CN111962601A

CN111962601A - Auxiliary hydraulic system for machines and tools and excavator

Info

Publication number: CN111962601A
Application number: CN202010964041.8A
Authority: CN
Inventors: 秦小兵; 代宽宽
Original assignee: Shanghai Sany Heavy Machinery Co Ltd
Current assignee: Shanghai Sany Heavy Machinery Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-11-20

Abstract

The invention provides a machine auxiliary hydraulic system and an excavator, and relates to the technical field of excavating equipment, wherein the machine auxiliary hydraulic system comprises an oil supply device, a main valve, a reversing valve, a hammering and shearing device and a control device; the oil supply device is communicated with the main valve; the main valve is communicated with a rodless cavity of the hammer shear device through a first oil way, and is communicated with a rod cavity of the hammer shear device through a second oil way; the reversing valve is positioned on the second oil way and is directly communicated with the oil supply device; the oil supply device, the main valve and the reversing valve are all connected with the control device, and the control device is used for guiding pilot oil of the oil supply device to the main valve and the reversing valve so as to control the main valve and the reversing valve to reverse. The machine tool auxiliary hydraulic system provided by the invention realizes the reversing of the main valve and the reversing valve through the control device, can be quickly switched among various operation states, and realizes the hammer shear mode full electric control.

Description

Auxiliary hydraulic system for machines and tools and excavator

Technical Field

The invention relates to the technical field of excavating equipment, in particular to an auxiliary hydraulic system of a machine and an excavator.

Background

In the current engineering machinery, common operation forms of an excavator include excavation, crushing, hydraulic shear, grab bucket and the like, and the excavator is common in mine and municipal engineering working conditions.

The following problems exist in the actual operation: at present, most of domestic common hydraulic excavators mainly adopt bucket excavation, and a small part of customers install a breaking hammer; international customers in europe, the united states and the like have higher and higher installation requirements on multifunctional machines (such as breaking hammers, hydraulic shears, thumb clamps, grab buckets and the like) of the excavator and are in various types; at the moment, the hydraulic excavator needs to meet the use of various machines and tools as far as possible, and a hydraulic system and a hydraulic auxiliary system need to meet the requirements of pressure, flow and control modes of different machines and tools so that the hydraulic excavator can work normally.

Although the traditional hammer shear hydraulic auxiliary control system can realize the hammer shear function; however, the hammer shear mode is cumbersome to switch over to each other: the pressure needs to be manually adjusted again, and the three-way ball valve also needs to be manually reversed; in the breaking hammer mode, the oil return back pressure of a main oil way of the bidirectional auxiliary pipeline is high; under the hydraulic pressure mode of cutting: the pressure value of the opening and closing loop of the hydraulic shear needs to be manually adjusted according to the requirement.

Therefore, a hydraulic auxiliary system which can meet the requirements of different pressures, flow rates and control modes of the hydraulic shear of the breaking hammer is urgently needed.

Disclosure of Invention

The invention aims to provide a machine auxiliary hydraulic system which can be switched between various operation states quickly and realize full electric control of a hammer shear mode.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, the invention provides a machine auxiliary hydraulic system, which comprises an oil supply device, a main valve, a reversing valve, a hammer shear device and a control device, wherein the main valve is arranged on the main valve;

the oil supply device is communicated with the main valve;

the main valve is communicated with a rodless cavity of the hammer shear device through a first oil way, and is communicated with a rod cavity of the hammer shear device through a second oil way;

the reversing valve is positioned on the second oil way and is directly communicated with the oil supply device;

the oil supply device, the main valve and the reversing valve are all connected with the control device, and the control device is used for guiding pilot oil of the oil supply device to the main valve and the reversing valve so as to control the main valve and the reversing valve to reverse.

Furthermore, the auxiliary hydraulic system for the machine tool further comprises an overflow valve bank, the overflow valve bank is connected between the first oil way and the second oil way and directly communicated with the oil supply device, and the control device is connected with the overflow valve bank to adjust the overflow pressure of the overflow valve bank.

Further, the overflow valve group comprises an electromagnetic proportional overflow valve and a check valve group;

an oil inlet of the electromagnetic proportional overflow valve is communicated with the first oil way and the second oil way, and an overflow port of the electromagnetic proportional overflow valve is directly communicated with the oil supply device;

the check valve group is communicated with the first oil path, the second oil path and the oil inlet of the electromagnetic proportional overflow valve, so that hydraulic oil of the first oil path and the second oil path flows into the electromagnetic proportional overflow valve in a one-way mode.

Furthermore, the check valve group is also communicated with the oil supply device, so that hydraulic oil in the oil supply device flows into the first oil path and the second oil path in a single direction.

Further, the control device comprises an electric control module, and a pressure sensor and an electromagnetic valve group which are connected with the electric control module;

the electronic control module and the pressure sensor are both connected with the overflow valve group, the pressure sensor is used for detecting pressure information of hydraulic oil entering the overflow valve group, and the electronic control module is used for receiving the pressure information and adjusting the overflow pressure of the overflow valve group;

the oil supply device, the main valve and the reversing valve are all communicated with the electromagnetic valve group, and the electric control module is used for controlling the working state of the electromagnetic valve group so that the electromagnetic valve group guides the pilot oil of the oil supply device to the main valve or the reversing valve.

Further, the electromagnetic valve group comprises a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve which are connected with the electronic control module;

the reversing valve and the oil supply device are both communicated with the first electromagnetic valve;

one end of the main valve and the oil supply device are both communicated with the second electromagnetic valve;

the other end of the main valve and the oil supply device are communicated with the third electromagnetic valve.

Further, the electric control module comprises a controller, an electric handle and a display screen, wherein the electric handle, the display screen, the pressure sensor, the overflow valve group and the electromagnetic valve group are all connected with the controller.

Further, the oil supply device comprises an oil tank, a hydraulic pump and a pilot pump;

the reversing valve and the overflow valve group are both directly communicated with the oil tank;

the oil inlet of the hydraulic pump and the oil inlet of the pilot pump are communicated with the oil tank, the oil outlet of the hydraulic pump is communicated with the main valve, and the oil outlet of the pilot pump is communicated with the control device.

Furthermore, a first stop valve is arranged on the first oil path, a second stop valve is arranged on the second oil path, and the second stop valve is located between the reversing valve and the hammer shear device.

In a second aspect, the invention further provides an excavator, which comprises the implement auxiliary hydraulic system in the above scheme.

Taking a hammer shear mode of an excavator as an example, the auxiliary hydraulic system for the excavator provided by the invention has the following beneficial effects:

in the breaking hammer mode: high-pressure oil in the oil supply device firstly enters a main valve, meanwhile, a control device guides pilot oil of the oil supply device to the main valve to push the main valve to reverse, the high-pressure oil flows out of the main valve and enters a rodless cavity of the hammer shear device through a first oil way to carry out crushing operation of the excavator, and hydraulic oil in a rod cavity of the hammer shear device returns to the oil supply device through a reversing valve and a second oil way;

in the hydraulic shearing mode, the control device leads the pilot oil of the oil supply device to the reversing valve, the valve core of the reversing valve is reversed and switched into the hydraulic shearing mode, the high-pressure oil in the oil supply device firstly enters the main valve, at the moment, the control device leads the pilot oil of the oil supply device to the main valve and pushes the main valve to reverse, the high-pressure oil flows out of the main valve and enters a rodless cavity of the hammer shearing device through a first oil way to perform hydraulic shearing (clamping) operation, and the hydraulic oil of the rod cavity of the hammer shearing device returns to a second oil way through the reversing valve, enters the main valve and finally returns to an oil tank of the oil supply device;

when hydraulic pressure is cut (loosened), high pressure oil in the oil supply device enters the main valve, at the moment, the control device guides pilot oil of the oil supply device to the main valve to push the main valve to change direction, high pressure oil flows out of the main valve and enters the reversing valve through the second oil way, hydraulic oil flowing out of the reversing valve enters a rod cavity of the hammer shear device to carry out hydraulic pressure cutting (loosening) operation, and hydraulic oil in a rodless cavity of the hammer shear device enters the main valve through the first oil way and finally returns to an oil tank of the oil supply device.

Compared with the prior art, the machine tool auxiliary hydraulic system provided by the first aspect of the invention realizes the reversing of the main valve and the reversing valve through the control device, can be switched between various operation states quickly, and realizes the hammer shear mode full electric control.

The excavator according to the second aspect of the present invention has the implement auxiliary hydraulic system according to the first aspect of the present invention, thereby having all the advantages of the implement auxiliary hydraulic system according to the first aspect of the present invention.

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 description of the embodiments or 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 other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an oil circuit diagram of an implement auxiliary hydraulic system provided by the invention.

Icon: 1-an oil supply device; 11-a fuel tank; 12-a hydraulic pump; 13-a pilot pump; 2-a main valve; 3-a reversing valve; 4-hammer shear device; 5-a control device; 51-an electronic control module; 511-a controller; 512-electric handle; 513-display screen; 52-a pressure sensor; 53-solenoid valve group; 531-first solenoid valve; 532-second solenoid valve; 533-third solenoid valve; 6-first oil way; 7-a second oil path; 8-an overflow valve bank; 81-electromagnetic proportional relief valve; 82-a check valve set; 821-a first one-way valve; 822-a second one-way valve; 823-third check valve; 824-a fourth one-way valve; 9-a first stop valve; 10-second stop valve.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

An embodiment of the first aspect of the present invention is to provide a machine auxiliary hydraulic system, as shown in fig. 1, including an oil supply device 1, a main valve 2, a reversing valve 3, a hammer shear device 4 and a control device 5; the oil supply device 1 is communicated with the main valve 2; the main valve 2 is communicated with a rodless cavity of the hammer shear device 4 through a first oil way 6, and the main valve 2 is communicated with a rod cavity of the hammer shear device 4 through a second oil way 7; the reversing valve 3 is positioned on the second oil way 7 and is directly communicated with the oil supply device 1; the oil supply device 1, the main valve 2 and the reversing valve 3 are all connected with a control device 5, and the control device 5 is used for guiding pilot oil of the oil supply device 1 to the main valve 2 and the reversing valve 3 so as to control the main valve 2 and the reversing valve 3 to reverse.

The oil supply device 1 mainly plays a role in supplying oil, and meanwhile, return oil of the hammer shear device 4 can flow back to the oil supply device 1; a rod cavity and a rodless cavity of the hammer shear device 4 are respectively connected with the main valve 2, and the control device 5 controls the reversing of the main valve 2 to realize the switching between the hydraulic shearing (clamping) operation and the hydraulic shearing (loosening) operation; the reversing valve 3 is positioned on the second oil path 7, and the control device 5 controls the reversing of the reversing valve 3 to realize the switching between the breaking hammer mode and the hydraulic shearing (clamping) operation. The auxiliary hydraulic system of the machine tool solves the problem that hammer shear modes are switched from one to another in a complicated mode.

It should be noted that the above-mentioned implement auxiliary hydraulic system can also be used in other working implements of an excavator or in hydraulic systems of other mechanical products.

In some embodiments, the diverter valve 3 is a two-position, three-way diverter valve. The main valve 2 includes a main valve auxiliary spool, and the switching between the hydraulic shearing (clamping) operation and the hydraulic shearing (unclamping) operation is realized by the movement of the main valve auxiliary spool.

In some embodiments, as shown in fig. 1, the implement auxiliary hydraulic system further includes an overflow valve group 8, the overflow valve group 8 is connected between the first oil path 6 and the second oil path 7 and directly communicates with the oil supply device 1, and the control device 5 is connected with the overflow valve group 8 to adjust an overflow pressure of the overflow valve group 8.

When the oil pressure of the first oil path 6 or the second oil path 7 exceeds a preset value, hydraulic oil in the first oil path 6 and the second oil path 7 can overflow back to the oil supply device through the overflow valve group 8, the oil pressure of the system is guaranteed to be stable, especially in a breaking hammer mode, the overflow valve group 8 and the reversing valve 3 return oil synchronously, and the oil return back pressure is reduced.

The control device 5 can adjust the overflow pressure of the overflow valve group 8 according to different operation states of the machine tool so as to avoid overhigh oil pressure of an oil way and meet the pressure requirements of different brands of accessory tools.

Specifically, as shown in fig. 1, the relief valve group 8 includes an electromagnetic proportional relief valve 81 and a check valve group 82; an oil inlet of the electromagnetic proportional overflow valve 81 is communicated with the first oil path 6 and the second oil path 7, and an overflow port of the electromagnetic proportional overflow valve 81 is directly communicated with the oil supply device 1; the check valve group 82 is communicated with the first oil path 6, the second oil path 7 and the oil inlets of the electromagnetic proportional relief valve 81, so that the hydraulic oil of the first oil path 6 and the second oil path 7 flows into the electromagnetic proportional relief valve 81 in a single direction.

The control device 5 is directly and electrically connected with the electromagnetic proportional overflow valve 81 to control the overflow pressure of the electromagnetic proportional overflow valve 81; the check valve group 82 can ensure that the hydraulic oil of the first oil path 6 and the second oil path 7 flows into the oil inlet of the electromagnetic proportional overflow valve 81 in a one-way manner, so as to realize an overflow function.

As shown in fig. 1, the check valve group 82 includes a first check valve 821 and a second check valve 822, the first check valve 821 is located between the first oil path 6 and an oil inlet of the electromagnetic proportional relief valve 81, and the second check valve 822 is located between the second oil path 7 and an oil inlet of the electromagnetic proportional relief valve 81.

In some embodiments, the check valve group 82 also communicates with the oil supply device 1 so that the hydraulic oil in the oil supply device 1 flows into the first oil passage 6 and the second oil passage 7 in one direction. When the system is subjected to external force, the ultrahigh pressure of the oil circuit on one side of the electromagnetic proportional overflow valve 81 can overflow through the electromagnetic proportional overflow valve 81; the negative pressure generated by the oil circuit on the other side of the electromagnetic proportional overflow valve 81 can be supplemented from the oil supply device 1 through the check valve group 82, and the protection effect is achieved.

Specifically, as shown in fig. 1, the check valve group 82 further includes a third check valve 823 and a fourth check valve 824, the third check valve 823 is located between the second oil passage 7 and the overflow port of the electromagnetic proportional relief valve 81, and the fourth check valve 824 is located between the first oil passage 6 and the overflow port of the electromagnetic proportional relief valve 81. Because the overflow port of the electromagnetic proportional overflow valve 81 is directly communicated with the oil supply device 1, when a certain oil path is in a negative pressure state, hydraulic oil in the oil supply device 1 can enter the oil path through the third check valve 823 or the fourth check valve 824.

In some embodiments, as shown in fig. 1, the control device 5 comprises an electronic control module 51, and a pressure sensor 52 and a solenoid valve set 53 both connected to the electronic control module 51; the electric control module 51 and the pressure sensor 52 are both connected with the overflow valve group 8, the pressure sensor 52 is used for detecting pressure information of hydraulic oil entering the overflow valve group 8, the electric control module 51 is used for receiving the pressure information to judge flow required by the hydraulic shear, and the electric control module 51 is also used for adjusting overflow pressure of the overflow valve group 8; the oil supply device 1, the main valve 2 and the reversing valve 3 are all communicated with the electromagnetic valve group 53, and the electronic control module 51 is used for controlling the working state of the electromagnetic valve group 53, so that the electromagnetic valve group 53 guides the pilot oil of the oil supply device 1 to the main valve 2 or the reversing valve 3 to control the reversing of the main valve 2 and the reversing valve 3.

Specifically, as shown in fig. 1, the solenoid valve group 53 comprises a first solenoid valve 531, a second solenoid valve 532 and a third solenoid valve 533, all connected to the electronic control module 51; the reversing valve 3 and the oil supply device 1 are both communicated with a first electromagnetic valve 531; one end of the main valve 2 and the oil supply device 1 are both communicated with the second solenoid valve 532; the other end of the main valve 2 and the oil supply device 1 are both communicated with the third solenoid valve 533. The electronic control module 51 controls the flow of pilot oil of the oil supply device 1 to the selector valve 3 or the main valve 2 by controlling the energization states of the first solenoid valve 531, the second solenoid valve 532, and the third solenoid valve 533.

In addition, as shown in fig. 1, the electronic control module 51 includes a controller 511, an electric handle 512 and a display 513, and the electric handle 512, the display 513, the pressure sensor 52, the overflow valve group 8 and the solenoid valve group 53 are all connected to the controller 511.

The display screen 513 can be provided with a quick switching button for a breaking hammer mode and a hydraulic shear mode, and has a detailed parameter setting function, signals are output to the overflow valve group 8, the electromagnetic valve group 53 and other related control elements through the controller 511, and meanwhile, the controller 511 can receive control signals of the electric handle 512 and pressure information transmitted by the pressure sensor 52, and realize each action of the machine tool according to the control signals.

Specifically, the controller 511 is a PWM (Pulse Width Modulation) controller.

The electric handle 512 is mainly used for controlling the excavating action of the excavator, in this embodiment, a signal is transmitted to the controller 511 by controlling a lateral proportional amount sliding key which can slide left and right on the electric handle 512, and the controller 511 outputs a command to implement the excavator action (for example, implement the hydraulic shear opening and closing action) according to the signal magnitude. The upper part of the electric handle 512 is also provided with two switching value button keys, the back part of the electric handle is provided with a three-position rocker switch, the button and the rocker switch can transmit the on-off of a 24V voltage signal to the controller 511, and the controller 511 outputs a command signal according to the on-off of the signal, so that the related functions (such as a horn) and the action of the excavator are controlled.

In some embodiments, as shown in fig. 1, the oil supply device 1 includes an oil tank 11, a hydraulic pump 12, and a pilot pump 13; the reversing valve 3 and the overflow valve group 8 are both directly communicated with an oil tank 11; an oil inlet of the hydraulic pump 12 and an oil inlet of the pilot pump 13 are both communicated with the oil tank 11, an oil outlet of the hydraulic pump 12 is communicated with the main valve 2, and an oil outlet of the pilot pump 13 is communicated with the control device 5.

Specifically, when the oil tank 11 supplies oil to the hydraulic pump 12 and the pilot pump 13, the electronic control module 51 may control the flow of the pilot oil from the pilot pump 13 to the directional valve 3 or the main valve 2 by controlling the energization states of the first solenoid valve 531, the second solenoid valve 532, and the third solenoid valve 533.

In at least one embodiment, the electronic control module 51 is electrically connected to the hydraulic pump 12, and the electronic control module 51 determines the flow rate required by the operation of the hammer shear device 4 according to the magnitude of the pressure information transmitted by the pressure sensor 52, so as to control the displacement of the hydraulic pump 12 and realize participation in overall machine control and engine power matching.

In some embodiments, the first cut-off valve 9 is disposed on the first oil path 6, and the second cut-off valve 10 is disposed on the second oil path 7, and the second cut-off valve 10 is located between the reversing valve 3 and the hammer shear device 4. When the accessory is replaced, the first stop valve 9 and the second stop valve 10 can be closed to play a protection role.

The following describes the working process of the implement auxiliary hydraulic system in detail, taking the hammer shear mode of the excavator as an example:

breaking hammer mode:

firstly, pressing a breaking hammer mode button on a display screen 513, and firstly enabling high-pressure oil pumped by a hydraulic pump 12 from an oil tank to flow into a main valve 2; at this time, the hammer button of the electric handle 512 is pressed, the electric signal is transmitted to the controller 511, the controller 511 sends a switching signal to the second electromagnetic valve 532, and the pilot oil flowing out of the pilot pump 13 enters the main valve standby spool XAo end of the main valve 2 (as shown in fig. 1, the end XAo is the right end of the main valve standby spool) to push the main valve standby spool to reverse to the left; high-pressure oil enters a first oil way from a main valve 2, passes through an oil inlet B and an oil outlet A of an overflow valve group 8, then enters a first stop valve 9 and finally enters a rodless cavity of a hammer shear device 4 (a breaking hammer at the moment) to perform the breaking operation of the excavator as shown in figure 1; meanwhile, a rod cavity of the hammer shear device 4 is an oil return path, and the oil level is from the second stop valve 10 to the upper part of the reversing valve 3 and directly returns to the oil tank 11 through the second oil path 7;

at this time, the controller 511 sets the relief pressure of the electromagnetic proportional relief valve 81 to 21 MPa;

if impact overload causes the system pressure to exceed 21MPa, the overflow valve group 8 is instantly opened (at this time, the first check valve 821 is opened, and the second check valve 822, the third check valve 823 and the fourth check valve 824 are closed) until the pressure is reduced to 21MPa, and the overflow hydraulic oil is closed again, and the overflow hydraulic oil flows back to the oil tank 11;

hydraulic shear mode:

when the hydraulic shear mode button on the display 513 is pressed first, the controller 511 sends a switching signal to the first solenoid valve 531, and the pilot oil flowing out of the pilot pump 13 enters the lower end of the reversing valve 3 to push the spool of the reversing valve to reverse.

Specifically, when the hydraulic shear is in clamping operation:

the high-pressure oil pumped by the hydraulic pump 12 from the oil tank firstly flows into the main valve 2, at this time, the electric handle 512 slides and moves the key leftwards, the controller 511 sends a switching signal to the second electromagnetic valve 532, and the pilot oil flowing out of the pilot pump 13 enters the main valve backup valve core XAo end of the main valve 2 (as shown in fig. 1, the end XAo is the right end of the main valve backup valve core), so as to push the main valve backup valve core to change direction leftwards; high-pressure oil enters a first oil way 6 from a main valve 2, passes through an oil inlet B and an oil outlet A of an overflow valve group 8, then enters a first stop valve 9 and finally enters a rodless cavity of a hammer shear device 4 to perform hydraulic shearing (clamping) operation as shown in figure 1; meanwhile, a rod cavity of the hammer shear device 4 is used for returning oil, the oil level reaches the lower part of the reversing valve 3 through the second stop valve 10, and finally returns to the oil tank 11 through the second oil path 7 and the main valve 2;

at this time, the controller 511 calibrates the relief pressure of the electromagnetic proportional relief valve 81 to 34.3 MPa;

if impact overload causes the system pressure to exceed 34.3MPa, the overflow valve group 8 is opened instantly (at this time, the first check valve 821 is opened, and the second check valve 822, the third check valve 823 and the fourth check valve 824 are closed) until the pressure is reduced to 34.3MPa, and then the overflow hydraulic oil is closed again, and the overflow hydraulic oil flows back to the oil tank 11;

specifically, the hydraulic shear loosening operation:

the high-pressure oil pumped by the hydraulic pump 12 from the oil tank firstly flows into the main valve 2, at this time, the electric handle 512 slides to the right, the controller 511 sends a switching signal to the third electromagnetic valve 533, and the pilot oil flowing out of the pilot pump 13 enters the main valve backup spool XBo end of the main valve 2 (as shown in fig. 1, the XBo end is the left end of the main valve backup spool) to push the main valve backup spool to change direction to the right; high-pressure oil enters a second oil way 7 from a main valve 2, flows into a reversing valve 3 through the second oil way 7, flows into a second stop valve 10 through the oil level at the lower part of the reversing valve, and finally reaches a rod cavity of a hammer shearing device 4 to perform hydraulic shearing (loosening) operation; meanwhile, a rodless cavity of the hammer shear device 4 is an oil return path, and as shown in fig. 1, the oil return path enters an oil port a of the overflow valve group 8 after passing through the first stop valve 9, flows out of an oil port B of the overflow valve group 8 to the first oil path 6, and finally returns to the oil tank 11;

if the system pressure exceeds 34.3MPa due to impact overload, the overflow valve group 8 is opened instantly (at this time, the first check valve 821 is opened, and the second check valve 822, the third check valve 823 and the fourth check valve 824 are closed) until the pressure is reduced to 34.3MPa, and then the overflow hydraulic oil is closed again, and the overflow hydraulic oil flows back to the oil tank 11.

In the above three operation states, the controller 511 determines the flow rate required by the operation of the hammer according to the value of the pressure information detected and transmitted by the pressure sensor 52, so as to control the displacement of the hydraulic pump 12, thereby realizing participation in the overall machine control and the engine power matching.

Meanwhile, when the system is subjected to external force, the ultrahigh pressure of the oil circuit on one side of the electromagnetic proportional overflow valve 81 can overflow through the electromagnetic proportional overflow valve 81; the negative pressure generated by the oil circuit on the other side of the electromagnetic proportional overflow valve 81 can be supplemented from the oil supply device 1 through the check valve group 82, and the protection effect is achieved.

An embodiment of the second aspect of the present invention provides an excavator, which includes the above implement auxiliary hydraulic system.

Embodiments of the second aspect of the present invention provide an excavator having an implement assist hydraulic system as provided by embodiments of the first aspect of the present invention, thereby having all the benefits of the implement assist hydraulic system as provided by embodiments of the first aspect of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The auxiliary hydraulic system of the machine is characterized by comprising an oil supply device (1), a main valve (2), a reversing valve (3), a hammering and shearing device (4) and a control device (5);

the oil supply device (1) is communicated with the main valve (2);

the main valve (2) is communicated with a rodless cavity of the hammer shear device (4) through a first oil way (6), and the main valve (2) is communicated with a rod cavity of the hammer shear device (4) through a second oil way (7);

the reversing valve (3) is positioned on the second oil way (7) and is directly communicated with the oil supply device (1);

the oil supply device (1), the main valve (2) and the reversing valve (3) are all connected with the control device (5), and the control device (5) is used for guiding pilot oil of the oil supply device (1) to the main valve (2) and the reversing valve (3) so as to control the main valve (2) and the reversing valve (3) to reverse.

2. Implement auxiliary hydraulic system according to claim 1, characterized in that it further comprises an overflow valve group (8), said overflow valve group (8) being connected between said first oil circuit (6) and said second oil circuit (7) and being in direct communication with said oil supply device (1), said control device (5) being connected with said overflow valve group (8) to adjust the overflow pressure of said overflow valve group (8).

3. Implement auxiliary hydraulic system according to claim 2, characterized in that the overflow valve group (8) comprises an electromagnetic proportional overflow valve (81) and a check valve group (82);

an oil inlet of the electromagnetic proportional overflow valve (81) is communicated with the first oil path (6) and the second oil path (7), and an overflow port of the electromagnetic proportional overflow valve (81) is directly communicated with the oil supply device (1);

the check valve group (82) is communicated with oil inlets of the first oil path (6), the second oil path (7) and the electromagnetic proportional overflow valve (81), so that hydraulic oil of the first oil path (6) and the second oil path (7) flows into the electromagnetic proportional overflow valve (81) in a one-way mode.

4. An implement auxiliary hydraulic system according to claim 3, characterized in that the check valve group (82) is also in communication with the oil supply device (1) so that hydraulic oil in the oil supply device (1) flows into the first oil passage (6) and the second oil passage (7) in one direction.

5. Implement auxiliary hydraulic system according to claim 2, characterized in that the control device (5) comprises an electronic control module (51) and a pressure sensor (52) and a solenoid valve block (53) both connected to the electronic control module (51);

the electronic control module (51) and the pressure sensor (52) are both connected with the overflow valve group (8), the pressure sensor (52) is used for detecting pressure information of hydraulic oil entering the overflow valve group (8), and the electronic control module (51) is used for receiving the pressure information and adjusting the overflow pressure of the overflow valve group (8);

the oil supply device (1), the main valve (2) and the reversing valve (3) are all communicated with the electromagnetic valve group (53), and the electronic control module (51) is used for controlling the working state of the electromagnetic valve group (53) so that the electromagnetic valve group (53) guides pilot oil of the oil supply device (1) to the main valve (2) or the reversing valve (3).

6. The implement auxiliary hydraulic system according to claim 5, characterized in that the solenoid valve group (53) comprises a first solenoid valve (531), a second solenoid valve (532) and a third solenoid valve (533) all connected to the electronic control module (51);

the reversing valve (3) and the oil supply device (1) are both communicated with the first electromagnetic valve (531);

one end of the main valve (2) and the oil supply device (1) are communicated with the second electromagnetic valve (532);

the other end of the main valve (2) and the oil supply device (1) are communicated with the third electromagnetic valve (533).

7. Implement auxiliary hydraulic system according to claim 5, characterized in that the electronic control module (51) comprises a controller (511), an electric handle (512) and a display screen (513), the electric handle (512), the display screen (513), the pressure sensor (52), the overflow valve block (8) and the solenoid valve block (53) being connected to the controller (511).

8. Implement auxiliary hydraulic system according to claim 2, characterized in that the oil supply device (1) comprises an oil tank (11), a hydraulic pump (12) and a pilot pump (13);

the reversing valve (3) and the overflow valve group (8) are both directly communicated with the oil tank (11);

the oil inlet of the hydraulic pump (12) and the oil inlet of the pilot pump (13) are communicated with the oil tank (11), the oil outlet of the hydraulic pump (12) is communicated with the main valve (2), and the oil outlet of the pilot pump (13) is communicated with the control device (5).

9. The implement auxiliary hydraulic system according to claim 1, characterized in that a first stop valve (9) is arranged on the first oil path (6), a second stop valve (10) is arranged on the second oil path (7), and the second stop valve (10) is located between the reversing valve (3) and the hammer shear device (4).

10. An excavator comprising an implement auxiliary hydraulic system as claimed in any one of claims 1 to 9.