CN215890646U - Load-sensitive multi-way valve for land leveller - Google Patents
Load-sensitive multi-way valve for land leveller Download PDFInfo
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- CN215890646U CN215890646U CN202121966438.7U CN202121966438U CN215890646U CN 215890646 U CN215890646 U CN 215890646U CN 202121966438 U CN202121966438 U CN 202121966438U CN 215890646 U CN215890646 U CN 215890646U
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Abstract
A load-sensitive multi-way valve for a land leveler. The problems that an existing land leveler control valve is complex in structure, poor in sealing performance and prone to oil leakage among plates are solved. The hydraulic oil feeding device comprises a first valve block, a second valve block, a main oil inlet, an oil return port, a feedback oil port, a first working valve rod, a first working oil port, a first pressure compensator, a second working valve rod, a second working oil port and a second pressure compensator, wherein pressure oil of the main oil inlet is respectively connected with the oil inlets of the first working valve rod and the second working valve rod, the oil outlet of the first working valve rod is respectively connected with the first working oil port and the feedback oil port through the first pressure compensator, the oil outlet of the second working valve rod is respectively connected with the second working oil port and the feedback oil port through the second pressure compensator, and the first working connection group and the second working connection group are integrally formed through casting. The utility model also has the advantages of high integration degree, energy conservation, high efficiency, reliable operation, simple structure, convenient assembly and the like.
Description
Technical Field
The utility model relates to a hydraulic system for a land leveler, in particular to a load sensitive multi-way valve for a land leveler.
Background
The land leveler is a main machine used for shaping and leveling work in the earthwork, and is widely used for large-area ground leveling work of roads, airports and the like. A grader is an earth-moving machine that levels the ground with a blade. The scraper is arranged between the front wheel shaft and the rear wheel shaft of the machine and can lift, incline, rotate and extend outwards. The action is flexible and accurate, the operation is convenient, the leveling field has higher precision, and the device is suitable for constructing roadbed and road surface, building side slope, excavating side ditch, stirring road surface mixture, sweeping accumulated snow, pushing bulk material and maintaining the soil road and gravel road.
The land leveler is taken as an important component in engineering machinery, along with the increasingly violent market competition, the land leveler manufacturers are constantly improving the performance of a hydraulic system and reducing the production cost, most of the land levelers manufactured in China at present adopt a quantitative gear pump to be matched with a central multi-way valve, the composite action is poor, the structure of an operating mechanism is complex, the volume is large, the operation is inconvenient, the operating comfort level is poor, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a load-sensitive multi-way valve for a land leveler, which aims to solve the problems that the existing land leveler control valve in the background technology has a complex structure and poor sealing performance and oil is easy to leak among plates.
The technical scheme of the utility model is as follows: a load-sensitive multi-way valve for a land leveler comprises a first valve block, a second valve block, a main oil inlet, an oil return port and a feedback oil port, the first valve block is provided with a first working connection group and a second working connection group, the first working connection group comprises a first working valve rod, a first working oil port and a first pressure compensator, the second working union set comprises a second working valve rod, a second working oil port and a second pressure compensator, the pressure oil of the main oil inlet is respectively connected with the oil inlets of the first working valve rod and the second working valve rod, the oil outlet of the first working valve rod is respectively connected with the first working oil port and the feedback oil port through a first pressure compensator, the oil outlet of the second working valve rod is respectively connected with a second working oil port and a feedback oil port through a second pressure compensator, and the first working connection group and the second working connection group are integrally formed through casting.
As a further improvement of the present invention, the first working connection group includes two first working connections, and the two first working connections are disposed on two sides of the second working connection group.
As a further improvement of the present invention, the second working gang group includes at least five second working gang groups.
As a further improvement of the utility model, the second working connection group comprises a front wheel inclined second working connection, a hinged steering second working connection, a scraper knife swinging second working connection, a motor rotating second working connection, a scraper knife angle changing second working connection, a scraper knife leading-out second working connection, a front bulldozing second working connection and a rear soil loosening second working connection.
As a further improvement of the utility model, the first working valve rod is used as a reversing valve rod of a four-position seven-way reversing valve, and the second working valve rod is used as a reversing valve rod of a three-position seven-way reversing valve.
As a further improvement of the present invention, a first hydraulic lock is disposed on the first valve block, the first hydraulic lock includes two first driving pistons and two first locking check valves, each first driving piston is disposed corresponding to one first locking check valve, the first working valve stem oil outlet and/or the first pressure compensator oil outlet are connected to the first hydraulic lock, and the pressure oil at the first working valve stem oil outlet and/or the first pressure compensator oil outlet opens the first locking check valves through the first driving pistons.
As a further improvement of the utility model, the pressure oil at the oil outlet of the first working valve rod drives the first driving pistons to move in the same direction to open the first locking one-way valve, and the pressure oil at the oil outlet of the first pressure compensator drives the two first driving pistons to move in opposite directions to open the first locking one-way valve.
As a further improvement of the utility model, a second hydraulic lock is arranged on the first valve block, the second hydraulic lock comprises a second driving piston and two second locking one-way valves, an oil outlet of the second working valve rod is connected with the second hydraulic lock, and the second locking one-way valves are opened by pressure oil at the oil outlet through the second driving piston.
As a further improvement of the utility model, the first working valve rod is provided with a throttling groove.
As a further improvement of the utility model, a first overflow valve, an Ls overflow valve and a constant flow valve are arranged on the second valve block, the first overflow valve is arranged between the main oil inlet and the oil return port, and the Ls overflow valve and the constant flow valve are arranged between the feedback oil port and the oil return port in parallel.
The utility model has the advantages that the integrally cast multi-way valve can effectively eliminate oil leakage among the pieces, has small pressure loss and higher operation efficiency, adopts a mode of pressure compensation behind the valve to ensure that the system is more energy-saving, a plurality of execution structures act simultaneously, the flow is irrelevant to the load, each working valve rod can independently set the flow, and the fine adjustment and control performance is good. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic view of the structure of A-A in FIG. 1.
FIG. 3 is a schematic view of the structure of B-B in FIG. 1.
Fig. 4 is a hydraulic schematic of an embodiment of the present invention.
Fig. 5 is an enlarged view at I of fig. 4.
Fig. 6 is a hydraulic schematic diagram of an embodiment of the present invention.
In the figure, 1, a first valve block; 2. a second valve block; 3. a first working union; 31. a first working valve stem; 311. a throttling groove; 32. a first working oil port; 33. a first pressure compensator; 34. a first working unit; 35. a first hydraulic lock; 351. a first drive piston; 352. a first locking one-way valve; 4. a second working union; 41. a second working valve stem; 42. a second working oil port; 43. a second pressure compensator; 44. a second working unit; 45. a second hydraulic lock; 451. a second drive piston; 452. a second locking one-way valve; 5. a first overflow valve; 6. ls overflow valve; 7. a constant flow valve; p, a main oil inlet; t, an oil return port; LS and a feedback oil port.
Detailed Description
The embodiments of the utility model will be further described with reference to the accompanying drawings in which:
referring to fig. 1 and fig. 2-6, a load-sensitive multi-way valve for land leveller comprises a first valve block 1, a second valve block 2, a main oil inlet P, an oil return port T and a feedback oil port Ls, wherein the first valve block is provided with a first working connection group 3 and a second working connection group 4, the first working connection group comprises a first working valve rod 31, a first working oil port 32 and a first pressure compensator 33, the second working connection group comprises a second working valve rod 41, a second working oil port 42 and a second pressure compensator 43, pressure oil at the main oil inlet is respectively connected with oil inlets of the first working valve rod and the second working valve rod, an oil outlet of the first working valve rod is respectively connected with the first working oil port and the feedback oil port through the first pressure compensator, and an oil outlet of the second working valve rod is respectively connected with the second working oil port and the feedback oil port through the second pressure compensator, The feedback oil ports are connected, and the first working connection group and the second working connection group are integrally formed through casting. The utility model has the advantages that the integrally cast multi-way valve can effectively eliminate oil leakage among the pieces, has small pressure loss and higher operation efficiency, adopts a mode of pressure compensation behind the valve to ensure that the system is more energy-saving, a plurality of execution structures act simultaneously, the flow is irrelevant to the load, each working valve rod can independently set the flow, and the fine adjustment and control performance is good. The utility model also has the advantages of high integration degree, energy conservation, high efficiency, reliable operation, simple structure, convenient assembly, long service life and the like. The maximum flow of the utility model can reach 150L/min, and the maximum pressure can reach 35 Mpa.
The first work union coupling comprises two first work union couplings 34, and the two first work union couplings are arranged on two sides of the second work union coupling. Specifically, the second working group includes at least five second working groups 44. Specifically, the second working connection group comprises a front wheel inclined second working connection, a hinged steering second working connection, a scraper blade swinging second working connection, a motor rotating second working connection, a scraper blade angle changing second working connection, a scraper blade leading-out second working connection, a front bulldozing second working connection and a rear soil loosening second working connection. The first working joint is arranged on the left side and the right side of the second working joint and used for left lifting and right lifting, namely the 10-joint integrally cast multi-way valve can meet the accurate control of 10 actions of left/right lifting of a land leveler, leading out of a scraper blade, inclining of a front wheel, changing of a scraper soil angle, front soil pushing, rear soil loosening, hinged steering, swinging of the scraper blade and rotation of a motor. More specifically, the first working valve rod is used as a reversing valve rod of a four-position seven-way reversing valve, and the second working valve rod is used as a reversing valve rod of a three-position seven-way reversing valve. The integrally cast multi-way valve can effectively eliminate oil leakage between the pieces, and has small pressure loss and higher operation efficiency.
The first valve block is provided with a first hydraulic lock 35, the first hydraulic lock comprises two first driving pistons 351 and two first locking one-way valves 352, each first driving piston corresponds to one first locking one-way valve, the oil outlet of the first working valve rod and/or the oil outlet of the first pressure compensator are/is connected with the first hydraulic lock, and the pressure oil at the position opens the first locking one-way valves through the first driving pistons. Specifically, the pressure oil at the oil outlet of the first working valve rod drives the first driving pistons to move in the same direction to open the first locking one-way valve, and the pressure oil at the oil outlet of the first pressure compensator drives the two first driving pistons to move in opposite directions to open the first locking one-way valve. The structure ensures that the first working unit (the left lifting unit and the right lifting unit) has a floating position, and the free floating function of the cutting blade of the land scraper can be realized. The floating function is that the handle of the first working joint is pulled to a floating position, the large cavity and the small cavity of the oil cylinder are directly communicated with the oil tank, the scraper knife working device is tightly attached to the ground under the action of self gravity, and the scraper knife can realize free floating.
The first valve block is provided with a second hydraulic lock 45, the second hydraulic lock comprises a second driving piston 451 and two second locking one-way valves 452, an oil outlet of the second working valve rod is connected with the second hydraulic lock, and pressure oil at the oil outlet of the second working valve rod opens the second locking one-way valves through the second driving piston. Each working unit is internally provided with a bidirectional hydraulic lock, and each working unit is not required to be separately externally provided with a bidirectional hydraulic lock or a balance valve, so that the pipeline connection is simplified, the cost is saved, and the operation is reliable.
The first working valve rod is provided with a throttling groove 311. The design of the throttling groove provides certain oil return back pressure, and the lifting oil cylinder is prevented from falling and shaking.
The second valve block on be equipped with first overflow valve 5, Ls overflow valve 6 and constant flow valve 7, first overflow valve locate between main oil inlet and the oil return opening, Ls overflow valve and the parallelly connected setting of constant flow valve between feedback hydraulic fluid port and oil return opening. The structure enables the system to be higher in safety, and meanwhile, oil can be distributed more accurately through the feedback oil port.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concepts are not limited to the embodiments, and any modifications that utilize the inventive concepts are intended to be included within the scope of the appended claims.
Claims (10)
1. A load-sensitive multi-way valve for a land leveler comprises a first valve block, a second valve block, a main oil inlet, an oil return port and a feedback oil port, the method is characterized in that: the first valve block is provided with a first working connection group and a second working connection group, the first working connection group comprises a first working valve rod, a first working oil port and a first pressure compensator, the second working union set comprises a second working valve rod, a second working oil port and a second pressure compensator, the pressure oil of the main oil inlet is respectively connected with the oil inlets of the first working valve rod and the second working valve rod, the oil outlet of the first working valve rod is respectively connected with the first working oil port and the feedback oil port through a first pressure compensator, the oil outlet of the second working valve rod is respectively connected with a second working oil port and a feedback oil port through a second pressure compensator, and the first working connection group and the second working connection group are integrally formed through casting.
2. The load sensitive multiplex valve for a grader as in claim 1 wherein said first plurality of operational banks includes two first operational banks, said two first operational banks being disposed on opposite sides of said second plurality of operational banks.
3. The load sensitive multiplex valve for a grader as in claim 2 wherein said second plurality of operational banks includes at least five second operational banks.
4. The load-sensitive multi-way valve for land levelers as claimed in claim 2, wherein the second working link group comprises a front wheel tilting second working link, a hinged steering second working link, a blade swinging second working link, a motor rotating second working link, a blade angle changing second working link, a blade leading-out second working link, a front dozing second working link and a rear soil loosening second working link.
5. The load sensitive multiplex valve for a grader as in claim 1 wherein the first operating valve stem is a diverter valve stem for use as a four-position seven-way diverter valve and the second operating valve stem is a diverter valve stem for use as a three-position seven-way diverter valve.
6. The load-sensitive multi-way valve for the land leveller as claimed in claim 1, wherein the first valve block is provided with a first hydraulic lock, the first hydraulic lock comprises two first driving pistons and two first locking one-way valves, each first driving piston is arranged corresponding to one first locking one-way valve, the first working valve rod oil outlet and/or the first pressure compensator oil outlet are/is connected with the first hydraulic lock, and the pressure oil at the first working valve rod oil outlet and/or the first pressure compensator oil outlet opens the first locking one-way valve through the first driving piston.
7. The load-sensitive multi-way valve for the land leveller as recited in claim 6, wherein the pressure oil at the oil outlet of the first working valve stem drives the first driving pistons to move in the same direction to open the first locking one-way valve, and the pressure oil at the oil outlet of the first pressure compensator drives the two first driving pistons to move in opposite directions to open the first locking one-way valve.
8. The load-sensitive multi-way valve for the land leveller as recited in claim 1, wherein the first valve block is provided with a second hydraulic lock, the second hydraulic lock comprises a second driving piston and two second locking one-way valves, the oil outlet of the second working valve stem is connected with the second hydraulic lock, and the pressure oil at the oil outlet of the second working valve stem opens the second locking one-way valves through the second driving piston.
9. The load sensitive multiplex valve for a grader as in claim 1 wherein the first working valve stem is provided with a throttling groove.
10. The load-sensitive multi-way valve for the land leveler as recited in claim 1, wherein the second valve block is provided with a first overflow valve, an Ls overflow valve and a constant flow valve, the first overflow valve is arranged between the main oil inlet and the oil return port, and the Ls overflow valve and the constant flow valve are arranged between the feedback oil port and the oil return port in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121966438.7U CN215890646U (en) | 2021-08-20 | 2021-08-20 | Load-sensitive multi-way valve for land leveller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121966438.7U CN215890646U (en) | 2021-08-20 | 2021-08-20 | Load-sensitive multi-way valve for land leveller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215890646U true CN215890646U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121966438.7U Active CN215890646U (en) | 2021-08-20 | 2021-08-20 | Load-sensitive multi-way valve for land leveller |
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| Country | Link |
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| CN (1) | CN215890646U (en) |
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2021
- 2021-08-20 CN CN202121966438.7U patent/CN215890646U/en active Active
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