阅读说明：本技术 浮动液压系统及工程机械 (Floating hydraulic system and engineering machinery ) 是由 黄海楠 吴亮 郑乾坤 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种浮动液压系统及工程机械,涉及液压控制技术领域。该浮动液压系统包括液压缸、驱动控制组件、液压锁组件、浮动控制组件,液压缸用于连接推土铲,以带动推土铲升降,驱动控制组件通过两条驱动油路分别与液压缸的两个油口连接,以控制液压缸伸缩,液压锁组件包括锁定控制阀,锁定控制阀设置于与液压缸的无杆腔连接的驱动油路上,并用于限制液压油由液压缸的无杆腔流出或解除限制,浮动控制组件包括浮动控制阀,浮动控制阀通过两条浮动油路分别与两条驱动油路连接,且浮动控制阀能够连通或断开两条浮动油路。该浮动液压系统及工程机械具有能够实现推土铲的位置锁定、浮动控制及高度短暂调整的特点。(The invention discloses a floating hydraulic system and engineering machinery, and relates to the technical field of hydraulic control. The floating hydraulic system comprises a hydraulic cylinder, a drive control assembly, a hydraulic lock assembly and a floating control assembly, wherein the hydraulic cylinder is used for connecting a dozer blade to drive the dozer blade to lift, the drive control assembly is respectively connected with two oil ports of the hydraulic cylinder through two drive oil ways to control the hydraulic cylinder to stretch, the hydraulic lock assembly comprises a locking control valve, the locking control valve is arranged on a drive oil way connected with a rodless cavity of the hydraulic cylinder and used for limiting hydraulic oil to flow out or relieve limitation through the rodless cavity of the hydraulic cylinder, the floating control assembly comprises a floating control valve, the floating control valve is respectively connected with the two drive oil ways through the two floating oil ways, and the floating control valve can be communicated with or disconnected with the two floating oil. The floating hydraulic system and the engineering machinery have the characteristics of realizing position locking, floating control and short height adjustment of the dozer blade.)

1. A floating hydraulic system is characterized by comprising a hydraulic cylinder (11), a drive control assembly (12), a hydraulic lock assembly (13), a floating control assembly (15), two drive oil ways (121) and two floating oil ways (151);

the hydraulic cylinder (11) is used for connecting a dozer blade so as to drive the dozer blade to lift;

the driving control assembly (12) is respectively connected with two oil ports of the hydraulic cylinder (11) through two driving oil ways (121) so as to control the hydraulic cylinder (11) to stretch;

the hydraulic lock assembly (13) comprises a locking control valve (131), and the locking control valve (131) is arranged on the driving oil path (121) connected with the rodless cavity of the hydraulic cylinder (11) and is used for limiting hydraulic oil to flow out of the rodless cavity of the hydraulic cylinder (11) or releasing the limitation;

the floating control assembly (15) comprises a floating control valve (153), the floating control valve (153) is respectively connected with the two driving oil passages (121) through the two floating oil passages (151), and the floating control valve (153) can connect or disconnect the two floating oil passages (151).

2. The floating hydraulic system according to claim 1, wherein the locking control valve (131) is a pilot operated check valve (1311), and the pilot operated check valve (1311) is configured to conduct the corresponding driving oil passage (121) in a one-way direction toward the hydraulic cylinder (11) and to conduct when hydraulic oil is injected into a pilot control oil port (1312) of the pilot operated check valve (1311).

3. The floating hydraulic system of claim 2, wherein the floating control valve (153) has a floating closed position (1531) and a floating open position (1532), and the floating control valve (153) is switchable to the floating open position (1532) upon receiving a floating control signal, automatically resetting to the floating closed position (1531) in the absence of the floating control signal;

when the floating control valve (153) is located at the floating opening position (1532), the two floating oil passages (151) can be communicated; when the floating closing position (1531) is located, the floating control valve (153) can disconnect the two floating oil passages (151).

4. The floating hydraulic system according to claim 3, characterized in that the floating hydraulic system (10) further comprises a floating pilot oil passage (152), the floating pilot oil passage (152) being connected to the pilot control oil port (1312) and being used for injecting the hydraulic oil to the pilot control oil port (1312);

the floating control valve (153) is further arranged on the floating pilot oil path (152), and when the floating control valve (153) is located at the floating opening position (1532), the floating pilot oil path (152) can be conducted by the floating control valve (153); the floating control valve (153) is also capable of disconnecting the floating pilot oil passage (152) when in the floating closed position (1531).

5. The floating hydraulic system according to claim 4, wherein the drive control assembly (12) includes a hydraulic pump (122) and a drive control valve (123) connected to each other, and the drive control valve (123) is connected to the two drive oil passages (121) to communicate either one of the drive oil passages (121) with the hydraulic pump (122) or to disconnect the two drive oil passages (121).

6. The floating hydraulic system according to claim 5, wherein the drive control assembly (12) further comprises a first control oil path (1221) and a second control oil path (1222), the first control oil path (1221) and the second control oil path (1222) are both connected with the drive control valve (123), and the second control oil path (1222) is further connected with the pilot control oil port (1312), the two drive oil paths (121) are a first drive oil path (1211) and a second drive oil path (1212), respectively, wherein the first drive oil path (1211) is connected with the rodless cavity of the hydraulic cylinder (11);

the first control oil passage (1221) is used for controlling the drive control valve (123) to communicate the first drive oil passage (1211) and the hydraulic pump (122) when the hydraulic oil is injected; the second control oil path (1222) is used for controlling the drive control valve (123) to communicate the second drive oil path (1212) and the hydraulic pump (122) when the hydraulic oil is injected, and simultaneously controlling the pilot operated check valve (1311) to be communicated.

7. The floating hydraulic system of claim 6, wherein the actuation control valve (123) has a first actuation position (1231), an actuation closed position (1233), and a second actuation position (1232);

when the first control oil passage (1221) is filled with the hydraulic oil, the drive control valve (123) can be switched to a first drive position (1231) and communicate the first drive oil passage (1211) and the hydraulic pump (122); when the second control oil passage (1222) is filled with the hydraulic oil, the drive control valve (123) can be switched to a second drive position (1232) and communicate the second drive oil passage (1212) and the hydraulic pump (122); when the first control oil passage (1221) and the second control oil passage (1222) are not filled with hydraulic oil, the drive control valve (123) can be switched to a drive closing position (1233) and disconnect the hydraulic pump (122) from the first drive oil passage (1211) and the second drive oil passage (1212).

8. The floating hydraulic system of claim 6, wherein the drive control assembly (12) further comprises a first shuttle valve (125) and a pressure sensor (126), the first shuttle valve (125) having a first control port (1251), a second control port (1252) and a third control port (1253), the first and second control oil passages (1221, 1222) being connected to the first and second control ports (1251, 1252), respectively, and the pressure sensor (126) being connected to the third control port (1253);

the floating control assembly (15) further comprises a floating switch (155) and a cut-off switch (156), the floating control valve (153), the cut-off switch (156) and the floating switch (155) are electrically connected in sequence, the floating switch (155) is used for responding to the operation of a user and sending the floating control signal to the floating control valve (153) through the cut-off switch (156), and the cut-off switch (156) is also electrically connected with the pressure sensor (126);

when the first control oil path (1221) is filled with hydraulic oil, the first shuttle valve (125) can close the second control oil port (1252) and communicate the first control oil port (1251) and the third control oil port (1253);

when the second control oil path (1222) is filled with hydraulic oil, the first shuttle valve (125) can close the first control oil port (1251) and communicate the second control oil port (1252) and the third control oil port (1253);

the pressure sensor (126) can generate a disconnection signal when detecting that the pressure of the third control oil port (1253) is increased, and the circuit breaker (156) can be disconnected after receiving the disconnection signal so as to disconnect the electric connection between the floating control valve (153) and the floating switch (155).

9. The floating hydraulic system of claim 6, wherein the hydraulic lock assembly (13) further comprises a second shuttle valve (132), the second shuttle valve (132) having a first floating oil port (1321), a second floating oil port (1322), and a third floating oil port (1323);

the second control oil passage (1222) is connected to the first floating oil port (1321), the floating oil passage (151) is connected to the second floating oil port (1322), and the pilot oil port (1312) is connected to the third floating oil port (1323);

when the second control oil path (1222) is filled with hydraulic oil, the second shuttle valve (132) closes the second floating oil port (1322), and communicates the first floating oil port (1321) and the third floating oil port (1323) to control the pilot check valve (1311) to be communicated;

when the floating oil path (151) is filled with hydraulic oil, the second shuttle valve (132) closes the first floating oil port (1321) and communicates the second floating oil port (1322) and the third floating oil port (1323), so that the pilot operated check valve (1311) is controlled to be communicated.

10. A working machine, characterized in that it comprises a floating hydraulic system (10) according to any one of claims 1-9.

Technical Field

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

Background

At present, the application of a dozer blade is very common in various engineering machines, and common devices with the dozer blade comprise an excavator, a loader and the like. These work machines can be used to quickly level the ground.

When they perform earth moving work, they require the blade to be closely attached to the ground, but the following occurs due to the difference in the flatness of the ground: when the bulldozer performs bulldozing operation on a flat ground, the bulldozer only needs to be arranged at a certain height for the bulldozer to closely attach to the ground, but the bulldozer needs to be provided with a hydraulic lock for stable operation; when earth moving is carried out on concave-convex ground, the earth moving blade is required to have a floating function in order to be tightly attached to the ground; when earth moving is performed on the ground of a step, the height of the blade needs to be adjusted for a short time in order to perform normal work. However, the existing hydraulic system is difficult to satisfy the three situations.

In view of the above, it is important to develop a floating hydraulic system and an engineering machine that can solve the above technical problems.

Disclosure of Invention

The invention aims to provide a floating hydraulic system which has the characteristics of realizing the position locking, floating control and short height adjustment of a dozer blade.

Another object of the present invention is to provide a construction machine which also has the feature of being able to achieve position locking, floating control and short height adjustment of the blade.

The invention provides a technical scheme that:

in a first aspect, an embodiment of the present invention provides a floating hydraulic system, including a hydraulic cylinder, a drive control assembly, a hydraulic lock assembly, a floating control assembly, two drive oil paths, and two floating oil paths; the hydraulic cylinder is used for connecting the dozer blade so as to drive the dozer blade to lift; the driving control assembly is respectively connected with the two oil ports of the hydraulic cylinder through the two driving oil ways so as to control the hydraulic cylinder to stretch; the hydraulic lock assembly comprises a locking control valve, and the locking control valve is arranged on the driving oil path connected with the rodless cavity of the hydraulic cylinder and is used for limiting hydraulic oil to flow out of the rodless cavity of the hydraulic cylinder or relieving the limitation; the floating control assembly comprises a floating control valve, the floating control valve is respectively connected with the two driving oil ways through the two floating oil ways, and the floating control valve can be used for communicating or disconnecting the two floating oil ways.

With reference to the first aspect, in a first implementation manner of the first aspect, the locking control valve is a hydraulic control check valve, and the hydraulic control check valve is configured to conduct the corresponding driving oil path in a one-way manner in a direction toward the hydraulic cylinder and is configured to conduct when hydraulic oil is injected into a pilot control oil port of the hydraulic control check valve.

With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, the floating control valve has a floating closing position and a floating opening position, and the floating control valve can be switched to the floating opening position when receiving a floating control signal and automatically reset to the floating closing position when the floating control signal is not received; when the floating control valve is positioned at the floating opening position, the floating control valve can be communicated with the two floating oil passages; and when the floating closed position is achieved, the floating control valve can disconnect the two floating oil passages.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, the floating hydraulic system further includes a floating pilot oil path, and the floating pilot oil path is connected to the pilot control oil port and is used for injecting the hydraulic oil into the pilot control oil port; the floating control valve is also arranged on the floating pilot oil way, and when the floating control valve is positioned at the floating opening position, the floating control valve can also conduct the floating pilot oil way; when the floating control valve is located at the floating closing position, the floating control valve can also disconnect the floating pilot oil way.

With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, the drive control assembly includes a hydraulic pump and a drive control valve that are connected to each other, and the drive control valve is connected to the two drive oil paths to communicate any one of the drive oil paths with the hydraulic pump or to disconnect the two drive oil paths.

With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the drive control assembly further includes a first control oil path and a second control oil path, the first control oil path and the second control oil path are both connected to the drive control valve, the second control oil path is further connected to the pilot control oil port, the two drive oil paths are respectively a first drive oil path and a second drive oil path, and the first drive oil path is connected to the rodless cavity of the hydraulic cylinder; the first control oil path is used for controlling the drive control valve to communicate the first drive oil path and the hydraulic pump when the hydraulic oil is injected; and the second control oil path is used for controlling the drive control valve to communicate the second drive oil path with the hydraulic pump and simultaneously controlling the hydraulic control one-way valve to be communicated when the hydraulic oil is injected.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the drive control valve has a first drive position, a drive closed position, and a second drive position; when the first control oil path is filled with the hydraulic oil, the driving control valve can be switched to a first driving position and is communicated with the first driving oil path and the hydraulic pump; when the second control oil path is filled with the hydraulic oil, the driving control valve can be switched to a second driving position and is communicated with the second driving oil path and the hydraulic pump; when the first control oil path and the second control oil path are not filled with hydraulic oil, the drive control valve can be switched to a drive closed position, and the hydraulic pump is disconnected from the first drive oil path and the second drive oil path.

With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, the driving control assembly further includes a first shuttle valve and a pressure sensor, the first shuttle valve has a first control oil port, a second control oil port and a third control oil port, the first control oil path and the second control oil path are respectively connected to the first control oil port and the second control oil port, and the pressure sensor is connected to the third control oil port; the floating control assembly further comprises a floating switch and a circuit breaker, the floating control valve, the circuit breaker and the floating switch are electrically connected in sequence, the floating switch is used for responding to the operation of a user and sending the floating control signal to the floating control valve through the circuit breaker, and the circuit breaker is also electrically connected with the pressure sensor; when the first control oil path is filled with hydraulic oil, the first shuttle valve can close the second control oil port and communicate the first control oil port and the third control oil port, and the pressure sensor can generate a disconnection signal when detecting that the pressure of the third control oil port is increased; when the second control oil path is filled with hydraulic oil, the first shuttle valve can close the first control oil port and communicate the second control oil port and the third control oil port, and the pressure sensor can generate a disconnection signal when detecting that the pressure of the third control oil port is increased; the circuit breaker can be disconnected after receiving the disconnection signal so as to disconnect the electric connection between the floating control valve and the floating switch.

With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, the hydraulic lock assembly further includes a second shuttle valve, and the second shuttle valve has a first floating oil port, a second floating oil port, and a third floating oil port; the second control oil way is connected to the first floating oil port, the floating oil way is connected to the second floating oil port, and the pilot control oil port is connected with the third floating oil port; when the second control oil path is filled with hydraulic oil, the second shuttle valve closes the second floating oil port and communicates the first floating oil port and the third floating oil port to control the conduction of the hydraulic control one-way valve; when the floating oil way is filled with hydraulic oil, the second shuttle valve closes the first floating oil port and communicates the second floating oil port with the third floating oil port to control the conduction of the hydraulic control one-way valve.

In a second aspect, the embodiment of the invention further provides a working machine, which comprises the floating hydraulic system. The floating hydraulic system comprises a hydraulic cylinder, a driving control assembly, a hydraulic lock assembly, a floating control assembly, two driving oil paths and two floating oil paths; the hydraulic cylinder is used for connecting the dozer blade so as to drive the dozer blade to lift; the driving control assembly is respectively connected with the two oil ports of the hydraulic cylinder through the two driving oil ways so as to control the hydraulic cylinder to stretch; the hydraulic lock assembly comprises a locking control valve, and the locking control valve is arranged on the driving oil path connected with the rodless cavity of the hydraulic cylinder and is used for limiting hydraulic oil to flow out of the rodless cavity of the hydraulic cylinder or relieving the limitation; the floating control assembly comprises a floating control valve, the floating control valve is respectively connected with the two driving oil ways through the two floating oil ways, and the floating control valve can be used for communicating or disconnecting the two floating oil ways.

Compared with the prior art, the floating hydraulic system provided by the embodiment of the invention has the beneficial effects that:

the floating hydraulic system comprises a hydraulic cylinder, a driving control assembly, a hydraulic lock assembly, a floating control assembly, two driving oil ways and two floating oil ways, wherein the hydraulic cylinder is used for connecting the dozer blade so as to drive the dozer blade to lift through stretching and retraction and adjust the height of the dozer blade; and the hydraulic lock assembly comprises a locking control valve, the locking control valve is arranged on the driving oil path connected with the rodless cavity of the hydraulic cylinder, and the locking control valve is used for limiting hydraulic oil to flow out from the rodless cavity of the hydraulic cylinder, so that when the driving control assembly does not control the hydraulic cylinder to stretch through the two driving oil paths, the hydraulic oil in the rodless cavity of the hydraulic cylinder is locked under the limiting action of the locking control valve, the extending amount of the hydraulic cylinder is locked, and the height of the soil pushing shovel is kept. In addition, the floating control assembly comprises a floating control valve, the floating control valve is respectively connected with the two driving oil ways through the two floating oil ways, and the floating control valve can be communicated with the two floating oil ways so as to connect the rodless cavity and the rod cavity of the hydraulic cylinder, so that the dozer blade is in a floating state, and the floating control valve can also disconnect the two floating oil ways. Therefore, the hydraulic cylinder is locked by the locking control valve, so that the effect of locking the height of the dozer blade is achieved, the rodless cavity and the rod cavity are connected through the floating control valve, the hydraulic cylinder is in a floating state, the dozer blade is in the floating state, the height of the dozer blade is adjusted by adjusting the extending amount of the hydraulic cylinder through the driving control assembly, and the floating hydraulic system has the advantages of being capable of achieving position locking, floating control and short-time height adjustment of the dozer blade.

The beneficial effects of the engineering machine provided by the embodiment of the invention relative to the prior art are the same as the beneficial effects of the floating hydraulic system relative to the prior art, and are not described again.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic structural diagram of a floating hydraulic system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a hydraulic lock assembly of a floating hydraulic system according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a drive control assembly of the floating hydraulic system according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a floating control assembly of a floating hydraulic system according to an embodiment of the present invention.

Icon: 10-a floating hydraulic system; 11-a hydraulic cylinder; 111-rodless cavities; 112-a rod cavity; 12-a drive control assembly; 1211 — a first drive oil passage; 1212 — a second drive oil path; 121-driving oil path; 1221-first control oil circuit; 1222-a second control oil path; 122-a hydraulic pump; 123-drive control valve; 1231-first drive bit; 1233-drive closed; 1232-second drive bit; 125-a first shuttle valve; 1251-a first control port; 1252-a second control port; 1253-third control port; 126-a pressure sensor; 13-a hydraulic lock assembly; 131-a locking control valve; 1311-hydraulic control check valve; 1312-pilot control oil ports; 132-a second shuttle valve; 1321-a first floating oil port; 1322-a second floating oil port; 1323-a third floating oil port; 15-a float control assembly; 151-floating oil circuit; 152-floating pilot oil path; 153-a float control valve; 1531 — a floating closed position; 1532-Floating on bit; 155-a floating switch; 156-cut-off switch.

Detailed Description

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

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The terms "upper", "lower", "inner", "outer", "left", "right", and the like, refer to an orientation or positional relationship as shown in the drawings, or as would be conventionally found in use of the inventive product, or as would be conventionally understood by one skilled in the art, and are used merely to facilitate the description and simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following detailed description of embodiments of the invention refers to the accompanying drawings.