CN211113859U

CN211113859U - Generic tool confluence hydraulic system and excavator

Info

Publication number: CN211113859U
Application number: CN201922056637.3U
Authority: CN
Inventors: 刘启明; 薛晓昕; 尹满义; 郭文博; 程义鹏
Original assignee: Sany Heavy Machinery Ltd
Current assignee: Sany Heavy Machinery Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-28
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a kind utensil confluence hydraulic system and excavator relates to excavator technical field. The accessory confluence hydraulic system comprises an oil tank, a first oil pump, a second oil pump, an accessory multi-way valve, a walking multi-way valve, a reversing valve and a working accessory. The first oil pump and the second oil pump are both connected with the oil tank, the first oil pump is connected with a working accessory through an accessory multi-way valve, an accessory control oil duct is arranged between the accessory multi-way valve and the working accessory, the second oil pump is connected with a reversing valve through a walking multi-way valve, the reversing valve is connected with the accessory control oil duct, and the second oil pump can pump hydraulic oil into the accessory control oil duct to achieve confluence control of the working accessory. Compared with the prior art, the utility model provides an accessory confluence hydraulic system can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to do not be equipped with actuating mechanism between second oil pump and the work accessory, guarantee that confluence control is reliable and stable.

Description

Generic tool confluence hydraulic system and excavator

Technical Field

The utility model relates to an excavator technical field particularly, relates to a kind utensil confluence hydraulic system and excavator.

Background

In the related art, joint flow control of attachments in hydraulic excavators is generally performed by a shut-off valve inside a main valve. Generally, the main pump controls the action of the accessory, and the cut-off valve cuts off an oil path between the auxiliary pump and the accessory; when confluence is needed, the stop valve is opened, the main pump and the slave pump supply oil to the accessory together, and confluence control is realized.

However, the existing control mode has the following problems: 1. the shut-off valve is arranged in the main valve, so that the pressure loss in the main valve is too large, the system pressure is increased, and the confluence effect is limited; 2. the main valve structure is a series structure, a plurality of actuating mechanisms are arranged between the slave pump and the stop valve, the stop valve is arranged at the last linkage, if the stop valve and other actuating mechanisms operate simultaneously, hydraulic oil is preferentially supplied to the front actuating mechanism, and confluence cannot be achieved.

In view of the above, it is important to design and manufacture an attachment confluence hydraulic system and an excavator capable of stably converging, especially in excavator production.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a kind of utensil confluence hydraulic system, simple structure can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to do not be equipped with actuating mechanism between follow pump and the accessory, guarantee that confluence control is reliable and stable.

Another object of the utility model is to provide an excavator, the accessory confluence hydraulic system simple structure in it can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to do not be equipped with actuating mechanism between slave pump and the accessory, guarantee that confluence control is reliable and stable.

The utility model is realized by adopting the following technical scheme.

The utility model provides a belong to utensil confluence hydraulic system, including the oil tank, first oil pump, second oil pump, accessory multiple unit valve, walking multiple unit valve, switching-over valve and work accessory, first oil pump and second oil pump all are connected with the oil tank, and first oil pump passes through accessory multiple unit valve and is connected with the work accessory, has accessory control oil duct between accessory multiple unit valve and the work accessory, and the second oil pump passes through walking multiple unit valve and is connected with the switching-over valve, and the switching-over valve is connected with accessory control oil duct, and the second oil pump can be with hydraulic oil suction accessory control oil duct to realize the confluence control to the work accessory.

Furthermore, the accessory multi-way valve comprises an accessory valve core and an accessory valve body, the accessory valve body is provided with a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, the first oil inlet and the second oil inlet are both connected with a first oil pump, the first oil outlet is connected with a working accessory, the second oil outlet is connected with an oil return tank, the accessory valve core is movably installed in the accessory valve body, and the accessory valve core can be used for conducting the first oil inlet and the first oil outlet or conducting the second oil inlet and the second oil outlet.

Further, the reversing valve comprises a reversing valve core and a reversing valve body, the reversing valve body is provided with a third oil inlet, a third oil outlet and a fourth oil outlet, the third oil inlet is connected with the second oil pump through the walking multi-way valve, the third oil outlet is connected with the accessory control oil duct, the fourth oil outlet is connected with the oil tank through the walking multi-way valve, the reversing valve core is movably installed in the reversing valve body, and the reversing valve core can be used for conducting the third oil inlet and the third oil outlet or conducting the third oil inlet and the fourth oil outlet.

Furthermore, the accessory confluence hydraulic system further comprises a one-way valve, the one-way valve is connected between the third oil outlet and the accessory control oil passage, and the one-way valve is used for preventing hydraulic oil in the accessory control oil passage from flowing back to the third oil outlet.

Furthermore, the accessory confluence hydraulic system also comprises a hydraulic motor, and the hydraulic motor is connected between the fourth oil outlet and the walking multi-way valve.

Furthermore, the accessory confluence hydraulic system also comprises a manual valve, the manual valve is connected with the oil tank, the manual valve is respectively connected with the accessory valve core and the reversing valve core, the manual valve can drive the accessory valve core to move in the accessory valve body, and the manual valve can also drive the reversing valve core to move in the reversing valve body.

Furthermore, the accessory confluence hydraulic system further comprises a transposition control oil duct, the transposition control oil duct comprises a main oil duct and two branch oil ducts which are connected with each other, the main oil duct is connected with the manual valve, one branch oil duct is connected with the accessory valve core, and the other branch oil duct is connected with the reversing valve core.

Furthermore, the walking multi-way valve comprises a walking valve core and a walking valve body, the walking valve body is provided with a fourth oil inlet, a fifth oil outlet and a sixth oil outlet, the fourth oil inlet and the fifth oil inlet are both connected with a second oil pump, the fifth oil outlet is connected with a reversing valve, the sixth oil outlet is connected with an oil return tank, the walking valve core is movably installed in the walking valve body, and the walking valve core can conduct the fourth oil inlet and the fifth oil outlet or conduct the fifth oil inlet and the sixth oil outlet.

Furthermore, the accessory confluence hydraulic system also comprises a foot valve, the foot valve is connected with the oil tank, the foot valve is connected with the traveling valve core, and the foot valve can drive the traveling valve core to move in the traveling valve body.

An excavator comprises the accessory confluence hydraulic system, wherein the accessory confluence hydraulic system comprises an oil tank, a first oil pump, a second oil pump, an accessory multi-way valve, a walking multi-way valve, a reversing valve and a working accessory, the first oil pump and the second oil pump are both connected with the oil tank, the first oil pump is connected with the working accessory through the accessory multi-way valve, an accessory control oil duct is arranged between the accessory multi-way valve and the working accessory, the second oil pump is connected with the reversing valve through the walking multi-way valve, the reversing valve is connected with the accessory control oil duct, and the second oil pump can pump hydraulic oil into the accessory control oil duct to realize confluence control on the working accessory.

The utility model provides an accessory confluence hydraulic system and excavator have following beneficial effect:

the utility model provides an accessory confluence hydraulic system, first oil pump and second oil pump all are connected with the oil tank, and first oil pump passes through the accessory multi-way valve and is connected with the work accessory, has accessory control oil duct between accessory multi-way valve and the work accessory, and the second oil pump is connected with the switching-over valve through walking multi-way valve, and the switching-over valve is connected with accessory control oil duct, and the second oil pump can be with hydraulic oil suction accessory control oil duct to the realization is to the confluence control of work accessory. Compared with the prior art, the utility model provides an accessory confluence hydraulic system is owing to adopted the switching-over valve of being connected with accessory control oil duct and the direct second oil pump of being connected with the walking multiple unit valve, so can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to do not be equipped with actuating mechanism between second oil pump and the work accessory, guarantee that confluence control is reliable and stable.

The utility model provides an excavator, accessory confluence hydraulic system simple structure in it can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to do not be equipped with actuating mechanism between second oil pump and the work accessory, guarantee that confluence control is reliable and stable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an accessory confluence hydraulic system provided by an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an accessory multi-way valve in an accessory confluence hydraulic system according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a reversing valve in an accessory confluence hydraulic system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a travel multi-way valve in an accessory confluence hydraulic system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the accessory confluence hydraulic system provided in the embodiment of the present invention in a first working state;

fig. 6 is a schematic structural diagram of the accessory confluence hydraulic system provided in the embodiment of the present invention in a second working state;

fig. 7 is a schematic structural diagram of the accessory confluence hydraulic system provided in the embodiment of the present invention in a third operating state.

Icon: 100-accessory confluence hydraulic system; 110-a fuel tank; 120-a first oil pump; 130-a second oil pump; 140-accessory multi-way valve; 141-accessory valve core; 142-an accessory valve body; 143-a first oil inlet; 144-a second oil inlet; 145-a first oil outlet; 146-a second oil outlet; 150-a walking multi-way valve; 151-a travel spool; 152-a walking valve body; 153-a fourth oil inlet; 154-fifth oil inlet; 155-fifth oil outlet; 156-a sixth oil outlet; 160-a reversing valve; 161-a diverter valve cartridge; 162-a diverter valve body; 163-third oil inlet; 164-a third oil outlet; 165-a fourth oil outlet; 170-working accessory; 180-a one-way valve; 190-a hydraulic motor; 200-manual valve; 210-transposition control oil passage; 211 — main oil gallery; 212-branch oil gallery; 220-an oil return tank; 230-a foot valve; 240-accessory control oil duct.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are conventionally placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, e.g., as meaning 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.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

Examples

Referring to fig. 1, an embodiment of the present invention provides an excavator (not shown) for performing an excavating operation. The accessory confluence hydraulic system 100 is simple in structure, can realize valve confluence, is small in system pressure loss and good in confluence effect, and ensures stable and reliable confluence control because an actuating mechanism is not arranged between the slave pump and the accessories. In the present embodiment, the excavator includes a machine body (not shown) and an attachment confluence hydraulic system 100, the attachment confluence hydraulic system 100 being installed in the machine body, and the attachment confluence hydraulic system 100 being used for hydraulic control.

The accessory confluence hydraulic system 100 includes an oil tank 110, a first oil pump 120, a second oil pump 130, an accessory multi-way valve 140, a walking multi-way valve 150, a reversing valve 160, a working accessory 170, a check valve 180, a hydraulic motor 190, a manual valve 200, a transposition control oil passage 210, an oil return tank 220 and a foot valve 230. The first oil pump 120 and the second oil pump 130 are both connected to the oil tank 110, the oil tank 110 is used for storing hydraulic oil, and the first oil pump 120 and the second oil pump 130 are both capable of pumping out the hydraulic oil in the oil tank 110. The first oil pump 120 is connected to the working attachment 170 through the attachment multi-way valve 140, an attachment control oil passage 240 is provided between the attachment multi-way valve 140 and the working attachment 170, and the first oil pump 120 can pump hydraulic oil into the attachment control oil passage 240 through the attachment multi-way valve 140 and then input into the working attachment 170 to control the operation of the working attachment 170. The second oil pump 130 is connected to the directional valve 160 through the walking multi-way valve 150, the directional valve 160 is connected to the accessory control oil passage 240, and the second oil pump 130 can pump hydraulic oil into the accessory control oil passage 240 through the walking multi-way valve 150 and the directional valve 160, so as to increase the flow rate of the hydraulic oil in the accessory control oil passage 240, and implement confluence control of the working accessory 170.

It should be noted that the check valve 180 is connected between the direction switching valve 160 and the accessory control gallery 240 to prevent the hydraulic oil in the accessory control gallery 240 from flowing back to the direction switching valve 160. The hydraulic motor 190 is connected between the reversing valve 160 and the walking multi-way valve 150, and the hydraulic motor 190 is used for driving the machine body to walk. The manual valve 200 is connected to the direction valve 160 and the accessory multi-way valve 140 through a shift control oil passage 210, respectively, to control the direction valve 160 and the accessory multi-way valve 140 to shift valve positions. The foot valve 230 is connected to the travel multiplex valve 150 to control the travel multiplex valve 150 to change valve positions. The attachment multi-way valve 140 and the travel multi-way valve 150 are connected to an oil return tank 220 to return oil when the attachment is not operated.

In this embodiment, the first oil pump 120, the second oil pump 130, the accessory multi-way valve 140, and the travel multi-way valve 150 are combined to form a main valve (not shown), the directional valve 160 is disposed outside the main valve, and an external main valve pipeline is connected to the working accessory 170 through the directional valve 160, so that the valve external confluence is achieved, the pressure loss inside the main valve is reduced, and the confluence effect is good. The second oil pump 130 is directly connected to the switching valve 160 through the travel multi-way valve 150, and there is no actuator therebetween, so that the merging control is performed in the first order, and smooth merging is ensured.

Referring to fig. 2, the accessory multi-way valve 140 includes an accessory valve core 141 and an accessory valve body 142. The attachment valve body 142 is provided with a first oil inlet 143, a second oil inlet 144, a first oil outlet 145 and a second oil outlet 146, wherein the first oil inlet 143 is communicated with the first oil outlet 145, and the second oil inlet 144 is communicated with the second oil outlet 146. The first oil inlet 143 and the second oil inlet 144 are both connected to the first oil pump 120, and the first oil pump 120 can pump hydraulic oil into the first oil inlet 143 or the second oil inlet 144. The first oil outlet 145 is connected to the working attachment 170, the attachment control oil passage 240 is provided between the first oil outlet 145 and the working attachment 170, and the second oil outlet 146 is connected to the return oil tank 220. The accessory valve core 141 is movably installed in the accessory valve body 142, and the accessory valve core 141 can communicate the first oil inlet 143 with the first oil outlet 145, or communicate the second oil inlet 144 with the second oil outlet 146.

Specifically, when the accessory valve core 141 moves to a position between the second oil inlet 144 and the second oil outlet 146, the second oil inlet 144 and the second oil outlet 146 are blocked, at this time, the first oil inlet 143 is communicated with the first oil outlet 145, and the hydraulic oil enters the working accessory 170 under the driving of the first oil pump 120; when the accessory valve core 141 moves to a position between the first oil inlet 143 and the first oil outlet 145, the first oil inlet 143 and the first oil outlet 145 are blocked, at this time, the second oil inlet 144 and the second oil outlet 146 are communicated, and the hydraulic oil enters the return oil tank 220 under the driving of the first oil pump 120.

Referring to fig. 3, the direction valve 160 includes a direction valve spool 161 and a direction valve body 162. The reversing valve body 162 is provided with a third oil inlet 163, a third oil outlet 164 and a fourth oil outlet 165, wherein the third oil inlet 163 is respectively communicated with the third oil outlet 164 and the fourth oil outlet 165. The third oil inlet 163 is connected to the second oil pump 130 through the travel multi-way valve 150, the third oil outlet 164 is connected to the accessory control oil passage 240, and the fourth oil outlet 165 is connected to the oil tank 110 through the travel multi-way valve 150. The direction valve core 161 is movably installed in the direction valve body 162, and the direction valve core 161 can connect the third oil inlet 163 and the third oil outlet 164, or connect the third oil inlet 163 and the fourth oil outlet 165.

Specifically, when the reversing valve element 161 moves to a position between the third oil inlet 163 and the fourth oil outlet 165, the third oil inlet 163 and the fourth oil outlet 165 are separated, at this time, the third oil inlet 163 and the third oil outlet 164 are communicated, and the hydraulic oil is driven by the second oil pump 130 to enter the accessory control oil passage 240; when the reversing valve spool 161 moves between the third oil inlet 163 and the third oil outlet 164, the third oil inlet 163 and the third oil outlet 164 are blocked, at this time, the third oil inlet 163 and the fourth oil outlet 165 are communicated, and hydraulic oil enters the oil tank 110 under the driving of the hydraulic motor 190.

It should be noted that the check valve 180 is connected between the third oil outlet 164 and the accessory control oil passage 240, and the check valve 180 is used for preventing the hydraulic oil in the accessory control oil passage 240 from flowing back to the third oil outlet 164. The hydraulic motor 190 is connected between the fourth oil outlet 165 and the travel multi-way valve 150, and the hydraulic motor 190 is used for driving the hydraulic oil to return to the oil tank 110 through the travel multi-way valve 150.

Referring to fig. 1, it is noted that the manual valve 200 is connected to the oil tank 110, the manual valve 200 is connected to the accessory valve core 141 and the direction-changing valve core 161 through the shift control oil passage 210, the manual valve 200 can drive the accessory valve core 141 to move in the accessory valve body 142 to adjust and control the valve position of the accessory multi-way valve 140, and the manual valve 200 can drive the direction-changing valve core 161 to move in the direction-changing valve body 162 to adjust and control the valve position of the direction-changing valve 160. Specifically, the transposition control oil passage 210 includes a main oil passage 211 and two branch oil passages 212 connected to each other, the main oil passage 211 is connected to the manual valve 200, one branch oil passage 212 is connected to the accessory valve spool 141, and the other branch oil passage 212 is connected to the direction change valve spool 161. In this embodiment, the manual valve 200 can control the accessory valve element 141 and the direction switching valve element 161 at the same time, that is, the direction switching valve element 161 moves while the accessory valve element 141 moves.

Referring to fig. 4, the travel multi-way valve 150 includes a travel valve spool 151 and a travel valve body 152. The traveling valve body 152 is provided with a fourth oil inlet 153, a fifth oil inlet 154, a fifth oil outlet 155 and a sixth oil outlet 156, wherein the fourth oil inlet 153 is communicated with the fifth oil outlet 155, and the fifth oil inlet 154 is communicated with the sixth oil outlet 156. The fourth oil inlet 153 and the fifth oil inlet 154 are both connected to the second oil pump 130, and the second oil pump 130 can pump hydraulic oil into the fourth oil inlet 153 or the fifth oil inlet 154. The fifth oil outlet 155 is connected with the reversing valve 160, and the sixth oil outlet 156 is connected with the return oil tank 220. The traveling valve core 151 is movably installed in the traveling valve body 152, and the traveling valve core 151 can communicate the fourth oil inlet 153 and the fifth oil outlet 155, or communicate the fifth oil inlet 154 and the sixth oil outlet 156.

Specifically, when the traveling valve core 151 moves to a position between the fifth oil inlet 154 and the sixth oil outlet 156, the fifth oil inlet 154 and the sixth oil outlet 156 are blocked, at this time, the fourth oil inlet 153 and the fifth oil outlet 155 are communicated, and the hydraulic oil enters the third oil inlet 163 of the reversing valve 160 under the driving of the second oil pump 130; when the traveling valve core 151 moves to a position between the fourth oil inlet 153 and the fifth oil outlet 155, the fourth oil inlet 153 and the fifth oil outlet 155 are blocked, at this time, the fifth oil inlet 154 is communicated with the sixth oil outlet 156, and the hydraulic oil enters the return oil tank 220 under the driving of the second oil pump 130.

It should be noted that the foot valve 230 is connected to the oil tank 110, the foot valve 230 is connected to the travel valve core 151, and the foot valve 230 can drive the travel valve core 151 to move in the travel valve body 152 to control the valve position of the travel multi-way valve 150.

Referring to fig. 5, 6, and 7 (the hollow arrows in fig. 5, 6, and 7 indicate the flow direction of the hydraulic oil), it should be noted that, during the operation of the joint hydraulic system 100, there are three operating states, namely, a first operating state, a second operating state, and a third operating state.

When the tool confluence hydraulic system 100 is in the first working state, the machine body normally works, but the working tool 170 is not operated. In the process, the first oil pump 120 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the return oil tank 220 through the second oil inlet 144 and the second oil outlet 146 of the accessory multi-way valve 140; the second oil pump 130 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the return oil tank 220 through the fifth oil inlet 154 and the sixth oil outlet 156 of the travel multi-way valve 150.

When the tool-joining hydraulic system 100 is in the second operating state, the normal operation of the working tool 170 is performed without joining. The positions of the accessory multi-way valve 140 and the reversing valve 160 are adjusted by the manual valve 200. In the process, the first oil pump 120 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the working attachment 170 through the first oil inlet 143 and the first oil outlet 145 of the attachment multi-way valve 140, and forms an attachment control oil passage 240; the second oil pump 130 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the return oil tank 220 through the fifth oil inlet 154 and the sixth oil outlet 156 of the travel multi-way valve 150.

When the tool confluence hydraulic system 100 is in the third operating state, confluence control of the working tools 170 is performed so that the working tools 170 operate at a large flow rate. At this time, the positions of the accessory multi-way valve 140 and the direction switching valve 160 are adjusted by the manual valve 200, and the position of the travel multi-way valve 150 is adjusted by the foot valve 230. In the process, the first oil pump 120 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the working attachment 170 through the first oil inlet 143 and the first oil outlet 145 of the attachment multi-way valve 140, and forms an attachment control oil passage 240; the second oil pump 130 pumps out the hydraulic oil in the oil tank 110, and the hydraulic oil enters the third oil inlet 163 of the directional control valve 160 through the fourth oil inlet 153 and the fifth oil outlet 155 of the travel multi-way valve 150, and then enters the accessory control oil passage 240 through the third oil outlet 164 of the directional control valve 160, so that confluence is achieved.

The embodiment of the utility model provides an accessory confluence hydraulic system 100, first oil pump 120 and second oil pump 130 all are connected with oil tank 110, first oil pump 120 is connected with work accessory 170 through accessory multi-way valve 140, accessory control oil duct 240 has between accessory multi-way valve 140 and the work accessory 170, second oil pump 130 is connected with switching-over valve 160 through walking multi-way valve 150, switching-over valve 160 is connected with accessory control oil duct 240, second oil pump 130 can be with hydraulic oil suction accessory control oil duct 240, in order to realize the confluence control to work accessory 170. Compared with the prior art, the utility model provides an accessory confluence hydraulic system 100 is owing to adopted the switching-over valve 160 of being connected with accessory control oil duct 240 and the second oil pump 130 of directly being connected with walking multi-way valve 150, so can carry out the outer confluence of valve, and the system pressure loss is little, and the confluence is effectual to be equipped with no actuating mechanism between second oil pump 130 and the work accessory 170, guarantee that confluence control is reliable and stable. The confluence operation of the excavator is simple and reliable, and the practicability is high.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a kind of utensil confluence hydraulic system, its characterized in that includes oil tank, first oil pump, second oil pump, accessory multiple unit valve, walking multiple unit valve, switching-over valve and work accessory, first oil pump with the second oil pump all with the oil tank is connected, first oil pump pass through accessory multiple unit valve with the work accessory is connected, accessory control oil duct has between the accessory multiple unit valve with the work accessory, the second oil pump pass through the walking multiple unit valve with the switching-over valve is connected, the switching-over valve with accessory control oil duct connects, the second oil pump can with the hydraulic oil suction the accessory control oil duct to realize right the confluence control of work accessory.

2. The accessory confluence hydraulic system of claim 1, wherein the accessory multi-way valve comprises an accessory valve spool and an accessory valve body, the accessory valve body is provided with a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, the first oil inlet and the second oil inlet are both connected with the first oil pump, the first oil outlet is connected with the working accessory, the second oil outlet is connected with an oil return tank, the accessory valve spool is movably mounted in the accessory valve body, and the accessory valve spool can conduct the first oil inlet and the first oil outlet or conduct the second oil inlet and the second oil outlet.

3. The accessory confluence hydraulic system of claim 2, wherein the reversing valve comprises a reversing valve spool and a reversing valve body, the reversing valve body is provided with a third oil inlet, a third oil outlet and a fourth oil outlet, the third oil inlet is connected with the second oil pump through the walking multi-way valve, the third oil outlet is connected with the accessory control oil passage, the fourth oil outlet is connected with the oil tank through the walking multi-way valve, the reversing valve spool is movably mounted in the reversing valve body, and the reversing valve spool can conduct the third oil inlet and the third oil outlet or conduct the third oil inlet and the fourth oil outlet.

4. The accessory confluence hydraulic system of claim 3, further comprising a check valve connected between the third oil outlet and the accessory control gallery, the check valve being configured to prevent hydraulic oil in the accessory control gallery from flowing back to the third oil outlet.

5. The accessory confluence hydraulic system of claim 3, further comprising a hydraulic motor connected between the fourth oil outlet and the travel multiplex valve.

6. The accessory confluence hydraulic system of claim 3, further comprising a manual valve connected to the tank, the manual valve being connected to the accessory spool and the diverter spool, respectively, the manual valve being capable of moving the accessory spool within the accessory valve body and the manual valve being further capable of moving the diverter spool within the diverter valve body.

7. The accessory confluence hydraulic system of claim 6, further comprising a transposition control oil passage including a main oil passage and two branch oil passages connected to each other, the main oil passage being connected to the manual valve, one of the branch oil passages being connected to the accessory spool, and the other of the branch oil passages being connected to the direction changing spool.

8. The accessory confluence hydraulic system of claim 1, wherein the walking multi-way valve comprises a walking valve spool and a walking valve body, the walking valve body is provided with a fourth oil inlet, a fifth oil outlet and a sixth oil outlet, the fourth oil inlet and the fifth oil inlet are both connected with the second oil pump, the fifth oil outlet is connected with the reversing valve, the sixth oil outlet is connected with an oil return tank, the walking valve spool is movably mounted in the walking valve body, and the walking valve spool can conduct the fourth oil inlet and the fifth oil outlet or conduct the fifth oil inlet and the sixth oil outlet.

9. The accessory confluence hydraulic system of claim 8, further comprising a foot valve, wherein the foot valve is connected to the tank, the foot valve is connected to the travel spool, and the foot valve is capable of driving the travel spool to move within the travel valve body.

10. An excavator comprising the accessory confluence hydraulic system as claimed in any one of claims 1 to 9.