CN115306780A

CN115306780A - Hydraulic system and engineering machinery

Info

Publication number: CN115306780A
Application number: CN202210896774.1A
Authority: CN
Inventors: 黄东; 邱国庆; 吴昊
Original assignee: Sany Heavy Equipment Co Ltd
Current assignee: Sany Heavy Equipment Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-08
Also published as: WO2024021578A1

Abstract

The invention provides a hydraulic system and an engineering machine, wherein the hydraulic system comprises: a hydraulic oil tank; the pump station is connected with the hydraulic oil tank; the first multi-way valve is connected with the pump station; the second multi-connected multi-way valve is connected with the pump station; when the first hydraulic control reversing valve is positioned at a first station, the first multi-way valve is communicated with the pump station, and when the first hydraulic control reversing valve is positioned at a second station, the first multi-way valve is communicated with the hydraulic oil tank; the second hydraulic control reversing valve is connected with the second multi-connected multi-way valve; the third hydraulic control reversing valve is connected with the second multi-way valve; the first driving piece is connected with the second hydraulic control reversing valve and the third hydraulic control reversing valve, and when the second hydraulic control reversing valve is positioned at the first station and the third hydraulic control reversing valve is positioned at the first station, the first driving piece is in a working state; and the second driving piece is connected with the second hydraulic control reversing valve and the third hydraulic control reversing valve, and when the second hydraulic control reversing valve is positioned at the second station and the third hydraulic control reversing valve is positioned at the second station, the second driving piece is in a working state.

Description

Hydraulic system and engineering machinery

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a hydraulic system and engineering machinery.

Background

In the related art, the manually driven joist supporting device is often low in working efficiency and is easy to cause personal injury due to the falling of a steel beam and the like; the joist device driven by the motor needs to be provided with a motor, a screw rod and other driving or transmission devices, the structure is complex, the flexibility is low, and the accurate positioning is difficult.

Disclosure of Invention

In order to solve or improve at least one of the above technical problems, an object of the present invention is to provide a hydraulic system.

Another object of the present invention is to provide a working machine having the above hydraulic system.

To achieve the above object, a first aspect of the present invention provides a hydraulic system including: a hydraulic oil tank; the pump station is connected with the hydraulic oil tank; the first multi-way valve is connected with the pump station; the second multi-connected multi-way valve is connected with the pump station; the first hydraulic control reversing valve is connected with the first multi-way valve, the first hydraulic control reversing valve is connected with the pump station, the first hydraulic control reversing valve is connected with the hydraulic oil tank, the first multi-way valve is communicated with the pump station when the first hydraulic control reversing valve is positioned at a first station, and the first multi-way valve is communicated with the hydraulic oil tank when the first hydraulic control reversing valve is positioned at a second station; the second hydraulic control reversing valve is connected with the second multi-connected multi-way valve; the third hydraulic control reversing valve is connected with the second multi-way valve; the first driving piece is connected with the second hydraulic control reversing valve, the first driving piece is connected with the third hydraulic control reversing valve, and the first driving piece is in a working state when the second hydraulic control reversing valve is positioned at a first station and the third hydraulic control reversing valve is positioned at the first station; and the second driving piece is connected with the third hydraulic control reversing valve, the second driving piece is connected with the second hydraulic control reversing valve, and the second driving piece is in a working state when the second hydraulic control reversing valve is positioned at a second station and the third hydraulic control reversing valve is positioned at the second station.

According to the embodiment of the hydraulic system provided by the invention, the driving piece is driven by the hydraulic system, and compared with a manual driving mode or a motor driving mode, the hydraulic system has the advantages of simple structure, high sensitivity, easiness in accurate positioning and capability of improving the working efficiency and the safety performance. The first driving piece is used for tunneling work, the second driving piece is used for supporting work, a branch oil way is additionally arranged on a hydraulic oil way of the first driving piece to control the second driving piece, the function switching of tunneling and supporting work is realized, and when the second driving piece is in a working state, the first driving piece is in a locking state. In addition, through addding first liquid accuse switching-over valve, when realizing strutting the operation, star gear, fortune motor are in the locking state, avoid causing personnel's injury or equipment damage because of the maloperation.

Specifically, the hydraulic system comprises a hydraulic oil tank, a pump station, a first multi-way valve, a second multi-way valve, a first hydraulic control reversing valve, a second hydraulic control reversing valve, a third hydraulic control reversing valve, a first driving piece and a second driving piece. The hydraulic oil tank is a storage container and is used for storing working media. The working medium may be hydraulic oil or the like. The pump station is connected with the hydraulic oil tank. The first multi-way valve is connected with the pump station, and the second multi-way valve is connected with the pump station. Optionally, the pump station comprises at least two connected pump bodies, wherein one pump body is used for being connected with the first multi-way valve, the pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to each executing part; the other pump body is used for being connected with the second multi-connected multi-way valve, the pump body can pump the working medium in the hydraulic oil tank to the second multi-connected multi-way valve, and then the second multi-connected multi-way valve distributes the working medium to each execution piece. Optionally, the first multi-way valve is used for being connected with the left star wheel motor, the right star wheel motor, the transporting motor and the like. The second multi-way valve is used for being connected with a shovel plate lifting driving piece, a cutting head rotary driving piece, a cutting head telescopic driving piece, a rear supporting driving piece, a left walking driving piece, a right walking driving piece and the like.

Furthermore, the first hydraulic control reversing valve is connected with the first multi-way valve. The first hydraulic control reversing valve is connected with a pump station. The first hydraulic control reversing valve is connected with the hydraulic oil tank. Optionally, the first pilot operated directional control valve has a first port, a second port and a third port. A first interface of the first hydraulic control reversing valve is connected with the first multi-way valve; the second interface of the first hydraulic control reversing valve is connected with the pump station; and a third interface of the first hydraulic control reversing valve is connected with a hydraulic oil tank.

When the first hydraulic control reversing valve is located at the first station, the first interface is connected with the second interface, and the first multi-way valve is communicated with the pump station. Specifically, the pump station includes a first pump body and a second pump body that are connected. The first pump body is provided with an oil outlet and a control oil port. The first multi-connected multi-way valve is provided with an oil inlet and a load sensitive oil port. The oil outlet of the first pump body is connected with the oil inlet of the first multi-way valve. The load sensitive oil port is connected with the first interface. The second interface is connected with the control oil port. When the first hydraulic control reversing valve is positioned at the first station, the first interface is connected with the second interface, and the feedback oil path sequentially passes through the load sensitive oil port, the first interface, the second interface and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-connected multi-way valve, and then the first multi-connected multi-way valve distributes the working medium to driving pieces such as the left star wheel motor, the right star wheel motor or the one-motion motor. It can be understood that when the first hydraulic control reversing valve is in the first station, driving parts such as a left star wheel motor, a right star wheel motor or a conveying motor are in a working state.

When the first hydraulic control reversing valve is located at the second station, the first multi-way valve is communicated with the hydraulic oil tank. Specifically, when the first hydraulic control reversing valve is located at the first station, the first interface is connected with the third interface, and the feedback oil path sequentially passes through the load sensitive oil port, the first interface, the third interface and the hydraulic oil tank. The control oil port of the first pump body does not receive the working medium of the feedback oil path, and at the moment, the first pump body cannot pump the working medium to the first multi-connected multi-way valve. It can be understood that when the first hydraulic control reversing valve is in the second station, driving parts such as a left star wheel motor, a right star wheel motor or a conveying motor are in a locking state.

And further, a second hydraulic control reversing valve is connected with a second multi-way valve. And the third hydraulic control reversing valve is connected with the second multi-way valve. Optionally, the second hydraulic control directional control valve and the third hydraulic control directional control valve are connected with the same group of the second multi-connected multi-way valve. Furthermore, the first driving piece is connected with the second hydraulic control reversing valve, and the first driving piece is connected with the third hydraulic control reversing valve. Optionally, the first driving member is a cutting telescopic driving member; the second driving member is a joist device driving member. Specifically, the first driving piece is a first oil cylinder, and the first oil cylinder is provided with a first rod cavity and a first rodless cavity; the second driving piece is a second oil cylinder, and the second oil cylinder is provided with a second rod cavity and a second rodless cavity. The second hydraulic control reversing valve is provided with a fourth interface, a fifth interface and a sixth interface. The fourth interface is connected with the second multi-way valve; the fifth interface is connected with the first rod-free cavity; a sixth port is connected with the second rodless chamber. The fourth interface is selectively connected with the fifth interface or the sixth interface. When the second hydraulic control reversing valve is positioned at the first station, the fourth interface is connected with the fifth interface, and at the moment, a second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the fourth interface and the fifth interface and enter the first rodless cavity; when the second hydraulic control reversing valve is located at the second station, the fourth interface is connected with the sixth interface, and at the moment, the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the fourth interface and the sixth interface and enter the second rodless cavity.

Furthermore, the second driving piece is connected with the third hydraulic control reversing valve, and the second driving piece is connected with the second hydraulic control reversing valve. Optionally, the third pilot operated directional valve has a seventh port, an eighth port, and a ninth port. The seventh interface is connected with the second multi-way valve; the eighth interface is connected with the first rod cavity; the ninth port is connected with the second rod chamber. The seventh interface is selectively connected with the eighth interface or the ninth interface. When the third hydraulic control reversing valve is positioned at the first station, the seventh interface is connected with the eighth interface, and at the moment, a second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the seventh interface and the eighth interface and enter the first rod cavity; when the third hydraulic control reversing valve is located at the second station, the seventh interface is connected with the ninth interface, and at the moment, the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the seventh interface and the ninth interface and enter the second rod cavity.

In other words, when the second hydraulic control reversing valve is in the first station and the third hydraulic control reversing valve is in the first station, the first driving piece is in the working state. When the second hydraulic control reversing valve is located at the second station and the third hydraulic control reversing valve is located at the second station, the second driving piece is in a working state.

In the technical scheme defined by the invention, the driving part is driven by a hydraulic system, and compared with a manual driving mode or a motor driving mode, the hydraulic driving device has the advantages of simple structure, high sensitivity, easiness in accurate positioning and capability of improving the working efficiency and the safety performance. The first driving piece is used for tunneling work, the second driving piece is used for supporting work, a branch oil way is additionally arranged on a hydraulic oil way of the first driving piece to control the second driving piece, the function switching of tunneling and supporting work is realized, and when the second driving piece is in a working state, the first driving piece is in a locking state. In addition, through add first liquid accuse switching-over valve, when realizing strutting the operation, star gear, fortune motor are in the locking state, avoid causing personnel's injury or equipment damage because of the maloperation.

In addition, the technical scheme provided by the invention can also have the following additional technical characteristics:

in the technical scheme, the first multi-way valve is provided with an oil inlet and a load sensitive oil port, the first hydraulic control reversing valve is provided with a first interface, a second interface and a third interface, the first interface is connected with the load sensitive oil port, the second interface is connected with the pump station, the third interface is connected with the hydraulic oil tank, the first interface is selectively connected with the second interface or the third interface, and when the first hydraulic control reversing valve is positioned at a first station, the first interface is connected with the second interface; when the first hydraulic control reversing valve is positioned at the second station, the first interface is connected with the third interface.

In the technical scheme, a first interface of a first hydraulic control reversing valve is connected with a load sensitive oil port (LS port) of a first multi-way valve, a second interface of the first hydraulic control reversing valve is connected with a control oil port of a pump station, and a third interface of the first hydraulic control reversing valve is connected with a hydraulic oil tank. When the engineering machinery is in a tunneling state, the first hydraulic control reversing valve is located at a first station (the first interface is connected with the second interface), and the feedback oil path sequentially passes through the load sensitive oil port, the first interface, the second interface and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to driving pieces such as the left star wheel motor, the right star wheel motor or the first moving motor. It can be understood that when the first hydraulic control reversing valve is in the first station, driving parts such as the left star wheel motor, the right star wheel motor or a conveying motor are in a working state; when the engineering machinery carries out supporting operation, the first hydraulic control reversing valve is located at the second station (the first interface is connected with the third interface), and the feedback oil path sequentially passes through the load sensitive oil port, the first interface, the third interface and the hydraulic oil tank. The control oil port of the first pump body does not receive the working medium of the feedback oil path, and at the moment, the first pump body cannot pump the working medium to the first multi-connected multi-way valve. It can be understood that when the first hydraulic control reversing valve is in the second station, driving parts such as a left star wheel motor, a right star wheel motor or a conveying motor are in a locking state.

According to the technical scheme, the first hydraulic control reversing valve is added on the LS feedback oil path of the first multi-connection multi-way valve, so that locking of the star wheel and the first conveying motor is realized during supporting operation, and personnel injury and equipment damage caused by misoperation are avoided. The station of the first hydraulic control reversing valve is changed, the LS oil path of the first multi-unit multi-way valve is reversed, and a front pump (a first pump body) originally fed back to a pump station is changed into a return hydraulic oil tank.

In the above technical solution, the first driving member is a first oil cylinder, the first oil cylinder has a first rod cavity and a first rodless cavity, the second driving member is a second oil cylinder, and the second oil cylinder has a second rod cavity and a second rodless cavity; the second hydraulic control reversing valve is provided with a fourth interface, a fifth interface and a sixth interface, the fourth interface is connected with the second multi-connected multi-way valve, the fifth interface is connected with the first rodless cavity, the sixth interface is connected with the second rodless cavity, the fourth interface is selectively connected with the fifth interface or the sixth interface, and when the second hydraulic control reversing valve is positioned at the first station, the fourth interface is connected with the fifth interface; when the second hydraulic control reversing valve is positioned at a second station, the fourth interface is connected with the sixth interface; the third hydraulic control reversing valve is provided with a seventh interface, an eighth interface and a ninth interface, the seventh interface is connected with the second multi-connected multi-way valve, the eighth interface is connected with the first rod cavity, the ninth interface is connected with the second rod cavity, the seventh interface is selectively connected with the eighth interface or the ninth interface, and when the third hydraulic control reversing valve is positioned at the first station, the seventh interface is connected with the eighth interface; and when the third hydraulic control reversing valve is positioned at the second station, the seventh interface is connected with the ninth interface.

In the technical scheme, when the second hydraulic control reversing valve is positioned at the first station (the fourth interface is connected with the fifth interface), the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the fourth interface and the fifth interface and enter the first rodless cavity; when the second hydraulic control reversing valve is located at the second station (the fourth interface is connected with the sixth interface), the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the fourth interface and the sixth interface and enter the second rodless cavity. When the third hydraulic control reversing valve is positioned at the first station (the seventh interface is connected with the eighth interface), the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the seventh interface and the eighth interface and enter the first rod cavity; when the third hydraulic control reversing valve is located at the second station (the seventh interface is connected with the ninth interface), the second pump body of the pump station can enable working media in the hydraulic oil tank to sequentially pass through the second multi-connection multi-way valve, the seventh interface and the ninth interface and enter the second rod cavity.

In the above technical solution, the sixth interface is connected to the second rodless cavity through the first fluid path, and the hydraulic system further includes: and the speed regulating valve group is arranged on the first liquid path.

In this technical scheme, the second allies oneself with the multiple unit valve more is the proportional valve, can adjust the velocity of motion of driving piece, but the pressure and the flow of multiple unit valve are debugged in advance, consequently have certain limitation to the speed governing scope of second driving piece, can not satisfy the accurate location demand of joist ware after moving to the operating position. By additionally arranging the speed regulating valve group, the oil circuit of the oil cylinder of the joist device can be obviously reduced, so that the oil cylinder of the joist device can realize real-time speed regulation under lower pressure and flow, and further, the aim of carrying out fine positioning after the joist device moves to a position near a working position is fulfilled.

In the above technical solution, the speed regulating valve group includes: the manual reversing valve is provided with a tenth interface, an eleventh interface and a twelfth interface, the tenth interface is connected with the sixth interface, the eleventh interface is connected with the sixth interface, the twelfth interface is connected with the second rodless cavity, and the twelfth interface is selectively connected with the tenth interface or the eleventh interface; the throttling valve is arranged at the eleventh interface, and when the twelfth interface is connected with the tenth interface, the working medium sequentially passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity; when the twelfth interface is connected with the eleventh interface, the working medium sequentially passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity.

In the technical scheme, the speed regulating valve group comprises a manual reversing valve and a throttle valve. Specifically, the manual reversing valve has a tenth port, an eleventh port, and a twelfth port. A tenth interface of the manual reversing valve is connected with a sixth interface of the second hydraulic control reversing valve; the eleventh interface of the manual reversing valve is connected with the sixth interface of the second hydraulic control reversing valve; and a twelfth port of the manual reversing valve is connected with the second rodless cavity. The throttle valve is arranged at the eleventh interface of the manual reversing valve. The twelfth interface is selectively connected with the tenth interface or the eleventh interface.

Specifically, when the manual reversing valve is in the left position, the twelfth interface is connected with the tenth interface, the working medium sequentially passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity, and the movement speed of the second driving piece can be adjusted by controlling the opening degree of the handle assembly; when the manual reversing valve is in the right position, the twelfth interface is connected with the eleventh interface, the working medium sequentially passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity, and the throttle valve plays a role in throttling due to the fact that the throttle valve is arranged on the oil path, and therefore the low-speed working mode can be switched to by pulling the manual reversing valve to the right position. By the mode, the oil way of the second driving part can be obviously reduced, so that the second driving part can finish real-time speed regulation under lower pressure and flow, and the aim of fine positioning after the joist device moves to a position near a working position is fulfilled.

In the above technical solution, the first multi-way valve that allies oneself with has first pilot oil port, and the second multi-way valve that allies oneself with has second pilot oil port, and hydraulic system still includes: the shuttle valve is connected with the first pilot oil port, and the shuttle valve is connected with the second pilot oil port; a handle assembly connected to the shuttle valve; the drawing valve is connected with the shuttle valve, the drawing valve is connected with the first hydraulic control reversing valve, the drawing valve is connected with the second hydraulic control reversing valve, and the drawing valve is connected with the third hydraulic control reversing valve.

In this solution, the hydraulic system further comprises a shuttle valve, a handle assembly and a pull valve. Specifically, the first multi-connection multi-way valve has a first pilot oil port (X port), and the second multi-connection multi-way valve has a second pilot oil port (X port). The shuttle valve is connected with the first pilot oil port, and the shuttle valve is connected with the second pilot oil port. By providing the shuttle valve, a pressure selection function can be performed, and the working medium having a higher pressure is preferentially selected to pass through. Further, a handle assembly is coupled to the shuttle valve. Optionally, the handle assembly comprises a connected pilot handle and a four-way handle. The pilot handle is used for controlling the forward movement and the backward movement of the left walking driving piece; the pilot handle is used for controlling the forward movement and the backward movement of the right walking driving piece; the pilot handle is used for controlling the extension and retraction of the rear support driving piece; the pilot handle is used for controlling the descending and ascending of the shovel plate lifting driving piece; the pilot handle is used for controlling the forward rotation and the reverse rotation of a motor; the pilot handle is used for controlling the forward rotation and the reverse rotation of the star wheel motor. In addition, the four-way handle is used for controlling the lifting and descending of the cutting head lifting driving piece; the four-way handle is used for controlling the left rotation and the right rotation of the rotary driving piece of the cutting head. Furthermore, the drawing valve is connected with the shuttle valve, the drawing valve is connected with the first hydraulic control reversing valve, the drawing valve is connected with the second hydraulic control reversing valve, and the drawing valve is connected with the third hydraulic control reversing valve. The drawing valve controls the opening and closing of the oil circuit, and after the drawing valve stations are switched, the first hydraulic control reversing valve, the second hydraulic control reversing valve and the third hydraulic control reversing valve can be restored to the original positions.

In the above technical solution, the method further comprises: the balance valve is connected with the second hydraulic control reversing valve and is connected with the first driving piece; and/or the balance valve is connected with the third hydraulic control reversing valve and the balance valve is connected with the second driving piece.

In the technical scheme, the balance valve is arranged, so that the purpose of adjusting the flow by changing the flow resistance of the valve can be achieved. In general, there is a large pressure or flow difference between the media in various parts of the pipe or vessel, and the balancing valve can reduce or balance the pressure difference, adjust the relative balance of the pressures on the two sides, or achieve the balance of the flow by means of flow division.

In the above technical solution, the handle assembly includes a pilot handle and a four-way handle connected to each other.

In the technical scheme, a pilot handle is used for controlling the forward movement and the backward movement of a left walking driving piece; the pilot handle is used for controlling the forward and backward movement of the right walking driving piece; the pilot handle is used for controlling the extension and retraction of the rear support driving piece; the pilot handle is used for controlling the descending and ascending of the shovel plate lifting driving piece; the pilot handle is used for controlling the forward rotation and the reverse rotation of a motor; the pilot handle is used for controlling the forward rotation and the reverse rotation of the star wheel motor. The four-way handle is used for controlling the lifting and descending of the cutting head lifting driving piece; the four-way handle is used for controlling the left rotation and the right rotation of the rotary driving piece of the cutting head.

In the technical scheme, the pump station comprises at least two connected pump bodies, at least one pump body is connected with the first multi-connection multi-way valve, and the pump body is connected with the first hydraulic control reversing valve; and at least one pump body is connected with the second multi-way valve.

In this technical scheme, the pump station includes two at least consecutive pump bodys, and the quantity of the pump body is at least two, and the pump body can be two or more promptly, sets up the pump body in a flexible way according to actual demand. At least one pump body is connected with the first multi-way valve, and the pump body is connected with the first hydraulic control reversing valve; and at least one pump body is connected with the second multi-way valve. Optionally, the pump station comprises a first pump body and a second pump body connected. The first pump body is provided with an oil outlet and a control oil port. The first multi-connected multi-way valve is provided with an oil inlet and a load sensitive oil port. The oil outlet of the first pump body is connected with the oil inlet of the first multi-way valve. The load sensitive oil port is connected with the first interface. The second interface is connected with the control oil port of the first pump body. When the first hydraulic control reversing valve is located at the first station, the first interface is connected with the second interface, and the feedback oil path sequentially passes through the load sensitive oil port, the first interface, the second interface and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-connected multi-way valve, and then the first multi-connected multi-way valve distributes the working medium to driving pieces such as the left star wheel motor, the right star wheel motor or the one-motion motor. In addition, the second pump body can pump the working medium in the hydraulic oil tank to the second multi-connected multi-way valve, and then the working medium is distributed to the driving pieces through the second multi-connected multi-way valve.

A second aspect of the present invention provides a construction machine, including: the hydraulic system of any of the above embodiments; and the joist device is connected with a second driving piece of the hydraulic system.

According to an embodiment of the working machine according to the invention, the working machine comprises a hydraulic system and a joist machine as in any of the embodiments described above. The joist device is connected with a second driving element of the hydraulic system. Optionally, the work machine further comprises a cutting section, a star wheel motor and a transport motor. The cutting part is connected with the first driving part; the star wheel motor is connected with the first multi-connection multi-way valve; a motor and a first multiplex multi-way valve.

It should be noted that the construction machine may be a heading machine or the like.

The construction machine includes any one of the hydraulic systems in the first aspect, so that the beneficial effects of any one of the embodiments are achieved, and are not described herein again.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 illustrates a schematic diagram of a hydraulic system according to one embodiment of the present disclosure;

FIG. 2 shows a schematic diagram of a speed valve block according to an embodiment of the invention;

fig. 3 shows a schematic view of a working machine according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100: a hydraulic system; 111: a hydraulic oil tank; 112: a pump station; 1121: a first pump body; 1122: a second pump body; 121: a first multi-way valve; 1211: an oil inlet; 1212: a load sensitive oil port; 1213: a first pilot oil port; 122: a second multi-way valve; 1221: a second pilot oil port; 131: a first hydraulic control directional control valve; 1311: a first interface; 1312: a second interface; 1313: a third interface; 132: a second hydraulic control directional valve; 1321: a fourth interface; 1322: a fifth interface; 1323: a sixth interface; 133: a third hydraulic control directional control valve; 1331: a seventh interface; 1332: an eighth interface; 1333: a ninth interface; 141: a first driving member; 1411: a first rod chamber; 1412: a first rod-less chamber; 142: a second driving member; 1421: a second rod chamber; 1422: a second rodless cavity; 150: a speed regulating valve bank; 151: a manual directional control valve; 1511: a tenth interface; 1512: an eleventh interface; 1513: a twelfth interface; 152: a throttle valve; 161: a shuttle valve; 162: drawing the valve; 163: a balancing valve; 170: a handle assembly; 171: a pilot handle; 172: a four-way handle; 181: a first fluid path; 200: an engineering machine; 210: joist supporting devices.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of embodiments of the invention, briefly summarized above, may be had by reference to the appended drawings, which are appended to the following detailed description of embodiments of the invention. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, embodiments of the present invention may be practiced otherwise than as specifically described herein, and the scope of the present application is not limited by the specific details disclosed herein.

Referring now to fig. 1-3, a hydraulic system 100 and a work machine 200 provided in accordance with some embodiments of the present invention will be described.

Example one

As shown in fig. 1, a hydraulic system 100 according to an embodiment of the present invention includes a hydraulic oil tank 111, a pumping station 112, a first multiplex valve 121, a second multiplex valve 122, a first pilot-controlled directional control valve 131, a second pilot-controlled directional control valve 132, a third pilot-controlled directional control valve 133, a first driving member 141, and a second driving member 142. The hydraulic oil tank 111 is a storage container for storing a working medium. The working medium may be hydraulic oil or the like. The pumping station 112 is connected to the hydraulic oil tank 111. The first multiple multiplex valve 121 is connected to the pumping station 112, and the second multiple multiplex valve 122 is connected to the pumping station 112. Optionally, the pumping station 112 includes at least two connected pump bodies, one of the pump bodies is used for being connected with the first multiple-way valve 121, and the pump body can pump the working medium in the hydraulic oil tank 111 to the first multiple-way valve 121, and then distribute the working medium to each executing element by the first multiple-way valve 121; the other pump body is used for being connected with the second multiplex valve 122, and the pump body can pump the working medium in the hydraulic oil tank 111 to the second multiplex valve 122, and then the working medium is distributed to each actuator by the second multiplex valve 122. Optionally, the first multiple multi-way valve 121 is used for connecting with a left star wheel motor, a right star wheel motor, a motion motor and the like. The second multi-way valve 122 is used for being connected with a shovel plate lifting driving piece, a cutting head rotary driving piece, a cutting head telescopic driving piece, a rear supporting driving piece, a left walking driving piece, a right walking driving piece and the like.

Further, the first pilot-operated directional control valve 131 is connected to the first multiplex valve 121. The first hydraulically controlled directional control valve 131 is connected to the pumping station 112. The first pilot-operated directional control valve 131 is connected to the hydraulic oil tank 111. Optionally, the first pilot operated directional valve 131 has a first port 1311, a second port 1312, and a third port 1313. The first connector 1311 of the first pilot-controlled directional control valve 131 is connected with the first multiplex valve 121; the second interface 1312 of the first hydraulic control reversing valve 131 is connected with the pump station 112; the third port 1313 of the first pilot-operated directional control valve 131 is connected to the hydraulic oil tank 111.

When the first pilot-controlled reversing valve 131 is at the first station, the first interface 1311 is connected with the second interface 1312, and the first multi-way valve 121 is communicated with the pump station 112. Specifically, pump station 112 includes a first pump block 1121 and a second pump block 1122 that are connected. The first pump body 1121 has an oil outlet and a control port. The first multi-way valve 121 has an oil inlet 1211 and a load sensing oil port 1212. An oil outlet of the first pump body 1121 is connected to an oil inlet 1211 of the first multi-way valve 121. The load-sensitive port 1212 is connected to the first port 1311. The second interface 1312 is connected to the control port. When the first pilot-controlled directional control valve 131 is in the first station, the first connector 1311 is connected to the second connector 1312, and the feedback oil path sequentially passes through the load sensing oil port 1212, the first connector 1311, the second connector 1312 and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multi-connection multi-way valve 121, and then the first multi-connection multi-way valve 121 distributes the working medium to driving members such as a left star wheel motor, a right star wheel motor, or a transport motor. It can be understood that when the first pilot-operated directional control valve 131 is in the first position, the driving members such as the left star wheel motor, the right star wheel motor, or a transportation motor are in an operating state.

When the first pilot-controlled directional control valve 131 is in the second position, the first multi-way valve 121 is communicated with the hydraulic oil tank 111. Specifically, when the first pilot-controlled directional control valve 131 is in the first station, the first port 1311 is connected to the third port 1313, and the feedback oil path sequentially passes through the load-sensitive oil port 1212, the first port 1311, the third port 1313, and the hydraulic oil tank 111. The control oil port of the first pump body 1121 does not receive the working medium of the feedback oil path, and at this time, the first pump body 1121 does not pump the working medium to the first multi-gang multi-way valve 121. It can be understood that when the first pilot-controlled directional control valve 131 is in the second position, the driving members such as the left star wheel motor, the right star wheel motor, or a motion motor are in the locked state.

Further, a second hydraulic control directional control valve 132 is connected to the second multiplex valve 122. The third pilot operated directional control valve 133 is connected to the second multiplex valve 122. Optionally, the second pilot-controlled directional valve 132 and the third pilot-controlled directional valve 133 are connected with the same group of the second multiple-way valve 122. Further, the first driver 141 is connected to the second pilot-controlled directional control valve 132, and the first driver 141 is connected to the third pilot-controlled directional control valve 133. Optionally, the first driving member 141 is a cutting telescopic driving member; the second drive 142 is a joist drive. Specifically, the first driving member 141 is a first cylinder having a first rod chamber 1411 and a first rod-less chamber 1412; the second actuator 142 is a second cylinder having a second rod chamber 1421 and a second rodless chamber 1422. The second hydraulic directional valve 132 has a fourth port 1321, a fifth port 1322, and a sixth port 1323. The fourth port 1321 is connected to the second multiplex valve 122; the fifth interface 1322 is connected to the first rod chamber 1412; a sixth port 1323 is connected to the second rodless chamber 1422. The fourth interface 1321 is selectively connected to the fifth interface 1322 or the sixth interface 1323. When the second hydraulic control directional valve 132 is in the first station, the fourth port 1321 is connected to the fifth port 1322, and at this time, the second pump body 1122 of the pump station 112 can make the working medium in the hydraulic oil tank 111 sequentially pass through the second multi-way valve 122, the fourth port 1321, and the fifth port 1322, and enter the first rodless chamber 1412; when the second hydraulic control directional valve 132 is located at the second station, the fourth port 1321 is connected to the sixth port 1323, and at this time, the second pump body 1122 of the pump station 112 can enable the working medium in the hydraulic oil tank 111 to sequentially pass through the second multi-way valve 122, the fourth port 1321, and the sixth port 1323, and then enter the second rodless chamber 1422.

Further, the second driver 142 is connected to the third pilot operated directional valve 133, and the second driver 142 is connected to the second pilot operated directional valve 132. Optionally, the third pilot operated directional valve 133 has a seventh port 1331, an eighth port 1332, and a ninth port 1333. The seventh port 1331 is connected to the second multiplex valve 122; the eighth interface 1332 is connected to the first stemmed chamber 1411; the ninth interface 1333 is connected to the second rod chamber 1421. The seventh interface 1331 is selectively connected to the eighth interface 1332 or the ninth interface 1333. When the third pilot-controlled directional control valve 133 is at the first station, the seventh port 1331 is connected to the eighth port 1332, and at this time, the second pump body 1122 of the pump station 112 can enable the working medium in the hydraulic oil tank 111 to sequentially pass through the second multi-way valve 122, the seventh port 1331 and the eighth port 1332, and enter the first rod chamber 1411; when the third pilot-controlled directional control valve 133 is at the second position, the seventh interface 1331 is connected to the ninth interface 1333, and at this time, the second pump body 1122 of the pump station 112 can enable the working medium in the hydraulic oil tank 111 to sequentially pass through the second multi-way valve 122, the seventh interface 1331, and the ninth interface 1333, and enter the second rod chamber 1421.

In other words, when the second pilot-controlled direction valve 132 is in the first position and the third pilot-controlled direction valve 133 is in the first position, the first driving member 141 is in the working state. When the second pilot operated directional control valve 132 is in the second position and the third pilot operated directional control valve 133 is in the second position, the second driving member 142 is in the operating state.

In the technical scheme defined by the invention, the driving piece is driven by the hydraulic system 100, and compared with a manual driving mode or a motor driving mode, the hydraulic system has the advantages of simple structure, high sensitivity, easiness in accurate positioning and capability of improving the working efficiency and the safety performance. The first driving part 141 is used for tunneling work, the second driving part 142 is used for supporting work, a branch oil path is additionally arranged on a hydraulic oil path of the first driving part 141 to control the second driving part 142, function switching of tunneling and supporting work is achieved, and when the second driving part 142 is in a working state, the first driving part 141 is in a locking state. In addition, through addding first pilot-controlled directional control valve 131, when realizing strutting the operation, star gear, fortune motor are in the locking state, avoid causing personnel's injury or equipment damage because of the maloperation.

In another embodiment, the first multiplex valve is a triple multiplex valve. Through setting up the multiple unit valve of first ally oneself with to the multiple unit valve of trigeminy, the multiple unit valve of first ally oneself with can be connected with left star wheel motor, right star wheel motor and a fortune motor etc..

In another embodiment, the second multiplex valve is a seven-way multiplex valve. The second multi-way valve is used for being connected with the shovel plate lifting driving piece, the cutting head rotary driving piece, the cutting head telescopic driving piece, the rear supporting driving piece, the left walking driving piece, the right walking driving piece and the like.

Example two

As shown in fig. 1, the first port 1311 of the first pilot-controlled directional control valve 131 is connected to a load-sensitive oil port 1212 (LS port) of the first multiplex valve 121, the second port 1312 of the first pilot-controlled directional control valve 131 is connected to a control oil port of the pump station 112, and the third port 1313 of the first pilot-controlled directional control valve 131 is connected to the hydraulic oil tank 111. When the engineering machine 200 is in a tunneling state, the first hydraulic control directional control valve 131 is in a first station (the first interface 1311 is connected with the second interface 1312), and the feedback oil path sequentially passes through the load-sensitive oil port 1212, the first interface 1311, the second interface 1312 and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multi-connection multi-way valve 121, and then the first multi-connection multi-way valve 121 distributes the working medium to driving members such as a left star wheel motor, a right star wheel motor, or a transport motor. It can be understood that when the first pilot-controlled directional control valve 131 is in the first station, the driving members such as the left star wheel motor, the right star wheel motor, or the first motion motor are in the working state; when the engineering machine 200 performs a supporting operation, the first pilot-controlled directional control valve 131 is located at the second station (the first port 1311 is connected to the third port 1313), and the feedback oil path sequentially passes through the load-sensitive oil port 1212, the first port 1311, the third port 1313, and the hydraulic oil tank 111. The control oil port of the first pump body 1121 does not receive the working medium of the feedback oil path, and at this time, the first pump body 1121 does not pump the working medium to the first multi-gang multi-way valve 121. It can be understood that when the first pilot-controlled directional control valve 131 is in the second position, the driving members such as the left star wheel motor, the right star wheel motor, or a motion motor are in the locked state.

In the technical scheme defined by the invention, the first hydraulic control reversing valve 131 is added on the LS feedback oil path of the first multi-connection multi-way valve 121, so that the star wheel and the first conveying motor are locked during supporting operation, and personnel injury and equipment damage caused by misoperation are avoided. The first hydraulic control directional control valve 131 changes the station to change the LS oil path of the first multi-unit multi-way valve 121, and the front pump (the first pump body 1121) originally fed back to the pump station 112 is changed into the return hydraulic oil tank 111, because the plunger pump adopted by the hydraulic system 100 of the present invention is a load-sensitive pump, when there is no LS oil path feedback, the swash plate tilt angle of the front pump is the minimum angle, and the front pump has no flow output, so when the star wheel and the first transport pilot handle 171 are pushed, the star wheel and the first transport have no action, that is, the locking of the star wheel and the first transport motor when the joist 210 works is realized.

EXAMPLE III

As shown in fig. 1, when the second hydraulic directional control valve 132 is in the first working position (the fourth port 1321 is connected to the fifth port 1322), the second pump body 1122 of the pumping station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the fourth port 1321 and the fifth port 1322 to enter the first rod chamber 1412; when the second hydraulic directional control valve 132 is at the second position (the fourth port 1321 is connected to the sixth port 1323), the second pump body 1122 of the pump station 112 can make the working medium in the hydraulic oil tank 111 sequentially pass through the second multi-connection multi-way valve 122, the fourth port 1321 and the sixth port 1323, and enter the second rodless chamber 1422. When the third pilot-controlled directional control valve 133 is at the first position (the seventh interface 1331 is connected to the eighth interface 1332), the second pump body 1122 of the pump station 112 can enable the working medium in the hydraulic oil tank 111 to sequentially pass through the second multi-way valve 122, the seventh interface 1331 and the eighth interface 1332, and then enter the first rod chamber 1411; when the third pilot-controlled directional valve 133 is in the second position (the seventh port 1331 is connected to the ninth port 1333), the second pump body 1122 of the pump station 112 can enable the working medium in the hydraulic oil tank 111 to sequentially pass through the second multi-connection multi-way valve 122, the seventh port 1331 and the ninth port 1333, and then enter the second rod chamber 1421.

Example four

As shown in fig. 1 and 2, the hydraulic system 100 further includes a governor valve pack 150. Specifically, the sixth port 1323 is connected to the second rodless chamber 1422 through the first fluid path 181, and the speed control valve group 150 is disposed on the first fluid path 181. The second multi-way valve 122 is a proportional valve, which can adjust the movement speed of the driving member, but the pressure and flow of the multi-way valve are adjusted in advance, so that the speed adjusting range of the second driving member 142 is limited, and the requirement for fine positioning after the joist 210 moves to the working position cannot be met. By additionally arranging the speed regulating valve group 150, the oil path of the oil cylinder of the joist device can be obviously reduced, so that the oil cylinder of the joist device can realize real-time speed regulation under lower pressure and flow, and further the aim of carrying out fine positioning after the joist device 210 moves to the position near the working position is fulfilled.

Further, the governor valve group 150 includes a manual directional valve 151 and a throttle valve 152. Specifically, the manual directional valve 151 has a tenth port 1511, an eleventh port 1512, and a twelfth port 1513. The tenth port 1511 of the manual directional valve 151 is connected with the sixth port 1323 of the second hydraulic directional valve 132; the eleventh interface 1512 of the manual reversing valve 151 is connected with the sixth interface 1323 of the second hydraulic control reversing valve 132; the twelfth port 1513 of the manual directional valve 151 is connected to the second rodless chamber 1422. The throttle valve 152 is provided at an eleventh interface 1512 of the manual directional valve 151. The twelfth interface 1513 is selectively connected with the tenth interface 1511 or the eleventh interface 1512.

Specifically, when the manual directional control valve 151 is in the left position, the twelfth port 1513 is connected to the tenth port 1511, the working medium sequentially passes through the sixth port 1323, the tenth port 1511, the twelfth port 1513 and the second rodless chamber 1422, and at this time, the movement speed of the second driving member 142 can be adjusted by controlling the opening degree of the handle assembly 170; when the manual reversing valve 151 is in the right position, the twelfth port 1513 is connected with the eleventh port 1512, the working medium sequentially passes through the sixth port 1323, the throttle valve 152, the eleventh port 1512, the twelfth port 1513 and the second rodless cavity 1422, and since the throttle valve 152 is arranged in the oil path and the throttle valve 152 plays a role of throttling, the low-speed working mode can be switched by pulling the manual reversing valve 151 to the right position. By the mode, the oil path of the second driving part 142 can be obviously reduced, so that the second driving part 142 can finish real-time speed regulation under lower pressure and flow, and the aim of fine positioning after the joist device 210 moves to the position near the working position is fulfilled.

EXAMPLE five

As shown in FIG. 1, the hydraulic system 100 also includes a shuttle valve 161, a handle assembly 170, and a pull valve 162. Specifically, the first multiple-connection/multiple-way valve 121 has a first pilot oil port 1213 (X port), and the second multiple-connection/multiple-way valve 122 has a second pilot oil port 1221 (X port). The shuttle valve 161 is connected to the first pilot oil port 1213, and the shuttle valve 161 is connected to the second pilot oil port 1221. By providing the shuttle valve 161, a function of pressure selection can be performed, and the passage of the working medium having a higher pressure is preferentially selected. Further, a handle assembly 170 is connected to the shuttle valve 161. Optionally, handle assembly 170 includes a connected pilot handle 171 and a four-way handle 172. Wherein the pilot handle 171 is used for controlling the forward and backward movement of the left travel driver; the pilot handle 171 is used to control the forward and backward movement of the right travel drive; the pilot handle 171 is used to control the extension and retraction of the rear support drive; a pilot handle 171 for controlling the lowering and raising of the blade lift drive; the pilot handle 171 is used for controlling the forward rotation and the reverse rotation of a motor; the pilot handle 171 is used to control the forward rotation and reverse rotation of the star wheel motor. In addition, a four-way handle 172 is used to control the raising and lowering of the cutter head lifting drive; a four-way handle 172 is used to control the left and right rotation of the cutter head rotary drive. Further, the pull-out valve 162 is connected to the shuttle valve 161, the pull-out valve 162 is connected to the first pilot operated directional control valve 131, the pull-out valve 162 is connected to the second pilot operated directional control valve 132, and the pull-out valve 162 is connected to the third pilot operated directional control valve 133. The drawing valve 162 controls the opening and closing of the first oil path, and after the station of the drawing valve 162 is switched, the first hydraulic control directional valve 131, the second hydraulic control directional valve 132 and the third hydraulic control directional valve 133 can be restored to the original positions.

Further, the hydraulic system 100 also includes a balancing valve 163. Specifically, the balancing valve 163 is connected to the second hydraulic directional control valve 132, and the balancing valve 163 is connected to the first driver 141; and/or the balancing valve 163 is connected with the third pilot-controlled directional control valve 133, and the balancing valve 163 is connected with the second driver 142. By providing the balancing valve 163, the flow resistance through the valve can be changed to adjust the flow rate. Typically, there is a large pressure or flow difference between the media in various sections of the pipe or vessel, and the balancing valve 163 can reduce or balance the pressure difference to adjust the relative balance of the pressures on the two sides, or to balance the flow by splitting.

Example six

As shown in fig. 1, the pumping station 112 includes at least two connected pump bodies, the number of the pump bodies is at least two, that is, two or more pump bodies may be provided, and the pump bodies are flexibly arranged according to actual requirements. At least one pump body is connected with the first multi-way valve 121, and the pump body is connected with the first hydraulic control reversing valve 131; at least one pump body is connected with a second multiplex valve 122. Optionally, pump station 112 includes a first pump body 1121 and a second pump body 1122 that are connected. The first pump body 1121 has an oil outlet and a control port. The first multi-way valve 121 has an oil inlet 1211 and a load sensing oil port 1212. An oil outlet of the first pump body 1121 is connected to an oil inlet 1211 of the first multi-way valve 121. The load-sensitive port 1212 is connected to the first port 1311. The second interface 1312 is connected to the control oil port of the first pump body 1121. When the first pilot-controlled directional control valve 131 is in the first station, the first interface 1311 is connected with the second interface 1312, and the feedback oil path sequentially passes through the load-sensitive oil port 1212, the first interface 1311, the second interface 1312 and the control oil port. After the control oil port receives the working medium of the feedback oil path, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multiple multi-way valve 121, and then the first multiple multi-way valve 121 distributes the working medium to driving members such as the left star wheel motor, the right star wheel motor, or a motion motor. In addition, the second pump body 1122 can pump the working medium in the hydraulic oil tank 111 to the second multi-way valve 122, and then the working medium is distributed to the driving elements by the second multi-way valve 122.

EXAMPLE seven

As shown in fig. 1 and 2, the hydraulic system 100 provided by the invention can realize interlocking of supporting and tunneling operation. Specifically, when the joist device 210 is ready to be used for a shoring operation, the pilot oil source is pressure-selected by the shuttle valve 161 from the port X (pilot oil port) of the seven-way multiplex valve (second multiplex valve 122) and the triple multiplex valve (first multiplex valve 121), and then is sent to the pilot handle 171, the four-way handle 172, and the pull valve 162 in parallel. By pulling the pulling valve 162 with the positioning function, the pilot oil path of the pilot-controlled directional control valve (including the first pilot-controlled directional control valve 131, the second pilot-controlled directional control valve 132, and the third pilot-controlled directional control valve 133) can be communicated with the X port of the multi-way valve and pressure is built, and the spool is pushed to change the direction of the pilot-controlled directional control valve. The second hydraulic control directional control valve 132 and the third hydraulic control directional control valve 133 change the communication elements of the fourth oil ports a and B of the seven-way valve (the second multi-way valve 122) from the cutting telescopic cylinder (the first driving element 141) to the joist device cylinder (the second driving element 142). At this time, the pilot handle 171 corresponding to the cutting extension is pushed, the joist device oil cylinder starts to act to perform supporting operation, and the cutting extension oil cylinder is kept at the current stroke position under the action of the balance valve 163. Meanwhile, the first hydraulic control reversing valve 131 reverses the LS oil path of the triple multi-way valve, and the original front pump (the first pump body 1121) fed back to the pump station 112 is changed into the return hydraulic oil tank 111, and because the plunger pump adopted by the hydraulic system 100 of the present invention is a load-sensitive pump, when there is no LS oil path feedback, the swash plate tilt angle of the front pump is the minimum angle, and the front pump has no flow output, so when the star wheel and the first transport pilot handle 171 are pushed, the star wheel and the first transport have no action, that is, the locking of the star wheel and the first transport motor during the operation of the joist 210 is realized.

The speed regulating valve group 150 is additionally arranged on an oil way of a rodless cavity (a second rodless cavity 1422) of the oil cylinder of the joist device to realize real-time speed regulation of the joist device 210 so as to meet different working conditions. When oil enters the second rodless chamber 1422, high-pressure oil is sent out from the pumping station 112, enters the second hydraulic control directional control valve 132 and the balance valve 163 through the fourth of the seven-way multi-way valve, and then enters the speed regulating valve group 150. When the manual directional valve 151 in the speed regulating valve group 150 is in the left position, the oil flows into the rodless cavity of the joist device oil cylinder through the manual directional valve 151, and because the control mode of the pilot handle 171 adopted by the system is proportional control, the movement speed of the joist device oil cylinder can be regulated by adjusting the opening degree of the pilot handle 171, but because the pressure and the flow of the multi-way valve are debugged in advance, the speed regulating range of the joist device oil cylinder has certain limitation, and the precise positioning requirement of the joist device 210 after moving to the working position cannot be met. The low-speed working mode can be switched to by pulling the manual reversing valve 151 to the right position, at the moment, the manual reversing valve 151 in the speed regulating valve group 150 is switched to the right position, oil flows into a rodless cavity of the joist device oil cylinder after being throttled by the throttle valve 152, and by the mode, the oil path of the joist device oil cylinder (the second driving part 142) can be obviously reduced, so that the joist device oil cylinder can carry out real-time speed regulation under lower pressure and flow, and further, the joist device 210 can be precisely positioned after moving to the position near the working position.

In the technical scheme defined by the invention, on one hand, the hydraulic system can be transformed on the basis of the existing hydraulic system 100, so that the real-time speed regulation of the joist device 210 is realized, and the supporting and tunneling operations are interlocked; on the other hand, the movement speed of the joist device 210 can be adjusted in real time on the premise that the flow and the pressure of the multi-way valve do not need to be adjusted, and the joist device 210 can adjust the movement speed in real time in a low-speed or high-speed mode; moreover, when the joist device 210 is used for supporting operation, the star wheel, the first transportation and the cutting are locked in a telescopic mode, the executing element does not move, and personnel injury and equipment damage caused by factors such as misoperation are avoided.

Example eight

As shown in fig. 3, a working machine 200 according to an embodiment of the present invention includes the hydraulic system 100 and the joist machine 210 in any of the above embodiments. The joist 210 is connected to the second drive 142 of the hydraulic system 100. Optionally, the work machine 200 further comprises a cutting section, a star wheel motor and a conveyor motor. The cutting part is connected with the first driving part 141; the star wheel motor is connected with the first multi-way valve 121; a motor and a first multiplex valve 121.

It should be noted that the working machine 200 may be a heading machine or the like.

According to the embodiment of the hydraulic system and the engineering machinery, the driving piece is driven by the hydraulic system, and compared with a manual driving mode or a motor driving mode, the hydraulic system and the engineering machinery have the advantages that the structure is simple, the sensitivity is high, the accurate positioning is easy, and the working efficiency and the safety performance can be improved. The first driving piece is used for tunneling work, the second driving piece is used for supporting work, a branch oil way is additionally arranged on a hydraulic oil way of the first driving piece to control the second driving piece, the function switching of tunneling and supporting work is realized, and when the second driving piece is in a working state, the first driving piece is in a locking state. In addition, through add first liquid accuse switching-over valve, when realizing strutting the operation, star gear, fortune motor are in the locking state, avoid causing personnel's injury or equipment damage because of the maloperation.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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. A hydraulic system, comprising:

a hydraulic oil tank (111);

a pump station (112) connected to the hydraulic oil tank (111);

the first multi-way valve (121) is connected with the pump station (112);

the second multi-way valve (122) is connected with the pumping station (112);

the first hydraulic control reversing valve (131) is connected with the first multi-connection multi-way valve (121), the first hydraulic control reversing valve (131) is connected with the pump station (112), the first hydraulic control reversing valve (131) is connected with the hydraulic oil tank (111), when the first hydraulic control reversing valve (131) is located at a first station, the first multi-connection multi-way valve (121) is communicated with the pump station (112), and when the first hydraulic control reversing valve (131) is located at a second station, the first multi-connection multi-way valve (121) is communicated with the hydraulic oil tank (111);

the second hydraulic control reversing valve (132) is connected with the second multiplex valve (122);

the third hydraulic control reversing valve (133) is connected with the second multi-connection multi-way valve (122);

the first driving piece (141) is connected with the second hydraulic control reversing valve (132), the first driving piece (141) is connected with the third hydraulic control reversing valve (133), and when the second hydraulic control reversing valve (132) is in a first working position and the third hydraulic control reversing valve (133) is in the first working position, the first driving piece (141) is in a working state;

and the second driving piece (142) is connected with the third hydraulic control reversing valve (133), the second driving piece (142) is connected with the second hydraulic control reversing valve (132), and when the second hydraulic control reversing valve (132) is in a second working position and the third hydraulic control reversing valve (133) is in the second working position, the second driving piece (142) is in a working state.

2. The hydraulic system as claimed in claim 1, wherein the first multiple-unit multi-way valve (121) is provided with an oil inlet (1211) and a load-sensitive oil port (1212), the first hydraulic control directional control valve (131) is provided with a first interface (1311), a second interface (1312) and a third interface (1313), the first interface (1311) is connected with the load-sensitive oil port (1212), the second interface (1312) is connected with the pump station (112), the third interface (1313) is connected with the hydraulic oil tank (111), the first interface (1311) is selectively connected with the second interface (1312) or the third interface (1313), and when the first hydraulic control directional control valve (131) is in a first station, the first interface (1) is connected with the second interface (1312); when the first hydraulic control reversing valve (131) is in the second working position, the first interface (1311) is connected with the third interface (1313).

3. The hydraulic system of claim 1, wherein the first actuating member (141) is a first cylinder having a first rod chamber (1411) and a first rodless chamber (1412), and the second actuating member (142) is a second cylinder having a second rod chamber (1421) and a second rodless chamber (1422);

the second hydraulic control directional control valve (132) is provided with a fourth interface (1321), a fifth interface (1322) and a sixth interface (1323), the fourth interface (1321) is connected with the second multiplex valve (122), the fifth interface (1322) is connected with the first rodless chamber (1412), the sixth interface (1323) is connected with the second rodless chamber (1422), the fourth interface (1321) is selectively connected with the fifth interface (1322) or the sixth interface (1323), and the fourth interface (1321) is connected with the fifth interface (1322) when the second hydraulic control directional control valve (132) is in the first working position; when the second hydraulic control reversing valve (132) is in the second working position, the fourth port (1321) is connected with the sixth port (1323);

the third pilot-controlled directional control valve (133) is provided with a seventh interface (1331), an eighth interface (1332) and a ninth interface (1333), the seventh interface (1331) is connected with the second multiplex multi-way valve (122), the eighth interface (1332) is connected with the first rod chamber (1411), the ninth interface (1333) is connected with the second rod chamber (1421), the seventh interface (1331) is selectively connected with the eighth interface (1332) or the ninth interface (1333), and the seventh interface (1331) is connected with the eighth interface (1332) when the third pilot-controlled directional control valve (133) is in the first working position; when the third hydraulic control reversing valve (133) is in the second working position, the seventh interface (1331) is connected with the ninth interface (1333).

4. The hydraulic system of claim 3, wherein the sixth interface (1323) is connected to the second rodless chamber (1422) by a first fluid path (181), the hydraulic system (100) further comprising:

and the speed regulating valve group (150) is arranged on the first liquid path (181).

5. The hydraulic system of claim 4, wherein the governor valve block (150) comprises:

a manual directional valve (151) having a tenth port (1511), an eleventh port (1512), and a twelfth port (1513), the tenth port (1511) being connected to the sixth port (1323), the eleventh port (1512) being connected to the sixth port (1323), the twelfth port (1513) being connected to the second rodless chamber (1422), the twelfth port (1513) being selectively connected to the tenth port (1511) or the eleventh port (1512);

the throttling valve (152) is arranged at the eleventh interface (1512), and when the twelfth interface (1513) is connected with the tenth interface (1511), a working medium sequentially passes through the sixth interface (1323), the tenth interface (1511), the twelfth interface (1513) and the second rodless cavity (1422); when the twelfth interface (1513) is connected with the eleventh interface (1512), the working medium sequentially passes through the sixth interface (1323), the throttle valve (152), the eleventh interface (1512), the twelfth interface (1513), and the second rodless chamber (1422).

6. The hydraulic system as claimed in any one of claims 1 to 5, wherein the first multiplex valve (121) has a first pilot oil port (1213), the second multiplex valve (122) has a second pilot oil port (1221), and the hydraulic system (100) further comprises:

the shuttle valve (161) is connected with the first pilot oil port (1213), and the shuttle valve (161) is connected with the second pilot oil port (1221);

a handle assembly (170) connected to the shuttle valve (161);

the drawing valve (162) is connected with the shuttle valve (161), the drawing valve (162) is connected with the first hydraulic control reversing valve (131), the drawing valve (162) is connected with the second hydraulic control reversing valve (132), and the drawing valve (162) is connected with the third hydraulic control reversing valve (133).

7. The hydraulic system of any one of claims 1-5, further comprising:

a balancing valve (163) connected to the second hydraulically controlled directional valve (132), and the balancing valve (163) connected to the first drive (141); and/or the balancing valve (163) is connected with the third pilot operated directional control valve (133), and the balancing valve (163) is connected with the second driver (142).

8. The hydraulic system of claim 6, wherein the handle assembly (170) includes a connected pilot handle (171) and a four-way handle (172).

9. A hydraulic system according to any one of claims 1-5, characterized in that the pump station (112) comprises at least two connected pump bodies, at least one of which is connected to the first multiplex valve (121) and which is connected to the first hydraulically controlled directional control valve (131); at least one pump body is connected with the second multiplex valve (122).

10. A work machine, comprising:

a hydraulic system as claimed in any one of claims 1 to 9;

a joist device (210) connected with a second driving member (142) of the hydraulic system.