a confluence valve in the excavator main valve 600, and drive a corresponding second oil pump (not shown) to operate, high-pressure oil generated by the second oil pump flows to the main backup working port B0 through the confluence valve, and two high-pressure oil flows out from the main backup working port B0 in a confluence manner, so that the two high-pressure oil flows in the dual-pump valve and is supplied to the vibration motor 301.

When the vibration motor 301 is controlled to operate, a first control mode may be adopted, that is, the first electromagnetic directional valve and the second electromagnetic directional valve are sequentially controlled electrically. Firstly, the first electromagnetic directional valve is electrified, the single pump works, a certain amount of high-pressure oil is output from the main valve spare working oil port B0, and the vibration motor 301 obtains relatively low working vibration frequency; when the vibration motor 301 needs to obtain higher working vibration frequency, the first electromagnetic directional valve and the second electromagnetic directional valve can be powered on simultaneously, the double pumps work, the main valve standby working oil port B0 is converged to output higher-flow high-pressure oil, and the vibration motor 301 obtains higher vibration frequency. The disadvantage of this control method is that the wear of the two pumps is inconsistent, which results in poor coordination of the overall operation.

The second control mode for controlling the operation of the vibration motor 301 is that the first electromagnetic directional valve and the second electromagnetic directional valve are always synchronously powered, that is, the vibration motor 301 is always operated and output for double-pump operation, but the flow of the high-pressure oil passing through the main valve backup working oil port B0 is different by adjusting the current amounts of the first electromagnetic directional valve and the second electromagnetic directional valve. Therefore, the vibration motor 301 can be driven to work at a smaller working vibration frequency under the control of a small current amount at the beginning, and further, the vibration motor 301 can be driven to work at a larger working vibration frequency under the control of a large current amount when needed. Under the control mode, the abrasion degrees of the double pumps are the same, and the synchronism is good.

Optionally, the actuator of the working attachment 300 further includes a rotary motor 302, the working attachment control valve group 400 includes a rotary motor control valve group 401, the rotary motor control valve group 401 is disposed in a rotary motor working oil path between the rotary motor 302 and the normally open output port P0 of the excavator main valve 600; the normally open output oil port P0 is always kept in a normally open state in a working state, and a high-pressure oil state is always kept on a main oil path between the normally open output oil port P0 and the rotary motor valve block oil inlet P1; and, the pilot control valve group 500 includes a third electromagnetic directional valve having a third control oil outlet A3 and a fourth electromagnetic directional valve having a fourth control oil outlet a4, the third control oil outlet A3 and the fourth control oil outlet a4 are respectively connected to the control ports at two ends of the rotary motor control valve group 401 through pipes, that is, the first rotary motor valve group control port XA1 and the second rotary motor valve group control port XB1 at two ends of the three-position four-way directional valve 1 in the rotary motor control valve group 401, so as to control the flow direction and the on-off of the high pressure oil from the rotary motor control valve group 401 to the rotary motor 302.

When the third and fourth electromagnetic directional valves are powered off according to a logical relationship, the output control oil acts on the first rotary motor valve group control oil port XA1 and the second rotary motor valve group control oil port XB1 of the rotary motor control valve group 401, the high-pressure oil from the normally open output oil port P0 of the excavator main valve 600 enters the rotary motor control valve group 401 through the rotary motor valve group oil inlet P1, and then acts on the actuator after passing through the rotary motor control valve group 401, and the rotary motor 302 starts to operate. Finally, the hydraulic oil eventually returns to tank T from rotary motor valve set return T1.

In the embodiment, in particular, the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve and the fourth electromagnetic directional valve all adopt proportional electromagnetic valves, and different quantities can be output according to the given current magnitude, so that the adjustment of different working speeds can be realized. Therefore, the adaptability is stronger, different working speeds can be realized by adjusting the current, and the defect that only a single working speed exists is overcome. Of course, the present invention is not limited thereto, and the proportional output or the switching output of each electromagnetic directional valve can be determined according to the control characteristics of the actuator.

In addition, an outlet end of the rotary motor control valve block 401 (i.e., one end having the first rotary motor valve block working port a11 and the second rotary motor valve block working port B11) is connected to an overflow oil return path, and an overflow valve 2 and a check valve 3 are connected in parallel to the overflow oil return path, as shown in fig. 1. Thus, the device can play the roles of overload protection and oil supplement.

In the present embodiment, the actuator of the working attachment 300 further includes a clamping cylinder 303, the working attachment control valve group 400 includes a clamping cylinder control valve group 402, and the clamping cylinder control valve group 402 is disposed in a clamping cylinder working oil path between the clamping cylinder and the normally open output port P0 of the excavator main valve 600; and the pilot control valve group 500 includes a fifth electromagnetic directional valve having a fifth control oil outlet a5 and a sixth electromagnetic directional valve having a sixth control oil outlet a6, the fifth control oil outlet a5 and the sixth control oil outlet a6 are respectively connected to control ports at two ends of the clamping cylinder control valve group 402 through pipes, that is, a first clamping cylinder valve group control port XA2 and a second clamping cylinder valve group control port XB2, so as to control the flow direction and the on/off of high-pressure oil from the clamping cylinder control valve group 402 to the clamping cylinder 303.

When the fifth electromagnetic directional valve and the sixth electromagnetic directional valve are powered off according to a logical relation, the output control oil acts on a first clamping cylinder valve group control oil port XA2 and a second clamping cylinder valve group control oil port XB2 of the clamping cylinder control valve group 402, high-pressure oil from a normally open output oil port P0 of the excavator main valve 600 enters the clamping cylinder control valve group 401 through a clamping cylinder valve group oil inlet P2, and then acts on an execution element after passing through the clamping cylinder control valve group 402, and the clamping cylinder 303 starts to work. Finally, the hydraulic oil finally returns to tank T from clamp cylinder valve set return port T2.

The clamping cylinder control valve set 402 includes a hydraulic control check valve 4 disposed on one side of the outlet end (i.e., one end having a first clamping cylinder valve set working port a21 and a second clamping cylinder valve set working port B21), and can function as a hydraulic lock to prevent the cylinder piston from retracting with load.

In fig. 1, as an example, each of the fifth electromagnetic directional valve and the sixth electromagnetic directional valve has only on-off control, i.e., an on-off amount electromagnetic valve output, in response to the operating characteristics of the clamp cylinder 303. The reversing valves in the rotary motor control valve group 401 and the clamping cylinder control valve group 402 are three-position four-way reversing valves 1, and comprise left and right reversing positions and a middle stopping position. The reversing valve can adopt other structures or have more switching positions or oil ports, but the reversing valve is within the protection scope of the invention.

Alternatively, the three-position four-way reversing valve 1 can also adopt a proportional solenoid valve, so that the three-position four-way reversing valve can be directly controlled by current and can also realize different working speed regulation. Oil inlets of the rotary motor control valve group 401 and the clamping oil cylinder control valve group 402 can also be provided with damping joints or throttle valves, and different working speed adjustment can also be realized. Similarly, damping joints or throttle valves are provided in the pilot control oil passages between the first control oil outlet a1 and the excavator main valve 600 and between the second control oil outlet a2 and the excavator main valve 600, and different operation speed adjustments can be achieved, which also fall within the scope of the present invention.

The actuator of the work attachment is not limited to the vibration motor 301, the rotation motor 302, the clamp cylinder 303, and the like, and may be additionally provided in practice. Accordingly, the number of electromagnetic directional valves in pilot valve group 5 is also increased. Accordingly, it will be appreciated by those skilled in the art that the working attachment 300 may employ one or more of a bucket, a demolition hammer, a pile driver, a hydraulic shear, a crushing tong, an olecranon shear, a demolition shear, a wood grabber, a stone grabber, a lotus grab, a crushing bucket, a tree mover, and a vibratory tamper.

In the invention, the working accessory control valve group 400, the pilot control valve group 500 and other valve groups are all arranged on the main locomotive frame 100 or the excavator arm 200 of the excavator and are directly controlled by the excavator main locomotive controller, and an oil path controls the working accessory after passing through the excavator arm 200, compared with the mode of directly installing the working accessory, the working accessory control valve group is not required to pass through the excavator arm 200 by a conducting wire. And the space of the host is large, so that the operability is flexible.

On the basis, the invention correspondingly discloses an excavator, which comprises the hydraulic control system of the excavator. In the excavator, proportional electric control adjustment can be realized, and the adaptability is stronger. By adjusting the current, different working speeds can be realized, and the defect that only a single working speed is realized is overcome. In addition, multi-stage safety protection is added, hydraulic protection in the working and stopping processes of the hydraulic actuating element is realized, and the service life of the accessory is further prolonged. In addition, the economy is good, a separate controller is not required to be added, and the adjustment is convenient; the layout flexibility is strong, and the layout can be carried out according to the actual space of the excavator.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A hydraulic control system of an excavator, the hydraulic control system comprising:

an excavator main valve (600);

an attachment control valve group (400) for controlling an actuator of an attachment (300) and provided in an attachment hydraulic passage between the actuator and the excavator main valve (600); and

a pilot control valve group (500) at least for pilot control of the work attachment control valve group (400);

the excavator main valve (600), the working accessory control valve group (400) and the pilot control valve group (500) are all arranged on a main engine frame (100) or an excavator arm (200) of the excavator.

2. The hydraulic control system of an excavator according to claim 1, further comprising an excavator main controller, wherein the excavator main valve (600), the pilot valve group (500) and the plurality of work attachment control valve groups (400) are controlled by the excavator main controller.

3. The hydraulic control system of an excavator according to claim 1, wherein the pilot valve block (500) comprises a control oil inlet (P), a plurality of control oil outlets (a 1-a 6) and a plurality of electromagnetic directional valves arranged in parallel between the control oil inlet (P) and each of the control oil outlets (a 1-a 6), the control oil outlets (a 1-a 6) being at least partially piped to the respective controlling work implement control valve block (400).

4. The hydraulic control system of an excavator according to claim 3, further comprising a pilot control oil passage connected to the control oil inlet (P), in which a pilot solenoid valve and a pilot pump are provided in series.

5. The hydraulic control system of the excavator according to claim 3 or 4, wherein the actuator of the working accessory (300) includes a vibration motor (301), the excavator main valve (600) includes a main valve backup working port (B0) supplying oil to the vibration motor (301), the pilot control valve group (500) includes a first solenoid directional valve having a first control oil outlet (A1), the first control oil outlet (A1) is plumbed to the excavator main valve (600) and pilot controls the main valve backup working port (B0).

6. The hydraulic control system of the excavator of claim 5, wherein the pilot valve group (500) includes a second solenoid directional valve having a second control oil outlet (A2), the second control oil outlet (A2) being plumbed to the excavator main valve (600) and pilot-controlling the main valve backup working port (B0) in common with the first control oil outlet (A1).

7. The hydraulic control system of the excavator according to claim 6, wherein the actuator of the work attachment (300) includes a rotary motor (302), the work attachment control valve group (400) includes a rotary motor control valve group (401), the rotary motor control valve group (401) is provided in a rotary motor work oil path between the rotary motor (302) and a normally-open output port (P0) of the excavator main valve (600);

and the pilot control valve group (500) comprises a third electromagnetic directional valve with a third control oil outlet (A3) and a fourth electromagnetic directional valve with a fourth control oil outlet (A4), and the third control oil outlet (A3) and the fourth control oil outlet (A4) are respectively connected to control oil ports at two ends of the rotary motor control valve group (401) through pipelines.

8. The hydraulic control system of an excavator according to claim 7 wherein the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve and the fourth electromagnetic directional valve are proportional solenoid valves.

9. The hydraulic control system of the excavator according to claim 7, wherein an outlet end of the rotary motor control valve group (401) is connected with an overflow oil return path, and an overflow valve (2) and a check valve (3) are arranged on the overflow oil return path in parallel.

10. The hydraulic control system of the excavator according to claim 7, wherein the actuator of the working attachment (300) includes a clamp cylinder (303), the working attachment control valve group (400) includes a clamp cylinder control valve group (402), the clamp cylinder control valve group (402) is disposed in a clamp cylinder working oil path between the clamp cylinder and a normally open output port (P0) of the excavator main valve (600);

the pilot control valve group (500) comprises a fifth electromagnetic directional valve with a fifth control oil outlet (A5) and a sixth electromagnetic directional valve with a sixth control oil outlet (A6), and the fifth control oil outlet (A5) and the sixth control oil outlet (A6) are respectively connected to control oil ports at two ends of the clamping oil cylinder control valve group (402) through pipelines.

11. The hydraulic control system of the excavator according to claim 10, wherein the clamping cylinder control valve group (402) includes a pilot operated check valve (4) provided on the outlet end side.

12. The hydraulic control system of the excavator of claim 10 wherein the swing motor control valve block (401) and the clamp cylinder control valve block (402) each comprise a three-position, four-way reversing valve (1).

13. The hydraulic control system of the excavator according to claim 10, wherein the three-position four-way selector valve (1) is a pilot operated selector valve or a proportional solenoid valve;

and/or damping joints or throttle valves are arranged at oil inlets of the rotary motor control valve group (401) and the clamping oil cylinder control valve group (402);

and/or damping joints or throttle valves are arranged in pilot control oil passages between the first control oil outlet (A1) and the excavator main valve (600) and between the second control oil outlet (A2) and the excavator main valve (600).

14. The hydraulic control system of an excavator according to claim 1, wherein the working attachment (300) includes a bucket, a breaking hammer, a pile driver, a hydraulic shear, a crushing tong, an olecranon shear, a cart shear, a wood grabber, a stone grabber, a lotus grab, a crushing bucket, a tree mover, and a vibratory ram.

15. An excavator characterized in that the excavator comprises the hydraulic control system of the excavator according to any one of claims 1 to 14.