CN116677036A - Main valve, crushing control system and excavator - Google Patents

Abstract

The invention relates to a breaking hammer control valve structure, and discloses a main valve, a hydraulic breaking control system and an excavator. The main valve can flexibly control the two hydraulic pumps, has a good energy-saving effect, and prolongs the service life of the hydraulic pumps.

Description

Main valve, crushing control system and excavator

Technical Field

The invention relates to a breaking hammer control valve structure, in particular to a main valve. In addition, the invention also relates to a crushing control system and an excavator.

Background

Currently, more and more excavators are being used in various fields. The hydraulic breaker is more and more applied in working conditions such as demolishing old buildings, cement pavements, mining, and the like, compared with the working condition of a bucket, the hydraulic breaker is more frequently switched between high pressure and low pressure when an excavator works under the working condition of the bucket, the pressure amplitude is higher, the hydraulic breaker works under the working condition of the bucket for a long time and is very harmful to the main pump, because the main pump of the existing large excavator adopts a duplex pump, two pumps of the duplex pump simultaneously drive the breaking hammer to work, and the two pumps of the duplex pump are frequently switched between the high pressure and the low pressure when working under the working condition of the bucket, and the hydraulic breaker is easy to damage after one of the pumps is damaged, the whole main pump cannot be used, so that the service life of the main pump is reduced.

Hydraulic breaking hammers are generally mounted on an excavator and work by using hydraulic energy provided by the excavator. The energy output by the hydraulic pump is transmitted to the breaking hammer through the control of the main valve, so that the breaking hammer is driven to work. Conventional hydraulic breaking hammer control systems typically have one hydraulic pump as the main pump and another hydraulic pump as the auxiliary pump (which cannot be controlled individually). When using the main pump to control, crushing efficiency is higher, but, the excavator is at the during operation of crushing operating mode, and the main pump pressure switches more frequently between high pressure and low pressure, and the pressure amplitude is higher, and the long-term work that is in under the crushing operating mode harm very big to the main pump, and the life of main pump can reduce. When the main pump and the auxiliary pump are used to operate in combination, there is a large energy loss.

Disclosure of Invention

The technical problem to be solved by the first aspect of the present invention is to provide a main valve, which can flexibly control two hydraulic pumps, has a better energy-saving effect, and prolongs the service life of the hydraulic pumps.

The technical problem to be solved by the second aspect of the invention is to provide a crushing control system which can flexibly control two hydraulic pumps, has a better energy-saving effect and prolongs the service life of the hydraulic pumps.

The technical problem to be solved by the third aspect of the invention is to provide an excavator, wherein the crushing control system of the excavator can flexibly control two hydraulic pumps, has a better energy-saving effect and prolongs the service life of the hydraulic pumps.

In order to solve the technical problems, the first aspect of the invention provides a main valve, which comprises a valve body, a first crushing control valve group and a second crushing control valve group which are integrated in the valve body, a first crushing oil circuit connected with a first oil inlet and a second crushing oil circuit connected with a second oil inlet, wherein the first crushing control valve group comprises a first crushing control valve, the first crushing oil circuit is connected with a crushing oil port through the first crushing control valve, the second crushing control valve group comprises a second crushing control valve, and the second crushing oil circuit is connected with the crushing oil port through the second crushing control valve.

In some embodiments, the first crushing control valve comprises a first crushing pilot control valve and a first cartridge valve, the first crushing oil circuit is connected with the crushing oil port through the first cartridge valve, and the first crushing oil circuit is connected with a first control cavity of the first cartridge valve through the first crushing pilot control valve; the second crushing control valve comprises a second crushing pilot control valve and a second cartridge valve, the second crushing oil circuit is connected with the crushing oil port through the second cartridge valve, and the second crushing oil circuit is connected with a second control cavity of the second cartridge valve through the second crushing pilot control valve.

In some embodiments, a first check valve is disposed on an oil path between the first cartridge valve and the crushing oil port, a second check valve is disposed on an oil path between the second cartridge valve and the crushing oil port, and the second check valve is connected to the oil path between the first check valve and the crushing oil port.

In some embodiments, the crushing pressure control valve is further included, one end of the crushing pressure control valve is connected to an oil path between the first one-way valve and the crushing oil port, and the other end of the crushing pressure control valve is connected to an oil return path.

In some embodiments, the device further comprises a third one-way valve, one end of the third one-way valve is connected to an oil path between the first one-way valve and the crushing oil port, and the other end of the third one-way valve is connected with the oil return oil path.

In some embodiments, the first cartridge valve includes a first cartridge valve plug, a first cartridge valve spring, and a first cartridge valve core that are sequentially connected, the first control cavity is formed between the first cartridge valve plug and the first cartridge valve core, and the first breaking pilot control valve includes a first breaking pilot control valve core to control opening and closing of the first cartridge valve.

In some embodiments, a throttling groove is arranged on the first cartridge valve core, and the first crushing oil circuit is communicated with the first control cavity through the throttling groove.

In some embodiments, a mounting groove for mounting the first cartridge valve spring is provided on a side of the first cartridge valve core facing the first cartridge valve plug.

In some embodiments, the hydraulic oil system further comprises a first working oil way connected with the first oil inlet and a second working oil way connected with the second oil inlet, wherein a first reversing valve is arranged on the first working oil way so as to cut off the first working oil way under the condition that the first crushing oil way is communicated with the crushing oil port; and a second reversing valve is arranged on the second working oil path so as to cut off the second working oil path under the condition that the second crushing oil path is communicated with the crushing oil port.

A second aspect of the invention provides a crushing control system provided with a main valve according to any one of the above-mentioned solutions.

According to a third aspect of the invention, there is provided an excavator provided with the crushing control system according to the above technical scheme.

Through the technical scheme, the invention has the following beneficial effects:

according to the invention, the first crushing control valve group and the second crushing control valve group are integrated in the valve body, and the single pump control, the double pump control or the double pump intermittent control can be realized through the first crushing control valve group and the second crushing control valve group, so that the single pump is prevented from being in a working state with high frequency and high pressure amplitude for a long time, the service life is effectively prolonged, the control mode is flexibly selected according to the requirement of working conditions, the energy consumption can be reduced as a whole, and a better energy saving effect is realized. Moreover, the existing two crushing oil ports are optimized into one crushing oil port, so that the volume of the main valve can be reduced.

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

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

FIG. 1 is a hydraulic schematic of a main valve in an embodiment of the invention;

FIG. 2 is a hydraulic schematic of a crushing control system in an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of a first fracturing control valve in an embodiment of the present invention;

fig. 4 is a hydraulic schematic of a first crushing control valve in an embodiment of the invention.

Description of the reference numerals

1 main valve 11 first breaking pilot control valve

12 first cartridge valve 101 first crushing oil path

102 second crushing oil way 103 oil return oil way

104 first working oil passage 105 second working oil passage

First crushing control port of Ao crushing oil port XAo1

Dro1 first crushing oil return port XAo2 second crushing control port

First reversing control port of Dro2 second crushing oil return port XBp1

XBp2 second reversing control port P1 first oil inlet

P2 second oil inlet 21 second crushing pilot control valve

22 second cartridge valve 31 first check valve

32 second check valve 4 breaking pressure control valve

5 third one-way valve 6 first reversing valve

7 second reversing valve 81 first hydraulic pump

82 second hydraulic pump 9 pilot valve group

91 first pilot 92 second pilot

93 third pilot valve 94 fourth pilot valve

A1 first pilot port A2 second pilot port

A3 third pilot port A4 fourth pilot port

P pilot oil inlet T pilot oil return port

200 breaking hammer

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured," or "connected" are to be construed broadly, and for example, the terms "connected" may be either fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of such features, such that features defining "first," "second," "third," "fourth" may explicitly or implicitly include one or more of such features.

The main valve of the present invention belongs to the hydraulic field, and a substantial technical idea thereof is a hydraulic connection relationship for a person skilled in the art. The relevant hydraulic components, such as reversing valves, non-return valves, cartridge valves, etc., are well known to those skilled in the art and are also common components in existing hydraulic systems, and therefore will be described only briefly below. After the technical idea of the present invention is known to those skilled in the art, the oil path, the valve, etc. may be simply replaced, so as to implement the function of the main valve of the present invention, which is also within the protection scope of the present invention.

In the present invention, the directional terms used are based on the orientation or positional relationship shown in the drawings and do not indicate or imply that the device or element in question must have a particular orientation, be constructed and operate in a particular orientation and therefore should not be construed as limiting the invention; the directional terms of the present invention should be construed in connection with its actual installation state.

As shown in fig. 1, a basic embodiment of the present invention provides a main valve, which includes a valve body, a first crushing control valve group, a second crushing control valve group, a first crushing oil path 101 and a second crushing oil path 102, wherein the first crushing control valve group and the second crushing control valve group are integrated in the valve body, the first crushing oil path 101 is connected with a first oil inlet P1, the second crushing oil path 102 is connected with a second oil inlet P2, the first crushing control valve group includes a first crushing control valve, the first crushing oil path 101 is connected with a crushing oil port Ao through the first crushing control valve, the second crushing control valve group includes a second crushing control valve, and the second crushing oil path 102 is connected with the crushing oil port Ao through the second crushing control valve.

In order to better understand the technical solution of the present invention, the application of the main valve of the present invention to a specific excavator will be described below.

As shown in fig. 2, the breaking port Ao is connected to the breaking hammer 200, the first oil inlet P1 is connected to the first hydraulic pump 81, and the second oil inlet P2 is connected to the second hydraulic pump 82. The working time of the first hydraulic pump 81 and the second hydraulic pump 82 can be adjusted and programmed according to the actual working requirement, for example, the first hydraulic pump 81 is used for independently controlling the action of the breaking hammer 200, the hydraulic oil output by the first hydraulic pump 81 flows to the first breaking control valve through the first breaking oil path 101, and flows to the breaking hammer 200 through the breaking oil port Ao by the first breaking control valve, so that the action of the breaking hammer 200 is controlled; similarly, the second hydraulic pump 82 is used for independently controlling the action of the breaking hammer 200, hydraulic oil output by the second hydraulic pump 82 flows to the second breaking control valve through the second breaking oil path 102, and flows to the breaking hammer 200 through the breaking oil port Ao by the second breaking control valve, so that the action of the breaking hammer 200 is controlled; alternatively, the first hydraulic pump 81 and the second hydraulic pump 82 are used to control the operation of the breaking hammer 200 together; alternatively, the operations of the breaking hammer 200 are alternately controlled by using the first hydraulic pump 81 and the second hydraulic pump 82 in a predetermined time sequence. The control mode is flexibly selected according to the requirements of working conditions, so that the energy consumption can be reduced as a whole, and a better energy-saving effect is realized; moreover, the single hydraulic pump is prevented from being in a working state with high frequency and high pressure amplitude for a long time, so that the service life of the hydraulic pump is effectively prolonged. The existing two crushing oil ports are optimized into one crushing oil port, so that the volume of the main valve can be reduced.

In some embodiments, as shown in fig. 1, 3 and 4, the first crushing control valve includes a first crushing pilot control valve 11 and a first cartridge valve 12, the first crushing oil path 101 is connected to the crushing oil port Ao through the first cartridge valve 12, the first oil inlet P1 is connected to one oil port of the first cartridge valve 12 through the first crushing oil path 101, the other oil port of the first cartridge valve 12 is connected to the crushing oil port Ao, and the first crushing oil path 101 is connected to the first control chamber 121 of the first cartridge valve 12 through the first crushing pilot control valve 11. The first breaking pilot control valve 11 may be a hydraulic valve such as a two-position two-way directional valve.

Specifically, the first crushing pilot control valve 11 and the first cartridge valve 12 are integrated into one valve block, the first cartridge valve 12 includes a first cartridge valve plug 122, a first cartridge valve spring 123 and a first cartridge valve core 124, the first cartridge valve plug 122, the first cartridge valve spring 123 and the first cartridge valve core 124 are sequentially connected, a first control cavity 121 is formed between the first cartridge valve plug 122 and the first cartridge valve core 124, the first crushing pilot control valve 11 includes a first crushing pilot control valve core 111, the first crushing pilot control valve core 111 is connected with the first control cavity 121 through an oil duct, the first crushing pilot control valve core 111 is respectively connected with a first crushing control port XAo1 and a first crushing oil return port Dro1, and when a control signal is input to the first crushing control port XAo1, the first crushing pilot control valve core 111 can be driven to move, so that the first control cavity 121 is communicated with the first crushing oil return port Dro1 through the first crushing pilot control valve 11, and the first cartridge valve core 12 is controlled to be opened, and the first hydraulic oil can flow to the first cartridge valve inlet port aro 12 through the oil duct; when no control signal is input to the first crushing control port XAo1, the first control chamber 121 cannot be communicated with the first crushing oil return port Dro1 through the first crushing pilot control valve 11, so that the first cartridge valve 12 is in a closed state, and hydraulic oil input by the first oil inlet P1 cannot flow to the crushing oil port Ao through the first cartridge valve 12.

The first cartridge valve core 124 is provided with the mounting groove towards one side of first cartridge valve plug 122, and the one end of first cartridge valve spring 123 inserts the mounting groove, and the other end and the first cartridge valve plug 122 butt of first cartridge valve spring 123.

Further, the first cartridge valve core 124 is provided with a throttling groove 125, the first crushing oil circuit 101 is communicated with the first control cavity 121 through the throttling groove 125, when no control signal is input into the first crushing control port XAo, the first control cavity 121 is communicated with the first crushing oil circuit 101 through the throttling groove 125, the pressure in the first control cavity 121 continuously acts on the first cartridge valve core 124, at this time, the first cartridge valve core 124 is sealed with the oil port of the first cartridge valve 12, and the oil circuit between the first crushing oil circuit 101 and the crushing oil port Ao is cut off.

Similarly, the first crushing control valve and the second crushing control valve have substantially the same structure, and thus, referring to the first crushing control valve shown in fig. 1, 3 and 4, the second crushing control valve may include a second crushing pilot control valve 21 and a second cartridge valve 22, the second crushing oil path 102 is connected to the crushing oil port Ao through the second cartridge valve 22, the second oil inlet P2 is connected to one oil port of the second cartridge valve 22 through the second crushing oil path 102, the other oil port of the second cartridge valve 22 is connected to the crushing oil port Ao, and the second crushing oil path 102 is connected to the second control chamber of the second cartridge valve 22 through the second crushing pilot control valve 21. The second crushing pilot control valve 21 may be a hydraulic valve such as a two-position two-way directional valve.

Specifically, the second breaking pilot control valve 21 and the second cartridge valve 22 are integrated into a valve block, the second cartridge valve 22 comprises a second cartridge valve plug, a second cartridge valve spring and a second cartridge valve core, the second cartridge valve plug, the second cartridge valve spring and the second cartridge valve core are sequentially connected, a second control cavity is formed between the second cartridge valve plug and the second cartridge valve core, the second breaking pilot control valve 21 comprises a second breaking pilot control valve core, the second breaking pilot control valve core is connected with the second control cavity through an oil duct, the second breaking pilot control valve core is respectively connected with a second breaking control port XAo and a second breaking oil return port Dro2, and when a control signal is input by the second breaking control port XAo, the second breaking pilot control valve core can be driven to move, so that the second control cavity is communicated with the second breaking oil return port Dro2 through the second breaking pilot control valve 21, the second cartridge valve 22 is controlled to open, and hydraulic oil input by the second oil inlet P2 can flow to the second cartridge valve 22 through the second oil port Ao; when no control signal is input to the second crushing control port XAo2, the second control chamber cannot be communicated with the second crushing oil return port Dro2 through the second crushing pilot control valve 21, so that the second cartridge valve 22 is in a closed state, and hydraulic oil input by the second oil inlet P2 cannot flow to the crushing oil port Ao through the second cartridge valve 22.

One side of the second cartridge valve core, which faces the second cartridge valve plug, is provided with a mounting groove, one end of the second cartridge valve spring is inserted into the mounting groove, and the other end of the second cartridge valve spring is abutted with the second cartridge valve plug.

Further, a throttling groove is arranged on the second cartridge valve core, the second crushing oil circuit 102 is communicated with the second control cavity through the throttling groove, when a control signal is not input into the second crushing control port XAo, the second control cavity is communicated with the second crushing oil circuit 102 through the throttling groove, the pressure in the second control cavity continuously acts on the second cartridge valve core, at the moment, the second cartridge valve core is sealed with an oil port of the second cartridge valve 22, and an oil circuit between the second crushing oil circuit 102 and the crushing oil port Ao is cut off.

In some embodiments, as shown in fig. 2, the first oil inlet P1 is connected to the first working oil path 104, the second oil inlet P2 is connected to the second working oil path 105, and the first working oil path 104 is provided with the first reversing valve 6, so that the first working oil path 104 is blocked when the first crushing oil path 101 is conducted with the crushing oil port Ao; the second pilot valve 7 is provided in the second working oil passage 105 to shut off the second working oil passage 105 when the second crushing oil passage 102 is in communication with the crushing oil port Ao. A plurality of functional valves, such as a reversing valve for controlling the steering of the excavator, a reversing valve for controlling a bucket and a reversing valve for controlling the lifting and descending of the arm support, are arranged on the first working oil way 104; similarly, the second working oil path 105 is also provided with a plurality of functional valves, such as a reversing valve for controlling the steering of the excavator, a reversing valve for controlling the bucket, and a reversing valve for controlling the lifting and lowering of the boom, and various operations of the excavator are realized by controlling the corresponding functional valves. The first reversing valve 6 and the second reversing valve 7 may be hydraulic valves such as two-position two-way reversing valves.

In some embodiments, a first check valve 31 is disposed on an oil path between the first cartridge valve 11 and the crushing port Ao, a second check valve 32 is disposed on an oil path between the second cartridge valve 21 and the crushing port Ao, and the second check valve 32 is connected to the oil path between the first check valve 31 and the crushing port Ao.

In some embodiments, the oil path between the first check valve 31 and the crushing port Ao is connected to one end of the crushing pressure control valve 4, and the other end of the crushing pressure control valve 4 is connected to the return oil path 103. Wherein the crushing pressure control valve 4 may be an overflow valve.

In some embodiments, the oil path between the first check valve 31 and the crushing port Ao is connected to one end of the third check valve 5, the other end of the third check valve 5 is connected to the return oil path 103, and the crushing pressure control valve 4 is arranged in parallel with the third check valve 5.

In order to better understand the technical idea of the present invention, the following description is made in connection with relatively comprehensive technical features.

As shown in fig. 1, 3 and 4, the preferred embodiment of the present invention provides a main valve, which includes a valve body, a first crushing control valve group, a second crushing control valve group, a first crushing oil path 101, a second crushing oil path 102, a first working oil path 104 and a second working oil path 105, wherein the first crushing control valve group and the second crushing control valve group are integrated in the valve body, the first crushing oil path 101 is connected with a first oil inlet P1, and the second crushing oil path 102 is connected with a second oil inlet P2. The first crushing control valve group comprises a first crushing control valve, the first crushing control valve comprises a first crushing pilot control valve 11 and a first cartridge valve 12, a first oil inlet P1 is connected with one oil port of the first cartridge valve 12 through a first crushing oil path 101, the other oil port of the first cartridge valve 12 is connected with a crushing oil port Ao, the first cartridge valve 12 comprises a first cartridge valve plug 122, a first cartridge valve spring 123 and a first cartridge valve core 124, the first cartridge valve plug 122, the first cartridge valve spring 123 and the first cartridge valve core 124 are sequentially connected, a first control cavity 121 is formed between the first cartridge valve plug 122 and the first cartridge valve core 124, the first crushing oil path 101 is connected with the first control cavity 121 of the first cartridge valve 12 through the first crushing pilot control valve 11, a throttling groove 125 is arranged on the first cartridge valve core 124, and the first crushing oil path 101 is communicated with the first control cavity 121 through the throttling groove 125. The second crushing control valve group comprises a second crushing control valve, the second crushing control valve comprises a second crushing pilot control valve 21 and a second cartridge valve 22, a second oil inlet P2 is connected with one oil port of the second cartridge valve 22 through a second crushing oil path 102, the other oil port of the second cartridge valve 22 is connected with a crushing oil port Ao, the second cartridge valve 22 comprises a second cartridge valve plug, a second cartridge valve spring and a second cartridge valve core, the second cartridge valve plug, the second cartridge valve spring and the second cartridge valve core are sequentially connected, a second control cavity is formed between the second cartridge valve plug and the second cartridge valve core, the second crushing pilot control valve 21 comprises a second crushing pilot control valve core, the second crushing pilot control valve core is connected with the second control cavity through an oil path, and the second crushing oil path 102 is connected with the second control cavity of the second cartridge valve 22 through the second crushing pilot control valve 21. The first working oil path 104 is provided with a first reversing valve 6 to stop the first working oil path 104 when the first crushing oil path 101 is communicated with the crushing oil port Ao; the second pilot valve 7 is provided in the second working oil passage 105 to shut off the second working oil passage 105 when the second crushing oil passage 102 is in communication with the crushing oil port Ao. The oil way between the first cartridge valve 11 and the crushing oil port Ao is provided with a first one-way valve 31, the oil way between the second cartridge valve 21 and the crushing oil port Ao is provided with a second one-way valve 32, and the second one-way valve 32 is connected to the oil way between the first one-way valve 31 and the crushing oil port Ao. An oil path between the first check valve 31 and the crushing oil port Ao is connected with one end of the crushing pressure control valve 4, and the other end of the crushing pressure control valve 4 is connected with the oil return oil path 103. An oil path between the first check valve 31 and the crushing oil port Ao is connected with one end of the third check valve 5, the other end of the third check valve 5 is connected with the oil return path 103, and the crushing pressure control valve 4 is arranged in parallel with the third check valve 5.

Based on the above technical scheme, compared with the prior art, the main valve of the invention is additionally provided with one path of crushing control valve, so that the first hydraulic pump 81 and the second hydraulic pump 82 can respectively and independently control the crushing hammer 200, double-pump confluence can be realized, double-pump alternate action can be realized, and the flexibility of crushing control is improved.

Only one oil outlet is needed for the crushing function of the excavator, so that only one crushing oil port Ao is reserved, and the size of the main valve can be reduced. Meanwhile, the crushing function does not need micro action, the traditional slide valve core control mode is omitted, the taper valve mode of the first cartridge valve 12 and the second cartridge valve 22 is adopted and integrated in the main valve, and compared with the existing mode of externally arranging the crushing control valve in the main valve, the main valve disclosed by the invention is small in size, does not need external pipeline connection, and is convenient in pipeline arrangement.

As shown in fig. 2, the invention also discloses a crushing control system, which comprises a main valve 1, a first hydraulic pump 81, a second hydraulic pump 82 and a pilot valve group 9, wherein the main valve is provided with a crushing oil port Ao, a first crushing control port XAo1, a first crushing oil return port Dro1, a second crushing control port XAo2, a second crushing oil return port Dro2, a first reversing control port XBp1, a second reversing control port XBp2, a first oil inlet P1 and a second oil inlet P2. The pilot valve group 9 includes a first pilot valve 91, a second pilot valve 92, a third pilot valve 93, and a fourth pilot valve 94, and has a first pilot port A1, a second pilot port A2, a third pilot port A3, a fourth pilot port A4, a pilot oil inlet P, and a pilot oil return port T, where the pilot oil inlet P is connected to oil inlets of valves such as the first pilot valve 91, the second pilot valve 92, the third pilot valve 93, and the fourth pilot valve 94, and provides pilot oil to the first pilot valve 91, the second pilot valve 92, the third pilot valve 93, and the fourth pilot valve 94, and the pilot oil return port T is connected to oil return ports of valves such as the first pilot valve 91, the second pilot valve 92, the third pilot valve 93, and the fourth pilot valve 94, and is used for oil return of the first pilot valve 91, the second pilot valve 92, the third pilot valve 93, and the fourth pilot valve 94. The first hydraulic pump 81 is connected with the first oil inlet P1, the second hydraulic pump 82 is connected with the second oil inlet P2, and the breaking oil port Ao is connected with the breaking hammer 200. The first pilot valve 91 is connected to the control end of the first breaking pilot control valve 11 through the first pilot port A1 and the first breaking control port XAo, and the first breaking pilot control valve 11 can be controlled by outputting a pilot signal through the first pilot valve 91, so that the opening and closing of the first cartridge valve 12 are controlled, and when the first cartridge valve 12 is opened, hydraulic oil output by the first hydraulic pump 81 can flow to the breaking oil port Ao in one direction through the first breaking oil path 101, the first cartridge valve 12 and the first check valve 31, so as to drive the breaking hammer 200 to act. The second pilot valve 92 is connected to the control end of the second breaking pilot control valve 21 through the second pilot port A2 and the second breaking control port XAo, and outputs a pilot signal through the second pilot valve 92 to control the second breaking pilot control valve 21, so as to control the opening and closing of the second cartridge valve 22, and when the second cartridge valve 22 is opened, hydraulic oil output by the second hydraulic pump 82 can flow in one direction to the breaking oil port Ao through the second breaking oil path 102, the second cartridge valve 22 and the second check valve 32, so as to drive the breaking hammer 200 to act. The third pilot valve 93 is connected to the second reversing valve 7 through the third pilot port A3 and the first reversing control port XBp1, and the third pilot valve 93 outputs a pilot signal to control the reversing of the second reversing valve 7, thereby controlling the on/off of the second working oil path 105. The fourth pilot valve 94 is connected to the first reversing valve 6 through the fourth pilot port A4 and the second reversing control port XBp, and the fourth pilot valve 94 outputs a pilot signal to control the reversing of the first reversing valve 6, thereby controlling the on/off of the first working oil path 104. The first pilot valve 91, the second pilot valve 92, the third pilot valve 93, and the fourth pilot valve 94 may be solenoid valves such as two-position three-way solenoid valves and one-position three-way solenoid valves.

When the first hydraulic pump 81 is required to work, the first pilot valve 91 is controlled to output a pilot signal, the first breaking pilot control valve 11 is controlled to switch, so as to control the opening of the first cartridge valve 12, and the fourth pilot valve 94 is controlled to output a pilot signal, and the first switching valve 6 is controlled to switch, so that the first working oil path 104 is in a cut-off state, and hydraulic oil output by the first hydraulic pump 81 can flow to the breaking oil port Ao through the first breaking oil path 101 and the first cartridge valve 12 in sequence, so as to drive the breaking hammer 200 to act.

When the second hydraulic pump 82 is required to work, the second pilot valve 92 is controlled to output a pilot signal, the second breaking pilot control valve 21 is controlled to switch, so as to control the opening of the second cartridge valve 22, and meanwhile, the third pilot valve 94 is controlled to output a pilot signal, the second switching valve 7 is controlled to switch, so that the second working oil path 105 is in a cut-off state, and hydraulic oil output by the second hydraulic pump 82 can flow to the breaking oil port Ao through the second breaking oil path 102 and the second cartridge valve 22 in sequence, so as to drive the breaking hammer 200 to act.

According to different crushing working conditions, the following functions can be realized through the existing control program:

the first hydraulic pump 81 is operated independently, and the second hydraulic pump 82 is not operated;

the first hydraulic pump 81 is not operated, and the second hydraulic pump 82 is independently operated;

the first hydraulic pump 81 and the second hydraulic pump 82 work together in a double-pump manner, and the power between the two hydraulic pumps is proportionally carried out through a control program;

the first and second hydraulic pumps 81 and 82 are operated alternately and individually, and the alternate interval time can be controlled by a control program.

The control mode of the breaking hammer 200 is more flexible, and the alternate control of the two hydraulic pumps can be realized, so that the energy-saving effect is achieved, and the service life of the pump is greatly prolonged.

It should be noted that, for the operation modes of the first hydraulic pump 81 and the second hydraulic pump 82, a person skilled in the art can program a control program to achieve a better match between the control program and each solenoid valve, so as to achieve various operation modes of the first hydraulic pump 81 and the second hydraulic pump 82, and the control program belongs to a relatively conventional technical means in the art and is not described herein.

The invention discloses an excavator, such as an excavator with the speed of more than 50t, which comprises the crushing control system according to any one of the technical schemes, so that the excavator at least has all the beneficial effects brought by the technical schemes of the embodiment of the crushing control system.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (11)

1. The utility model provides a main valve, its characterized in that includes the valve body, integrates first broken control valves and the broken control valves of second in the valve body, with first broken oil circuit (101) that first oil inlet (P1) is connected and with broken oil circuit (102) of second oil inlet (P2) is connected, first broken control valves includes first broken control valve, first broken oil circuit (101) are passed through first broken control valve is connected with broken hydraulic fluid port (Ao), second broken control valves includes the broken control valve of second, broken oil circuit (102) are passed through the broken control valve of second with broken hydraulic fluid port (Ao) are connected.

2. The main valve according to claim 1, characterized in that the first crushing control valve comprises a first crushing pilot control valve (11) and a first cartridge valve (12), the first crushing oil circuit (101) being connected with the crushing oil port (Ao) through the first cartridge valve (12), the first crushing oil circuit (101) being connected with a first control chamber (121) of the first cartridge valve (12) through the first crushing pilot control valve (11); the second crushing control valve comprises a second crushing pilot control valve (21) and a second cartridge valve (22), the second crushing oil circuit (102) is connected with the crushing oil port (Ao) through the second cartridge valve (22), and the second crushing oil circuit (102) is connected with a second control cavity of the second cartridge valve (22) through the second crushing pilot control valve (21).

3. The main valve according to claim 2, characterized in that a first one-way valve (31) is arranged on an oil path between the first cartridge valve (11) and the crushing oil port (Ao), a second one-way valve (32) is arranged on an oil path between the second cartridge valve (21) and the crushing oil port (Ao), and the second one-way valve (32) is connected to an oil path between the first one-way valve (31) and the crushing oil port (Ao).

4. A main valve according to claim 3, further comprising a crushing pressure control valve (4), one end of the crushing pressure control valve (4) being connected to an oil path between the first check valve (31) and the crushing port (Ao), and the other end being connected to an oil return path (103).

5. The main valve according to claim 4, further comprising a third one-way valve (5), one end of the third one-way valve (5) being connected to an oil path between the first one-way valve (31) and the crushing port (Ao), the other end being connected to the return oil path (103).

6. The main valve according to claim 2, wherein the first cartridge valve (12) comprises a first cartridge valve plug (122), a first cartridge valve spring (123) and a first cartridge valve core (124) which are sequentially connected, the first control cavity (121) is formed between the first cartridge valve plug (122) and the first cartridge valve core (124), and the first breaking pilot control valve (11) comprises a first breaking pilot control valve core (111) to control opening and closing of the first cartridge valve (12).

7. The main valve according to claim 6, characterized in that a throttling groove (125) is provided on the first cartridge valve (124), and the first crushing oil path (101) communicates with the first control chamber (121) through the throttling groove (125).

8. The main valve of claim 6, wherein a side of the first cartridge valve core (124) facing the first cartridge valve plug (122) is provided with a mounting groove for mounting the first cartridge valve spring (123).

9. The main valve according to any one of claims 1 to 8, further comprising a first working oil circuit (104) connected to the first oil inlet (P1) and a second working oil circuit (105) connected to the second oil inlet (P2), the first working oil circuit (104) being provided with a first reversing valve (6) to shut off the first working oil circuit (104) in case the first crushing oil circuit (101) is in communication with the crushing oil port (Ao); the second working oil way (105) is provided with a second reversing valve (7) so as to stop the second working oil way (105) when the second crushing oil way (102) is communicated with the crushing oil port (Ao).

10. A crushing control system, characterized in that a main valve according to any one of claims 1 to 9 is provided.

11. An excavator, characterized in that a crushing control system according to claim 10 is provided.